mirror of
https://github.com/zrepl/zrepl.git
synced 2024-11-25 09:54:47 +01:00
131 lines
2.6 KiB
Go
131 lines
2.6 KiB
Go
package logger
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import (
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"context"
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"fmt"
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"os"
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"runtime/debug"
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"sync"
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"time"
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)
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const (
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// The field set by WithError function
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FieldError = "err"
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)
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const DefaultUserFieldCapacity = 5
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const InternalErrorPrefix = "github.com/zrepl/zrepl/logger: "
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type Logger struct {
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fields Fields
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outlets Outlets
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outletTimeout time.Duration
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mtx *sync.Mutex
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}
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func NewLogger(outlets Outlets, outletTimeout time.Duration) *Logger {
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return &Logger{
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make(Fields, DefaultUserFieldCapacity),
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outlets,
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outletTimeout,
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&sync.Mutex{},
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}
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}
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func (l *Logger) log(level Level, msg string) {
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l.mtx.Lock()
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defer l.mtx.Unlock()
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entry := Entry{level, msg, time.Now(), l.fields}
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ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(l.outletTimeout))
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ech := make(chan error)
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louts := l.outlets[level]
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for i := range louts {
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go func(ctx context.Context, outlet Outlet, entry Entry) {
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ech <- outlet.WriteEntry(ctx, entry)
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}(ctx, louts[i], entry)
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}
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for fin := 0; fin < len(louts); fin++ {
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select {
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case err := <-ech:
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s outlet error: %s\n", InternalErrorPrefix, err)
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}
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case <-ctx.Done():
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if ctx.Err() == context.DeadlineExceeded {
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fmt.Fprintf(os.Stderr, "%s outlets exceeded deadline, keep waiting anyways", InternalErrorPrefix)
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}
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}
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}
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cancel() // make go vet happy
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}
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func (l *Logger) WithField(field string, val interface{}) *Logger {
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l.mtx.Lock()
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defer l.mtx.Unlock()
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if _, ok := l.fields[field]; ok {
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fmt.Fprintf(os.Stderr, "%s caller overwrites field '%s'. Stack:\n%s\n", InternalErrorPrefix, field, string(debug.Stack()))
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}
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child := &Logger{
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fields: make(Fields, len(l.fields)+1),
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outlets: l.outlets, // cannot be changed after logger initialized
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outletTimeout: l.outletTimeout,
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mtx: l.mtx,
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}
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for k, v := range l.fields {
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child.fields[k] = v
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}
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child.fields[field] = val
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return child
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}
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func (l *Logger) WithFields(fields Fields) (ret *Logger) {
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// TODO optimize
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ret = l
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for field, value := range fields {
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ret = l.WithField(field, value)
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}
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return ret
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}
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func (l *Logger) WithError(err error) *Logger {
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val := interface{}(nil)
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if err != nil {
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val = err.Error()
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}
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return l.WithField(FieldError, val)
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}
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func (l *Logger) Debug(msg string) {
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l.log(Debug, msg)
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}
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func (l *Logger) Info(msg string) {
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l.log(Info, msg)
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}
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func (l *Logger) Warn(msg string) {
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l.log(Warn, msg)
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}
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func (l *Logger) Error(msg string) {
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l.log(Error, msg)
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}
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func (l *Logger) Printf(format string, args ...interface{}) {
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l.log(Error, fmt.Sprintf(format, args...))
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}
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