Combine price feed transformers

- fetches logs from all three price feeds in one query
- assumes eth/usd price feed will be updated to include LogValue event
- updates transformers to run separate from header sync

README.md

@@ -29,8 +29,7 @@ Vulcanize DB is a set of tools that make it easier for developers to write appli
 
 ## Configuration
 - To use a local Ethereum node, copy `environments/public.toml.example` to
-  `environments/public.toml` and update the `ipcPath`, `levelDbPath`, 
+  `environments/public.toml` and update the `ipcPath` and `levelDbPath`.
-  `pipContractAddress`, `pepContractAddress`, and `repContractAddress`.
   - `ipcPath` should match the local node's IPC filepath:
       - when using geth:
         - The IPC file is called `geth.ipc`.
@@ -52,10 +51,7 @@ Vulcanize DB is a set of tools that make it easier for developers to write appli
           - Linux: `$HOME/.ethereum/geth/chaindata`
       - `levelDbPath` is irrelevant (and `coldImport` is currently unavailable) if only running parity.
 
-  - `pepContractAddress`, `pipContractAddress`, and `repContractAddress` should match that medianizer
+- See `environments/infura.toml` to configure commands to run against infura, if a local node is unavailable.
-     addresses for each pair on the chain you're tracking. See https://makerdao.com/feeds/
-     
-- See `environments/infura.toml` to configure commands to run against infura, if a local node is unavailable
 - Copy `environments/local.toml.example` to `environments/local.toml` to configure commands to run against a local node such as [Ganache](https://truffleframework.com/ganache) or [ganache-cli](https://github.com/trufflesuite/ganache-clihttps://github.com/trufflesuite/ganache-cli).
 
 ## Start syncing with postgres
@@ -82,22 +78,17 @@ This command is useful when you want a minimal baseline from which to track targ
 1. In a separate terminal start VulcanizeDB:
     - `./vulcanizedb lightSync --config <config.toml> --starting-block-number <block-number>`
 
-## Backfill Auction event logs from light sync
+## Backfill Maker event logs from light sync
-Backfills auction event logs from the configured Ethereum node based on the populated block headers.
+Backfills Maker event logs from the configured Ethereum node based on the populated block headers.
+This includes logs related to auctions, multi-collateral dai, and price feeds.
 This command requires that a light sync (see command above) has previously been run.
 
-_Since auction contracts have not yet been deployed, this command will need to be run a local blockchain at the moment. As such, a new environment file will need to be added. See `environments/local.toml.example`._
+_Since auction/mcd contracts have not yet been deployed, this command will need to be run a local blockchain at the moment. As such, a new environment file will need to be added. See `environments/local.toml.example`._
 
 1. Start Ethereum node
 1. In a separate terminal run the backfill command:
-  - `./vulcanizedb backfillAuctionLogs --config <config.toml>`
+  - `./vulcanizedb backfillMakerLogs --config <config.toml>`
   
-## Sync in light mode with MakerDAO price feeds
-Sync VulcanizeDB with the configured Ethereum node, populating block headers as well as price feeds for MKR/USD, ETH/USD, and REP/USD.
-1. Start Ethereum node
-1. In a separate terminal window start VulcanizeDB
-    - `./vulcanizedb syncPriceFeeds --config <config.toml> --starting-block-number <block-number>`
-
 ## Start full environment in docker by single command
 
 ### Geth Rinkeby

cmd/backfillMakerLogs.go

@@ -35,7 +35,8 @@ var backfillMakerLogsCmd = &cobra.Command{
 	Use:   "backfillMakerLogs",
 	Short: "Backfill Maker event logs",
 	Long: `Backfills Maker event logs based on previously populated block Header records.
-This currently includes logs related to Multi-collateral Dai (frob) and Auctions (flip-kick).
+This currently includes logs related to Multi-collateral Dai (frob), Auctions (flip-kick),
+and Price Feeds (ETH/USD, MKR/USD, and REP/USD - LogValue).
 
 vulcanize backfillMakerLogs --config environments/local.toml
 

cmd/lightSync.go

@@ -31,7 +31,6 @@ import (
 	vRpc "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
 	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
 	"github.com/vulcanize/vulcanizedb/utils"
 )
 
@@ -65,8 +64,7 @@ func init() {
 }
 
 func backFillAllHeaders(blockchain core.BlockChain, headerRepository datastore.HeaderRepository, missingBlocksPopulated chan int, startingBlockNumber int64) {
-	emptyTransformers := []transformers.Transformer{}
+	populated, err := history.PopulateMissingHeaders(blockchain, headerRepository, startingBlockNumber)
-	populated, err := history.PopulateMissingHeaders(blockchain, headerRepository, startingBlockNumber, emptyTransformers)
 	if err != nil {
 		log.Fatal("Error populating headers: ", err)
 	}
@@ -81,7 +79,7 @@ func lightSync() {
 	db := utils.LoadPostgres(databaseConfig, blockChain.Node())
 
 	headerRepository := repositories.NewHeaderRepository(&db)
-	validator := history.NewHeaderValidator(blockChain, headerRepository, validationWindow, []transformers.Transformer{})
+	validator := history.NewHeaderValidator(blockChain, headerRepository, validationWindow)
 	missingBlocksPopulated := make(chan int)
 	go backFillAllHeaders(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber)
 

cmd/root.go

@@ -29,9 +29,6 @@ var (
 	databaseConfig      config.Database
 	ipc                 string
 	levelDbPath         string
-	pepContractAddress  string
-	pipContractAddress  string
-	repContractAddress  string
 	startingBlockNumber int64
 	syncAll             bool
 	endingBlockNumber   int64
@@ -52,9 +49,6 @@ func Execute() {
 func database(cmd *cobra.Command, args []string) {
 	ipc = viper.GetString("client.ipcpath")
 	levelDbPath = viper.GetString("client.leveldbpath")
-	pepContractAddress = viper.GetString("client.pepcontractaddress")
-	pipContractAddress = viper.GetString("client.pipcontractaddress")
-	repContractAddress = viper.GetString("client.repcontractaddress")
 	databaseConfig = config.Database{
 		Name:     viper.GetString("database.name"),
 		Hostname: viper.GetString("database.hostname"),
@@ -76,9 +70,6 @@ func init() {
 	rootCmd.PersistentFlags().String("database-password", "", "database password")
 	rootCmd.PersistentFlags().String("client-ipcPath", "", "location of geth.ipc file")
 	rootCmd.PersistentFlags().String("client-levelDbPath", "", "location of levelDb chaindata")
-	rootCmd.PersistentFlags().String("client-pepContractAddress", "", "mkr/usd price feed contract address")
-	rootCmd.PersistentFlags().String("client-pipContractAddress", "", "eth/usd price feed contract address")
-	rootCmd.PersistentFlags().String("client-repContractAddress", "", "rep/usd price feed contract address")
 
 	viper.BindPFlag("database.name", rootCmd.PersistentFlags().Lookup("database-name"))
 	viper.BindPFlag("database.port", rootCmd.PersistentFlags().Lookup("database-port"))
@@ -87,9 +78,6 @@ func init() {
 	viper.BindPFlag("database.password", rootCmd.PersistentFlags().Lookup("database-password"))
 	viper.BindPFlag("client.ipcPath", rootCmd.PersistentFlags().Lookup("client-ipcPath"))
 	viper.BindPFlag("client.levelDbPath", rootCmd.PersistentFlags().Lookup("client-levelDbPath"))
-	viper.BindPFlag("client.pepContractAddress", rootCmd.PersistentFlags().Lookup("client-pepContractAddress"))
-	viper.BindPFlag("client.pipContractAddress", rootCmd.PersistentFlags().Lookup("client-pipContractAddress"))
-	viper.BindPFlag("client.repContractAddress", rootCmd.PersistentFlags().Lookup("client-repContractAddress"))
 }
 
 func initConfig() {

cmd/syncPriceFeeds.go

@@ -1,88 +0,0 @@
-// Copyright © 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package cmd
-
-import (
-	"log"
-	"os"
-	"time"
-
-	"github.com/spf13/cobra"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/history"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pep"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pip"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/rep"
-	"github.com/vulcanize/vulcanizedb/utils"
-)
-
-// syncPriceFeedsCmd represents the syncPriceFeeds command
-var syncPriceFeedsCmd = &cobra.Command{
-	Use:   "syncPriceFeeds",
-	Short: "Sync block headers with price feed data",
-	Long: `Sync Ethereum block headers and price feed data. For example:
-
-./vulcanizedb syncPriceFeeds --config <config.toml> --starting-block-number <block-number>
-
-Price feed data will be updated when price feed contracts log value events.`,
-	Run: func(cmd *cobra.Command, args []string) {
-		syncPriceFeeds()
-	},
-}
-
-func init() {
-	rootCmd.AddCommand(syncPriceFeedsCmd)
-	syncPriceFeedsCmd.Flags().Int64VarP(&startingBlockNumber, "starting-block-number", "s", 0, "block number at which to start tracking price feeds")
-}
-
-func backFillPriceFeeds(blockchain core.BlockChain, headerRepository datastore.HeaderRepository, missingBlocksPopulated chan int, startingBlockNumber int64, transformers []transformers.Transformer) {
-	populated, err := history.PopulateMissingHeaders(blockchain, headerRepository, startingBlockNumber, transformers)
-	if err != nil {
-		log.Fatal("Error populating headers: ", err)
-	}
-	missingBlocksPopulated <- populated
-}
-
-func syncPriceFeeds() {
-	ticker := time.NewTicker(pollingInterval)
-	defer ticker.Stop()
-	blockChain := getBlockChain()
-	validateArgs(blockChain)
-	db := utils.LoadPostgres(databaseConfig, blockChain.Node())
-
-	transformers := []transformers.Transformer{
-		pep.NewPepTransformer(blockChain, &db, pepContractAddress),
-		pip.NewPipTransformer(blockChain, &db, pipContractAddress),
-		rep.NewRepTransformer(blockChain, &db, repContractAddress),
-	}
-	headerRepository := repositories.NewHeaderRepository(&db)
-	missingBlocksPopulated := make(chan int)
-	validator := history.NewHeaderValidator(blockChain, headerRepository, validationWindow, transformers)
-	go backFillPriceFeeds(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber, transformers)
-
-	for {
-		select {
-		case <-ticker.C:
-			window := validator.ValidateHeaders()
-			window.Log(os.Stdout)
-		case <-missingBlocksPopulated:
-			go backFillPriceFeeds(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber, transformers)
-		}
-	}
-}

db/migrations/1532533671_create_peps_table.down.sql

@@ -1,2 +0,0 @@
-DROP TABLE maker.peps;
-DROP SCHEMA maker;

db/migrations/1532533671_create_peps_table.up.sql

@@ -1,9 +0,0 @@
-CREATE TABLE maker.peps (
-  id           SERIAL PRIMARY KEY,
-  block_number BIGINT  NOT NULL,
-  header_id    INTEGER NOT NULL,
-  usd_value    NUMERIC,
-  CONSTRAINT headers_fk FOREIGN KEY (header_id)
-  REFERENCES headers (id)
-  ON DELETE CASCADE
-);

db/migrations/1532623709_create_pips_table.down.sql

@@ -1 +0,0 @@
-DROP TABLE maker.pips;

