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# coding: utf-8
{{>partial_header}}
import io
import json
import re
import ssl
from typing import Optional, Union
import aiohttp
import aiohttp_retry
from {{packageName}}.exceptions import ApiException, ApiValueError
RESTResponseType = aiohttp.ClientResponse
ALLOW_RETRY_METHODS = frozenset({'DELETE', 'GET', 'HEAD', 'OPTIONS', 'PUT', 'TRACE'})
class RESTResponse(io.IOBase):
def __init__(self, resp) -> None:
self.response = resp
self.status = resp.status
self.reason = resp.reason
self.data = None
async def read(self):
if self.data is None:
self.data = await self.response.read()
return self.data
def getheaders(self):
"""Returns a CIMultiDictProxy of the response headers."""
return self.response.headers
def getheader(self, name, default=None):
"""Returns a given response header."""
return self.response.headers.get(name, default)
class RESTClientObject:
def __init__(self, configuration) -> None:
# maxsize is number of requests to host that are allowed in parallel
maxsize = configuration.connection_pool_maxsize
ssl_context = ssl.create_default_context(
cafile=configuration.ssl_ca_cert
)
if configuration.cert_file:
ssl_context.load_cert_chain(
configuration.cert_file, keyfile=configuration.key_file
)
if not configuration.verify_ssl:
ssl_context.check_hostname = False
ssl_context.verify_mode = ssl.CERT_NONE
connector = aiohttp.TCPConnector(
limit=maxsize,
ssl=ssl_context
)
self.proxy = configuration.proxy
self.proxy_headers = configuration.proxy_headers
# https pool manager
self.pool_manager = aiohttp.ClientSession(
connector=connector,
trust_env=True
)
retries = configuration.retries
self.retry_client: Optional[aiohttp_retry.RetryClient]
if retries is not None:
self.retry_client = aiohttp_retry.RetryClient(
client_session=self.pool_manager,
retry_options=aiohttp_retry.ExponentialRetry(
attempts=retries,
factor=0.0,
start_timeout=0.0,
max_timeout=120.0
)
)
else:
self.retry_client = None
async def close(self):
await self.pool_manager.close()
if self.retry_client is not None:
await self.retry_client.close()
async def request(
self,
method,
url,
headers=None,
body=None,
post_params=None,
_request_timeout=None
):
"""Execute request
:param method: http request method
:param url: http request url
:param headers: http request headers
:param body: request json body, for `application/json`
:param post_params: request post parameters,
`application/x-www-form-urlencoded`
and `multipart/form-data`
:param _request_timeout: timeout setting for this request. If one
number provided, it will be total request
timeout. It can also be a pair (tuple) of
(connection, read) timeouts.
"""
method = method.upper()
assert method in [
'GET',
'HEAD',
'DELETE',
'POST',
'PUT',
'PATCH',
'OPTIONS'
]
if post_params and body:
raise ApiValueError(
"body parameter cannot be used with post_params parameter."
)
post_params = post_params or {}
headers = headers or {}
# url already contains the URL query string
timeout = _request_timeout or 5 * 60
if 'Content-Type' not in headers:
headers['Content-Type'] = 'application/json'
args = {
"method": method,
"url": url,
"timeout": timeout,
"headers": headers
}
if self.proxy:
args["proxy"] = self.proxy
if self.proxy_headers:
args["proxy_headers"] = self.proxy_headers
# For `POST`, `PUT`, `PATCH`, `OPTIONS`, `DELETE`
if method in ['POST', 'PUT', 'PATCH', 'OPTIONS', 'DELETE']:
if re.search('json', headers['Content-Type'], re.IGNORECASE):
if body is not None:
body = json.dumps(body)
args["data"] = body
elif headers['Content-Type'] == 'application/x-www-form-urlencoded':
args["data"] = aiohttp.FormData(post_params)
elif headers['Content-Type'] == 'multipart/form-data':
# must del headers['Content-Type'], or the correct
# Content-Type which generated by aiohttp
del headers['Content-Type']
data = aiohttp.FormData()
for param in post_params:
k, v = param
if isinstance(v, tuple) and len(v) == 3:
data.add_field(
k,
value=v[1],
filename=v[0],
content_type=v[2]
)
else:
data.add_field(k, v)
args["data"] = data
# Pass a `bytes` parameter directly in the body to support
# other content types than Json when `body` argument is provided
# in serialized form
elif isinstance(body, bytes):
args["data"] = body
else:
# Cannot generate the request from given parameters
msg = """Cannot prepare a request message for provided
arguments. Please check that your arguments match
declared content type."""
raise ApiException(status=0, reason=msg)
pool_manager: Union[aiohttp.ClientSession, aiohttp_retry.RetryClient]
if self.retry_client is not None and method in ALLOW_RETRY_METHODS:
pool_manager = self.retry_client
else:
pool_manager = self.pool_manager
r = await pool_manager.request(**args)
return RESTResponse(r)
