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