"""Provides a factory method to create a host object."""
import logging
from contextlib import closing
from autotest_lib.client.bin import local_host
from autotest_lib.client.bin import utils
from autotest_lib.client.common_lib import error, global_config
from autotest_lib.server import utils as server_utils
from autotest_lib.server.cros.dynamic_suite import constants
from autotest_lib.server.hosts import adb_host, cros_host, emulated_adb_host
from autotest_lib.server.hosts import iota_host, moblab_host, sonic_host
from autotest_lib.server.hosts import ssh_host, testbed
CONFIG = global_config.global_config
SSH_ENGINE = CONFIG.get_config_value('AUTOSERV', 'ssh_engine', type=str)
# Default ssh options used in creating a host.
DEFAULT_SSH_USER = 'root'
DEFAULT_SSH_PASS = ''
DEFAULT_SSH_PORT = 22
DEFAULT_SSH_VERBOSITY = ''
DEFAULT_SSH_OPTIONS = ''
# for tracking which hostnames have already had job_start called
_started_hostnames = set()
# A list of all the possible host types, ordered according to frequency of
# host types in the lab, so the more common hosts don't incur a repeated ssh
# overhead in checking for less common host types.
host_types = [cros_host.CrosHost, moblab_host.MoblabHost, sonic_host.SonicHost,
adb_host.ADBHost,]
OS_HOST_DICT = {'android': adb_host.ADBHost,
'brillo': adb_host.ADBHost,
'cros' : cros_host.CrosHost,
'emulated_brillo': emulated_adb_host.EmulatedADBHost,
'iota': iota_host.IotaHost,
'moblab': moblab_host.MoblabHost}
def _get_host_arguments(machine):
"""Get parameters to construct a host object.
There are currently 2 use cases for creating a host.
1. Through the server_job, in which case the server_job injects
the appropriate ssh parameters into our name space and they
are available as the variables ssh_user, ssh_pass etc.
2. Directly through factory.create_host, in which case we use
the same defaults as used in the server job to create a host.
@param machine: machine dict
@return: A dictionary containing arguments for host specifically hostname,
afe_host, user, password, port, ssh_verbosity_flag and
ssh_options.
"""
hostname, afe_host = server_utils.get_host_info_from_machine(
machine)
g = globals()
user = afe_host.attributes.get('ssh_user', g.get('ssh_user',
DEFAULT_SSH_USER))
password = afe_host.attributes.get('ssh_pass', g.get('ssh_pass',
DEFAULT_SSH_PASS))
port = afe_host.attributes.get('ssh_port', g.get('ssh_port',
DEFAULT_SSH_PORT))
ssh_verbosity_flag = afe_host.attributes.get('ssh_verbosity_flag',
g.get('ssh_verbosity_flag',
DEFAULT_SSH_VERBOSITY))
ssh_options = afe_host.attributes.get('ssh_options',
g.get('ssh_options',
DEFAULT_SSH_OPTIONS))
hostname, user, password, port = server_utils.parse_machine(hostname, user,
password, port)
host_args = {
'hostname': hostname,
'afe_host': afe_host,
'user': user,
'password': password,
'port': int(port),
'ssh_verbosity_flag': ssh_verbosity_flag,
'ssh_options': ssh_options,
}
if isinstance(machine, dict) and 'host_info_store' in machine:
host_args['host_info_store'] = machine['host_info_store']
return host_args
def _detect_host(connectivity_class, hostname, **args):
"""Detect host type.
Goes through all the possible host classes, calling check_host with a
basic host object. Currently this is an ssh host, but theoretically it
can be any host object that the check_host method of appropriate host
type knows to use.
@param connectivity_class: connectivity class to use to talk to the host
(ParamikoHost or SSHHost)
@param hostname: A string representing the host name of the device.
@param args: Args that will be passed to the constructor of
the host class.
@returns: Class type of the first host class that returns True to the
check_host method.
"""
# TODO crbug.com/302026 (sbasi) - adjust this pathway for ADBHost in
# the future should a host require verify/repair.
with closing(connectivity_class(hostname, **args)) as host:
for host_module in host_types:
if host_module.check_host(host, timeout=10):
return host_module
logging.warning('Unable to apply conventional host detection methods, '
'defaulting to chromeos host.')
return cros_host.CrosHost
def _choose_connectivity_class(hostname, ssh_port):
"""Choose a connectivity class for this hostname.
@param hostname: hostname that we need a connectivity class for.
@param ssh_port: SSH port to connect to the host.
@returns a connectivity host class.
