def __init__(self,
pool_connections=DEFAULT_POOLSIZE,
pool_maxsize=DEFAULT_POOLSIZE,
max_retries=DEFAULT_RETRIES,
pool_block=DEFAULT_POOLBLOCK):
if max_retries == DEFAULT_RETRIES:
self.max_retries = Retry(0, read=False)
else:
self.max_retries = Retry.from_int(max_retries)
self.config = {}
self.proxy_manager = {}
super(HTTPAdapter, self).__init__()
self._pool_connections = pool_connections
self._pool_maxsize = pool_maxsize
self._pool_block = pool_block
self.init_poolmanager(pool_connections, pool_maxsize, block=pool_block)
def _set_region_from_instance_metadata_service(region):
# Check if region information from IMDS has already been read
if _get_source_has_been_read(ExternalSources.IMDS):
# Return False to allow fallback
return False
# Set source as read
_set_source_has_been_read(ExternalSources.IMDS)
try:
retry_strategy = Retry(total=3,
status_forcelist=[429, 500, 502, 503, 504],
read=0,
connect=3,
status=3)
s = requests.Session()
s.mount(GET_REGION_URL, HTTPAdapter(max_retries=retry_strategy))
response = s.get(GET_REGION_URL,
timeout=(10, 60),
headers=METADATA_AUTH_HEADERS)
region_metadata_raw = response.text
logger.debug("Region metadata blob from IMDS is: {}".format(
region_metadata_raw))
except (HTTPError, ConnectionError, RetryError) as e:
logger.debug(
"Failed to call IMDS service because of error: {}".format(e))
return False
if response.status_code != 200:
logger.debug(
"HTTP Get Failed: URL: {}, Status: {}, Message: {}".format(
GET_REGION_URL, response.status_code, response.text))
return False
try:
from json.decoder import JSONDecodeError
except ImportError:
JSONDecodeError = ValueError
try:
region_metadata = json.loads(region_metadata_raw)
except JSONDecodeError as e:
# Unable to parse the raw response
logger.debug(
"Decoding JSON from IMDS service because of error: {}".format(e))
return False
if _check_valid_schema(region_metadata):
return _add_region_information_to_lookup(region_metadata, region)
return False