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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package mlog
import (
"bytes"
"io"
"os"
"sync"
"github.com/mattermost/logr/v2"
"github.com/mattermost/logr/v2/formatters"
"github.com/mattermost/logr/v2/targets"
)
// AddWriterTarget adds a simple io.Writer target to an existing Logger.
// The `io.Writer` can be a buffer which is useful for testing.
// When adding a buffer to collect logs make sure to use `mlog.Buffer` which is
// a thread safe version of `bytes.Buffer`.
func AddWriterTarget(logger *Logger, w io.Writer, useJSON bool, levels ...Level) error {
filter := logr.NewCustomFilter(levels...)
var formatter logr.Formatter
if useJSON {
formatter = &formatters.JSON{EnableCaller: true}
} else {
formatter = &formatters.Plain{EnableCaller: true}
}
target := targets.NewWriterTarget(w)
return logger.log.Logr().AddTarget(target, "_testWriter", filter, formatter, 1000)
}
// CreateConsoleTestLogger creates a logger for unit tests. Log records are output to `os.Stdout`.
// Logs can also be mirrored to the optional `io.Writer`.
func CreateConsoleTestLogger(useJSON bool, level Level) *Logger {
logger, _ := NewLogger()
filter := logr.StdFilter{
Lvl: level,
Stacktrace: LvlPanic,
}
var formatter logr.Formatter
if useJSON {
formatter = &formatters.JSON{EnableCaller: true}
} else {
formatter = &formatters.Plain{EnableCaller: true}
}
target := targets.NewWriterTarget(os.Stdout)
if err := logger.log.Logr().AddTarget(target, "_testcon", filter, formatter, 1000); err != nil {
panic(err)
}
return logger
}
// Buffer provides a thread-safe buffer useful for logging to memory in unit tests.
type Buffer struct {
buf bytes.Buffer
mux sync.Mutex
}
func (b *Buffer) Read(p []byte) (n int, err error) {
b.mux.Lock()
defer b.mux.Unlock()
return b.buf.Read(p)
}
func (b *Buffer) Write(p []byte) (n int, err error) {
b.mux.Lock()
defer b.mux.Unlock()
return b.buf.Write(p)
}
func (b *Buffer) String() string {
b.mux.Lock()
defer b.mux.Unlock()
return b.buf.String()
}
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