/
worker.go
171 lines (137 loc) · 3.71 KB
/
worker.go
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package judge
import (
"bytes"
"context"
"fmt"
"github.com/mraron/njudge/pkg/language"
"github.com/mraron/njudge/pkg/language/sandbox"
"github.com/mraron/njudge/pkg/problems"
"go.uber.org/multierr"
"go.uber.org/zap"
)
type Worker struct {
id int
sandboxProvider *language.SandboxProvider
}
func NewWorker(id int, sandboxProvider *language.SandboxProvider) *Worker {
return &Worker{id: id, sandboxProvider: sandboxProvider}
}
func (w Worker) Judge(ctx context.Context, plogger *zap.Logger, p problems.Judgeable, src []byte, lang language.Language, c Callbacker) (st problems.Status, err error) {
logger := plogger.With(zap.Int("worker", w.id))
logger.Info("started to judge")
sandboxes := language.NewSandboxProvider()
for i := 0; i < 2; i++ {
var sandbox language.Sandbox
sandbox, err = w.sandboxProvider.Get()
if err != nil {
logger.Error("can't get sandbox", zap.Error(err))
return
}
defer w.sandboxProvider.Put(sandbox)
err = sandbox.Init(zap.NewStdLog(logger))
if err != nil {
return
}
sandboxes.Put(sandbox)
defer func(sandbox language.Sandbox) {
err = multierr.Append(err, sandbox.Cleanup())
}(sandbox)
}
var (
tt problems.TaskType = p.GetTaskType()
stderr bytes.Buffer = bytes.Buffer{}
)
logger.Info("compiling")
compileSandbox := sandboxes.MustGet()
bin, err := tt.Compile(p, compileSandbox, lang, bytes.NewReader(src), &stderr)
sandboxes.Put(compileSandbox)
if err != nil {
logger.Error("compilation error", zap.Error(err))
st.Compiled = false
st.CompilerOutput = err.Error() + "\n" + truncate(stderr.String(), 1024)
return st, nil
}
st.Compiled = true
var (
testNotifier = make(chan string)
statusNotifier = make(chan problems.Status)
errRun error
test string = "1"
waiter = make(chan struct{})
)
go func() {
st, errRun = tt.Run(p, sandboxes, lang, bin, testNotifier, statusNotifier)
waiter <- struct{}{}
}()
for status := range statusNotifier {
test = <-testNotifier
err = c.Callback(Response{test, status, false, ""})
if err != nil {
logger.Error("error while calling callback", zap.Error(err))
return
}
}
<-waiter
err = multierr.Combine(err, errRun)
if err == nil {
logger.Info("successful judging")
} else {
logger.Info("got error while judging", zap.Error(err))
}
return
}
type WorkerProvider interface {
Get() *Worker
Put(*Worker)
}
type IsolateWorkerProvider struct {
minSandboxId, maxSandboxId int
sandboxIdUsed map[int]struct{}
workers chan *Worker
workerCount int
}
func NewIsolateWorkerProvider(minSandboxId, maxSandboxId, workerCount int) (*IsolateWorkerProvider, error) {
wp := &IsolateWorkerProvider{
minSandboxId: minSandboxId,
maxSandboxId: maxSandboxId,
workerCount: workerCount,
workers: make(chan *Worker, workerCount),
sandboxIdUsed: make(map[int]struct{}),
}
for i := 0; i < wp.workerCount; i++ {
provider := language.NewSandboxProvider()
if err := wp.populateProvider(provider, 2); err != nil {
return nil, err
}
wp.workers <- NewWorker(i+1, provider)
}
return wp, nil
}
func (wp *IsolateWorkerProvider) Get() *Worker {
return <-wp.workers
}
func (wp *IsolateWorkerProvider) Put(w *Worker) {
wp.workers <- w
}
func (wp *IsolateWorkerProvider) populateProvider(provider *language.SandboxProvider, cnt int) error {
for i := wp.minSandboxId; i <= wp.maxSandboxId; i++ {
if _, ok := wp.sandboxIdUsed[i]; !ok {
provider.Put(sandbox.NewIsolate(i))
cnt -= 1
wp.sandboxIdUsed[i] = struct{}{}
}
if cnt == 0 {
break
}
}
if cnt != 0 {
return fmt.Errorf("not enough sandboxes")
}
return nil
}
func truncate(s string, to int) string {
if len(s) < to {
return s
}
return s[:to-1] + "..."
}