db/migrations/1532623709_create_pips_table.up.sql

@@ -1,9 +0,0 @@
-CREATE TABLE maker.pips (
-  id           SERIAL PRIMARY KEY,
-  block_number BIGINT  NOT NULL,
-  header_id    INTEGER NOT NULL,
-  usd_value    NUMERIC,
-  CONSTRAINT headers_fk FOREIGN KEY (header_id)
-  REFERENCES headers (id)
-  ON DELETE CASCADE
-);

db/migrations/1532635100_create_reps_table.down.sql

@@ -1 +0,0 @@
-DROP TABLE maker.reps;

db/migrations/1532635100_create_reps_table.up.sql

@@ -1,9 +0,0 @@
-CREATE TABLE maker.reps (
-  id           SERIAL PRIMARY KEY,
-  block_number BIGINT  NOT NULL,
-  header_id    INTEGER NOT NULL,
-  usd_value    NUMERIC,
-  CONSTRAINT headers_fk FOREIGN KEY (header_id)
-  REFERENCES headers (id)
-  ON DELETE CASCADE
-);

db/migrations/1534275305_create_price_feeds_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE maker.price_feeds;

db/migrations/1534275305_create_price_feeds_table.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE maker.price_feeds (
+  id                  SERIAL PRIMARY KEY,
+  block_number        BIGINT  NOT NULL,
+  header_id           INTEGER NOT NULL,
+  medianizer_address  bytea,
+  tx_idx              INTEGER NOT NULL,
+  usd_value           NUMERIC,
+  UNIQUE (header_id, medianizer_address, tx_idx),
+  CONSTRAINT headers_fk FOREIGN KEY (header_id)
+  REFERENCES headers (id)
+  ON DELETE CASCADE
+);

db/schema.sql

@@ -120,22 +120,24 @@ ALTER SEQUENCE maker.frob_id_seq OWNED BY maker.frob.id;
 
 
 --
--- Name: peps; Type: TABLE; Schema: maker; Owner: -
+-- Name: price_feeds; Type: TABLE; Schema: maker; Owner: -
 --
 
-CREATE TABLE maker.peps (
+CREATE TABLE maker.price_feeds (
     id integer NOT NULL,
     block_number bigint NOT NULL,
     header_id integer NOT NULL,
+    medianizer_address bytea,
+    tx_idx integer NOT NULL,
     usd_value numeric
 );
 
 
 --
--- Name: peps_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
+-- Name: price_feeds_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
 --
 
-CREATE SEQUENCE maker.peps_id_seq
+CREATE SEQUENCE maker.price_feeds_id_seq
     AS integer
     START WITH 1
     INCREMENT BY 1
@@ -145,74 +147,10 @@ CREATE SEQUENCE maker.peps_id_seq
 
 
 --
--- Name: peps_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
+-- Name: price_feeds_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
 --
 
-ALTER SEQUENCE maker.peps_id_seq OWNED BY maker.peps.id;
+ALTER SEQUENCE maker.price_feeds_id_seq OWNED BY maker.price_feeds.id;
-
-
---
--- Name: pips; Type: TABLE; Schema: maker; Owner: -
---
-
-CREATE TABLE maker.pips (
-    id integer NOT NULL,
-    block_number bigint NOT NULL,
-    header_id integer NOT NULL,
-    usd_value numeric
-);
-
-
---
--- Name: pips_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
---
-
-CREATE SEQUENCE maker.pips_id_seq
-    AS integer
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-
---
--- Name: pips_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
---
-
-ALTER SEQUENCE maker.pips_id_seq OWNED BY maker.pips.id;
-
-
---
--- Name: reps; Type: TABLE; Schema: maker; Owner: -
---
-
-CREATE TABLE maker.reps (
-    id integer NOT NULL,
-    block_number bigint NOT NULL,
-    header_id integer NOT NULL,
-    usd_value numeric
-);
-
-
---
--- Name: reps_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
---
-
-CREATE SEQUENCE maker.reps_id_seq
-    AS integer
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-
---
--- Name: reps_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
---
-
-ALTER SEQUENCE maker.reps_id_seq OWNED BY maker.reps.id;
 
 
 --
@@ -602,24 +540,10 @@ ALTER TABLE ONLY maker.frob ALTER COLUMN id SET DEFAULT nextval('maker.frob_id_s
 
 
 --
--- Name: peps id; Type: DEFAULT; Schema: maker; Owner: -
+-- Name: price_feeds id; Type: DEFAULT; Schema: maker; Owner: -
 --
 
-ALTER TABLE ONLY maker.peps ALTER COLUMN id SET DEFAULT nextval('maker.peps_id_seq'::regclass);
+ALTER TABLE ONLY maker.price_feeds ALTER COLUMN id SET DEFAULT nextval('maker.price_feeds_id_seq'::regclass);
-
-
---
--- Name: pips id; Type: DEFAULT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.pips ALTER COLUMN id SET DEFAULT nextval('maker.pips_id_seq'::regclass);
-
-
---
--- Name: reps id; Type: DEFAULT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.reps ALTER COLUMN id SET DEFAULT nextval('maker.reps_id_seq'::regclass);
 
 
 --
@@ -718,27 +642,19 @@ ALTER TABLE ONLY maker.frob
 
 
 --
--- Name: peps peps_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
+-- Name: price_feeds price_feeds_header_id_medianizer_address_tx_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
 --
 
-ALTER TABLE ONLY maker.peps
+ALTER TABLE ONLY maker.price_feeds
-    ADD CONSTRAINT peps_pkey PRIMARY KEY (id);
+    ADD CONSTRAINT price_feeds_header_id_medianizer_address_tx_idx_key UNIQUE (header_id, medianizer_address, tx_idx);
 
 
 --
--- Name: pips pips_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
+-- Name: price_feeds price_feeds_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
 --
 
-ALTER TABLE ONLY maker.pips
+ALTER TABLE ONLY maker.price_feeds
-    ADD CONSTRAINT pips_pkey PRIMARY KEY (id);
+    ADD CONSTRAINT price_feeds_pkey PRIMARY KEY (id);
-
-
---
--- Name: reps reps_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.reps
-    ADD CONSTRAINT reps_pkey PRIMARY KEY (id);
 
 
 --
@@ -889,26 +805,10 @@ ALTER TABLE ONLY maker.frob
 
 
 --
--- Name: peps headers_fk; Type: FK CONSTRAINT; Schema: maker; Owner: -
+-- Name: price_feeds headers_fk; Type: FK CONSTRAINT; Schema: maker; Owner: -
 --
 
-ALTER TABLE ONLY maker.peps
+ALTER TABLE ONLY maker.price_feeds
-    ADD CONSTRAINT headers_fk FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
-
-
---
--- Name: pips headers_fk; Type: FK CONSTRAINT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.pips
-    ADD CONSTRAINT headers_fk FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
-
-
---
--- Name: reps headers_fk; Type: FK CONSTRAINT; Schema: maker; Owner: -
---
-
-ALTER TABLE ONLY maker.reps
     ADD CONSTRAINT headers_fk FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
 
 

environments/infura.toml

@@ -1,10 +1,7 @@
 [database]
-name = "vulcanize_public"
+name = "vulcanize_private"
 hostname = "localhost"
 port = 5432
 
 [client]
 ipcPath = "https://mainnet.infura.io/J5Vd2fRtGsw0zZ0Ov3BL"
-pepContractAddress = "0x99041F808D598B782D5a3e498681C2452A31da08"
-pipContractAddress = "0x729D19f657BD0614b4985Cf1D82531c67569197B"
-repContractAddress = "0xF5f94b7F9De14D43112e713835BCef2d55b76c1C"

environments/private.toml

@@ -5,6 +5,3 @@ port = 5432
 
 [client]
 ipcPath = "http://127.0.0.1:7545"
-pepContractAddress = "0x99041F808D598B782D5a3e498681C2452A31da08"
-pipContractAddress = "0x729D19f657BD0614b4985Cf1D82531c67569197B"
-repContractAddress = "0xF5f94b7F9De14D43112e713835BCef2d55b76c1C"

environments/public.toml.example

@@ -6,6 +6,3 @@ port = 5432
 [client]
 ipcPath = <local node's IPC filepath>
 levelDbPath = <local node's LevelDB chaindata filepath>
-pepContractAddress = <pep medianizer's address - see https://makerdao.com/feeds/ >
-pipContractAddress = <pip medianizer's address - see https://makerdao.com/feeds/ >
-repContractAddress = <rep medianizer's address - see https://makerdao.com/feeds/ >

pkg/datastore/postgres/repositories/header_repository.go

@@ -3,6 +3,7 @@ package repositories
 import (
 	"database/sql"
 	"errors"
+
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )

pkg/fakes/mock_transformer.go

@@ -1,44 +0,0 @@
-package fakes
-
-import (
-	. "github.com/onsi/gomega"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-)
-
-type MockTransformer struct {
-	passedHeader   core.Header
-	passedHeaderID int64
-	executeCalled  bool
-	executeErr     error
-}
-
-func NewMockTransformer() *MockTransformer {
-	return &MockTransformer{
-		passedHeader:   core.Header{},
-		passedHeaderID: 0,
-		executeCalled:  false,
-		executeErr:     nil,
-	}
-}
-
-func (transformer *MockTransformer) SetExecuteErr(err error) {
-	transformer.executeErr = err
-}
-
-func (transformer *MockTransformer) Execute(header core.Header, headerID int64) error {
-	transformer.executeCalled = true
-	transformer.passedHeader = header
-	transformer.passedHeaderID = headerID
-	return transformer.executeErr
-}
-
-func (transformer *MockTransformer) AssertExecuteCalledWith(header core.Header, headerID int64) {
-	Expect(transformer.executeCalled).To(BeTrue())
-	Expect(header).To(Equal(transformer.passedHeader))
-	Expect(headerID).To(Equal(transformer.passedHeaderID))
-}
-
-func (tranformer *MockTransformer) AssertExecuteNotCalled() {
-	Expect(tranformer.executeCalled).To(BeFalse())
-}

pkg/history/header_validator.go

@@ -3,28 +3,25 @@ package history
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
 )
 
 type HeaderValidator struct {
 	blockChain       core.BlockChain
 	headerRepository datastore.HeaderRepository
 	windowSize       int
-	transformers     []transformers.Transformer
 }
 
-func NewHeaderValidator(blockChain core.BlockChain, repository datastore.HeaderRepository, windowSize int, transformers []transformers.Transformer) HeaderValidator {
+func NewHeaderValidator(blockChain core.BlockChain, repository datastore.HeaderRepository, windowSize int) HeaderValidator {
 	return HeaderValidator{
 		blockChain:       blockChain,
 		headerRepository: repository,
 		windowSize:       windowSize,
-		transformers:     transformers,
 	}
 }
 
 func (validator HeaderValidator) ValidateHeaders() ValidationWindow {
 	window := MakeValidationWindow(validator.blockChain, validator.windowSize)
 	blockNumbers := MakeRange(window.LowerBound, window.UpperBound)
-	RetrieveAndUpdateHeaders(validator.blockChain, validator.headerRepository, blockNumbers, validator.transformers)
+	RetrieveAndUpdateHeaders(validator.blockChain, validator.headerRepository, blockNumbers)
 	return window
 }

pkg/history/header_validator_test.go

@@ -2,10 +2,8 @@ package history_test
 
 import (
 	. "github.com/onsi/ginkgo"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
 	"math/big"
 )
 
