git.sesse.net Git - nageru/blob - httpd.h

   1 #ifndef _HTTPD_H
   2 #define _HTTPD_H
   3
   4 // A class dealing with stream output to HTTP.
   5
   6 #include <microhttpd.h>
   7 #include <stddef.h>
   8 #include <stdint.h>
   9 #include <sys/types.h>
  10 #include <condition_variable>
  11 #include <deque>
  12 #include <memory>
  13 #include <mutex>
  14 #include <set>
  15 #include <string>
  16
  17 struct MHD_Connection;
  18 struct MHD_Daemon;
  19
  20 class HTTPD {
  21 public:
  22         HTTPD();
  23         ~HTTPD();
  24
  25         // Should be called before start().
  26         void set_header(const std::string &data) {
  27                 header = data;
  28         }
  29
  30         void start(int port);
  31         void add_data(const char *buf, size_t size, bool keyframe);
  32
  33 private:
  34         static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
  35                                               const char *url, const char *method,
  36                                               const char *version, const char *upload_data,
  37                                               size_t *upload_data_size, void **con_cls);
  38
  39         int answer_to_connection(MHD_Connection *connection,
  40                                  const char *url, const char *method,
  41                                  const char *version, const char *upload_data,
  42                                  size_t *upload_data_size, void **con_cls);
  43
  44         static void free_stream(void *cls);
  45
  46         static void request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
  47
  48         void request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
  49
  50
  51         class Stream {
  52         public:
  53                 enum Framing {
  54                         FRAMING_RAW,
  55                         FRAMING_METACUBE
  56                 };
  57                 Stream(Framing framing) : framing(framing) {}
  58
  59                 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
  60                 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
  61
  62                 enum DataType {
  63                         DATA_TYPE_HEADER,
  64                         DATA_TYPE_KEYFRAME,
  65                         DATA_TYPE_OTHER
  66                 };
  67                 void add_data(const char *buf, size_t size, DataType data_type);
  68                 void stop();
  69
  70         private:
  71                 Framing framing;
  72
  73                 std::mutex buffer_mutex;
  74                 bool should_quit = false;  // Under <buffer_mutex>.
  75                 std::condition_variable has_buffered_data;
  76                 std::deque<std::string> buffered_data;  // Protected by <buffer_mutex>.
  77                 size_t used_of_buffered_data = 0;  // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
  78                 size_t seen_keyframe = false;
  79         };
  80
  81         MHD_Daemon *mhd = nullptr;
  82         std::mutex streams_mutex;
  83         std::set<Stream *> streams;  // Not owned.
  84         std::string header;
  85 };
  86
  87 #endif  // !defined(_HTTPD_H)