Initial checkin of gRPC to third_party/

third_party/grpc/tools/run_tests/jobset.py

Index: third_party/grpc/tools/run_tests/jobset.py
diff --git a/third_party/grpc/tools/run_tests/jobset.py b/third_party/grpc/tools/run_tests/jobset.py
new file mode 100644
index 0000000000000000000000000000000000000000..a3b246dc084b295d17742d1e2b81d6caa4070a46
--- /dev/null
+++ b/third_party/grpc/tools/run_tests/jobset.py
@@ -0,0 +1,483 @@
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Run a group of subprocesses and then finish."""
+
+import hashlib
+import multiprocessing
+import os
+import platform
+import re
+import signal
+import subprocess
+import sys
+import tempfile
+import time
+
+
+# cpu cost measurement
+measure_cpu_costs = False
+
+
+_DEFAULT_MAX_JOBS = 16 * multiprocessing.cpu_count()
+_MAX_RESULT_SIZE = 8192
+
+def platform_string():
+  if platform.system() == 'Windows':
+    return 'windows'
+  elif platform.system()[:7] == 'MSYS_NT':
+    return 'windows'
+  elif platform.system() == 'Darwin':
+    return 'mac'
+  elif platform.system() == 'Linux':
+    return 'linux'
+  else:
+    return 'posix'
+
+
+# setup a signal handler so that signal.pause registers 'something'
+# when a child finishes
+# not using futures and threading to avoid a dependency on subprocess32
+if platform_string() == 'windows':
+  pass
+else:
+  have_alarm = False
+  def alarm_handler(unused_signum, unused_frame):
+    global have_alarm
+    have_alarm = False
+
+  signal.signal(signal.SIGCHLD, lambda unused_signum, unused_frame: None)
+  signal.signal(signal.SIGALRM, alarm_handler)
+
+
+_SUCCESS = object()
+_FAILURE = object()
+_RUNNING = object()
+_KILLED = object()
+
+
+_COLORS = {
+    'red': [ 31, 0 ],
+    'green': [ 32, 0 ],
+    'yellow': [ 33, 0 ],
+    'lightgray': [ 37, 0],
+    'gray': [ 30, 1 ],
+    'purple': [ 35, 0 ],
+    }
+
+
+_BEGINNING_OF_LINE = '\x1b[0G'
+_CLEAR_LINE = '\x1b[2K'
+
+
+_TAG_COLOR = {
+    'FAILED': 'red',
+    'FLAKE': 'purple',
+    'TIMEOUT_FLAKE': 'purple',
+    'WARNING': 'yellow',
+    'TIMEOUT': 'red',
+    'PASSED': 'green',
+    'START': 'gray',
+    'WAITING': 'yellow',
+    'SUCCESS': 'green',
+    'IDLE': 'gray',
+    }
+
+
+def message(tag, msg, explanatory_text=None, do_newline=False):
+  if message.old_tag == tag and message.old_msg == msg and not explanatory_text:
+    return
+  message.old_tag = tag
+  message.old_msg = msg
+  try:
+    if platform_string() == 'windows' or not sys.stdout.isatty():
+      if explanatory_text:
+        print explanatory_text
+      print '%s: %s' % (tag, msg)
+      return
+    sys.stdout.write('%s%s%s\x1b[%d;%dm%s\x1b[0m: %s%s' % (
+        _BEGINNING_OF_LINE,
+        _CLEAR_LINE,
+        '\n%s' % explanatory_text if explanatory_text is not None else '',
+        _COLORS[_TAG_COLOR[tag]][1],
+        _COLORS[_TAG_COLOR[tag]][0],
+        tag,
+        msg,
+        '\n' if do_newline or explanatory_text is not None else ''))
+    sys.stdout.flush()
+  except:
+    pass
+
+message.old_tag = ''
+message.old_msg = ''
+
+def which(filename):
+  if '/' in filename:
+    return filename
+  for path in os.environ['PATH'].split(os.pathsep):
+    if os.path.exists(os.path.join(path, filename)):
+      return os.path.join(path, filename)
+  raise Exception('%s not found' % filename)
+
+
+class JobSpec(object):
+  """Specifies what to run for a job."""
