228 lines
7.0 KiB
Go
228 lines
7.0 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"context"
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"math/big"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ipfs/go-block-format"
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"github.com/vulcanize/vulcanizedb/pkg/super_node/config"
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)
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// APIName is the namespace for the super node's eth api
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const APIName = "eth"
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// APIVersion is the version of the super node's eth api
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const APIVersion = "0.0.1"
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type PublicEthAPI struct {
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b *Backend
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}
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// NewPublicEthAPI creates a new PublicEthAPI with the provided underlying Backend
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func NewPublicEthAPI(b *Backend) *PublicEthAPI {
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return &PublicEthAPI{
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b: b,
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}
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}
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// BlockNumber returns the block number of the chain head.
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func (pea *PublicEthAPI) BlockNumber() hexutil.Uint64 {
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number, _ := pea.b.retriever.RetrieveLastBlockNumber()
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return hexutil.Uint64(number)
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}
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// GetLogs returns logs matching the given argument that are stored within the state.
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//
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// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getlogs
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func (pea *PublicEthAPI) GetLogs(ctx context.Context, crit ethereum.FilterQuery) ([]*types.Log, error) {
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// Convert FilterQuery into ReceiptFilter
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addrStrs := make([]string, len(crit.Addresses))
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for i, addr := range crit.Addresses {
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addrStrs[i] = addr.String()
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}
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topicStrSets := make([][]string, 4)
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for i, topicSet := range crit.Topics {
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if i > 3 {
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break
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}
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for _, topic := range topicSet {
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topicStrSets[i] = append(topicStrSets[i], topic.String())
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}
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}
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filter := config.ReceiptFilter{
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Contracts: addrStrs,
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Topics: topicStrSets,
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}
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tx, err := pea.b.db.Beginx()
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if err != nil {
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return nil, err
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}
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// If we have a blockhash to filter on, fire off single retrieval query
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if crit.BlockHash != nil {
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rctCIDs, err := pea.b.retriever.RetrieveRctCIDs(tx, filter, 0, crit.BlockHash, nil)
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if err != nil {
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return nil, err
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}
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if err := tx.Commit(); err != nil {
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return nil, err
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}
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rctIPLDs, err := pea.b.fetcher.FetchRcts(rctCIDs)
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if err != nil {
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return nil, err
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}
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return extractLogsOfInterest(rctIPLDs, filter.Topics)
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}
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// Otherwise, create block range from criteria
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// nil values are filled in; to request a single block have both ToBlock and FromBlock equal that number
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startingBlock := crit.FromBlock
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endingBlock := crit.ToBlock
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if startingBlock == nil {
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startingBlockInt, err := pea.b.retriever.RetrieveFirstBlockNumber()
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if err != nil {
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return nil, err
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}
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startingBlock = big.NewInt(startingBlockInt)
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}
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if endingBlock == nil {
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endingBlockInt, err := pea.b.retriever.RetrieveLastBlockNumber()
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if err != nil {
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return nil, err
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}
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endingBlock = big.NewInt(endingBlockInt)
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}
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start := startingBlock.Int64()
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end := endingBlock.Int64()
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allRctCIDs := make([]ReceiptModel, 0)
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for i := start; i <= end; i++ {
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rctCIDs, err := pea.b.retriever.RetrieveRctCIDs(tx, filter, i, nil, nil)
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if err != nil {
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return nil, err
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}
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allRctCIDs = append(allRctCIDs, rctCIDs...)
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}
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if err := tx.Commit(); err != nil {
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return nil, err
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}
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rctIPLDs, err := pea.b.fetcher.FetchRcts(allRctCIDs)
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if err != nil {
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return nil, err
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}
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return extractLogsOfInterest(rctIPLDs, filter.Topics)
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}
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func extractLogsOfInterest(rctIPLDs []blocks.Block, wantedTopics [][]string) ([]*types.Log, error) {
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var logs []*types.Log
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for _, rctIPLD := range rctIPLDs {
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rctRLP := rctIPLD.RawData()
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var rct types.ReceiptForStorage
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if err := rlp.DecodeBytes(rctRLP, &rct); err != nil {
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return nil, err
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}
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for _, log := range rct.Logs {
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if wanted := wantedLog(wantedTopics, log.Topics); wanted == true {
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logs = append(logs, log)
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}
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}
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}
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return logs, nil
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}
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// returns true if the log matches on the filter
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func wantedLog(wantedTopics [][]string, actualTopics []common.Hash) bool {
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// actualTopics will always have length <= 4
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// wantedTopics will always have length == 4
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matches := 0
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for i, actualTopic := range actualTopics {
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// If we have topics in this filter slot, count as a match if the actualTopic matches one of the ones in this filter slot
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if len(wantedTopics[i]) > 0 {
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matches += sliceContainsHash(wantedTopics[i], actualTopic)
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} else {
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// Filter slot is empty, not matching any topics at this slot => counts as a match
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matches++
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}
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}
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if matches == len(actualTopics) {
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return true
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}
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return false
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}
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// returns 1 if the slice contains the hash, 0 if it does not
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func sliceContainsHash(slice []string, hash common.Hash) int {
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for _, str := range slice {
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if str == hash.String() {
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return 1
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}
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}
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return 0
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}
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// GetHeaderByNumber returns the requested canonical block header.
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// When blockNr is -1 the chain head is returned.
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// We cannot support pending block calls since we do not have an active miner
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func (pea *PublicEthAPI) GetHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (map[string]interface{}, error) {
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header, err := pea.b.HeaderByNumber(ctx, number)
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if header != nil && err == nil {
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return pea.rpcMarshalHeader(header)
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}
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return nil, err
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}
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// rpcMarshalHeader uses the generalized output filler, then adds the total difficulty field, which requires
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// a `PublicEthAPI`.
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func (pea *PublicEthAPI) rpcMarshalHeader(header *types.Header) (map[string]interface{}, error) {
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fields := RPCMarshalHeader(header)
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td, err := pea.b.GetTd(header.Hash())
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if err != nil {
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return nil, err
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}
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fields["totalDifficulty"] = (*hexutil.Big)(td)
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return fields, nil
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}
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// RPCMarshalHeader converts the given header to the RPC output .
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func RPCMarshalHeader(head *types.Header) map[string]interface{} {
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return map[string]interface{}{
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"number": (*hexutil.Big)(head.Number),
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"hash": head.Hash(),
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"parentHash": head.ParentHash,
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"nonce": head.Nonce,
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"mixHash": head.MixDigest,
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"sha3Uncles": head.UncleHash,
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"logsBloom": head.Bloom,
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"stateRoot": head.Root,
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"miner": head.Coinbase,
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"difficulty": (*hexutil.Big)(head.Difficulty),
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"extraData": hexutil.Bytes(head.Extra),
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"size": hexutil.Uint64(head.Size()),
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"gasLimit": hexutil.Uint64(head.GasLimit),
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"gasUsed": hexutil.Uint64(head.GasUsed),
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"timestamp": hexutil.Uint64(head.Time),
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"transactionsRoot": head.TxHash,
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"receiptsRoot": head.ReceiptHash,
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}
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}
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