logger.go
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/*
Handle the applications logging needs/
Authors:
Georg Hopp <georg@steffers.org>
Changes:
2018-10-02 [Georg Hopp] File created.
Copyright © 2018 Georg Hopp
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package logger
import (
"encoding/json"
"fmt"
"os"
"time"
)
type Severity int
const (
DEBUG Severity = iota
INFO
WARNING
ERROR
FATAL
)
var (
SevStrings = [...]string{
"DEBUG",
"INFO",
"WARNING",
"ERROR",
"FATAL",
}
)
type Logger struct {
logLevel Severity
name string
}
var Default = GetLogger(INFO, "default")
func GetLogger(sev Severity, name string) *Logger {
logger := Logger{sev, name}
return &logger
}
func SevStringToSeverity(sevStr string) (sev Severity) {
switch sevStr {
case SevStrings[DEBUG]:
sev = DEBUG
case SevStrings[INFO]:
sev = INFO
case SevStrings[WARNING]:
sev = WARNING
case SevStrings[FATAL]:
sev = FATAL
case SevStrings[ERROR]:
fallthrough
default:
sev = ERROR
}
return
}
func SeverityToSevString(sev Severity) string {
return SevStrings[sev]
}
func (logger *Logger) SetLevel(level Severity) {
logger.logLevel = level
}
func (logger *Logger) logToJson(
sev Severity, format string, args ...interface{}) string {
message, err := json.Marshal(
logMessage{
time.Now().UTC().Format(time.RFC3339),
logger.name,
sev,
fmt.Sprintf(format, args...),
})
if err != nil {
// TODO Making it fatal if no logging can be done is
// kind of drastic
os.Exit(1)
}
return string(message[:])
}
func (logger *Logger) log(sev Severity, format string, args ...interface{}) {
var output *os.File
if sev >= ERROR {
output = os.Stderr
} else {
output = os.Stdout
}
if sev >= logger.logLevel {
fmt.Fprintln(output, logger.logToJson(sev, format, args...))
}
}
func (logger *Logger) Debug(format string, args ...interface{}) {
logger.log(DEBUG, format, args...)
}
func (logger *Logger) Info(format string, args ...interface{}) {
logger.log(INFO, format, args...)
}
func (logger *Logger) Warning(format string, args ...interface{}) {
logger.log(WARNING, format, args...)
}
func (logger *Logger) Error(format string, args ...interface{}) {
logger.log(ERROR, format, args...)
}
func (logger *Logger) Panic(format string, args ...interface{}) {
logger.log(FATAL, format, args...)
panic(fmt.Sprintf(format, args...))
}
func (logger *Logger) LogError(
err error, format string, args ...interface{}) {
if err != nil {
logger.Error("%s: %s", fmt.Sprintf(format, args...), err)
}
}
func (logger *Logger) FailOnError(
err error, format string, args ...interface{}) {
if err != nil {
logger.Panic("%s: %s", fmt.Sprintf(format, args...), err)
}
}
// vim: ts=4 sts=4 sw=4 noet tw=72: