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docs: add docs for logx (#1960)

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2022-06-03 19:11:06 +08:00
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<img align="right" width="150px" src="https://raw.githubusercontent.com/zeromicro/zero-doc/main/doc/images/go-zero.png">
# logx
English | [简体中文](readme-cn.md)
## logx configurations
```go
type LogConf struct {
ServiceName string `json:",optional"`
Mode string `json:",default=console,options=[console,file,volume]"`
Encoding string `json:",default=json,options=[json,plain]"`
TimeFormat string `json:",optional"`
Path string `json:",default=logs"`
Level string `json:",default=info,options=[info,error,severe]"`
Compress bool `json:",optional"`
KeepDays int `json:",optional"`
StackCooldownMillis int `json:",default=100"`
}
```
- `ServiceName`: set the service name, optional. on `volume` mode, the name is used to generate the log files. Within `rest/zrpc` services, the name will be set to the name of `rest` or `zrpc` automatically.
- `Mode`: the mode to output the logs, default is `console`.
- `console` mode writes the logs to `stdout/stderr`.
- `file` mode writes the logs to the files specified by `Path`.
- `volume` mode is used in docker, to write logs into mounted volumes.
- `Encoding`: indicates how to encode the logs, default is `json`.
- `json` mode writes the logs in json format.
- `plain` mode writes the logs with plain text, with terminal color enabled.
- `TimeFormat`: customize the time format, optional. Default is `2006-01-02T15:04:05.000Z07:00`.
- `Path`: set the log path, default to `logs`.
- `Level`: the logging level to filter logs. Default is `info`.
- `info`, all logs are written.
- `error`, `info` logs are suppressed.
- `severe`, `info` and `error` logs are suppressed, only `severe` logs are written.
- `Compress`: whether or not to compress log files, only works with `file` mode.
- `KeepDays`: how many days that the log files are kept, after the given days, the outdated files will be deleted automatically. It has no effect on `console` mode.
- `StackCooldownMillis`: how many milliseconds to rewrite stacktrace again. It’s used to avoid stacktrace flooding.
## Logging methods
```go
type Logger interface {
// Error logs a message at error level.
Error(...interface{})
// Errorf logs a message at error level.
Errorf(string, ...interface{})
// Errorv logs a message at error level.
Errorv(interface{})
// Errorw logs a message at error level.
Errorw(string, ...LogField)
// Info logs a message at info level.
Info(...interface{})
// Infof logs a message at info level.
Infof(string, ...interface{})
// Infov logs a message at info level.
Infov(interface{})
// Infow logs a message at info level.
Infow(string, ...LogField)
// Slow logs a message at slow level.
Slow(...interface{})
// Slowf logs a message at slow level.
Slowf(string, ...interface{})
// Slowv logs a message at slow level.
Slowv(interface{})
// Sloww logs a message at slow level.
Sloww(string, ...LogField)
// WithContext returns a new logger with the given context.
WithContext(context.Context) Logger
// WithDuration returns a new logger with the given duration.
WithDuration(time.Duration) Logger
}
```
- `Error`, `Info`, `Slow`: write any kind of messages into logs, with like `fmt.Sprint(…)`.
- `Errorf`, `Infof`, `Slowf`: write messages with given format into logs.
- `Errorv`, `Infov`, `Slowv`: write any kind of messages into logs, with json marshalling to encode them.
- `Errorw`, `Infow`, `Sloww`: write the string message with given `key:value` fields.
- `WithContext`: inject the given ctx into the log messages, typically used to log `trace-id` and `span-id`.
- `WithDuration`: write elapsed duration into the log messages, with key `duration`.
## Integrating with third-party logging libs
- zap
- implementation: [https://github.com/zeromicro/zero-contrib/blob/main/logx/zapx/zap.go](https://github.com/zeromicro/zero-contrib/blob/main/logx/zapx/zap.go)
- usage example: [https://github.com/zeromicro/zero-examples/blob/main/logx/zaplog/main.go](https://github.com/zeromicro/zero-examples/blob/main/logx/zaplog/main.go)
- logrus
- implementation: [https://github.com/zeromicro/zero-contrib/blob/main/logx/logrusx/logrus.go](https://github.com/zeromicro/zero-contrib/blob/main/logx/logrusx/logrus.go)
- usage example: [https://github.com/zeromicro/zero-examples/blob/main/logx/logrus/main.go](https://github.com/zeromicro/zero-examples/blob/main/logx/logrus/main.go)
For more libs, please implement and PR to [https://github.com/zeromicro/zero-contrib](https://github.com/zeromicro/zero-contrib)
## Write the logs to specific stores
`logx` defined two interfaces to let you customize `logx` to write logs into any stores.
- `logx.NewWriter(w io.Writer)`
- `logx.SetWriter(writer logx.Writer)`
For example, if we want to write the logs into kafka instead of console or files, we can do it like below:
```go
type KafkaWriter struct {
Pusher *kq.Pusher
}
func NewKafkaWriter(pusher *kq.Pusher) *KafkaWriter {
return &KafkaWriter{
Pusher: pusher,
}
}
func (w *KafkaWriter) Write(p []byte) (n int, err error) {
// writing log with newlines, trim them.
if err := w.Pusher.Push(strings.TrimSpace(string(p))); err != nil {
return 0, err
}
return len(p), nil
}
func main() {
func main() {
pusher := kq.NewPusher([]string{"localhost:9092"}, "go-zero")
defer pusher.Close()
writer := logx.NewWriter(NewKafkaWriter(pusher))
logx.SetWriter(writer)
// more code
}
```
Complete code: [https://github.com/zeromicro/zero-examples/blob/main/logx/tokafka/main.go](https://github.com/zeromicro/zero-examples/blob/main/logx/tokafka/main.go)
## Filtering sensitive fields
If we need to prevent the `password` fields from logging, we can do it like below:
```go
type (
Message struct {
Name string
Password string
Message string
}
SensitiveLogger struct {
logx.Writer
}
)
func NewSensitiveLogger(writer logx.Writer) *SensitiveLogger {
return &SensitiveLogger{
Writer: writer,
}
}
func (l *SensitiveLogger) Info(msg interface{}, fields ...logx.LogField) {
if m, ok := msg.(Message); ok {
l.Writer.Info(Message{
Name: m.Name,
Password: "******",
Message: m.Message,
}, fields...)
} else {
l.Writer.Info(msg, fields...)
}
}
func main() {
// setup logx to make sure originalWriter not nil,
// the injected writer is only for filtering, like a middleware.
originalWriter := logx.Reset()
writer := NewSensitiveLogger(originalWriter)
logx.SetWriter(writer)
logx.Infov(Message{
Name: "foo",
Password: "shouldNotAppear",
Message: "bar",
})
// more code
}
```
Complete code: [https://github.com/zeromicro/zero-examples/blob/main/logx/filterfields/main.go](https://github.com/zeromicro/zero-examples/blob/main/logx/filterfields/main.go)
## More examples
[https://github.com/zeromicro/zero-examples/tree/main/logx](https://github.com/zeromicro/zero-examples/tree/main/logx)
## Give a Star! ⭐
If you like or are using this project to learn or start your solution, please give it a star. Thanks!