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from __future__ import absolute_import
import abc
from email.message import Message
try:
from email import message_from_bytes as message_parser
except ImportError: # 2.7
from email import message_from_string as message_parser # type: ignore
from io import BytesIO
import json
import logging
import os
import time
import copy
try:
binary_type = str
from urlparse import urlparse # type: ignore
except ImportError:
binary_type = bytes # type: ignore
from urllib.parse import urlparse
import xml.etree.ElementTree as ET
from typing import (
TYPE_CHECKING,
Generic,
TypeVar,
cast,
IO,
List,
Union,
Any,
Mapping,
Dict,
Optional,
Tuple,
Iterator,
Type
)
from six.moves.http_client import HTTPConnection, HTTPResponse as _HTTPResponse
from azure.core.pipeline import (
ABC,
AbstractContextManager,
PipelineRequest,
PipelineResponse,
PipelineContext,
)
from .._tools import await_result as _await_result
if TYPE_CHECKING:
from ..policies import SansIOHTTPPolicy
from collections.abc import MutableMapping
HTTPResponseType = TypeVar("HTTPResponseType")
HTTPRequestType = TypeVar("HTTPRequestType")
PipelineType = TypeVar("PipelineType")
_LOGGER = logging.getLogger(__name__)
def _case_insensitive_dict(*args, **kwargs):
"""Return a case-insensitive dict from a structure that a dict would have accepted.
Rational is I don't want to re-implement this, but I don't want
to assume "requests" or "aiohttp" are installed either.
So I use the one from "requests" or the one from "aiohttp" ("multidict")
If one day this library is used in an HTTP context without "requests" nor "aiohttp" installed,
we can add "multidict" as a dependency or re-implement our own.
"""
try:
from requests.structures import CaseInsensitiveDict
return CaseInsensitiveDict(*args, **kwargs)
except ImportError:
pass
try:
# multidict is installed by aiohttp
from multidict import CIMultiDict
return CIMultiDict(*args, **kwargs)
except ImportError:
raise ValueError(
"Neither 'requests' or 'multidict' are installed and no case-insensitive dict impl have been found"
)
def _format_url_section(template, **kwargs):
"""String format the template with the kwargs, auto-skip sections of the template that are NOT in the kwargs.
By default in Python, "format" will raise a KeyError if a template element is not found. Here the section between
the slashes will be removed from the template instead.
This is used for API like Storage, where when Swagger has template section not defined as parameter.
:param str template: a string template to fill
:param dict[str,str] kwargs: Template values as string
:rtype: str
:returns: Template completed
"""
components = template.split("/")
while components:
try:
return template.format(**kwargs)
except KeyError as key:
formatted_components = template.split("/")
components = [
c for c in formatted_components if "{{{}}}".format(key.args[0]) not in c
]
template = "/".join(components)
# No URL sections left - returning None
def _urljoin(base_url, stub_url):
# type: (str, str) -> str
"""Append to end of base URL without losing query parameters.
:param str base_url: The base URL.
:param str stub_url: Section to append to the end of the URL path.
:returns: The updated URL.
:rtype: str
"""
parsed = urlparse(base_url)
parsed = parsed._replace(path=parsed.path.rstrip("/") + "/" + stub_url)
return parsed.geturl()
class _HTTPSerializer(HTTPConnection, object):
"""Hacking the stdlib HTTPConnection to serialize HTTP request as strings.
"""
def __init__(self, *args, **kwargs):
self.buffer = b""
kwargs.setdefault("host", "fakehost")
super(_HTTPSerializer, self).__init__(*args, **kwargs)
def putheader(self, header, *values):
if header in ["Host", "Accept-Encoding"]:
return
super(_HTTPSerializer, self).putheader(header, *values)
def send(self, data):
self.buffer += data
def _serialize_request(http_request):
serializer = _HTTPSerializer()
serializer.request(
method=http_request.method,
url=http_request.url,
body=http_request.body,
headers=http_request.headers,
)
return serializer.buffer
[docs]class HttpTransport(
AbstractContextManager, ABC, Generic[HTTPRequestType, HTTPResponseType]
): # type: ignore
"""An http sender ABC.
