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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.
//
#include <grpc/support/port_platform.h>
#include "src/core/lib/resolver/resolver_registry.h"
#include <initializer_list>
#include "y_absl/status/status.h"
#include "y_absl/status/statusor.h"
#include "y_absl/strings/ascii.h"
#include "y_absl/strings/str_cat.h"
#include "y_absl/strings/str_format.h"
#include <grpc/support/log.h>
namespace grpc_core {
//
// ResolverRegistry::Builder
//
ResolverRegistry::Builder::Builder() { Reset(); }
void ResolverRegistry::Builder::SetDefaultPrefix(TString default_prefix) {
state_.default_prefix = std::move(default_prefix);
}
namespace {
bool IsLowerCase(y_absl::string_view str) {
for (unsigned char c : str) {
if (y_absl::ascii_isalpha(c) && !y_absl::ascii_islower(c)) return false;
}
return true;
}
} // namespace
void ResolverRegistry::Builder::RegisterResolverFactory(
std::unique_ptr<ResolverFactory> factory) {
GPR_ASSERT(IsLowerCase(factory->scheme()));
auto p = state_.factories.emplace(factory->scheme(), std::move(factory));
GPR_ASSERT(p.second);
}
bool ResolverRegistry::Builder::HasResolverFactory(
y_absl::string_view scheme) const {
return state_.factories.find(scheme) != state_.factories.end();
}
void ResolverRegistry::Builder::Reset() {
state_.factories.clear();
state_.default_prefix = "dns:///";
}
ResolverRegistry ResolverRegistry::Builder::Build() {
return ResolverRegistry(std::move(state_));
}
//
// ResolverRegistry
//
bool ResolverRegistry::IsValidTarget(y_absl::string_view target) const {
TString canonical_target;
URI uri;
ResolverFactory* factory =
FindResolverFactory(target, &uri, &canonical_target);
if (factory == nullptr) return false;
return factory->IsValidUri(uri);
}
OrphanablePtr<Resolver> ResolverRegistry::CreateResolver(
y_absl::string_view target, const ChannelArgs& args,
grpc_pollset_set* pollset_set,
std::shared_ptr<WorkSerializer> work_serializer,
std::unique_ptr<Resolver::ResultHandler> result_handler) const {
TString canonical_target;
ResolverArgs resolver_args;
ResolverFactory* factory =
FindResolverFactory(target, &resolver_args.uri, &canonical_target);
if (factory == nullptr) return nullptr;
resolver_args.args = args;
resolver_args.pollset_set = pollset_set;
resolver_args.work_serializer = std::move(work_serializer);
resolver_args.result_handler = std::move(result_handler);
return factory->CreateResolver(std::move(resolver_args));
}
TString ResolverRegistry::GetDefaultAuthority(
y_absl::string_view target) const {
TString canonical_target;
URI uri;
ResolverFactory* factory =
FindResolverFactory(target, &uri, &canonical_target);
if (factory == nullptr) return "";
return factory->GetDefaultAuthority(uri);
}
TString ResolverRegistry::AddDefaultPrefixIfNeeded(
y_absl::string_view target) const {
TString canonical_target;
URI uri;
FindResolverFactory(target, &uri, &canonical_target);
return canonical_target.empty() ? TString(target) : canonical_target;
}
ResolverFactory* ResolverRegistry::LookupResolverFactory(
y_absl::string_view scheme) const {
auto it = state_.factories.find(scheme);
if (it == state_.factories.end()) return nullptr;
return it->second.get();
}
// Returns the factory for the scheme of \a target. If \a target does
// not parse as a URI, prepends \a default_prefix_ and tries again.
// If URI parsing is successful (in either attempt), sets \a uri to
// point to the parsed URI.
ResolverFactory* ResolverRegistry::FindResolverFactory(
y_absl::string_view target, URI* uri, TString* canonical_target) const {
GPR_ASSERT(uri != nullptr);
y_absl::StatusOr<URI> tmp_uri = URI::Parse(target);
ResolverFactory* factory =
tmp_uri.ok() ? LookupResolverFactory(tmp_uri->scheme()) : nullptr;
if (factory != nullptr) {
*uri = std::move(*tmp_uri);
return factory;
}
*canonical_target = y_absl::StrCat(state_.default_prefix, target);
y_absl::StatusOr<URI> tmp_uri2 = URI::Parse(*canonical_target);
factory = tmp_uri2.ok() ? LookupResolverFactory(tmp_uri2->scheme()) : nullptr;
if (factory != nullptr) {
*uri = std::move(*tmp_uri2);
return factory;
}
if (!tmp_uri.ok() || !tmp_uri2.ok()) {
gpr_log(GPR_ERROR, "%s",
y_absl::StrFormat("Error parsing URI(s). '%s':%s; '%s':%s", target,
tmp_uri.status().ToString(), *canonical_target,
tmp_uri2.status().ToString())
.c_str());
return nullptr;
}
gpr_log(GPR_ERROR, "Don't know how to resolve '%s' or '%s'.",
TString(target).c_str(), canonical_target->c_str());
return nullptr;
}
} // namespace grpc_core
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