4 // A class dealing with stream output to HTTP.
10 #include <condition_variable>
16 #include <unordered_map>
19 struct MHD_Connection;
24 // Returns a pair of content and content-type.
25 using EndpointCallback = std::function<std::pair<std::string, std::string>()>;
30 // Should be called before start().
31 void set_header(const std::string &data) {
35 // Should be called before start() (due to threading issues).
40 void add_endpoint(const std::string &url, const EndpointCallback &callback, CORSPolicy cors_policy) {
41 endpoints[url] = Endpoint{ callback, cors_policy };
45 void add_data(const char *buf, size_t size, bool keyframe);
46 int64_t get_num_connected_clients() const {
47 return metric_num_connected_clients.load();
51 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
52 const char *url, const char *method,
53 const char *version, const char *upload_data,
54 size_t *upload_data_size, void **con_cls);
56 int answer_to_connection(MHD_Connection *connection,
57 const char *url, const char *method,
58 const char *version, const char *upload_data,
59 size_t *upload_data_size, void **con_cls);
61 static void free_stream(void *cls);
70 Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
72 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
73 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
80 void add_data(const char *buf, size_t size, DataType data_type);
82 HTTPD *get_parent() const { return parent; }
88 std::mutex buffer_mutex;
89 bool should_quit = false; // Under <buffer_mutex>.
90 std::condition_variable has_buffered_data;
91 std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
92 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
93 size_t seen_keyframe = false;
96 MHD_Daemon *mhd = nullptr;
97 std::mutex streams_mutex;
98 std::set<Stream *> streams; // Not owned.
100 EndpointCallback callback;
101 CORSPolicy cors_policy;
103 std::unordered_map<std::string, Endpoint> endpoints;
107 std::atomic<int64_t> metric_num_connected_clients{0};
110 #endif // !defined(_HTTPD_H)