diff options
Diffstat (limited to 'cloudinit/reporting/handlers.py')
| -rwxr-xr-x[-rw-r--r--] | cloudinit/reporting/handlers.py | 117 |
1 files changed, 57 insertions, 60 deletions
diff --git a/cloudinit/reporting/handlers.py b/cloudinit/reporting/handlers.py index 6d23558e..10165aec 100644..100755 --- a/cloudinit/reporting/handlers.py +++ b/cloudinit/reporting/handlers.py @@ -5,7 +5,6 @@ import fcntl import json import six import os -import re import struct import threading import time @@ -14,6 +13,7 @@ from cloudinit import log as logging from cloudinit.registry import DictRegistry from cloudinit import (url_helper, util) from datetime import datetime +from six.moves.queue import Empty as QueueEmptyError if six.PY2: from multiprocessing.queues import JoinableQueue as JQueue @@ -129,24 +129,50 @@ class HyperVKvpReportingHandler(ReportingHandler): DESC_IDX_KEY = 'msg_i' JSON_SEPARATORS = (',', ':') KVP_POOL_FILE_GUEST = '/var/lib/hyperv/.kvp_pool_1' + _already_truncated_pool_file = False def __init__(self, kvp_file_path=KVP_POOL_FILE_GUEST, event_types=None): super(HyperVKvpReportingHandler, self).__init__() self._kvp_file_path = kvp_file_path + HyperVKvpReportingHandler._truncate_guest_pool_file( + self._kvp_file_path) + self._event_types = event_types self.q = JQueue() - self.kvp_file = None self.incarnation_no = self._get_incarnation_no() self.event_key_prefix = u"{0}|{1}".format(self.EVENT_PREFIX, self.incarnation_no) - self._current_offset = 0 self.publish_thread = threading.Thread( target=self._publish_event_routine) self.publish_thread.daemon = True self.publish_thread.start() + @classmethod + def _truncate_guest_pool_file(cls, kvp_file): + """ + Truncate the pool file if it has not been truncated since boot. + This should be done exactly once for the file indicated by + KVP_POOL_FILE_GUEST constant above. This method takes a filename + so that we can use an arbitrary file during unit testing. + Since KVP is a best-effort telemetry channel we only attempt to + truncate the file once and only if the file has not been modified + since boot. Additional truncation can lead to loss of existing + KVPs. + """ + if cls._already_truncated_pool_file: + return + boot_time = time.time() - float(util.uptime()) + try: + if os.path.getmtime(kvp_file) < boot_time: + with open(kvp_file, "w"): + pass + except (OSError, IOError) as e: + LOG.warning("failed to truncate kvp pool file, %s", e) + finally: + cls._already_truncated_pool_file = True + def _get_incarnation_no(self): """ use the time passed as the incarnation number. @@ -162,20 +188,15 @@ class HyperVKvpReportingHandler(ReportingHandler): def _iterate_kvps(self, offset): """iterate the kvp file from the current offset.""" - try: - with open(self._kvp_file_path, 'rb+') as f: - self.kvp_file = f - fcntl.flock(f, fcntl.LOCK_EX) - f.seek(offset) + with open(self._kvp_file_path, 'rb') as f: + fcntl.flock(f, fcntl.LOCK_EX) + f.seek(offset) + record_data = f.read(self.HV_KVP_RECORD_SIZE) + while len(record_data) == self.HV_KVP_RECORD_SIZE: + kvp_item = self._decode_kvp_item(record_data) + yield kvp_item record_data = f.read(self.HV_KVP_RECORD_SIZE) - while len(record_data) == self.HV_KVP_RECORD_SIZE: - self._current_offset += self.HV_KVP_RECORD_SIZE - kvp_item = self._decode_kvp_item(record_data) - yield kvp_item - record_data = f.read(self.HV_KVP_RECORD_SIZE) - fcntl.flock(f, fcntl.LOCK_UN) - finally: - self.kvp_file = None + fcntl.flock(f, fcntl.LOCK_UN) def _event_key(self, event): """ @@ -207,23 +228,13 @@ class HyperVKvpReportingHandler(ReportingHandler): return {'key': k, 'value': v} - def _update_kvp_item(self, record_data): - if self.kvp_file is None: - raise ReportException( - "kvp file '{0}' not opened." - .format(self._kvp_file_path)) - self.kvp_file.seek(-self.HV_KVP_RECORD_SIZE, 1) - self.kvp_file.write(record_data) - def _append_kvp_item(self, record_data): - with open(self._kvp_file_path, 'rb+') as f: + with open(self._kvp_file_path, 'ab') as f: fcntl.flock(f, fcntl.LOCK_EX) - # seek to end of the file - f.seek(0, 2) - f.write(record_data) + for data in record_data: + f.write(data) f.flush() fcntl.flock(f, fcntl.LOCK_UN) - self._current_offset = f.tell() def _break_down(self, key, meta_data, description): del meta_data[self.MSG_KEY] @@ -279,40 +290,26 @@ class HyperVKvpReportingHandler(ReportingHandler): def _publish_event_routine(self): while True: + items_from_queue = 0 try: event = self.q.get(block=True) - need_append = True + items_from_queue += 1 + encoded_data = [] + while event is not None: + encoded_data += self._encode_event(event) + try: + # get all the rest of the events in the queue + event = self.q.get(block=False) + items_from_queue += 1 + except QueueEmptyError: + event = None try: - if not os.path.exists(self._kvp_file_path): - LOG.warning( - "skip writing events %s to %s. file not present.", - event.as_string(), - self._kvp_file_path) - encoded_event = self._encode_event(event) - # for each encoded_event - for encoded_data in (encoded_event): - for kvp in self._iterate_kvps(self._current_offset): - match = ( - re.match( - r"^{0}\|(\d+)\|.+" - .format(self.EVENT_PREFIX), - kvp['key'] - )) - if match: - match_groups = match.groups(0) - if int(match_groups[0]) < self.incarnation_no: - need_append = False - self._update_kvp_item(encoded_data) - continue - if need_append: - self._append_kvp_item(encoded_data) - except IOError as e: - LOG.warning( - "failed posting event to kvp: %s e:%s", - event.as_string(), e) + self._append_kvp_item(encoded_data) + except (OSError, IOError) as e: + LOG.warning("failed posting events to kvp, %s", e) finally: - self.q.task_done() - + for _ in range(items_from_queue): + self.q.task_done() # when main process exits, q.get() will through EOFError # indicating we should exit this thread. except EOFError: @@ -322,7 +319,7 @@ class HyperVKvpReportingHandler(ReportingHandler): # if the kvp pool already contains a chunk of data, # so defer it to another thread. def publish_event(self, event): - if (not self._event_types or event.event_type in self._event_types): + if not self._event_types or event.event_type in self._event_types: self.q.put(event) def flush(self): |