mirror of
https://github.com/etcd-io/etcd.git
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c26eb3f241
If the grpc connection is restored between an rpc network failure and trying to reestablish the connection, the connection retry would end up resetting good connections if many operations were in-flight at the time of network failure.
165 lines
3.3 KiB
Go
165 lines
3.3 KiB
Go
// Copyright 2016 CoreOS, 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 clientv3
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import (
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"sync"
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"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"golang.org/x/net/context"
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)
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// Txn is the interface that wraps mini-transactions.
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//
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// Tx.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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// TODO: add a Do for shortcut the txn without any condition?
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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.RequestUnion
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fas []*pb.RequestUnion
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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.toRequestUnion())
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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.toRequestUnion())
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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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kv := txn.kv
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for {
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remote := kv.getRemote()
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r := &pb.TxnRequest{Compare: txn.cmps, Success: txn.sus, Failure: txn.fas}
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resp, err := remote.Txn(txn.ctx, r)
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if err == nil {
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return (*TxnResponse)(resp), nil
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}
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if isHaltErr(txn.ctx, err) {
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return nil, rpctypes.Error(err)
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}
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if txn.isWrite {
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go kv.switchRemote(remote, err)
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return nil, rpctypes.Error(err)
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}
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if nerr := kv.switchRemote(remote, err); nerr != nil {
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return nil, nerr
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}
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}
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}
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