diff options
| -rw-r--r-- | python/sandcrawler/workers.py | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/python/sandcrawler/workers.py b/python/sandcrawler/workers.py index d5db7a5..9f1b55c 100644 --- a/python/sandcrawler/workers.py +++ b/python/sandcrawler/workers.py @@ -2,6 +2,7 @@ import sys import json import time +import signal import zipfile import multiprocessing.pool from collections import Counter @@ -40,6 +41,43 @@ class SandcrawlerWorker(object): print(json.dumps(result)) return result + def timeout_response(self, task): + """ + This should be overridden by workers that want to return something + meaningful when there is a processing timeout. Eg, JSON vs some other + error message. + """ + return None + + def push_record_timeout(self, task, timeout=300): + """ + A wrapper around self.push_record which sets a timeout. + + Note that this uses signals and *will behave wrong/weirdly* with + multithreading or if signal-based timeouts are used elsewhere in the + same process. + """ + + def timeout_handler(signum, frame): + raise TimeoutError("timeout processing record") + signal.signal(signal.SIGALRM, timeout_handler) + resp = None + signal.alarm(int(timeout)) + try: + resp = self.push_record(task) + except TimeoutError: + self.counts['timeout'] += 1 + resp = self.timeout_response(task) # pylint: disable=assignment-from-none + # TODO: what if it is this push_record() itself that is timing out? + if self.sink: + self.sink.push_record(resp) + self.counts['pushed'] += 1 + else: + print(json.dumps(resp)) + finally: + signal.alarm(0) + return resp + def push_batch(self, tasks): results = [] for task in tasks: @@ -338,7 +376,6 @@ class ZipfilePusher(RecordPusher): print("ZIP PDFs pushed: {}".format(self.counts), file=sys.stderr) return self.counts - class KafkaJsonPusher(RecordPusher): def __init__(self, worker, kafka_hosts, consume_topic, group, **kwargs): @@ -398,7 +435,8 @@ class KafkaJsonPusher(RecordPusher): done = False while not done: try: - self.worker.push_record(record) + # use timeouts; don't want kafka itself to timeout + self.worker.push_record_timeout(record, timeout=300) break except SandcrawlerBackoffError as be: print("Backing off for 200 seconds: {}".format(be)) |