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call.go
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call.go
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// Copyright 2014 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
//
// Author: Spencer Kimball (spencer.kimball@gmail.com)
package client
import (
"math/rand"
"time"
"github.com/cockroachdb/cockroach/proto"
)
// A Call is a pending database API call.
type Call struct {
Method string // The name of the database command (see api.proto)
Args proto.Request // The argument to the command
Reply proto.Response // The reply from the command
}
// now returns clock.Now() if clock is not nil; otherwise uses the
// system wall time.
func now(clock Clock) int64 {
if clock == nil {
return time.Now().UnixNano()
}
return clock.Now()
}
// resetClientCmdID sets the client command ID if the call is for a
// read-write method. The client command ID provides idempotency
// protection in conjunction with the server.
func (c *Call) resetClientCmdID(clock Clock) {
// On mutating commands, set a client command ID. This prevents
// mutations from being run multiple times on retries.
if proto.IsReadWrite(c.Method) {
c.Args.Header().CmdID = proto.ClientCmdID{
WallTime: now(clock),
Random: rand.Int63(),
}
}
}