import hmac import json import logging import threading import time from collections import deque, namedtuple from operator import itemgetter from django import db from django.conf import settings from django.utils import timezone from django.db.models import F from judge import event_poster as event from judge.bridge.base_handler import ZlibPacketHandler, proxy_list from judge.caching import finished_submission from judge.models import ( Judge, Language, LanguageLimit, Problem, RuntimeVersion, Submission, SubmissionTestCase, ) logger = logging.getLogger("judge.bridge") json_log = logging.getLogger("judge.json.bridge") UPDATE_RATE_LIMIT = 5 UPDATE_RATE_TIME = 0.5 SubmissionData = namedtuple( "SubmissionData", "time memory short_circuit pretests_only contest_no attempt_no user_id", ) def _ensure_connection(): try: db.connection.cursor().execute("SELECT 1").fetchall() except Exception: db.connection.close() class JudgeHandler(ZlibPacketHandler): proxies = proxy_list(settings.BRIDGED_JUDGE_PROXIES or []) def __init__(self, request, client_address, server, judges): super().__init__(request, client_address, server) self.judges = judges self.handlers = { "grading-begin": self.on_grading_begin, "grading-end": self.on_grading_end, "compile-error": self.on_compile_error, "compile-message": self.on_compile_message, "batch-begin": self.on_batch_begin, "batch-end": self.on_batch_end, "test-case-status": self.on_test_case, "internal-error": self.on_internal_error, "submission-terminated": self.on_submission_terminated, "submission-acknowledged": self.on_submission_acknowledged, "ping-response": self.on_ping_response, "supported-problems": self.on_supported_problems, "handshake": self.on_handshake, } self._working = False self._no_response_job = None self._problems = [] self.executors = {} self.problems = {} self.latency = None self.time_delta = None self.load = 1e100 self.name = None self.batch_id = None self.in_batch = False self._stop_ping = threading.Event() self._ping_average = deque(maxlen=6) # 1 minute average, just like load self._time_delta = deque(maxlen=6) # each value is (updates, last reset) self.update_counter = {} self.judge = None self.judge_address = None self._submission_cache_id = None self._submission_cache = {} def on_connect(self): self.timeout = 15 logger.info("Judge connected from: %s", self.client_address) json_log.info(self._make_json_log(action="connect")) def on_disconnect(self): self._stop_ping.set() if self._working: logger.error( "Judge %s disconnected while handling submission %s", self.name, self._working, ) self.judges.remove(self) if self.name is not None: self._disconnected() logger.info( "Judge disconnected from: %s with name %s", self.client_address, self.name ) json_log.info( self._make_json_log(action="disconnect", info="judge disconnected") ) if self._working: Submission.objects.filter(id=self._working).update( status="IE", result="IE", error="" ) json_log.error( self._make_json_log( sub=self._working, action="close", info="IE due to shutdown on grading", ) ) def _authenticate(self, id, key): try: judge = Judge.objects.get(name=id, is_blocked=False) except Judge.DoesNotExist: result = False else: result = hmac.compare_digest(judge.auth_key, key) if not result: json_log.warning( self._make_json_log( action="auth", judge=id, info="judge failed authentication" ) ) return result def _connected(self): judge = self.judge = Judge.objects.get(name=self.name) judge.start_time = timezone.now() judge.online = True judge.problems.set(Problem.objects.filter(code__in=list(self.problems.keys()))) judge.runtimes.set(Language.objects.filter(key__in=list(self.executors.keys()))) # Delete now in case we somehow crashed and left some over from the last connection RuntimeVersion.objects.filter(judge=judge).delete() versions = [] for lang in judge.runtimes.all(): versions += [ RuntimeVersion( language=lang, name=name, version=".".join(map(str, version)), priority=idx, judge=judge, ) for idx, (name, version) in enumerate(self.executors[lang.key]) ] RuntimeVersion.objects.bulk_create(versions) judge.last_ip = self.client_address[0] judge.save() self.judge_address = "[%s]:%s" % ( self.client_address[0], self.client_address[1], ) json_log.info( self._make_json_log( action="auth", info="judge successfully authenticated", executors=list(self.executors.keys()), ) ) def _disconnected(self): Judge.objects.filter(id=self.judge.id).update(online=False) RuntimeVersion.objects.filter(judge=self.judge).delete() def _update_ping(self): try: Judge.objects.filter(name=self.name).update( ping=self.latency, load=self.load ) except Exception as e: # What can I do? I don't want to tie this to MySQL. if ( e.