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/*
*
* 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/resolver_result.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;
/** grpc_resolver provides grpc_resolver_result objects to grpc_channel
objects */
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_resolver_result **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 client config. Called by the channel to fetch a new
configuration. Expected to set *result with a new configuration,
and then schedule on_complete for execution.
If resolution is fatally broken, set *result to NULL and
schedule on_complete. */
void grpc_resolver_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver,
grpc_resolver_result **result,
grpc_closure *on_complete);
#endif /* GRPC_CORE_EXT_CLIENT_CHANNEL_RESOLVER_H */
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