Save Logs to DB (#100)

* Save logs to database

* Save multiple logs to db

* Add block number parameter to `FindLogs`

pkg/geth/geth_log_to_core_log.go

@@ -8,9 +8,9 @@ import (
 
 func GethLogToCoreLog(gethLog types.Log) core.Log {
 	topics := gethLog.Topics
-	var hexTopics []string
-	for _, topic := range topics {
-		hexTopics = append(hexTopics, topic.Hex())
+	var hexTopics = make(map[int]string)
+	for i, topic := range topics {
+		hexTopics[i] = topic.Hex()
 	}
 	return core.Log{
 		Address: gethLog.Address.Hex(),
@@ -18,6 +18,7 @@ func GethLogToCoreLog(gethLog types.Log) core.Log {
 		BlockNumber: int64(gethLog.BlockNumber),
 		Topics:      hexTopics,
 		TxHash:      gethLog.TxHash.Hex(),
+		Index:       int64(gethLog.Index),
 		Data:        hexutil.Encode(gethLog.Data),
 	}
 }

pkg/geth/geth_log_to_core_log_test.go

@@ -32,9 +32,10 @@ var _ = Describe("Conversion of GethLog to core.Log", func() {
 			BlockNumber: int64(gethLog.BlockNumber),
 			Data:        hexutil.Encode(gethLog.Data),
 			TxHash:      gethLog.TxHash.Hex(),
-			Topics: []string{
-				common.HexToHash("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef").Hex(),
-				common.HexToHash("0x00000000000000000000000080b2c9d7cbbf30a1b0fc8983c647d754c6525615").Hex(),
+			Index:       2,
+			Topics: map[int]string{
+				0: common.HexToHash("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef").Hex(),
+				1: common.HexToHash("0x00000000000000000000000080b2c9d7cbbf30a1b0fc8983c647d754c6525615").Hex(),
 			},
 		}
 
@@ -43,6 +44,7 @@ var _ = Describe("Conversion of GethLog to core.Log", func() {
 		Expect(coreLog.Address).To(Equal(expected.Address))
 		Expect(coreLog.BlockNumber).To(Equal(expected.BlockNumber))
 		Expect(coreLog.Data).To(Equal(expected.Data))
+		Expect(coreLog.Index).To(Equal(expected.Index))
 		Expect(coreLog.Topics[0]).To(Equal(expected.Topics[0]))
 		Expect(coreLog.Topics[1]).To(Equal(expected.Topics[1]))
 		Expect(coreLog.TxHash).To(Equal(expected.TxHash))