11 #define BACKLOG_SIZE 1048576
12 #define EPOLL_MAX_EVENTS 8192
13 #define EPOLL_TIMEOUT_MS 20
14 #define MAX_CLIENT_REQUEST 16384
17 class CubemapStateProto;
25 // Serialization/deserialization.
26 Client(const ClientProto &serialized, Stream *stream);
27 ClientProto serialize() const;
29 // The file descriptor associated with this socket.
32 enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA, SENDING_ERROR };
35 // The HTTP request, as sent by the client. If we are in READING_REQUEST,
36 // this might not be finished.
39 // What stream we're connecting to; parsed from <request>.
40 // Not relevant for READING_REQUEST.
41 std::string stream_id;
44 // The header we want to send. This is nominally a copy of Stream::header,
45 // but since that might change on reconnects etc., we keep a local copy here.
46 // Only relevant for SENDING_HEADER or SENDING_ERROR; blank otherwise.
47 std::string header_or_error;
49 // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER
51 size_t header_or_error_bytes_sent;
53 // Number of bytes we've sent of data. Only relevant for SENDING_DATA.
58 Stream(const std::string &stream_id);
61 // Serialization/deserialization.
62 Stream(const StreamProto &serialized);
63 StreamProto serialize() const;
65 std::string stream_id;
67 // The HTTP response header, plus the video stream header (if any).
70 // The stream data itself, stored in a circular buffer.
73 // How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
74 // since the buffer wraps.
77 // Clients that are in SENDING_DATA, but that we don't listen on,
78 // because we currently don't have any data for them.
79 // See put_client_to_sleep() and wake_up_all_clients().
80 std::vector<Client *> sleeping_clients;
82 // Clients that we recently got data for (when they were in
83 // <sleeping_clients>).
84 std::vector<Client *> to_process;
86 // Put client to sleep, since there is no more data for it; we will on
87 // longer listen on POLLOUT until we get more data. Also, it will be put
88 // in the list of clients to wake up when we do.
89 void put_client_to_sleep(Client *client);
91 // We have more data, so mark all clients that are sleeping as ready to go.
92 void wake_up_all_clients();
95 Stream(const Stream& other);
103 // Start a new thread that handles clients.
109 CubemapStateProto serialize() const;
111 void add_client(int sock);
112 void add_client_from_serialized(const ClientProto &client);
114 void add_stream(const std::string &stream_id);
115 void add_stream_from_serialized(const StreamProto &stream);
117 void set_header(const std::string &stream_id, const std::string &header);
118 void add_data(const std::string &stream_id, const char *data, size_t bytes);
121 pthread_t worker_thread;
123 // All variables below this line are protected by the mutex.
124 pthread_mutex_t mutex;
126 // If the thread should stop or not.
129 // Map from stream ID to stream.
130 std::map<std::string, Stream *> streams;
132 // Map from file descriptor to client.
133 std::map<int, Client> clients;
135 // Used for epoll implementation (obviously).
137 epoll_event events[EPOLL_MAX_EVENTS];
139 // Recover the this pointer, and call do_work().
140 static void *do_work_thunk(void *arg);
142 // The actual worker thread.
145 // Process a client; read and write data as far as we can.
146 // After this call, one of these four is true:
148 // 1. The socket is closed, and the client deleted.
149 // 2. We are still waiting for more data from the client.
150 // 3. We've sent all the data we have to the client,
151 // and put it in <sleeping_clients>.
152 // 4. The socket buffer is full (which means we still have
153 // data outstanding).
155 // For #2, we listen for EPOLLIN events. For #3 and #4, we listen
156 // for EPOLLOUT in edge-triggered mode; it will never fire for #3,
157 // but it's cheaper than taking it in and out all the time.
158 void process_client(Client *client);
160 // Close a given client socket, and clean up after it.
161 void close_client(Client *client);
163 // Parse the HTTP request. Returns a HTTP status code (200/400/404).
164 int parse_request(Client *client);
166 // Construct the HTTP header, and set the client into
167 // the SENDING_HEADER state.
168 void construct_header(Client *client);
170 // Construct a generic error with the given line, and set the client into
171 // the SENDING_ERROR state.
172 void construct_error(Client *client, int error_code);
174 // TODO: This function should probably die.
175 Stream *find_stream(const std::string &stream_id);
178 #endif // !defined(_SERVER_H)