93 lines
2.9 KiB
Markdown
93 lines
2.9 KiB
Markdown
## Golang logging library
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[](https://godoc.org/github.com/op/go-logging) [](https://travis-ci.org/op/go-logging)
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Package logging implements a logging infrastructure for Go. Its output format
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is customizable and supports different logging backends like syslog, file and
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memory. Multiple backends can be utilized with different log levels per backend
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and logger.
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**_NOTE:_** backwards compatibility promise have been dropped for master. Please
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vendor this package or use `gopkg.in/op/go-logging.v1` for previous version. See
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[changelog](CHANGELOG.md) for details.
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## Example
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Let's have a look at an [example](examples/example.go) which demonstrates most
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of the features found in this library.
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[](examples/example.go)
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```go
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package main
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import (
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"os"
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"github.com/op/go-logging"
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)
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var log = logging.MustGetLogger("example")
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// Example format string. Everything except the message has a custom color
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// which is dependent on the log level. Many fields have a custom output
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// formatting too, eg. the time returns the hour down to the milli second.
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var format = logging.MustStringFormatter(
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`%{color}%{time:15:04:05.000} %{shortfunc} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}`,
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)
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// Password is just an example type implementing the Redactor interface. Any
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// time this is logged, the Redacted() function will be called.
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type Password string
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func (p Password) Redacted() interface{} {
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return logging.Redact(string(p))
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}
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func main() {
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// For demo purposes, create two backend for os.Stderr.
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backend1 := logging.NewLogBackend(os.Stderr, "", 0)
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backend2 := logging.NewLogBackend(os.Stderr, "", 0)
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// For messages written to backend2 we want to add some additional
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// information to the output, including the used log level and the name of
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// the function.
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backend2Formatter := logging.NewBackendFormatter(backend2, format)
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// Only errors and more severe messages should be sent to backend1
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backend1Leveled := logging.AddModuleLevel(backend1)
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backend1Leveled.SetLevel(logging.ERROR, "")
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// Set the backends to be used.
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logging.SetBackend(backend1Leveled, backend2Formatter)
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log.Debugf("debug %s", Password("secret"))
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log.Info("info")
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log.Notice("notice")
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log.Warning("warning")
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log.Error("err")
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log.Critical("crit")
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}
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```
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## Installing
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### Using *go get*
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$ go get github.com/op/go-logging
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After this command *go-logging* is ready to use. Its source will be in:
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$GOPATH/src/pkg/github.com/op/go-logging
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You can use `go get -u` to update the package.
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## Documentation
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For docs, see http://godoc.org/github.com/op/go-logging or run:
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$ godoc github.com/op/go-logging
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## Additional resources
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* [wslog](https://godoc.org/github.com/cryptix/exp/wslog) -- exposes log messages through a WebSocket.
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