demo use of shard params

pkg/varnish/vcl/testdata/shard_by_key.golden

-
 import std;
 import directors;
 import blob;
@@ -40,7 +39,9 @@ acl vk8s_cluster_acl {
 }
 
 sub vcl_init {
+	new vk8s_cluster_param = directors.shard_param();
 	new vk8s_cluster = directors.shard();
+	vk8s_cluster.associate(vk8s_cluster_param.use());
 	vk8s_cluster.add_backend(vk8s_default_varnish-8445d4f7f-z2b9p_80);
 	vk8s_cluster.add_backend(vk8s_viking-service_172_17_0_13_80);
 	vk8s_cluster.add_backend(vk8s_default_varnish-8445d4f7f-ldljf_80);
@@ -85,11 +86,12 @@ sub vcl_backend_fetch {
 	if (bereq.http.VK8S-Shard-Primary-Only) {
 		return (fetch);
 	}
+	vk8s_cluster_param.set(by=KEY, key=vk8s_cluster.key(bereq.http.Host));
 	if (bereq.retries == 0 
 	    && !bereq.uncacheable
 	    && remote.ip !~ vk8s_cluster_acl
-	    && "" + vk8s_cluster.backend(resolve=NOW, by=KEY, key=vk8s_cluster.key(bereq.http.Host)) != server.identity) {
-		set bereq.backend = vk8s_cluster.backend(resolve=LAZY, by=KEY, key=vk8s_cluster.key(bereq.http.Host));
+	    && "" + vk8s_cluster.backend(resolve=NOW) != server.identity) {
+		set bereq.backend = vk8s_cluster.backend(resolve=LAZY);
 		set bereq.http.VK8S-Is-Bgfetch = bereq.is_bgfetch;
 		return (fetch);
 	}
@@ -99,7 +101,7 @@ sub vcl_backend_response {
 	if (bereq.http.VK8S-Shard-Primary-Only) {
 		return (deliver);
 	}
-	if (bereq.backend == vk8s_cluster.backend(resolve=LAZY, by=KEY, key=vk8s_cluster.key(bereq.http.Host))) {
+	if (bereq.backend == vk8s_cluster.backend(resolve=LAZY)) {
 	        if (beresp.http.VK8S-Cluster-TTL) {
 		        set beresp.ttl = std.duration(
                 	    beresp.http.VK8S-Cluster-TTL + "s", 1s);
@@ -116,7 +118,7 @@ sub vcl_backend_response {
 }
 
 sub vcl_backend_error {
-	if (bereq.backend == vk8s_cluster.backend(resolve=LAZY, by=KEY, key=vk8s_cluster.key(bereq.http.Host))) {
+	if (bereq.backend == vk8s_cluster.backend(resolve=LAZY)) {
 		return (deliver);
 	}
 }