Handle events

- Adds interfaces for developers to build handlers that update data in
response to log events
- Resolves #29

integration_test/block_rewards_test.go

@@ -1,32 +1,22 @@
 package integration
 
 import (
-	"log"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	cfg "github.com/vulcanize/vulcanizedb/pkg/config"
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
 var _ = Describe("Rewards calculations", func() {
 
 	It("calculates a block reward for a real block", func() {
-		config, err := cfg.NewConfig("infura")
-		if err != nil {
-			log.Fatalln(err)
-		}
-		blockchain := geth.NewBlockchain(config.Client.IPCPath)
+		blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 		block := blockchain.GetBlockByNumber(1071819)
 		Expect(block.Reward).To(Equal(5.31355))
 	})
 
 	It("calculates an uncle reward for a real block", func() {
-		config, err := cfg.NewConfig("infura")
-		if err != nil {
-			log.Fatalln(err)
-		}
-		blockchain := geth.NewBlockchain(config.Client.IPCPath)
+		blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 		block := blockchain.GetBlockByNumber(1071819)
 		Expect(block.UnclesReward).To(Equal(6.875))
 	})

integration_test/contract_test.go

@@ -3,25 +3,20 @@ package integration
 import (
 	"math/big"
 
-	"log"
-
+	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	cfg "github.com/vulcanize/vulcanizedb/pkg/config"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
 	"github.com/vulcanize/vulcanizedb/pkg/geth/testing"
+	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
 var _ = Describe("Reading contracts", func() {
 
 	Describe("Reading the list of attributes", func() {
 		It("returns a string attribute for a real contract", func() {
-			config, err := cfg.NewConfig("infura")
-			if err != nil {
-				log.Fatalln(err)
-			}
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			contractAttributes, err := blockchain.GetAttributes(contract)
@@ -34,8 +29,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("does not return an attribute that takes an input", func() {
-			config, err := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			contractAttributes, err := blockchain.GetAttributes(contract)
@@ -46,8 +40,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("does not return an attribute that is not constant", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			contractAttributes, err := blockchain.GetAttributes(contract)
@@ -60,8 +53,7 @@ var _ = Describe("Reading contracts", func() {
 
 	Describe("Getting a contract attribute", func() {
 		It("returns the correct attribute for a real contract", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 
 			contract := testing.SampleContract()
 			name, err := blockchain.GetAttribute(contract, "name", nil)
@@ -71,8 +63,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("returns the correct attribute for a real contract", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			name, err := blockchain.GetAttribute(contract, "name", nil)
@@ -82,8 +73,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("returns the correct attribute for a real contract at a specific block height", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			name, err := blockchain.GetAttribute(contract, "name", big.NewInt(4701536))
@@ -93,8 +83,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("returns an error when asking for an attribute that does not exist", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			name, err := blockchain.GetAttribute(contract, "missing_attribute", nil)
@@ -115,8 +104,7 @@ var _ = Describe("Reading contracts", func() {
 				},
 				Index: 19,
 				Data:  "0x0000000000000000000000000000000000000000000000000c7d713b49da0000"}
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 			contract := testing.SampleContract()
 
 			logs, err := blockchain.GetLogs(contract, big.NewInt(4703824), nil)
@@ -128,8 +116,7 @@ var _ = Describe("Reading contracts", func() {
 		})
 
 		It("returns and empty log array when no events for a given block / contract combo", func() {
-			config, _ := cfg.NewConfig("infura")
-			blockchain := geth.NewBlockchain(config.Client.IPCPath)
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
 
 			logs, err := blockchain.GetLogs(core.Contract{Hash: "x123"}, big.NewInt(4703824), nil)
 
@@ -140,4 +127,19 @@ var _ = Describe("Reading contracts", func() {
 
 	})
 
+	Describe("Fetching Contract data", func() {
+		It("returns the correct attribute for a real contract", func() {
+			blockchain := geth.NewBlockchain(test_config.InfuraClient.IPCPath)
+
+			contract := testing.SampleContract()
+			var balance = new(big.Int)
+			args := common.HexToHash("0xd26114cd6ee289accf82350c8d8487fedb8a0c07")
+			err := blockchain.FetchContractData(contract.Abi, "0xd26114cd6ee289accf82350c8d8487fedb8a0c07", "balanceOf", args, &balance, 5167471)
+			Expect(err).NotTo(HaveOccurred())
+			expected := new(big.Int)
+			expected.SetString("10897295492887612977137", 10)
+			Expect(balance).To(Equal(expected))
+		})
+	})
+
 })

integration_test/geth_blockchain_test.go

@@ -1,29 +1,21 @@
 package integration_test
 
 import (
-	"io/ioutil"
-	"log"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/pkg/config"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/inmemory"
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
-	"github.com/vulcanize/vulcanizedb/pkg/repositories/inmemory"
+	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
-func init() {
-	log.SetOutput(ioutil.Discard)
-}
-
 var _ = Describe("Reading from the Geth blockchain", func() {
 
 	var blockchain *geth.Blockchain
 	var inMemory *inmemory.InMemory
 
 	BeforeEach(func() {
-		cfg, _ := config.NewConfig("private")
-		blockchain = geth.NewBlockchain(cfg.Client.IPCPath)
+		blockchain = geth.NewBlockchain(test_config.TestClientConfig.IPCPath)
 		inMemory = inmemory.NewInMemory()
 	})
 
@@ -52,8 +44,8 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 		devNetworkNodeId := float64(1)
 
 		Expect(node.GenesisBlock).To(Equal(devNetworkGenesisBlock))
-		Expect(node.NetworkId).To(Equal(devNetworkNodeId))
-		Expect(len(node.Id)).To(Equal(128))
+		Expect(node.NetworkID).To(Equal(devNetworkNodeId))
+		Expect(len(node.ID)).To(Equal(128))
 		Expect(node.ClientName).To(ContainSubstring("Geth"))
 
 		close(done)