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273 lines
6.5 KiB
273 lines
6.5 KiB
// Copyright (c) 2016-2019 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package logging
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import (
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"encoding/json"
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"fmt"
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"io"
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"log"
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"strings"
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"time"
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)
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type goLogger struct {
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logger *log.Logger
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level Level
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entryFormatter formatter
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}
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const (
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_LEVEL = "_level"
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_MSG = "_msg"
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_TIME = "_time"
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_RLEVEL = "_rlevel"
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)
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func NewLogger(out io.Writer, lvl Level, fmtLogging LogEntryFormatter, fmtArgs ...interface{}) *goLogger {
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logger := &goLogger{
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logger: log.New(out, "", 0),
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level: lvl,
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}
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if fmtLogging == JSONFORMATTER {
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logger.entryFormatter = &jsonFormatter{}
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} else if fmtLogging == KVFORMATTER {
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logger.entryFormatter = &keyvalueFormatter{}
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} else if fmtLogging == UNIFORMFORMATTER {
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logger.entryFormatter = &uniformFormatter{
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callback: fmtArgs[0].(ComponentCallback),
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}
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} else {
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logger.entryFormatter = &textFormatter{}
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}
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return logger
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}
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// anonymous function variants
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func (gl *goLogger) Loga(level Level, f func() string) {
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if gl.logger == nil {
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return
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}
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if level <= gl.level {
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gl.log(level, NONE, f())
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}
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}
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func (gl *goLogger) Debuga(f func() string) {
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gl.Loga(DEBUG, f)
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}
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func (gl *goLogger) Tracea(f func() string) {
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gl.Loga(TRACE, f)
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}
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func (gl *goLogger) Requesta(rlevel Level, f func() string) {
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if gl.logger == nil {
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return
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}
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if REQUEST <= gl.level {
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gl.log(REQUEST, rlevel, f())
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}
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}
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func (gl *goLogger) Infoa(f func() string) {
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gl.Loga(INFO, f)
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}
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func (gl *goLogger) Warna(f func() string) {
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gl.Loga(WARN, f)
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}
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func (gl *goLogger) Errora(f func() string) {
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gl.Loga(ERROR, f)
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}
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func (gl *goLogger) Severea(f func() string) {
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gl.Loga(SEVERE, f)
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}
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func (gl *goLogger) Fatala(f func() string) {
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gl.Loga(FATAL, f)
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}
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// printf-style variants
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func (gl *goLogger) Logf(level Level, format string, args ...interface{}) {
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if gl.logger == nil {
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return
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}
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if level <= gl.level {
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gl.log(level, NONE, fmt.Sprintf(format, args...))
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}
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}
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func (gl *goLogger) Debugf(format string, args ...interface{}) {
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gl.Logf(DEBUG, format, args...)
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}
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func (gl *goLogger) Tracef(format string, args ...interface{}) {
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gl.Logf(TRACE, format, args...)
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}
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func (gl *goLogger) Requestf(rlevel Level, format string, args ...interface{}) {
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if gl.logger == nil {
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return
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}
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if REQUEST <= gl.level {
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gl.log(REQUEST, rlevel, fmt.Sprintf(format, args...))
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}
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}
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func (gl *goLogger) Infof(format string, args ...interface{}) {
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gl.Logf(INFO, format, args...)
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}
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func (gl *goLogger) Warnf(format string, args ...interface{}) {
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gl.Logf(WARN, format, args...)
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}
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func (gl *goLogger) Errorf(format string, args ...interface{}) {
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gl.Logf(ERROR, format, args...)
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}
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func (gl *goLogger) Severef(format string, args ...interface{}) {
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gl.Logf(SEVERE, format, args...)
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}
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func (gl *goLogger) Fatalf(format string, args ...interface{}) {
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gl.Logf(FATAL, format, args...)
