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/*
*
* Copyright 2017, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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_channel.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/security/transport/lb_targets_info.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/support/string.h"
grpc_channel *grpc_lb_policy_grpclb_create_lb_channel(
grpc_exec_ctx *exec_ctx, const char *lb_service_target_addresses,
grpc_client_channel_factory *client_channel_factory,
grpc_channel_args *args) {
grpc_channel_args *new_args = args;
grpc_channel_credentials *channel_credentials =
grpc_channel_credentials_find_in_args(args);
if (channel_credentials != NULL) {
/* Substitute the channel credentials with a version without call
* credentials: the load balancer is not necessarily trusted to handle
* bearer token credentials */
static const char *keys_to_remove[] = {GRPC_ARG_CHANNEL_CREDENTIALS};
grpc_channel_credentials *creds_sans_call_creds =
grpc_channel_credentials_duplicate_without_call_credentials(
channel_credentials);
GPR_ASSERT(creds_sans_call_creds != NULL);
grpc_arg args_to_add[] = {
grpc_channel_credentials_to_arg(creds_sans_call_creds)};
/* Create the new set of channel args */
new_args = grpc_channel_args_copy_and_add_and_remove(
args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), args_to_add,
GPR_ARRAY_SIZE(args_to_add));
grpc_channel_credentials_unref(exec_ctx, creds_sans_call_creds);
}
grpc_channel *lb_channel = grpc_client_channel_factory_create_channel(
exec_ctx, client_channel_factory, lb_service_target_addresses,
GRPC_CLIENT_CHANNEL_TYPE_LOAD_BALANCING, new_args);
if (channel_credentials != NULL) {
grpc_channel_args_destroy(exec_ctx, new_args);
}
return lb_channel;
}
grpc_channel_args *get_lb_channel_args(grpc_exec_ctx *exec_ctx,
grpc_slice_hash_table *targets_info,
const grpc_channel_args *args) {
const grpc_arg targets_info_arg =
grpc_lb_targets_info_create_channel_arg(targets_info);
/* We strip out the channel arg for the LB policy name, since we want
* to use the default (pick_first) in this case.
*
* We also strip out the channel arg for the resolved addresses, since
* that will be generated by the name resolver used in the LB channel.
* Note that the LB channel will use the sockaddr resolver, so this
* won't actually generate a query to DNS (or some other name service).
* However, the addresses returned by the sockaddr resolver will have
* is_balancer=false, whereas our own addresses have is_balancer=true.
* We need the LB channel to return addresses with is_balancer=false
* so that it does not wind up recursively using the grpclb LB policy,
* as per the special case logic in client_channel.c.
*
* Lastly, we also strip out the channel arg for the server URI,
* since that will be different for the LB channel than for the parent
* channel (the client channel factory will re-add this arg with
* the right value). */
static const char *keys_to_remove[] = {
GRPC_ARG_LB_POLICY_NAME, GRPC_ARG_LB_ADDRESSES, GRPC_ARG_SERVER_URI};
/* Add the targets info table to be used for secure naming */
return grpc_channel_args_copy_and_add_and_remove(
args, keys_to_remove, GPR_ARRAY_SIZE(keys_to_remove), &targets_info_arg,
1);
}
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