__class__.__name__ == "OperationalError" and e.__module__ == "_mysql_exceptions" and e.args[0] == 2006 ): db.connection.close() def send(self, data): super().send(json.dumps(data, separators=(",", ":"))) def on_handshake(self, packet): if "id" not in packet or "key" not in packet: logger.warning("Malformed handshake: %s", self.client_address) self.close() return if not self._authenticate(packet["id"], packet["key"]): logger.warning("Authentication failure: %s", self.client_address) self.close() return self.timeout = 60 self._problems = packet["problems"] self.problems = dict(self._problems) self.executors = packet["executors"] self.name = packet["id"] self.send({"name": "handshake-success"}) logger.info("Judge authenticated: %s (%s)", self.client_address, packet["id"]) self.judges.register(self) threading.Thread(target=self._ping_thread).start() self._connected() def can_judge(self, problem, executor, judge_id=None): return ( problem in self.problems and executor in self.executors and (not judge_id or self.name == judge_id) ) @property def working(self): return bool(self._working) def get_related_submission_data(self, submission): _ensure_connection() try: ( pid, time, memory, short_circuit, lid, is_pretested, sub_date, uid, part_virtual, part_id, ) = ( Submission.objects.filter(id=submission).values_list( "problem__id", "problem__time_limit", "problem__memory_limit", "problem__short_circuit", "language__id", "is_pretested", "date", "user__id", "contest__participation__virtual", "contest__participation__id", ) ).get() except Submission.DoesNotExist: logger.error("Submission vanished: %s", submission) json_log.error( self._make_json_log( sub=self._working, action="request", info="submission vanished when fetching info", ) ) return attempt_no = ( Submission.objects.filter( problem__id=pid, contest__participation__id=part_id, user__id=uid, date__lt=sub_date, ) .exclude(status__in=("CE", "IE")) .count() + 1 ) try: time, memory = ( LanguageLimit.objects.filter(problem__id=pid, language__id=lid) .values_list("time_limit", "memory_limit") .get() ) except LanguageLimit.DoesNotExist: pass return SubmissionData( time=time, memory=memory, short_circuit=short_circuit, pretests_only=is_pretested, contest_no=part_virtual, attempt_no=attempt_no, user_id=uid, ) def disconnect(self, force=False): if force: # Yank the power out. self.close() else: self.send({"name": "disconnect"}) def submit(self, id, problem, language, source): data = self.get_related_submission_data(id) self._working = id self._no_response_job = threading.Timer(20, self._kill_if_no_response) self.send( { "name": "submission-request", "submission-id": id, "problem-id": problem, "language": language, "source": source, "time-limit": data.time, "memory-limit": data.memory, "short-circuit": data.short_circuit, "meta": { "pretests-only": data.pretests_only, "in-contest": data.contest_no, "attempt-no": data.attempt_no, "user": data.user_id, }, } ) def _kill_if_no_response(self): logger.error( "Judge failed to acknowledge submission: %s: %s", self.name, self._working ) self.close() def on_timeout(self): if self.name: logger.warning("Judge seems dead: %s: %s", self.name, self._working) def malformed_packet(self, exception): logger.exception("Judge sent malformed packet: %s", self.name) super(JudgeHandler, self).malformed_packet(exception) def on_submission_processing(self, packet): _ensure_connection() id = packet["submission-id"] if Submission.objects.filter(id=id).update(status="P", judged_on=self.judge): event.post("sub_%s" % Submission.get_id_secret(id), {"type": "processing"}) self._post_update_submission(id, "processing") json_log.info(self._make_json_log(packet, action="processing")) else: logger.warning("Unknown submission: %s", id) json_log.error( self._make_json_log( packet, action="processing", info="unknown submission" ) ) def on_submission_wrong_acknowledge(self, packet, expected, got): json_log.error( self._make_json_log( packet, action="processing", info="wrong-acknowledge", expected=expected ) ) Submission.objects.filter(id=expected).update( status="IE", result="IE", error=None ) Submission.objects.filter(id=got, status="QU").update( status="IE", result="IE", error=None ) def on_submission_acknowledged(self, packet): if not packet.get("submission-id", None) == self._working: logger.error( "Wrong acknowledgement: %s: %s, expected: %s", self.name, packet.get("submission-id", None), self._working, ) self.on_submission_wrong_acknowledge( packet, self._working, packet.get("submission-id", None) ) self.close() logger.info("Submission acknowledged: %d", self._working) if self._no_response_job: self._no_response_job.cancel() self._no_response_job = None self.on_submission_processing(packet) def abort(self): self.send({"name": "terminate-submission"}) def get_current_submission(self): return self._working or None def ping(self): self.send({"name": "ping", "when": time.time()}) def on_packet(self, data): try: try: data = json.loads(data) if "name" not in data: raise ValueError except ValueError: self.on_malformed(data) else: handler = self.handlers.get(data["name"], self.on_malformed) handler(data) except Exception: logger.exception("Error in packet handling (Judge-side): %s", self.name) self._packet_exception() # You can't crash here because you aren't so sure about the judges # not being malicious or simply malforms. THIS IS A SERVER! def _packet_exception(self): json_log.exception( self._make_json_log(sub=self._working, info="packet processing exception") ) def _submission_is_batch(self, id): if not Submission.objects.filter(id=id).update(batch=True): logger.warning("Unknown submission: %s", id) def on_supported_problems(self, packet): logger.info("%s: Updated problem list", self.name) self._problems = packet["problems"] self.problems = dict(self._problems) if not self.working: self.judges.update_problems(self) self.judge.problems.set( Problem.objects.filter(code__in=list(self.problems.keys())) ) json_log.info( self._make_json_log(action="update-problems", count=len(self.problems)) ) def on_grading_begin(self, packet): logger.info("%s: Grading has begun on: %s", self.name, packet["submission-id"]) self.batch_id = None if Submission.objects.filter(id=packet["submission-id"]).update( status="G", is_pretested=packet["pretested"], current_testcase=1, points=0, batch=False, judged_date=timezone.now(), ): SubmissionTestCase.objects.filter( submission_id=packet["submission-id"] ).delete() event.post( "sub_%s" % Submission.get_id_secret(packet["submission-id"]), {"type": "grading-begin"}, ) self._post_update_submission(packet["submission-id"], "grading-begin") json_log.info(self._make_json_log(packet, action="grading-begin")) else: logger.warning("Unknown submission: %s", packet["submission-id"]) json_log.error( self._make_json_log( packet, action="grading-begin", info="unknown submission" ) ) def on_grading_end(self, packet): logger.info("%s: Grading has ended on: %s", self.name, packet["submission-id"]) self._free_self(packet) self.batch_id = None try: submission = Submission.objects.get(id=packet["submission-id"]) except Submission.DoesNotExist: logger.warning("Unknown submission: %s", packet["submission-id"]) json_log.error( self._make_json_log( packet, action="grading-end", info="unknown submission" ) ) return time = 0 memory = 0 points = 0.0 total = 0 status = 0 status_codes = ["SC", "AC", "WA", "MLE", "TLE", "IR", "RTE", "OLE"] batches = {} # batch number: (points, total) for case in SubmissionTestCase.objects.filter(submission=submission): time += case.time if not case.batch: points += case.points total += case.total else: if case.batch in batches: batches[case.batch][0] += case.points batches[case.batch][1] += case.total else: batches[case.batch] = [case.points, case.total] memory = max(memory, case.memory) i = status_codes.index(case.status) if i > status: status = i for i in batches: points += batches[i][0] total += batches[i][1] points = points total = total submission.case_points = points submission.case_total = total problem = submission.problem sub_points = round(points / total * problem.points if total > 0 else 0, 3) if not problem.partial and sub_points != problem.points: sub_points = 0 submission.status = "D" submission.time = time submission.memory = memory