Backfill/listen for contract logs (#113)

Gododir/main.go

@@ -44,16 +44,14 @@ func tasks(p *do.Project) {
 
 	p.Task("getLogs", nil, func(context *do.Context) {
 		environment := parseEnvironment(context)
-		blockNumber := context.Args.MayInt(-1, "block-number", "b")
 		contractHash := context.Args.MayString("", "contract-hash", "c")
 		if contractHash == "" {
 			log.Fatalln("--contract-hash required")
 		}
-		context.Start(`go run main.go --environment={{.environment}} --contract-hash={{.contractHash}} --block-number={{.blockNumber}}`,
+		context.Start(`go run main.go --environment={{.environment}} --contract-hash={{.contractHash}}`,
 			do.M{
 				"environment":  environment,
 				"contractHash": contractHash,
-				"blockNumber":  blockNumber,
 				"$in":          "cmd/get_logs",
 			})
 	})

README.md

@@ -93,8 +93,8 @@ The name of the JSON file should correspond the contract's address.
 
 ## Retrieving Contract Logs
 
-1. Get the logs    
-    - `godo getLogs -- --environment=<some-environment> --contract-hash=<contract-address> --starting-number=<starting-block-number>`
+1. Get the logs for a specific contract
+    - `godo getLogs -- --environment=<some-environment> --contract-hash=<contract-address>`
     
 ### Configuring Additional Environments
 

cmd/get_logs/main.go

@@ -1,45 +1,71 @@
 package main
 
 import (
-	"fmt"
 	"log"
 
 	"flag"
 
+	"math/big"
+
+	"time"
+
 	"github.com/8thlight/vulcanizedb/cmd"
 	"github.com/8thlight/vulcanizedb/pkg/core"
 	"github.com/8thlight/vulcanizedb/pkg/geth"
 )
 
+func min(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+const (
+	windowSize      = 24
+	pollingInterval = 10 * time.Second
+)
+
 func main() {
 	environment := flag.String("environment", "", "Environment name")
 	contractHash := flag.String("contract-hash", "", "Contract hash to show summary")
-	_blockNumber := flag.Int64("block-number", -1, "Block number of summary")
+	ticker := time.NewTicker(pollingInterval)
+	defer ticker.Stop()
 
 	flag.Parse()
 
 	config := cmd.LoadConfig(*environment)
 	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
 	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
-	blockNumber := cmd.RequestedBlockNumber(_blockNumber)
 
-	logs, err := blockchain.GetLogs(core.Contract{Hash: *contractHash}, blockNumber)
+	lastBlockNumber := blockchain.LastBlock().Int64()
+	stepSize := int64(1000)
+
+	go func() {
+		for i := int64(0); i < lastBlockNumber; i = min(i+stepSize, lastBlockNumber) {
+			logs, err := blockchain.GetLogs(core.Contract{Hash: *contractHash}, big.NewInt(i), big.NewInt(i+stepSize))
+			log.Println("Backfilling Logs:", i)
 			if err != nil {
-		log.Fatalln(err)
+				log.Println(err)
 			}
 			repository.CreateLogs(logs)
-	for _, l := range logs {
-		fmt.Println("\tAddress: ", l.Address)
-		fmt.Println("\tTxHash: ", l.TxHash)
-		fmt.Println("\tBlockNumber ", l.BlockNumber)
-		fmt.Println("\tIndex ", l.Index)
-		fmt.Println("\tTopics: ")
-		for i, topic := range l.Topics {
-			fmt.Printf("\t\tTopic %d: %s\n", i, topic)
 		}
-		fmt.Printf("\tData: %s", l.Data)
-		fmt.Print("\n\n")
+	}()
 
+	done := make(chan struct{})
+	go func() { done <- struct{}{} }()
+	for range ticker.C {
+		select {
+		case <-done:
+			go func() {
+				z := &big.Int{}
+				z.Sub(blockchain.LastBlock(), big.NewInt(25))
+				log.Printf("Logs Window: %d - %d", z.Int64(), blockchain.LastBlock().Int64())
+				logs, _ := blockchain.GetLogs(core.Contract{Hash: *contractHash}, z, blockchain.LastBlock())
+				repository.CreateLogs(logs)
+				done <- struct{}{}
+			}()
+		default:
+		}
 	}
-
 }

integration_test/contract_test.go

@@ -119,7 +119,7 @@ var _ = Describe("Reading contracts", func() {
 			blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
 			contract := testing.SampleContract()
 
-			logs, err := blockchain.GetLogs(contract, big.NewInt(4703824))
+			logs, err := blockchain.GetLogs(contract, big.NewInt(4703824), nil)
 
 			Expect(err).To(BeNil())
 			Expect(len(logs)).To(Equal(3))
@@ -131,7 +131,7 @@ var _ = Describe("Reading contracts", func() {
 			config, _ := cfg.NewConfig("infura")
 			blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
 
-			logs, err := blockchain.GetLogs(core.Contract{Hash: "x123"}, big.NewInt(4703824))
+			logs, err := blockchain.GetLogs(core.Contract{Hash: "x123"}, big.NewInt(4703824), nil)
 
 			Expect(err).To(BeNil())
 			Expect(len(logs)).To(Equal(0))

pkg/core/blockchain.go

@@ -11,5 +11,5 @@ type Blockchain interface {
 	StopListening()
 	GetAttributes(contract Contract) (ContractAttributes, error)
 	GetAttribute(contract Contract, attributeName string, blockNumber *big.Int) (interface{}, error)
-	GetLogs(contract Contract, blockNumber *big.Int) ([]Log, error)
+	GetLogs(contract Contract, startingBlockNumber *big.Int, endingBlockNumber *big.Int) ([]Log, error)
 }

pkg/fakes/blockchain.go

@@ -27,7 +27,7 @@ func (blockchain *Blockchain) LastBlock() *big.Int {
 	return big.NewInt(max)
 }
 
-func (blockchain *Blockchain) GetLogs(contract core.Contract, blockNumber *big.Int) ([]core.Log, error) {
+func (blockchain *Blockchain) GetLogs(contract core.Contract, startingBlock *big.Int, endingBlock *big.Int) ([]core.Log, error) {
 	return blockchain.logs[contract.Hash], nil
 }
 

pkg/geth/geth_blockchain.go

@@ -23,14 +23,14 @@ type GethBlockchain struct {
 	node                core.Node
 }
 
-func (blockchain *GethBlockchain) GetLogs(contract core.Contract, blockNumber *big.Int) ([]core.Log, error) {
-	if blockNumber == nil {
-		blockNumber = blockchain.LastBlock()
+func (blockchain *GethBlockchain) GetLogs(contract core.Contract, startingBlockNumber *big.Int, endingBlockNumber *big.Int) ([]core.Log, error) {
+	if endingBlockNumber == nil {
+		endingBlockNumber = startingBlockNumber
 	}
 	contractAddress := common.HexToAddress(contract.Hash)
 	fc := ethereum.FilterQuery{
-		FromBlock: blockNumber,
-		ToBlock:   blockNumber,
+		FromBlock: startingBlockNumber,
+		ToBlock:   endingBlockNumber,
 		Addresses: []common.Address{contractAddress},
 	}
 	gethLogs, err := blockchain.client.FilterLogs(context.Background(), fc)