--- /dev/null
+#include "shared/httpd.h"
+
+#include <assert.h>
+#include <byteswap.h>
+#include <endian.h>
+#include <memory>
+#include <microhttpd.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+extern "C" {
+#include <libavutil/avutil.h>
+}
+
+#include "shared/shared_defs.h"
+#include "shared/metacube2.h"
+#include "shared/metrics.h"
+
+struct MHD_Connection;
+struct MHD_Response;
+
+using namespace std;
+
+HTTPD::HTTPD()
+{
+ global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
+}
+
+HTTPD::~HTTPD()
+{
+ stop();
+}
+
+void HTTPD::start(int port)
+{
+ mhd = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_POLL_INTERNALLY | MHD_USE_DUAL_STACK,
+ port,
+ nullptr, nullptr,
+ &answer_to_connection_thunk, this,
+ MHD_OPTION_NOTIFY_COMPLETED, nullptr, this,
+ MHD_OPTION_END);
+ if (mhd == nullptr) {
+ fprintf(stderr, "Warning: Could not open HTTP server. (Port already in use?)\n");
+ }
+}
+
+void HTTPD::stop()
+{
+ if (mhd) {
+ MHD_quiesce_daemon(mhd);
+ for (Stream *stream : streams) {
+ stream->stop();
+ }
+ MHD_stop_daemon(mhd);
+ mhd = nullptr;
+ }
+}
+
+void HTTPD::add_data(const char *buf, size_t size, bool keyframe, int64_t time, AVRational timebase)
+{
+ unique_lock<mutex> lock(streams_mutex);
+ for (Stream *stream : streams) {
+ stream->add_data(buf, size, keyframe ? Stream::DATA_TYPE_KEYFRAME : Stream::DATA_TYPE_OTHER, time, timebase);
+ }
+}
+
+int HTTPD::answer_to_connection_thunk(void *cls, MHD_Connection *connection,
+ const char *url, const char *method,
+ const char *version, const char *upload_data,
+ size_t *upload_data_size, void **con_cls)
+{
+ HTTPD *httpd = (HTTPD *)cls;
+ return httpd->answer_to_connection(connection, url, method, version, upload_data, upload_data_size, con_cls);
+}
+
+int HTTPD::answer_to_connection(MHD_Connection *connection,
+ const char *url, const char *method,
+ const char *version, const char *upload_data,
+ size_t *upload_data_size, void **con_cls)
+{
+ // See if the URL ends in “.metacube”.
+ HTTPD::Stream::Framing framing;
+ if (strstr(url, ".metacube") == url + strlen(url) - strlen(".metacube")) {
+ framing = HTTPD::Stream::FRAMING_METACUBE;
+ } else {
+ framing = HTTPD::Stream::FRAMING_RAW;
+ }
+
+ if (strcmp(url, "/metrics") == 0) {
+ string contents = global_metrics.serialize();
+ MHD_Response *response = MHD_create_response_from_buffer(
+ contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
+ MHD_add_response_header(response, "Content-type", "text/plain");
+ int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
+ MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
+ return ret;
+ }
+ if (endpoints.count(url)) {
+ pair<string, string> contents_and_type = endpoints[url].callback();
+ MHD_Response *response = MHD_create_response_from_buffer(
+ contents_and_type.first.size(), &contents_and_type.first[0], MHD_RESPMEM_MUST_COPY);
+ MHD_add_response_header(response, "Content-type", contents_and_type.second.c_str());
+ if (endpoints[url].cors_policy == ALLOW_ALL_ORIGINS) {
+ MHD_add_response_header(response, "Access-Control-Allow-Origin", "*");
+ }
+ int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
+ MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
+ return ret;
+ }
+
+ // Small hack; reject unknown /channels/foo.
+ if (string(url).find("/channels/") == 0) {
+ string contents = "Not found.";
+ MHD_Response *response = MHD_create_response_from_buffer(
+ contents.size(), &contents[0], MHD_RESPMEM_MUST_COPY);
+ MHD_add_response_header(response, "Content-type", "text/plain");
+ int ret = MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, response);
+ MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
+ return ret;
+ }
+
+ HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
+ stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER, AV_NOPTS_VALUE, AVRational{ 1, 0 });
+ {
+ unique_lock<mutex> lock(streams_mutex);
+ streams.insert(stream);
+ }
+ ++metric_num_connected_clients;
+ *con_cls = stream;
+
+ // Does not strictly have to be equal to MUX_BUFFER_SIZE.
+ MHD_Response *response = MHD_create_response_from_callback(
+ (size_t)-1, MUX_BUFFER_SIZE, &HTTPD::Stream::reader_callback_thunk, stream, &HTTPD::free_stream);
+ // TODO: Content-type?
+ if (framing == HTTPD::Stream::FRAMING_METACUBE) {
+ MHD_add_response_header(response, "Content-encoding", "metacube");
+ }
+
+ int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
+ MHD_destroy_response(response); // Only decreases the refcount; actual free is after the request is done.