submission.points = sub_points submission.result = status_codes[status] submission.save() json_log.info( self._make_json_log( packet, action="grading-end", time=time, memory=memory, points=sub_points, total=problem.points, result=submission.result, case_points=points, case_total=total, user=submission.user_id, problem=problem.code, finish=True, ) ) submission.user._updating_stats_only = True submission.user.calculate_points() problem._updating_stats_only = True problem.update_stats() submission.update_contest() finished_submission(submission) event.post( "sub_%s" % submission.id_secret, { "type": "grading-end", "time": time, "memory": memory, "points": float(points), "total": float(problem.points), "result": submission.result, }, ) if hasattr(submission, "contest"): participation = submission.contest.participation event.post("contest_%d" % participation.contest_id, {"type": "update"}) self._post_update_submission(submission.id, "grading-end", done=True) def on_compile_error(self, packet): logger.info( "%s: Submission failed to compile: %s", self.name, packet["submission-id"] ) self._free_self(packet) if Submission.objects.filter(id=packet["submission-id"]).update( status="CE", result="CE", error=packet["log"] ): event.post( "sub_%s" % Submission.get_id_secret(packet["submission-id"]), { "type": "compile-error", "log": packet["log"], }, ) self._post_update_submission( packet["submission-id"], "compile-error", done=True ) json_log.info( self._make_json_log( packet, action="compile-error", log=packet["log"], finish=True, result="CE", ) ) else: logger.warning("Unknown submission: %s", packet["submission-id"]) json_log.error( self._make_json_log( packet, action="compile-error", info="unknown submission", log=packet["log"], finish=True, result="CE", ) ) def on_compile_message(self, packet): logger.info( "%s: Submission generated compiler messages: %s", self.name, packet["submission-id"], ) if Submission.objects.filter(id=packet["submission-id"]).update( error=packet["log"] ): event.post( "sub_%s" % Submission.get_id_secret(packet["submission-id"]), {"type": "compile-message"}, ) json_log.info( self._make_json_log(packet, action="compile-message", log=packet["log"]) ) else: logger.warning("Unknown submission: %s", packet["submission-id"]) json_log.error( self._make_json_log( packet, action="compile-message", info="unknown submission", log=packet["log"], ) ) def on_internal_error(self, packet): try: raise ValueError("\n\n" + packet["message"]) except ValueError: logger.exception( "Judge %s failed while handling submission %s", self.name, packet["submission-id"], ) self._free_self(packet) id = packet["submission-id"] if Submission.objects.filter(id=id).update( status="IE", result="IE", error=packet["message"] ): event.post( "sub_%s" % Submission.get_id_secret(id), {"type": "internal-error"} ) self._post_update_submission(id, "internal-error", done=True) json_log.info( self._make_json_log( packet, action="internal-error", message=packet["message"], finish=True, result="IE", ) ) else: logger.warning("Unknown submission: %s", id) json_log.error( self._make_json_log( packet, action="internal-error", info="unknown submission", message=packet["message"], finish=True, result="IE", ) ) def on_submission_terminated(self, packet): logger.info("%s: Submission aborted: %s", self.name, packet["submission-id"]) self._free_self(packet) if Submission.objects.filter(id=packet["submission-id"]).update( status="AB", result="AB" ): event.post( "sub_%s" % Submission.get_id_secret(packet["submission-id"]), {"type": "aborted-submission"}, ) self._post_update_submission( packet["submission-id"], "terminated", done=True ) json_log.info( self._make_json_log(packet, action="aborted", finish=True, result="AB") ) else: logger.warning("Unknown submission: %s", packet["submission-id"]) json_log.error( self._make_json_log( packet, action="aborted", info="unknown submission", finish=True, result="AB", ) ) def on_batch_begin(self, packet): logger.info("%s: Batch began on: %s", self.name, packet["submission-id"]) self.in_batch = True if self.batch_id is None: self.batch_id = 0 self._submission_is_batch(packet["submission-id"]) self.batch_id += 1 json_log.info( self._make_json_log(packet, action="batch-begin", batch=self.batch_id) ) def on_batch_end(self, packet): self.in_batch = False