| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_H |
| #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_H |
| |
| #include "src/core/ext/filters/client_channel/subchannel.h" |
| #include "src/core/lib/iomgr/iomgr.h" |
| |
| typedef struct grpc_resolver grpc_resolver; |
| typedef struct grpc_resolver_vtable grpc_resolver_vtable; |
| |
| #ifndef NDEBUG |
| extern grpc_tracer_flag grpc_trace_resolver_refcount; |
| #endif |
| |
| /** \a grpc_resolver provides \a grpc_channel_args objects to its caller */ |
| struct grpc_resolver { |
| const grpc_resolver_vtable *vtable; |
| gpr_refcount refs; |
| grpc_combiner *combiner; |
| }; |
| |
| struct grpc_resolver_vtable { |
| void (*destroy)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver); |
| void (*shutdown_locked)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver); |
| void (*channel_saw_error_locked)(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver); |
| void (*next_locked)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_channel_args **result, grpc_closure *on_complete); |
| }; |
| |
| #ifndef NDEBUG |
| #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p), __FILE__, __LINE__, (r)) |
| #define GRPC_RESOLVER_UNREF(e, p, r) \ |
| grpc_resolver_unref((e), (p), __FILE__, __LINE__, (r)) |
| void grpc_resolver_ref(grpc_resolver *policy, const char *file, int line, |
| const char *reason); |
| void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *policy, |
| const char *file, int line, const char *reason); |
| #else |
| #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p)) |
| #define GRPC_RESOLVER_UNREF(e, p, r) grpc_resolver_unref((e), (p)) |
| void grpc_resolver_ref(grpc_resolver *policy); |
| void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *policy); |
| #endif |
| |
| void grpc_resolver_init(grpc_resolver *resolver, |
| const grpc_resolver_vtable *vtable, |
| grpc_combiner *combiner); |
| |
| void grpc_resolver_shutdown_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver); |
| |
| /** Notification that the channel has seen an error on some address. |
| Can be used as a hint that re-resolution is desirable soon. |
| |
| Must be called from the combiner passed as a resolver_arg at construction |
| time.*/ |
| void grpc_resolver_channel_saw_error_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver); |
| |
| /** Get the next result from the resolver. Expected to set \a *result with |
| new channel args and then schedule \a on_complete for execution. |
| |
| If resolution is fatally broken, set \a *result to NULL and |
| schedule \a on_complete. |
| |
| Must be called from the combiner passed as a resolver_arg at construction |
| time.*/ |
| void grpc_resolver_next_locked(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_channel_args **result, |
| grpc_closure *on_complete); |
| |
| #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_H */ |