mirror of
https://github.com/GothenburgBitFactory/timewarrior.git
synced 2025-06-26 10:54:28 +02:00
376 lines
11 KiB
Python
376 lines
11 KiB
Python
from __future__ import division
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import atexit
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import functools
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import os
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import signal
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import sys
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import tempfile
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from subprocess import Popen, PIPE, STDOUT
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from threading import Thread
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try:
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from Queue import Queue, Empty
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except ImportError:
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from queue import Queue, Empty
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from time import sleep
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try:
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import simplejson as json
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except ImportError:
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import json
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from .exceptions import CommandError, TimeoutWaitingFor
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ON_POSIX = "posix" in sys.builtin_module_names
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# Directory relative to basetest module location
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CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
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# Location of binary files (usually the src/ folder)
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BIN_PREFIX = os.path.abspath(
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os.path.join(CURRENT_DIR, "..", "..", "src")
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)
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# Default location of test certificates
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DEFAULT_CERT_PATH = os.path.abspath(
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os.path.join(CURRENT_DIR, "..", "test_certs")
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)
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# Default location of test extensions
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DEFAULT_EXTENSION_PATH = os.path.abspath(
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os.path.join(CURRENT_DIR, "..", "test_extensions")
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)
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# Environment flags to control skipping of timew tests
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TIMEW_SKIP = os.environ.get("TIMEW_SKIP", False)
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# Environment flags to control use of PATH or in-tree binaries
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TIMEW_USE_PATH = os.environ.get("TIMEW_USE_PATH", False)
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UUID_REGEXP = ("[0-9A-Fa-f]{8}-" + ("[0-9A-Fa-f]{4}-" * 3) + "[0-9A-Fa-f]{12}")
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def timew_binary_location(cmd="timew"):
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""" ../src/ is used by default."""
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return os.path.join(BIN_PREFIX, cmd)
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def binary_location(cmd, USE_PATH=False):
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""" ../src/ is used by default."""
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return os.path.join(BIN_PREFIX, cmd)
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def wait_condition(cond, timeout=1, sleeptime=.01):
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"""Wait for condition to return anything other than None"""
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# NOTE Increasing sleeptime can dramatically increase testsuite runtime
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# It also reduces CPU load significantly
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if timeout is None:
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timeout = 1
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if timeout < sleeptime:
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print("Warning, timeout cannot be smaller than", sleeptime)
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timeout = sleeptime
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# Max number of attempts until giving up
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tries = int(timeout / sleeptime)
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for i in range(tries):
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val = cond()
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if val is not None:
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break
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sleep(sleeptime)
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return val
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def wait_process(pid, timeout=None):
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"""Wait for process to finish"""
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def process():
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try:
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os.kill(pid, 0)
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except OSError:
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# Process is dead
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return True
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else:
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# Process is still ticking
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return None
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return wait_condition(process, timeout)
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def _queue_output(arguments, pidq, outputq):
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"""Read/Write output/input of given process.
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This function is meant to be executed in a thread as it may block
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"""
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kwargs = arguments["process"]
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input = arguments["input"]
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try:
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proc = Popen(**kwargs)
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except OSError as e:
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# pid None is read by the main thread as a crash of the process
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pidq.put(None)
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outputq.put((
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"",
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("Unexpected exception caught during execution: '{0}' . ".format(e)),
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255)) # false exitcode
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return
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# Put the PID in the queue for main process to know.
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pidq.put(proc.pid)
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# Send input and wait for finish
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out, err = proc.communicate(input)
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if sys.version_info > (3,):
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out, err = out.decode("utf-8"), err.decode("utf-8")
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# Give the output back to the caller
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outputq.put((out, err, proc.returncode))
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def _retrieve_output(thread, timeout, queue, thread_error):
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"""Fetch output from binary subprocess queues"""
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# Try to join the thread on failure abort
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thread.join(timeout)
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if thread.is_alive():
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# Join should have killed the thread. This is unexpected
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raise TimeoutWaitingFor(thread_error + ". Unexpected error")
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# Thread died so we should have output
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try:
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# data = (stdout, stderr, exitcode)
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data = queue.get(timeout=timeout)
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except Empty:
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data = TimeoutWaitingFor("streams from program")
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return data
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def _get_output(arguments, timeout=None):
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"""Collect output from the subprocess without blocking the main process if
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subprocess hangs.