@@ -15,24 +13,10 @@ var _ = Describe("Header validator", func() {
 		headerRepository.SetMissingBlockNumbers([]int64{})
 		blockChain := fakes.NewMockBlockChain()
 		blockChain.SetLastBlock(big.NewInt(3))
-		validator := history.NewHeaderValidator(blockChain, headerRepository, 2, []transformers.Transformer{})
+		validator := history.NewHeaderValidator(blockChain, headerRepository, 2)
 
 		validator.ValidateHeaders()
 
 		headerRepository.AssertCreateOrUpdateHeaderCallCountAndPassedBlockNumbers(3, []int64{1, 2, 3})
 	})
-
-	It("passes transformers for execution on new blocks", func() {
-		headerRepository := fakes.NewMockHeaderRepository()
-		headerRepository.SetMissingBlockNumbers([]int64{})
-		blockChain := fakes.NewMockBlockChain()
-		blockChain.SetLastBlock(big.NewInt(3))
-		transformer := fakes.NewMockTransformer()
-		validator := history.NewHeaderValidator(blockChain, headerRepository, 1, []transformers.Transformer{transformer})
-
-		validator.ValidateHeaders()
-
-		headerRepository.AssertCreateOrUpdateHeaderCallCountAndPassedBlockNumbers(2, []int64{2, 3})
-		transformer.AssertExecuteCalledWith(core.Header{BlockNumber: 3}, 0)
-	})
 })

pkg/history/populate_headers.go

@@ -6,40 +6,33 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
 )
 
-func PopulateMissingHeaders(blockchain core.BlockChain, headerRepository datastore.HeaderRepository, startingBlockNumber int64, transformers []transformers.Transformer) (int, error) {
+func PopulateMissingHeaders(blockchain core.BlockChain, headerRepository datastore.HeaderRepository, startingBlockNumber int64) (int, error) {
 	lastBlock := blockchain.LastBlock().Int64()
 	blockRange := headerRepository.MissingBlockNumbers(startingBlockNumber, lastBlock, blockchain.Node().ID)
 	log.SetPrefix("")
 	log.Printf("Backfilling %d blocks\n\n", len(blockRange))
-	_, err := RetrieveAndUpdateHeaders(blockchain, headerRepository, blockRange, transformers)
+	_, err := RetrieveAndUpdateHeaders(blockchain, headerRepository, blockRange)
 	if err != nil {
 		return 0, err
 	}
 	return len(blockRange), nil
 }
 
-func RetrieveAndUpdateHeaders(chain core.BlockChain, headerRepository datastore.HeaderRepository, blockNumbers []int64, transformers []transformers.Transformer) (int, error) {
+func RetrieveAndUpdateHeaders(chain core.BlockChain, headerRepository datastore.HeaderRepository, blockNumbers []int64) (int, error) {
 	for _, blockNumber := range blockNumbers {
 		header, err := chain.GetHeaderByNumber(blockNumber)
 		if err != nil {
 			return 0, err
 		}
-		id, err := headerRepository.CreateOrUpdateHeader(header)
+		_, err = headerRepository.CreateOrUpdateHeader(header)
 		if err != nil {
 			if err == repositories.ErrValidHeaderExists {
 				continue
 			}
 			return 0, err
 		}
-		for _, transformer := range transformers {
-			err := transformer.Execute(header, id)
-			if err != nil {
-				return 0, err
-			}
-		}
 	}
 	return len(blockNumbers), nil
 }

pkg/history/populate_headers_test.go

@@ -6,11 +6,8 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers"
 )
 
 var _ = Describe("Populating headers", func() {
@@ -26,7 +23,7 @@ var _ = Describe("Populating headers", func() {
 		blockChain.SetLastBlock(big.NewInt(2))
 		headerRepository.SetMissingBlockNumbers([]int64{2})
 
-		headersAdded, err := history.PopulateMissingHeaders(blockChain, headerRepository, 1, []transformers.Transformer{})
+		headersAdded, err := history.PopulateMissingHeaders(blockChain, headerRepository, 1)
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(headersAdded).To(Equal(1))
@@ -37,54 +34,9 @@ var _ = Describe("Populating headers", func() {
 		blockChain.SetLastBlock(big.NewInt(2))
 		headerRepository.SetMissingBlockNumbers([]int64{2})
 
-		_, err := history.PopulateMissingHeaders(blockChain, headerRepository, 1, []transformers.Transformer{})
+		_, err := history.PopulateMissingHeaders(blockChain, headerRepository, 1)
 
 		Expect(err).NotTo(HaveOccurred())
 		headerRepository.AssertCreateOrUpdateHeaderCallCountAndPassedBlockNumbers(1, []int64{2})
 	})
-
-	It("executes passed transformers with created headers", func() {
-		blockNumber := int64(54321)
-		blockChain := fakes.NewMockBlockChain()
-		blockChain.SetLastBlock(big.NewInt(blockNumber))
-		headerRepository.SetMissingBlockNumbers([]int64{blockNumber})
-		headerID := int64(12345)
-		headerRepository.SetCreateOrUpdateHeaderReturnID(headerID)
-		transformer := fakes.NewMockTransformer()
-
-		_, err := history.PopulateMissingHeaders(blockChain, headerRepository, blockNumber, []transformers.Transformer{transformer})
-
-		Expect(err).NotTo(HaveOccurred())
-		transformer.AssertExecuteCalledWith(core.Header{BlockNumber: blockNumber}, headerID)
-	})
-
-	It("does not execute transformer if repository indicates header already exists", func() {
-		blockNumber := int64(54321)
-		blockChain := fakes.NewMockBlockChain()
-		blockChain.SetLastBlock(big.NewInt(blockNumber))
-		headerRepository.SetMissingBlockNumbers([]int64{blockNumber})
-		headerRepository.SetCreateOrUpdateHeaderReturnErr(repositories.ErrValidHeaderExists)
-		transformer := fakes.NewMockTransformer()
-
-		_, err := history.PopulateMissingHeaders(blockChain, headerRepository, blockNumber, []transformers.Transformer{transformer})
-
-		Expect(err).NotTo(HaveOccurred())
-		transformer.AssertExecuteNotCalled()
-	})
-
-	It("returns error if executing transformer fails", func() {
-		blockNumber := int64(54321)
-		blockChain := fakes.NewMockBlockChain()
-		blockChain.SetLastBlock(big.NewInt(blockNumber))
-		headerRepository.SetMissingBlockNumbers([]int64{blockNumber})
-		headerID := int64(12345)
-		headerRepository.SetCreateOrUpdateHeaderReturnID(headerID)
-		transformer := fakes.NewMockTransformer()
-		transformer.SetExecuteErr(fakes.FakeError)
-
-		_, err := history.PopulateMissingHeaders(blockChain, headerRepository, blockNumber, []transformers.Transformer{transformer})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(fakes.FakeError))
-	})
 })

pkg/transformers/flip_kick/config.go

@@ -14,16 +14,10 @@
 
 package flip_kick
 
-type TransformerConfig struct {
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-	ContractAddress     string
-	ContractAbi         string
-	Topics              []string
-	StartingBlockNumber int64
-	EndingBlockNumber   int64
-}
 
-var FlipKickConfig = TransformerConfig{
+var FlipKickConfig = shared.TransformerConfig{
-	ContractAddress:     "0x08cb6176addcca2e1d1ffe21bee464b72ee4cd8d", //this is a temporary address deployed locally
+	ContractAddresses:   "0x08cb6176addcca2e1d1ffe21bee464b72ee4cd8d", //this is a temporary address deployed locally
 	ContractAbi:         FlipperABI,
 	Topics:              []string{FlipKickSignature},
 	StartingBlockNumber: 0,

pkg/transformers/flip_kick/transformer.go

@@ -30,11 +30,11 @@ type FlipKickTransformer struct {
 	Fetcher    shared.LogFetcher
 	Converter  Converter
 	Repository Repository
-	Config     TransformerConfig
+	Config     shared.TransformerConfig
 }
 
 type FlipKickTransformerInitializer struct {
-	Config TransformerConfig
+	Config shared.TransformerConfig
 }
 
 func (i FlipKickTransformerInitializer) NewFlipKickTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
@@ -50,7 +50,7 @@ func (i FlipKickTransformerInitializer) NewFlipKickTransformer(db *postgres.DB,
 	return transformer
 }
 
-func (fkt *FlipKickTransformer) SetConfig(config TransformerConfig) {
+func (fkt *FlipKickTransformer) SetConfig(config shared.TransformerConfig) {
 	fkt.Config = config
 }
 
@@ -91,13 +91,13 @@ func (fkt FlipKickTransformer) Execute() error {
 	log.Printf("Fetching event logs for %d headers \n", len(headers))
 	var resultingErrors []error
 	for _, header := range headers {
-		ethLogs, err := fkt.Fetcher.FetchLogs(config.ContractAddress, topics, header.BlockNumber)
+		ethLogs, err := fkt.Fetcher.FetchLogs(config.ContractAddresses, topics, header.BlockNumber)
 		if err != nil {
 			resultingErrors = append(resultingErrors, newTransformerError(err, header.BlockNumber, FetcherError))
 		}
 
 		for _, ethLog := range ethLogs {
-			entity, err := fkt.Converter.ToEntity(config.ContractAddress, config.ContractAbi, ethLog)
+			entity, err := fkt.Converter.ToEntity(config.ContractAddresses, config.ContractAbi, ethLog)
 			if err != nil {
 				resultingErrors = append(resultingErrors, newTransformerError(err, header.BlockNumber, LogToEntityError))
 			}

pkg/transformers/flip_kick/transformer_test.go

@@ -25,6 +25,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flip_kick"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
 	flip_kick_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/flip_kick"
@@ -35,7 +36,7 @@ var _ = Describe("FlipKick Transformer", func() {
 	var fetcher mocks.MockLogFetcher
 	var converter flip_kick_mocks.MockFlipKickConverter
 	var repository flip_kick_mocks.MockFlipKickRepository
-	var testConfig flip_kick.TransformerConfig
+	var testConfig shared.TransformerConfig
 	var blockNumber int64
 	var headerId int64
 	var headers []core.Header
@@ -52,8 +53,8 @@ var _ = Describe("FlipKick Transformer", func() {
 		}
 
 		startingBlockNumber := rand.Int63()
-		testConfig = flip_kick.TransformerConfig{
+		testConfig = shared.TransformerConfig{
-			ContractAddress:     "0x12345",
+			ContractAddresses:   "0x12345",
 			ContractAbi:         "test abi",
 			Topics:              []string{flip_kick.FlipKickSignature},
 			StartingBlockNumber: startingBlockNumber,
@@ -82,7 +83,7 @@ var _ = Describe("FlipKick Transformer", func() {
 		err := transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 
-		Expect(fetcher.FetchedContractAddress).To(Equal(testConfig.ContractAddress))
+		Expect(fetcher.FetchedContractAddress).To(Equal(testConfig.ContractAddresses))
 		Expect(fetcher.FetchedTopics).To(Equal(expectedTopics))
 		Expect(fetcher.FetchedBlocks).To(Equal([]int64{blockNumber}))
 	})
@@ -99,7 +100,7 @@ var _ = Describe("FlipKick Transformer", func() {
 		err := transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 
-		Expect(converter.ConverterContract).To(Equal(testConfig.ContractAddress))
+		Expect(converter.ConverterContract).To(Equal(testConfig.ContractAddresses))
 		Expect(converter.ConverterAbi).To(Equal(testConfig.ContractAbi))
 		Expect(converter.LogsToConvert).To(Equal(logs))
 		Expect(converter.EntitiesToConvert).To(Equal([]flip_kick.FlipKickEntity{test_data.FlipKickEntity}))

pkg/transformers/frob/config.go

@@ -14,16 +14,10 @@
 
 package frob
 
-type TransformerConfig struct {
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-	ContractAddress     string
-	ContractAbi         string
-	Topics              []string
-	StartingBlockNumber int64
-	EndingBlockNumber   int64
-}
 
