ipld-eth-server/pkg/super_node/eth/api.go

228 lines
7.0 KiB
Go

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