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 // Small hack; reject unknown /channels/foo.
105 if (string(url).find("/channels/") == 0) {
106 string contents = "Not found.";
107 MHD_Response *response = MHD_create_response_from_buffer(
108 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
109 MHD_add_response_header(response, "Content-type", "text/plain");
110 int ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
111 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
115 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
116 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
118 unique_lock<mutex> lock(streams_mutex);
119 streams.insert(stream);
121 ++metric_num_connected_clients;
124 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
125 MHD_Response *response = MHD_create_response_from_callback(
126 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
127 // TODO: Content-type?
128 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
129 MHD_add_response_header(response, "Content-encoding", "metacube");
132 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
133 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
138 void HTTPD::free_stream(void *cls)
140 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
141 HTTPD *httpd = stream->get_parent();
143 unique_lock<mutex> lock(httpd->streams_mutex);
145 httpd->streams.erase(stream);
147 --httpd->metric_num_connected_clients;
150 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
152 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
153 return stream->reader_callback(pos, buf, max);
156 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
158 unique_lock<mutex> lock(buffer_mutex);
159 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
165 while (max > 0 && !buffered_data.empty()) {
166 const string &s = buffered_data.front();
167 assert(s.size() > used_of_buffered_data);
168 size_t len = s.size() - used_of_buffered_data;
170 // Consume the entire (rest of the) string.
171 memcpy(buf, s.data() + used_of_buffered_data, len);
175 buffered_data.pop_front();
176 used_of_buffered_data = 0;
178 // We don't need the entire string; just use the first part of it.
179 memcpy(buf, s.data() + used_of_buffered_data, max);
181 used_of_buffered_data += max;
190 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
195 if (data_type == DATA_TYPE_KEYFRAME) {
196 seen_keyframe = true;
197 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
198 // Start sending only once we see a keyframe.
202 unique_lock<mutex> lock(buffer_mutex);
204 if (framing == FRAMING_METACUBE) {
205 metacube2_block_header hdr;
206 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
207 hdr.size = htonl(buf_size);
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;
214 hdr.flags = htons(flags);
215 hdr.csum = htons(metacube2_compute_crc(&hdr));
216 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
218 buffered_data.emplace_back(buf, buf_size);
220 // Send a Metacube2 timestamp every keyframe.
221 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
223 clock_gettime(CLOCK_REALTIME, &now);
225 metacube2_timestamp_packet packet;
226 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
227 packet.tv_sec = htobe64(now.tv_sec);
228 packet.tv_nsec = htobe64(now.tv_nsec);
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 has_buffered_data.notify_all();
242 void HTTPD::Stream::stop()
244 unique_lock<mutex> lock(buffer_mutex);
246 has_buffered_data.notify_all();