-var FrobConfig = TransformerConfig{
+var FrobConfig = shared.TransformerConfig{
-	ContractAddress:     "0xff3f2400f1600f3f493a9a92704a29b96795af1a", //this is a temporary address deployed locally
+	ContractAddresses:   "0xff3f2400f1600f3f493a9a92704a29b96795af1a", //this is a temporary address deployed locally
 	ContractAbi:         FrobABI,
 	Topics:              []string{FrobEventSignature},
 	StartingBlockNumber: 0,

pkg/transformers/frob/transformer.go

@@ -23,13 +23,14 @@ import (
 )
 
 type FrobTransformer struct {
+	Config     shared.TransformerConfig
 	Converter  Converter
 	Fetcher    shared.LogFetcher
 	Repository Repository
 }
 
 type FrobTransformerInitializer struct {
-	Config TransformerConfig
+	Config shared.TransformerConfig
 }
 
 func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
@@ -37,6 +38,7 @@ func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB
 	fetcher := shared.NewFetcher(blockChain)
 	repository := NewFrobRepository(db)
 	return FrobTransformer{
+		Config:     initializer.Config,
 		Converter:  converter,
 		Fetcher:    fetcher,
 		Repository: repository,
@@ -44,18 +46,18 @@ func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB
 }
 
 func (transformer FrobTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(FrobConfig.StartingBlockNumber, FrobConfig.EndingBlockNumber)
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
 	if err != nil {
 		return err
 	}
 	for _, header := range missingHeaders {
 		topics := [][]common.Hash{{common.HexToHash(FrobEventSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddress, topics, header.BlockNumber)
+		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddresses, topics, header.BlockNumber)
 		if err != nil {
 			return err
 		}
 		for _, log := range matchingLogs {
-			entity, err := transformer.Converter.ToEntity(FrobConfig.ContractAddress, FrobConfig.ContractAbi, log)
+			entity, err := transformer.Converter.ToEntity(FrobConfig.ContractAddresses, FrobConfig.ContractAbi, log)
 			if err != nil {
 				return err
 			}

pkg/transformers/frob/transformer_test.go

@@ -32,6 +32,7 @@ var _ = Describe("Frob transformer", func() {
 	It("gets missing headers for block numbers specified in config", func() {
 		repository := &frob_mocks.MockFrobRepository{}
 		transformer := frob.FrobTransformer{
+			Config:     frob.FrobConfig,
 			Fetcher:    &mocks.MockLogFetcher{},
 			Converter:  &frob_mocks.MockFrobConverter{},
 			Repository: repository,
@@ -73,7 +74,7 @@ var _ = Describe("Frob transformer", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddress).To(Equal(frob.FrobConfig.ContractAddress))
+		Expect(fetcher.FetchedContractAddress).To(Equal(frob.FrobConfig.ContractAddresses))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(frob.FrobEventSignature)}}))
 	})
 
@@ -109,7 +110,7 @@ var _ = Describe("Frob transformer", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.PassedContractAddress).To(Equal(frob.FrobConfig.ContractAddress))
+		Expect(converter.PassedContractAddress).To(Equal(frob.FrobConfig.ContractAddresses))
 		Expect(converter.PassedContractABI).To(Equal(frob.FrobConfig.ContractAbi))
 		Expect(converter.PassedLog).To(Equal(test_data.EthFrobLog))
 		Expect(converter.PassedEntity).To(Equal(test_data.FrobEntity))

pkg/transformers/price_feeds/config.go

@@ -0,0 +1,37 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds
+
+var (
+	PepAddress = "0x99041F808D598B782D5a3e498681C2452A31da08"
+	PipAddress = "0x729D19f657BD0614b4985Cf1D82531c67569197B"
+	RepAddress = "0xF5f94b7F9De14D43112e713835BCef2d55b76c1C"
+)
+
+type IPriceFeedConfig struct {
+	ContractAddresses   []string
+	StartingBlockNumber int64
+	EndingBlockNumber   int64
+}
+
+var PriceFeedConfig = IPriceFeedConfig{
+	ContractAddresses: []string{
+		PepAddress,
+		PipAddress,
+		RepAddress,
+	},
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   100,
+}

pkg/transformers/price_feeds/constants.go

@@ -1,3 +1,17 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package price_feeds
 
 import (
@@ -6,13 +20,9 @@ import (
 )
 
 var (
-	ErrMultipleLogs  = errors.New("multiple matching logs found in block")
 	ErrNoMatchingLog = errors.New("no matching log")
 	Ether            = big.NewFloat(1e18)
-	PeekMethodName   = "peek"
+	LogValueTopic0   = "0x296ba4ca62c6c21c95e828080cb8aec7481b71390585605300a8a76f9e95b527"
-	PepLogTopic0     = "0x296ba4ca62c6c21c95e828080cb8aec7481b71390585605300a8a76f9e95b527"
+	MedianizerABI    = `[{"constant":false,"inputs":[{"name":"owner_","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"","type":"bytes32"}],"name":"poke","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"poke","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"compute","outputs":[{"name":"","type":"bytes32"},{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"wat","type":"address"}],"name":"set","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wat","type":"address"}],"name":"unset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"indexes","outputs":[{"name":"","type":"bytes12"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"next","outputs":[{"name":"","type":"bytes12"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"read","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"peek","outputs":[{"name":"","type":"bytes32"},{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes12"}],"name":"values","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"min_","type":"uint96"}],"name":"setMin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"authority_","type":"address"}],"name":"setAuthority","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"void","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"pos","type":"bytes12"},{"name":"wat","type":"address"}],"name":"set","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"authority","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"pos","type":"bytes12"}],"name":"unset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"next_","type":"bytes12"}],"name":"setNext","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"min","outputs":[{"name":"","type":"uint96"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"val","type":"bytes32"}],"name":"LogValue","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"authority","type":"address"}],"name":"LogSetAuthority","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"}],"name":"LogSetOwner","type":"event"}]]`
-	PipLogTopic0     = "0x1817835800000000000000000000000000000000000000000000000000000000"
-	PipMedianizerABI = `[{"constant":false,"inputs":[{"name":"owner_","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"","type":"bytes32"}],"name":"poke","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"poke","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"compute","outputs":[{"name":"","type":"bytes32"},{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"wat","type":"address"}],"name":"set","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"wat","type":"address"}],"name":"unset","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"indexes","outputs":[{"name":"","type":"bytes12"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"next","outputs":[{"name":"","type":"bytes12"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"read","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"peek","outputs":[{"name":"","type":"bytes32"},{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes12"}],"name":"values","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"min_","type":"uint96"}],"name":"setMin","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"authority_","type":"address"}],"name":"setAuthority","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"void","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"pos","type":"bytes12"},{"name":"wat","type":"address"}],"name":"set","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"authority","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"pos","type":"bytes12"}],"name":"unset","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"next_","type":"bytes12"}],"name":"setNext","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"min","outputs":[{"name":"","type":"uint96"}],"payable":false,"type":"function"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"authority","type":"address"}],"name":"LogSetAuthority","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"}],"name":"LogSetOwner","type":"event"}]`
 	Ray              = big.NewFloat(1e27)
-	RepLogTopic0     = "0x296ba4ca62c6c21c95e828080cb8aec7481b71390585605300a8a76f9e95b527"
 )

pkg/transformers/price_feeds/converter.go

@@ -0,0 +1,32 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds
+
+import (
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+type PriceFeedConverter struct{}
+
+func (converter PriceFeedConverter) ToModel(log types.Log, headerID int64) PriceFeedModel {
+	return PriceFeedModel{
+		BlockNumber:       log.BlockNumber,
+		HeaderID:          headerID,
+		MedianizerAddress: log.Address.Bytes(),
+		UsdValue:          Convert("wad", hexutil.Encode(log.Data), 15),
+		TransactionIndex:  log.TxIndex,
+	}
+}

pkg/transformers/price_feeds/converter_test.go

@@ -0,0 +1,57 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds_test
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+)
+
+var _ = Describe("Price feed converter", func() {
+	It("converts a log to a price feed model", func() {
+		medianizerAddress := common.HexToAddress("0x99041f808d598b782d5a3e498681c2452a31da08")
+		blockNumber := uint64(6147230)
+		txIndex := uint(119)
+		// https://etherscan.io/tx/0xa51a50a2adbfba4e2ab3d72dfd67a21c769f1bc8d2b180663a15500a56cde58f
+		log := types.Log{
+			Address:     medianizerAddress,
+			Topics:      []common.Hash{common.HexToHash(price_feeds.LogValueTopic0)},
+			Data:        common.FromHex("00000000000000000000000000000000000000000000001486f658319fb0c100"),
+			BlockNumber: blockNumber,
+			TxHash:      common.HexToHash("0xa51a50a2adbfba4e2ab3d72dfd67a21c769f1bc8d2b180663a15500a56cde58f"),
+			TxIndex:     txIndex,
+			BlockHash:   common.HexToHash("0x27ecebbf69eefa3bb3cf65f472322a80ff4946653a50a2171dc605f49829467d"),
+			Index:       0,
+			Removed:     false,
+		}
+		converter := price_feeds.PriceFeedConverter{}
+		headerID := int64(123)
+
+		model := converter.ToModel(log, headerID)
+
+		expectedModel := price_feeds.PriceFeedModel{
+			BlockNumber:       blockNumber,
+			HeaderID:          headerID,
+			MedianizerAddress: medianizerAddress[:],
+			UsdValue:          "378.6599388897",
+			TransactionIndex:  txIndex,
+		}
+		Expect(model).To(Equal(expectedModel))
+	})
+})

