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persist.go
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/
persist.go
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// Copyright 2020 Gregory Petrosyan <gregory.petrosyan@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
package rapid
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"unicode"
)
const (
rapidVersion = "v0.4.8"
persistDirMode = 0775
failfileTmpPattern = ".rapid-failfile-tmp-*"
)
func kindaSafeFilename(f string) string {
var s strings.Builder
for _, r := range f {
if unicode.IsLetter(r) || unicode.IsDigit(r) || r == '-' || r == '_' {
s.WriteRune(r)
} else {
s.WriteRune('_')
}
}
return s.String()
}
func failFileName(testName string) (string, string) {
ts := time.Now().Format("20060102150405")
fileName := fmt.Sprintf("%s-%s-%d.fail", kindaSafeFilename(testName), ts, os.Getpid())
dirName := filepath.Join("testdata", "rapid", kindaSafeFilename(testName))
return dirName, filepath.Join(dirName, fileName)
}
func saveFailFile(filename string, version string, output []byte, seed uint64, buf []uint64) error {
dir := filepath.Dir(filename)
err := os.MkdirAll(dir, persistDirMode)
if err != nil {
return fmt.Errorf("failed to create directory for fail file %q: %w", filename, err)
}
f, err := ioutil.TempFile(dir, failfileTmpPattern)
if err != nil {
return fmt.Errorf("failed to create temporary file for fail file %q: %w", filename, err)
}
defer func() { _ = os.Remove(f.Name()) }()
defer func() { _ = f.Close() }()
out := strings.Split(string(output), "\n")
for _, s := range out {
_, err := f.WriteString("# " + s + "\n")
if err != nil {
return fmt.Errorf("failed to write data to fail file %q: %w", filename, err)
}
}
bs := []string{fmt.Sprintf("%v#%v", version, seed)}
for _, u := range buf {
bs = append(bs, fmt.Sprintf("0x%x", u))
}
_, err = f.WriteString(strings.Join(bs, "\n"))
if err != nil {
return fmt.Errorf("failed to write data to fail file %q: %w", filename, err)
}
_ = f.Close() // early close, otherwise os.Rename will fail on Windows
err = os.Rename(f.Name(), filename)
if err != nil {
return fmt.Errorf("failed to save fail file %q: %w", filename, err)
}
return nil
}
func loadFailFile(filename string) (string, uint64, []uint64, error) {
f, err := os.Open(filename)
if err != nil {
return "", 0, nil, fmt.Errorf("failed to open fail file: %w", err)
}
defer func() { _ = f.Close() }()
var data []string
scanner := bufio.NewScanner(f)
for scanner.Scan() {
s := strings.TrimSpace(scanner.Text())
if strings.HasPrefix(s, "#") || s == "" {
continue
}
data = append(data, s)
}
if err := scanner.Err(); err != nil {
return "", 0, nil, fmt.Errorf("failed to load fail file %q: %w", filename, err)
}
if len(data) == 0 {
return "", 0, nil, fmt.Errorf("no data in fail file %q", filename)
}
split := strings.Split(data[0], "#")
if len(split) != 2 {
return "", 0, nil, fmt.Errorf("invalid version/seed field %q in %q", data[0], filename)
}
seed, err := strconv.ParseUint(split[1], 10, 64)
if err != nil {
return "", 0, nil, fmt.Errorf("invalid seed %q in %q", split[1], filename)
}
var buf []uint64
for _, b := range data[1:] {
u, err := strconv.ParseUint(b, 0, 64)
if err != nil {
return "", 0, nil, fmt.Errorf("failed to load fail file %q: %w", filename, err)
}
buf = append(buf, u)
}
return split[0], seed, buf, nil
}