"""
if (hostname == 'localhost' and ssh_port == DEFAULT_SSH_PORT):
return local_host.LocalHost
# by default assume we're using SSH support
elif SSH_ENGINE == 'raw_ssh':
return ssh_host.SSHHost
else:
raise error.AutoservError("Unknown SSH engine %s. Please verify the "
"value of the configuration key 'ssh_engine' "
"on autotest's global_config.ini file." %
SSH_ENGINE)
# TODO(kevcheng): Update the creation method so it's not a research project
# determining the class inheritance model.
def create_host(machine, host_class=None, connectivity_class=None, **args):
"""Create a host object.
This method mixes host classes that are needed into a new subclass
and creates a instance of the new class.
@param machine: A dict representing the device under test or a String
representing the DUT hostname (for legacy caller support).
If it is a machine dict, the 'hostname' key is required.
Optional 'afe_host' key will pipe in afe_host
from the autoserv runtime or the AFE.
@param host_class: Host class to use, if None, will attempt to detect
the correct class.
@param connectivity_class: Connectivity class to use, if None will decide
based off of hostname and config settings.
@param args: Args that will be passed to the constructor of
the new host class.
@returns: A host object which is an instance of the newly created
host class.
"""
detected_args = _get_host_arguments(machine)
hostname = detected_args.pop('hostname')
afe_host = detected_args['afe_host']
args.update(detected_args)
host_os = None
full_os_prefix = constants.OS_PREFIX + ':'
# Let's grab the os from the labels if we can for host class detection.
for label in afe_host.labels:
if label.startswith(full_os_prefix):
host_os = label[len(full_os_prefix):]
break
if not connectivity_class:
connectivity_class = _choose_connectivity_class(hostname, args['port'])
# TODO(kevcheng): get rid of the host detection using host attributes.
host_class = (host_class
or OS_HOST_DICT.get(afe_host.attributes.get('os_type'))
or OS_HOST_DICT.get(host_os)
or _detect_host(connectivity_class, hostname, **args))
# create a custom host class for this machine and return an instance of it
classes = (host_class, connectivity_class)
custom_host_class = type("%s_host" % hostname, classes, {})
host_instance = custom_host_class(hostname, **args)
# call job_start if this is the first time this host is being used
if hostname not in _started_hostnames:
host_instance.job_start()
_started_hostnames.add(hostname)
return host_instance
def create_testbed(machine, **kwargs):
"""Create the testbed object.
@param machine: A dict representing the test bed under test or a String
representing the testbed hostname (for legacy caller
support).
If it is a machine dict, the 'hostname' key is required.
Optional 'afe_host' key will pipe in afe_host from
the afe_host object from the autoserv runtime or the AFE.
@param kwargs: Keyword args to pass to the testbed initialization.
@returns: The testbed object with all associated host objects instantiated.
"""
detected_args = _get_host_arguments(machine)
hostname = detected_args.pop('hostname')
kwargs.update(detected_args)
return testbed.TestBed(hostname, **kwargs)
def create_target_machine(machine, **kwargs):
"""Create the target machine which could be a testbed or a *Host.
@param machine: A dict representing the test bed under test or a String
representing the testbed hostname (for legacy caller
support).
If it is a machine dict, the 'hostname' key is required.
Optional 'afe_host' key will pipe in afe_host
from the autoserv runtime or the AFE.
@param kwargs: Keyword args to pass to the testbed initialization.
@returns: The target machine to be used for verify/repair.
"""
# For Brillo/Android devices connected to moblab, the `machine` name is
# either `localhost` or `127.0.0.1`. It needs to be translated to the host
# container IP if the code is running inside a container. This way, autoserv
# can ssh to the moblab and run actual adb/fastboot commands.
is_moblab = CONFIG.get_config_value('SSP', 'is_moblab', type=bool,
default=False)
hostname = machine['hostname'] if isinstance(machine, dict) else machine
if (utils.is_in_container() and is_moblab and
hostname in ['localhost', '127.0.0.1']):
hostname = CONFIG.get_config_value('SSP', 'host_container_ip', type=str,
default=None)
if isinstance(machine, dict):
machine['hostname'] = hostname
else:
machine = hostname
logging.debug('Hostname of machine is converted to %s for the test to '
'run inside a container.', hostname)
# TODO(kevcheng): We'll want to have a smarter way of figuring out which
# host to create (checking host labels).
if server_utils.machine_is_testbed(machine):
return create_testbed(machine, **kwargs)
return create_host(machine, **kwargs)