[tarantool-patches] [PATCH] iproto: report active connections number

[Ilya Kosarev <i.kosarev@tarantool.org>]

Now there is new member in box.stat.net() called "CONNECTIONS" which is a number of active iproto connections.

Closes #3905
---
Branch: https://github.com/tarantool/tarantool/tree/i.kosarev/gh-3905-report-connections-number
Issue: https://github.com/tarantool/tarantool/issues/3905

 src/box/iproto.cc          | 7 ++++++-
 test/box/stat_net.result   | 8 ++++++++
 test/box/stat_net.test.lua | 2 ++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/box/iproto.cc b/src/box/iproto.cc
index a08c8c5cb..a20a7b005 100644
--- a/src/box/iproto.cc
+++ b/src/box/iproto.cc
@@ -267,10 +267,11 @@ struct rmean *rmean_net;
 enum rmean_net_name {
 	IPROTO_SENT,
 	IPROTO_RECEIVED,
+	IPROTO_CONNECTIONS,
 	IPROTO_LAST,
 };
 
-const char *rmean_net_strings[IPROTO_LAST] = { "SENT", "RECEIVED" };
+const char *rmean_net_strings[IPROTO_LAST] = { "SENT", "RECEIVED", "CONNECTIONS" };
 
 static void
 tx_process_destroy(struct cmsg *m);
@@ -579,6 +580,8 @@ iproto_connection_close(struct iproto_connection *con)
 		/* Make evio_has_fd() happy */
 		con->input.fd = con->output.fd = -1;
 		close(fd);
+		/* Count statistics */
+		rmean_collect(rmean_net, IPROTO_CONNECTIONS, -1);
 		/*
 		 * Discard unparsed data, to recycle the
 		 * connection in net_send_msg() as soon as all
@@ -1853,6 +1856,8 @@ iproto_on_accept(struct evio_service * /* service */, int fd,
 	struct iproto_connection *con = iproto_connection_new(fd);
 	if (con == NULL)
 		return -1;
+	/* Count statistics */
+	rmean_collect(rmean_net, IPROTO_CONNECTIONS, 1);
 	/*
 	 * Ignore msg allocation failure - the queue size is
 	 * fixed so there is a limited number of msgs in
diff --git a/test/box/stat_net.result b/test/box/stat_net.result
index b3e3db11f..be7f2ff8a 100644
--- a/test/box/stat_net.result
+++ b/test/box/stat_net.result
@@ -46,6 +46,10 @@ box.stat.net.RECEIVED.total > 0
 ---
 - true
 ...
+box.stat.net.CONNECTIONS.total > 0
+---
+- true
+...
 -- box.stat.net.EVENTS.total > 0
 -- box.stat.net.LOCKS.total > 0
 -- reset
@@ -60,6 +64,10 @@ box.stat.net.RECEIVED.total
 ---
 - 0
 ...
+box.stat.net.CONNECTIONS.total
+---
+- 0
+...
 space:drop() -- tweedledum
 ---
 ...
diff --git a/test/box/stat_net.test.lua b/test/box/stat_net.test.lua
index 808bb71e7..43d388ccd 100644
--- a/test/box/stat_net.test.lua
+++ b/test/box/stat_net.test.lua
@@ -18,6 +18,7 @@ cn.space.tweedledum:select() --small request
 
 box.stat.net.SENT.total > 0
 box.stat.net.RECEIVED.total > 0
+box.stat.net.CONNECTIONS.total > 0
 -- box.stat.net.EVENTS.total > 0
 -- box.stat.net.LOCKS.total > 0
 
@@ -25,6 +26,7 @@ box.stat.net.RECEIVED.total > 0
 box.stat.reset()
 box.stat.net.SENT.total
 box.stat.net.RECEIVED.total
+box.stat.net.CONNECTIONS.total
 
 space:drop() -- tweedledum
 cn:close()
-- 
2.17.1