diff options
Diffstat (limited to 'src/core/ext/filters/client_channel/lb_policy_factory.cc')
| -rw-r--r-- | src/core/ext/filters/client_channel/lb_policy_factory.cc | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/src/core/ext/filters/client_channel/lb_policy_factory.cc b/src/core/ext/filters/client_channel/lb_policy_factory.cc new file mode 100644 index 0000000000..5c6363d295 --- /dev/null +++ b/src/core/ext/filters/client_channel/lb_policy_factory.cc @@ -0,0 +1,163 @@ +/* + * + * 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 <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/string_util.h> + +#include "src/core/lib/channel/channel_args.h" + +#include "src/core/ext/filters/client_channel/lb_policy_factory.h" +#include "src/core/ext/filters/client_channel/parse_address.h" + +grpc_lb_addresses* grpc_lb_addresses_create( + size_t num_addresses, const grpc_lb_user_data_vtable* user_data_vtable) { + grpc_lb_addresses* addresses = + static_cast<grpc_lb_addresses*>(gpr_zalloc(sizeof(grpc_lb_addresses))); + addresses->num_addresses = num_addresses; + addresses->user_data_vtable = user_data_vtable; + const size_t addresses_size = sizeof(grpc_lb_address) * num_addresses; + addresses->addresses = + static_cast<grpc_lb_address*>(gpr_zalloc(addresses_size)); + return addresses; +} + +grpc_lb_addresses* grpc_lb_addresses_copy(const grpc_lb_addresses* addresses) { + grpc_lb_addresses* new_addresses = grpc_lb_addresses_create( + addresses->num_addresses, addresses->user_data_vtable); + memcpy(new_addresses->addresses, addresses->addresses, + sizeof(grpc_lb_address) * addresses->num_addresses); + for (size_t i = 0; i < addresses->num_addresses; ++i) { + if (new_addresses->addresses[i].balancer_name != nullptr) { + new_addresses->addresses[i].balancer_name = + gpr_strdup(new_addresses->addresses[i].balancer_name); + } + if (new_addresses->addresses[i].user_data != nullptr) { + new_addresses->addresses[i].user_data = addresses->user_data_vtable->copy( + new_addresses->addresses[i].user_data); + } + } + return new_addresses; +} + +void grpc_lb_addresses_set_address(grpc_lb_addresses* addresses, size_t index, + const void* address, size_t address_len, + bool is_balancer, const char* balancer_name, + void* user_data) { + GPR_ASSERT(index < addresses->num_addresses); + if (user_data != nullptr) GPR_ASSERT(addresses->user_data_vtable != nullptr); + grpc_lb_address* target = &addresses->addresses[index]; + memcpy(target->address.addr, address, address_len); + target->address.len = static_cast<socklen_t>(address_len); + target->is_balancer = is_balancer; + target->balancer_name = gpr_strdup(balancer_name); + target->user_data = user_data; +} + +bool grpc_lb_addresses_set_address_from_uri(grpc_lb_addresses* addresses, + size_t index, const grpc_uri* uri, + bool is_balancer, + const char* balancer_name, + void* user_data) { + grpc_resolved_address address; + if (!grpc_parse_uri(uri, &address)) return false; + grpc_lb_addresses_set_address(addresses, index, address.addr, address.len, + is_balancer, balancer_name, user_data); + return true; +} + +int grpc_lb_addresses_cmp(const grpc_lb_addresses* addresses1, + const grpc_lb_addresses* addresses2) { + if (addresses1->num_addresses > addresses2->num_addresses) return 1; + if (addresses1->num_addresses < addresses2->num_addresses) return -1; + if (addresses1->user_data_vtable > addresses2->user_data_vtable) return 1; + if (addresses1->user_data_vtable < addresses2->user_data_vtable) return -1; + for (size_t i = 0; i < addresses1->num_addresses; ++i) { + const grpc_lb_address* target1 = &addresses1->addresses[i]; + const grpc_lb_address* target2 = &addresses2->addresses[i]; + if (target1->address.len > target2->address.len) return 1; + if (target1->address.len < target2->address.len) return -1; + int retval = memcmp(target1->address.addr, target2->address.addr, + target1->address.len); + if (retval != 0) return retval; + if (target1->is_balancer > target2->is_balancer) return 1; + if (target1->is_balancer < target2->is_balancer) return -1; + const char* balancer_name1 = + target1->balancer_name != nullptr ? target1->balancer_name : ""; + const char* balancer_name2 = + target2->balancer_name != nullptr ? target2->balancer_name : ""; + retval = strcmp(balancer_name1, balancer_name2); + if (retval != 0) return retval; + if (addresses1->user_data_vtable != nullptr) { + retval = addresses1->user_data_vtable->cmp(target1->user_data, + target2->user_data); + if (retval != 0) return retval; + } + } + return 0; +} + +void grpc_lb_addresses_destroy(grpc_lb_addresses* addresses) { + for (size_t i = 0; i < addresses->num_addresses; ++i) { + gpr_free(addresses->addresses[i].balancer_name); + if (addresses->addresses[i].user_data != nullptr) { + addresses->user_data_vtable->destroy(addresses->addresses[i].user_data); + } + } + gpr_free(addresses->addresses); + gpr_free(addresses); +} + +static void* lb_addresses_copy(void* addresses) { + return grpc_lb_addresses_copy(static_cast<grpc_lb_addresses*>(addresses)); +} +static void lb_addresses_destroy(void* addresses) { + grpc_lb_addresses_destroy(static_cast<grpc_lb_addresses*>(addresses)); +} +static int lb_addresses_cmp(void* addresses1, void* addresses2) { + return grpc_lb_addresses_cmp(static_cast<grpc_lb_addresses*>(addresses1), + static_cast<grpc_lb_addresses*>(addresses2)); +} +static const grpc_arg_pointer_vtable lb_addresses_arg_vtable = { + lb_addresses_copy, lb_addresses_destroy, lb_addresses_cmp}; + +grpc_arg grpc_lb_addresses_create_channel_arg( + const grpc_lb_addresses* addresses) { + return grpc_channel_arg_pointer_create( + (char*)GRPC_ARG_LB_ADDRESSES, (void*)addresses, &lb_addresses_arg_vtable); +} + +grpc_lb_addresses* grpc_lb_addresses_find_channel_arg( + const grpc_channel_args* channel_args) { + const grpc_arg* lb_addresses_arg = + grpc_channel_args_find(channel_args, GRPC_ARG_LB_ADDRESSES); + if (lb_addresses_arg == nullptr || lb_addresses_arg->type != GRPC_ARG_POINTER) + return nullptr; + return static_cast<grpc_lb_addresses*>(lb_addresses_arg->value.pointer.p); +} + +bool grpc_lb_addresses_contains_balancer_address( + const grpc_lb_addresses& addresses) { + for (size_t i = 0; i < addresses.num_addresses; ++i) { + if (addresses.addresses[i].is_balancer) return true; + } + return false; +} |