"""
[docs] @abc.abstractmethod
def send(self, request, **kwargs):
# type: (HTTPRequestType, Any) -> HTTPResponseType
"""Send the request using this HTTP sender.
:param request: The pipeline request object
:type request: ~azure.core.transport.HTTPRequest
:return: The pipeline response object.
:rtype: ~azure.core.pipeline.transport.HttpResponse
"""
[docs] @abc.abstractmethod
def open(self):
"""Assign new session if one does not already exist."""
[docs] @abc.abstractmethod
def close(self):
"""Close the session if it is not externally owned."""
[docs] def sleep(self, duration): # pylint: disable=no-self-use
time.sleep(duration)
[docs]class HttpRequest(object):
"""Represents a HTTP request.
URL can be given without query parameters, to be added later using "format_parameters".
:param str method: HTTP method (GET, HEAD, etc.)
:param str url: At least complete scheme/host/path
:param dict[str,str] headers: HTTP headers
:param files: Files list.
:param data: Body to be sent.
:type data: bytes or str.
"""
def __init__(self, method, url, headers=None, files=None, data=None):
# type: (str, str, Mapping[str, str], Any, Any) -> None
self.method = method
self.url = url
self.headers = _case_insensitive_dict(headers)
self.files = files
self.data = data
self.multipart_mixed_info = None # type: Optional[Tuple]
def __repr__(self):
return "<HttpRequest [%s]>" % (self.method)
def __deepcopy__(self, memo=None):
try:
data = copy.deepcopy(self.body, memo)
files = copy.deepcopy(self.files, memo)
return HttpRequest(self.method, self.url, self.headers, files, data)
except (ValueError, TypeError):
return copy.copy(self)
@property
def query(self):
"""The query parameters of the request as a dict.
:rtype: dict[str, str]
"""
query = urlparse(self.url).query
if query:
return {p[0]: p[-1] for p in [p.partition("=") for p in query.split("&")]}
return {}
@property
def body(self):
"""Alias to data.
:rtype: bytes
"""
return self.data
@body.setter
def body(self, value):
self.data = value
@staticmethod
def _format_data(data):
# type: (Union[str, IO]) -> Union[Tuple[None, str], Tuple[Optional[str], IO, str]]
"""Format field data according to whether it is a stream or
a string for a form-data request.
:param data: The request field data.
:type data: str or file-like object.
"""
if hasattr(data, "read"):
data = cast(IO, data)
data_name = None
try:
if data.name[0] != "<" and data.name[-1] != ">":
data_name = os.path.basename(data.name)
except (AttributeError, TypeError):
pass
return (data_name, data, "application/octet-stream")
return (None, cast(str, data))
[docs] def set_streamed_data_body(self, data):
"""Set a streamable data body.
:param data: The request field data.
:type data: stream or generator or asyncgenerator
"""
if not isinstance(data, binary_type) and not any(
hasattr(data, attr) for attr in ["read", "__iter__", "__aiter__"]
):
raise TypeError(
"A streamable data source must be an open file-like object or iterable."
)
self.data = data
self.files = None
[docs] def set_text_body(self, data):
"""Set a text as body of the request.
:param data: A text to send as body.
:type data: str
"""
if data is None:
self.data = None
else:
self.data = data
self.headers["Content-Length"] = str(len(self.data))
self.files = None
[docs] def set_xml_body(self, data):
"""Set an XML element tree as the body of the request.
:param data: The request field data.
:type data: XML node
"""
if data is None:
self.data = None
else:
bytes_data = ET.tostring(data, encoding="utf8")
self.data = bytes_data.replace(b"encoding='utf8'", b"encoding='utf-8'")
self.headers["Content-Length"] = str(len(self.data))
self.files = None
[docs] def set_json_body(self, data):
"""Set a JSON-friendly object as the body of the request.
