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138 lines
4.5 KiB
138 lines
4.5 KiB
package common
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// Need access to internal variables, so can't use _test package
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import (
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"bytes"
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fmt "fmt"
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"io/ioutil"
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"os"
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testing "testing"
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"github.com/stretchr/testify/require"
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)
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func TestWriteFileAtomic(t *testing.T) {
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var (
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data = []byte(RandStr(RandIntn(2048)))
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old = RandBytes(RandIntn(2048))
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perm os.FileMode = 0600
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)
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f, err := ioutil.TempFile("/tmp", "write-atomic-test-")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(f.Name())
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if err = ioutil.WriteFile(f.Name(), old, 0664); err != nil {
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t.Fatal(err)
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}
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if err = WriteFileAtomic(f.Name(), data, perm); err != nil {
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t.Fatal(err)
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}
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rData, err := ioutil.ReadFile(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(data, rData) {
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t.Fatalf("data mismatch: %v != %v", data, rData)
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}
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stat, err := os.Stat(f.Name())
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if err != nil {
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t.Fatal(err)
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}
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if have, want := stat.Mode().Perm(), perm; have != want {
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t.Errorf("have %v, want %v", have, want)
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}
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}
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// This tests atomic write file when there is a single duplicate file.
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// Expected behavior is for a new file to be created, and the original write file to be unaltered.
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func TestWriteFileAtomicDuplicateFile(t *testing.T) {
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var (
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defaultSeed uint64 = 1
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testString = "This is a glorious test string"
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expectedString = "Did the test file's string appear here?"
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fileToWrite = "/tmp/TestWriteFileAtomicDuplicateFile-test.txt"
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)
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// Create a file at the seed, and reset the seed.
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atomicWriteFileRand = defaultSeed
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firstFileRand := randWriteFileSuffix()
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atomicWriteFileRand = defaultSeed
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fname := "/tmp/" + atomicWriteFilePrefix + firstFileRand
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f, err := os.OpenFile(fname, atomicWriteFileFlag, 0777)
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defer os.Remove(fname)
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// Defer here, in case there is a panic in WriteFileAtomic.
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defer os.Remove(fileToWrite)
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require.Nil(t, err)
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f.WriteString(testString)
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WriteFileAtomic(fileToWrite, []byte(expectedString), 0777)
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// Check that the first atomic file was untouched
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firstAtomicFileBytes, err := ioutil.ReadFile(fname)
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require.Nil(t, err, "Error reading first atomic file")
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require.Equal(t, []byte(testString), firstAtomicFileBytes, "First atomic file was overwritten")
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// Check that the resultant file is correct
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resultantFileBytes, err := ioutil.ReadFile(fileToWrite)
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require.Nil(t, err, "Error reading resultant file")
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require.Equal(t, []byte(expectedString), resultantFileBytes, "Written file had incorrect bytes")
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// Check that the intermediate write file was deleted
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// Get the second write files' randomness
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atomicWriteFileRand = defaultSeed
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_ = randWriteFileSuffix()
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secondFileRand := randWriteFileSuffix()
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_, err = os.Stat("/tmp/" + atomicWriteFilePrefix + secondFileRand)
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require.True(t, os.IsNotExist(err), "Intermittent atomic write file not deleted")
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}
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// This tests atomic write file when there are many duplicate files.
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// Expected behavior is for a new file to be created under a completely new seed,
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// and the original write files to be unaltered.
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func TestWriteFileAtomicManyDuplicates(t *testing.T) {
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var (
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defaultSeed uint64 = 2
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testString = "This is a glorious test string, from file %d"
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expectedString = "Did any of the test file's string appear here?"
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fileToWrite = "/tmp/TestWriteFileAtomicDuplicateFile-test.txt"
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)
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// Initialize all of the atomic write files
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atomicWriteFileRand = defaultSeed
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for i := 0; i < atomicWriteFileMaxNumConflicts+2; i++ {
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fileRand := randWriteFileSuffix()
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fname := "/tmp/" + atomicWriteFilePrefix + fileRand
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f, err := os.OpenFile(fname, atomicWriteFileFlag, 0777)
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require.Nil(t, err)
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f.WriteString(fmt.Sprintf(testString, i))
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defer os.Remove(fname)
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}
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atomicWriteFileRand = defaultSeed
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// Defer here, in case there is a panic in WriteFileAtomic.
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defer os.Remove(fileToWrite)
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WriteFileAtomic(fileToWrite, []byte(expectedString), 0777)
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// Check that all intermittent atomic file were untouched
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atomicWriteFileRand = defaultSeed
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for i := 0; i < atomicWriteFileMaxNumConflicts+2; i++ {
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fileRand := randWriteFileSuffix()
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fname := "/tmp/" + atomicWriteFilePrefix + fileRand
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firstAtomicFileBytes, err := ioutil.ReadFile(fname)
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require.Nil(t, err, "Error reading first atomic file")
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require.Equal(t, []byte(fmt.Sprintf(testString, i)), firstAtomicFileBytes,
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"atomic write file %d was overwritten", i)
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}
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// Check that the resultant file is correct
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resultantFileBytes, err := ioutil.ReadFile(fileToWrite)
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require.Nil(t, err, "Error reading resultant file")
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require.Equal(t, []byte(expectedString), resultantFileBytes, "Written file had incorrect bytes")
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}
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