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# This file is part of Buildbot. Buildbot is free software: you can
# redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, version 2.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright Buildbot Team Members
from __future__ import annotations
import os
import platform
from typing import TYPE_CHECKING
from typing import cast
from twisted.internet import defer
from twisted.internet import error
from twisted.internet import protocol
from twisted.internet import reactor
from twisted.internet.interfaces import ITransport
from twisted.protocols.basic import LineOnlyReceiver
from twisted.python.failure import Failure
from zope.interface import implementer
from buildbot_worker.compat import unicode2bytes
if TYPE_CHECKING:
from typing import Iterable
from twisted.internet.interfaces import IAddress
from twisted.internet.interfaces import IDelayedCall
from twisted.internet.interfaces import IReactorProcess
from twisted.internet.interfaces import IReactorTime
@implementer(ITransport)
class FakeTransport:
disconnecting = False
def write(self, data: bytes) -> None:
raise NotImplementedError()
def writeSequence(self, data: Iterable[bytes]) -> None:
raise NotImplementedError()
def loseConnection(self) -> None:
raise NotImplementedError()
def getPeer(self) -> IAddress:
raise NotImplementedError()
def getHost(self) -> IAddress:
raise NotImplementedError()
class WorkerTimeoutError(Exception):
pass
class TailProcess(protocol.ProcessProtocol):
lw: LogWatcher
def outReceived(self, data: bytes) -> None:
self.lw.dataReceived(unicode2bytes(data))
def errReceived(self, data: bytes) -> None:
print(f"ERR: '{data!r}'")
class LogWatcher(LineOnlyReceiver):
POLL_INTERVAL = 0.1
TIMEOUT_DELAY = 10.0
delimiter = unicode2bytes(os.linesep)
def __init__(self, logfile: str) -> None:
self.logfile = logfile
self.in_reconfig = False
self.transport = FakeTransport()
self.pp = TailProcess()
self.pp.lw = self
self.timer: IDelayedCall | None = None
self.d: defer.Deferred[str]
def start(self) -> defer.Deferred[str]:
# If the log file doesn't exist, create it now.
if not os.path.exists(self.logfile):
open(self.logfile, 'a').close()
# return a Deferred that fires when the start process has
# finished. It errbacks with TimeoutError if the finish line has not
# been seen within 10 seconds, and with ReconfigError if the error
# line was seen. If the logfile could not be opened, it errbacks with
# an IOError.
if platform.system().lower() == 'sunos' and os.path.exists('/usr/xpg4/bin/tail'):
tailBin = "/usr/xpg4/bin/tail"
elif platform.system().lower() == 'haiku' and os.path.exists('/bin/tail'):
tailBin = "/bin/tail"
else:
tailBin = "/usr/bin/tail"
self.p = cast("IReactorProcess", reactor).spawnProcess(
self.pp,
tailBin,
("tail", "-f", "-n", "0", self.logfile),
env=os.environ,
)
self.running = True
d = defer.maybeDeferred(self._start)
return d
def _start(self) -> defer.Deferred[str]:
self.d = defer.Deferred()
self.timer = cast("IReactorTime", reactor).callLater(self.TIMEOUT_DELAY, self.timeout)
return self.d
def timeout(self) -> None:
self.timer = None
e = WorkerTimeoutError()
self.finished(Failure(e))
def finished(self, results: str | Failure) -> None:
try:
self.p.signalProcess("KILL")
except error.ProcessExitedAlready:
pass
if self.timer:
self.timer.cancel()
self.timer = None
self.running = False
self.in_reconfig = False
self.d.callback(results)
def lineReceived(self, line: bytes) -> None:
if not self.running:
return None
if b"Log opened." in line:
self.in_reconfig = True
if b"loading configuration from" in line:
self.in_reconfig = True
if self.in_reconfig:
print(line)
if b"message from master: attached" in line:
return self.finished("buildbot-worker")
return None
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