98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
package zerolog
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import (
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"io"
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"sync"
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)
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// LevelWriter defines as interface a writer may implement in order
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// to receive level information with payload.
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type LevelWriter interface {
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io.Writer
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WriteLevel(level Level, p []byte) (n int, err error)
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}
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type levelWriterAdapter struct {
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io.Writer
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}
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func (lw levelWriterAdapter) WriteLevel(l Level, p []byte) (n int, err error) {
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return lw.Write(p)
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}
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type syncWriter struct {
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mu sync.Mutex
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lw LevelWriter
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}
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// SyncWriter wraps w so that each call to Write is synchronized with a mutex.
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// This syncer can be used to wrap the call to writer's Write method if it is
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// not thread safe. Note that you do not need this wrapper for os.File Write
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// operations on POSIX and Windows systems as they are already thread-safe.
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func SyncWriter(w io.Writer) io.Writer {
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if lw, ok := w.(LevelWriter); ok {
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return &syncWriter{lw: lw}
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}
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return &syncWriter{lw: levelWriterAdapter{w}}
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}
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// Write implements the io.Writer interface.
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func (s *syncWriter) Write(p []byte) (n int, err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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return s.lw.Write(p)
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}
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// WriteLevel implements the LevelWriter interface.
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func (s *syncWriter) WriteLevel(l Level, p []byte) (n int, err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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return s.lw.WriteLevel(l, p)
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}
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type multiLevelWriter struct {
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writers []LevelWriter
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}
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func (t multiLevelWriter) Write(p []byte) (n int, err error) {
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for _, w := range t.writers {
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if _n, _err := w.Write(p); err == nil {
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n = _n
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if _err != nil {
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err = _err
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} else if _n != len(p) {
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err = io.ErrShortWrite
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}
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}
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}
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return n, err
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}
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func (t multiLevelWriter) WriteLevel(l Level, p []byte) (n int, err error) {
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for _, w := range t.writers {
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if _n, _err := w.WriteLevel(l, p); err == nil {
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n = _n
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if _err != nil {
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err = _err
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} else if _n != len(p) {
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err = io.ErrShortWrite
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}
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}
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}
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return n, err
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}
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// MultiLevelWriter creates a writer that duplicates its writes to all the
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// provided writers, similar to the Unix tee(1) command. If some writers
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// implement LevelWriter, their WriteLevel method will be used instead of Write.
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func MultiLevelWriter(writers ...io.Writer) LevelWriter {
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lwriters := make([]LevelWriter, 0, len(writers))
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for _, w := range writers {
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if lw, ok := w.(LevelWriter); ok {
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lwriters = append(lwriters, lw)
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} else {
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lwriters = append(lwriters, levelWriterAdapter{w})
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}
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}
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return multiLevelWriter{lwriters}
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}
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