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// Copyright © 2016 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package jwalterweatherman
import (
"fmt"
"io"
"log"
"os"
)
type Threshold int
func (t Threshold) String() string {
return prefixes[t]
}
const (
LevelTrace Threshold = iota
LevelDebug
LevelInfo
LevelWarn
LevelError
LevelCritical
LevelFatal
)
var prefixes map[Threshold]string = map[Threshold]string{
LevelTrace: "TRACE",
LevelDebug: "DEBUG",
LevelInfo: "INFO",
LevelWarn: "WARN",
LevelError: "ERROR",
LevelCritical: "CRITICAL",
LevelFatal: "FATAL",
}
func prefix(t Threshold) string {
return t.String() + " "
}
// Notepad is where you leave a note !
type Notepad struct {
TRACE *log.Logger
DEBUG *log.Logger
INFO *log.Logger
WARN *log.Logger
ERROR *log.Logger
CRITICAL *log.Logger
FATAL *log.Logger
LOG *log.Logger
FEEDBACK *Feedback
loggers []**log.Logger
logHandle io.Writer
outHandle io.Writer
logThreshold Threshold
stdoutThreshold Threshold
prefix string
flags int
// One per Threshold
logCounters [7]*logCounter
}
// NewNotepad create a new notepad.
func NewNotepad(outThreshold Threshold, logThreshold Threshold, outHandle, logHandle io.Writer, prefix string, flags int) *Notepad {
n := &Notepad{}
n.loggers = append(n.loggers, &n.TRACE, &n.DEBUG, &n.INFO, &n.WARN, &n.ERROR, &n.CRITICAL, &n.FATAL)
n.logHandle = logHandle
n.outHandle = outHandle
n.logThreshold = logThreshold
n.stdoutThreshold = outThreshold
if len(prefix) != 0 {
n.prefix = "[" + prefix + "] "
} else {
n.prefix = ""
}
n.flags = flags
n.LOG = log.New(n.logHandle,
"LOG: ",
n.flags)
n.FEEDBACK = &Feedback{n}
n.init()
return n
}
// Feedback is special. It writes plainly to the output while
// logging with the standard extra information (date, file, etc)
// Only Println and Printf are currently provided for this
type Feedback struct {
*Notepad
}
// init create the loggers for each level depending on the notepad thresholds
func (n *Notepad) init() {
bothHandle := io.MultiWriter(n.outHandle, n.logHandle)
for t, logger := range n.loggers {
threshold := Threshold(t)
counter := &logCounter{}
n.logCounters[t] = counter
switch {
case threshold >= n.logThreshold && threshold >= n.stdoutThreshold:
*logger = log.New(io.MultiWriter(counter, bothHandle), n.prefix+prefix(threshold), n.flags)
case threshold >= n.logThreshold:
*logger = log.New(io.MultiWriter(counter, n.logHandle), n.prefix+prefix(threshold), n.flags)
case threshold >= n.stdoutThreshold:
*logger = log.New(io.MultiWriter(counter, os.Stdout), n.prefix+prefix(threshold), n.flags)
default:
*logger = log.New(counter, n.prefix+prefix(threshold), n.flags)
}
}
}
// SetLogThreshold change the threshold above which messages are written to the
// log file
func (n *Notepad) SetLogThreshold(threshold Threshold) {
n.logThreshold = threshold
n.init()
}
// SetLogOutput change the file where log messages are written
func (n *Notepad) SetLogOutput(handle io.Writer) {
n.logHandle = handle
n.init()
}
// GetStdoutThreshold returns the defined Treshold for the log logger.
func (n *Notepad) GetLogThreshold() Threshold {
return n.logThreshold
}
// SetStdoutThreshold change the threshold above which messages are written to the
// standard output
func (n *Notepad) SetStdoutThreshold(threshold Threshold) {
n.stdoutThreshold = threshold
n.init()
}
// GetStdoutThreshold returns the Treshold for the stdout logger.
func (n *Notepad) GetStdoutThreshold() Threshold {
return n.stdoutThreshold
}
// SetPrefix change the prefix used by the notepad. Prefixes are displayed between
// brackets at the begining of the line. An empty prefix won't be displayed at all.
func (n *Notepad) SetPrefix(prefix string) {
if len(prefix) != 0 {
n.prefix = "[" + prefix + "] "
} else {
n.prefix = ""
}
n.init()
}
// SetFlags choose which flags the logger will display (after prefix and message
// level). See the package log for more informations on this.
func (n *Notepad) SetFlags(flags int) {
n.flags = flags
n.init()
}
// Feedback is special. It writes plainly to the output while
// logging with the standard extra information (date, file, etc)
// Only Println and Printf are currently provided for this
func (fb *Feedback) Println(v ...interface{}) {
s := fmt.Sprintln(v...)
fmt.Print(s)
fb.LOG.Output(2, s)
}
// Feedback is special. It writes plainly to the output while
// logging with the standard extra information (date, file, etc)
// Only Println and Printf are currently provided for this
func (fb *Feedback) Printf(format string, v ...interface{}) {
s := fmt.Sprintf(format, v...)
fmt.Print(s)
fb.LOG.Output(2, s)
}
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