98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package fetch
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import (
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"context"
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"math/big"
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"strings"
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"github.com/celo-org/celo-blockchain/common/hexutil"
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"github.com/celo-org/celo-blockchain/core/types"
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celo "github.com/grassrootseconomics/cic-celo-sdk"
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"github.com/grassrootseconomics/w3-celo-patch/module/eth"
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"github.com/grassrootseconomics/w3-celo-patch/w3types"
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)
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// RPCOpts reprsents the required paramters for an RPC fetcher.
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type RPCOpts struct {
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RPCProvider *celo.Provider
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}
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// RPC is a RPC based block and transaction fetcher.
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type RPC struct {
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provider *celo.Provider
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}
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// NewRPCFetcher returns a new RPC fetcher which implemnts Fetch.
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// Note: No rate limiting feeature.
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func NewRPCFetcher(o RPCOpts) Fetch {
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return &RPC{
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provider: o.RPCProvider,
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}
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}
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// Block fetches via RPC and transforms the response to adapt to the GraphQL JSON response struct.
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func (f *RPC) Block(ctx context.Context, blockNumber uint64) (FetchResponse, error) {
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var (
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block types.Block
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fetchResponse FetchResponse
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)
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if err := f.provider.Client.CallCtx(
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ctx,
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eth.BlockByNumber(big.NewInt(int64(blockNumber))).Returns(&block),
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); err != nil {
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return fetchResponse, err
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}
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txCount := len(block.Transactions())
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batchCalls := make([]w3types.Caller, txCount*2)
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txs := make([]types.Transaction, txCount)
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txsReceipt := make([]types.Receipt, txCount)
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// Prepare batch calls.
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for i, tx := range block.Transactions() {
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batchCalls[i] = eth.Tx(tx.Hash()).Returns(&txs[i])
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batchCalls[txCount+i] = eth.TxReceipt(tx.Hash()).Returns(&txsReceipt[i])
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}
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if err := f.provider.Client.CallCtx(
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ctx,
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batchCalls...,
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); err != nil {
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return fetchResponse, err
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}
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// Transform response and adapt to FetchResponse.
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for i := 0; i < txCount; i++ {
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var txObject Transaction
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txObject.Block.Number = block.NumberU64()
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txObject.Block.Timestamp = hexutil.EncodeUint64(block.Time())
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from, err := types.Sender(types.LatestSignerForChainID(txs[i].ChainId()), &txs[i])
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if err != nil {
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return fetchResponse, err
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}
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txObject.From.Address = strings.ToLower(from.Hex())
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// This check ignores contract deployment transactions.
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if txs[i].To() != nil {
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txObject.To.Address = strings.ToLower(txs[i].To().Hex())
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}
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txObject.Value = hexutil.EncodeBig(txs[i].Value())
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txObject.InputData = hexutil.Encode(txs[i].Data())
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txObject.Hash = txsReceipt[i].TxHash.Hex()
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txObject.Index = txsReceipt[i].TransactionIndex
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txObject.Status = txsReceipt[i].Status
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txObject.GasUsed = txsReceipt[i].GasUsed
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fetchResponse.Data.Block.Transactions = append(
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fetchResponse.Data.Block.Transactions,
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txObject,
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)
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}
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return fetchResponse, nil
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}
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