515 lines
22 KiB
C
515 lines
22 KiB
C
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#pragma once
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/**
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0.
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*/
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#include <aws/http/connection.h>
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#include <aws/http/proxy.h>
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#include <aws/http/request_response.h>
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#include <aws/crt/Types.h>
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#include <aws/crt/io/Bootstrap.h>
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#include <aws/crt/io/SocketOptions.h>
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#include <aws/crt/io/TlsOptions.h>
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#include <functional>
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#include <memory>
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namespace Aws
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{
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namespace Crt
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{
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namespace Io
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{
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class ClientBootstrap;
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}
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namespace Http
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{
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class HttpClientConnection;
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class HttpStream;
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class HttpClientStream;
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class HttpRequest;
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class HttpProxyStrategy;
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using HttpHeader = aws_http_header;
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/**
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* Invoked upon connection setup, whether it was successful or not. If the connection was
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* successfully established, `connection` will be valid and errorCode will be AWS_ERROR_SUCCESS.
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* Upon an error, `connection` will not be valid, and errorCode will contain the cause of the connection
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* failure.
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*/
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using OnConnectionSetup =
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std::function<void(const std::shared_ptr<HttpClientConnection> &connection, int errorCode)>;
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/**
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* Invoked upon connection shutdown. `connection` will always be a valid pointer. `errorCode` will specify
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* shutdown reason. A graceful connection close will set `errorCode` to AWS_ERROR_SUCCESS.
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* Internally, the connection pointer will be unreferenced immediately after this call; if you took a
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* reference to it in OnConnectionSetup(), you'll need to release your reference before the underlying
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* memory is released. If you never took a reference to it, the resources for the connection will be
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* immediately released after completion of this callback.
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*/
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using OnConnectionShutdown = std::function<void(HttpClientConnection &connection, int errorCode)>;
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/**
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* Called as headers are received from the peer. `headersArray` will contain the header value
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* read from the wire. The number of entries in `headersArray` are specified in `headersCount`.
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*
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* Keep in mind that this function will likely be called multiple times until all headers are received.
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*
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* On HttpStream, this function must be set.
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*/
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using OnIncomingHeaders = std::function<void(
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HttpStream &stream,
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enum aws_http_header_block headerBlock,
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const HttpHeader *headersArray,
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std::size_t headersCount)>;
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/**
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* Invoked when the headers portion of the message has been completely received. `hasBody` will indicate
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* if there is an incoming body.
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*
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* On HttpStream, this function can be empty.
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*/
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using OnIncomingHeadersBlockDone =
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std::function<void(HttpStream &stream, enum aws_http_header_block block)>;
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/**
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* Invoked as chunks of the body are read. `data` contains the data read from the wire. If chunked encoding
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* was used, it will already be decoded (TBD).
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*
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* On HttpStream, this function can be empty if you are not expecting a body (e.g. a HEAD request).
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*/
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using OnIncomingBody = std::function<void(HttpStream &stream, const ByteCursor &data)>;
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/**
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* Invoked upon completion of the stream. This means the request has been sent and a completed response
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* has been received (in client mode), or the request has been received and the response has been completed.
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*
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* In H2, this will mean RST_STREAM state has been reached for the stream.
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*
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* On HttpStream, this function must be set.
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*/
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using OnStreamComplete = std::function<void(HttpStream &stream, int errorCode)>;
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/**
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* POD structure used for setting up an Http Request
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*/
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struct AWS_CRT_CPP_API HttpRequestOptions
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{
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/**
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* The actual http request
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*/
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HttpRequest *request;
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/**
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* See `OnIncomingHeaders` for more info. This value must be set.
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*/
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OnIncomingHeaders onIncomingHeaders;
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OnIncomingHeadersBlockDone onIncomingHeadersBlockDone;
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/**
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* See `OnIncomingBody` for more info. This value can be empty if you will not be receiving a body.
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*/
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OnIncomingBody onIncomingBody;
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/**
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* See `OnStreamComplete` for more info. This value can be empty.
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*/
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OnStreamComplete onStreamComplete;
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};
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/**
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* Represents a single http message exchange (request/response) or in H2, it can also represent
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* a PUSH_PROMISE followed by the accompanying Response.
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*/
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class AWS_CRT_CPP_API HttpStream : public std::enable_shared_from_this<HttpStream>
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{
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public:
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virtual ~HttpStream();
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HttpStream(const HttpStream &) = delete;
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HttpStream(HttpStream &&) = delete;
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HttpStream &operator=(const HttpStream &) = delete;
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HttpStream &operator=(HttpStream &&) = delete;
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/**
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* Get the underlying connection for the stream.
