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les, light: implement ODR transaction lookup by hash (#19069)

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* les, light: implement ODR transaction lookup by hash

* les: delete useless file

* internal/ethapi: always use backend to find transaction

* les, eth, internal/ethapi: renamed GetCanonicalTransaction to GetTransaction

* light: add canonical header verification to GetTransaction
This commit is contained in:
Felföldi Zsolt
2019-05-13 13:41:10 +02:00
committed by Péter Szilágyi
parent f4fb1a1801
commit 40cdcf8c47
16 changed files with 182 additions and 51 deletions
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21
light/odr_util.go
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@ -21,6 +21,7 @@ import (
"context"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
@ -227,3 +228,23 @@ func GetBloomBits(ctx context.Context, odr OdrBackend, bitIdx uint, sectionIdxLi
return result, nil
}
}
// GetTransaction retrieves a canonical transaction by hash and also returns its position in the chain
func GetTransaction(ctx context.Context, odr OdrBackend, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
r := &TxStatusRequest{Hashes: []common.Hash{txHash}}
if err := odr.Retrieve(ctx, r); err != nil || r.Status[0].Status != core.TxStatusIncluded {
return nil, common.Hash{}, 0, 0, err
} else {
pos := r.Status[0].Lookup
// first ensure that we have the header, otherwise block body retrieval will fail
// also verify if this is a canonical block by getting the header by number and checking its hash
if header, err := GetHeaderByNumber(ctx, odr, pos.BlockIndex); err != nil || header.Hash() != pos.BlockHash {
return nil, common.Hash{}, 0, 0, err
}
if body, err := GetBody(ctx, odr, pos.BlockHash, pos.BlockIndex); err != nil || uint64(len(body.Transactions)) <= pos.Index || body.Transactions[pos.Index].Hash() != txHash {
return nil, common.Hash{}, 0, 0, err
} else {
return body.Transactions[pos.Index], pos.BlockHash, pos.BlockIndex, pos.Index, nil
}
}
}