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#
# Copyright (C) 2017 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import logging
import socket
import time
import uuid
import httplib2
from googleapiclient import errors
from host_controller import invocation_thread
from host_controller.tradefed import remote_operation
from host_controller.tfc import command_attempt
class HostController(object):
"""The class that relays commands between a TradeFed host and clusters.
Attributes:
_remote_client: The RemoteClient which runs commands.
_tfc_client: The TfcClient from which the command tasks are leased.
_hostname: A string, the name of the TradeFed host.
_cluster_ids: A list of strings, the cluster IDs for leasing tasks.
_invocation_threads: The list of running InvocationThread.
"""
def __init__(self, remote_client, tfc_client, hostname, cluster_ids):
"""Initializes the attributes."""
self._remote_client = remote_client
self._tfc_client = tfc_client
self._hostname = hostname
self._cluster_ids = cluster_ids
self._invocation_threads = []
@property
def hostname(self):
"""Returns the name of the host."""
return self._hostname
def _JoinInvocationThreads(self):
"""Removes terminated threads from _invocation_threads."""
alive_threads = []
for inv_thread in self._invocation_threads:
inv_thread.join(0)
if inv_thread.is_alive():
alive_threads.append(inv_thread)
self._invocation_threads = alive_threads
def _CreateInvocationThread(self, task):
"""Creates an invocation thread from a command task.
Args:
task: The CommandTask object.
Returns:
An InvocationThread.
"""
attempt_id = uuid.uuid4()
attempt = command_attempt.CommandAttempt(
task.task_id, attempt_id,
self._hostname, task.device_serials[0])
inv_thread = invocation_thread.InvocationThread(
self._remote_client, self._tfc_client, attempt,
task.command_line.split(), task.device_serials)
return inv_thread
def ListDevices(self):
"""Lists present devices on the host.
Returns:
A list of DeviceInfo.
"""
devices = self._remote_client.ListDevices()
return [dev for dev in devices if not dev.IsStub()]
def ListAvailableDevices(self):
"""Lists available devices for command tasks.
Returns:
A list of DeviceInfo.
"""
self._JoinInvocationThreads()
allocated_serials = set()
for inv_thread in self._invocation_threads:
allocated_serials.update(inv_thread.device_serials)
present_devices = self.ListDevices()
return [dev for dev in present_devices if
dev.IsAvailable() and
dev.device_serial not in allocated_serials]
def LeaseCommandTasks(self):
"""Leases command tasks and creates threads to execute them.
Returns:
A list of CommandTask. The leased command tasks.
"""
available_devices = self.ListAvailableDevices()
if not available_devices:
return []
tasks = self._tfc_client.LeaseHostTasks(
self._cluster_ids[0], self._cluster_ids[1:],
self._hostname, available_devices)
for task in tasks:
inv_thread = self._CreateInvocationThread(task)
inv_thread.daemon = True
inv_thread.start()
self._invocation_threads.append(inv_thread)
return tasks
def Run(self, poll_interval):
"""Starts polling TFC for tasks.
Args:
poll_interval: The poll interval in seconds.
"""
while True:
try:
self.LeaseCommandTasks()
except (socket.error,
remote_operation.RemoteOperationException,
httplib2.HttpLib2Error,
errors.HttpError) as e:
logging.exception(e)
time.sleep(poll_interval)
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