def _detect_protocol(self, protocols):
"""
Probe protocol endpoints in turn.
"""
self.clear_protocol()
for retry in range(0, MAX_RETRY):
for protocol_name in protocols:
try:
protocol = self._detect_wire_protocol() \
if protocol_name == "WireProtocol" \
else self._detect_metadata_protocol()
IOErrorCounter.set_protocol_endpoint(
endpoint=protocol.endpoint)
return protocol
except ProtocolError as e:
logger.info("Protocol endpoint not found: {0}, {1}",
protocol_name, e)
if retry < MAX_RETRY - 1:
logger.info("Retry detect protocols: retry={0}", retry)
time.sleep(PROBE_INTERVAL)
raise ProtocolNotFoundError("No protocol found.")
def _get_protocol(self):
"""
Get protocol instance based on previous detecting result.
"""
protocol_file_path = self._get_protocol_file_path()
if not os.path.isfile(protocol_file_path):
raise ProtocolNotFoundError("No protocol found")
protocol_name = fileutil.read_file(protocol_file_path)
if protocol_name == prots.WireProtocol:
endpoint = self._get_wireserver_endpoint()
return WireProtocol(endpoint)
elif protocol_name == prots.MetadataProtocol:
return MetadataProtocol()
else:
raise ProtocolNotFoundError(("Unknown protocol: {0}"
"").format(protocol_name))
def _get_protocol(self):
"""
Get protocol instance based on previous detecting result.
"""
protocol_file_path = os.path.join(conf.get_lib_dir(),
PROTOCOL_FILE_NAME)
if not os.path.isfile(protocol_file_path):
raise ProtocolNotFoundError("No protocol found")
protocol_name = fileutil.read_file(protocol_file_path)
if protocol_name == "WireProtocol":
endpoint = self._get_wireserver_endpoint()
return WireProtocol(endpoint)
elif protocol_name == "MetadataProtocol":
return MetadataProtocol()
else:
raise ProtocolNotFoundError(("Unknown protocol: {0}"
"").format(protocol_name))
def _detect_protocol(self):
"""
Probe protocol endpoints in turn.
"""
self.clear_protocol()
for retry in range(0, MAX_RETRY):
try:
endpoint = self.dhcp_handler.endpoint
if endpoint is None:
# pylint: disable=W0105
'''
Check if DHCP can be used to get the wire protocol endpoint
'''
# pylint: enable=W0105
dhcp_available = self.osutil.is_dhcp_available()
if dhcp_available:
logger.info(
"WireServer endpoint is not found. Rerun dhcp handler"
)
try:
self.dhcp_handler.run()
except DhcpError as e:
raise ProtocolError(ustr(e))
endpoint = self.dhcp_handler.endpoint
else:
logger.info("_detect_protocol: DHCP not available")
endpoint = self.get_wireserver_endpoint()
try:
protocol = WireProtocol(endpoint)
protocol.detect()
self._set_wireserver_endpoint(endpoint)
return protocol
except ProtocolError as e:
logger.info(
"WireServer is not responding. Reset dhcp endpoint")
self.dhcp_handler.endpoint = None
self.dhcp_handler.skip_cache = True
raise e
except ProtocolError as e:
logger.info("Protocol endpoint not found: {0}", e)
if retry < MAX_RETRY - 1:
logger.info("Retry detect protocol: retry={0}", retry)
time.sleep(PROBE_INTERVAL)
raise ProtocolNotFoundError("No protocol found.")
def check_wire_protocol_version(self):
uri = VERSION_INFO_URI.format(self.endpoint)
version_info_xml = self.fetch_config(uri, None)
version_info = VersionInfo(version_info_xml)
preferred = version_info.get_preferred()
if PROTOCOL_VERSION == preferred:
logger.info("Wire protocol version:{0}", PROTOCOL_VERSION)
elif PROTOCOL_VERSION in version_info.get_supported():
logger.info("Wire protocol version:{0}", PROTOCOL_VERSION)
logger.warn("Server prefered version:{0}", preferred)
else:
error = ("Agent supported wire protocol version: {0} was not "
"advised by Fabric.").format(PROTOCOL_VERSION)
raise ProtocolNotFoundError(error)
def _detect_protocol(self, protocols):
"""
Probe protocol endpoints in turn.
"""
self.clear_protocol()
for retry in range(0, MAX_RETRY):
for protocol in protocols:
try:
if protocol == "WireProtocol":
return self._detect_wire_protocol()
if protocol == "MetadataProtocol":
return self._detect_metadata_protocol()
except ProtocolError as e:
logger.info("Protocol endpoint not found: {0}, {1}",
protocol, e)
if retry < MAX_RETRY - 1:
logger.info("Retry detect protocols: retry={0}", retry)
time.sleep(PROBE_INTERVAL)
raise ProtocolNotFoundError("No protocol found.")
