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# Windows Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#
import os
import traceback
import threading
import azurelinuxagent.logger as logger
from azurelinuxagent.future import text
import azurelinuxagent.utils.fileutil as fileutil
from azurelinuxagent.utils.osutil import OSUTIL
from azurelinuxagent.protocol.common import *
from azurelinuxagent.protocol.v1 import WireProtocol
from azurelinuxagent.protocol.v2 import MetadataProtocol
WIRE_SERVER_ADDR_FILE_NAME = "WireServer"
def get_wire_protocol_endpoint():
path = os.path.join(OSUTIL.get_lib_dir(), WIRE_SERVER_ADDR_FILE_NAME)
try:
endpoint = fileutil.read_file(path)
except IOError as e:
raise ProtocolNotFound("Wire server endpoint not found: {0}".format(e))
if endpoint is None:
raise ProtocolNotFound("Wire server endpoint is None")
return endpoint
def detect_wire_protocol():
endpoint = get_wire_protocol_endpoint()
OSUTIL.gen_transport_cert()
protocol = WireProtocol(endpoint)
protocol.initialize()
logger.info("Protocol V1 found.")
return protocol
def detect_metadata_protocol():
protocol = MetadataProtocol()
protocol.initialize()
logger.info("Protocol V2 found.")
return protocol
def detect_available_protocols(prob_funcs=[detect_wire_protocol,
detect_metadata_protocol]):
available_protocols = []
for probe_func in prob_funcs:
try:
protocol = probe_func()
available_protocols.append(protocol)
except ProtocolNotFound as e:
logger.info(text(e))
return available_protocols
def detect_default_protocol():
logger.info("Detect default protocol.")
available_protocols = detect_available_protocols()
return choose_default_protocol(available_protocols)
def choose_default_protocol(protocols):
if len(protocols) > 0:
return protocols[0]
else:
raise ProtocolNotFound("No available protocol detected.")
def get_wire_protocol():
endpoint = get_wire_protocol_endpoint()
return WireProtocol(endpoint)
def get_metadata_protocol():
return MetadataProtocol()
def get_available_protocols(getters=[get_wire_protocol, get_metadata_protocol]):
available_protocols = []
for getter in getters:
try:
protocol = getter()
available_protocols.append(protocol)
except ProtocolNotFound as e:
logger.info(text(e))
return available_protocols
class ProtocolFactory(object):
def __init__(self):
self._protocol = None
self._lock = threading.Lock()
def get_default_protocol(self):
if self._protocol is None:
self._lock.acquire()
if self._protocol is None:
available_protocols = get_available_protocols()
self._protocol = choose_default_protocol(available_protocols)
self._lock.release()
return self._protocol
FACTORY = ProtocolFactory()
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