107 lines
2.7 KiB
Go
107 lines
2.7 KiB
Go
package sql
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import (
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"context"
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"reflect"
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"github.com/ethereum/go-ethereum/log"
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)
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// Changing this to 1 would make sure only sequential COPYs were combined.
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const copyFromCheckLimit = 100
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type DelayedTx struct {
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cache []interface{}
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db Database
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}
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type cachedStmt struct {
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sql string
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args []interface{}
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}
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type copyFrom struct {
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tableName []string
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columnNames []string
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rows [][]interface{}
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}
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func (cf *copyFrom) appendRows(rows [][]interface{}) {
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cf.rows = append(cf.rows, rows...)
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}
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func (cf *copyFrom) matches(tableName []string, columnNames []string) bool {
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return reflect.DeepEqual(cf.tableName, tableName) && reflect.DeepEqual(cf.columnNames, columnNames)
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}
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func NewDelayedTx(db Database) *DelayedTx {
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return &DelayedTx{db: db}
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}
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func (tx *DelayedTx) QueryRow(ctx context.Context, sql string, args ...interface{}) ScannableRow {
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return tx.db.QueryRow(ctx, sql, args...)
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}
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func (tx *DelayedTx) findPrevCopyFrom(tableName []string, columnNames []string, limit int) (*copyFrom, int) {
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for pos, count := len(tx.cache)-1, 0; pos >= 0 && count < limit; pos, count = pos-1, count+1 {
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prevCopy, ok := tx.cache[pos].(*copyFrom)
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if ok && prevCopy.matches(tableName, columnNames) {
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return prevCopy, count
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}
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}
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return nil, -1
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}
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func (tx *DelayedTx) CopyFrom(ctx context.Context, tableName []string, columnNames []string, rows [][]interface{}) (int64, error) {
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if prevCopy, distance := tx.findPrevCopyFrom(tableName, columnNames, copyFromCheckLimit); nil != prevCopy {
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log.Trace("statediff lazy_tx : Appending to COPY", "table", tableName,
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"current", len(prevCopy.rows), "new", len(rows), "distance", distance)
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prevCopy.appendRows(rows)
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} else {
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tx.cache = append(tx.cache, ©From{tableName, columnNames, rows})
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}
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return 0, nil
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}
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func (tx *DelayedTx) Exec(ctx context.Context, sql string, args ...interface{}) (Result, error) {
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tx.cache = append(tx.cache, cachedStmt{sql, args})
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return nil, nil
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}
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func (tx *DelayedTx) Commit(ctx context.Context) error {
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base, err := tx.db.Begin(ctx)
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if err != nil {
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return err
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}
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defer func() {
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if p := recover(); p != nil {
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rollback(ctx, base)
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panic(p)
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} else if err != nil {
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rollback(ctx, base)
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}
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}()
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for _, item := range tx.cache {
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switch item := item.(type) {
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case *copyFrom:
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_, err := base.CopyFrom(ctx, item.tableName, item.columnNames, item.rows)
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if err != nil {
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log.Error("COPY error", "table", item.tableName, "err", err)
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return err
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}
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case cachedStmt:
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_, err := base.Exec(ctx, item.sql, item.args...)
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if err != nil {
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return err
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}
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}
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}
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tx.cache = nil
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return base.Commit(ctx)
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}
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func (tx *DelayedTx) Rollback(ctx context.Context) error {
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tx.cache = nil
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return nil
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}
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