6 #include <microhttpd.h>
7 #include <netinet/in.h>
14 #include <libavutil/avutil.h>
18 #include "metacube2.h"
21 struct MHD_Connection;
28 global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
34 MHD_quiesce_daemon(mhd);
35 for (Stream *stream : streams) {
42 void HTTPD::start(int port)
44 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
47 &answer_to_connection_thunk, this,
48 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
51 fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
55 void HTTPD::add_data(const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase)
57 unique_lock<mutex> lock(streams_mutex);
58 for (Stream *stream : streams) {
59 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER, time, timebase);
63 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
64 const char *url, const char *method,
65 const char *version, const char *upload_data,
66 size_t *upload_data_size, void **con_cls)
68 HTTPD *httpd = (HTTPD *)cls;
69 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
72 int HTTPD::answer_to_connection(MHD_Connection *connection,
73 const char *url, const char *method,
74 const char *version, const char *upload_data,
75 size_t *upload_data_size, void **con_cls)
77 // See if the URL ends in “.metacube”.
78 HTTPD::Stream::Framing framing;
79 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
80 framing = HTTPD::Stream::FRAMING_METACUBE;
82 framing = HTTPD::Stream::FRAMING_RAW;
85 if (strcmp(url, "/metrics") == 0) {
86 string contents = global_metrics.serialize();
87 MHD_Response *response = MHD_create_response_from_buffer(
88 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
89 MHD_add_response_header(response, "Content-type", "text/plain");
90 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
91 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
94 if (endpoints.count(url)) {
95 pair<string, string> contents_and_type = endpoints[url].callback();
96 MHD_Response *response = MHD_create_response_from_buffer(
97 contents_and_type.first.size(), &contents_and_type.first[0], MHD_RESPMEM_MUST_COPY);
98 MHD_add_response_header(response, "Content-type", contents_and_type.second.c_str());
99 if (endpoints[url].cors_policy == ALLOW_ALL_ORIGINS) {
100 MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
102 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
103 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
107 // Small hack; reject unknown /channels/foo.
108 if (string(url).find("/channels/") == 0) {
109 string contents = "Not found.";
110 MHD_Response *response = MHD_create_response_from_buffer(
111 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
112 MHD_add_response_header(response, "Content-type", "text/plain");
113 int ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
114 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
118 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
119 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER, AV_NOPTS_VALUE, AVRational{ 1, 0 });
121 unique_lock<mutex> lock(streams_mutex);
122 streams.insert(stream);
124 ++metric_num_connected_clients;
127 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
128 MHD_Response *response = MHD_create_response_from_callback(
129 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
130 // TODO: Content-type?
131 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
132 MHD_add_response_header(response, "Content-encoding", "metacube");
135 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
136 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
141 void HTTPD::free_stream(void *cls)
143 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
144 HTTPD *httpd = stream->get_parent();
146 unique_lock<mutex> lock(httpd->streams_mutex);
148 httpd->streams.erase(stream);
150 --httpd->metric_num_connected_clients;
153 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
155 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
156 return stream->reader_callback(pos, buf, max);
159 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
161 unique_lock<mutex> lock(buffer_mutex);
162 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
168 while (max > 0 && !buffered_data.empty()) {
169 const string &s = buffered_data.front();
170 assert(s.size() > used_of_buffered_data);
171 size_t len = s.size() - used_of_buffered_data;
173 // Consume the entire (rest of the) string.
174 memcpy(buf, s.data() + used_of_buffered_data, len);
178 buffered_data.pop_front();
179 used_of_buffered_data = 0;
181 // We don't need the entire string; just use the first part of it.
182 memcpy(buf, s.data() + used_of_buffered_data, max);
184 used_of_buffered_data += max;
193 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type, int64_t time, AVRational timebase)
198 if (data_type == DATA_TYPE_KEYFRAME) {
199 seen_keyframe = true;
200 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
201 // Start sending only once we see a keyframe.
205 unique_lock<mutex> lock(buffer_mutex);
207 if (framing == FRAMING_METACUBE) {
209 if (data_type == DATA_TYPE_HEADER) {
210 flags |= METACUBE_FLAGS_HEADER;
211 } else if (data_type == DATA_TYPE_OTHER) {
212 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
215 // If we're about to send a keyframe, send a pts metadata block
217 if ((flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) == 0 && time != AV_NOPTS_VALUE) {
218 metacube2_pts_packet packet;
219 packet.type = htobe64(METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS);
220 packet.pts = htobe64(time);
221 packet.timebase_num = htobe64(timebase.num);
222 packet.timebase_den = htobe64(timebase.den);
224 metacube2_block_header hdr;
225 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
226 hdr.size = htonl(sizeof(packet));
227 hdr.flags = htons(METACUBE_FLAGS_METADATA);
228 hdr.csum = htons(metacube2_compute_crc(&hdr));
229 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
230 buffered_data.emplace_back((char *)&packet, sizeof(packet));
233 metacube2_block_header hdr;
234 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
235 hdr.size = htonl(buf_size);
236 hdr.flags = htons(flags);
237 hdr.csum = htons(metacube2_compute_crc(&hdr));
238 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
240 buffered_data.emplace_back(buf, buf_size);
242 // Send a Metacube2 timestamp every keyframe.
243 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
245 clock_gettime(CLOCK_REALTIME, &now);
247 metacube2_timestamp_packet packet;
248 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
249 packet.tv_sec = htobe64(now.tv_sec);
250 packet.tv_nsec = htobe64(now.tv_nsec);
252 metacube2_block_header hdr;
253 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
254 hdr.size = htonl(sizeof(packet));
255 hdr.flags = htons(METACUBE_FLAGS_METADATA);
256 hdr.csum = htons(metacube2_compute_crc(&hdr));
257 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
258 buffered_data.emplace_back((char *)&packet, sizeof(packet));
261 has_buffered_data.notify_all();
264 void HTTPD::Stream::stop()
266 unique_lock<mutex> lock(buffer_mutex);
268 has_buffered_data.notify_all();