6 #include <microhttpd.h>
7 #include <netinet/in.h>
15 #include "metacube2.h"
18 struct MHD_Connection;
30 MHD_quiesce_daemon(mhd);
31 for (Stream *stream : streams) {
38 void HTTPD::start(int port)
40 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
43 &answer_to_connection_thunk, this,
44 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
47 fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
51 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
53 unique_lock<mutex> lock(streams_mutex);
54 for (Stream *stream : streams) {
55 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
59 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
60 const char *url, const char *method,
61 const char *version, const char *upload_data,
62 size_t *upload_data_size, void **con_cls)
64 HTTPD *httpd = (HTTPD *)cls;
65 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
68 int HTTPD::answer_to_connection(MHD_Connection *connection,
69 const char *url, const char *method,
70 const char *version, const char *upload_data,
71 size_t *upload_data_size, void **con_cls)
73 // See if the URL ends in “.metacube”.
74 HTTPD::Stream::Framing framing;
75 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
76 framing = HTTPD::Stream::FRAMING_METACUBE;
78 framing = HTTPD::Stream::FRAMING_RAW;
81 if (strcmp(url, "/metrics") == 0) {
82 string contents = global_metrics.serialize();
83 MHD_Response *response = MHD_create_response_from_buffer(
84 contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
85 MHD_add_response_header(response, "Content-type", "text/plain");
86 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
87 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
91 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
92 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
94 unique_lock<mutex> lock(streams_mutex);
95 streams.insert(stream);
99 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
100 MHD_Response *response = MHD_create_response_from_callback(
101 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
102 // TODO: Content-type?
103 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
104 MHD_add_response_header(response, "Content-encoding", "metacube");
107 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
108 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
113 void HTTPD::free_stream(void *cls)
115 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
116 HTTPD *httpd = stream->get_parent();
118 unique_lock<mutex> lock(httpd->streams_mutex);
120 httpd->streams.erase(stream);
124 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
126 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
127 return stream->reader_callback(pos, buf, max);
130 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
132 unique_lock<mutex> lock(buffer_mutex);
133 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
139 while (max > 0 && !buffered_data.empty()) {
140 const string &s = buffered_data.front();
141 assert(s.size() > used_of_buffered_data);
142 size_t len = s.size() - used_of_buffered_data;
144 // Consume the entire (rest of the) string.
145 memcpy(buf, s.data() + used_of_buffered_data, len);
149 buffered_data.pop_front();
150 used_of_buffered_data = 0;
152 // We don't need the entire string; just use the first part of it.
153 memcpy(buf, s.data() + used_of_buffered_data, max);
155 used_of_buffered_data += max;
164 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
169 if (data_type == DATA_TYPE_KEYFRAME) {
170 seen_keyframe = true;
171 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
172 // Start sending only once we see a keyframe.
176 unique_lock<mutex> lock(buffer_mutex);
178 if (framing == FRAMING_METACUBE) {
179 metacube2_block_header hdr;
180 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
181 hdr.size = htonl(buf_size);
183 if (data_type == DATA_TYPE_HEADER) {
184 flags |= METACUBE_FLAGS_HEADER;
185 } else if (data_type == DATA_TYPE_OTHER) {
186 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
188 hdr.flags = htons(flags);
189 hdr.csum = htons(metacube2_compute_crc(&hdr));
190 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
192 buffered_data.emplace_back(buf, buf_size);
194 // Send a Metacube2 timestamp every keyframe.
195 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
197 clock_gettime(CLOCK_REALTIME, &now);
199 metacube2_timestamp_packet packet;
200 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
201 packet.tv_sec = htobe64(now.tv_sec);
202 packet.tv_nsec = htobe64(now.tv_nsec);
204 metacube2_block_header hdr;
205 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
206 hdr.size = htonl(sizeof(packet));
207 hdr.flags = htons(METACUBE_FLAGS_METADATA);
208 hdr.csum = htons(metacube2_compute_crc(&hdr));
209 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
210 buffered_data.emplace_back((char *)&packet, sizeof(packet));
213 has_buffered_data.notify_all();
216 void HTTPD::Stream::stop()
218 unique_lock<mutex> lock(buffer_mutex);
220 has_buffered_data.notify_all();