:param data: A JSON serializable object
"""
if data is None:
self.data = None
else:
self.data = json.dumps(data)
self.headers["Content-Length"] = str(len(self.data))
self.files = None
[docs] def set_formdata_body(self, data=None):
"""Set form-encoded data as the body of the request.
:param data: The request field data.
:type data: dict
"""
if data is None:
data = {}
content_type = self.headers.pop("Content-Type", None) if self.headers else None
if content_type and content_type.lower() == "application/x-www-form-urlencoded":
self.data = {f: d for f, d in data.items() if d is not None}
self.files = None
else: # Assume "multipart/form-data"
self.files = {
f: self._format_data(d) for f, d in data.items() if d is not None
}
self.data = None
[docs] def set_bytes_body(self, data):
"""Set generic bytes as the body of the request.
Will set content-length.
:param data: The request field data.
:type data: bytes
"""
if data:
self.headers["Content-Length"] = str(len(data))
self.data = data
self.files = None
[docs] def set_multipart_mixed(self, *requests, **kwargs):
# type: (HttpRequest, Any) -> None
"""Set the part of a multipart/mixed.
Only supported args for now are HttpRequest objects.
boundary is optional, and one will be generated if you don't provide one.
Note that no verification are made on the boundary, this is considered advanced
enough so you know how to respect RFC1341 7.2.1 and provide a correct boundary.
Any additional kwargs will be passed into the pipeline context for per-request policy
configuration.
:keyword list[SansIOHTTPPolicy] policies: SansIOPolicy to apply at preparation time
:keyword str boundary: Optional boundary
:param requests: HttpRequests object
"""
self.multipart_mixed_info = (
requests,
kwargs.pop("policies", []),
kwargs.pop("boundary", None),
kwargs
)
[docs] def prepare_multipart_body(self, content_index=0):
# type: (int) -> int
"""Will prepare the body of this request according to the multipart information.
This call assumes the on_request policies have been applied already in their
correct context (sync/async)
Does nothing if "set_multipart_mixed" was never called.
:param int content_index: The current index of parts within the batch message.
:returns: The updated index after all parts in this request have been added.
:rtype: int
"""
if not self.multipart_mixed_info:
return 0
requests = self.multipart_mixed_info[0] # type: List[HttpRequest]
boundary = self.multipart_mixed_info[2] # type: Optional[str]
# Update the main request with the body
main_message = Message()
main_message.add_header("Content-Type", "multipart/mixed")
if boundary:
main_message.set_boundary(boundary)
for req in requests:
part_message = Message()
if req.multipart_mixed_info:
content_index = req.prepare_multipart_body(content_index=content_index)
part_message.add_header("Content-Type", req.headers['Content-Type'])
payload = req.serialize()
# We need to remove the ~HTTP/1.1 prefix along with the added content-length
payload = payload[payload.index(b'--'):]
else:
part_message.add_header("Content-Type", "application/http")
part_message.add_header("Content-Transfer-Encoding", "binary")
part_message.add_header("Content-ID", str(content_index))
payload = req.serialize()
content_index += 1
part_message.set_payload(payload)
main_message.attach(part_message)
try:
from email.policy import HTTP
full_message = main_message.as_bytes(policy=HTTP)
eol = b"\r\n"
except ImportError: # Python 2.7
# Right now we decide to not support Python 2.7 on serialization, since
# it doesn't serialize a valid HTTP request (and our main scenario Storage refuses it)
raise NotImplementedError(
"Multipart request are not supported on Python 2.7"
)
# full_message = main_message.as_string()
# eol = b'\n'
_, _, body = full_message.split(eol, 2)
self.set_bytes_body(body)
self.headers["Content-Type"] = (
"multipart/mixed; boundary=" + main_message.get_boundary()
)
return content_index
[docs] def serialize(self):
# type: () -> bytes
"""Serialize this request using application/http spec.
