| /* |
| * |
| * Copyright 2015-2016 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 <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/host_port.h> |
| #include <grpc/support/port_platform.h> |
| #include <grpc/support/string_util.h> |
| |
| #include "src/core/ext/filters/client_channel/lb_policy_factory.h" |
| #include "src/core/ext/filters/client_channel/parse_address.h" |
| #include "src/core/ext/filters/client_channel/resolver_registry.h" |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/iomgr/combiner.h" |
| #include "src/core/lib/iomgr/resolve_address.h" |
| #include "src/core/lib/iomgr/unix_sockets_posix.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/slice/slice_string_helpers.h" |
| #include "src/core/lib/support/string.h" |
| |
| typedef struct { |
| /** base class: must be first */ |
| grpc_resolver base; |
| /** the addresses that we've 'resolved' */ |
| grpc_lb_addresses *addresses; |
| /** channel args */ |
| grpc_channel_args *channel_args; |
| /** have we published? */ |
| bool published; |
| /** pending next completion, or NULL */ |
| grpc_closure *next_completion; |
| /** target result address for next completion */ |
| grpc_channel_args **target_result; |
| } sockaddr_resolver; |
| |
| static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *r); |
| |
| static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, |
| sockaddr_resolver *r); |
| |
| static void sockaddr_shutdown_locked(grpc_exec_ctx *exec_ctx, grpc_resolver *r); |
| static void sockaddr_channel_saw_error_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *r); |
| static void sockaddr_next_locked(grpc_exec_ctx *exec_ctx, grpc_resolver *r, |
| grpc_channel_args **target_result, |
| grpc_closure *on_complete); |
| |
| static const grpc_resolver_vtable sockaddr_resolver_vtable = { |
| sockaddr_destroy, sockaddr_shutdown_locked, |
| sockaddr_channel_saw_error_locked, sockaddr_next_locked}; |
| |
| static void sockaddr_shutdown_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| if (r->next_completion != NULL) { |
| *r->target_result = NULL; |
| GRPC_CLOSURE_SCHED( |
| exec_ctx, r->next_completion, |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown")); |
| r->next_completion = NULL; |
| } |
| } |
| |
| static void sockaddr_channel_saw_error_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| r->published = false; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| } |
| |
| static void sockaddr_next_locked(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver, |
| grpc_channel_args **target_result, |
| grpc_closure *on_complete) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| GPR_ASSERT(!r->next_completion); |
| r->next_completion = on_complete; |
| r->target_result = target_result; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| } |
| |
| static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, |
| sockaddr_resolver *r) { |
| if (r->next_completion != NULL && !r->published) { |
| r->published = true; |
| grpc_arg arg = grpc_lb_addresses_create_channel_arg(r->addresses); |
| *r->target_result = |
| grpc_channel_args_copy_and_add(r->channel_args, &arg, 1); |
| GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE); |
| r->next_completion = NULL; |
| } |
| } |
| |
| static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) { |
| sockaddr_resolver *r = (sockaddr_resolver *)gr; |
| grpc_lb_addresses_destroy(exec_ctx, r->addresses); |
| grpc_channel_args_destroy(exec_ctx, r->channel_args); |
| gpr_free(r); |
| } |
| |
| static char *ip_get_default_authority(grpc_uri *uri) { |
| const char *path = uri->path; |
| if (path[0] == '/') ++path; |
| return gpr_strdup(path); |
| } |
| |
| static char *ipv4_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return ip_get_default_authority(uri); |
| } |
| |
| static char *ipv6_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return ip_get_default_authority(uri); |
| } |
| |
| #ifdef GRPC_HAVE_UNIX_SOCKET |
| char *unix_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return gpr_strdup("localhost"); |
| } |
| #endif |
| |
| static void do_nothing(void *ignored) {} |
| |
| static grpc_resolver *sockaddr_create(grpc_exec_ctx *exec_ctx, |
| grpc_resolver_args *args, |
| bool parse(const grpc_uri *uri, |
| grpc_resolved_address *dst)) { |
| if (0 != strcmp(args->uri->authority, "")) { |
| gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme", |
| args->uri->scheme); |
| return NULL; |
| } |
| /* Construct addresses. */ |
| grpc_slice path_slice = |
| grpc_slice_new(args->uri->path, strlen(args->uri->path), do_nothing); |
| grpc_slice_buffer path_parts; |
| grpc_slice_buffer_init(&path_parts); |
| grpc_slice_split(path_slice, ",", &path_parts); |
| grpc_lb_addresses *addresses = |
| grpc_lb_addresses_create(path_parts.count, NULL /* user_data_vtable */); |
| bool errors_found = false; |
| for (size_t i = 0; i < addresses->num_addresses; i++) { |
| grpc_uri ith_uri = *args->uri; |
| char *part_str = grpc_slice_to_c_string(path_parts.slices[i]); |
| ith_uri.path = part_str; |
| if (!parse(&ith_uri, &addresses->addresses[i].address)) { |
| errors_found = true; /* GPR_TRUE */ |
| } |
| gpr_free(part_str); |
| if (errors_found) break; |
| } |
| grpc_slice_buffer_destroy_internal(exec_ctx, &path_parts); |
| grpc_slice_unref_internal(exec_ctx, path_slice); |
| if (errors_found) { |
| grpc_lb_addresses_destroy(exec_ctx, addresses); |
| return NULL; |
| } |
| /* Instantiate resolver. */ |
| sockaddr_resolver *r = |
| (sockaddr_resolver *)gpr_zalloc(sizeof(sockaddr_resolver)); |
| r->addresses = addresses; |
| r->channel_args = grpc_channel_args_copy(args->args); |
| grpc_resolver_init(&r->base, &sockaddr_resolver_vtable, args->combiner); |
| return &r->base; |
| } |
| |
| /* |
| * FACTORY |
| */ |
| |
| static void sockaddr_factory_ref(grpc_resolver_factory *factory) {} |
| |
| static void sockaddr_factory_unref(grpc_resolver_factory *factory) {} |
| |
| #define DECL_FACTORY(name) \ |
| static grpc_resolver *name##_factory_create_resolver( \ |
| grpc_exec_ctx *exec_ctx, grpc_resolver_factory *factory, \ |
| grpc_resolver_args *args) { \ |
| return sockaddr_create(exec_ctx, args, grpc_parse_##name); \ |
| } \ |
| static const grpc_resolver_factory_vtable name##_factory_vtable = { \ |
| sockaddr_factory_ref, sockaddr_factory_unref, \ |
| name##_factory_create_resolver, name##_get_default_authority, #name}; \ |
| static grpc_resolver_factory name##_resolver_factory = { \ |
| &name##_factory_vtable} |
| |
| #ifdef GRPC_HAVE_UNIX_SOCKET |
| DECL_FACTORY(unix); |
| #endif |
| DECL_FACTORY(ipv4); |
| DECL_FACTORY(ipv6); |
| |
| extern "C" void grpc_resolver_sockaddr_init(void) { |
| grpc_register_resolver_type(&ipv4_resolver_factory); |
| grpc_register_resolver_type(&ipv6_resolver_factory); |
| #ifdef GRPC_HAVE_UNIX_SOCKET |
| grpc_register_resolver_type(&unix_resolver_factory); |
| #endif |
| } |
| |
| extern "C" void grpc_resolver_sockaddr_shutdown(void) {} |