3 #include <microhttpd.h>
14 #include "metacube2.h"
17 struct MHD_Connection;
26 void HTTPD::start(int port)
28 MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
31 &answer_to_connection_thunk, this,
32 MHD_OPTION_NOTIFY_COMPLETED, &request_completed_thunk, this,
36 void HTTPD::add_data(const char *buf, size_t size, bool keyframe)
38 unique_lock<mutex> lock(streams_mutex);
39 for (Stream *stream : streams) {
40 stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER);
44 int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
45 const char *url, const char *method,
46 const char *version, const char *upload_data,
47 size_t *upload_data_size, void **con_cls)
49 HTTPD *httpd = (HTTPD *)cls;
50 return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
53 int HTTPD::answer_to_connection(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 // See if the URL ends in “.metacube”.
59 HTTPD::Stream::Framing framing;
60 if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
61 framing = HTTPD::Stream::FRAMING_METACUBE;
63 framing = HTTPD::Stream::FRAMING_RAW;
66 HTTPD::Stream *stream = new HTTPD::Stream(framing);
67 stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
69 unique_lock<mutex> lock(streams_mutex);
70 streams.insert(stream);
74 // Does not strictly have to be equal to MUX_BUFFER_SIZE.
75 MHD_Response *response = MHD_create_response_from_callback(
76 (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
78 // TODO: Content-type?
79 if (framing == HTTPD::Stream::FRAMING_METACUBE) {
80 MHD_add_response_header(response, "Content-encoding", "metacube");
82 int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
83 //MHD_destroy_response(response);
88 void HTTPD::free_stream(void *cls)
90 // FIXME: When is this actually called, if ever?
91 // Also, shouldn't we remove it from streams?
92 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
96 void HTTPD::request_completed_thunk(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
98 HTTPD *httpd = (HTTPD *)cls;
99 return httpd->request_completed(connection, con_cls, toe);
102 void HTTPD::request_completed(struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
104 if (con_cls == nullptr) {
105 // Request was never set up.
108 HTTPD::Stream *stream = (HTTPD::Stream *)*con_cls;
110 unique_lock<mutex> lock(streams_mutex);
112 streams.erase(stream);
116 ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
118 HTTPD::Stream *stream = (HTTPD::Stream *)cls;
119 return stream->reader_callback(pos, buf, max);
122 ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
124 unique_lock<mutex> lock(buffer_mutex);
125 has_buffered_data.wait(lock, [this]{ return !buffered_data.empty(); });
128 while (max > 0 && !buffered_data.empty()) {
129 const string &s = buffered_data.front();
130 assert(s.size() > used_of_buffered_data);
131 size_t len = s.size() - used_of_buffered_data;
133 // Consume the entire (rest of the) string.
134 memcpy(buf, s.data() + used_of_buffered_data, len);
138 buffered_data.pop_front();
139 used_of_buffered_data = 0;
141 // We don't need the entire string; just use the first part of it.
142 memcpy(buf, s.data() + used_of_buffered_data, max);
144 used_of_buffered_data += max;
153 void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type)
158 if (data_type == DATA_TYPE_KEYFRAME) {
159 seen_keyframe = true;
160 } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
161 // Start sending only once we see a keyframe.
165 unique_lock<mutex> lock(buffer_mutex);
167 if (framing == FRAMING_METACUBE) {
168 metacube2_block_header hdr;
169 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
170 hdr.size = htonl(buf_size);
172 if (data_type == DATA_TYPE_HEADER) {
173 flags |= METACUBE_FLAGS_HEADER;
174 } else if (data_type == DATA_TYPE_OTHER) {
175 flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
177 hdr.flags = htons(flags);
178 hdr.csum = htons(metacube2_compute_crc(&hdr));
179 buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
181 buffered_data.emplace_back(buf, buf_size);
182 has_buffered_data.notify_all();