+
+  def __init__(self, cmdline, shortname=None, environ=None, hash_targets=None,
+               cwd=None, shell=False, timeout_seconds=5*60, flake_retries=0,
+               timeout_retries=0, kill_handler=None, cpu_cost=1.0):
+    """
+    Arguments:
+      cmdline: a list of arguments to pass as the command line
+      environ: a dictionary of environment variables to set in the child process
+      hash_targets: which files to include in the hash representing the jobs version
+                    (or empty, indicating the job should not be hashed)
+      kill_handler: a handler that will be called whenever job.kill() is invoked
+      cpu_cost: number of cores per second this job needs
+    """
+    if environ is None:
+      environ = {}
+    if hash_targets is None:
+      hash_targets = []
+    self.cmdline = cmdline
+    self.environ = environ
+    self.shortname = cmdline[0] if shortname is None else shortname
+    self.hash_targets = hash_targets or []
+    self.cwd = cwd
+    self.shell = shell
+    self.timeout_seconds = timeout_seconds
+    self.flake_retries = flake_retries
+    self.timeout_retries = timeout_retries
+    self.kill_handler = kill_handler
+    self.cpu_cost = cpu_cost
+
+  def identity(self):
+    return '%r %r %r' % (self.cmdline, self.environ, self.hash_targets)
+
+  def __hash__(self):
+    return hash(self.identity())
+
+  def __cmp__(self, other):
+    return self.identity() == other.identity()
+
+  def __repr__(self):
+    return 'JobSpec(shortname=%s, cmdline=%s)' % (self.shortname, self.cmdline)
+
+
+class JobResult(object):
+  def __init__(self):
+    self.state = 'UNKNOWN'
+    self.returncode = -1
+    self.elapsed_time = 0
+    self.num_failures = 0
+    self.retries = 0
+    self.message = ''
+
+
+class Job(object):
+  """Manages one job."""
+
+  def __init__(self, spec, bin_hash, newline_on_success, travis, add_env):
+    self._spec = spec
+    self._bin_hash = bin_hash
+    self._newline_on_success = newline_on_success
+    self._travis = travis
+    self._add_env = add_env.copy()
+    self._retries = 0
+    self._timeout_retries = 0
+    self._suppress_failure_message = False
+    message('START', spec.shortname, do_newline=self._travis)
+    self.result = JobResult()
+    self.start()
+
+  def GetSpec(self):
+    return self._spec
+
+  def start(self):
+    self._tempfile = tempfile.TemporaryFile()
+    env = dict(os.environ)
+    env.update(self._spec.environ)
+    env.update(self._add_env)
+    self._start = time.time()
+    cmdline = self._spec.cmdline
+    if measure_cpu_costs:
+      cmdline = ['time', '--portability'] + cmdline
+    try_start = lambda: subprocess.Popen(args=cmdline,
+                                         stderr=subprocess.STDOUT,
+                                         stdout=self._tempfile,
+                                         cwd=self._spec.cwd,
+                                         shell=self._spec.shell,
+                                         env=env)
+    delay = 0.3
+    for i in range(0, 4):
+      try:
+        self._process = try_start()
+        break
+      except OSError:
+        message('WARNING', 'Failed to start %s, retrying in %f seconds' % (self._spec.shortname, delay))
+        time.sleep(delay)
+        delay *= 2
+    else:
+      self._process = try_start()
+    self._state = _RUNNING
+
+  def state(self, update_cache):
+    """Poll current state of the job. Prints messages at completion."""