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"""
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# NOTE Increase this value if tests fail with None being received as
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# stdout/stderr instead of the expected content
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output_timeout = 0.1 # seconds
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pidq = Queue()
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outputq = Queue()
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t = Thread(target=_queue_output, args=(arguments, pidq, outputq))
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t.daemon = True
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t.start()
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try:
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pid = pidq.get(timeout=timeout)
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except Empty:
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pid = None
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# Process crashed or timed out for some reason
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if pid is None:
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return _retrieve_output(t, output_timeout, outputq, "Program to start")
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# Wait for process to finish (normal execution)
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state = wait_process(pid, timeout)
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if state:
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# Process finished
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return _retrieve_output(t, output_timeout, outputq, "Program thread to join")
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# If we reach this point we assume the process got stuck or timed out
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for sig in (signal.SIGABRT, signal.SIGTERM, signal.SIGKILL):
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# Start with lower signals and escalate if process ignores them
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try:
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os.kill(pid, signal.SIGABRT)
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except OSError as e:
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# 3 means the process finished/died between last check and now
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if e.errno != 3:
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raise
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# Wait for process to finish (should die/exit after signal)
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state = wait_process(pid, timeout)
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if state:
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# Process finished
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return _retrieve_output(t, output_timeout, outputq, "Program to die")
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# This should never happen but in case something goes really bad
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raise OSError("Program stopped responding and couldn't be killed")
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def run_cmd_wait(cmd, input=None, stdout=PIPE, stderr=PIPE,
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merge_streams=False, env=os.environ, timeout=None):
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"""Run a subprocess and wait for it to finish"""
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if input is None:
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stdin = None
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else:
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stdin = PIPE
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if merge_streams:
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stderr = STDOUT
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else:
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stderr = PIPE
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arguments = {
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"process": {
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"args": cmd,
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"stdin": stdin,
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"stdout": stdout,
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"stderr": stderr,
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"bufsize": -1,
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"close_fds": ON_POSIX,
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"env": env,
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},
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"input": input,
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}
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out, err, exit = _get_output(arguments, timeout)
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if merge_streams:
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if exit != 0:
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raise CommandError(cmd, exit, out)
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else:
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return exit, out
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else:
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if exit != 0:
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raise CommandError(cmd, exit, out, err)
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else:
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return exit, out, err
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def run_cmd_wait_nofail(*args, **kwargs):
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"""Same as run_cmd_wait but silence the exception if it happens"""
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try:
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return run_cmd_wait(*args, **kwargs)
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except CommandError as e:
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return e.code, e.out, e.err
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def memoize(obj):
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"""Keep an in-memory cache of function results given its inputs"""
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cache = obj.cache = {}
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@functools.wraps(obj)
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def memoizer(*args, **kwargs):
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key = str(args) + str(kwargs)
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if key not in cache:
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cache[key] = obj(*args, **kwargs)
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return cache[key]
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return memoizer
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try:
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from shutil import which
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which = memoize(which)
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except ImportError:
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# NOTE: This is shutil.which backported from python-3.3.3
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@memoize
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def which(cmd, mode=os.F_OK | os.X_OK, path=None):
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"""Given a command, mode, and a PATH string, return the path which
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conforms to the given mode on the PATH, or None if there is no such
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file.
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`mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
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of os.environ.get("PATH"), or can be overridden with a custom search
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path.
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"""
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# Check that a given file can be accessed with the correct mode.
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# Additionally check that `file` is not a directory, as on Windows
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# directories pass the os.access check.
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def _access_check(fn, mode):
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return (os.path.exists(fn) and os.access(fn, mode) and
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not os.path.isdir(fn))
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# If we're given a path with a directory part, look it up directly
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# rather than referring to PATH directories. This includes checking
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# relative to the current directory, e.g. ./script
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if os.path.dirname(cmd):
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if _access_check(cmd, mode):
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return cmd
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return None
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if path is None:
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path = os.environ.get("PATH", os.defpath)
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if not path:
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return None
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path = path.split(os.pathsep)
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if sys.platform == "win32":
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# The current directory takes precedence on Windows.
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if os.curdir not in path:
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path.insert(0, os.curdir)
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# PATHEXT is necessary to check on Windows.
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pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
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# See if the given file matches any of the expected path
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# extensions. This will allow us to short circuit when given
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# "python.exe". If it does match, only test that one, otherwise we
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# have to try others.
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if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
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files = [cmd]
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else:
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files = [cmd + ext for ext in pathext]
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else:
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# On other platforms you don't have things like PATHEXT to tell you
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# what file suffixes are executable, so just pass on cmd as-is.
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files = [cmd]
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seen = set()
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for dir in path:
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normdir = os.path.normcase(dir)
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if normdir not in seen:
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seen.add(normdir)
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for thefile in files:
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name = os.path.join(dir, thefile)
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if _access_check(name, mode):
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return name
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return None
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def parse_datafile(file):
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"""Parse .data files, treating files as JSON"""
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data = []
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with open(file) as fh:
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for line in fh:
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line = line.rstrip("\n")
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# Turn [] strings into {} to be treated properly as JSON hashes
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if line.startswith("[") and line.endswith("]"):
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line = "{" + line[1:-1] + "}"
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if line.startswith("{"):
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data.append(json.loads(line))
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else:
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data.append(line)
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return data
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def mkstemp(data):
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"""Create a temporary file that is removed at process exit"""
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def rmtemp(name):
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try:
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os.remove(name)
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except OSError:
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pass
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f = tempfile.NamedTemporaryFile(delete=False)
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f.write(data)
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f.close()
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# Ensure removal at end of python session
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atexit.register(rmtemp, f.name)
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return f.name
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def mkstemp_exec(data):
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"""Create a temporary executable file that is removed at process exit"""
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name = mkstemp(data)
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os.chmod(name, 0o755)
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return name
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