6 #include <microhttpd.h>
7 #include <netinet/in.h>
15 #include "metacube2.h"
18 struct MHD_Connection;
25 global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
31 MHD_quiesce_daemon(mhd);
32 for (Stream *stream : streams) {
39 void HTTPD::start(int port)
41 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
44 &answer_to_connection_thunk, this,
45 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
48 fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
52 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
54 unique_lock<mutex> lock(streams_mutex);
55 for (Stream *stream : streams) {
56 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
60 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
61 const char *url, const char *method,
62 const char *version, const char *upload_data,
63 size_t *upload_data_size, void **con_cls)
65 HTTPD *httpd = (HTTPD *)cls;
66 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
69 int HTTPD::answer_to_connection(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 // See if the URL ends in “.metacube”.
75 HTTPD::Stream::Framing framing;
76 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
77 framing = HTTPD::Stream::FRAMING_METACUBE;
79 framing = HTTPD::Stream::FRAMING_RAW;
82 if (strcmp(url, "/metrics") == 0) {
83 string contents = global_metrics.serialize();
84 MHD_Response *response = MHD_create_response_from_buffer(
85 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
86 MHD_add_response_header(response, "Content-type", "text/plain");
87 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
88 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
91 if (endpoints.count(url)) {
92 pair<string, string> contents_and_type = endpoints[url].callback();
93 MHD_Response *response = MHD_create_response_from_buffer(
94 contents_and_type.first.size(), &contents_and_type.first[0], MHD_RESPMEM_MUST_COPY);
95 MHD_add_response_header(response, "Content-type", contents_and_type.second.c_str());
96 if (endpoints[url].cors_policy == ALLOW_ALL_ORIGINS) {
97 MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
99 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
100 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
104 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
105 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
107 unique_lock<mutex> lock(streams_mutex);
108 streams.insert(stream);
110 ++metric_num_connected_clients;
113 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
114 MHD_Response *response = MHD_create_response_from_callback(
115 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
116 // TODO: Content-type?
117 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
118 MHD_add_response_header(response, "Content-encoding", "metacube");
121 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
122 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
127 void HTTPD::free_stream(void *cls)
129 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
130 HTTPD *httpd = stream->get_parent();
132 unique_lock<mutex> lock(httpd->streams_mutex);
134 httpd->streams.erase(stream);
136 --httpd->metric_num_connected_clients;
139 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
141 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
142 return stream->reader_callback(pos, buf, max);
145 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
147 unique_lock<mutex> lock(buffer_mutex);
148 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
154 while (max > 0 && !buffered_data.empty()) {
155 const string &s = buffered_data.front();
156 assert(s.size() > used_of_buffered_data);
157 size_t len = s.size() - used_of_buffered_data;
159 // Consume the entire (rest of the) string.
160 memcpy(buf, s.data() + used_of_buffered_data, len);
164 buffered_data.pop_front();
165 used_of_buffered_data = 0;
167 // We don't need the entire string; just use the first part of it.
168 memcpy(buf, s.data() + used_of_buffered_data, max);
170 used_of_buffered_data += max;
179 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
184 if (data_type == DATA_TYPE_KEYFRAME) {
185 seen_keyframe = true;
186 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
187 // Start sending only once we see a keyframe.
191 unique_lock<mutex> lock(buffer_mutex);
193 if (framing == FRAMING_METACUBE) {
194 metacube2_block_header hdr;
195 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
196 hdr.size = htonl(buf_size);
198 if (data_type == DATA_TYPE_HEADER) {
199 flags |= METACUBE_FLAGS_HEADER;
200 } else if (data_type == DATA_TYPE_OTHER) {
201 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
203 hdr.flags = htons(flags);
204 hdr.csum = htons(metacube2_compute_crc(&hdr));
205 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
207 buffered_data.emplace_back(buf, buf_size);
209 // Send a Metacube2 timestamp every keyframe.
210 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
212 clock_gettime(CLOCK_REALTIME, &now);
214 metacube2_timestamp_packet packet;
215 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
216 packet.tv_sec = htobe64(now.tv_sec);
217 packet.tv_nsec = htobe64(now.tv_nsec);
219 metacube2_block_header hdr;
220 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
221 hdr.size = htonl(sizeof(packet));
222 hdr.flags = htons(METACUBE_FLAGS_METADATA);
223 hdr.csum = htons(metacube2_compute_crc(&hdr));
224 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
225 buffered_data.emplace_back((char *)&packet, sizeof(packet));
228 has_buffered_data.notify_all();
231 void HTTPD::Stream::stop()
233 unique_lock<mutex> lock(buffer_mutex);
235 has_buffered_data.notify_all();