15 #define EPOLL_MAX_EVENTS 8192
16 #define EPOLL_TIMEOUT_MS 20
17 #define MAX_CLIENT_REQUEST 16384
19 class CubemapStateProto;
23 class Server : public Thread {
28 // Get the list of all currently connected clients.
29 std::vector<ClientStats> get_client_stats() const;
31 // Set header (both HTTP header and any stream headers) for the given stream.
32 void set_header(const std::string &stream_id, const std::string &header);
34 // Set that the given stream should use the given mark pool from now on.
35 // NOTE: This should be set before any clients are connected!
36 void set_mark_pool(const std::string &stream_id, MarkPool *mark_pool);
38 // These will be deferred until the next time an iteration in do_work() happens,
39 // and the order between them are undefined.
40 // XXX: header should ideally be ordered with respect to data.
41 void add_client_deferred(int sock);
42 void add_data_deferred(const std::string &stream_id, const char *data, size_t bytes);
44 // These should not be called while running, since that would violate
45 // threading assumptions (ie., that epoll is only called from one thread
47 CubemapStateProto serialize();
48 void add_client_from_serialized(const ClientProto &client);
49 void add_stream(const std::string &stream_id, size_t bytes_received);
50 void add_stream_from_serialized(const StreamProto &stream);
53 // Mutex protecting queued_data only. Note that if you want to hold both this
54 // and <mutex> below, you will need to take <mutex> before this one.
55 mutable pthread_mutex_t queued_data_mutex;
57 // Deferred commands that should be run from the do_work() thread as soon as possible.
58 // We defer these for two reasons:
60 // - We only want to fiddle with epoll from one thread at any given time,
61 // and doing add_client() from the acceptor thread would violate that.
62 // - We don't want the input thread(s) hanging on <mutex> when doing
63 // add_data(), since they want to do add_data() rather often, and <mutex>
64 // can be taken a lot of the time.
66 // Protected by <queued_data_mutex>.
67 std::vector<int> queued_add_clients;
68 std::map<std::string, std::string> queued_data;
70 // All variables below this line are protected by the mutex.
71 mutable pthread_mutex_t mutex;
73 // Map from stream ID to stream.
74 std::map<std::string, Stream *> streams;
76 // Map from file descriptor to client.
77 std::map<int, Client> clients;
79 // Used for epoll implementation (obviously).
81 epoll_event events[EPOLL_MAX_EVENTS];
83 // The actual worker thread.
84 virtual void do_work();
86 // Process a client; read and write data as far as we can.
87 // After this call, one of these four is true:
89 // 1. The socket is closed, and the client deleted.
90 // 2. We are still waiting for more data from the client.
91 // 3. We've sent all the data we have to the client,
92 // and put it in <sleeping_clients>.
93 // 4. The socket buffer is full (which means we still have
96 // For #2, we listen for EPOLLIN events. For #3 and #4, we listen
97 // for EPOLLOUT in edge-triggered mode; it will never fire for #3,
98 // but it's cheaper than taking it in and out all the time.
99 void process_client(Client *client);
101 // Close a given client socket, and clean up after it.
102 void close_client(Client *client);
104 // Parse the HTTP request. Returns a HTTP status code (200/400/404).
105 int parse_request(Client *client);
107 // Construct the HTTP header, and set the client into
108 // the SENDING_HEADER state.
109 void construct_header(Client *client);
111 // Construct a generic error with the given line, and set the client into
112 // the SENDING_ERROR state.
113 void construct_error(Client *client, int error_code);
115 // TODO: This function should probably die.
116 Stream *find_stream(const std::string &stream_id);
118 void process_queued_data();
120 void add_client(int sock);
121 void add_data(const std::string &stream_id, const char *data, ssize_t bytes);
124 #endif // !defined(_SERVER_H)