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
  19 class HTTPD {
  20 public:
  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         static void request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
  45
  46         void request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
  47
  48
  49         class Stream {
  50         public:
  51                 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
  52                 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
  53
  54                 enum DataType {
  55                         DATA_TYPE_HEADER,
  56                         DATA_TYPE_KEYFRAME,
  57                         DATA_TYPE_OTHER
  58                 };
  59                 void add_data(const char *buf, size_t size, DataType data_type);
  60
  61         private:
  62                 std::mutex buffer_mutex;
  63                 std::condition_variable has_buffered_data;
  64                 std::deque<std::string> buffered_data;  // Protected by <mutex>.
  65                 size_t used_of_buffered_data = 0;  // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
  66                 size_t seen_keyframe = false;
  67         };
  68
  69         std::mutex streams_mutex;
  70         std::set<Stream *> streams;  // Not owned.
  71         std::string header;
  72 };
  73
  74 #endif  // !defined(_HTTPD_H)