mirror of https://github.com/tikv/client-go.git
160 lines
5.1 KiB
Go
160 lines
5.1 KiB
Go
// Copyright 2021 TiKV Authors
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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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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// NOTE: The code in this file is based on code from the
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// TiDB project, licensed under the Apache License v 2.0
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//
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// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/client/client_collapse.go
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//
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// Copyright 2020 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 client provides tcp connection to kvserver.
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package client
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import (
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"context"
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"strconv"
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"time"
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"github.com/pkg/errors"
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"github.com/tikv/client-go/v2/tikvrpc"
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"github.com/tikv/client-go/v2/util/async"
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"golang.org/x/sync/singleflight"
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)
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var _ Client = reqCollapse{}
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var resolveRegionSf singleflight.Group
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type reqCollapse struct {
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Client
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}
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// NewReqCollapse creates a reqCollapse.
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func NewReqCollapse(client Client) Client {
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return &reqCollapse{client}
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}
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func (r reqCollapse) Close() error {
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if r.Client == nil {
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panic("client should not be nil")
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}
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return r.Client.Close()
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}
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func (r reqCollapse) SendRequest(ctx context.Context, addr string, req *tikvrpc.Request, timeout time.Duration) (*tikvrpc.Response, error) {
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if r.Client == nil {
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panic("client should not be nil")
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}
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if canCollapse, resp, err := r.tryCollapseRequest(ctx, addr, req, timeout); canCollapse {
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return resp, err
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}
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return r.Client.SendRequest(ctx, addr, req, timeout)
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}
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func (r reqCollapse) SendRequestAsync(ctx context.Context, addr string, req *tikvrpc.Request, cb async.Callback[*tikvrpc.Response]) {
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if r.Client == nil {
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panic("client should not be nil")
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}
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cli, ok := r.Client.(ClientAsync)
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if !ok {
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cb.Invoke(nil, errors.Errorf("%T dose not implement ClientAsync interface", r.Client))
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return
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}
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if req.Type == tikvrpc.CmdResolveLock && len(req.ResolveLock().Keys) == 0 && len(req.ResolveLock().TxnInfos) == 0 {
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// try collapse resolve lock request.
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key := strconv.FormatUint(req.Context.RegionId, 10) + "-" + strconv.FormatUint(req.ResolveLock().StartVersion, 10)
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copyReq := *req
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rsC := resolveRegionSf.DoChan(key, func() (interface{}, error) {
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// resolveRegionSf will call this function in a goroutine, thus use SendRequest directly.
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return r.Client.SendRequest(context.Background(), addr, ©Req, ReadTimeoutShort)
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})
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// waiting the response in another goroutine.
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cb.Executor().Go(func() {
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select {
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case <-ctx.Done():
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cb.Schedule(nil, errors.WithStack(ctx.Err()))
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case rs := <-rsC:
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if rs.Err != nil {
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cb.Schedule(nil, errors.WithStack(rs.Err))
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return
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}
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cb.Schedule(rs.Val.(*tikvrpc.Response), nil)
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}
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})
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} else {
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cli.SendRequestAsync(ctx, addr, req, cb)
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}
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}
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func (r reqCollapse) tryCollapseRequest(ctx context.Context, addr string, req *tikvrpc.Request, timeout time.Duration) (canCollapse bool, resp *tikvrpc.Response, err error) {
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switch req.Type {
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case tikvrpc.CmdResolveLock:
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resolveLock := req.ResolveLock()
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if len(resolveLock.Keys) > 0 {
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// can not collapse resolve lock lite
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return
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}
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if len(resolveLock.TxnInfos) > 0 {
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// can not collapse batch resolve locks which is only used by GC worker.
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return
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}
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canCollapse = true
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key := strconv.FormatUint(req.Context.RegionId, 10) + "-" + strconv.FormatUint(resolveLock.StartVersion, 10)
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resp, err = r.collapse(ctx, key, &resolveRegionSf, addr, req, timeout)
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return
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default:
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// now we only support collapse resolve lock.
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return
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}
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}
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func (r reqCollapse) collapse(ctx context.Context, key string, sf *singleflight.Group,
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addr string, req *tikvrpc.Request, timeout time.Duration) (resp *tikvrpc.Response, err error) {
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// because the request may be used by other goroutines, copy the request to avoid data race.
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copyReq := *req
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rsC := sf.DoChan(key, func() (interface{}, error) {
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return r.Client.SendRequest(context.Background(), addr, ©Req, ReadTimeoutShort) // use resolveLock timeout.
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})
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timer := time.NewTimer(timeout)
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defer timer.Stop()
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select {
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case <-ctx.Done():
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err = errors.WithStack(ctx.Err())
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return
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case <-timer.C:
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err = errors.WithStack(context.DeadlineExceeded)
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return
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case rs := <-rsC:
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if rs.Err != nil {
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err = errors.WithStack(rs.Err)
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return
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}
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resp = rs.Val.(*tikvrpc.Response)
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return
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}
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}
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