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/*
*
* Copyright 2016 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_DNS_C_ARES_GRPC_ARES_WRAPPER_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_DNS_C_ARES_GRPC_ARES_WRAPPER_H
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "src/core/lib/iomgr/polling_entity.h"
#include "src/core/lib/iomgr/resolve_address.h"
extern grpc_core::TraceFlag grpc_trace_cares_address_sorting;
extern grpc_core::TraceFlag grpc_trace_cares_resolver;
#define GRPC_CARES_TRACE_LOG(format, ...) \
if (grpc_trace_cares_resolver.enabled()) { \
gpr_log(GPR_DEBUG, "(c-ares resolver) " format, __VA_ARGS__); \
}
typedef struct grpc_ares_request grpc_ares_request;
/* Asynchronously resolve \a name. Use \a default_port if a port isn't
designated in \a name, otherwise use the port in \a name. grpc_ares_init()
must be called at least once before this function. \a on_done may be
called directly in this function without being scheduled with \a exec_ctx,
so it must not try to acquire locks that are being held by the caller. */
extern void (*grpc_resolve_address_ares)(const char* name,
const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addresses);
/* Asynchronously resolve \a name. It will try to resolve grpclb SRV records in
addition to the normal address records. For normal address records, it uses
\a default_port if a port isn't designated in \a name, otherwise it uses the
port in \a name. grpc_ares_init() must be called at least once before this
function. \a on_done may be called directly in this function without being
scheduled with \a exec_ctx, so it must not try to acquire locks that are
being held by the caller. */
extern grpc_ares_request* (*grpc_dns_lookup_ares_locked)(
const char* dns_server, const char* name, const char* default_port,
grpc_pollset_set* interested_parties, grpc_closure* on_done,
grpc_lb_addresses** addresses, bool check_grpclb,
char** service_config_json, grpc_combiner* combiner);
/* Cancel the pending grpc_ares_request \a request */
void grpc_cancel_ares_request(grpc_ares_request* request);
/* Initialize gRPC ares wrapper. Must be called at least once before
grpc_resolve_address_ares(). */
grpc_error* grpc_ares_init(void);
/* Uninitialized gRPC ares wrapper. If there was more than one previous call to
grpc_ares_init(), this function uninitializes the gRPC ares wrapper only if
it has been called the same number of times as grpc_ares_init(). */
void grpc_ares_cleanup(void);
/** Schedules the desired callback for request completion
* and destroys the grpc_ares_request */
void grpc_ares_complete_request_locked(grpc_ares_request* request);
/* Indicates whether or not AAAA queries should be attempted. */
/* E.g., return false if ipv6 is known to not be available. */
bool grpc_ares_query_ipv6();
/* Exposed only for testing */
void grpc_cares_wrapper_test_only_address_sorting_sort(
grpc_lb_addresses* lb_addrs);
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_DNS_C_ARES_GRPC_ARES_WRAPPER_H \
*/
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