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import asyncio
import collections
import contextlib
import itertools
import multiprocessing
import subprocess
import sys
import time
import typing
from hat import aio
from hat import json
from hatter import common
import hatter.backend
async def create(conf: json.Data,
backend: hatter.backend.Backend
) -> 'Server':
server = Server()
server._conf = conf
server._backend = backend
server._async_group = aio.Group()
server._repos = set(conf['repos'].keys())
server._run_queue = aio.Queue()
server._sync_events = {}
for repo, repo_conf in conf['repos'].items():
sync_event = asyncio.Event()
server._sync_events[repo] = sync_event
server.async_group.spawn(server._sync_loop, repo, repo_conf,
sync_event)
for _ in range(multiprocessing.cpu_count()):
server.async_group.spawn(server._run_loop)
try:
commits = await backend.get_commits(repo=None,
statuses={common.Status.PENDING,
common.Status.RUNNING},
order=common.Order.ASC)
for commit in commits:
commit = commit._replace(change=int(time.time()),
status=common.Status.PENDING,
output='')
await backend.update_commit(commit)
server._run_queue.put_nowait(commit)
except BaseException:
await aio.uncancellable(server.async_close())
raise
return server
class Server(aio.Resource):
@property
def async_group(self):
return self._async_group
@property
def repos(self) -> typing.Set[str]:
return self._repos
async def get_commits(self,
repo: typing.Optional[str],
) -> typing.List[common.Commit]:
return await self._backend.get_commits(repo=repo,
statuses=None,
order=common.Order.DESC)
async def get_commit(self,
repo: str,
commit_hash: str
) -> typing.Optional[common.Commit]:
return await self._backend.get_commit(repo, commit_hash)
async def run_commit(self,
repo: str,
commit_hash: str
) -> common.Commit:
commit = common.Commit(repo=repo,
hash=commit_hash,
change=int(time.time()),
status=common.Status.PENDING,
output='')
await self._backend.update_commit(commit)
self._run_queue.put_nowait(commit)
return commit
def sync_repo(self, repo: str):
self._sync_events[repo].set()
async def remove_commit(self, commit: common.Commit):
await self._backend.remove_commit(commit)
async def _sync_loop(self, repo, repo_conf, sync_event):
try:
url = repo_conf['url']
refs = repo_conf.get('refs', ['refs/heads/*'])
min_sync_delay = repo_conf.get('min_sync_delay') or 0
max_sync_delay = repo_conf.get('max_sync_delay')
last_sync = time.monotonic() - min_sync_delay
while True:
dt = time.monotonic() - last_sync
if dt < min_sync_delay:
await asyncio.sleep(min_sync_delay - dt)
sync_event.clear()
commit_hashes = await _git_ls_remote(url, refs)
last_sync = time.monotonic()
for commit_hash in commit_hashes:
commit = await self._backend.get_commit(repo, commit_hash)
if commit:
continue
await self.run_commit(repo, commit_hash)
if max_sync_delay is None:
await sync_event.wait()
else:
with contextlib.suppress(asyncio.TimeoutError):
await asyncio.wait_for(sync_event.wait(),
max_sync_delay)
finally:
self.close()
async def _run_loop(self):
try:
while True:
commit = await self._run_queue.get()
repo_conf = self._conf['repos'][commit.repo]
action = repo_conf.get('action', '.hatter.yaml')
env = {**self._conf.get('env', {}),
**repo_conf.get('env', {})}
url = repo_conf['url']
ref = commit.hash
commit = commit._replace(change=int(time.time()),
status=common.Status.RUNNING,
output='')
await self._backend.update_commit(commit)
try:
output = await _execute(action=action,
env=env,
url=url,
ref=ref)
status = common.Status.SUCCESS
except Exception as e:
output = str(e)
status = common.Status.FAILURE
commit = commit._replace(change=int(time.time()),
status=status,
output=output)
await self._backend.update_commit(commit)
finally:
self.close()
async def _execute(action, env, url, ref):
cmd = [sys.executable, '-m', 'hatter', 'execute',
'--action', action,
*itertools.chain.from_iterable(('--env', i) for i in env),
url, ref]
p = await asyncio.create_subprocess_exec(cmd,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
env=env)
try:
output, _ = await p.communicate()
output = str(output, encoding='utf-8', errors='ignore')
if p.returncode:
raise Exception(output)
return output
finally:
if p.returncode is None:
p.terminate()
async def _git_ls_remote(url, refs):
cmd = ['git', 'ls-remote', url, *refs]
p = await asyncio.create_subprocess_exec(cmd,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
try:
stdout, stderr = await p.communicate()
if p.returncode:
stderr = str(stderr, encoding='utf-8', errors='ignore')
raise Exception(stderr)
result = collections.deque()
stdout = str(stdout, encoding='utf-8', errors='ignore')
for line in stdout.split('\n'):
segments = line.split(maxsplit=1)
if not segments:
continue
result.append(segments[0])
return result
except Exception:
return []
finally:
if p.returncode is None:
p.terminate()
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