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raft.go
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raft.go
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// Copyright 2015 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: Ben Darnell
package multiraft
import (
"fmt"
"github.com/cockroachdb/cockroach/util/log"
"github.com/coreos/etcd/raft"
)
// init installs an adapter to use clog for log messages from raft which
// don't belong to any raft group.
func init() {
raft.SetLogger(&raftLogger{})
}
// *clogLogger implements the raft.Logger interface. Note that all methods
// must be defined on the pointer type rather than the value type because
// (at least in the go 1.4 compiler), methods on a value type called through
// an interface pointer go through an additional layer of indirection that
// appears on the stack, and would make all our stack frame offsets incorrect.
//
// Raft is fairly verbose at the "info" level, so we map "info" messages to
// clog.V(1) and "debug" messages to clog.V(2).
//
// This file is named raft.go instead of something like logger.go because this
// file's name is used to determine the vmodule parameter: --vmodule=raft=1
type raftLogger struct {
group uint64
}
func (r *raftLogger) prependContext(format string, v []interface{}) string {
var s string
if r.group != 0 {
v2 := append([]interface{}{r.group}, v...)
s = fmt.Sprintf("[group %d] "+format, v2...)
} else {
s = fmt.Sprintf(format, v...)
}
return s
}
func (*raftLogger) Debug(v ...interface{}) {
if log.V(2) {
log.InfoDepth(1, v...)
}
}
func (r *raftLogger) Debugf(format string, v ...interface{}) {
if log.V(2) {
s := r.prependContext(format, v)
log.InfoDepth(1, s)
}
}
func (*raftLogger) Info(v ...interface{}) {
if log.V(1) {
log.InfoDepth(1, v...)
}
}
func (r *raftLogger) Infof(format string, v ...interface{}) {
if log.V(1) {
s := r.prependContext(format, v)
log.InfoDepth(1, s)
}
}
func (*raftLogger) Warning(v ...interface{}) {
log.WarningDepth(1, v...)
}
func (r *raftLogger) Warningf(format string, v ...interface{}) {
s := r.prependContext(format, v)
log.WarningDepth(1, s)
}
func (*raftLogger) Error(v ...interface{}) {
log.ErrorDepth(1, v...)
}
func (r *raftLogger) Errorf(format string, v ...interface{}) {
s := r.prependContext(format, v)
log.ErrorDepth(1, s)
}
func (*raftLogger) Fatal(v ...interface{}) {
log.FatalDepth(1, v...)
}
func (r *raftLogger) Fatalf(format string, v ...interface{}) {
s := r.prependContext(format, v)
log.FatalDepth(1, s)
}
func (*raftLogger) Panic(v ...interface{}) {
s := fmt.Sprint(v...)
log.ErrorDepth(1, s)
panic(s)
}
func (r *raftLogger) Panicf(format string, v ...interface{}) {
s := r.prependContext(format, v)
log.ErrorDepth(1, s)
panic(s)
}