1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
|
package zerolog
import (
"bytes"
"io"
"path"
"runtime"
"strconv"
"strings"
"sync"
)
// LevelWriter defines as interface a writer may implement in order
// to receive level information with payload.
type LevelWriter interface {
io.Writer
WriteLevel(level Level, p []byte) (n int, err error)
}
type levelWriterAdapter struct {
io.Writer
}
func (lw levelWriterAdapter) WriteLevel(l Level, p []byte) (n int, err error) {
return lw.Write(p)
}
type syncWriter struct {
mu sync.Mutex
lw LevelWriter
}
// SyncWriter wraps w so that each call to Write is synchronized with a mutex.
// This syncer can be used to wrap the call to writer's Write method if it is
// not thread safe. Note that you do not need this wrapper for os.File Write
// operations on POSIX and Windows systems as they are already thread-safe.
func SyncWriter(w io.Writer) io.Writer {
if lw, ok := w.(LevelWriter); ok {
return &syncWriter{lw: lw}
}
return &syncWriter{lw: levelWriterAdapter{w}}
}
// Write implements the io.Writer interface.
func (s *syncWriter) Write(p []byte) (n int, err error) {
s.mu.Lock()
defer s.mu.Unlock()
return s.lw.Write(p)
}
// WriteLevel implements the LevelWriter interface.
func (s *syncWriter) WriteLevel(l Level, p []byte) (n int, err error) {
s.mu.Lock()
defer s.mu.Unlock()
return s.lw.WriteLevel(l, p)
}
type multiLevelWriter struct {
writers []LevelWriter
}
func (t multiLevelWriter) Write(p []byte) (n int, err error) {
for _, w := range t.writers {
if _n, _err := w.Write(p); err == nil {
n = _n
if _err != nil {
err = _err
} else if _n != len(p) {
err = io.ErrShortWrite
}
}
}
return n, err
}
func (t multiLevelWriter) WriteLevel(l Level, p []byte) (n int, err error) {
for _, w := range t.writers {
if _n, _err := w.WriteLevel(l, p); err == nil {
n = _n
if _err != nil {
err = _err
} else if _n != len(p) {
err = io.ErrShortWrite
}
}
}
return n, err
}
// MultiLevelWriter creates a writer that duplicates its writes to all the
// provided writers, similar to the Unix tee(1) command. If some writers
// implement LevelWriter, their WriteLevel method will be used instead of Write.
func MultiLevelWriter(writers ...io.Writer) LevelWriter {
lwriters := make([]LevelWriter, 0, len(writers))
for _, w := range writers {
if lw, ok := w.(LevelWriter); ok {
lwriters = append(lwriters, lw)
} else {
lwriters = append(lwriters, levelWriterAdapter{w})
}
}
return multiLevelWriter{lwriters}
}
// TestingLog is the logging interface of testing.TB.
type TestingLog interface {
Log(args ...interface{})
Logf(format string, args ...interface{})
Helper()
}
// TestWriter is a writer that writes to testing.TB.
type TestWriter struct {
T TestingLog
// Frame skips caller frames to capture the original file and line numbers.
Frame int
}
// NewTestWriter creates a writer that logs to the testing.TB.
func NewTestWriter(t TestingLog) TestWriter {
return TestWriter{T: t}
}
// Write to testing.TB.
func (t TestWriter) Write(p []byte) (n int, err error) {
t.T.Helper()
n = len(p)
// Strip trailing newline because t.Log always adds one.
p = bytes.TrimRight(p, "\n")
// Try to correct the log file and line number to the caller.
if t.Frame > 0 {
_, origFile, origLine, _ := runtime.Caller(1)
_, frameFile, frameLine, ok := runtime.Caller(1 + t.Frame)
if ok {
erase := strings.Repeat("\b", len(path.Base(origFile))+len(strconv.Itoa(origLine))+3)
t.T.Logf("%s%s:%d: %s", erase, path.Base(frameFile), frameLine, p)
return n, err
}
}
t.T.Log(string(p))
return n, err
}
// ConsoleTestWriter creates an option that correctly sets the file frame depth for testing.TB log.
func ConsoleTestWriter(t TestingLog) func(w *ConsoleWriter) {
return func(w *ConsoleWriter) {
w.Out = TestWriter{T: t, Frame: 6}
}
}
|