:rtype: bytes
"""
return _serialize_request(self)
class _HttpResponseBase(object):
"""Represent a HTTP response.
No body is defined here on purpose, since async pipeline
will provide async ways to access the body
Full in-memory using "body" as bytes.
:param request: The request.
:type request: ~azure.core.pipeline.transport.HttpRequest
:param internal_response: The object returned from the HTTP library.
:param int block_size: Defaults to 4096 bytes.
"""
def __init__(self, request, internal_response, block_size=None):
# type: (HttpRequest, Any, Optional[int]) -> None
self.request = request
self.internal_response = internal_response
self.status_code = None # type: Optional[int]
self.headers = {} # type: MutableMapping[str, str]
self.reason = None # type: Optional[str]
self.content_type = None # type: Optional[str]
self.block_size = block_size or 4096 # Default to same as Requests
def body(self):
# type: () -> bytes
"""Return the whole body as bytes in memory.
"""
raise NotImplementedError()
def text(self, encoding=None):
# type: (str) -> str
"""Return the whole body as a string.
:param str encoding: The encoding to apply. If None, use "utf-8" with BOM parsing (utf-8-sig).
Implementation can be smarter if they want (using headers or chardet).
"""
if encoding == "utf-8" or encoding is None:
encoding = "utf-8-sig"
return self.body().decode(encoding)
def _decode_parts(self, message, http_response_type, requests):
# type: (Message, Type[_HttpResponseBase], List[HttpRequest]) -> List[HttpResponse]
"""Rebuild an HTTP response from pure string."""
responses = []
for index, raw_reponse in enumerate(message.get_payload()):
content_type = raw_reponse.get_content_type()
if content_type == "application/http":
responses.append(
_deserialize_response(
raw_reponse.get_payload(decode=True),
requests[index],
http_response_type=http_response_type,
)
)
elif content_type == "multipart/mixed" and requests[index].multipart_mixed_info:
# The message batch contains one or more change sets
changeset_requests = requests[index].multipart_mixed_info[0] # type: ignore
changeset_responses = self._decode_parts(raw_reponse, http_response_type, changeset_requests)
responses.extend(changeset_responses)
else:
raise ValueError(
"Multipart doesn't support part other than application/http for now"
)
return responses
def _get_raw_parts(self, http_response_type=None):
# type (Optional[Type[_HttpResponseBase]]) -> Iterator[HttpResponse]
"""Assuming this body is multipart, return the iterator or parts.
If parts are application/http use http_response_type or HttpClientTransportResponse
as enveloppe.
"""
if http_response_type is None:
http_response_type = HttpClientTransportResponse
body_as_bytes = self.body()
# In order to use email.message parser, I need full HTTP bytes. Faking something to make the parser happy
http_body = (
b"Content-Type: "
+ self.content_type.encode("ascii")
+ b"\r\n\r\n"
+ body_as_bytes
)
message = message_parser(http_body) # type: Message
requests = self.request.multipart_mixed_info[0] # type: List[HttpRequest]
return self._decode_parts(message, http_response_type, requests)
[docs]class HttpResponse(_HttpResponseBase): # pylint: disable=abstract-method
[docs] def stream_download(self, pipeline):
# type: (PipelineType) -> Iterator[bytes]
"""Generator for streaming request body data.
Should be implemented by sub-classes if streaming download
is supported.
:rtype: iterator[bytes]
"""
[docs] def parts(self):
# type: () -> Iterator[HttpResponse]
"""Assuming the content-type is multipart/mixed, will return the parts as an iterator.
