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/*
*
* 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"
#ifdef __cplusplus
extern "C" {
#endif
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);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_H */
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