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