3 #include <microhttpd.h>
14 #include "metacube2.h"
17 struct MHD_Connection;
28 MHD_quiesce_daemon(mhd);
29 for (Stream *stream : streams) {
35 void HTTPD::start(int port)
37 mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
40 &answer_to_connection_thunk, this,
41 MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
45 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
47 unique_lock<mutex> lock(streams_mutex);
48 for (Stream *stream : streams) {
49 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
53 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
54 const char *url, const char *method,
55 const char *version, const char *upload_data,
56 size_t *upload_data_size, void **con_cls)
58 HTTPD *httpd = (HTTPD *)cls;
59 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
62 int HTTPD::answer_to_connection(MHD_Connection *connection,
63 const char *url, const char *method,
64 const char *version, const char *upload_data,
65 size_t *upload_data_size, void **con_cls)
67 // See if the URL ends in “.metacube”.
68 HTTPD::Stream::Framing framing;
69 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
70 framing = HTTPD::Stream::FRAMING_METACUBE;
72 framing = HTTPD::Stream::FRAMING_RAW;
75 HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
76 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
78 unique_lock<mutex> lock(streams_mutex);
79 streams.insert(stream);
83 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
84 MHD_Response *response = MHD_create_response_from_callback(
85 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
87 // TODO: Content-type?
88 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
89 MHD_add_response_header(response, "Content-encoding", "metacube");
91 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
92 MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
97 void HTTPD::free_stream(void *cls)
99 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
100 HTTPD *httpd = stream->get_parent();
102 unique_lock<mutex> lock(httpd->streams_mutex);
104 httpd->streams.erase(stream);
108 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
110 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
111 return stream->reader_callback(pos, buf, max);
114 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
116 unique_lock<mutex> lock(buffer_mutex);
117 has_buffered_data.wait(lock, [this]{ return should_quit || !buffered_data.empty(); });
123 while (max > 0 && !buffered_data.empty()) {
124 const string &s = buffered_data.front();
125 assert(s.size() > used_of_buffered_data);
126 size_t len = s.size() - used_of_buffered_data;
128 // Consume the entire (rest of the) string.
129 memcpy(buf, s.data() + used_of_buffered_data, len);
133 buffered_data.pop_front();
134 used_of_buffered_data = 0;
136 // We don't need the entire string; just use the first part of it.
137 memcpy(buf, s.data() + used_of_buffered_data, max);
139 used_of_buffered_data += max;
148 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
153 if (data_type == DATA_TYPE_KEYFRAME) {
154 seen_keyframe = true;
155 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
156 // Start sending only once we see a keyframe.
160 unique_lock<mutex> lock(buffer_mutex);
162 if (framing == FRAMING_METACUBE) {
163 metacube2_block_header hdr;
164 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
165 hdr.size = htonl(buf_size);
167 if (data_type == DATA_TYPE_HEADER) {
168 flags |= METACUBE_FLAGS_HEADER;
169 } else if (data_type == DATA_TYPE_OTHER) {
170 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
172 hdr.flags = htons(flags);
173 hdr.csum = htons(metacube2_compute_crc(&hdr));
174 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
176 buffered_data.emplace_back(buf, buf_size);
177 has_buffered_data.notify_all();
180 void HTTPD::Stream::stop()
182 unique_lock<mutex> lock(buffer_mutex);
184 has_buffered_data.notify_all();