10 #define BACKLOG_SIZE 1048576
11 #define EPOLL_MAX_EVENTS 8192
12 #define EPOLL_TIMEOUT_MS 20
13 #define MAX_CLIENT_REQUEST 16384
16 // The file descriptor associated with this socket.
19 enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA };
22 // The HTTP request, as sent by the client. If we are in READING_REQUEST,
23 // this might not be finished.
24 std::string client_request;
26 // What stream we're connecting to; parsed from client_request.
27 // Not relevant for READING_REQUEST.
28 std::string stream_id;
30 // The header we want to send. This is nominally a copy of Stream::header,
31 // but since that might change on reconnects etc., we keep a local copy here.
32 // Only relevant for SENDING_HEADER; blank otherwise.
35 // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER.
36 size_t header_bytes_sent;
38 // Number of bytes we've sent of data. Only relevant for SENDING_DATA.
43 // The HTTP response header, plus the video stream header (if any).
46 // The stream data itself, stored in a circular buffer.
47 char data[BACKLOG_SIZE];
49 // How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
50 // since the buffer wraps.
58 // Start a new thread that handles clients.
60 void add_client(int sock);
61 void add_stream(const std::string &stream_id);
62 void set_header(const std::string &stream_id, const std::string &header);
63 void add_data(const std::string &stream_id, const char *data, size_t bytes);
66 pthread_mutex_t mutex;
68 // Map from stream ID to stream.
69 std::map<std::string, Stream> streams;
71 // Map from file descriptor to client.
72 std::map<int, Client> clients;
74 // Used for epoll implementation (obviously).
76 epoll_event events[EPOLL_MAX_EVENTS];
78 // Clients that are in SENDING_DATA, but that we don't listen on,
79 // because we currently don't have any data for them.
80 // See put_client_to_sleep() and wake_up_all_clients().
81 std::vector<int> sleeping_clients;
83 // Recover the this pointer, and call do_work().
84 static void *do_work_thunk(void *arg);
86 // The actual worker thread.
89 void process_client(Client *client);
91 // Close a given client socket, and clean up after it.
92 void close_client(Client *client);
94 // Parse the HTTP request, construct the header, and set the client into
95 // the SENDING_HEADER state.
96 void parse_request(Client *client);
98 // Put client to sleep, since there is no more data for it; we will on
99 // longer listen on POLLOUT until we get more data. Also, it will be put
100 // in the list of clients to wake up when we do.
101 void put_client_to_sleep(Client *client);
103 // We have more data, so mark all clients that are sleeping as ready to go.
104 void wake_up_all_clients();
107 #endif // !defined(_SERVER_H)