:rtype: iterator[HttpResponse]
:raises ValueError: If the content is not multipart/mixed
"""
if not self.content_type or not self.content_type.startswith("multipart/mixed"):
raise ValueError(
"You can't get parts if the response is not multipart/mixed"
)
responses = self._get_raw_parts()
if self.request.multipart_mixed_info:
policies = self.request.multipart_mixed_info[1] # type: List[SansIOHTTPPolicy]
# Apply on_response concurrently to all requests
import concurrent.futures
def parse_responses(response):
http_request = response.request
context = PipelineContext(None)
pipeline_request = PipelineRequest(http_request, context)
pipeline_response = PipelineResponse(
http_request, response, context=context
)
for policy in policies:
_await_result(policy.on_response, pipeline_request, pipeline_response)
with concurrent.futures.ThreadPoolExecutor() as executor:
# List comprehension to raise exceptions if happened
[ # pylint: disable=expression-not-assigned, unnecessary-comprehension
_ for _ in executor.map(parse_responses, responses)
]
return responses
class _HttpClientTransportResponse(_HttpResponseBase):
"""Create a HTTPResponse from an http.client response.
Body will NOT be read by the constructor. Call "body()" to load the body in memory if necessary.
:param HttpRequest request: The request.
:param httpclient_response: The object returned from an HTTP(S)Connection from http.client
"""
def __init__(self, request, httpclient_response):
super(_HttpClientTransportResponse, self).__init__(request, httpclient_response)
self.status_code = httpclient_response.status
self.headers = _case_insensitive_dict(httpclient_response.getheaders())
self.reason = httpclient_response.reason
self.content_type = self.headers.get("Content-Type")
self.data = None
def body(self):
if self.data is None:
self.data = self.internal_response.read()
return self.data
class HttpClientTransportResponse(_HttpClientTransportResponse, HttpResponse):
"""Create a HTTPResponse from an http.client response.
Body will NOT be read by the constructor. Call "body()" to load the body in memory if necessary.
"""
class BytesIOSocket(object):
"""Mocking the "makefile" of socket for HTTPResponse.
This can be used to create a http.client.HTTPResponse object
based on bytes and not a real socket.
"""
def __init__(self, bytes_data):
self.bytes_data = bytes_data
def makefile(self, *_):
return BytesIO(self.bytes_data)
def _deserialize_response(
http_response_as_bytes, http_request, http_response_type=HttpClientTransportResponse
):
local_socket = BytesIOSocket(http_response_as_bytes)
response = _HTTPResponse(local_socket, method=http_request.method)
response.begin()
return http_response_type(http_request, response)
class PipelineClientBase(object):
"""Base class for pipeline clients.
:param str base_url: URL for the request.
"""
def __init__(self, base_url):
self._base_url = base_url
def _request(
self,
method, # type: str
url, # type: str
params, # type: Optional[Dict[str, str]]
headers, # type: Optional[Dict[str, str]]
content, # type: Any
form_content, # type: Optional[Dict[str, Any]]
stream_content, # type: Any
):
# type: (...) -> HttpRequest
"""Create HttpRequest object.
If content is not None, guesses will be used to set the right body:
- If content is an XML tree, will serialize as XML
- If content-type starts by "text/", set the content as text
- Else, try JSON serialization
:param str method: HTTP method (GET, HEAD, etc.)
:param str url: URL for the request.
:param dict params: URL query parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = HttpRequest(method, self.format_url(url))
if params:
request.format_parameters(params)
if headers:
request.headers.update(headers)
if content is not None:
content_type = request.headers.get("Content-Type")
if isinstance(content, ET.Element):
request.set_xml_body(content)
# https://github.com/Azure/azure-sdk-for-python/issues/12137
# A string is valid JSON, make the difference between text
# and a plain JSON string.
# Content-Type is a good indicator of intent from user
elif content_type and content_type.startswith("text/"):
request.set_text_body(content)
else:
try:
request.set_json_body(content)
except TypeError:
request.data = content
if form_content:
request.set_formdata_body(form_content)
elif stream_content:
request.set_streamed_data_body(stream_content)
return request
def format_url(self, url_template, **kwargs):
# type: (str, Any) -> str
"""Format request URL with the client base URL, unless the
supplied URL is already absolute.
