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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * Copyright 2020, Offchain Labs, Inc. | ||
| * | ||
| * 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 ethbridge | ||
|
|
||
| import ( | ||
| "context" | ||
| "log" | ||
| "math/big" | ||
|
|
||
| "github.com/ethereum/go-ethereum" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/ethereum/go-ethereum/ethclient" | ||
| ) | ||
|
|
||
| func getLogs( | ||
| ctx context.Context, | ||
| client *ethclient.Client, | ||
| filter ethereum.FilterQuery, | ||
| startHeight *big.Int, | ||
| logChan chan types.Log, | ||
| errChan chan error, | ||
| ) error { | ||
| streamingLogChan := make(chan types.Log) | ||
| logSub, err := client.SubscribeFilterLogs(ctx, filter, streamingLogChan) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| header, err := client.HeaderByNumber(ctx, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| go func() { | ||
| defer close(logChan) | ||
| defer logSub.Unsubscribe() | ||
| // Get initial old logs | ||
| filter.FromBlock = startHeight | ||
| filter.ToBlock = header.Number | ||
| logs, err := client.FilterLogs(ctx, filter) | ||
| if err != nil { | ||
| errChan <- err | ||
| return | ||
| } | ||
| for _, ethLog := range logs { | ||
| log.Println("getLogs1", ethLog.BlockNumber, ethLog.TxIndex, ethLog.Index) | ||
| logChan <- ethLog | ||
| } | ||
|
|
||
| // Retreive for log from stream | ||
| ethLog := <-streamingLogChan | ||
| log.Println("getLogs2", ethLog.BlockNumber, ethLog.TxIndex, ethLog.Index) | ||
|
|
||
| // If there was a gap between initial retrieval and the stream, fill it in | ||
| if ethLog.BlockNumber > header.Number.Uint64() { | ||
| filter.FromBlock = header.Number | ||
| filter.ToBlock = new(big.Int).Sub(new(big.Int).SetUint64(ethLog.BlockNumber), big.NewInt(1)) | ||
| logs, err := client.FilterLogs(ctx, filter) | ||
| if err != nil { | ||
| errChan <- err | ||
| return | ||
| } | ||
| for _, ethLog := range logs { | ||
| log.Println("getLogs3", ethLog.BlockNumber, ethLog.TxIndex, ethLog.Index) | ||
| logChan <- ethLog | ||
| } | ||
| } | ||
| logChan <- ethLog | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case ethLog := <-streamingLogChan: | ||
| log.Println("getLogs4", ethLog.BlockNumber, ethLog.TxIndex, ethLog.Index) | ||
| logChan <- ethLog | ||
| case err := <-logSub.Err(): | ||
| errChan <- err | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return nil | ||
| } |