Add log while serving getBlockByNumber (#176)

* Add log while serving getBlockByNumber

* Update GQL API to return empty result when header not found for hash

pkg/eth/api.go

@@ -37,7 +37,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth/filters"
 	"github.com/ethereum/go-ethereum/ethclient"
-	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/statediff"
@@ -157,6 +156,7 @@ func (pea *PublicEthAPI) BlockNumber() hexutil.Uint64 {
 // * 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) {
+	logrus.Debug("Received getBlockByNumber request for number ", number.Int64())
 	block, err := pea.B.BlockByNumber(ctx, number)
 	if block != nil && err == nil {
 		return pea.rpcMarshalBlock(block, true, fullTx)
@@ -1097,13 +1097,13 @@ func (pea *PublicEthAPI) writeStateDiffFor(blockHash common.Hash) {
 func (pea *PublicEthAPI) rpcMarshalBlock(b *types.Block, inclTx bool, fullTx bool) (map[string]interface{}, error) {
 	fields, err := RPCMarshalBlock(b, inclTx, fullTx)
 	if err != nil {
-		log.Error("error RPC marshalling block with hash", b.Hash().String(), err)
+		logrus.Error("error RPC marshalling block with hash", b.Hash().String(), err)
 		return nil, err
 	}
 	if inclTx {
 		td, err := pea.B.GetTd(b.Hash())
 		if err != nil {
-			log.Error("error getting td for block with hash", b.Hash().String(), err)
+			logrus.Error("error getting td for block with hash and number", b.Hash().String(), b.Number().String(), err)
 			return nil, err
 		}
 		fields["totalDifficulty"] = (*hexutil.Big)(td)

pkg/eth/cid_retriever.go

@@ -361,7 +361,7 @@ func receiptFilterConditions(id *int, pgStr string, args []interface{}, rctFilte
 // RetrieveFilteredGQLLogs retrieves and returns all the log CIDs provided blockHash that conform to the provided
 // filter parameters.
 func (ecr *CIDRetriever) RetrieveFilteredGQLLogs(tx *sqlx.Tx, rctFilter ReceiptFilter, blockHash *common.Hash) ([]LogResult, error) {
-	log.Debug("retrieving log cids for receipt ids")
+	log.Debug("retrieving log cids for receipt ids with block hash", blockHash.String())
 	args := make([]interface{}, 0, 4)
 	id := 1
 	pgStr := `SELECT CAST(eth.log_cids.block_number as Text), eth.log_cids.leaf_cid, eth.log_cids.index, eth.log_cids.rct_id,
@@ -722,6 +722,7 @@ func (ecr *CIDRetriever) RetrieveHeaderAndTxCIDsByBlockHash(blockHash common.Has
 	err := ecr.gormDB.Preload("TransactionCIDs", func(tx *gorm.DB) *gorm.DB {
 		return tx.Select("cid", "tx_hash", "index", "src", "dst", "header_id", "block_number")
 	}).Joins("IPLD").Find(&headerCIDs, "block_hash = ?", blockHash.String()).Error
+
 	if err != nil {
 		log.Error("header cid retrieval error")
 		return HeaderCIDRecord{}, err

pkg/graphql/graphql.go

@@ -23,6 +23,7 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -1268,10 +1269,12 @@ func (r *Resolver) AllEthHeaderCids(ctx context.Context, args struct {
 	if args.Condition.BlockHash != nil {
 		headerCID, err := r.backend.Retriever.RetrieveHeaderAndTxCIDsByBlockHash(common.HexToHash(*args.Condition.BlockHash))
 		if err != nil {
-			return nil, err
+			if !strings.Contains(err.Error(), "not found") {
+				return nil, err
+			}
+		} else {
+			headerCIDs = append(headerCIDs, headerCID)
 		}
-
-		headerCIDs = append(headerCIDs, headerCID)
 	} else if args.Condition.BlockNumber != nil {
 		headerCIDs, err = r.backend.Retriever.RetrieveHeaderAndTxCIDsByBlockNumber(args.Condition.BlockNumber.ToInt().Int64())
 		if err != nil {