quay/workers/exportactionlogsworker.py

import logging
import os.path
import json
import time
import uuid

from datetime import datetime, timedelta
from io import BytesIO

from enum import Enum, unique

import features

from app import app, export_action_logs_queue, storage, get_app_url, avatar
from endpoints.api import format_date
from data.logs_model import logs_model
from data.logs_model.interface import LogsIterationTimeout
from workers.queueworker import QueueWorker, JobException
from util.log import logfile_path
from util.useremails import send_logs_exported_email

logger = logging.getLogger(__name__)


POLL_PERIOD_SECONDS = 1

EXPORT_LOGS_STORAGE_PATH = app.config.get('EXPORT_ACTION_LOGS_STORAGE_PATH', 'exportedactionlogs')
MAXIMUM_WORK_PERIOD_SECONDS = app.config.get('EXPORT_ACTION_LOGS_MAXIMUM_SECONDS', 60 * 60) # 1 hour
MAXIMUM_QUERY_TIME_SECONDS = app.config.get('EXPORT_ACTION_LOGS_MAXIMUM_QUERY_TIME_SECONDS', 30)
EXPORTED_LOGS_EXPIRATION_SECONDS = app.config.get('EXPORT_ACTION_LOGS_SECONDS', 60 * 60) # 1 hour


@unique
class ExportResult(Enum):
  # NOTE: Make sure to handle these in `logsexported.html` in `emails`
  INVALID_REQUEST = 'invalidrequest'
  OPERATION_TIMEDOUT = 'timedout'
  SUCCESSFUL_EXPORT = 'success'


class ExportActionLogsWorker(QueueWorker):
  """ Worker which exports action logs for a namespace or a repository based on
      a queued request from the API.
  """
  def process_queue_item(self, job_details):
    logger.info('Got export actions logs queue item: %s', job_details)

    # job_details block (as defined in the logs.py API endpoint):
    # {
    #  'export_id': export_id,
    #  'repository_id': repository.id or None,
    #  'namespace_id': namespace.id,
    #  'namespace_name': namespace.username,
    #  'repository_name': repository.name or None,
    #  'start_time': start_time,
    #  'end_time': end_time,
    #  'callback_url': callback_url or None,
    #  'callback_email': callback_email or None,
    # }
    export_id = job_details['export_id']

    start_time = _parse_time(job_details['start_time'])
    end_time = _parse_time(job_details['end_time'])

    # Make sure the end time has the whole day.
    if start_time is None or end_time is None:
      self._report_results(job_details, ExportResult.INVALID_REQUEST)
      return

    end_time = end_time + timedelta(days=1) - timedelta(milliseconds=1)

    # Select the minimum and maximum IDs for the logs for the repository/namespace
    # over the time range.
    namespace_id = job_details['namespace_id']
    repository_id = job_details['repository_id']
    max_query_time = timedelta(seconds=MAXIMUM_QUERY_TIME_SECONDS)

    # Generate a file key so that if we return an API URL, it cannot simply be constructed from
    # just the export ID.
    file_key = str(uuid.uuid4())
    exported_filename = '%s-%s' % (export_id, file_key)

    # Start a chunked upload for the logs and stream them.
    upload_id, upload_metadata = storage.initiate_chunked_upload(storage.preferred_locations)
    export_storage_path = os.path.join(EXPORT_LOGS_STORAGE_PATH, exported_filename)
    logger.debug('Starting chunked upload to path `%s`', export_storage_path)

    # Start with a 'json' header that contains the opening bracket, as well as basic
    # information and the start of the `logs` array.
    details = {
      'start_time': format_date(start_time),
      'end_time': format_date(end_time),
      'namespace': job_details['namespace_name'],
      'repository': job_details['repository_name'],
    }

    prefix_data = """{
      "export_id": "%s",
      "details": %s,
      "logs": [
    """ % (export_id, json.dumps(details))

    upload_metadata = storage.stream_upload_chunk(storage.preferred_locations, upload_id, 0, -1,
                                                  BytesIO(str(prefix_data)), upload_metadata)
    uploaded_byte_count = len(prefix_data)

    logs_iterator = logs_model.yield_logs_for_export(start_time, end_time, repository_id,
                                                     namespace_id, max_query_time)

    try:
      # Stream the logs to storage as chunks.
      updated_metadata, uploaded_byte_count = self._stream_logs(upload_id, upload_metadata,
                                                                uploaded_byte_count, logs_iterator,
                                                                job_details)
      if updated_metadata is None:
        storage.cancel_chunked_upload(upload_id, upload_metadata)
        return

