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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef QUICHE_QUIC_TOOLS_QUIC_SIMPLE_SERVER_BACKEND_H_
#define QUICHE_QUIC_TOOLS_QUIC_SIMPLE_SERVER_BACKEND_H_
#include <memory>
#include "quic/core/quic_types.h"
#include "quic/core/web_transport_interface.h"
#include "quic/tools/quic_backend_response.h"
#include "spdy/core/spdy_header_block.h"
namespace quic {
// This interface implements the functionality to fetch a response
// from the backend (such as cache, http-proxy etc) to serve
// requests received by a Quic Server
class QuicSimpleServerBackend {
public:
// This interface implements the methods
// called by the QuicSimpleServerBackend implementation
// to process the request in the backend
class RequestHandler {
public:
virtual ~RequestHandler() {}
virtual QuicConnectionId connection_id() const = 0;
virtual QuicStreamId stream_id() const = 0;
virtual std::string peer_host() const = 0;
// Called when the response is ready at the backend and can be send back to
// the QUIC client.
virtual void OnResponseBackendComplete(
const QuicBackendResponse* response) = 0;
};
struct WebTransportResponse {
spdy::Http2HeaderBlock response_headers;
std::unique_ptr<WebTransportVisitor> visitor;
};
virtual ~QuicSimpleServerBackend() = default;
// This method initializes the backend instance to fetch responses
// from a backend server, in-memory cache etc.
virtual bool InitializeBackend(const std::string& backend_url) = 0;
// Returns true if the backend has been successfully initialized
// and could be used to fetch HTTP requests
virtual bool IsBackendInitialized() const = 0;
// Triggers a HTTP request to be sent to the backend server or cache
// If response is immediately available, the function synchronously calls
// the |request_handler| with the HTTP response.
// If the response has to be fetched over the network, the function
// asynchronously calls |request_handler| with the HTTP response.
virtual void FetchResponseFromBackend(
const spdy::Http2HeaderBlock& request_headers,
const std::string& request_body,
RequestHandler* request_handler) = 0;
// Clears the state of the backend instance
virtual void CloseBackendResponseStream(RequestHandler* request_handler) = 0;
virtual WebTransportResponse ProcessWebTransportRequest(
const spdy::Http2HeaderBlock& /*request_headers*/,
WebTransportSession* /*session*/) {
WebTransportResponse response;
response.response_headers[":status"] = "400";
return response;
}
virtual bool SupportsWebTransport() { return false; }
};
} // namespace quic
#endif // QUICHE_QUIC_TOOLS_QUIC_SIMPLE_SERVER_BACKEND_H_
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