- time_t connect_time;
- size_t bytes_sent;
-};
-
-struct Client {
- Client() {}
- Client(int sock);
-
- // Serialization/deserialization.
- Client(const ClientProto &serialized, Stream *stream);
- ClientProto serialize() const;
-
- ClientStats get_stats() const;
-
- // The file descriptor associated with this socket.
- int sock;
-
- // The fwmark associated with this socket (or 0).
- int fwmark;
-
- // Some information only used for logging.
- std::string remote_addr;
- time_t connect_time;
-
- enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA, SENDING_ERROR };
- State state;
-
- // The HTTP request, as sent by the client. If we are in READING_REQUEST,
- // this might not be finished.
- std::string request;
-
- // What stream we're connecting to; parsed from <request>.
- // Not relevant for READING_REQUEST.
- std::string stream_id;
- Stream *stream;
-
- // The header we want to send. This is nominally a copy of Stream::header,
- // but since that might change on reconnects etc., we keep a local copy here.
- // Only relevant for SENDING_HEADER or SENDING_ERROR; blank otherwise.
- std::string header_or_error;
-
- // Number of bytes we've sent of the header. Only relevant for SENDING_HEADER
- // or SENDING_ERROR.
- size_t header_or_error_bytes_sent;
-
- // Number of bytes we've sent of data. Only relevant for SENDING_DATA.
- size_t bytes_sent;
-};
-
-struct Stream {
- Stream(const std::string &stream_id);
- ~Stream();
-
- // Serialization/deserialization.
- Stream(const StreamProto &serialized);
- StreamProto serialize();
-
- std::string stream_id;
-
- // The HTTP response header, plus the video stream header (if any).
- std::string header;
-
- // The stream data itself, stored in a circular buffer.q
- //
- // We store our data in a file, so that we can send the data to the
- // kernel only once (with write()). We then use sendfile() for each
- // client, which effectively zero-copies it out of the kernel's buffer
- // cache. This is significantly more efficient than doing write() from
- // a userspace memory buffer, since the latter makes the kernel copy
- // the same data from userspace many times.
- int data_fd;
-
- // How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
- // since the buffer wraps.
- size_t data_size;
-
- // Clients that are in SENDING_DATA, but that we don't listen on,
- // because we currently don't have any data for them.
- // See put_client_to_sleep() and wake_up_all_clients().
- std::vector<Client *> sleeping_clients;
-
- // Clients that we recently got data for (when they were in
- // <sleeping_clients>).
- std::vector<Client *> to_process;
-
- // What pool to fetch marks from, or NULL.
- MarkPool *mark_pool;
-
- // Put client to sleep, since there is no more data for it; we will on
- // longer listen on POLLOUT until we get more data. Also, it will be put
- // in the list of clients to wake up when we do.
- void put_client_to_sleep(Client *client);
-
- // We have more data, so mark all clients that are sleeping as ready to go.
- void wake_up_all_clients();
-
-private:
- Stream(const Stream& other);