82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
package logging
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import (
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"errors"
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"fmt"
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"io"
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"os"
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)
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type Backend interface {
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Write(*Record) error
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SetFormatter(*Formatter)
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SetLevel(Level)
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Level() Level
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}
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//
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// Backend to write in file-like objects
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//
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type FileBackend struct {
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l io.Writer
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formatter *Formatter
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level Level
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}
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// Creates a new backend to write the logs on the standard output
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func NewStdoutBackend() (b *FileBackend) {
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b = &FileBackend{
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l: os.Stdout,
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formatter: &defaultFormatter,
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}
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return
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}
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// Creates a new backend to write the logs on the error output
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func NewStderrBackend() (b *FileBackend) {
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b = &FileBackend{
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l: os.Stderr,
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formatter: &defaultFormatter,
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}
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return
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}
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// Creates a new backend to write the logs in a given file
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func NewFileBackend(filename string) (b *FileBackend, e error) {
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filename_fd, err := os.OpenFile(filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
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if err != nil {
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e = errors.New(fmt.Sprintf("Cannot open log file %s (%s)", filename, err.Error()))
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}
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b = &FileBackend{
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l: filename_fd,
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formatter: &defaultFormatter,
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}
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return
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}
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// Creates a new backend to write the logs in a given io.Writer
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func NewIoBackend(buf io.Writer) (b *FileBackend) {
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return &FileBackend{
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l: buf,
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formatter: &defaultFormatter,
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}
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}
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func (b FileBackend) Write(r *Record) error {
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text := (*b.formatter)(r)
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_, err := io.WriteString(b.l, text)
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return err
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}
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func (b *FileBackend) SetLevel(l Level) {
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b.level = l
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}
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func (b *FileBackend) Level() Level {
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return b.level
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}
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func (b *FileBackend) SetFormatter(f *Formatter) {
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b.formatter = f
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}
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