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minilog.go
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minilog.go
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// Copyright (2012) Sandia Corporation.
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// David Fritz <djfritz@sandia.gov>
// Devin Cook <devcook@sandia.gov>
// minilog extends Go's logging functionality to allow for multiple
// loggers, each one with their own logging level. To use minilog, call
// AddLogger() to set up each desired logger, then use the package-level
// logging functions defined to send messages to all defined loggers.
package minilog
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
golog "log"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
)
var (
loggers = make(map[string]*minilogger)
logLock sync.RWMutex
)
var (
colorLine = FgYellow
colorDebug = FgBlue
colorInfo = FgGreen
colorWarn = FgYellow
colorError = FgRed
colorFatal = FgRed
)
const DefaultLevel = ERROR
var (
LevelFlag = DefaultLevel
VerboseFlag bool
FileFlag string
)
func init() {
// Add non-builtin flag type
flag.Var(&LevelFlag, "level", "set log level: [debug, info, warn, error, fatal]")
flag.BoolVar(&VerboseFlag, "v", true, "log on stderr")
flag.BoolVar(&VerboseFlag, "verbose", true, "log on stderr")
flag.StringVar(&FileFlag, "logfile", "", "specify file to log to")
}
// Adds a logger set to log only events at level specified or higher.
// output: io.Writer instance to which to log (can be os.Stderr or os.Stdout)
// level: one of the minilogging levels defined as a constant
func AddLogger(name string, output io.Writer, level Level, color bool) {
logLock.Lock()
defer logLock.Unlock()
loggers[name] = &minilogger{golog.New(output, "", golog.LstdFlags), level, color, nil}
}
func AddLogRing(name string, l *Ring, level Level) {
logLock.Lock()
defer logLock.Unlock()
loggers[name] = &minilogger{
logger: l,
Level: level,
}
}
// Remove a named logger that was added using AddLogger
func DelLogger(name string) {
logLock.Lock()
defer logLock.Unlock()
delete(loggers, name)
}
func Loggers() []string {
logLock.Lock()
defer logLock.Unlock()
var ret []string
for k, _ := range loggers {
ret = append(ret, k)
}
return ret
}
// WillLog returns true if logging to a specific log level will result in
// actual logging. Useful if the logging text itself is expensive to produce.
func WillLog(level Level) bool {
logLock.Lock()
defer logLock.Unlock()
for _, v := range loggers {
if v.Level <= level {
return true
}
}
return false
}
// Change a log level for a named logger.
func SetLevel(name string, level Level) error {
logLock.Lock()
defer logLock.Unlock()
if loggers[name] == nil {
return errors.New("logger does not exist")
}
loggers[name].Level = level
return nil
}
// SetLevelAll changes the log level for all loggers to the provided level
func SetLevelAll(level Level) {
logLock.Lock()
defer logLock.Unlock()
for _, logger := range loggers {
logger.Level = level
}
}
// Return the log level for a named logger.
func GetLevel(name string) (Level, error) {
logLock.Lock()
defer logLock.Unlock()
if loggers[name] == nil {
return -1, errors.New("logger does not exist")
}
return loggers[name].Level, nil
}
// Log all input from an io.Reader, splitting on lines, until EOF. LogAll
// starts a goroutine and returns immediately.
func LogAll(i io.Reader, level Level, name string) {
go func(i io.Reader, level Level, name string) {
r := bufio.NewReader(i)
for {
d, err := r.ReadString('\n')
if d := strings.TrimSpace(d); d != "" {
log(level, name, d)
}
if level == FATAL {
os.Exit(1)
}
if err != nil {
break
}
}
}(i, level, name)
}
// Setup log according to flags and OS.
// Replaces the logSetup() that each package used to have.
func Init() {
color := true
if runtime.GOOS == "windows" {
color = false
}
if VerboseFlag {
AddLogger("stderr", os.Stderr, LevelFlag, color)
}
if FileFlag != "" {
err := os.MkdirAll(filepath.Dir(FileFlag), 0755)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
logfile, err := os.OpenFile(FileFlag, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
AddLogger("file", logfile, LevelFlag, false)
}
}
func Filters(name string) ([]string, error) {
logLock.Lock()
defer logLock.Unlock()
if l, ok := loggers[name]; ok {
var ret = make([]string, len(l.filters))
copy(ret, l.filters)
return ret, nil
} else {
return nil, fmt.Errorf("no such logger %v", name)
}
}
func AddFilter(name string, filter string) error {
logLock.Lock()
defer logLock.Unlock()
if l, ok := loggers[name]; ok {
for _, f := range l.filters {
if f == filter {
return nil
}
}
l.filters = append(l.filters, filter)
} else {
return fmt.Errorf("no such logger %v", name)
}
return nil
}
func DelFilter(name string, filter string) error {
logLock.Lock()
defer logLock.Unlock()
if l, ok := loggers[name]; ok {
for i, f := range l.filters {
if f == filter {
l.filters = append(l.filters[:i], l.filters[i+1:]...)
return nil
}
}
return fmt.Errorf("filter %v does not exist", filter)
} else {
return fmt.Errorf("no such logger %v", name)
}
}
func log(level Level, name, format string, arg ...interface{}) {
logLock.RLock()
defer logLock.RUnlock()
for _, logger := range loggers {
if logger.Level <= level {
logger.log(level, name, format, arg...)
}
}
}
func logln(level Level, name string, arg ...interface{}) {
logLock.Lock()
defer logLock.Unlock()
for _, logger := range loggers {
if logger.Level <= level {
logger.logln(level, name, arg...)
}
}
}
func Debug(format string, arg ...interface{}) {
log(DEBUG, "", format, arg...)
}
func Info(format string, arg ...interface{}) {
log(INFO, "", format, arg...)
}
func Warn(format string, arg ...interface{}) {
log(WARN, "", format, arg...)
}
func Error(format string, arg ...interface{}) {
log(ERROR, "", format, arg...)
}
func Fatal(format string, arg ...interface{}) {
log(FATAL, "", format, arg...)
os.Exit(1)
}
func Debugln(arg ...interface{}) {
logln(DEBUG, "", arg...)
}
func Infoln(arg ...interface{}) {
logln(INFO, "", arg...)
}
func Warnln(arg ...interface{}) {
logln(WARN, "", arg...)
}
func Errorln(arg ...interface{}) {
logln(ERROR, "", arg...)
}
func Fatalln(arg ...interface{}) {
logln(FATAL, "", arg...)
os.Exit(1)
}