Feat/middleware pipeline

[jobala]

Overview

Adds a middleware pipeline.
Enforces TLS 1.2

Notes

The middleware pipeline is a linkedlist with middlewares as nodes. The middlewares inherit from HTTPAdapter.

Creating a middleware

class ResponseMiddleware(HTTPAdapter):
    def __init__(self):
        super().__init__()
        self.next = None

    def send(self, request, stream=False, timeout=None, verify=True, cert=None, proxies=None):
        if self.next is None:
            return super().send(request, stream, timeout, verify, cert, proxies)

        response = self._next.send(request, stream, timeout, verify, cert, proxies)
        # do something with the response
        return response

Creating requests with middlewares

middlewares = [
    ResponseMiddleware(),
]

requests = HTTPClientFactory.with_graph_middlewares(middlewares=middlewares)

closes #2

[MIchaelMainer]

I need more context on what the plans are for this client.

[ddyett]

Never to early to start adding documentation such as the licensing agreements

[ddyett]

do we need this? It seems longer than just saying if self._middleware but I know python standards also have a thing about being explicit. not sure this adds much though.

[jobala]

I did this for readability. So that the if conditions reads if middleware_present ...

[ddyett]

_AuthMiddleware() [](start = 12, length = 17)

would be good if this test had more than one middleware so you're testing the chaining of the middleware.

[jobala]

I tested that here