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*/
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HttpClientConnection &GetConnection() const noexcept;
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/**
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* @return request's Http Response Code. Requires response headers to have been processed first. *
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*/
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virtual int GetResponseStatusCode() const noexcept = 0;
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/**
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* Updates the read window on the connection. In Http 1.1 this relieves TCP back pressure, in H2
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* this will trigger two WINDOW_UPDATE frames, one for the connection and one for the stream.
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*
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* You do not need to call this unless you utilized the `outWindowUpdateSize` in `OnIncomingBody`.
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* See `OnIncomingBody` for more information.
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*
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* `incrementSize` is the amount to update the read window by.
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*/
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void UpdateWindow(std::size_t incrementSize) noexcept;
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protected:
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aws_http_stream *m_stream;
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std::shared_ptr<HttpClientConnection> m_connection;
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HttpStream(const std::shared_ptr<HttpClientConnection> &connection) noexcept;
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private:
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OnIncomingHeaders m_onIncomingHeaders;
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OnIncomingHeadersBlockDone m_onIncomingHeadersBlockDone;
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OnIncomingBody m_onIncomingBody;
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OnStreamComplete m_onStreamComplete;
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static int s_onIncomingHeaders(
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struct aws_http_stream *stream,
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enum aws_http_header_block headerBlock,
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const struct aws_http_header *headerArray,
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size_t numHeaders,
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void *userData) noexcept;
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static int s_onIncomingHeaderBlockDone(
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struct aws_http_stream *stream,
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enum aws_http_header_block headerBlock,
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void *userData) noexcept;
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static int s_onIncomingBody(
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struct aws_http_stream *stream,
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const struct aws_byte_cursor *data,
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void *userData) noexcept;
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static void s_onStreamComplete(struct aws_http_stream *stream, int errorCode, void *userData) noexcept;
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friend class HttpClientConnection;
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};
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struct ClientStreamCallbackData
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{
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ClientStreamCallbackData() : allocator(nullptr), stream(nullptr) {}
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Allocator *allocator;
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std::shared_ptr<HttpStream> stream;
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};
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/**
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* Subclass that represents an http client's view of an HttpStream.
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*/
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class AWS_CRT_CPP_API HttpClientStream final : public HttpStream
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{
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public:
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~HttpClientStream();
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HttpClientStream(const HttpClientStream &) = delete;
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HttpClientStream(HttpClientStream &&) = delete;
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HttpClientStream &operator=(const HttpClientStream &) = delete;
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HttpClientStream &operator=(HttpClientStream &&) = delete;
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/**
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* If this stream was initiated as a request, assuming the headers of the response has been
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* received, this value contains the Http Response Code. *
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*/
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virtual int GetResponseStatusCode() const noexcept override;
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/**
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* Activates the request's outgoing stream processing.
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*
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* Returns true on success, false otherwise.
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*/
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bool Activate() noexcept;
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private:
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HttpClientStream(const std::shared_ptr<HttpClientConnection> &connection) noexcept;
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ClientStreamCallbackData m_callbackData;
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friend class HttpClientConnection;
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};
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/**
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* @deprecated enum that designates what kind of authentication, if any, to use when connecting to a
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* proxy server.
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*
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* Here for backwards compatibility. Has been superceded by proxy strategies.
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*/
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enum class AwsHttpProxyAuthenticationType
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{
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None,
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Basic,
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};
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/**
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* Mirror of aws_http_proxy_connection_type enum. Indicates the basic http proxy behavior of the
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* proxy we're connecting to.
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*/
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enum class AwsHttpProxyConnectionType
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{
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/**
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* Deprecated, but 0-valued for backwards compatibility
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*
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* If tls options are provided (for the main connection) then treat the proxy as a tunneling proxy
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* If tls options are not provided (for the main connection), then treat the proxy as a forwarding
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* proxy
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*/
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Legacy = AWS_HPCT_HTTP_LEGACY,
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/**
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* Use the proxy to forward http requests. Attempting to use both this mode and TLS to the destination
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* is a configuration error.
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*/
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Forwarding = AWS_HPCT_HTTP_FORWARD,
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/**
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* Use the proxy to establish an http connection via a CONNECT request to the proxy. Works for both
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* plaintext and tls connections.
