123 lines
3.8 KiB
Go
123 lines
3.8 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bindinfo
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import (
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"time"
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"github.com/pingcap/parser"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/metrics"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/types"
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)
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// SessionHandle is used to handle all session sql bind operations.
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type SessionHandle struct {
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ch cache
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parser *parser.Parser
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}
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// NewSessionBindHandle creates a new SessionBindHandle.
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func NewSessionBindHandle(parser *parser.Parser) *SessionHandle {
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sessionHandle := &SessionHandle{parser: parser}
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sessionHandle.ch = make(cache)
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return sessionHandle
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}
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// appendBindRecord adds the BindRecord to the cache, all the stale bindMetas are
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// removed from the cache after this operation.
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func (h *SessionHandle) appendBindRecord(hash string, meta *BindRecord) {
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// Make sure there is only one goroutine writes the cache.
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oldRecord := h.ch.getBindRecord(hash, meta.OriginalSQL, meta.Db)
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newRecord := merge(oldRecord, meta)
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h.ch.setBindRecord(hash, newRecord)
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updateMetrics(metrics.ScopeSession, oldRecord, newRecord, false)
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}
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// AddBindRecord new a BindRecord with BindMeta, add it to the cache.
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func (h *SessionHandle) AddBindRecord(sctx sessionctx.Context, is infoschema.InfoSchema, record *BindRecord) error {
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for i := range record.Bindings {
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record.Bindings[i].CreateTime = types.Time{
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Time: types.FromGoTime(time.Now()),
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Type: mysql.TypeDatetime,
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Fsp: 3,
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}
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record.Bindings[i].UpdateTime = record.Bindings[i].CreateTime
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}
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err := record.prepareHintsForUsing(sctx, is)
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// update the BindMeta to the cache.
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if err == nil {
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h.appendBindRecord(parser.DigestHash(record.OriginalSQL), record)
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}
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return err
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}
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// DropBindRecord drops a BindRecord in the cache.
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func (h *SessionHandle) DropBindRecord(record *BindRecord) {
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oldRecord := h.GetBindRecord(record.OriginalSQL, record.Db)
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var newRecord *BindRecord
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if oldRecord != nil {
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newRecord = oldRecord.remove(record)
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} else {
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newRecord = record
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}
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h.ch.setBindRecord(parser.DigestHash(record.OriginalSQL), newRecord)
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updateMetrics(metrics.ScopeSession, oldRecord, newRecord, false)
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}
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// GetBindRecord return the BindMeta of the (normdOrigSQL,db) if BindMeta exist.
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func (h *SessionHandle) GetBindRecord(normdOrigSQL, db string) *BindRecord {
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hash := parser.DigestHash(normdOrigSQL)
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bindRecords := h.ch[hash]
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if bindRecords != nil {
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for _, bindRecord := range bindRecords {
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if bindRecord.OriginalSQL == normdOrigSQL && bindRecord.Db == db {
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return bindRecord
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}
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}
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}
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return nil
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}
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// GetAllBindRecord return all session bind info.
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func (h *SessionHandle) GetAllBindRecord() (bindRecords []*BindRecord) {
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for _, bindRecord := range h.ch {
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bindRecords = append(bindRecords, bindRecord...)
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}
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return bindRecords
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}
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// Close closes the session handle.
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func (h *SessionHandle) Close() {
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for _, bindRecords := range h.ch {
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for _, bindRecord := range bindRecords {
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updateMetrics(metrics.ScopeSession, bindRecord, nil, false)
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}
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}
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}
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// sessionBindInfoKeyType is a dummy type to avoid naming collision in context.
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type sessionBindInfoKeyType int
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// String defines a Stringer function for debugging and pretty printing.
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func (k sessionBindInfoKeyType) String() string {
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return "session_bindinfo"
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}
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// SessionBindInfoKeyType is a variable key for store session bind info.
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const SessionBindInfoKeyType sessionBindInfoKeyType = 0
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