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import sqlite3
import datetime
import threading
import logging
import concurrent.futures
import asyncio
from hatter import util
from hatter import executor
util.monkeypatch_sqlite3()
LogEntry = util.namedtuple('LogEntry',
['timestamp', 'datetime.datetime: timestamp'],
['repository', 'str: repository'],
['commit', 'str: commit'],
['msg', 'str: message'])
Job = util.namedtuple('Job',
['id', 'int: id'],
['timestamp', 'datetime.datetime: timestamp'],
['repository', 'str: repository'],
['commit', 'str: commit'])
class Backend:
def __init__(self, db_path, repositories):
self._repositories = repositories
self._next_job_id = 0
self._active = None
self._queue = []
self._active_change_cbs = util.CallbackRegistry()
self._queue_change_cbs = util.CallbackRegistry()
self._log_change_cbs = util.CallbackRegistry()
self._cv = asyncio.Condition()
self._db = _DB(db_path)
self._executor = concurrent.futures.ThreadPoolExecutor()
self._run_loop_future = asyncio.ensure_future(self._run_loop())
@property
def repositories(self):
return self._repositories
@property
def active(self):
return self._active
@property
def queue(self):
return self._queue
def register_active_change_cb(self, cb):
return self._active_change_cbs.register(cb)
def register_queue_change_cb(self, cb):
return self._queue_change_cbs.register(cb)
def register_log_change_cb(self, cb):
return self._log_change_cbs.register(cb)
async def async_close(self):
self._run_loop_future.cancel()
await self._run_loop_future
async def query_log(self, offset, limit):
return await asyncio.get_event_loop().run_in_executor(
self._executor, self._db.query, offset, limit)
async def add_job(self, repository, commit):
job = Job(id=self._next_job_id,
timestamp=datetime.datetime.now(datetime.timezone.utc),
repository=repository,
commit=commit)
self._next_job_id += 1
with await self._cv:
self._queue.append(job)
self._cv.notify_all()
self._queue_change_cbs.notify()
async def _run_loop(self):
log = logging.getLogger('hatter.project')
while True:
with await self._cv:
while not self._queue:
await self._cv.wait()
self._active = self._queue_change_cbs.pop(0)
self._queue_change_cbs.notify()
self._active_change_cbs.notify()
handler = _LogHandler(
self._db, self._active.repository, self._active.commit)
log.addHandler(handler)
try:
await asyncio.get_event_loop().run_in_executor(
self._executor, executor.run,
log, self._active.repository, self._active.commit)
except asyncio.CancelledError:
break
except Exception as e:
log.error("%s", e, exc_info=True)
finally:
log.removeHandler(handler)
self._active = None
self._active_change_cbs.notify()
class _LogHandler(logging.Handler):
def __init__(self, db, repository, commit):
super().__init__()
self._db = db
self._repository
self._commit = commit
def emit(self, record):
self._db.add(
timestamp=datetime.datetime.fromtimestamp(
record.created, datetime.timezone.utc),
repository=self._repository,
commit=self._commit,
msg=record.getMessage())
class _DB:
def __init__(self, db_path):
db_path.parent.mkdir(exist_ok=True)
self._db = sqlite3.connect('file:{}?nolock=1'.format(db_path),
uri=True,
isolation_level=None,
detect_types=sqlite3.PARSE_DECLTYPES)
self._db.executescript("CREATE TABLE IF NOT EXISTS log ("
"timestamp TIMESTAMP, "
"repository TEXT, "
"commit TEXT, "
"msg TEXT)")
self._db.commit()
self._lock = threading.Lock()
def close(self):
with self._lock:
self._db.close()
def add(self, timestamp, repository, commit, msg):
with self._lock:
self._db.execute(
"INSERT INTO log VALUES "
"(:timestamp, :repository, :commit, :msg)",
{'timestamp': timestamp,
'repository': repository,
'commit': commit,
'msg': msg})
def query(self, offset, limit):
with self._lock:
c = self._db.execute(
"SELECT rowid, * FROM log ORDER BY rowid DESC "
"LIMIT :limit OFFSET :offset",
{'limit': limit, 'offset': offset})
try:
result = c.fetchall()
except Exception as e:
result = []
return [LogEntry(timestamp=i[1],
repository=i[2],
commit=i[3],
msg=i[4])
for i in result]
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