#include <stdint.h>
#include <pthread.h>
+#include <sys/epoll.h>
#include <string>
#include <map>
+#include <vector>
#define BACKLOG_SIZE 1048576
+#define EPOLL_MAX_EVENTS 8192
+#define EPOLL_TIMEOUT_MS 20
+#define MAX_CLIENT_REQUEST 16384
+
+class ClientProto;
+class CubemapStateProto;
+class StreamProto;
struct Client {
+ Client() {}
+ Client(int sock);
+
+ // Serialization/deserialization.
+ Client(const ClientProto &serialized);
+ ClientProto serialize() const;
+
+ // The file descriptor associated with this socket.
+ int sock;
+
enum State { READING_REQUEST, SENDING_HEADER, SENDING_DATA };
State state;
// The HTTP request, as sent by the client. If we are in READING_REQUEST,
// this might not be finished.
- std::string client_request;
+ std::string request;
-#if 0
- // What stream we're connecting to; parsed from client_request.
+ // What stream we're connecting to; parsed from <request>.
// Not relevant for READING_REQUEST.
- string stream_id;
-#endif
+ std::string stream_id;
+
+ // 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; blank otherwise.
+ std::string header;
// Number of bytes we've sent of the header. Only relevant for SENDING_HEADER.
size_t header_bytes_sent;
};
struct Stream {
+ Stream(const std::string &stream_id);
+ ~Stream();
+
+ // Serialization/deserialization.
+ Stream(const StreamProto &serialized);
+ StreamProto serialize() const;
+
+ 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.
- char data[BACKLOG_SIZE];
+ char *data;
// How many bytes <data> contains. Can very well be larger than BACKLOG_SIZE,
// since the buffer wraps.
size_t data_size;
+
+private:
+ Stream(const Stream& other);
};
class Server {
public:
Server();
+ ~Server();
// Start a new thread that handles clients.
void run();
+
+ // Stop the thread.
+ void stop();
+
+ CubemapStateProto serialize() const;
+
void add_client(int sock);
+ void add_client_from_serialized(const ClientProto &client);
+
void add_stream(const std::string &stream_id);
+ void add_stream_from_serialized(const StreamProto &stream);
+
void set_header(const std::string &stream_id, const std::string &header);
void add_data(const std::string &stream_id, const char *data, size_t bytes);
private:
+ pthread_t worker_thread;
+
+ // All variables below this line are protected by the mutex.
pthread_mutex_t mutex;
+ // If the thread should stop or not.
+ bool should_stop;
+
// Map from stream ID to stream.
- std::map<std::string, Stream> streams;
+ std::map<std::string, Stream *> streams;
// Map from file descriptor to client.
std::map<int, Client> clients;
+ // Used for epoll implementation (obviously).
int epoll_fd;
+ epoll_event events[EPOLL_MAX_EVENTS];
+
+ // 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<int> sleeping_clients;
// Recover the this pointer, and call do_work().
static void *do_work_thunk(void *arg);
// The actual worker thread.
void do_work();
+
+ void process_client(Client *client);
+
+ // Close a given client socket, and clean up after it.
+ void close_client(Client *client);
+
+ // Parse the HTTP request.
+ void parse_request(Client *client);
+
+ // Construct the HTTP header, and set the client into
+ // the SENDING_HEADER state.
+ void construct_header(Client *client);
+
+ // 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();
+
+ // TODO: This function should probably die.
+ Stream *find_stream(const std::string &stream_id);
};
#endif // !defined(_SERVER_H)