+    def stdout(self=self):
+      self._tempfile.seek(0)
+      stdout = self._tempfile.read()
+      self.result.message = stdout[-_MAX_RESULT_SIZE:]
+      return stdout
+    if self._state == _RUNNING and self._process.poll() is not None:
+      elapsed = time.time() - self._start
+      self.result.elapsed_time = elapsed
+      if self._process.returncode != 0:
+        if self._retries < self._spec.flake_retries:
+          message('FLAKE', '%s [ret=%d, pid=%d]' % (
+            self._spec.shortname, self._process.returncode, self._process.pid),
+            stdout(), do_newline=True)
+          self._retries += 1
+          self.result.num_failures += 1
+          self.result.retries = self._timeout_retries + self._retries
+          self.start()
+        else:
+          self._state = _FAILURE
+          if not self._suppress_failure_message:
+            message('FAILED', '%s [ret=%d, pid=%d]' % (
+                self._spec.shortname, self._process.returncode, self._process.pid),
+                stdout(), do_newline=True)
+          self.result.state = 'FAILED'
+          self.result.num_failures += 1
+          self.result.returncode = self._process.returncode
+      else:
+        self._state = _SUCCESS
+        measurement = ''
+        if measure_cpu_costs:
+          m = re.search(r'real ([0-9.]+)\nuser ([0-9.]+)\nsys ([0-9.]+)', stdout())
+          real = float(m.group(1))
+          user = float(m.group(2))
+          sys = float(m.group(3))
+          if real > 0.5:
+            cores = (user + sys) / real
+            measurement = '; cpu_cost=%.01f; estimated=%.01f' % (cores, self._spec.cpu_cost)
+        message('PASSED', '%s [time=%.1fsec; retries=%d:%d%s]' % (
+                    self._spec.shortname, elapsed, self._retries, self._timeout_retries, measurement),
+            do_newline=self._newline_on_success or self._travis)
+        self.result.state = 'PASSED'
+        if self._bin_hash:
+          update_cache.finished(self._spec.identity(), self._bin_hash)
+    elif (self._state == _RUNNING and
+          self._spec.timeout_seconds is not None and
+          time.time() - self._start > self._spec.timeout_seconds):
+      if self._timeout_retries < self._spec.timeout_retries:
+        message('TIMEOUT_FLAKE', '%s [pid=%d]' % (self._spec.shortname, self._process.pid), stdout(), do_newline=True)
+        self._timeout_retries += 1
+        self.result.num_failures += 1
+        self.result.retries = self._timeout_retries + self._retries
+        if self._spec.kill_handler:
+          self._spec.kill_handler(self)
+        self._process.terminate()
+        self.start()
+      else:
+        message('TIMEOUT', '%s [pid=%d]' % (self._spec.shortname, self._process.pid), stdout(), do_newline=True)
+        self.kill()
+        self.result.state = 'TIMEOUT'
+        self.result.num_failures += 1
+    return self._state
+
+  def kill(self):
+    if self._state == _RUNNING:
+      self._state = _KILLED
+      if self._spec.kill_handler:
+        self._spec.kill_handler(self)
+      self._process.terminate()
+
+  def suppress_failure_message(self):
+    self._suppress_failure_message = True
+
+
+class Jobset(object):
+  """Manages one run of jobs."""
+
+  def __init__(self, check_cancelled, maxjobs, newline_on_success, travis,
+               stop_on_failure, add_env, cache):
+    self._running = set()
+    self._check_cancelled = check_cancelled
+    self._cancelled = False
+    self._failures = 0
+    self._completed = 0
+    self._maxjobs = maxjobs
+    self._newline_on_success = newline_on_success
+    self._travis = travis
+    self._cache = cache
+    self._stop_on_failure = stop_on_failure
+    self._hashes = {}
+    self._add_env = add_env
+    self.resultset = {}
+    self._remaining = None
+
+  def set_remaining(self, remaining):
+    self._remaining = remaining
+
+  def get_num_failures(self):
+    return self._failures
+
+  def cpu_cost(self):
+    c = 0
+    for job in self._running:
+      c += job._spec.cpu_cost
+    return c
+
+  def start(self, spec):
+    """Start a job. Return True on success, False on failure."""
