6 #include <microhttpd.h>
7 #include <netinet/in.h>
14 #include <libavutil/avutil.h>
18 #include "shared/metacube2.h"
19 #include "shared/metrics.h"
21 struct MHD_Connection;
28 global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
36 void HTTPD::start(int port)
38 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
41 &answer_to_connection_thunk, this,
42 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
45 fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
52 MHD_quiesce_daemon(mhd);
53 for (Stream *stream : streams) {
61 void HTTPD::add_data(const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase)
63 unique_lock<mutex> lock(streams_mutex);
64 for (Stream *stream : streams) {
65 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER, time, timebase);
69 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
70 const char *url, const char *method,
71 const char *version, const char *upload_data,
72 size_t *upload_data_size, void **con_cls)
74 HTTPD *httpd = (HTTPD *)cls;
75 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
78 int HTTPD::answer_to_connection(MHD_Connection *connection,
79 const char *url, const char *method,
80 const char *version, const char *upload_data,
81 size_t *upload_data_size, void **con_cls)
83 // See if the URL ends in “.metacube”.
84 HTTPD::Stream::Framing framing;
85 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
86 framing = HTTPD::Stream::FRAMING_METACUBE;
88 framing = HTTPD::Stream::FRAMING_RAW;
91 if (strcmp(url, "/metrics") == 0) {
92 string contents = global_metrics.serialize();
93 MHD_Response *response = MHD_create_response_from_buffer(
94 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
95 MHD_add_response_header(response, "Content-type", "text/plain");
96 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
97 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
100 if (endpoints.count(url)) {
101 pair<string, string> contents_and_type = endpoints[url].callback();
102 MHD_Response *response = MHD_create_response_from_buffer(
103 contents_and_type.first.size(), &contents_and_type.first[0], MHD_RESPMEM_MUST_COPY);
104 MHD_add_response_header(response, "Content-type", contents_and_type.second.c_str());
105 if (endpoints[url].cors_policy == ALLOW_ALL_ORIGINS) {
106 MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
108 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
109 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
113 // Small hack; reject unknown /channels/foo.
114 if (string(url).find("/channels/") == 0) {
115 string contents = "Not found.";
116 MHD_Response *response = MHD_create_response_from_buffer(
117 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
118 MHD_add_response_header(response, "Content-type", "text/plain");
119 int ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
120 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
124 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
125 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER, AV_NOPTS_VALUE, AVRational{ 1, 0 });
127 unique_lock<mutex> lock(streams_mutex);
128 streams.insert(stream);
130 ++metric_num_connected_clients;
133 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
134 MHD_Response *response = MHD_create_response_from_callback(
135 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
136 // TODO: Content-type?
137 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
138 MHD_add_response_header(response, "Content-encoding", "metacube");
141 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
142 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
147 void HTTPD::free_stream(void *cls)
149 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
150 HTTPD *httpd = stream->get_parent();
152 unique_lock<mutex> lock(httpd->streams_mutex);
154 httpd->streams.erase(stream);
156 --httpd->metric_num_connected_clients;
159 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
161 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
162 return stream->reader_callback(pos, buf, max);
165 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
167 unique_lock<mutex> lock(buffer_mutex);
168 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
174 while (max > 0 && !buffered_data.empty()) {
175 const string &s = buffered_data.front();
176 assert(s.size() > used_of_buffered_data);
177 size_t len = s.size() - used_of_buffered_data;
179 // Consume the entire (rest of the) string.
180 memcpy(buf, s.data() + used_of_buffered_data, len);
184 buffered_data.pop_front();
185 used_of_buffered_data = 0;
187 // We don't need the entire string; just use the first part of it.
188 memcpy(buf, s.data() + used_of_buffered_data, max);
190 used_of_buffered_data += max;
199 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type, int64_t time, AVRational timebase)
204 if (data_type == DATA_TYPE_KEYFRAME) {
205 seen_keyframe = true;
206 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
207 // Start sending only once we see a keyframe.
211 unique_lock<mutex> lock(buffer_mutex);
213 if (framing == FRAMING_METACUBE) {
215 if (data_type == DATA_TYPE_HEADER) {
216 flags |= METACUBE_FLAGS_HEADER;
217 } else if (data_type == DATA_TYPE_OTHER) {
218 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
221 // If we're about to send a keyframe, send a pts metadata block
223 if ((flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) == 0 && time != AV_NOPTS_VALUE) {
224 metacube2_pts_packet packet;
225 packet.type = htobe64(METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS);
226 packet.pts = htobe64(time);
227 packet.timebase_num = htobe64(timebase.num);
228 packet.timebase_den = htobe64(timebase.den);
230 metacube2_block_header hdr;
231 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
232 hdr.size = htonl(sizeof(packet));
233 hdr.flags = htons(METACUBE_FLAGS_METADATA);
234 hdr.csum = htons(metacube2_compute_crc(&hdr));
235 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
236 buffered_data.emplace_back((char *)&packet, sizeof(packet));
239 metacube2_block_header hdr;
240 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
241 hdr.size = htonl(buf_size);
242 hdr.flags = htons(flags);
243 hdr.csum = htons(metacube2_compute_crc(&hdr));
244 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
246 buffered_data.emplace_back(buf, buf_size);
248 // Send a Metacube2 timestamp every keyframe.
249 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
251 clock_gettime(CLOCK_REALTIME, &now);
253 metacube2_timestamp_packet packet;
254 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
255 packet.tv_sec = htobe64(now.tv_sec);
256 packet.tv_nsec = htobe64(now.tv_nsec);
258 metacube2_block_header hdr;
259 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
260 hdr.size = htonl(sizeof(packet));
261 hdr.flags = htons(METACUBE_FLAGS_METADATA);
262 hdr.csum = htons(metacube2_compute_crc(&hdr));
263 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
264 buffered_data.emplace_back((char *)&packet, sizeof(packet));
267 has_buffered_data.notify_all();
270 void HTTPD::Stream::stop()
272 unique_lock<mutex> lock(buffer_mutex);
274 has_buffered_data.notify_all();