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*/
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Tunneling = AWS_HPCT_HTTP_TUNNEL,
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};
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/**
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* Configuration structure that holds all proxy-related http connection options
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*/
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class AWS_CRT_CPP_API HttpClientConnectionProxyOptions
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{
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public:
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HttpClientConnectionProxyOptions();
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HttpClientConnectionProxyOptions(const HttpClientConnectionProxyOptions &rhs) = default;
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HttpClientConnectionProxyOptions(HttpClientConnectionProxyOptions &&rhs) = default;
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HttpClientConnectionProxyOptions &operator=(const HttpClientConnectionProxyOptions &rhs) = default;
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HttpClientConnectionProxyOptions &operator=(HttpClientConnectionProxyOptions &&rhs) = default;
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~HttpClientConnectionProxyOptions() = default;
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/**
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* Intended for internal use only. Initializes the C proxy configuration structure,
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* aws_http_proxy_options, from an HttpClientConnectionProxyOptions instance.
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*
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* @param raw_options - output parameter containing low level proxy options to be passed to the C
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* interface
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*
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*/
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void InitializeRawProxyOptions(struct aws_http_proxy_options &raw_options) const;
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/**
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* The name of the proxy server to connect through.
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* Required.
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*/
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String HostName;
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/**
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* The port of the proxy server to connect to.
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* Required.
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*/
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uint32_t Port;
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/**
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* Sets the TLS options for the connection to the proxy.
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* Optional.
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*/
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Optional<Io::TlsConnectionOptions> TlsOptions;
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/**
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* What kind of proxy connection to make
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*/
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AwsHttpProxyConnectionType ProxyConnectionType;
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/**
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* Proxy strategy to use while negotiating the connection. Use null for no additional
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* steps.
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*/
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std::shared_ptr<HttpProxyStrategy> ProxyStrategy;
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/**
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* @deprecated What kind of authentication approach to use when connecting to the proxy
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* Replaced by proxy strategy
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*
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* Backwards compatibility achieved by invoking CreateBasicHttpProxyStrategy if
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* (1) ProxyStrategy is null
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* (2) AuthType is AwsHttpProxyAuthenticationType::Basic
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*/
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AwsHttpProxyAuthenticationType AuthType;
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/**
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* @deprecated The username to use if connecting to the proxy via basic authentication
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* Replaced by using the result of CreateBasicHttpProxyStrategy()
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*/
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String BasicAuthUsername;
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/**
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* @deprecated The password to use if connecting to the proxy via basic authentication
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* Replaced by using the result of CreateBasicHttpProxyStrategy()
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*/
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String BasicAuthPassword;
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};
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/**
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* Configuration structure holding all options relating to http connection establishment
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*/
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class AWS_CRT_CPP_API HttpClientConnectionOptions
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{
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public:
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HttpClientConnectionOptions();
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HttpClientConnectionOptions(const HttpClientConnectionOptions &rhs) = default;
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HttpClientConnectionOptions(HttpClientConnectionOptions &&rhs) = default;
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~HttpClientConnectionOptions() = default;
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HttpClientConnectionOptions &operator=(const HttpClientConnectionOptions &rhs) = default;
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HttpClientConnectionOptions &operator=(HttpClientConnectionOptions &&rhs) = default;
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/**
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* The client bootstrap to use for setting up and tearing down connections.
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* Note: If null, then the default ClientBootstrap is used
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* (see Aws::Crt::ApiHandle::GetOrCreateStaticDefaultClientBootstrap)
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*/
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Io::ClientBootstrap *Bootstrap;
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/**
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* The TCP read window allowed for Http 1.1 connections and Initial Windows for H2 connections.
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*/
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size_t InitialWindowSize;
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/**
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* The callback invoked on connection establishment, whether success or failure.
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* See `OnConnectionSetup` for more info.
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* Required.
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*/
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OnConnectionSetup OnConnectionSetupCallback;
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/**
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* The callback invoked on connection shutdown.
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* See `OnConnectionShutdown` for more info.
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* Required.
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*/
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OnConnectionShutdown OnConnectionShutdownCallback;
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/**
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* The name of the http server to connect to.
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* Required.
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*/
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String HostName;
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/**
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* The port of the http server to connect to.
|
||
|
|
* Required.
|
||
|
|
*/
|
||
|
|
uint32_t Port;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The socket options of the connection.
|
||
|
|
* Required.
|
||
|
|
*/
|
||
|
|
Io::SocketOptions SocketOptions;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The TLS options for the http connection.
|
||
|
|
* Optional.
|
||
|
|
*/
|
||
|
|
Optional<Io::TlsConnectionOptions> TlsOptions;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The proxy options for the http connection.
|
||
|
|
* Optional.