pkg/transformers/price_feeds/fetcher.go

@@ -0,0 +1,54 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds
+
+import (
+	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"math/big"
+)
+
+type IPriceFeedFetcher interface {
+	FetchLogValues(blockNumber int64) ([]types.Log, error)
+}
+
+type PriceFeedFetcher struct {
+	blockChain        core.BlockChain
+	contractAddresses []string
+}
+
+func NewPriceFeedFetcher(blockChain core.BlockChain, contractAddresses []string) PriceFeedFetcher {
+	return PriceFeedFetcher{
+		blockChain:        blockChain,
+		contractAddresses: contractAddresses,
+	}
+}
+
+func (fetcher PriceFeedFetcher) FetchLogValues(blockNumber int64) ([]types.Log, error) {
+	var addresses []common.Address
+	for _, addr := range fetcher.contractAddresses {
+		addresses = append(addresses, common.HexToAddress(addr))
+	}
+	n := big.NewInt(blockNumber)
+	query := ethereum.FilterQuery{
+		FromBlock: n,
+		ToBlock:   n,
+		Addresses: addresses,
+		Topics:    [][]common.Hash{{common.HexToHash(LogValueTopic0)}},
+	}
+	return fetcher.blockChain.GetEthLogsWithCustomQuery(query)
+}

pkg/transformers/price_feeds/fetcher_test.go

@@ -0,0 +1,64 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds_test
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+)
+
+var _ = Describe("Price fetcher", func() {
+	It("gets log value events from price feed medianizers", func() {
+		mockBlockChain := fakes.NewMockBlockChain()
+		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}})
+		contractAddresses := []string{"pep-contract-address", "pip-contract-address", "rep-contract-address"}
+		fetcher := price_feeds.NewPriceFeedFetcher(mockBlockChain, contractAddresses)
+		blockNumber := int64(100)
+
+		_, err := fetcher.FetchLogValues(blockNumber)
+
+		Expect(err).NotTo(HaveOccurred())
+		var expectedAddresses []common.Address
+		for _, address := range contractAddresses {
+			expectedAddresses = append(expectedAddresses, common.HexToAddress(address))
+		}
+		expectedQuery := ethereum.FilterQuery{
+			FromBlock: big.NewInt(blockNumber),
+			ToBlock:   big.NewInt(blockNumber),
+			Addresses: expectedAddresses,
+			Topics:    [][]common.Hash{{common.HexToHash(price_feeds.LogValueTopic0)}},
+		}
+		mockBlockChain.AssertGetEthLogsWithCustomQueryCalledWith(expectedQuery)
+	})
+
+	It("returns error if getting logs fails", func() {
+		mockBlockChain := fakes.NewMockBlockChain()
+		mockBlockChain.SetGetEthLogsWithCustomQueryErr(fakes.FakeError)
+		fetcher := price_feeds.NewPriceFeedFetcher(mockBlockChain, []string{"contract-address"})
+
+		_, err := fetcher.FetchLogValues(100)
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/price_feeds/pep/fetcher.go

@@ -1,53 +0,0 @@
-package pep
-
-import (
-	"math/big"
-
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type IPepFetcher interface {
-	FetchPepValue(header core.Header) (string, error)
-}
-
-type PepFetcher struct {
-	blockChain      core.BlockChain
-	contractAddress string
-}
-
-func NewPepFetcher(chain core.BlockChain, contractAddress string) PepFetcher {
-	return PepFetcher{
-		blockChain:      chain,
-		contractAddress: contractAddress,
-	}
-}
-
-func (fetcher PepFetcher) FetchPepValue(header core.Header) (string, error) {
-	blockNumber := big.NewInt(header.BlockNumber)
-	query := ethereum.FilterQuery{
-		FromBlock: blockNumber,
-		ToBlock:   blockNumber,
-		Addresses: []common.Address{common.HexToAddress(fetcher.contractAddress)},
-		Topics:    [][]common.Hash{{common.HexToHash(price_feeds.PepLogTopic0)}},
-	}
-	logs, err := fetcher.blockChain.GetEthLogsWithCustomQuery(query)
-	return fetcher.getLogValue(logs, err)
-}
-
-func (fetcher PepFetcher) getLogValue(logs []types.Log, err error) (string, error) {
-	if err != nil {
-		return "", err
-	}
-	if len(logs) < 1 {
-		return "", price_feeds.ErrNoMatchingLog
-	}
-	if len(logs) > 1 {
-		return "", price_feeds.ErrMultipleLogs
-	}
-	return string(logs[0].Data), nil
-}

pkg/transformers/price_feeds/pep/fetcher_test.go

@@ -1,74 +0,0 @@
-package pep_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pep"
-	"math/big"
-)
-
-var _ = Describe("Pep fetcher", func() {
-	It("gets logs describing updated mkr/usd value", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}})
-		contractAddress := "pep-contract-address"
-		fetcher := pep.NewPepFetcher(mockBlockChain, contractAddress)
-		blockNumber := int64(12345)
-		header := core.Header{
-			BlockNumber: blockNumber,
-			Hash:        "",
-			Raw:         nil,
-		}
-
-		_, err := fetcher.FetchPepValue(header)
-
-		Expect(err).NotTo(HaveOccurred())
-		expectedQuery := ethereum.FilterQuery{
-			FromBlock: big.NewInt(blockNumber),
-			ToBlock:   big.NewInt(blockNumber),
-			Addresses: []common.Address{common.HexToAddress(contractAddress)},
-			Topics:    [][]common.Hash{{common.HexToHash(price_feeds.PepLogTopic0)}},
-		}
-		mockBlockChain.AssertGetEthLogsWithCustomQueryCalledWith(expectedQuery)
-	})
-
-	It("returns error if getting logs fails", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}})
-		mockBlockChain.SetGetEthLogsWithCustomQueryErr(fakes.FakeError)
-		fetcher := pep.NewPepFetcher(mockBlockChain, "pep-contract-address")
-
-		_, err := fetcher.FetchPepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(fakes.FakeError))
-	})
-
-	It("returns no matching logs error if no logs returned", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		fetcher := pep.NewPepFetcher(mockBlockChain, "pep-contract-address")
-
-		_, err := fetcher.FetchPepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(price_feeds.ErrNoMatchingLog))
-	})
-
-	It("returns error if more than one matching logs returned", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}, {}})
-		fetcher := pep.NewPepFetcher(mockBlockChain, "pep-contract-address")
-
-		_, err := fetcher.FetchPepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(price_feeds.ErrMultipleLogs))
-	})
-})

pkg/transformers/price_feeds/pep/pep_suite_test.go

@@ -1,13 +0,0 @@
-package pep
-
-import (
-	"testing"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-func TestPep(t *testing.T) {
-	RegisterFailHandler(Fail)
-	RunSpecs(t, "Pep Suite")
-}

pkg/transformers/price_feeds/pep/repository.go

@@ -1,25 +0,0 @@
-package pep
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type IPepRepository interface {
-	CreatePep(pep price_feeds.PriceUpdate) error
-}
-
-type PepRepository struct {
-	db *postgres.DB
-}
-
-func NewPepRepository(db *postgres.DB) PepRepository {
-	return PepRepository{
-		db: db,
-	}
-}
-
-func (repository PepRepository) CreatePep(pep price_feeds.PriceUpdate) error {
-	_, err := repository.db.Exec(`INSERT INTO maker.peps (block_number, header_id, usd_value) VALUES ($1, $2, $3::NUMERIC)`, pep.BlockNumber, pep.HeaderID, pep.UsdValue)
-	return err
-}

pkg/transformers/price_feeds/pep/repository_test.go

@@ -1,51 +0,0 @@
-package pep_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pep"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Pep repository", func() {
-	It("returns header if matching header does not exist", func() {
-		db := test_config.NewTestDB(core.Node{})
-		repository := pep.NewPepRepository(db)
-		pepToAdd := price_feeds.PriceUpdate{
-			BlockNumber: 0,
-			HeaderID:    0,
-			UsdValue:    "123.456",
-		}
-
-		err := repository.CreatePep(pepToAdd)
-
-		Expect(err).To(HaveOccurred())
-	})
-
-	It("creates a pep when matching header exists", func() {
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		repository := pep.NewPepRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerRepository := repositories.NewHeaderRepository(db)
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		pepToAdd := price_feeds.PriceUpdate{
-			BlockNumber: header.BlockNumber,
-			HeaderID:    headerID,
-			UsdValue:    "123.456",
-		}
-
-		err = repository.CreatePep(pepToAdd)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbPep price_feeds.PriceUpdate
-		err = db.Get(&dbPep, `SELECT block_number, header_id, usd_value FROM maker.peps WHERE header_id = $1`, pepToAdd.HeaderID)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbPep).To(Equal(pepToAdd))
-	})
-})

pkg/transformers/price_feeds/pep/transformer.go

@@ -1,43 +0,0 @@
-package pep
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type PepTransformer struct {
-	fetcher    IPepFetcher
-	repository IPepRepository
-}
-
-func NewPepTransformer(chain core.BlockChain, db *postgres.DB, contractAddress string) PepTransformer {
-	fetcher := NewPepFetcher(chain, contractAddress)
-	repository := NewPepRepository(db)
-	return PepTransformer{
-		fetcher:    fetcher,
-		repository: repository,
-	}
-}
-
-func (transformer PepTransformer) Execute(header core.Header, headerID int64) error {
-	logValue, err := transformer.fetcher.FetchPepValue(header)
-	if err != nil {
-		if err == price_feeds.ErrNoMatchingLog {
-			return nil
-		}
-		return err
-	}
-	pep := getPep(logValue, header, headerID)
-	return transformer.repository.CreatePep(pep)
-}
-
-func getPep(logValue string, header core.Header, headerID int64) price_feeds.PriceUpdate {
-	valueInUSD := price_feeds.Convert("wad", logValue, 15)
-	pep := price_feeds.PriceUpdate{
-		BlockNumber: header.BlockNumber,
-		HeaderID:    headerID,
-		UsdValue:    valueInUSD,
-	}
-	return pep
-}

pkg/transformers/price_feeds/pep/transformer_test.go

@@ -1,46 +0,0 @@
-package pep_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pep"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Pep transformer", func() {
-	It("returns nil if no logs found", func() {
-		chain := fakes.NewMockBlockChain()
-		db := test_config.NewTestDB(core.Node{})
-		transformer := pep.NewPepTransformer(chain, db, "pep-contract-address")
-
-		err := transformer.Execute(core.Header{}, 123)
-
-		Expect(err).NotTo(HaveOccurred())
-	})
-
-	It("creates pep row for found log", func() {
-		chain := fakes.NewMockBlockChain()
-		chain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{Data: []byte{1, 2, 3, 4, 5}}})
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		headerRepository := repositories.NewHeaderRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		transformer := pep.NewPepTransformer(chain, db, "pep-contract-address")
-
-		err = transformer.Execute(header, headerID)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbPep price_feeds.PriceUpdate
-		err = db.Get(&dbPep, `SELECT block_number, header_id, usd_value FROM maker.peps WHERE header_id = $1`, headerID)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbPep.BlockNumber).To(Equal(header.BlockNumber))
-	})
-})

