#include <stdint.h>
#include <pthread.h>
#include <sys/epoll.h>
+#include <time.h>
#include <string>
#include <map>
#include <vector>
class Stream;
class StreamProto;
+// Digested statistics for writing to logs etc.
+struct ClientStats {
+ std::string stream_id;
+ std::string remote_addr;
+ time_t connect_time;
+ size_t bytes_sent;
+};
+
struct Client {
Client() {}
Client(int sock);
Client(const ClientProto &serialized, Stream *stream);
ClientProto serialize() const;
+ ClientStats get_stats() const;
+
// The file descriptor associated with this socket.
int sock;
+ // 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;
// Stop the thread.
void stop();
+
+ // Get the list of all currently connected clients.
+ std::vector<ClientStats> get_client_stats() const;
- CubemapStateProto serialize() const;
+ // Set header (both HTTP header and any stream headers) for the given stream.
+ void set_header(const std::string &stream_id, const std::string &header);
- void add_client(int sock);
- void add_client_from_serialized(const ClientProto &client);
+ // These will be deferred until the next time an iteration in do_work() happens,
+ // and the order between them are undefined.
+ // XXX: header should ideally be ordered with respect to data.
+ void add_client_deferred(int sock);
+ void add_data_deferred(const std::string &stream_id, const char *data, size_t bytes);
+ // These should not be called while running, since that would violate
+ // threading assumptions (ie., that epoll is only called from one thread
+ // at the same time).
+ CubemapStateProto serialize();
+ 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;
+ // Mutex protecting queued_data only. Note that if you want to hold both this
+ // and <mutex> below, you will need to take <mutex> before this one.
+ mutable pthread_mutex_t queued_data_mutex;
+
+ // Deferred commands that should be run from the do_work() thread as soon as possible.
+ // We defer these for two reasons:
+ //
+ // - We only want to fiddle with epoll from one thread at any given time,
+ // and doing add_client() from the acceptor thread would violate that.
+ // - We don't want the input thread(s) hanging on <mutex> when doing
+ // add_data(), since they want to do add_data() rather often, and <mutex>
+ // can be taken a lot of the time.
+ //
+ // Protected by <queued_data_mutex>.
+ std::vector<int> queued_add_clients;
+ std::map<std::string, std::string> queued_data;
+
// All variables below this line are protected by the mutex.
- pthread_mutex_t mutex;
+ mutable pthread_mutex_t mutex;
// If the thread should stop or not.
bool should_stop;
// TODO: This function should probably die.
Stream *find_stream(const std::string &stream_id);
+
+ void process_queued_data();
+
+ void add_client(int sock);
+ void add_data(const std::string &stream_id, const char *data, size_t bytes);
};
#endif // !defined(_SERVER_H)