|
||
|
|
*/
|
||
|
|
Optional<HttpClientConnectionProxyOptions> ProxyOptions;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* If set to true, then the TCP read back pressure mechanism will be enabled. You should
|
||
|
|
* only use this if you're allowing http response body data to escape the callbacks. E.g. you're
|
||
|
|
* putting the data into a queue for another thread to process and need to make sure the memory
|
||
|
|
* usage is bounded. If this is enabled, you must call HttpStream::UpdateWindow() for every
|
||
|
|
* byte read from the OnIncomingBody callback.
|
||
|
|
*/
|
||
|
|
bool ManualWindowManagement;
|
||
|
|
};
|
||
|
|
|
||
|
|
enum class HttpVersion
|
||
|
|
{
|
||
|
|
Unknown = AWS_HTTP_VERSION_UNKNOWN,
|
||
|
|
Http1_0 = AWS_HTTP_VERSION_1_0,
|
||
|
|
Http1_1 = AWS_HTTP_VERSION_1_1,
|
||
|
|
Http2 = AWS_HTTP_VERSION_2,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Represents a connection from a Http Client to a Server.
|
||
|
|
*/
|
||
|
|
class AWS_CRT_CPP_API HttpClientConnection : public std::enable_shared_from_this<HttpClientConnection>
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
virtual ~HttpClientConnection() = default;
|
||
|
|
HttpClientConnection(const HttpClientConnection &) = delete;
|
||
|
|
HttpClientConnection(HttpClientConnection &&) = delete;
|
||
|
|
HttpClientConnection &operator=(const HttpClientConnection &) = delete;
|
||
|
|
HttpClientConnection &operator=(HttpClientConnection &&) = delete;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Make a new client initiated request on this connection.
|
||
|
|
*
|
||
|
|
* If you take a reference to the return value, the memory and resources for the connection
|
||
|
|
* and stream will not be cleaned up until you release it. You can however, release the reference
|
||
|
|
* as soon as you don't need it anymore. The internal reference count ensures the resources will
|
||
|
|
* not be freed until the stream is completed.
|
||
|
|
*
|
||
|
|
* Returns an instance of HttpStream upon success and nullptr on failure.
|
||
|
|
*
|
||
|
|
* You must call HttpClientStream::Activate() to begin outgoing processing of the stream.
|
||
|
|
*/
|
||
|
|
std::shared_ptr<HttpClientStream> NewClientStream(const HttpRequestOptions &requestOptions) noexcept;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @return true unless the connection is closed or closing.
|
||
|
|
*/
|
||
|
|
bool IsOpen() const noexcept;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initiate a shutdown of the connection. Sometimes, connections are persistent and you want
|
||
|
|
* to close them before shutting down your application or whatever is consuming this interface.
|
||
|
|
*
|
||
|
|
* Assuming `OnConnectionShutdown` has not already been invoked, it will be invoked as a result of this
|
||
|
|
* call.
|
||
|
|
*/
|
||
|
|
void Close() noexcept;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @return protocol version the connection used
|
||
|
|
*/
|
||
|
|
HttpVersion GetVersion() noexcept;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @return the value of the last aws error encountered by operations on this instance.
|
||
|
|
*/
|
||
|
|
int LastError() const noexcept { return m_lastError; }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create a new Https Connection to hostName:port, using `socketOptions` for tcp options and
|
||
|
|
* `tlsConnOptions` for TLS/SSL options. If `tlsConnOptions` is null http (plain-text) will be used.
|
||
|
|
*
|
||
|
|
* returns true on success, and false on failure. If false is returned, `onConnectionSetup` will not
|
||
|
|
* be invoked. On success, `onConnectionSetup` will be called, either with a connection, or an
|
||
|
|
* errorCode.
|
||
|
|
*/
|
||
|
|
static bool CreateConnection(
|
||
|
|
const HttpClientConnectionOptions &connectionOptions,
|
||
|
|
Allocator *allocator) noexcept;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
HttpClientConnection(aws_http_connection *m_connection, Allocator *allocator) noexcept;
|
||
|
|
aws_http_connection *m_connection;
|
||
|
|
|
||
|
|
private:
|
||
|
|
Allocator *m_allocator;
|
||
|
|
int m_lastError;
|
||
|
|
|
||
|
|
static void s_onClientConnectionSetup(
|
||
|
|
struct aws_http_connection *connection,
|
||
|
|
int error_code,
|
||
|
|
void *user_data) noexcept;
|
||
|
|
static void s_onClientConnectionShutdown(
|
||
|
|
struct aws_http_connection *connection,
|
||
|
|
int error_code,
|
||
|
|
void *user_data) noexcept;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace Http
|
||
|
|
} // namespace Crt
|
||
|
|
} // namespace Aws
|