mirror of https://github.com/k3s-io/k3s
225 lines
4.4 KiB
Go
225 lines
4.4 KiB
Go
// Copyright 2016 The etcd 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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package clientv3
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import (
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"fmt"
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"sync"
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"time"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"golang.org/x/net/context"
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utiltrace "k8s.io/apiserver/pkg/util/trace"
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)
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type Txn interface {
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// If takes a list of comparison. If all comparisons passed in succeed,
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// the operations passed into Then() will be executed. Or the operations
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// passed into Else() will be executed.
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If(cs ...Cmp) Txn
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// Then takes a list of operations. The Ops list will be executed, if the
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// comparisons passed in If() succeed.
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Then(ops ...Op) Txn
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// Else takes a list of operations. The Ops list will be executed, if the
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// comparisons passed in If() fail.
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Else(ops ...Op) Txn
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// Commit tries to commit the transaction.
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Commit() (*TxnResponse, error)
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}
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type txn struct {
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kv *kv
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ctx context.Context
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mu sync.Mutex
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cif bool
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cthen bool
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celse bool
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cmps []*pb.Compare
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sus []Op
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fas []Op
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}
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func (txn *txn) If(cs ...Cmp) Txn {
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txn.mu.Lock()
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defer txn.mu.Unlock()
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if txn.cif {
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panic("cannot call If twice!")
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}
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if txn.cthen {
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panic("cannot call If after Then!")
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}
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if txn.celse {
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panic("cannot call If after Else!")
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}
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txn.cif = true
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for i := range cs {
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txn.cmps = append(txn.cmps, (*pb.Compare)(&cs[i]))
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}
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return txn
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}
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func (txn *txn) Then(ops ...Op) Txn {
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txn.mu.Lock()
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defer txn.mu.Unlock()
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if txn.cthen {
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panic("cannot call Then twice!")
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}
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if txn.celse {
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panic("cannot call Then after Else!")
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}
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txn.cthen = true
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for _, op := range ops {
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txn.sus = append(txn.sus, op)
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}
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return txn
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}
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func (txn *txn) Else(ops ...Op) Txn {
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txn.mu.Lock()
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defer txn.mu.Unlock()
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if txn.celse {
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panic("cannot call Else twice!")
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}
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txn.celse = true
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for _, op := range ops {
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txn.fas = append(txn.fas, op)
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}
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return txn
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}
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func (txn *txn) do(op Op) (*pb.ResponseOp, error) {
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switch op.t {
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case tRange:
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r, err := txn.kv.opGet(txn.ctx, op)
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if err != nil {
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return nil, err
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}
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return &pb.ResponseOp{
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Response: &pb.ResponseOp_ResponseRange{
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ResponseRange: (*pb.RangeResponse)(r),
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},
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}, nil
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case tPut:
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r, err := txn.kv.opPut(txn.ctx, op)
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if err != nil {
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return nil, err
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}
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return &pb.ResponseOp{
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Response: &pb.ResponseOp_ResponsePut{
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ResponsePut: (*pb.PutResponse)(r),
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},
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}, nil
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case tDeleteRange:
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r, err := txn.kv.opDelete(txn.ctx, op)
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if err != nil {
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return nil, err
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}
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return &pb.ResponseOp{
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Response: &pb.ResponseOp_ResponseDeleteRange{
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ResponseDeleteRange: (*pb.DeleteRangeResponse)(r),
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},
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}, nil
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default:
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return nil, fmt.Errorf("unknown op in txn: %#v", op)
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}
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}
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func (txn *txn) Commit() (*TxnResponse, error) {
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trace := utiltrace.New("SQL Commit")
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defer trace.LogIfLong(500 * time.Millisecond)
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locks := map[string]bool{}
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resp := &TxnResponse{
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Header: &pb.ResponseHeader{},
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}
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good := true
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for _, c := range txn.cmps {
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k := string(c.Key)
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if !locks[k] {
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txn.kv.l.Lock(k)
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trace.Step(fmt.Sprintf("lock acquired: %s", k))
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locks[k] = true
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defer txn.kv.l.Unlock(k)
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}
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gr, err := txn.kv.Get(txn.ctx, k)
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if err != nil {
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return nil, err
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}
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switch c.Target {
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case pb.Compare_VERSION:
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ver := int64(0)
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if len(gr.Kvs) > 0 {
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ver = gr.Kvs[0].Version
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}
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cv, _ := c.TargetUnion.(*pb.Compare_Version)
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if ver != cv.Version {
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good = false
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}
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case pb.Compare_MOD:
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mod := int64(0)
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if len(gr.Kvs) > 0 {
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mod = gr.Kvs[0].ModRevision
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}
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cv, _ := c.TargetUnion.(*pb.Compare_ModRevision)
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if mod != cv.ModRevision {
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good = false
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}
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default:
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return nil, fmt.Errorf("unknown txn target %v", c.Target)
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}
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trace.Step(fmt.Sprintf("condition key %s good %v", k, good))
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}
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resp.Succeeded = good
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ops := txn.sus
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if !good {
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ops = txn.fas
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}
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for _, op := range ops {
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r, err := txn.do(op)
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if err != nil {
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return nil, err
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}
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resp.Responses = append(resp.Responses, r)
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trace.Step(fmt.Sprintf("op key %s op %v", op.key, op.t))
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}
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return resp, nil
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}
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