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94 lines
2.7 KiB
94 lines
2.7 KiB
// Copyright (c) 2016 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package zap
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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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"sync"
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"go.uber.org/zap/zapcore"
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)
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var (
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_sinkMutex sync.RWMutex
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_sinkFactories map[string]func() (Sink, error)
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)
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func init() {
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resetSinkRegistry()
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}
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func resetSinkRegistry() {
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_sinkMutex.Lock()
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defer _sinkMutex.Unlock()
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_sinkFactories = map[string]func() (Sink, error){
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"stdout": func() (Sink, error) { return nopCloserSink{os.Stdout}, nil },
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"stderr": func() (Sink, error) { return nopCloserSink{os.Stderr}, nil },
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}
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}
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type errSinkNotFound struct {
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key string
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}
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func (e *errSinkNotFound) Error() string {
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return fmt.Sprintf("no sink found for %q", e.key)
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}
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// Sink defines the interface to write to and close logger destinations.
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type Sink interface {
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zapcore.WriteSyncer
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io.Closer
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}
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// RegisterSink adds a Sink at the given key so it can be referenced
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// in config OutputPaths.
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func RegisterSink(key string, sinkFactory func() (Sink, error)) error {
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_sinkMutex.Lock()
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defer _sinkMutex.Unlock()
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if key == "" {
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return errors.New("sink key cannot be blank")
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}
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if _, ok := _sinkFactories[key]; ok {
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return fmt.Errorf("sink already registered for key %q", key)
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}
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_sinkFactories[key] = sinkFactory
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return nil
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}
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// newSink invokes the registered sink factory to create and return the
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// sink for the given key. Returns errSinkNotFound if the key cannot be found.
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func newSink(key string) (Sink, error) {
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_sinkMutex.RLock()
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defer _sinkMutex.RUnlock()
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sinkFactory, ok := _sinkFactories[key]
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if !ok {
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return nil, &errSinkNotFound{key}
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}
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return sinkFactory()
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}
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type nopCloserSink struct{ zapcore.WriteSyncer }
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func (nopCloserSink) Close() error { return nil }
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