mirror of
https://github.com/ClickHouse/ClickHouse.git
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211 lines
6.3 KiB
Python
211 lines
6.3 KiB
Python
# Copyright (c) 2019 Vitaliy Zakaznikov
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import pty
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import re
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import time
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from queue import Queue, Empty
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from subprocess import Popen
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from threading import Thread, Event
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class TimeoutError(Exception):
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def __init__(self, timeout):
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self.timeout = timeout
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def __str__(self):
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return 'Timeout %.3fs' % float(self.timeout)
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class ExpectTimeoutError(Exception):
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def __init__(self, pattern, timeout, buffer):
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self.pattern = pattern
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self.timeout = timeout
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self.buffer = buffer
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def __str__(self):
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s = 'Timeout %.3fs ' % float(self.timeout)
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if self.pattern:
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s += 'for %s ' % repr(self.pattern.pattern)
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if self.buffer:
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s += 'buffer %s ' % repr(self.buffer[:])
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s += 'or \'%s\'' % ','.join(['%x' % ord(c) for c in self.buffer[:]])
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return s
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class IO(object):
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class EOF(object):
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pass
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class Timeout(object):
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pass
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EOF = EOF
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TIMEOUT = Timeout
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class Logger(object):
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def __init__(self, logger, prefix=''):
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self._logger = logger
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self._prefix = prefix
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def write(self, data):
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self._logger.write(('\n' + data).replace('\n', '\n' + self._prefix))
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def flush(self):
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self._logger.flush()
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def __init__(self, process, master, queue, reader):
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self.process = process
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self.master = master
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self.queue = queue
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self.buffer = None
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self.before = None
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self.after = None
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self.match = None
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self.pattern = None
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self.reader = reader
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self._timeout = None
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self._logger = None
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self._eol = ''
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def logger(self, logger=None, prefix=''):
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if logger:
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self._logger = self.Logger(logger, prefix=prefix)
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return self._logger
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def timeout(self, timeout=None):
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if timeout:
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self._timeout = timeout
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return self._timeout
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def eol(self, eol=None):
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if eol:
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self._eol = eol
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return self._eol
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def close(self, force=True):
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self.reader['kill_event'].set()
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os.system('pkill -TERM -P %d' % self.process.pid)
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if force:
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self.process.kill()
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else:
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self.process.terminate()
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os.close(self.master)
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if self._logger:
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self._logger.write('\n')
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self._logger.flush()
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def send(self, data, eol=None):
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if eol is None:
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eol = self._eol
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return self.write(data + eol)
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def write(self, data):
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return os.write(self.master, data.encode())
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def expect(self, pattern, timeout=None, escape=False):
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self.match = None
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self.before = None
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self.after = None
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if escape:
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pattern = re.escape(pattern)
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pattern = re.compile(pattern)
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if timeout is None:
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timeout = self._timeout
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timeleft = timeout
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while True:
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start_time = time.time()
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if self.buffer is not None:
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self.match = pattern.search(self.buffer, 0)
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if self.match is not None:
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self.after = self.buffer[self.match.start():self.match.end()]
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self.before = self.buffer[:self.match.start()]
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self.buffer = self.buffer[self.match.end():]
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break
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if timeleft < 0:
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break
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try:
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data = self.read(timeout=timeleft, raise_exception=True)
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except TimeoutError:
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if self._logger:
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self._logger.write((self.buffer or '') + '\n')
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self._logger.flush()
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exception = ExpectTimeoutError(pattern, timeout, self.buffer)
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self.buffer = None
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raise exception
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timeleft -= (time.time() - start_time)
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if data:
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self.buffer = (self.buffer + data) if self.buffer else data
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if self._logger:
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self._logger.write((self.before or '') + (self.after or ''))
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self._logger.flush()
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if self.match is None:
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exception = ExpectTimeoutError(pattern, timeout, self.buffer)
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self.buffer = None
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raise exception
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return self.match
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def read(self, timeout=0, raise_exception=False):
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data = ''
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timeleft = timeout
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try:
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while timeleft >= 0:
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start_time = time.time()
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data += self.queue.get(timeout=timeleft)
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if data:
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break
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timeleft -= (time.time() - start_time)
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except Empty:
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if data:
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return data
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if raise_exception:
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raise TimeoutError(timeout)
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pass
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if not data and raise_exception:
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raise TimeoutError(timeout)
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return data
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def spawn(command):
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master, slave = pty.openpty()
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process = Popen(command, preexec_fn=os.setsid, stdout=slave, stdin=slave, stderr=slave, bufsize=1)
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os.close(slave)
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queue = Queue()
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reader_kill_event = Event()
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thread = Thread(target=reader, args=(process, master, queue, reader_kill_event))
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thread.daemon = True
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thread.start()
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return IO(process, master, queue, reader={'thread': thread, 'kill_event': reader_kill_event})
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def reader(process, out, queue, kill_event):
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while True:
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try:
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# TODO: there are some issues with 1<<16 buffer size
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data = os.read(out, 1<<17).decode(errors='replace')
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queue.put(data)
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except:
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if kill_event.is_set():
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break
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raise
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