pkg/transformers/price_feeds/pip/fetcher.go

@@ -1,77 +0,0 @@
-package pip
-
-import (
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"math/big"
-)
-
-type IPipFetcher interface {
-	FetchPipValue(header core.Header) (string, error)
-}
-
-type PipFetcher struct {
-	blockChain      core.BlockChain
-	contractAddress string
-}
-
-func NewPipFetcher(chain core.BlockChain, contractAddress string) PipFetcher {
-	return PipFetcher{
-		blockChain:      chain,
-		contractAddress: contractAddress,
-	}
-}
-
-func (fetcher PipFetcher) FetchPipValue(header core.Header) (string, error) {
-	blockNumber := big.NewInt(header.BlockNumber)
-	query := ethereum.FilterQuery{
-		FromBlock: blockNumber,
-		ToBlock:   blockNumber,
-		Addresses: []common.Address{common.HexToAddress(fetcher.contractAddress)},
-		Topics:    [][]common.Hash{{common.HexToHash(price_feeds.PipLogTopic0)}},
-	}
-	logs, err := fetcher.blockChain.GetEthLogsWithCustomQuery(query)
-	if err != nil {
-		return "", err
-	}
-	if len(logs) > 0 {
-		return fetcher.getLogValue(logs, err)
-	}
-	return "", price_feeds.ErrNoMatchingLog
-}
-
-func (fetcher PipFetcher) getLogValue(logs []types.Log, err error) (string, error) {
-	var (
-		ret0 = new([32]byte)
-		ret1 = new(bool)
-	)
-	var r = &[]interface{}{
-		ret0,
-		ret1,
-	}
-	err = fetcher.blockChain.FetchContractData(price_feeds.PipMedianizerABI, fetcher.contractAddress, price_feeds.PeekMethodName, nil, r, int64(logs[0].BlockNumber))
-	if err != nil {
-		return "", err
-	}
-	result := newResult(*ret0, *ret1)
-	return result.Value.String(), nil
-}
-
-type Value [32]byte
-
-type Peek struct {
-	Value
-	OK bool
-}
-
-func (value Value) String() string {
-	bi := big.NewInt(0).SetBytes(value[:])
-	return bi.String()
-}
-
-func newResult(value [32]byte, ok bool) *Peek {
-	return &Peek{Value: value, OK: ok}
-}

pkg/transformers/price_feeds/pip/fetcher_test.go

@@ -1,61 +0,0 @@
-package pip_test
-
-import (
-	"github.com/ethereum/go-ethereum/core/types"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pip"
-)
-
-var _ = Describe("Pip fetcher", func() {
-	It("returns error if fetching logs fails", func() {
-		chain := fakes.NewMockBlockChain()
-		chain.SetGetEthLogsWithCustomQueryErr(fakes.FakeError)
-		fetcher := pip.NewPipFetcher(chain, "pip-contract-address")
-
-		_, err := fetcher.FetchPipValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(fakes.FakeError))
-	})
-
-	It("returns no matching logs error if no logs returned", func() {
-		chain := fakes.NewMockBlockChain()
-		fetcher := pip.NewPipFetcher(chain, "pip-contract-address")
-
-		_, err := fetcher.FetchPipValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(price_feeds.ErrNoMatchingLog))
-	})
-
-	Describe("when matching log found", func() {
-		It("calls contract to peek current eth/usd value", func() {
-			blockNumber := uint64(12345)
-			chain := fakes.NewMockBlockChain()
-			chain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{BlockNumber: blockNumber}})
-			contractAddress := "pip-contract-address"
-			fetcher := pip.NewPipFetcher(chain, contractAddress)
-
-			_, err := fetcher.FetchPipValue(core.Header{})
-
-			Expect(err).NotTo(HaveOccurred())
-			chain.AssertFetchContractDataCalledWith(price_feeds.PipMedianizerABI, contractAddress, price_feeds.PeekMethodName, nil, &[]interface{}{[32]byte{}, false}, int64(blockNumber))
-		})
-
-		It("returns error if contract call fails", func() {
-			chain := fakes.NewMockBlockChain()
-			chain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{BlockNumber: uint64(12345)}})
-			chain.SetFetchContractDataErr(fakes.FakeError)
-			fetcher := pip.NewPipFetcher(chain, "pip-contract-address")
-
-			_, err := fetcher.FetchPipValue(core.Header{})
-
-			Expect(err).To(HaveOccurred())
-			Expect(err).To(MatchError(fakes.FakeError))
-		})
-	})
-})

pkg/transformers/price_feeds/pip/pip_suite_test.go

@@ -1,13 +0,0 @@
-package pip
-
-import (
-	"testing"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-func TestPip(t *testing.T) {
-	RegisterFailHandler(Fail)
-	RunSpecs(t, "Pip Suite")
-}

pkg/transformers/price_feeds/pip/repository.go

@@ -1,25 +0,0 @@
-package pip
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type IPipRepository interface {
-	CreatePip(pip price_feeds.PriceUpdate) error
-}
-
-type PipRepository struct {
-	db *postgres.DB
-}
-
-func NewPipRepository(db *postgres.DB) PipRepository {
-	return PipRepository{
-		db: db,
-	}
-}
-
-func (repository PipRepository) CreatePip(pip price_feeds.PriceUpdate) error {
-	_, err := repository.db.Exec(`INSERT INTO maker.pips (block_number, header_id, usd_value) VALUES ($1, $2, $3::NUMERIC)`, pip.BlockNumber, pip.HeaderID, pip.UsdValue)
-	return err
-}

pkg/transformers/price_feeds/pip/repository_test.go

@@ -1,51 +0,0 @@
-package pip_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pip"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Pip repository", func() {
-	It("does not create a pip if no matching header", func() {
-		db := test_config.NewTestDB(core.Node{})
-		repository := pip.NewPipRepository(db)
-		priceUpdate := price_feeds.PriceUpdate{
-			BlockNumber: 0,
-			HeaderID:    0,
-			UsdValue:    "123",
-		}
-
-		err := repository.CreatePip(priceUpdate)
-
-		Expect(err).To(HaveOccurred())
-	})
-
-	It("creates a pip when header exists", func() {
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		repository := pip.NewPipRepository(db)
-		headerRepository := repositories.NewHeaderRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		priceUpdate := price_feeds.PriceUpdate{
-			BlockNumber: header.BlockNumber,
-			HeaderID:    headerID,
-			UsdValue:    "777.777",
-		}
-
-		err = repository.CreatePip(priceUpdate)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbPip price_feeds.PriceUpdate
-		err = db.Get(&dbPip, `SELECT block_number, header_id, usd_value FROM maker.pips WHERE block_number = $1`, header.BlockNumber)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbPip).To(Equal(priceUpdate))
-	})
-})

pkg/transformers/price_feeds/pip/transformer.go

@@ -1,43 +0,0 @@
-package pip
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type PipTransformer struct {
-	fetcher    IPipFetcher
-	repository IPipRepository
-}
-
-func NewPipTransformer(chain core.BlockChain, db *postgres.DB, contractAddress string) PipTransformer {
-	fetcher := NewPipFetcher(chain, contractAddress)
-	repository := NewPipRepository(db)
-	return PipTransformer{
-		fetcher:    fetcher,
-		repository: repository,
-	}
-}
-
-func (transformer PipTransformer) Execute(header core.Header, headerID int64) error {
-	value, err := transformer.fetcher.FetchPipValue(header)
-	if err != nil {
-		if err == price_feeds.ErrNoMatchingLog {
-			return nil
-		}
-		return err
-	}
-	pip := getPip(value, header, headerID)
-	return transformer.repository.CreatePip(pip)
-}
-
-func getPip(logValue string, header core.Header, headerID int64) price_feeds.PriceUpdate {
-	valueInUSD := price_feeds.Convert("wad", logValue, 15)
-	pep := price_feeds.PriceUpdate{
-		BlockNumber: header.BlockNumber,
-		HeaderID:    headerID,
-		UsdValue:    valueInUSD,
-	}
-	return pep
-}

pkg/transformers/price_feeds/pip/transformer_test.go

@@ -1,45 +0,0 @@
-package pip_test
-
-import (
-	"github.com/ethereum/go-ethereum/core/types"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/pip"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Pip transformer", func() {
-	It("returns nil if no logs found", func() {
-		chain := fakes.NewMockBlockChain()
-		db := test_config.NewTestDB(core.Node{})
-		transformer := pip.NewPipTransformer(chain, db, "pip-contract-address")
-
-		err := transformer.Execute(core.Header{}, 123)
-
-		Expect(err).NotTo(HaveOccurred())
-	})
-
-	It("creates pip row for found log", func() {
-		chain := fakes.NewMockBlockChain()
-		chain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{Data: []byte{1, 2, 3, 4, 5}}})
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		headerRepository := repositories.NewHeaderRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		transformer := pip.NewPipTransformer(chain, db, "pip-contract-address")
-
-		err = transformer.Execute(header, headerID)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbPip price_feeds.PriceUpdate
-		err = db.Get(&dbPip, `SELECT block_number, header_id, usd_value FROM maker.pips WHERE header_id = $1`, headerID)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbPip.BlockNumber).To(Equal(header.BlockNumber))
-	})
-})

pkg/transformers/price_feeds/price_feeds_suite_test.go

@@ -0,0 +1,27 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestPriceFeeds(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "PriceFeeds Suite")
+}

pkg/transformers/price_feeds/price_update.go

@@ -1,11 +1,34 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package price_feeds
 
-import "math/big"
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"math/big"
+)
 
-type PriceUpdate struct {
+type LogValueEntity struct {
-	BlockNumber int64  `db:"block_number"`
+	Val common.Address
-	HeaderID    int64  `db:"header_id"`
+}
-	UsdValue    string `db:"usd_value"`
+
+type PriceFeedModel struct {
+	BlockNumber       uint64 `db:"block_number"`
+	HeaderID          int64  `db:"header_id"`
+	MedianizerAddress []byte `db:"medianizer_address"`
+	UsdValue          string `db:"usd_value"`
+	TransactionIndex  uint   `db:"tx_idx"`
 }
 
 func Convert(conversion string, value string, prec int) string {

pkg/transformers/price_feeds/rep/fetcher.go

@@ -1,51 +0,0 @@
-package rep
-
-import (
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"math/big"
-)
-
-type IRepFetcher interface {
-	FetchRepValue(header core.Header) (string, error)
-}
-
-type RepFetcher struct {
-	chain           core.BlockChain
-	contractAddress string
-}
-
-func NewRepFetcher(chain core.BlockChain, contractAddress string) RepFetcher {
-	return RepFetcher{
-		chain:           chain,
-		contractAddress: contractAddress,
-	}
-}
-
-func (fetcher RepFetcher) FetchRepValue(header core.Header) (string, error) {
-	blockNumber := big.NewInt(header.BlockNumber)
-	query := ethereum.FilterQuery{
-		FromBlock: blockNumber,
-		ToBlock:   blockNumber,
-		Addresses: []common.Address{common.HexToAddress(fetcher.contractAddress)},
-		Topics:    [][]common.Hash{{common.HexToHash(price_feeds.RepLogTopic0)}},
-	}
-	logs, err := fetcher.chain.GetEthLogsWithCustomQuery(query)
-	return fetcher.getLogValue(logs, err)
-}
-
-func (fetcher RepFetcher) getLogValue(logs []types.Log, err error) (string, error) {
-	if err != nil {
-		return "", err
-	}
-	if len(logs) < 1 {
-		return "", price_feeds.ErrNoMatchingLog
-	}
-	if len(logs) > 1 {
-		return "", price_feeds.ErrMultipleLogs
-	}
-	return string(logs[0].Data), nil
-}

