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152 lines
3.0 KiB
152 lines
3.0 KiB
// 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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"context"
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"sync"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"google.golang.org/grpc"
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)
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// Txn is the interface that wraps mini-transactions.
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//
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// Txn(context.TODO()).If(
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// Compare(Value(k1), ">", v1),
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// Compare(Version(k1), "=", 2)
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// ).Then(
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// OpPut(k2,v2), OpPut(k3,v3)
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// ).Else(
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// OpPut(k4,v4), OpPut(k5,v5)
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// ).Commit()
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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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isWrite bool
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cmps []*pb.Compare
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sus []*pb.RequestOp
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fas []*pb.RequestOp
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callOpts []grpc.CallOption
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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.isWrite = txn.isWrite || op.isWrite()
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txn.sus = append(txn.sus, op.toRequestOp())
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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.isWrite = txn.isWrite || op.isWrite()
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txn.fas = append(txn.fas, op.toRequestOp())
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}
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return txn
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}
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func (txn *txn) Commit() (*TxnResponse, error) {
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txn.mu.Lock()
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defer txn.mu.Unlock()
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r := &pb.TxnRequest{Compare: txn.cmps, Success: txn.sus, Failure: txn.fas}
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var resp *pb.TxnResponse
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var err error
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resp, err = txn.kv.remote.Txn(txn.ctx, r, txn.callOpts...)
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if err != nil {
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return nil, toErr(txn.ctx, err)
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}
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return (*TxnResponse)(resp), nil
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}
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