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).
36 void add_endpoint(const std::string &url, const EndpointCallback &callback) {
37 endpoints[url] = callback;
41 void add_data(const char *buf, size_t size, bool keyframe);
42 int64_t get_num_connected_clients() const {
43 return metric_num_connected_clients.load();
47 static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
48 const char *url, const char *method,
49 const char *version, const char *upload_data,
50 size_t *upload_data_size, void **con_cls);
52 int answer_to_connection(MHD_Connection *connection,
53 const char *url, const char *method,
54 const char *version, const char *upload_data,
55 size_t *upload_data_size, void **con_cls);
57 static void free_stream(void *cls);
66 Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
68 static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
69 ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
76 void add_data(const char *buf, size_t size, DataType data_type);
78 HTTPD *get_parent() const { return parent; }
84 std::mutex buffer_mutex;
85 bool should_quit = false; // Under <buffer_mutex>.
86 std::condition_variable has_buffered_data;
87 std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
88 size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
89 size_t seen_keyframe = false;
92 MHD_Daemon *mhd = nullptr;
93 std::mutex streams_mutex;
94 std::set<Stream *> streams; // Not owned.
95 std::unordered_map<std::string, EndpointCallback> endpoints;
99 std::atomic<int64_t> metric_num_connected_clients{0};
102 #endif // !defined(_HTTPD_H)