10 #define BACKLOG_SIZE 1048576
11 #define EPOLL_MAX_EVENTS 8192
12 #define EPOLL_TIMEOUT_MS 20
13 #define MAX_CLIENT_REQUEST 16384
21 // Serialization/deserialization.
22 Client(const ClientProto &serialized);
23 ClientProto serialize() const;
25 // The file descriptor associated with this socket.
28 enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA };
31 // The HTTP request, as sent by the client. If we are in READING_REQUEST,
32 // this might not be finished.
35 // What stream we're connecting to; parsed from <request>.
36 // Not relevant for READING_REQUEST.
37 std::string stream_id;
39 // The header we want to send. This is nominally a copy of Stream::header,
40 // but since that might change on reconnects etc., we keep a local copy here.
41 // Only relevant for SENDING_HEADER; blank otherwise.
44 // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER.
45 size_t header_bytes_sent;
47 // Number of bytes we've sent of data. Only relevant for SENDING_DATA.
52 // The HTTP response header, plus the video stream header (if any).
55 // The stream data itself, stored in a circular buffer.
56 char data[BACKLOG_SIZE];
58 // How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
59 // since the buffer wraps.
67 // Start a new thread that handles clients.
73 void add_client(int sock);
74 void add_stream(const std::string &stream_id);
75 void set_header(const std::string &stream_id, const std::string &header);
76 void add_data(const std::string &stream_id, const char *data, size_t bytes);
79 pthread_t worker_thread;
81 // All variables below this line are protected by the mutex.
82 pthread_mutex_t mutex;
84 // If the thread should stop or not.
87 // Map from stream ID to stream.
88 std::map<std::string, Stream> streams;
90 // Map from file descriptor to client.
91 std::map<int, Client> clients;
93 // Used for epoll implementation (obviously).
95 epoll_event events[EPOLL_MAX_EVENTS];
97 // Clients that are in SENDING_DATA, but that we don't listen on,
98 // because we currently don't have any data for them.
99 // See put_client_to_sleep() and wake_up_all_clients().
100 std::vector<int> sleeping_clients;
102 // Recover the this pointer, and call do_work().
103 static void *do_work_thunk(void *arg);
105 // The actual worker thread.
108 void process_client(Client *client);
110 // Close a given client socket, and clean up after it.
111 void close_client(Client *client);
113 // Parse the HTTP request, construct the header, and set the client into
114 // the SENDING_HEADER state.
115 void parse_request(Client *client);
117 // Put client to sleep, since there is no more data for it; we will on
118 // longer listen on POLLOUT until we get more data. Also, it will be put
119 // in the list of clients to wake up when we do.
120 void put_client_to_sleep(Client *client);
122 // We have more data, so mark all clients that are sleeping as ready to go.
123 void wake_up_all_clients();
126 #endif // !defined(_SERVER_H)