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}
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func (gl *goLogger) Level() Level {
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return gl.level
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}
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func (gl *goLogger) SetLevel(level Level) {
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gl.level = level
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}
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func (gl *goLogger) log(level Level, rlevel Level, msg string) {
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tm := time.Now().Format("2006-01-02T15:04:05.000-07:00") // time.RFC3339 with milliseconds
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gl.logger.Print(gl.entryFormatter.format(tm, level, rlevel, msg))
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}
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type formatter interface {
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format(string, Level, Level, string) string
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}
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type textFormatter struct {
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}
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// ex. 2016-02-10T09:15:25.498-08:00 [INFO] This is a message from test in text format
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func (*textFormatter) format(tm string, level Level, rlevel Level, msg string) string {
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b := &strings.Builder{}
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appendValue(b, tm)
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if rlevel != NONE {
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fmt.Fprintf(b, "[%s,%s] ", level.String(), rlevel.String())
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} else {
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fmt.Fprintf(b, "[%s] ", level.String())
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}
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appendValue(b, msg)
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b.WriteByte('\n')
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return b.String()
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}
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func appendValue(b *strings.Builder, value interface{}) {
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if _, ok := value.(string); ok {
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fmt.Fprintf(b, "%s ", value)
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} else {
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fmt.Fprintf(b, "%v ", value)
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}
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}
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type keyvalueFormatter struct {
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}
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// ex. _time=2016-02-10T09:15:25.498-08:00 _level=INFO _msg=This is a message from test in key-value format
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func (*keyvalueFormatter) format(tm string, level Level, rlevel Level, msg string) string {
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b := &strings.Builder{}
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appendKeyValue(b, _TIME, tm)
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appendKeyValue(b, _LEVEL, level.String())
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if rlevel != NONE {
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appendKeyValue(b, _RLEVEL, rlevel.String())
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}
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appendKeyValue(b, _MSG, msg)
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b.WriteByte('\n')
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return b.String()
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}
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func appendKeyValue(b *strings.Builder, key, value interface{}) {
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if _, ok := value.(string); ok {
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fmt.Fprintf(b, "%v=%s ", key, value)
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} else {
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fmt.Fprintf(b, "%v=%v ", key, value)
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}
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}
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type jsonFormatter struct {
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}
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// ex. {"_level":"INFO","_msg":"This is a message from test in json format","_time":"2016-02-10T09:12:59.518-08:00"}
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func (*jsonFormatter) format(tm string, level Level, rlevel Level, msg string) string {
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data := make(map[string]interface{}, 4)
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data[_TIME] = tm
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data[_LEVEL] = level.String()
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if rlevel != NONE {
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data[_RLEVEL] = rlevel.String()
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}
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data[_MSG] = msg
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serialized, _ := json.Marshal(data)
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var b strings.Builder
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b.Write(serialized)
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b.WriteByte('\n')
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return b.String()
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}
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type ComponentCallback func() string
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type uniformFormatter struct {
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callback ComponentCallback
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}
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// ex. 2019-03-15T11:28:07.652-04:00 DEBU COMPONENT.subcomponent This is a message from test in uniform format
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var _LEVEL_UNIFORM = []string{
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DEBUG: "DEBU",
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TRACE: "TRAC",
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REQUEST: "REQU",
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INFO: "INFO",
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WARN: "WARN",
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ERROR: "ERRO",
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SEVERE: "SEVE",
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FATAL: "FATA",
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NONE: "NONE",
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}
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func (level Level) UniformString() string {
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return _LEVEL_UNIFORM[level]
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}
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func (uf *uniformFormatter) format(tm string, level Level, rlevel Level, msg string) string {
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b := &strings.Builder{}
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appendValue(b, tm)
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component := uf.callback()
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if rlevel != NONE {
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// not really any accommodation for a composite level in the uniform standard; just output as abbr,abbr
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fmt.Fprintf(b, "%s,%s %s ", level.UniformString(), rlevel.UniformString(), component)
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} else {
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fmt.Fprintf(b, "%s %s ", level.UniformString(), component)
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}
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appendValue(b, msg)
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b.WriteByte('\n')
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return b.String()
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}
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