Introduced grpc_lb_policy_args

src/core/client_config/lb_policies/pick_first.c

@@ -320,18 +320,17 @@ static void pick_first_factory_ref(grpc_lb_policy_factory *factory) {}
 static void pick_first_factory_unref(grpc_lb_policy_factory *factory) {}
 
 static grpc_lb_policy *create_pick_first(grpc_lb_policy_factory *factory,
-                                         grpc_subchannel **subchannels,
+                                         grpc_lb_policy_args *args) {
-                                         size_t num_subchannels) {
   pick_first_lb_policy *p = gpr_malloc(sizeof(*p));
-  GPR_ASSERT(num_subchannels);
+  GPR_ASSERT(args->num_subchannels > 0);
   memset(p, 0, sizeof(*p));
   grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
-  p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * num_subchannels);
+  p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
-  p->num_subchannels = num_subchannels;
+  p->num_subchannels = args->num_subchannels;
   grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
                                "pick_first");
-  memcpy(p->subchannels, subchannels,
+  memcpy(p->subchannels, args->subchannels,
-         sizeof(grpc_subchannel *) * num_subchannels);
+         sizeof(grpc_subchannel *) * args->num_subchannels);
   grpc_iomgr_closure_init(&p->connectivity_changed, pf_connectivity_changed, p);
   gpr_mu_init(&p->mu);
   return &p->base;

src/core/client_config/lb_policy_factory.c

@@ -41,9 +41,7 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory *factory) {
 }
 
 grpc_lb_policy *grpc_lb_policy_factory_create_lb_policy(
-    grpc_lb_policy_factory *factory, grpc_subchannel **subchannels,
+    grpc_lb_policy_factory *factory, grpc_lb_policy_args *args) {
-    size_t num_subchannels) {
   if (factory == NULL) return NULL;
-  return factory->vtable->create_lb_policy(factory, subchannels,
+  return factory->vtable->create_lb_policy(factory, args);
-                                           num_subchannels);
 }

src/core/client_config/lb_policy_factory.h

@@ -46,14 +46,18 @@ struct grpc_lb_policy_factory {
   const grpc_lb_policy_factory_vtable *vtable;
 };
 
+typedef struct grpc_lb_policy_args {
+  grpc_subchannel **subchannels;
+  size_t num_subchannels;
+} grpc_lb_policy_args;
+
 struct grpc_lb_policy_factory_vtable {
   void (*ref)(grpc_lb_policy_factory *factory);
   void (*unref)(grpc_lb_policy_factory *factory);
 
   /** Implementation of grpc_lb_policy_factory_create_lb_policy */
   grpc_lb_policy *(*create_lb_policy)(grpc_lb_policy_factory *factory,
-                                      grpc_subchannel **subchannels,
+                                      grpc_lb_policy_args *args);
-                                      size_t num_subchannels);
 
   /** Name for the LB policy this factory implements */
   const char *name;
@@ -64,7 +68,6 @@ void grpc_lb_policy_factory_unref(grpc_lb_policy_factory *factory);
 
 /** Create a lb_policy instance. */
 grpc_lb_policy *grpc_lb_policy_factory_create_lb_policy(
-    grpc_lb_policy_factory *factory, grpc_subchannel **subchannels,
+    grpc_lb_policy_factory *factory, grpc_lb_policy_args *args);
-    size_t num_subchannels);
 
 #endif /* GRPC_INTERNAL_CORE_CONFIG_LB_POLICY_FACTORY_H */

src/core/client_config/lb_policy_registry.c

@@ -80,10 +80,9 @@ static grpc_lb_policy_factory *lookup_factory(const char* name) {
 }
 
 grpc_lb_policy *grpc_lb_policy_create(const char *name,
-                                      grpc_subchannel **subchannels,
+                                      grpc_lb_policy_args *args) {
-                                      size_t num_subchannels) {
   grpc_lb_policy_factory *factory = lookup_factory(name);
   grpc_lb_policy *lb_policy = grpc_lb_policy_factory_create_lb_policy(
-      factory, subchannels, num_subchannels);
+      factory, args);
   return lb_policy;
 }

src/core/client_config/lb_policy_registry.h

@@ -49,7 +49,6 @@ void grpc_register_lb_policy(grpc_lb_policy_factory *factory);
  * If \a name is NULL, the default factory from \a grpc_lb_policy_registry_init
  * will be returned. */
 grpc_lb_policy *grpc_lb_policy_create(const char *name,
-                                      grpc_subchannel **subchannels,
+                                      grpc_lb_policy_args *args);
-                                      size_t num_subchannels);
 
 #endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_LB_POLICY_REGISTRY_H */

src/core/client_config/resolvers/dns_resolver.c

@@ -134,6 +134,7 @@ static void dns_on_resolved(void *arg, grpc_resolved_addresses *addresses) {
   grpc_lb_policy *lb_policy;
   size_t i;
   if (addresses) {
+    grpc_lb_policy_args lb_policy_args;
     config = grpc_client_config_create();
     subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
     for (i = 0; i < addresses->naddrs; i++) {
@@ -143,8 +144,9 @@ static void dns_on_resolved(void *arg, grpc_resolved_addresses *addresses) {
       subchannels[i] = grpc_subchannel_factory_create_subchannel(
           r->subchannel_factory, &args);
     }
-    lb_policy = grpc_lb_policy_create(r->lb_policy_name, subchannels,
+    lb_policy_args.subchannels = subchannels;
-                                      addresses->naddrs);
+    lb_policy_args.num_subchannels = addresses->naddrs;
+    lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
     grpc_client_config_set_lb_policy(config, lb_policy);
     GRPC_LB_POLICY_UNREF(lb_policy, "construction");
     grpc_resolved_addresses_destroy(addresses);

src/core/client_config/resolvers/sockaddr_resolver.c

@@ -121,6 +121,7 @@ static void sockaddr_next(grpc_resolver *resolver,
 static void sockaddr_maybe_finish_next_locked(sockaddr_resolver *r) {
   grpc_client_config *cfg;
   grpc_lb_policy *lb_policy;
+  grpc_lb_policy_args lb_policy_args;
   grpc_subchannel **subchannels;
   grpc_subchannel_args args;
 
@@ -135,8 +136,10 @@ static void sockaddr_maybe_finish_next_locked(sockaddr_resolver *r) {
       subchannels[i] = grpc_subchannel_factory_create_subchannel(
           r->subchannel_factory, &args);
     }
+    lb_policy_args.subchannels = subchannels;
+    lb_policy_args.num_subchannels = r->num_addrs;
     lb_policy =
-        grpc_lb_policy_create(r->lb_policy_name, subchannels, r->num_addrs);
+        grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
     gpr_free(subchannels);
     grpc_client_config_set_lb_policy(cfg, lb_policy);
     GRPC_LB_POLICY_UNREF(lb_policy, "unix");