1 files changed, 145 insertions, 0 deletions
diff --git a/third_party/libwebrtc/build/fuchsia/emu_target.py b/third_party/libwebrtc/build/fuchsia/emu_target.py
new file mode 100644
index 0000000000..335f5418eb
--- /dev/null
+++ b/third_party/libwebrtc/build/fuchsia/emu_target.py
@@ -0,0 +1,145 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Implements commands for running/interacting with Fuchsia on an emulator."""
+
+import pkg_repo
+import boot_data
+import logging
+import os
+import runner_logs
+import subprocess
+import sys
+import target
+import tempfile
+
+
+class EmuTarget(target.Target):
+  def __init__(self, out_dir, target_cpu, system_log_file):
+    """out_dir: The directory which will contain the files that are
+                   generated to support the emulator deployment.
+    target_cpu: The emulated target CPU architecture.
+                Can be 'x64' or 'arm64'."""
+
+    super(EmuTarget, self).__init__(out_dir, target_cpu)
+    self._emu_process = None
+    self._system_log_file = system_log_file
+    self._pkg_repo = None
+
+  def __enter__(self):
+    return self
+
+  def _BuildCommand(self):
+    """Build the command that will be run to start Fuchsia in the emulator."""
+    pass
+
+  def _SetEnv(self):
+    return os.environ.copy()
+
+  # Used by the context manager to ensure that the emulator is killed when
+  # the Python process exits.
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self.Shutdown();
+
+  def Start(self):
+    emu_command = self._BuildCommand()
+
+    # We pass a separate stdin stream. Sharing stdin across processes
+    # leads to flakiness due to the OS prematurely killing the stream and the
+    # Python script panicking and aborting.
+    # The precise root cause is still nebulous, but this fix works.
+    # See crbug.com/741194.
+    logging.debug('Launching %s.' % (self.EMULATOR_NAME))
+    logging.debug(' '.join(emu_command))
+
+    # Zircon sends debug logs to serial port (see kernel.serial=legacy flag
+    # above). Serial port is redirected to a file through emulator stdout.
+    # If runner_logs are not enabled, we output the kernel serial log
+    # to a temporary file, and print that out if we are unable to connect to
+    # the emulator guest, to make it easier to diagnose connectivity issues.
+    temporary_log_file = None
+    if runner_logs.IsEnabled():
+      stdout = runner_logs.FileStreamFor('serial_log')
+    else:
+      temporary_log_file = tempfile.NamedTemporaryFile('w')
+      stdout = temporary_log_file
+
+    LogProcessStatistics('proc_stat_start_log')
+    LogSystemStatistics('system_statistics_start_log')
+
+    self._emu_process = subprocess.Popen(emu_command,
+                                         stdin=open(os.devnull),
+                                         stdout=stdout,
+                                         stderr=subprocess.STDOUT,
+                                         env=self._SetEnv())
+
+    try:
+      self._WaitUntilReady()
+      LogProcessStatistics('proc_stat_ready_log')
+    except target.FuchsiaTargetException:
+      if temporary_log_file:
+        logging.info('Kernel logs:\n' +
+                     open(temporary_log_file.name, 'r').read())
+      raise
+
+  def GetPkgRepo(self):
+    if not self._pkg_repo:
+      self._pkg_repo = pkg_repo.ManagedPkgRepo(self)
+
+    return self._pkg_repo
+
+  def Shutdown(self):
+    if not self._emu_process:
+      logging.error('%s did not start' % (self.EMULATOR_NAME))
+      return
+    returncode = self._emu_process.poll()
+    if returncode == None:
+      logging.info('Shutting down %s' % (self.EMULATOR_NAME))
+      self._emu_process.kill()
+    elif returncode == 0:
+      logging.info('%s quit unexpectedly without errors' % self.EMULATOR_NAME)
+    elif returncode < 0:
+      logging.error('%s was terminated by signal %d' %
+                    (self.EMULATOR_NAME, -returncode))
+    else:
+      logging.error('%s quit unexpectedly with exit code %d' %
+                    (self.EMULATOR_NAME, returncode))
+
+    LogProcessStatistics('proc_stat_end_log')
+    LogSystemStatistics('system_statistics_end_log')
+
+
+  def _IsEmuStillRunning(self):
+    if not self._emu_process:
+      return False
+    return os.waitpid(self._emu_process.pid, os.WNOHANG)[0] == 0
+
+  def _GetEndpoint(self):
+    if not self._IsEmuStillRunning():
+      raise Exception('%s quit unexpectedly.' % (self.EMULATOR_NAME))
+    return ('localhost', self._host_ssh_port)
+
+  def _GetSshConfigPath(self):
+    return boot_data.GetSSHConfigPath()
+
+
+def LogSystemStatistics(log_file_name):
+  statistics_log = runner_logs.FileStreamFor(log_file_name)
+  # Log the cpu load and process information.
+  subprocess.call(['top', '-b', '-n', '1'],
+                  stdin=open(os.devnull),
+                  stdout=statistics_log,
+                  stderr=subprocess.STDOUT)
+  subprocess.call(['ps', '-ax'],
+                  stdin=open(os.devnull),
+                  stdout=statistics_log,
+                  stderr=subprocess.STDOUT)
+
+
+def LogProcessStatistics(log_file_name):
+  statistics_log = runner_logs.FileStreamFor(log_file_name)
+  subprocess.call(['cat', '/proc/stat'],
+                  stdin=open(os.devnull),
+                  stdout=statistics_log,
+                  stderr=subprocess.STDOUT)