X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=httpd.cpp;h=13d2a7138e3c362ab796e025f7e1fa867f7dde6c;hb=96cb6414f85e0ef4d660b7bd56267303e80fcd05;hp=858d9522c9354f1ea275cd0e859e5fef60d30636;hpb=cf7b9ee186d4ef8e5da0531b75854c97b821be44;p=nageru

diff --git a/httpd.cpp b/httpd.cpp
index 858d952..13d2a71 100644
--- a/httpd.cpp
+++ b/httpd.cpp
@@ -13,6 +13,7 @@
 
 #include "defs.h"
 #include "metacube2.h"
+#include "metrics.h"
 
 struct MHD_Connection;
 struct MHD_Response;
@@ -21,6 +22,7 @@ using namespace std;
 
 HTTPD::HTTPD()
 {
+	global_metrics.add("num_connected_clients", &metric_num_connected_clients, Metrics::TYPE_GAUGE);
 }
 
 HTTPD::~HTTPD()
@@ -77,22 +79,33 @@ 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;
+	}
+
 	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.
 
@@ -108,6 +121,7 @@ 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)