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/*
*
* Copyright 2017 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/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel.h"
#include <string.h>
#include "absl/container/inlined_vector.h"
#include <grpc/grpc_security.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/client_channel.h"
#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_balancer_addresses.h"
#include "src/core/ext/filters/client_channel/server_address.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/slice/slice_internal.h"
namespace grpc_core {
grpc_channel_args* ModifyGrpclbBalancerChannelArgs(
const ServerAddressList& addresses, grpc_channel_args* args) {
absl::InlinedVector<const char*, 1> args_to_remove;
absl::InlinedVector<grpc_arg, 1> args_to_add;
// Substitute the channel credentials with a version without call
// credentials: the load balancer is not necessarily trusted to handle
// bearer token credentials.
grpc_channel_credentials* channel_credentials =
grpc_channel_credentials_find_in_args(args);
RefCountedPtr<grpc_channel_credentials> creds_sans_call_creds;
if (channel_credentials != nullptr) {
creds_sans_call_creds =
channel_credentials->duplicate_without_call_credentials();
GPR_ASSERT(creds_sans_call_creds != nullptr);
args_to_remove.emplace_back(GRPC_ARG_CHANNEL_CREDENTIALS);
args_to_add.emplace_back(
grpc_channel_credentials_to_arg(creds_sans_call_creds.get()));
}
grpc_channel_args* result = grpc_channel_args_copy_and_add_and_remove(
args, args_to_remove.data(), args_to_remove.size(), args_to_add.data(),
args_to_add.size());
// Clean up.
grpc_channel_args_destroy(args);
return result;
}
grpc_channel* CreateGrpclbBalancerChannel(const char* target_uri,
const grpc_channel_args& args) {
grpc_channel_credentials* creds =
grpc_channel_credentials_find_in_args(&args);
if (creds == nullptr) {
// Build with security but parent channel is insecure.
return grpc_insecure_channel_create(target_uri, &args, nullptr);
}
const char* arg_to_remove = GRPC_ARG_CHANNEL_CREDENTIALS;
grpc_channel_args* new_args =
grpc_channel_args_copy_and_remove(&args, &arg_to_remove, 1);
grpc_channel* channel =
grpc_secure_channel_create(creds, target_uri, new_args, nullptr);
grpc_channel_args_destroy(new_args);
return channel;
}
} // namespace grpc_core
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