+
+ return ret;
+}
+
+void HTTPD::free_stream(void *cls)
+{
+ HTTPD::Stream *stream = (HTTPD::Stream *)cls;
+ HTTPD *httpd = stream->get_parent();
+ {
+ unique_lock<mutex> lock(httpd->streams_mutex);
+ delete stream;
+ httpd->streams.erase(stream);
+ }
+ --httpd->metric_num_connected_clients;
+}
+
+ssize_t HTTPD::Stream::reader_callback_thunk(void *cls, uint64_t pos, char *buf, size_t max)
+{
+ HTTPD::Stream *stream = (HTTPD::Stream *)cls;
+ return stream->reader_callback(pos, buf, max);
+}
+
+ssize_t HTTPD::Stream::reader_callback(uint64_t pos, char *buf, size_t max)
+{
+ unique_lock<mutex> lock(buffer_mutex);
+ has_buffered_data.wait(lock, [this] { return should_quit || !buffered_data.empty(); });
+ if (should_quit) {
+ return 0;
+ }
+
+ ssize_t ret = 0;
+ while (max > 0 && !buffered_data.empty()) {
+ const string &s = buffered_data.front();
+ assert(s.size() > used_of_buffered_data);
+ size_t len = s.size() - used_of_buffered_data;
+ if (max >= len) {
+ // Consume the entire (rest of the) string.
+ memcpy(buf, s.data() + used_of_buffered_data, len);
+ buf += len;
+ ret += len;
+ max -= len;
+ buffered_data.pop_front();
+ used_of_buffered_data = 0;
+ } else {
+ // We don't need the entire string; just use the first part of it.
+ memcpy(buf, s.data() + used_of_buffered_data, max);
+ buf += max;
+ used_of_buffered_data += max;
+ ret += max;
+ max = 0;
+ }
+ }
+
+ return ret;
+}
+
+void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::DataType data_type, int64_t time, AVRational timebase)
+{
+ if (buf_size == 0) {
+ return;
+ }
+ if (data_type == DATA_TYPE_KEYFRAME) {
+ seen_keyframe = true;
+ } else if (data_type == DATA_TYPE_OTHER && !seen_keyframe) {
+ // Start sending only once we see a keyframe.
+ return;
+ }
+
+ unique_lock<mutex> lock(buffer_mutex);
+
+ if (framing == FRAMING_METACUBE) {
+ int flags = 0;
+ if (data_type == DATA_TYPE_HEADER) {
+ flags |= METACUBE_FLAGS_HEADER;
+ } else if (data_type == DATA_TYPE_OTHER) {
+ flags |= METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START;
+ }
+
+ // If we're about to send a keyframe, send a pts metadata block
+ // to mark its time.
+ if ((flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) == 0 && time != AV_NOPTS_VALUE) {
+ metacube2_pts_packet packet;
+ packet.type = htobe64(METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS);
+ packet.pts = htobe64(time);
+ packet.timebase_num = htobe64(timebase.num);
+ packet.timebase_den = htobe64(timebase.den);
+
+ metacube2_block_header hdr;
+ memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(sizeof(packet));
+ hdr.flags = htons(METACUBE_FLAGS_METADATA);
+ hdr.csum = htons(metacube2_compute_crc(&hdr));
+ buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
+ buffered_data.emplace_back((char *)&packet, sizeof(packet));
+ }
+
+ metacube2_block_header hdr;
+ memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(buf_size);
+ hdr.flags = htons(flags);
+ hdr.csum = htons(metacube2_compute_crc(&hdr));
+ buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
+ }
+ buffered_data.emplace_back(buf, buf_size);
+
+ // Send a Metacube2 timestamp every keyframe.
+ if (framing == FRAMING_METACUBE && data_type == DATA_TYPE_KEYFRAME) {
+ timespec now;
+ clock_gettime(CLOCK_REALTIME, &now);
+
+ metacube2_timestamp_packet packet;
+ packet.type = htobe64(METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP);
+ packet.tv_sec = htobe64(now.tv_sec);
+ packet.tv_nsec = htobe64(now.tv_nsec);
+
+ metacube2_block_header hdr;
+ memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(sizeof(packet));
+ hdr.flags = htons(METACUBE_FLAGS_METADATA);
+ hdr.csum = htons(metacube2_compute_crc(&hdr));
+ buffered_data.emplace_back((char *)&hdr, sizeof(hdr));
+ buffered_data.emplace_back((char *)&packet, sizeof(packet));
+ }
+
+ has_buffered_data.notify_all();
+}
+
+void HTTPD::Stream::stop()
+{
+ unique_lock<mutex> lock(buffer_mutex);
+ should_quit = true;
+ has_buffered_data.notify_all();
+}
projects / nageru / blobdiff