4 #include <microhttpd.h>
15 #include "metacube2.h"
18 struct MHD_Connection;
29 MHD_quiesce_daemon(mhd);
30 for (Stream *stream : streams) {
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,
46 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
48 unique_lock<mutex> lock(streams_mutex);
49 for (Stream *stream : streams) {
50 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
54 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
55 const char *url, const char *method,
56 const char *version, const char *upload_data,
57 size_t *upload_data_size, void **con_cls)
59 HTTPD *httpd = (HTTPD *)cls;
60 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
63 int HTTPD::answer_to_connection(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 // See if the URL ends in “.metacube”.
69 HTTPD::Stream::Framing framing;
70 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
71 framing = HTTPD::Stream::FRAMING_METACUBE;
73 framing = HTTPD::Stream::FRAMING_RAW;
76 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
77 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
79 unique_lock<mutex> lock(streams_mutex);
80 streams.insert(stream);
84 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
85 MHD_Response *response = MHD_create_response_from_callback(
86 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
88 // TODO: Content-type?
89 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
90 MHD_add_response_header(response, "Content-encoding", "metacube");
92 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
93 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
98 void HTTPD::free_stream(void *cls)
100 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
101 HTTPD *httpd = stream->get_parent();
103 unique_lock<mutex> lock(httpd->streams_mutex);
105 httpd->streams.erase(stream);
109 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
111 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
112 return stream->reader_callback(pos, buf, max);
115 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
117 unique_lock<mutex> lock(buffer_mutex);
118 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
124 while (max > 0 && !buffered_data.empty()) {
125 const string &s = buffered_data.front();
126 assert(s.size() > used_of_buffered_data);
127 size_t len = s.size() - used_of_buffered_data;
129 // Consume the entire (rest of the) string.
130 memcpy(buf, s.data() + used_of_buffered_data, len);
134 buffered_data.pop_front();
135 used_of_buffered_data = 0;
137 // We don't need the entire string; just use the first part of it.
138 memcpy(buf, s.data() + used_of_buffered_data, max);
140 used_of_buffered_data += max;
149 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
154 if (data_type == DATA_TYPE_KEYFRAME) {
155 seen_keyframe = true;
156 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
157 // Start sending only once we see a keyframe.
161 unique_lock<mutex> lock(buffer_mutex);
163 if (framing == FRAMING_METACUBE) {
164 metacube2_block_header hdr;
165 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
166 hdr.size = htonl(buf_size);
168 if (data_type == DATA_TYPE_HEADER) {
169 flags |= METACUBE_FLAGS_HEADER;
170 } else if (data_type == DATA_TYPE_OTHER) {
171 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
173 hdr.flags = htons(flags);
174 hdr.csum = htons(metacube2_compute_crc(&hdr));
175 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
177 buffered_data.emplace_back(buf, buf_size);
179 // Send a Metacube2 timestamp every keyframe.
180 if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
182 clock_gettime(CLOCK_REALTIME, &now);
184 metacube2_timestamp_packet packet;
185 packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
186 packet.tv_sec = htobe64(now.tv_sec);
187 packet.tv_nsec = htobe64(now.tv_nsec);
189 metacube2_block_header hdr;
190 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
191 hdr.size = htonl(sizeof(packet));
192 hdr.flags = htons(METACUBE_FLAGS_METADATA);
193 hdr.csum = htons(metacube2_compute_crc(&hdr));
194 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
195 buffered_data.emplace_back((char *)&packet, sizeof(packet));
198 has_buffered_data.notify_all();
201 void HTTPD::Stream::stop()
203 unique_lock<mutex> lock(buffer_mutex);
205 has_buffered_data.notify_all();