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// Copyright 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package loggo
import (
"fmt"
"io"
"os"
)
// DefaultWriterName is the name of the default writer for
// a Context.
const DefaultWriterName = "default"
// Writer is implemented by any recipient of log messages.
type Writer interface {
// Write writes a message to the Writer with the given level and module
// name. The filename and line hold the file name and line number of the
// code that is generating the log message; the time stamp holds the time
// the log message was generated, and message holds the log message
// itself.
Write(entry Entry)
}
// NewMinLevelWriter returns a Writer that will only pass on the Write calls
// to the provided writer if the log level is at or above the specified
// minimum level.
func NewMinimumLevelWriter(writer Writer, minLevel Level) Writer {
return &minLevelWriter{
writer: writer,
level: minLevel,
}
}
type minLevelWriter struct {
writer Writer
level Level
}
// Write writes the log record.
func (w minLevelWriter) Write(entry Entry) {
if entry.Level < w.level {
return
}
w.writer.Write(entry)
}
type simpleWriter struct {
writer io.Writer
formatter func(entry Entry) string
}
// NewSimpleWriter returns a new writer that writes log messages to the given
// io.Writer formatting the messages with the given formatter.
func NewSimpleWriter(writer io.Writer, formatter func(entry Entry) string) Writer {
if formatter == nil {
formatter = DefaultFormatter
}
return &simpleWriter{writer, formatter}
}
func (simple *simpleWriter) Write(entry Entry) {
logLine := simple.formatter(entry)
fmt.Fprintln(simple.writer, logLine)
}
func defaultWriter() Writer {
return NewSimpleWriter(os.Stderr, DefaultFormatter)
}
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