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json.go
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json.go
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//
// (C) Copyright 2019 Intel Corporation.
//
// 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.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
package logging
import (
"encoding/json"
"io"
"log"
"runtime"
"time"
)
const (
// Use ISO8601 format for timestamps as it's
// widely supported by parsers (e.g. javascript, etc).
iso8601NoMicro = "2006-01-02T15:04:05Z0700"
iso8601 = "2006-01-02T15:04:05.000000Z0700"
)
type (
// JSONFormatter emits JSON-formatted log output
JSONFormatter struct {
output io.Writer
level string
extra string
flags int
}
logStruct struct {
Level string `json:"level"`
Time string `json:"time"`
Extra string `json:"extra,omitempty"`
Source string `json:"source,omitempty"`
Message string `json:"message"`
}
)
func formatJSONTime(t time.Time, flags int) string {
if flags&log.LUTC != 0 {
t = t.UTC()
}
if flags&log.Lmicroseconds != 0 {
return t.Format(iso8601)
}
return t.Format(iso8601NoMicro)
}
// Output emulates log.Logger's Output(), but formats
// the message as a JSON-structured log entry.
func (f *JSONFormatter) Output(callDepth int, msg string) error {
now := time.Now()
var file string
var line int
if f.flags&(log.Lshortfile|log.Llongfile) != 0 {
var ok bool
_, file, line, ok = runtime.Caller(callDepth)
if !ok {
file = "???"
line = 0
}
}
buf, err := json.Marshal(logStruct{
Time: formatJSONTime(now, f.flags),
Level: f.level,
Extra: f.extra,
Source: formatSource(file, line, f.flags),
Message: msg,
})
if err != nil {
return err
}
if _, err := f.output.Write(buf); err != nil {
return err
}
_, err = f.output.Write([]byte("\n"))
return err
}
// NewJSONFormatter returns a *JSONFormatter configured to
// emit JSON-formatted output.
func NewJSONFormatter(output io.Writer, level, extraData string, flags int) *JSONFormatter {
return &JSONFormatter{
output: output,
level: level,
extra: extraData,
flags: flags,
}
}
type (
jsonDebug interface {
WithJSONOutput() DebugLogger
}
jsonInfo interface {
WithJSONOutput() InfoLogger
}
jsonError interface {
WithJSONOutput() ErrorLogger
}
)
// WithJSONOutput is a convenience method to set all
// logging outputs to the JSON formatter.
func (ll *LeveledLogger) WithJSONOutput() *LeveledLogger {
ll.Lock()
defer ll.Unlock()
var debugLoggers []DebugLogger
var infoLoggers []InfoLogger
var errorLoggers []ErrorLogger
for _, l := range ll.debugLoggers {
if jsonLogger, ok := l.(jsonDebug); ok {
if dl, ok := jsonLogger.WithJSONOutput().(DebugLogger); ok {
debugLoggers = append(debugLoggers, dl)
}
}
}
ll.debugLoggers = debugLoggers
for _, l := range ll.infoLoggers {
if jsonLogger, ok := l.(jsonInfo); ok {
if il, ok := jsonLogger.WithJSONOutput().(InfoLogger); ok {
infoLoggers = append(infoLoggers, il)
}
}
}
ll.infoLoggers = infoLoggers
for _, l := range ll.errorLoggers {
if jsonLogger, ok := l.(jsonError); ok {
if el, ok := jsonLogger.WithJSONOutput().(ErrorLogger); ok {
errorLoggers = append(errorLoggers, el)
}
}
}
ll.errorLoggers = errorLoggers
return ll
}
// WithJSONOutput switches the logger's output to use structured
// JSON formatting.
func (l *DefaultErrorLogger) WithJSONOutput() ErrorLogger {
return &DefaultErrorLogger{
baseLogger{
dest: l.dest,
prefix: l.prefix,
log: NewJSONFormatter(l.dest, "ERROR", l.prefix, errorLogFlags),
},
}
}
// WithJSONOutput switches the logger's output to use structured
// JSON formatting.
func (l *DefaultInfoLogger) WithJSONOutput() InfoLogger {
return &DefaultInfoLogger{
baseLogger{
dest: l.dest,
prefix: l.prefix,
log: NewJSONFormatter(l.dest, "INFO", l.prefix, infoLogFlags),
},
}
}
// WithJSONOutput switches the logger's output to use structured
// JSON formatting.
func (l *DefaultDebugLogger) WithJSONOutput() DebugLogger {
return &DefaultDebugLogger{
baseLogger{
dest: l.dest,
log: NewJSONFormatter(l.dest, "DEBUG", "", debugLogFlags),
},
}
}