| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_EXT_CLIENT_CHANNEL_RESOLVER_H |
| #define GRPC_CORE_EXT_CLIENT_CHANNEL_RESOLVER_H |
| |
| #include "src/core/ext/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; |
| |
| /** \a grpc_resolver provides \a grpc_channel_args objects to its caller */ |
| struct grpc_resolver { |
| const grpc_resolver_vtable *vtable; |
| gpr_refcount refs; |
| }; |
| |
| struct grpc_resolver_vtable { |
| void (*destroy)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver); |
| void (*shutdown)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver); |
| void (*channel_saw_error)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver); |
| void (*next)(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_channel_args **result, grpc_closure *on_complete); |
| }; |
| |
| #ifdef GRPC_RESOLVER_REFCOUNT_DEBUG |
| #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p), __FILE__, __LINE__, (r)) |
| #define GRPC_RESOLVER_UNREF(cl, p, r) \ |
| grpc_resolver_unref((cl), (p), __FILE__, __LINE__, (r)) |
| void grpc_resolver_ref(grpc_resolver *policy, const char *file, int line, |
| const char *reason); |
| void grpc_resolver_unref(grpc_resolver *policy, grpc_closure_list *closure_list, |
| const char *file, int line, const char *reason); |
| #else |
| #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p)) |
| #define GRPC_RESOLVER_UNREF(cl, p, r) grpc_resolver_unref((cl), (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); |
| |
| void grpc_resolver_shutdown(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. */ |
| void grpc_resolver_channel_saw_error(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. */ |
| void grpc_resolver_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_channel_args **result, grpc_closure *on_complete); |
| |
| #endif /* GRPC_CORE_EXT_CLIENT_CHANNEL_RESOLVER_H */ |