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/*
*
* Copyright 2018 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/xds/xds_channel.h"
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include <string.h>
#include "src/core/ext/filters/client_channel/client_channel.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/security/transport/target_authority_table.h"
#include "src/core/lib/slice/slice_internal.h"
namespace grpc_core {
namespace {
int BalancerNameCmp(const grpc_core::UniquePtr<char>& a,
const grpc_core::UniquePtr<char>& b) {
return strcmp(a.get(), b.get());
}
RefCountedPtr<TargetAuthorityTable> CreateTargetAuthorityTable(
const ServerAddressList& addresses) {
TargetAuthorityTable::Entry* target_authority_entries =
static_cast<TargetAuthorityTable::Entry*>(
gpr_zalloc(sizeof(*target_authority_entries) * addresses.size()));
for (size_t i = 0; i < addresses.size(); ++i) {
char* addr_str;
GPR_ASSERT(
grpc_sockaddr_to_string(&addr_str, &addresses[i].address(), true) > 0);
target_authority_entries[i].key = grpc_slice_from_copied_string(addr_str);
gpr_free(addr_str);
char* balancer_name = grpc_channel_arg_get_string(grpc_channel_args_find(
addresses[i].args(), GRPC_ARG_ADDRESS_BALANCER_NAME));
target_authority_entries[i].value.reset(gpr_strdup(balancer_name));
}
RefCountedPtr<TargetAuthorityTable> target_authority_table =
TargetAuthorityTable::Create(addresses.size(), target_authority_entries,
BalancerNameCmp);
gpr_free(target_authority_entries);
return target_authority_table;
}
} // namespace
} // namespace grpc_core
grpc_channel_args* grpc_lb_policy_xds_modify_lb_channel_args(
grpc_channel_args* args) {
const char* args_to_remove[1];
size_t num_args_to_remove = 0;
grpc_arg args_to_add[2];
size_t num_args_to_add = 0;
// Add arg for targets info table.
grpc_core::ServerAddressList* addresses =
grpc_core::FindServerAddressListChannelArg(args);
GPR_ASSERT(addresses != nullptr);
grpc_core::RefCountedPtr<grpc_core::TargetAuthorityTable>
target_authority_table =
grpc_core::CreateTargetAuthorityTable(*addresses);
args_to_add[num_args_to_add++] =
grpc_core::CreateTargetAuthorityTableChannelArg(
target_authority_table.get());
// 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);
grpc_core::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[num_args_to_remove++] = GRPC_ARG_CHANNEL_CREDENTIALS;
args_to_add[num_args_to_add++] =
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, num_args_to_remove, args_to_add, num_args_to_add);
// Clean up.
grpc_channel_args_destroy(args);
return result;
}
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