80 lines
2.9 KiB
Go
80 lines
2.9 KiB
Go
// Copyright 2019 Vulcanize
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fetcher
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/statediff"
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"github.com/sirupsen/logrus"
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"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
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"github.com/vulcanize/vulcanizedb/libraries/shared/streamer"
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)
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type GethRpcStorageFetcher struct {
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statediffPayloadChan chan statediff.Payload
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streamer streamer.Streamer
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}
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func NewGethRpcStorageFetcher(streamer streamer.Streamer, statediffPayloadChan chan statediff.Payload) GethRpcStorageFetcher {
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return GethRpcStorageFetcher{
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statediffPayloadChan: statediffPayloadChan,
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streamer: streamer,
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}
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}
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func (fetcher GethRpcStorageFetcher) FetchStorageDiffs(out chan<- utils.StorageDiff, errs chan<- error) {
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ethStatediffPayloadChan := fetcher.statediffPayloadChan
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clientSubscription, clientSubErr := fetcher.streamer.Stream(ethStatediffPayloadChan)
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if clientSubErr != nil {
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errs <- clientSubErr
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panic(fmt.Sprintf("Error creating a geth client subscription: %v", clientSubErr))
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}
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logrus.Info("Successfully created a geth client subscription: ", clientSubscription)
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for {
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diff := <-ethStatediffPayloadChan
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logrus.Trace("received a statediff")
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stateDiff := new(statediff.StateDiff)
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decodeErr := rlp.DecodeBytes(diff.StateDiffRlp, stateDiff)
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if decodeErr != nil {
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logrus.Warn("Error decoding state diff into RLP: ", decodeErr)
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errs <- decodeErr
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}
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accounts := getAccountDiffs(*stateDiff)
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logrus.Trace(fmt.Sprintf("iterating through %d accounts on stateDiff for block %d", len(accounts), stateDiff.BlockNumber))
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for _, account := range accounts {
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logrus.Trace(fmt.Sprintf("iterating through %d Storage values on account", len(account.Storage)))
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for _, storage := range account.Storage {
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logrus.Trace("adding storage diff to out channel")
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out <- utils.StorageDiff{
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Contract: common.BytesToAddress(account.Key),
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BlockHash: stateDiff.BlockHash,
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BlockHeight: int(stateDiff.BlockNumber.Int64()),
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StorageKey: common.BytesToHash(storage.Key),
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StorageValue: common.BytesToHash(storage.Value),
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}
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}
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}
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}
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}
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func getAccountDiffs(stateDiff statediff.StateDiff) []statediff.AccountDiff {
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accounts := append(stateDiff.CreatedAccounts, stateDiff.UpdatedAccounts...)
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return append(accounts, stateDiff.DeletedAccounts...)
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}
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