tests: add an integration test to check connection thinning

Author: bboreham

integration/321_many_connections_2_test.sh

@@ -0,0 +1,28 @@
+#! /bin/bash
+
+# shellcheck disable=SC1091
+. ./config.sh
+
+start_suite "Test short lived connections between containers on different hosts"
+
+weave_on "$HOST1" launch "$HOST1" "$HOST2"
+weave_on "$HOST2" launch "$HOST1" "$HOST2"
+
+scope_on "$HOST1" launch
+scope_on "$HOST2" launch
+
+server_on "$HOST1"
+client_on "$HOST2"
+
+sleep 30 # need to allow the scopes to poll dns, resolve the other app ids, and send them reports
+
+check() {
+    has_container "$1" nginx
+    has_container "$1" client
+    has_connection containers "$1" client nginx
+}
+
+check "$HOST1"
+check "$HOST2"
+
+scope_end_suite

integration/config.sh

@@ -109,15 +109,17 @@ has_connection_by_id() {
     local from_id="$3"
     local to_id="$4"
     local timeout="${5:-60}"
+    local max_edges="$6:10"
 
     for i in $(seq "$timeout"); do
         local nodes
         local edge
-        edge=$(echo "$nodes" | (jq -r ".nodes[\"$from_id\"].adjacency | contains([\"$to_id\"])" || true) 2>/dev/null)
         nodes=$(curl -s "http://$host:4040/api/topology/${view}?system=show" || true)
+        edge=$(echo "$nodes" | (jq -r ".nodes[\"$from_id\"].adjacency | contains([\"$to_id\"])" || true) 2>/dev/null)
         if [ "$edge" = "true" ]; then
             echo "Found edge $from -> $to after $i secs"
-            assert "curl -s http://$host:4040/api/topology/${view}?system=show |  jq -r '.nodes[\"$from_id\"].adjacency | contains([\"$to_id\"])'" true
+            count=$(echo "$nodes" | jq -r ".nodes[\"$from_id\"].adjacency | length" 2>/dev/null)
+            assert "[ $count -le $max_edges ]"
             return
         fi
         sleep 1