:param str url_template: The request URL to be formatted if necessary.
"""
url = _format_url_section(url_template, **kwargs)
if url:
parsed = urlparse(url)
if not parsed.scheme or not parsed.netloc:
url = url.lstrip("/")
try:
base = self._base_url.format(**kwargs).rstrip("/")
except KeyError as key:
err_msg = "The value provided for the url part {} was incorrect, and resulted in an invalid url"
raise ValueError(err_msg.format(key.args[0]))
url = _urljoin(base, url)
else:
url = self._base_url.format(**kwargs)
return url
def get(
self,
url, # type: str
params=None, # type: Optional[Dict[str, str]]
headers=None, # type: Optional[Dict[str, str]]
content=None, # type: Any
form_content=None, # type: Optional[Dict[str, Any]]
):
# type: (...) -> HttpRequest
"""Create a GET request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"GET", url, params, headers, content, form_content, None
)
request.method = "GET"
return request
def put(
self,
url, # type: str
params=None, # type: Optional[Dict[str, str]]
headers=None, # type: Optional[Dict[str, str]]
content=None, # type: Any
form_content=None, # type: Optional[Dict[str, Any]]
stream_content=None, # type: Any
):
# type: (...) -> HttpRequest
"""Create a PUT request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"PUT", url, params, headers, content, form_content, stream_content
)
return request
def post(
self,
url, # type: str
params=None, # type: Optional[Dict[str, str]]
headers=None, # type: Optional[Dict[str, str]]
content=None, # type: Any
form_content=None, # type: Optional[Dict[str, Any]]
stream_content=None, # type: Any
):
# type: (...) -> HttpRequest
"""Create a POST request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"POST", url, params, headers, content, form_content, stream_content
)
return request
def head(
self,
url, # type: str
params=None, # type: Optional[Dict[str, str]]
headers=None, # type: Optional[Dict[str, str]]
content=None, # type: Any
form_content=None, # type: Optional[Dict[str, Any]]
stream_content=None, # type: Any
):
# type: (...) -> HttpRequest
"""Create a HEAD request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"HEAD", url, params, headers, content, form_content, stream_content
)
return request
def patch(
self,
url, # type: str
params=None, # type: Optional[Dict[str, str]]
headers=None, # type: Optional[Dict[str, str]]
content=None, # type: Any
form_content=None, # type: Optional[Dict[str, Any]]
stream_content=None, # type: Any
):
# type: (...) -> HttpRequest
"""Create a PATCH request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"PATCH", url, params, headers, content, form_content, stream_content
)
return request
def delete(self, url, params=None, headers=None, content=None, form_content=None):
# type: (str, Optional[Dict[str, str]], Optional[Dict[str, str]], Any, Optional[Dict[str, Any]]) -> HttpRequest
"""Create a DELETE request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"DELETE", url, params, headers, content, form_content, None
)
return request
def merge(self, url, params=None, headers=None, content=None, form_content=None):
# type: (str, Optional[Dict[str, str]], Optional[Dict[str, str]], Any, Optional[Dict[str, Any]]) -> HttpRequest
"""Create a MERGE request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:param content: The body content
:param dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
request = self._request(
"MERGE", url, params, headers, content, form_content, None
)
return request
def options(self, url, params=None, headers=None, **kwargs):
# type: (str, Optional[Dict[str, str]], Optional[Dict[str, str]], Any) -> HttpRequest
"""Create a OPTIONS request object.
:param str url: The request URL.
:param dict params: Request URL parameters.
:param dict headers: Headers
:keyword content: The body content
:keyword dict form_content: Form content
:return: An HttpRequest object
:rtype: ~azure.core.pipeline.transport.HttpRequest
"""
content = kwargs.get("content")
form_content = kwargs.get("form_content")
request = self._request(
"OPTIONS", url, params, headers, content, form_content, None
)
return request