mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-19 11:30:24 +00:00
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
/*
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Copyright 2018 The Kubernetes 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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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 io
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"syscall"
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"testing"
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)
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func writeToPipe(namedPipe string, flaky bool, i int) {
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pipe, err := os.OpenFile(namedPipe, os.O_WRONLY, 0600)
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if err != nil {
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return
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}
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// The first two reads should never be consistent but all
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// subsequent reads should be
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outstr := fmt.Sprintf("Foobar %t", (i <= 0))
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if flaky {
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outstr = fmt.Sprintf("Foobar %d", i)
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}
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pipe.Write([]byte(outstr))
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pipe.Close()
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}
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func makePipe(t *testing.T) string {
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tmp, err := ioutil.TempDir("", "pipe-test")
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if err != nil {
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t.Fatal(err)
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}
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pipe := filepath.Join(tmp, "pipe")
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syscall.Mkfifo(pipe, 0600)
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return pipe
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}
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func writer(namedPipe string, flaky bool, c <-chan int, d <-chan bool) {
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// Make sure something is in the fifo otherwise the first iteration of
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// ConsistentRead will block forever
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writeToPipe(namedPipe, flaky, -1)
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for {
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select {
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case i := <-c:
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writeToPipe(namedPipe, flaky, i)
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case <-d:
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os.RemoveAll(namedPipe)
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return
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}
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}
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}
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func TestConsistentRead(t *testing.T) {
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pipe := makePipe(t)
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prog, done := make(chan int), make(chan bool)
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go writer(pipe, false, prog, done)
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if _, err := consistentReadSync(pipe, 3, func(i int) { prog <- i }); err != nil {
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t.Fatal(err)
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}
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done <- true
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}
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func TestConsistentReadFlakyReader(t *testing.T) {
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pipe := makePipe(t)
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prog, done := make(chan int), make(chan bool)
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go writer(pipe, true, prog, done)
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if _, err := consistentReadSync(pipe, 3, func(i int) { prog <- i }); err == nil {
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t.Fatal("flaky reader returned consistent results")
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}
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}
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