Fix an issue where the mixer lagging too much behind CEF would cause us to display...

[nageru] / httpd.cpp

diff --git a/httpd.cpp b/httpd.cpp
index c6a233deae66f6dca2eecc5476ec275a5928ca98..fe2c929969de53db70e179a5f5200db201732631 100644 (file)
--- a/httpd.cpp
+++ b/httpd.cpp
@@ -1,18 +1,19 @@
-#include <arpa/inet.h>
+#include "httpd.h"
+
 #include <assert.h>
+#include <byteswap.h>
+#include <endian.h>
 #include <microhttpd.h>
+#include <netinet/in.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
-
-#include <vector>
-
-#include "httpd.h"
+#include <sys/time.h>
+#include <time.h>
+#include <memory>
 
 #include "defs.h"
-#include "flags.h"
 #include "metacube2.h"
-#include "timebase.h"
+#include "metrics.h"
 
 struct MHD_Connection;
 struct MHD_Response;
@@ -21,15 +22,18 @@ using namespace std;
 
 HTTPD::HTTPD()
 {
+       global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
 }
 
 HTTPD::~HTTPD()
 {
-       MHD_quiesce_daemon(mhd);
-       for (Stream *stream : streams) {
-               stream->stop();
+       if (mhd) {
+               MHD_quiesce_daemon(mhd);
+               for (Stream *stream : streams) {
+                       stream->stop();
+               }
+               MHD_stop_daemon(mhd);
        }
-       MHD_stop_daemon(mhd);
 }
 
 void HTTPD::start(int port)
@@ -40,6 +44,9 @@ void HTTPD::start(int port)
                               &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::add_data(const char *buf, size_t size, bool keyframe)
@@ -72,22 +79,45 @@ int HTTPD::answer_to_connection(MHD_Connection *connection,
                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;
+       }
+
        HTTPD::Stream *stream = new HTTPD::Stream(this, framing);
        stream->add_data(header.data(), header.size(), Stream::DATA_TYPE_HEADER);
        {
                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.
 
@@ -103,6 +133,7 @@ void HTTPD::free_stream(void *cls)
                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)
@@ -174,6 +205,26 @@ void HTTPD::Stream::add_data(const char *buf, size_t buf_size, HTTPD::Stream::Da
                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(); 
 }