| /* |
| * Copyright (C) 2021 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_EXT_BASE_HTTP_HTTP_SERVER_H_ |
| #define INCLUDE_PERFETTO_EXT_BASE_HTTP_HTTP_SERVER_H_ |
| |
| #include <array> |
| #include <initializer_list> |
| #include <list> |
| #include <memory> |
| #include <optional> |
| #include <string> |
| |
| #include "perfetto/base/task_runner.h" |
| #include "perfetto/ext/base/paged_memory.h" |
| #include "perfetto/ext/base/string_view.h" |
| #include "perfetto/ext/base/unix_socket.h" |
| |
| namespace perfetto { |
| namespace base { |
| |
| class HttpServerConnection; |
| |
| struct HttpRequest { |
| explicit HttpRequest(HttpServerConnection* c) : conn(c) {} |
| |
| std::optional<StringView> GetHeader(StringView name) const; |
| |
| HttpServerConnection* conn; |
| |
| // These StringViews point to memory in the rxbuf owned by |conn|. They are |
| // valid only within the OnHttpRequest() call. |
| StringView method; |
| StringView uri; |
| StringView origin; |
| StringView body; |
| bool is_websocket_handshake = false; |
| |
| private: |
| friend class HttpServer; |
| struct Header { |
| StringView name; |
| StringView value; |
| }; |
| |
| static constexpr uint32_t kMaxHeaders = 32; |
| std::array<Header, kMaxHeaders> headers{}; |
| size_t num_headers = 0; |
| }; |
| |
| struct WebsocketMessage { |
| explicit WebsocketMessage(HttpServerConnection* c) : conn(c) {} |
| |
| HttpServerConnection* conn; |
| |
| // Note: message boundaries are not respected in case of fragmentation. |
| // This websocket implementation preserves only the byte stream, but not the |
| // atomicity of inbound messages (like SOCK_STREAM, unlike SOCK_DGRAM). |
| // Holds onto the connection's |rxbuf|. This is valid only within the scope |
| // of the OnWebsocketMessage() callback. |
| StringView data; |
| |
| // If false the payload contains binary data. If true it's supposed to contain |
| // text. Note that there is no guarantee this will be the case. This merely |
| // reflect the opcode that the client sets on each message. |
| bool is_text = false; |
| }; |
| |
| class HttpServerConnection { |
| public: |
| static constexpr size_t kOmitContentLength = static_cast<size_t>(-1); |
| |
| explicit HttpServerConnection(std::unique_ptr<UnixSocket>); |
| ~HttpServerConnection(); |
| |
| void SendResponseHeaders(const char* http_code, |
| std::initializer_list<const char*> headers = {}, |
| size_t content_length = 0); |
| |
| // Works also for websockets. |
| void SendResponseBody(const void* content, size_t content_length); |
| void Close(); |
| |
| // All the above in one shot. |
| void SendResponse(const char* http_code, |
| std::initializer_list<const char*> headers = {}, |
| StringView content = {}, |
| bool force_close = false); |
| void SendResponseAndClose(const char* http_code, |
| std::initializer_list<const char*> headers = {}, |
| StringView content = {}) { |
| SendResponse(http_code, headers, content, true); |
| } |
| |
| // The metods below are only valid for websocket connections. |
| |
| // Upgrade an existing connection to a websocket. This can be called only in |
| // the context of OnHttpRequest(req) if req.is_websocket_handshake == true. |
| // If the origin is not in the |allowed_origins_|, the request will fail with |
| // a 403 error (this is because there is no browser-side CORS support for |
| // websockets). |
| void UpgradeToWebsocket(const HttpRequest&); |
| void SendWebsocketMessage(const void* data, size_t len); |
| void SendWebsocketMessage(StringView sv) { |
| SendWebsocketMessage(sv.data(), sv.size()); |
| } |
| void SendWebsocketFrame(uint8_t opcode, |
| const void* payload, |
| size_t payload_len); |
| |
| bool is_websocket() const { return is_websocket_; } |
| |
| private: |
| friend class HttpServer; |
| |
| size_t rxbuf_avail() { return rxbuf.size() - rxbuf_used; } |
| |
| std::unique_ptr<UnixSocket> sock; |
| PagedMemory rxbuf; |
| size_t rxbuf_used = 0; |
| bool is_websocket_ = false; |
| bool headers_sent_ = false; |
| size_t content_len_headers_ = 0; |
| size_t content_len_actual_ = 0; |
| |
| // If the origin is in the server's |allowed_origins_| this contains the |
| // origin itself. This is used to handle CORS headers. |
| std::string origin_allowed_; |
| |
| // By default treat connections as keep-alive unless the client says |
| // explicitly 'Connection: close'. This improves TraceProcessor's python API. |
| // This is consistent with that nginx does. |
| bool keepalive_ = true; |
| }; |
| |
| class HttpRequestHandler { |
| public: |
| virtual ~HttpRequestHandler(); |
| virtual void OnHttpRequest(const HttpRequest&) = 0; |
| virtual void OnWebsocketMessage(const WebsocketMessage&); |
| virtual void OnHttpConnectionClosed(HttpServerConnection*); |
| }; |
| |
| class HttpServer : public UnixSocket::EventListener { |
| public: |
| HttpServer(TaskRunner*, HttpRequestHandler*); |
| ~HttpServer() override; |
| void Start(int port); |
| void AddAllowedOrigin(const std::string&); |
| |
| private: |
| size_t ParseOneHttpRequest(HttpServerConnection*); |
| size_t ParseOneWebsocketFrame(HttpServerConnection*); |
| void HandleCorsPreflightRequest(const HttpRequest&); |
| bool IsOriginAllowed(StringView); |
| |
| // UnixSocket::EventListener implementation. |
| void OnNewIncomingConnection(UnixSocket*, |
| std::unique_ptr<UnixSocket>) override; |
| void OnConnect(UnixSocket* self, bool connected) override; |
| void OnDisconnect(UnixSocket* self) override; |
| void OnDataAvailable(UnixSocket* self) override; |
| |
| TaskRunner* const task_runner_; |
| HttpRequestHandler* req_handler_; |
| std::unique_ptr<UnixSocket> sock4_; |
| std::unique_ptr<UnixSocket> sock6_; |
| std::list<HttpServerConnection> clients_; |
| std::list<std::string> allowed_origins_; |
| bool origin_error_logged_ = false; |
| }; |
| |
| } // namespace base |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_EXT_BASE_HTTP_HTTP_SERVER_H_ |