      # Close the JSON block.
      suffix_data = """
        {"terminator": true}]
      }"""

      upload_metadata = storage.stream_upload_chunk(storage.preferred_locations, upload_id,
                                                    uploaded_byte_count, -1,
                                                    BytesIO(str(suffix_data)),
                                                    upload_metadata)
      if updated_metadata is None:
        storage.cancel_chunked_upload(upload_id, upload_metadata)
        return

      # Complete the upload.
      storage.complete_chunked_upload(storage.preferred_locations, upload_id, export_storage_path,
                                      updated_metadata)
    except:
      logger.exception('Exception when exporting logs for `%s`', export_id)
      storage.cancel_chunked_upload(storage.preferred_locations, upload_id, upload_metadata)
      raise JobException

    # Invoke the callbacks.
    export_url = storage.get_direct_download_url(storage.preferred_locations, export_storage_path,
                                                 expires_in=EXPORTED_LOGS_EXPIRATION_SECONDS)
    if export_url is None:
      export_url = '%s/exportedlogs/%s' % (get_app_url(), exported_filename)

    self._report_results(job_details, ExportResult.SUCCESSFUL_EXPORT, export_url)

  def _stream_logs(self, upload_id, upload_metadata, uploaded_byte_count, logs_iterator,
                   job_details):
    export_id = job_details['export_id']
    max_work_period = timedelta(seconds=MAXIMUM_WORK_PERIOD_SECONDS)
    batch_start_time = datetime.utcnow()

    try:
      for logs in logs_iterator:
        work_elapsed = datetime.utcnow() - batch_start_time
        if work_elapsed > max_work_period:
          logger.error('Retrieval of logs `%s` timed out with time of `%s`',
                       export_id, work_elapsed)
          self._report_results(job_details, ExportResult.OPERATION_TIMEDOUT)
          return None, None

        logs_data = ''
        if logs:
          logs_data = ','.join([json.dumps(log.to_dict(avatar, False)) for log in logs]) + ','

        logs_data = logs_data.encode('utf-8')
        upload_metadata = storage.stream_upload_chunk(storage.preferred_locations, upload_id,
                                                      uploaded_byte_count, -1,
                                                      BytesIO(logs_data),
                                                      upload_metadata)
        uploaded_byte_count += len(logs_data)
    except LogsIterationTimeout:
      logger.error('Retrieval of logs for export logs timed out at `%s`', work_elapsed)
      self._report_results(job_details, ExportResult.OPERATION_TIMEDOUT)
      return None, None

    return upload_metadata, uploaded_byte_count

  def _report_results(self, job_details, result_status, exported_data_url=None):
    logger.info('Reporting result of `%s` for %s; %s', result_status, job_details,
                exported_data_url)

    if job_details.get('callback_url'):
      # Post the results to the callback URL.
      client = app.config['HTTPCLIENT']
      result = client.post(job_details['callback_url'], json={
        'export_id': job_details['export_id'],
        'start_time': job_details['start_time'],
        'end_time': job_details['end_time'],
        'namespace': job_details['namespace_name'],
        'repository': job_details['repository_name'],
        'exported_data_url': exported_data_url,
        'status': result_status.value,
      })

      if result.status_code != 200:
        logger.error('Got `%s` status code for callback URL `%s` for export `%s`',
                     result.status_code, job_details['callback_url'],
                     job_details['export_id'])
        raise Exception('Got non-200 for batch logs reporting; retrying later')

    if job_details.get('callback_email'):
      with app.app_context():
        send_logs_exported_email(job_details['callback_email'], job_details['export_id'],
                                 result_status, exported_data_url,
                                 EXPORTED_LOGS_EXPIRATION_SECONDS)


def _parse_time(specified_time):
  try:
    return datetime.strptime(specified_time + ' UTC', '%m/%d/%Y %Z')
  except ValueError:
    return None


if __name__ == "__main__":
  logging.config.fileConfig(logfile_path(debug=False), disable_existing_loggers=False)

  if not features.LOG_EXPORT:
    logger.debug('Log export not enabled; skipping')
    while True:
      time.sleep(100000)

  logger.debug('Starting export action logs worker')
  worker = ExportActionLogsWorker(export_action_logs_queue,
                                  poll_period_seconds=POLL_PERIOD_SECONDS)
  worker.start()