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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_REGISTRY_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_REGISTRY_H
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/resolver_factory.h"
#include "src/core/lib/gprpp/inlined_vector.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/gprpp/orphanable.h"
#include "src/core/lib/iomgr/pollset_set.h"
namespace grpc_core {
class ResolverRegistry {
public:
/// Methods used to create and populate the ResolverRegistry.
/// NOT THREAD SAFE -- to be used only during global gRPC
/// initialization and shutdown.
class Builder {
public:
/// Global initialization and shutdown hooks.
static void InitRegistry();
static void ShutdownRegistry();
/// Sets the default URI prefix to \a default_prefix.
/// Calls InitRegistry() if it has not already been called.
static void SetDefaultPrefix(const char* default_prefix);
/// Registers a resolver factory. The factory will be used to create a
/// resolver for any URI whose scheme matches that of the factory.
/// Calls InitRegistry() if it has not already been called.
static void RegisterResolverFactory(UniquePtr<ResolverFactory> factory);
};
/// Creates a resolver given \a target.
/// First tries to parse \a target as a URI. If this succeeds, tries
/// to locate a registered resolver factory based on the URI scheme.
/// If parsing fails or there is no factory for the URI's scheme,
/// prepends default_prefix to target and tries again.
/// If a resolver factory is found, uses it to instantiate a resolver and
/// returns it; otherwise, returns nullptr.
/// \a args, \a pollset_set, and \a combiner are passed to the factory's
/// \a CreateResolver() method.
/// \a args are the channel args to be included in resolver results.
/// \a pollset_set is used to drive I/O in the name resolution process.
/// \a combiner is the combiner under which all resolver calls will be run.
static OrphanablePtr<Resolver> CreateResolver(const char* target,
const grpc_channel_args* args,
grpc_pollset_set* pollset_set,
grpc_combiner* combiner);
/// Returns the default authority to pass from a client for \a target.
static UniquePtr<char> GetDefaultAuthority(const char* target);
/// Returns \a target with the default prefix prepended, if needed.
static UniquePtr<char> AddDefaultPrefixIfNeeded(const char* target);
/// Returns the resolver factory for \a scheme.
/// Caller does NOT own the return value.
static ResolverFactory* LookupResolverFactory(const char* scheme);
};
} // namespace grpc_core
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_RESOLVER_REGISTRY_H */
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