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130 lines
3 KiB
Go
130 lines
3 KiB
Go
// Copyright 2013 The Prometheus Authors
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package testutil
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import (
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"io/ioutil"
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"os"
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)
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const (
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// The base directory used for test emissions, which instructs the operating
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// system to use the default temporary directory as the base or TMPDIR
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// environment variable.
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defaultDirectory = ""
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// NilCloser is a no-op Closer.
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NilCloser = nilCloser(true)
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// The number of times that a TemporaryDirectory will retry its removal
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temporaryDirectoryRemoveRetries = 2
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)
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type (
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// Closer is the interface that wraps the Close method.
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Closer interface {
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// Close reaps the underlying directory and its children. The directory
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// could be deleted by its users already.
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Close()
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}
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nilCloser bool
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// TemporaryDirectory models a closeable path for transient POSIX disk
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// activities.
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TemporaryDirectory interface {
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Closer
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// Path returns the underlying path for access.
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Path() string
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}
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// temporaryDirectory is kept as a private type due to private fields and
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// their interactions.
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temporaryDirectory struct {
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path string
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tester T
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}
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callbackCloser struct {
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fn func()
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}
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// T implements the needed methods of testing.TB so that we do not need
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// to actually import testing (which has the side effect of adding all
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// the test flags, which we do not want in non-test binaries even if
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// they make use of these utilities for some reason).
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T interface {
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Fatal(args ...interface{})
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Fatalf(format string, args ...interface{})
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}
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)
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func (c nilCloser) Close() {
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}
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func (c callbackCloser) Close() {
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c.fn()
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}
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// NewCallbackCloser returns a Closer that calls the provided function upon
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// closing.
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func NewCallbackCloser(fn func()) Closer {
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return &callbackCloser{
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fn: fn,
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}
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}
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func (t temporaryDirectory) Close() {
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retries := temporaryDirectoryRemoveRetries
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err := os.RemoveAll(t.path)
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for err != nil && retries > 0 {
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switch {
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case os.IsNotExist(err):
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err = nil
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default:
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retries--
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err = os.RemoveAll(t.path)
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}
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}
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if err != nil {
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t.tester.Fatal(err)
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}
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}
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func (t temporaryDirectory) Path() string {
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return t.path
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}
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// NewTemporaryDirectory creates a new temporary directory for transient POSIX
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// activities.
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func NewTemporaryDirectory(name string, t T) (handler TemporaryDirectory) {
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var (
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directory string
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err error
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)
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directory, err = ioutil.TempDir(defaultDirectory, name)
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if err != nil {
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t.Fatal(err)
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}
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handler = temporaryDirectory{
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path: directory,
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tester: t,
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}
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return
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}
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