logger.info("%s: Batch ended on: %s", self.name, packet["submission-id"]) json_log.info( self._make_json_log(packet, action="batch-end", batch=self.batch_id) ) def on_test_case( self, packet, max_feedback=SubmissionTestCase._meta.get_field("feedback").max_length, ): logger.info( "%s: %d test case(s) completed on: %s", self.name, len(packet["cases"]), packet["submission-id"], ) id = packet["submission-id"] updates = packet["cases"] max_position = max(map(itemgetter("position"), updates)) sum_points = sum(map(itemgetter("points"), updates)) if not Submission.objects.filter(id=id).update( current_testcase=max_position + 1, points=F("points") + sum_points ): logger.warning("Unknown submission: %s", id) json_log.error( self._make_json_log( packet, action="test-case", info="unknown submission" ) ) return bulk_test_case_updates = [] for result in updates: test_case = SubmissionTestCase(submission_id=id, case=result["position"]) status = result["status"] if status & 4: test_case.status = "TLE" elif status & 8: test_case.status = "MLE" elif status & 64: test_case.status = "OLE" elif status & 2: test_case.status = "RTE" elif status & 16: test_case.status = "IR" elif status & 1: test_case.status = "WA" elif status & 32: test_case.status = "SC" else: test_case.status = "AC" test_case.time = result["time"] test_case.memory = result["memory"] test_case.points = result["points"] test_case.total = result["total-points"] test_case.batch = self.batch_id if self.in_batch else None test_case.feedback = (result.get("feedback") or "")[:max_feedback] test_case.extended_feedback = result.get("extended-feedback") or "" test_case.output = result["output"] bulk_test_case_updates.append(test_case) json_log.info( self._make_json_log( packet, action="test-case", case=test_case.case, batch=test_case.batch, time=test_case.time, memory=test_case.memory, feedback=test_case.feedback, extended_feedback=test_case.extended_feedback, output=test_case.output, points=test_case.points, total=test_case.total, status=test_case.status, ) ) do_post = True if id in self.update_counter: cnt, reset = self.update_counter[id] cnt += 1 if time.monotonic() - reset > UPDATE_RATE_TIME: del self.update_counter[id] else: self.update_counter[id] = (cnt, reset) if cnt > UPDATE_RATE_LIMIT: do_post = False if id not in self.update_counter: self.update_counter[id] = (1, time.monotonic()) if do_post: event.post( "sub_%s" % Submission.get_id_secret(id), { "type": "test-case", "id": max_position, }, ) self._post_update_submission(id, state="test-case") SubmissionTestCase.objects.bulk_create(bulk_test_case_updates) def on_malformed(self, packet): logger.error("%s: Malformed packet: %s", self.name, packet) json_log.exception( self._make_json_log(sub=self._working, info="malformed json packet") ) def on_ping_response(self, packet): end = time.time() self._ping_average.append(end - packet["when"]) self._time_delta.append((end + packet["when"]) / 2 - packet["time"]) self.latency = sum(self._ping_average) / len(self._ping_average) self.time_delta = sum(self._time_delta) / len(self._time_delta) self.load = packet["load"] self._update_ping() def _free_self(self, packet): self.judges.on_judge_free(self, packet["submission-id"]) def _ping_thread(self): try: while True: self.ping() if self._stop_ping.wait(10): break except Exception: logger.exception("Ping error in %s", self.name) self.close() raise def _make_json_log(self, packet=None, sub=None, **kwargs): data = { "judge": self.name, "address": self.judge_address, } if sub is None and packet is not None: sub = packet.get("submission-id") if sub is not None: data["submission"] = sub data.update(kwargs) return json.dumps(data) def _post_update_submission(self, id, state, done=False): if self._submission_cache_id == id: data = self._submission_cache else: self._submission_cache = data = ( Submission.objects.filter(id=id) .values( "problem__is_public", "contest_object__key", "user_id", "problem_id", "status", "language__key", ) .get() ) self._submission_cache_id = id if data["problem__is_public"]: event.post( "submissions", { "type": "done-submission" if done else "update-submission", "state": state, "id": id, "contest": data["contest_object__key"], "user": data["user_id"], "problem": data["problem_id"], "status": data["status"], "language": data["language__key"], }, )