forked from nats-io/prometheus-nats-exporter
/
log.go
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/
log.go
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// Copyright 2017-2018 The NATS 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.
package collector
import (
"os"
"sync"
"sync/atomic"
"github.com/nats-io/gnatsd/logger"
)
// Logging in the collector
//
// The collector logger is an instance of a NATS logger based on
// the NATS server logger.
// Logger provides an interface to logging methods.
type Logger interface {
// Log a notice statement
Noticef(format string, v ...interface{})
// Log a fatal error
Fatalf(format string, v ...interface{})
// Log an error
Errorf(format string, v ...interface{})
// Log a debug statement
Debugf(format string, v ...interface{})
// Log a trace statement
Tracef(format string, v ...interface{})
}
// Package globals for performance checks
var trace int32
var debug int32
// The STAN logger, encapsulates a NATS logger
var collectorLog = struct {
sync.Mutex
logger Logger
}{}
// Log Types
const (
ConsoleLogType = iota
SysLogType
RemoteSysLogType
FileLogType
)
// LoggerOptions configure the logger
type LoggerOptions struct {
Debug bool
Trace bool
Logtime bool
LogFile string
LogType int
RemoteSyslog string
}
// ConfigureLogger configures logging for the NATS exporter.
func ConfigureLogger(lOpts *LoggerOptions) {
var newLogger Logger
var opts *LoggerOptions
if lOpts != nil {
opts = lOpts
} else {
opts = &LoggerOptions{}
}
// always log time
opts.Logtime = true
switch opts.LogType {
case FileLogType:
newLogger = logger.NewFileLogger(opts.LogFile, opts.Logtime, opts.Debug, opts.Trace, true)
case RemoteSysLogType:
newLogger = logger.NewRemoteSysLogger(opts.RemoteSyslog, opts.Debug, opts.Trace)
case ConsoleLogType:
colors := true
// Check to see if stderr is being redirected and if so turn off color
// Also turn off colors if we're running on Windows where os.Stderr.Stat() returns an invalid handle-error
stat, err := os.Stderr.Stat()
if err != nil || (stat.Mode()&os.ModeCharDevice) == 0 {
colors = false
}
newLogger = logger.NewStdLogger(opts.Logtime, opts.Debug, opts.Trace, colors, true)
case SysLogType:
newLogger = logger.NewSysLogger(opts.Debug, opts.Trace)
}
if opts.Debug {
atomic.StoreInt32(&debug, 1)
}
if opts.Trace {
atomic.StoreInt32(&trace, 1)
}
collectorLog.Lock()
collectorLog.logger = newLogger
collectorLog.Unlock()
}
// RemoveLogger clears the logger instance and debug/trace flags.
// Used for testing.
func RemoveLogger() {
atomic.StoreInt32(&trace, 0)
atomic.StoreInt32(&debug, 0)
collectorLog.Lock()
collectorLog.logger = nil
collectorLog.Unlock()
}
// Noticef logs a notice statement
func Noticef(format string, v ...interface{}) {
executeLogCall(func(log Logger, format string, v ...interface{}) {
log.Noticef(format, v...)
}, format, v...)
}
// Errorf logs an error
func Errorf(format string, v ...interface{}) {
executeLogCall(func(log Logger, format string, v ...interface{}) {
log.Errorf(format, v...)
}, format, v...)
}
// Fatalf logs a fatal error
func Fatalf(format string, v ...interface{}) {
executeLogCall(func(log Logger, format string, v ...interface{}) {
log.Fatalf(format, v...)
}, format, v...)
}
// Debugf logs a debug statement
// nolint
func Debugf(format string, v ...interface{}) {
if atomic.LoadInt32(&debug) != 0 {
executeLogCall(func(log Logger, format string, v ...interface{}) {
log.Debugf(format, v...)
}, format, v...)
}
}
// Tracef logs a trace statement
// nolint
func Tracef(format string, v ...interface{}) {
if atomic.LoadInt32(&trace) != 0 {
executeLogCall(func(logger Logger, format string, v ...interface{}) {
logger.Tracef(format, v...)
}, format, v...)
}
}
func executeLogCall(f func(logger Logger, format string, v ...interface{}), format string, args ...interface{}) {
collectorLog.Lock()
defer collectorLog.Unlock()
if collectorLog.logger == nil {
return
}
f(collectorLog.logger, format, args...)
}