// A class dealing with stream output to HTTP.
-#include <microhttpd.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
+#include <atomic>
#include <condition_variable>
#include <deque>
-#include <memory>
+#include <functional>
#include <mutex>
#include <set>
#include <string>
+#include <unordered_map>
+#include <utility>
struct MHD_Connection;
+struct MHD_Daemon;
class HTTPD {
public:
+ // Returns a pair of content and content-type.
+ using EndpointCallback = std::function<std::pair<std::string, std::string>()>;
+
HTTPD();
+ ~HTTPD();
// Should be called before start().
void set_header(const std::string &data) {
header = data;
}
+ // Should be called before start() (due to threading issues).
+ enum CORSPolicy {
+ NO_CORS_POLICY,
+ ALLOW_ALL_ORIGINS
+ };
+ void add_endpoint(const std::string &url, const EndpointCallback &callback, CORSPolicy cors_policy) {
+ endpoints[url] = Endpoint{ callback, cors_policy };
+ }
+
void start(int port);
void add_data(const char *buf, size_t size, bool keyframe);
+ int64_t get_num_connected_clients() const {
+ return metric_num_connected_clients.load();
+ }
private:
static int answer_to_connection_thunk(void *cls, MHD_Connection *connection,
static void free_stream(void *cls);
- static void request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
-
- void request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe);
-
class Stream {
public:
FRAMING_RAW,
FRAMING_METACUBE
};
- Stream(Framing framing) : framing(framing) {}
+ Stream(HTTPD *parent, Framing framing) : parent(parent), framing(framing) {}
static ssize_t reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max);
ssize_t reader_callback(uint64_t pos, char *buf, size_t max);
DATA_TYPE_OTHER
};
void add_data(const char *buf, size_t size, DataType data_type);
+ void stop();
+ HTTPD *get_parent() const { return parent; }
private:
+ HTTPD *parent;
Framing framing;
std::mutex buffer_mutex;
+ bool should_quit = false; // Under <buffer_mutex>.
std::condition_variable has_buffered_data;
- std::deque<std::string> buffered_data; // Protected by <mutex>.
+ std::deque<std::string> buffered_data; // Protected by <buffer_mutex>.
size_t used_of_buffered_data = 0; // How many bytes of the first element of <buffered_data> that is already used. Protected by <mutex>.
size_t seen_keyframe = false;
};
+ MHD_Daemon *mhd = nullptr;
std::mutex streams_mutex;
std::set<Stream *> streams; // Not owned.
+ struct Endpoint {
+ EndpointCallback callback;
+ CORSPolicy cors_policy;
+ };
+ std::unordered_map<std::string, Endpoint> endpoints;
std::string header;
+
+ // Metrics.
+ std::atomic<int64_t> metric_num_connected_clients{0};
};
#endif // !defined(_HTTPD_H)