pkg/transformers/price_feeds/rep/fetcher_test.go

@@ -1,72 +0,0 @@
-package rep_test
-
-import (
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/rep"
-	"math/big"
-)
-
-var _ = Describe("Rep fetcher", func() {
-	It("gets logs describing updated rep/usd value", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}})
-		contractAddress := "rep-contract-address"
-		fetcher := rep.NewRepFetcher(mockBlockChain, contractAddress)
-		blockNumber := int64(100)
-		header := core.Header{
-			BlockNumber: blockNumber,
-			Hash:        "",
-			Raw:         nil,
-		}
-
-		_, err := fetcher.FetchRepValue(header)
-
-		Expect(err).NotTo(HaveOccurred())
-		expectedQuery := ethereum.FilterQuery{
-			FromBlock: big.NewInt(blockNumber),
-			ToBlock:   big.NewInt(blockNumber),
-			Addresses: []common.Address{common.HexToAddress(contractAddress)},
-			Topics:    [][]common.Hash{{common.HexToHash(price_feeds.RepLogTopic0)}},
-		}
-		mockBlockChain.AssertGetEthLogsWithCustomQueryCalledWith(expectedQuery)
-	})
-
-	It("returns error if getting logs fails", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryErr(fakes.FakeError)
-		fetcher := rep.NewRepFetcher(mockBlockChain, "rep-contract-address")
-
-		_, err := fetcher.FetchRepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(fakes.FakeError))
-	})
-
-	It("returns no matching logs error if no logs returned", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		fetcher := rep.NewRepFetcher(mockBlockChain, "rep-contract-address")
-
-		_, err := fetcher.FetchRepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(price_feeds.ErrNoMatchingLog))
-	})
-
-	It("returns error if more than one matching logs returned", func() {
-		mockBlockChain := fakes.NewMockBlockChain()
-		mockBlockChain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{}, {}})
-		fetcher := rep.NewRepFetcher(mockBlockChain, "rep-contract-address")
-
-		_, err := fetcher.FetchRepValue(core.Header{})
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(price_feeds.ErrMultipleLogs))
-	})
-})

pkg/transformers/price_feeds/rep/rep_suite_test.go

@@ -1,13 +0,0 @@
-package rep_test
-
-import (
-	"testing"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-func TestRep(t *testing.T) {
-	RegisterFailHandler(Fail)
-	RunSpecs(t, "Rep Suite")
-}

pkg/transformers/price_feeds/rep/repository.go

@@ -1,25 +0,0 @@
-package rep
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type IRepRepository interface {
-	CreateRep(rep price_feeds.PriceUpdate) error
-}
-
-type RepRepository struct {
-	db *postgres.DB
-}
-
-func NewRepRepository(db *postgres.DB) RepRepository {
-	return RepRepository{
-		db: db,
-	}
-}
-
-func (repository RepRepository) CreateRep(rep price_feeds.PriceUpdate) error {
-	_, err := repository.db.Exec(`INSERT INTO maker.reps (block_number, header_id, usd_value) VALUES ($1, $2, $3::NUMERIC)`, rep.BlockNumber, rep.HeaderID, rep.UsdValue)
-	return err
-}

pkg/transformers/price_feeds/rep/repository_test.go

@@ -1,50 +0,0 @@
-package rep_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/rep"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Rep repository", func() {
-	It("returns header if matching header does not exist", func() {
-		db := test_config.NewTestDB(core.Node{})
-		repository := rep.NewRepRepository(db)
-		pepToAdd := price_feeds.PriceUpdate{
-			BlockNumber: 0,
-			HeaderID:    0,
-			UsdValue:    "123.456",
-		}
-
-		err := repository.CreateRep(pepToAdd)
-
-		Expect(err).To(HaveOccurred())
-	})
-
-	It("creates a rep when matching header exists", func() {
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		repository := rep.NewRepRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerRepository := repositories.NewHeaderRepository(db)
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		pepToAdd := price_feeds.PriceUpdate{
-			BlockNumber: header.BlockNumber,
-			HeaderID:    headerID,
-			UsdValue:    "123.456",
-		}
-
-		err = repository.CreateRep(pepToAdd)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbRep price_feeds.PriceUpdate
-		err = db.Get(&dbRep, `SELECT block_number, header_id, usd_value FROM maker.reps WHERE header_id = $1`, pepToAdd.HeaderID)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbRep).To(Equal(pepToAdd))
-	})
-})

pkg/transformers/price_feeds/rep/transformer.go

@@ -1,43 +0,0 @@
-package rep
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-)
-
-type RepTransformer struct {
-	fetcher    IRepFetcher
-	repository IRepRepository
-}
-
-func NewRepTransformer(chain core.BlockChain, db *postgres.DB, contractAddress string) RepTransformer {
-	fetcher := NewRepFetcher(chain, contractAddress)
-	repository := NewRepRepository(db)
-	return RepTransformer{
-		fetcher:    fetcher,
-		repository: repository,
-	}
-}
-
-func (transformer RepTransformer) Execute(header core.Header, headerID int64) error {
-	logValue, err := transformer.fetcher.FetchRepValue(header)
-	if err != nil {
-		if err == price_feeds.ErrNoMatchingLog {
-			return nil
-		}
-		return err
-	}
-	rep := getRep(logValue, header, headerID)
-	return transformer.repository.CreateRep(rep)
-}
-
-func getRep(logValue string, header core.Header, headerID int64) price_feeds.PriceUpdate {
-	valueInUSD := price_feeds.Convert("wad", logValue, 15)
-	rep := price_feeds.PriceUpdate{
-		BlockNumber: header.BlockNumber,
-		HeaderID:    headerID,
-		UsdValue:    valueInUSD,
-	}
-	return rep
-}

pkg/transformers/price_feeds/rep/transformer_test.go

@@ -1,46 +0,0 @@
-package rep_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds/rep"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Rep transformer", func() {
-	It("returns nil if no logs found", func() {
-		chain := fakes.NewMockBlockChain()
-		db := test_config.NewTestDB(core.Node{})
-		transformer := rep.NewRepTransformer(chain, db, "rep-contract-address")
-
-		err := transformer.Execute(core.Header{}, 123)
-
-		Expect(err).NotTo(HaveOccurred())
-	})
-
-	It("creates rep row for found log", func() {
-		chain := fakes.NewMockBlockChain()
-		chain.SetGetEthLogsWithCustomQueryReturnLogs([]types.Log{{Data: []byte{1, 2, 3, 4, 5}}})
-		db := test_config.NewTestDB(core.Node{})
-		test_config.CleanTestDB(db)
-		headerRepository := repositories.NewHeaderRepository(db)
-		header := core.Header{BlockNumber: 12345}
-		headerID, err := headerRepository.CreateOrUpdateHeader(header)
-		Expect(err).NotTo(HaveOccurred())
-		transformer := rep.NewRepTransformer(chain, db, "rep-contract-address")
-
-		err = transformer.Execute(header, headerID)
-
-		Expect(err).NotTo(HaveOccurred())
-		var dbRep price_feeds.PriceUpdate
-		err = db.Get(&dbRep, `SELECT block_number, header_id, usd_value FROM maker.reps WHERE header_id = $1`, headerID)
-		Expect(err).NotTo(HaveOccurred())
-		Expect(dbRep.BlockNumber).To(Equal(header.BlockNumber))
-	})
-})

pkg/transformers/price_feeds/repository.go

@@ -0,0 +1,56 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type IPriceFeedRepository interface {
+	Create(model PriceFeedModel) error
+	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
+}
+
+type PriceFeedRepository struct {
+	db *postgres.DB
+}
+
+func NewPriceFeedRepository(db *postgres.DB) PriceFeedRepository {
+	return PriceFeedRepository{db: db}
+}
+
+func (repository PriceFeedRepository) Create(model PriceFeedModel) error {
+	_, err := repository.db.Exec(`INSERT INTO maker.price_feeds (block_number, header_id, medianizer_address, usd_value, tx_idx)
+		VALUES ($1, $2, $3, $4::NUMERIC, $5)`, model.BlockNumber, model.HeaderID, model.MedianizerAddress, model.UsdValue, model.TransactionIndex)
+	return err
+}
+
+func (repository PriceFeedRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	var result []core.Header
+	err := repository.db.Select(
+		&result,
+		`SELECT headers.id, headers.block_number FROM headers
+               LEFT JOIN maker.price_feeds on headers.id = header_id
+               WHERE header_id ISNULL
+               AND headers.block_number >= $1
+               AND headers.block_number <= $2
+               AND headers.eth_node_fingerprint = $3`,
+		startingBlockNumber,
+		endingBlockNumber,
+		repository.db.Node.ID,
+	)
+	return result, err
+}

pkg/transformers/price_feeds/repository_test.go

@@ -0,0 +1,147 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Price feeds repository", func() {
+	Describe("Create", func() {
+		It("persists a price feed update", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			blockNumber := uint64(12345)
+			header := core.Header{BlockNumber: int64(blockNumber)}
+			headerID, err := headerRepository.CreateOrUpdateHeader(header)
+			Expect(err).NotTo(HaveOccurred())
+			priceFeedUpdate := price_feeds.PriceFeedModel{
+				BlockNumber:       blockNumber,
+				HeaderID:          headerID,
+				MedianizerAddress: []byte{1, 2, 3, 4, 5},
+				UsdValue:          "123.45",
+				TransactionIndex:  1,
+			}
+			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
+
+			err = priceFeedRepository.Create(priceFeedUpdate)
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbPriceFeedUpdate price_feeds.PriceFeedModel
+			err = db.Get(&dbPriceFeedUpdate, `SELECT block_number, header_id, medianizer_address, usd_value, tx_idx FROM maker.price_feeds WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(dbPriceFeedUpdate).To(Equal(priceFeedUpdate))
+		})
+
+		It("does not duplicate price feed updates", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			blockNumber := uint64(12345)
+			header := core.Header{BlockNumber: int64(blockNumber)}
+			headerID, err := headerRepository.CreateOrUpdateHeader(header)
+			Expect(err).NotTo(HaveOccurred())
+			priceFeedUpdate := price_feeds.PriceFeedModel{
+				BlockNumber:       blockNumber,
+				HeaderID:          headerID,
+				MedianizerAddress: []byte{1, 2, 3, 4, 5},
+				UsdValue:          "123.45",
+				TransactionIndex:  1,
+			}
+			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
+			err = priceFeedRepository.Create(priceFeedUpdate)
+			Expect(err).NotTo(HaveOccurred())
+
+			err = priceFeedRepository.Create(priceFeedUpdate)
+
+			Expect(err).To(HaveOccurred())
+		})
+	})
+
+	Describe("MissingHeaders", func() {
+		It("returns headers with no associated price feed event", func() {
+			node := core.Node{}
+			db := test_config.NewTestDB(node)
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			startingBlockNumber := int64(1)
+			priceFeedBlockNumber := int64(2)
+			endingBlockNumber := int64(3)
+			blockNumbers := []int64{startingBlockNumber, priceFeedBlockNumber, endingBlockNumber, endingBlockNumber + 1}
+			var headerIDs []int64
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				headerIDs = append(headerIDs, headerID)
+				Expect(err).NotTo(HaveOccurred())
+			}
+			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
+			priceFeedUpdate := price_feeds.PriceFeedModel{
+				BlockNumber: uint64(blockNumbers[1]),
+				HeaderID:    headerIDs[1],
+				UsdValue:    "123.45",
+			}
+			err := priceFeedRepository.Create(priceFeedUpdate)
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := priceFeedRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(headers)).To(Equal(2))
+			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
+			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
+		})
+
+		It("only returns headers associated with the current node", func() {
+			nodeOne := core.Node{}
+			db := test_config.NewTestDB(nodeOne)
+			test_config.CleanTestDB(db)
+			blockNumbers := []int64{1, 2, 3}
+			headerRepository := repositories.NewHeaderRepository(db)
+			nodeTwo := core.Node{ID: "second"}
+			dbTwo := test_config.NewTestDB(nodeTwo)
+			headerRepositoryTwo := repositories.NewHeaderRepository(dbTwo)
+			var headerIDs []int64
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+				headerIDs = append(headerIDs, headerID)
+				_, err = headerRepositoryTwo.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+			}
+			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
+			priceFeedRepositoryTwo := price_feeds.NewPriceFeedRepository(dbTwo)
+			err := priceFeedRepository.Create(price_feeds.PriceFeedModel{
+				HeaderID: headerIDs[0],
+				UsdValue: "123.45",
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			nodeOneMissingHeaders, err := priceFeedRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))
+
+			nodeTwoMissingHeaders, err := priceFeedRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
+		})
+	})
+})

