import logging

from apscheduler.schedulers.blocking import BlockingScheduler
from peewee import fn
from tempfile import SpooledTemporaryFile

from data import model
from data.database import configure, RepositoryBuild
from app import app, build_logs, log_archive
from util.streamingjsonencoder import StreamingJSONEncoder

POLL_PERIOD_SECONDS = 30

logger = logging.getLogger(__name__)
sched = BlockingScheduler()

@sched.scheduled_job(trigger='interval', seconds=5)
def archive_redis_buildlogs():
  """ Archive a single build, choosing a candidate at random. This process must be idempotent to
      avoid needing two-phase commit. """
  try:
    # Get a random build to archive
    to_archive = model.archivable_buildlogs_query().order_by(fn.Random()).get()
    logger.debug('Archiving: %s', to_archive.uuid)

    length, entries = build_logs.get_log_entries(to_archive.uuid, 0)
    to_encode = {
      'start': 0,
      'total': length,
      'logs': entries,
    }

    for chunk in StreamingJSONEncoder().iterencode(to_encode):
      print chunk

  except RepositoryBuild.DoesNotExist:
    logger.debug('No more builds to archive')


if __name__ == "__main__":
  logging.basicConfig(level=logging.DEBUG)
  sched.start()