82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
/*
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Copyright (c) 2014 VMware, Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package debug
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import (
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"io"
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"os"
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"path"
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)
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// Provider specified the interface types must implement to be used as a
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// debugging sink. Having multiple such sink implementations allows it to be
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// changed externally (for example when running tests).
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type Provider interface {
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NewFile(s string) io.WriteCloser
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Flush()
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}
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var currentProvider Provider = nil
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func SetProvider(p Provider) {
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if currentProvider != nil {
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currentProvider.Flush()
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}
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currentProvider = p
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}
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// Enabled returns whether debugging is enabled or not.
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func Enabled() bool {
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return currentProvider != nil
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}
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// NewFile dispatches to the current provider's NewFile function.
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func NewFile(s string) io.WriteCloser {
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return currentProvider.NewFile(s)
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}
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// Flush dispatches to the current provider's Flush function.
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func Flush() {
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currentProvider.Flush()
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}
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// FileProvider implements a debugging provider that creates a real file for
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// every call to NewFile. It maintains a list of all files that it creates,
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// such that it can close them when its Flush function is called.
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type FileProvider struct {
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Path string
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files []*os.File
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}
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func (fp *FileProvider) NewFile(p string) io.WriteCloser {
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f, err := os.Create(path.Join(fp.Path, p))
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if err != nil {
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panic(err)
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}
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fp.files = append(fp.files, f)
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return f
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}
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func (fp *FileProvider) Flush() {
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for _, f := range fp.files {
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f.Close()
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}
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}
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