pkg/transformers/price_feeds/transformer.go

@@ -0,0 +1,65 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+type PriceFeedTransformerInitializer struct {
+	Config IPriceFeedConfig
+}
+
+func (initializer PriceFeedTransformerInitializer) NewPriceFeedTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := PriceFeedConverter{}
+	fetcher := NewPriceFeedFetcher(blockChain, initializer.Config.ContractAddresses)
+	repository := NewPriceFeedRepository(db)
+	return PriceFeedTransformer{
+		Config:     initializer.Config,
+		converter:  converter,
+		Fetcher:    fetcher,
+		Repository: repository,
+	}
+}
+
+type PriceFeedTransformer struct {
+	Config     IPriceFeedConfig
+	converter  PriceFeedConverter
+	Fetcher    IPriceFeedFetcher
+	Repository IPriceFeedRepository
+}
+
+func (transformer PriceFeedTransformer) Execute() error {
+	headers, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
+	if err != nil {
+		return err
+	}
+	for _, header := range headers {
+		logs, err := transformer.Fetcher.FetchLogValues(header.BlockNumber)
+		if err != nil {
+			return err
+		}
+		for _, log := range logs {
+			model := transformer.converter.ToModel(log, header.Id)
+			err = transformer.Repository.Create(model)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}

pkg/transformers/price_feeds/transformer_test.go

@@ -0,0 +1,150 @@
+// Copyright © 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package price_feeds_test
+
+import (
+	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+	price_feeds2 "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/price_feeds"
+	"math/big"
+)
+
+var _ = Describe("Price feed transformer", func() {
+	It("gets missing headers for price feeds", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		transformer := price_feeds.PriceFeedTransformer{
+			Config:     price_feeds.PriceFeedConfig,
+			Fetcher:    &price_feeds2.MockPriceFeedFetcher{},
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		mockRepository.AssertMissingHeadersCalledwith(price_feeds.PriceFeedConfig.StartingBlockNumber, price_feeds.PriceFeedConfig.EndingBlockNumber)
+	})
+
+	It("returns error is missing headers call returns err", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		mockRepository.SetMissingHeadersErr(fakes.FakeError)
+		transformer := price_feeds.PriceFeedTransformer{
+			Fetcher:    &price_feeds2.MockPriceFeedFetcher{},
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("fetches logs for missing headers", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		blockNumberOne := int64(1)
+		blockNumberTwo := int64(2)
+		mockRepository.SetMissingHeaders([]core.Header{{BlockNumber: blockNumberOne}, {BlockNumber: blockNumberTwo}})
+		mockFetcher := &price_feeds2.MockPriceFeedFetcher{}
+		transformer := price_feeds.PriceFeedTransformer{
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		mockFetcher.AssertFetchLogValuesCalledWith([]int64{blockNumberOne, blockNumberTwo})
+	})
+
+	It("returns err if fetcher returns err", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		mockRepository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		mockFetcher := &price_feeds2.MockPriceFeedFetcher{}
+		mockFetcher.SetReturnErr(fakes.FakeError)
+		transformer := price_feeds.PriceFeedTransformer{
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists model converted from log", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		headerID := int64(11111)
+		mockRepository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: headerID}})
+		mockFetcher := &price_feeds2.MockPriceFeedFetcher{}
+		blockNumber := uint64(22222)
+		txIndex := uint(33333)
+		usdValue := int64(44444)
+		etherMultiplier, _ := price_feeds.Ether.Int64()
+		rawUsdValue := big.NewInt(0)
+		rawUsdValue = rawUsdValue.Mul(big.NewInt(usdValue), big.NewInt(etherMultiplier))
+		address := common.BytesToAddress([]byte{1, 2, 3, 4, 5})
+		fakeLog := types.Log{
+			Address:     address,
+			Topics:      nil,
+			Data:        rawUsdValue.Bytes(),
+			BlockNumber: blockNumber,
+			TxHash:      common.Hash{},
+			TxIndex:     txIndex,
+			BlockHash:   common.Hash{},
+			Index:       0,
+			Removed:     false,
+		}
+		mockFetcher.SetReturnLogs([]types.Log{fakeLog})
+		transformer := price_feeds.PriceFeedTransformer{
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		expectedModel := price_feeds.PriceFeedModel{
+			BlockNumber:       blockNumber,
+			HeaderID:          headerID,
+			MedianizerAddress: address.Bytes(),
+			UsdValue:          fmt.Sprintf("%d", usdValue),
+			TransactionIndex:  txIndex,
+		}
+		mockRepository.AssertCreateCalledWith(expectedModel)
+	})
+
+	It("returns error if creating price feed update returns error", func() {
+		mockRepository := &price_feeds2.MockPriceFeedRepository{}
+		mockRepository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		mockRepository.SetCreateErr(fakes.FakeError)
+		mockFetcher := &price_feeds2.MockPriceFeedFetcher{}
+		mockFetcher.SetReturnLogs([]types.Log{{}})
+		transformer := price_feeds.PriceFeedTransformer{
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/shared/transformer.go

@@ -27,6 +27,14 @@ type Transformer interface {
 
 type TransformerInitializer func(db *postgres.DB, blockChain core.BlockChain) Transformer
 
+type TransformerConfig struct {
+	ContractAddresses   string
+	ContractAbi         string
+	Topics              []string
+	StartingBlockNumber int64
+	EndingBlockNumber   int64
+}
+
 func HexToInt64(byteString string) int64 {
 	value := common.HexToHash(byteString)
 	return value.Big().Int64()

pkg/transformers/test_data/mocks/price_feeds/fetcher.go

@@ -0,0 +1,29 @@
+package price_feeds
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/gomega"
+)
+
+type MockPriceFeedFetcher struct {
+	passedBlockNumbers []int64
+	returnErr          error
+	returnLogs         []types.Log
+}
+
+func (fetcher *MockPriceFeedFetcher) SetReturnErr(err error) {
+	fetcher.returnErr = err
+}
+
+func (fetcher *MockPriceFeedFetcher) SetReturnLogs(logs []types.Log) {
+	fetcher.returnLogs = logs
+}
+
+func (fetcher *MockPriceFeedFetcher) FetchLogValues(blockNumber int64) ([]types.Log, error) {
+	fetcher.passedBlockNumbers = append(fetcher.passedBlockNumbers, blockNumber)
+	return fetcher.returnLogs, fetcher.returnErr
+}
+
+func (fetcher *MockPriceFeedFetcher) AssertFetchLogValuesCalledWith(blockNumbers []int64) {
+	Expect(fetcher.passedBlockNumbers).To(Equal(blockNumbers))
+}

pkg/transformers/test_data/mocks/price_feeds/repository.go

@@ -0,0 +1,49 @@
+package price_feeds
+
+import (
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+)
+
+type MockPriceFeedRepository struct {
+	createErr                 error
+	missingHeaders            []core.Header
+	missingHeadersErr         error
+	passedEndingBlockNumber   int64
+	passedModel               price_feeds.PriceFeedModel
+	passedStartingBlockNumber int64
+}
+
+func (repository *MockPriceFeedRepository) SetCreateErr(err error) {
+	repository.createErr = err
+}
+
+func (repository *MockPriceFeedRepository) SetMissingHeadersErr(err error) {
+	repository.missingHeadersErr = err
+}
+
+func (repository *MockPriceFeedRepository) SetMissingHeaders(headers []core.Header) {
+	repository.missingHeaders = headers
+}
+
+func (repository *MockPriceFeedRepository) Create(model price_feeds.PriceFeedModel) error {
+	repository.passedModel = model
+	return repository.createErr
+}
+
+func (repository *MockPriceFeedRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	repository.passedStartingBlockNumber = startingBlockNumber
+	repository.passedEndingBlockNumber = endingBlockNumber
+	return repository.missingHeaders, repository.missingHeadersErr
+}
+
+func (repository *MockPriceFeedRepository) AssertCreateCalledWith(model price_feeds.PriceFeedModel) {
+	Expect(repository.passedModel).To(Equal(model))
+}
+
+func (repository *MockPriceFeedRepository) AssertMissingHeadersCalledwith(startingBlockNumber, endingBlockNumber int64) {
+	Expect(repository.passedStartingBlockNumber).To(Equal(startingBlockNumber))
+	Expect(repository.passedEndingBlockNumber).To(Equal(endingBlockNumber))
+}

pkg/transformers/transformer.go

@@ -1,9 +0,0 @@
-package transformers
-
-import (
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-)
-
-type Transformer interface {
-	Execute(header core.Header, headerID int64) error
-}

pkg/transformers/transformers.go

@@ -17,6 +17,7 @@ package transformers
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flip_kick"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
@@ -25,8 +26,11 @@ func TransformerInitializers() []shared.TransformerInitializer {
 	flipKickTransformerInitializer := flip_kick.FlipKickTransformerInitializer{Config: flipKickConfig}
 	frobConfig := frob.FrobConfig
 	frobTransformerInitializer := frob.FrobTransformerInitializer{Config: frobConfig}
+	priceFeedConfig := price_feeds.PriceFeedConfig
+	priceFeedTransformerInitializer := price_feeds.PriceFeedTransformerInitializer{Config: priceFeedConfig}
 	return []shared.TransformerInitializer{
 		flipKickTransformerInitializer.NewFlipKickTransformer,
 		frobTransformerInitializer.NewFrobTransformer,
+		priceFeedTransformerInitializer.NewPriceFeedTransformer,
 	}
 }

test_config/test_config.go

@@ -77,9 +77,6 @@ func CleanTestDB(db *postgres.DB) {
 	db.MustExec("DELETE FROM headers")
 	db.MustExec("DELETE FROM log_filters")
 	db.MustExec("DELETE FROM logs")
-	db.MustExec("DELETE FROM maker.peps")
-	db.MustExec("DELETE FROM maker.pips")
-	db.MustExec("DELETE FROM maker.reps")
 	db.MustExec("DELETE FROM receipts")
 	db.MustExec("DELETE FROM transactions")
 	db.MustExec("DELETE FROM watched_contracts")