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pantest.go
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pantest.go
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package main
import (
_ "embed"
"errors"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"runtime"
"sort"
"strings"
"sync"
tm "github.com/buger/goterm"
)
type Status int
// configTemplateBytes contains the default configuration file, ready to be
// used as a template for new files.
//
//go:embed config-template.yml
var configTemplateBytes []byte
const (
NONE Status = iota
STARTING
FAILED
WA
TLE
OK
GENERATING
SAME_OUT
MISMATCH
)
type Event struct {
execIndex int
testIndex int
status Status
msgs []string
}
func (e Event) Exec(index int) Event {
e.execIndex = index
return e
}
func (e Event) Test(index int) Event {
e.testIndex = index
return e
}
func (e Event) Status(status Status) Event {
e.status = status
return e
}
func (e Event) Msg(msg string) Event {
e.msgs = append(e.msgs, msg)
return e
}
func runCli(configFilename string) {
config, err := ParseConfig(configFilename)
if err != nil {
log.Fatal(err)
}
runChecks(config)
}
// initConfigFile creates a new configuration file based on the template.
func initConfigFile(path string) error {
if _, err := os.Stat(path); err == nil {
return fmt.Errorf("file %v already exists", path)
}
if err := os.WriteFile(path, configTemplateBytes, 0666); err != nil {
return fmt.Errorf("failed to write the config file: %w", err)
}
return nil
}
func runChecks(config Config) {
tests, err := getTests(config)
if err != nil {
log.Fatalf("failed to read tests: %v\n", err)
}
tm.Printf("Using %d tests.\n", len(tests))
maxWorkers := decideMaxWorkers(config)
tm.Printf("Using %d max workers.\n", maxWorkers)
tm.Println()
tm.Flush()
events := make(chan Event)
monitorDone := make(chan struct{}, 1)
go func() {
summarizer := NewSummarizer(config.Execs)
ui := NewUI(config.Execs, tests)
ui.InitDisplay()
for event := range events {
summarizer.Ingest(event)
ui.Display(event)
}
tm.Println()
tm.Flush()
// goterm does not seem to handle big strings? Use fmt instead.
fmt.Print(summarizer.Summary(true))
monitorDone <- struct{}{}
}()
var wg sync.WaitGroup
limiter := make(chan struct{}, maxWorkers)
for i := range config.Execs {
wg.Add(1)
go func(index int, exe Exec) {
limiter <- struct{}{}
defer wg.Done()
testExec(exe, tests, Event{execIndex: index}, events)
<-limiter
}(i, config.Execs[i])
}
wg.Wait()
close(events)
<-monitorDone
}
func getTests(config Config) ([]TestCase, error) {
files, err := os.ReadDir(config.InputDir)
if err != nil {
return nil, fmt.Errorf("failed to open input dir: %w", err)
}
tests := make([]TestCase, 0, len(files))
for _, file := range files {
if file.IsDir() || filepath.Ext(file.Name()) != ".in" {
continue
}
testName := strings.TrimSuffix(file.Name(), filepath.Ext(file.Name()))
inPath := filepath.Join(config.InputDir, file.Name())
refPath := filepath.Join(config.RefDir, fmt.Sprintf("%s.ref", testName))
if _, err := os.Stat(refPath); errors.Is(err, os.ErrNotExist) {
tm.Printf("Warning: could not find %s. Skipping...\n", refPath)
tm.Flush()
continue
}
tests = append(tests, TestCase{
name: testName,
inputFilename: inPath,
refFilename: refPath,
})
}
sort.Sort(ByTestNumber(tests))
return tests, nil
}
func decideMaxWorkers(config Config) int {
// Don't allow the checker to use all cores - trust me.
workers := runtime.NumCPU() - 2
if config.MaxWorkers < workers {
workers = config.MaxWorkers
}
if workers < 1 {
workers = 1
}
return workers
}
func testExec(exe Exec, tests []TestCase, baseEvent Event, events chan<- Event) {
for i, test := range tests {
runTest(exe, test, baseEvent.Test(i), events)
}
}
func runTest(exe Exec, test TestCase, baseEvent Event, events chan<- Event) {
events <- baseEvent.Status(STARTING)
inputFile, err := os.Open(test.inputFilename)
if err != nil {
events <- baseEvent.Status(FAILED).Msg(fmt.Sprintf("failed to open input file: %v", err))
return
}
defer inputFile.Close()
refBytes, err := os.ReadFile(test.refFilename)
if err != nil {
events <- baseEvent.Status(FAILED).Msg(fmt.Sprintf("failed to read ref: %v", err))
return
}
outputBytes, err := runProgram(inputFile, exe.Cmd, exe.Timeout)
if err != nil {
if isTimeout(err) {
events <- baseEvent.Status(TLE).Msg(fmt.Sprintf("timed out: %v", err))
} else {
events <- baseEvent.Status(FAILED).Msg(fmt.Sprintf("failed to run: %v", err))
}
return
}
if compatibleOutputs(outputBytes, refBytes) {
events <- baseEvent.Status(OK)
} else {
events <- baseEvent.Status(WA)
}
}
func runProgram(inputFile *os.File, cmdArgs []string, timeout float64) ([]byte, error) {
args := append([]string{fmt.Sprintf("%f", timeout)}, cmdArgs...)
cmd := exec.Command("timeout", args...)
cmd.Stdin = inputFile
return cmd.Output()
}
func isTimeout(err error) bool {
exitError, ok := err.(*exec.ExitError)
return ok && exitError.ExitCode() == 124
}
func compatibleOutputs(out []byte, ref []byte) bool {
linesOut := strings.Split(strings.TrimSpace(string(out)), "\n")
linesRef := strings.Split(strings.TrimSpace(string(ref)), "\n")
if len(linesOut) != len(linesRef) {
return false
}
for i := range linesOut {
if strings.TrimSpace(linesOut[i]) != strings.TrimSpace(linesRef[i]) {
return false
}
}
return true
}