[PATCH v9 16/16] net: stream: add QAPI events to report connection state

[Laurent Vivier]

The netdev reports NETDEV_STREAM_CONNECTED event when the backend
is connected, and NETDEV_STREAM_EOC when it is disconnected.

The NETDEV_STREAM_CONNECTED event includes the URI of the destination
address.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 net/stream.c  | 11 +++++++++--
 qapi/net.json | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/net/stream.c b/net/stream.c
index 9b50a32531a9..745967c3608d 100644
--- a/net/stream.c
+++ b/net/stream.c
@@ -38,6 +38,7 @@
 #include "io/channel.h"
 #include "io/channel-socket.h"
 #include "io/net-listener.h"
+#include "qapi/qapi-events-net.h"
 
 typedef struct NetStreamState {
     NetClientState nc;
@@ -169,6 +170,8 @@ static gboolean net_stream_send(QIOChannel *ioc,
         s->nc.link_down = true;
         memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
 
+        qapi_event_send_netdev_stream_eoc(s->nc.name);
+
         return G_SOURCE_REMOVE;
     }
     buf = buf1;
@@ -244,9 +247,10 @@ static void net_stream_listen(QIONetListener *listener,
     g_assert(addr != NULL);
     uri = socket_uri(addr);
     pstrcpy(s->nc.info_str, sizeof(s->nc.info_str), uri);
-    g_free(uri);
     qapi_free_SocketAddress(addr);
 
+    qapi_event_send_netdev_stream_connected(s->nc.name, uri);
+    g_free(uri);
 }
 
 static void net_stream_server_listening(QIOTask *task, gpointer opaque)
@@ -319,13 +323,13 @@ static void net_stream_client_connected(QIOTask *task, 
gpointer opaque)
     g_assert(addr != NULL);
     uri = socket_uri(addr);
     pstrcpy(s->nc.info_str, sizeof(s->nc.info_str), uri);
-    g_free(uri);
 
     ret = qemu_socket_try_set_nonblock(sioc->fd);
     if (addr->type == SOCKET_ADDRESS_TYPE_FD && ret < 0) {
         snprintf(s->nc.info_str, sizeof(s->nc.info_str),
                  "can't use file descriptor %s (errno %d)",
                  addr->u.fd.str, -ret);
+        g_free(uri);
         return;
     }
     g_assert(ret == 0);
@@ -338,6 +342,9 @@ static void net_stream_client_connected(QIOTask *task, 
gpointer opaque)
 
     s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
                                             s, NULL);
+
+    qapi_event_send_netdev_stream_connected(s->nc.name, uri);
+    g_free(uri);
 }
 
 static int net_stream_client_init(NetClientState *peer,
diff --git a/qapi/net.json b/qapi/net.json
index 9cc4be7535bb..6bf919afc26a 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -892,3 +892,49 @@
 ##
 { 'event': 'FAILOVER_NEGOTIATED',
   'data': {'device-id': 'str'} }
+
+##
+# @NETDEV_STREAM_CONNECTED:
+#
+# Emitted when the netdev stream backend is connected
+#
+# @netdev-id: QEMU netdev id that is connected
+# @uri: The Uniform Resource Identifier identifying the destination address
+#
+# Since: 7.2
+#
+# Example:
+#
+# <- { 'event': 'NETDEV_STREAM_CONNECTED',
+#      'data': {'uri': 'tcp:::1:1234', 'netdev-id': 'netdev0'},
+#      'timestamp': {'seconds': 1663330564, 'microseconds': 804317} }
+#
+# or
+#
+# <- { 'event': 'NETDEV_STREAM_CONNECTED',
+#      'data': {'uri': ''unix:/tmp/qemu0', 'netdev-id': 'netdev0'},
+#      'timestamp': {'seconds': 1663330564, 'microseconds': 804317} }
+#
+##
+{ 'event': 'NETDEV_STREAM_CONNECTED',
+  'data': { 'netdev-id': 'str',
+            'uri': 'str' } }
+
+##
+# @NETDEV_STREAM_EOC:
+#
+# Emitted when the netdev stream backend is disconnected
+#
+# @netdev-id: QEMU netdev id that is disconnected
+#
+# Since: 7.2
+#
+# Example:
+#
+# <- { 'event': 'NETDEV_STREAM_EOC',
+#      'data': {'netdev-id': 'netdev0'},
+#      'timestamp': {'seconds': 1663330937, 'microseconds': 526695} }
+#
+##
+{ 'event': 'NETDEV_STREAM_EOC',
+  'data': { 'netdev-id': 'str' } }
-- 
2.37.3