ipld-eth-server/pkg/eth/api.go
2020-09-02 10:19:25 -05:00

198 lines
6.2 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/vulcanize/ipld-eth-indexer/pkg/eth"
"github.com/vulcanize/ipld-eth-server/pkg/shared"
"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/rpc"
)
// APIName is the namespace for the watcher's eth api
const APIName = "eth"
// APIVersion is the version of the watcher'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 {
// don't allow more than 4 topics
break
}
for _, topic := range topicSet {
topicStrSets[i] = append(topicStrSets[i], topic.String())
}
}
filter := ReceiptFilter{
LogAddresses: addrStrs,
Topics: topicStrSets,
}
// Begin tx
tx, err := pea.B.DB.Beginx()
if err != nil {
return nil, err
}
defer func() {
if p := recover(); p != nil {
shared.Rollback(tx)
panic(p)
} else if err != nil {
shared.Rollback(tx)
} else {
err = tx.Commit()
}
}()
// 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
}
rctIPLDs, err := pea.B.Fetcher.FetchRcts(tx, rctCIDs)
if err != nil {
return nil, err
}
if err := tx.Commit(); 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([]eth.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...)
}
rctIPLDs, err := pea.B.Fetcher.FetchRcts(tx, allRctCIDs)
if err != nil {
return nil, err
}
if err := tx.Commit(); err != nil {
return nil, err
}
logs, err := extractLogsOfInterest(rctIPLDs, filter.Topics)
return logs, err // need to return err variable so that we return the err = tx.Commit() assignment in the defer
}
// 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
}
// GetBlockByNumber returns the requested canonical block.
// * When blockNr is -1 the chain head is returned.
// * We cannot support pending block calls since we do not have an active miner
// * When fullTx is true all transactions in the block are returned, otherwise
// only the transaction hash is returned.
func (pea *PublicEthAPI) GetBlockByNumber(ctx context.Context, number rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
block, err := pea.B.BlockByNumber(ctx, number)
if block != nil && err == nil {
return pea.rpcMarshalBlock(block, true, fullTx)
}
return nil, err
}
// GetBlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
// detail, otherwise only the transaction hash is returned.
func (pea *PublicEthAPI) GetBlockByHash(ctx context.Context, hash common.Hash, fullTx bool) (map[string]interface{}, error) {
block, err := pea.B.BlockByHash(ctx, hash)
if block != nil {
return pea.rpcMarshalBlock(block, true, fullTx)
}
return nil, err
}
// GetTransactionByHash returns the transaction for the given hash
// eth ipld-eth-server cannot currently handle pending/tx_pool txs
func (pea *PublicEthAPI) GetTransactionByHash(ctx context.Context, hash common.Hash) (*RPCTransaction, error) {
// Try to return an already finalized transaction
tx, blockHash, blockNumber, index, err := pea.B.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
if tx != nil {
return NewRPCTransaction(tx, blockHash, blockNumber, index), nil
}
// Transaction unknown, return as such
return nil, nil
}