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100 lines
3.3 KiB
100 lines
3.3 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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"io"
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"io/ioutil"
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"os"
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"go.uber.org/zap/zapcore"
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"go.uber.org/multierr"
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)
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// Open is a high-level wrapper that takes a variadic number of paths, opens or
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// creates each of the specified files, and combines them into a locked
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// WriteSyncer. It also returns any error encountered and a function to close
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// any opened files.
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//
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// Passing no paths returns a no-op WriteSyncer. The special paths "stdout" and
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// "stderr" are interpreted as os.Stdout and os.Stderr, respectively.
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func Open(paths ...string) (zapcore.WriteSyncer, func(), error) {
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writers, close, err := open(paths)
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if err != nil {
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return nil, nil, err
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}
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writer := CombineWriteSyncers(writers...)
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return writer, close, nil
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}
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func open(paths []string) ([]zapcore.WriteSyncer, func(), error) {
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var openErr error
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writers := make([]zapcore.WriteSyncer, 0, len(paths))
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closers := make([]io.Closer, 0, len(paths))
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close := func() {
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for _, c := range closers {
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c.Close()
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}
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}
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for _, path := range paths {
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sink, err := newSink(path)
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if err == nil {
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// Using a registered sink constructor.
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writers = append(writers, sink)
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closers = append(closers, sink)
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continue
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}
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if _, ok := err.(*errSinkNotFound); ok {
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// No named sink constructor, use key as path to log file.
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f, e := os.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
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openErr = multierr.Append(openErr, e)
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if e == nil {
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writers = append(writers, f)
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closers = append(closers, f)
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}
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continue
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}
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// Sink constructor failed.
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openErr = multierr.Append(openErr, err)
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}
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if openErr != nil {
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close()
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return writers, nil, openErr
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}
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return writers, close, nil
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}
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// CombineWriteSyncers is a utility that combines multiple WriteSyncers into a
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// single, locked WriteSyncer. If no inputs are supplied, it returns a no-op
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// WriteSyncer.
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//
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// It's provided purely as a convenience; the result is no different from
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// using zapcore.NewMultiWriteSyncer and zapcore.Lock individually.
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func CombineWriteSyncers(writers ...zapcore.WriteSyncer) zapcore.WriteSyncer {
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if len(writers) == 0 {
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return zapcore.AddSync(ioutil.Discard)
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}
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return zapcore.Lock(zapcore.NewMultiWriteSyncer(writers...))
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}
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