add mutex to route for peering (#3439) (#6243)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3439.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+compute: Added lock to prevent `google_compute_route` from changing while peering operations are happening on its network
+```

google/resource_compute_route.go

@@ -247,6 +247,13 @@ func resourceComputeRouteCreate(d *schema.ResourceData, meta interface{}) error
 		obj["nextHopIlb"] = nextHopIlbProp
 	}
 
+	lockName, err := replaceVars(d, config, "projects/{{project}}/global/networks/{{network}}/peerings")
+	if err != nil {
+		return err
+	}
+	mutexKV.Lock(lockName)
+	defer mutexKV.Unlock(lockName)
+
 	url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/global/routes")
 	if err != nil {
 		return err
@@ -368,6 +375,13 @@ func resourceComputeRouteDelete(d *schema.ResourceData, meta interface{}) error
 		return err
 	}
 
+	lockName, err := replaceVars(d, config, "projects/{{project}}/global/networks/{{network}}/peerings")
+	if err != nil {
+		return err
+	}
+	mutexKV.Lock(lockName)
+	defer mutexKV.Unlock(lockName)
+
 	url, err := replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/global/routes/{{name}}")
 	if err != nil {
 		return err