+    while True:
+      if self.cancelled(): return False
+      current_cpu_cost = self.cpu_cost()
+      if current_cpu_cost == 0: break
+      if current_cpu_cost + spec.cpu_cost <= self._maxjobs: break
+      self.reap()
+    if self.cancelled(): return False
+    if spec.hash_targets:
+      if spec.identity() in self._hashes:
+        bin_hash = self._hashes[spec.identity()]
+      else:
+        bin_hash = hashlib.sha1()
+        for fn in spec.hash_targets:
+          with open(which(fn)) as f:
+            bin_hash.update(f.read())
+        bin_hash = bin_hash.hexdigest()
+        self._hashes[spec.identity()] = bin_hash
+      should_run = self._cache.should_run(spec.identity(), bin_hash)
+    else:
+      bin_hash = None
+      should_run = True
+    if should_run:
+      job = Job(spec,
+                bin_hash,
+                self._newline_on_success,
+                self._travis,
+                self._add_env)
+      self._running.add(job)
+      if not self.resultset.has_key(job.GetSpec().shortname):
+        self.resultset[job.GetSpec().shortname] = []
+    return True
+
+  def reap(self):
+    """Collect the dead jobs."""
+    while self._running:
+      dead = set()
+      for job in self._running:
+        st = job.state(self._cache)
+        if st == _RUNNING: continue
+        if st == _FAILURE or st == _KILLED:
+          self._failures += 1
+          if self._stop_on_failure:
+            self._cancelled = True
+            for job in self._running:
+              job.kill()
+        dead.add(job)
+        break
+      for job in dead:
+        self._completed += 1
+        self.resultset[job.GetSpec().shortname].append(job.result)
+        self._running.remove(job)
+      if dead: return
+      if (not self._travis):
+        rstr = '' if self._remaining is None else '%d queued, ' % self._remaining
+        message('WAITING', '%s%d jobs running, %d complete, %d failed' % (
+            rstr, len(self._running), self._completed, self._failures))
+      if platform_string() == 'windows':
+        time.sleep(0.1)
+      else:
+        global have_alarm
+        if not have_alarm:
+          have_alarm = True
+          signal.alarm(10)
+        signal.pause()
+
+  def cancelled(self):
+    """Poll for cancellation."""
+    if self._cancelled: return True
+    if not self._check_cancelled(): return False
+    for job in self._running:
+      job.kill()
+    self._cancelled = True
+    return True
+
+  def finish(self):
+    while self._running:
+      if self.cancelled(): pass  # poll cancellation
+      self.reap()
+    return not self.cancelled() and self._failures == 0
+
+
+def _never_cancelled():
+  return False
+
+
+# cache class that caches nothing
+class NoCache(object):
+  def should_run(self, cmdline, bin_hash):
+    return True
+
+  def finished(self, cmdline, bin_hash):
+    pass
+
+
+def tag_remaining(xs):
+  staging = []
+  for x in xs:
+    staging.append(x)
+    if len(staging) > 1000:
+      yield (staging.pop(0), None)
+  n = len(staging)
+  for i, x in enumerate(staging):
+    yield (x, n - i - 1)
+
+
+def run(cmdlines,
+        check_cancelled=_never_cancelled,
+        maxjobs=None,
+        newline_on_success=False,
+        travis=False,
+        infinite_runs=False,
+        stop_on_failure=False,
+        cache=None,
+        add_env={}):
+  js = Jobset(check_cancelled,
+              maxjobs if maxjobs is not None else _DEFAULT_MAX_JOBS,
+              newline_on_success, travis, stop_on_failure, add_env,
+              cache if cache is not None else NoCache())
+  for cmdline, remaining in tag_remaining(cmdlines):
+    if not js.start(cmdline):
+      break
+    if remaining is not None:
+      js.set_remaining(remaining)
+  js.finish()
+  return js.get_num_failures(), js.resultset