Statediff missing parent blocks automatically (#8)

Port of https://github.com/cerc-io/go-ethereum/pull/399 and https://github.com/cerc-io/go-ethereum/pull/397.

Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Reviewed-on: #8

indexer/database/sql/indexer.go

@@ -257,6 +257,7 @@ func (sdi *StateDiffIndexer) processHeader(tx *BatchTx, header *types.Header, he
 		UnclesHash:      header.UncleHash.String(),
 		Timestamp:       header.Time,
 		Coinbase:        header.Coinbase.String(),
+		Canonical:       true,
 	})
 }
 

indexer/database/sql/interfaces.go

@@ -49,6 +49,7 @@ type Statements interface {
 	MaxHeaderStm() string
 	ExistsHeaderStm() string
 	InsertHeaderStm() string
+	SetCanonicalHeaderStm() string
 	InsertUncleStm() string
 	InsertTxStm() string
 	InsertRctStm() string

indexer/database/sql/postgres/database.go

@@ -62,6 +62,12 @@ func (db *DB) InsertHeaderStm() string {
 	return schema.TableHeader.ToInsertStatement(db.upsert)
 }
 
+// SetCanonicalHeaderStm satisfies the sql.Statements interface
+// Stm == Statement
+func (db *DB) SetCanonicalHeaderStm() string {
+	return fmt.Sprintf("UPDATE %s SET canonical = false WHERE block_number = $1::BIGINT AND block_hash <> $2::TEXT AND canonical = true", schema.TableHeader.Name)
+}
+
 // InsertUncleStm satisfies the sql.Statements interface
 func (db *DB) InsertUncleStm() string {
 	return schema.TableUncle.ToInsertStatement(db.upsert)

indexer/database/sql/writer.go

@@ -90,6 +90,7 @@ func (w *Writer) maxHeader() (*models.HeaderModel, error) {
 		&model.Bloom,
 		&model.Timestamp,
 		&model.Coinbase,
+		&model.Canonical,
 	)
 	model.BlockNumber = strconv.FormatUint(number, 10)
 	model.TotalDifficulty = strconv.FormatUint(td, 10)
@@ -118,11 +119,22 @@ func (w *Writer) upsertHeaderCID(tx Tx, header models.HeaderModel) error {
 		header.UnclesHash,
 		header.Bloom,
 		header.Timestamp,
-		header.Coinbase)
+		header.Coinbase,
+		header.Canonical,
+	)
 	if err != nil {
 		return insertError{"eth.header_cids", err, w.db.InsertHeaderStm(), header}
 	}
 	metrics.IndexerMetrics.BlocksCounter.Inc(1)
+
+	_, err = tx.Exec(w.db.Context(), w.db.SetCanonicalHeaderStm(),
+		header.BlockNumber,
+		header.BlockHash,
+	)
+	if err != nil {
+		return insertError{"eth.header_cids", err, w.db.SetCanonicalHeaderStm(), header}
+	}
+
 	return nil
 }