| /* |
| * |
| * Copyright 2015-2016, 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 <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/client_channel/lb_policy_factory.h" |
| #include "src/core/ext/client_channel/parse_address.h" |
| #include "src/core/ext/client_channel/resolver_registry.h" |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/iomgr/resolve_address.h" |
| #include "src/core/lib/iomgr/unix_sockets_posix.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; |
| /** mutex guarding the rest of the state */ |
| gpr_mu mu; |
| /** 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(grpc_exec_ctx *exec_ctx, grpc_resolver *r); |
| static void sockaddr_channel_saw_error(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *r); |
| static void sockaddr_next(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, sockaddr_channel_saw_error, |
| sockaddr_next}; |
| |
| static void sockaddr_shutdown(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| if (r->next_completion != NULL) { |
| *r->target_result = NULL; |
| grpc_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL); |
| r->next_completion = NULL; |
| } |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| static void sockaddr_channel_saw_error(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| r->published = false; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| static void sockaddr_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_channel_args **target_result, |
| grpc_closure *on_complete) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| GPR_ASSERT(!r->next_completion); |
| r->next_completion = on_complete; |
| r->target_result = target_result; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| 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_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL); |
| r->next_completion = NULL; |
| } |
| } |
| |
| static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) { |
| sockaddr_resolver *r = (sockaddr_resolver *)gr; |
| gpr_mu_destroy(&r->mu); |
| grpc_lb_addresses_destroy(r->addresses); |
| grpc_channel_args_destroy(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_resolver_args *args, |
| int parse(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. */ |
| gpr_slice path_slice = |
| gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing); |
| gpr_slice_buffer path_parts; |
| gpr_slice_buffer_init(&path_parts); |
| gpr_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 = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII); |
| 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; |
| } |
| gpr_slice_buffer_destroy(&path_parts); |
| gpr_slice_unref(path_slice); |
| if (errors_found) { |
| grpc_lb_addresses_destroy(addresses); |
| return NULL; |
| } |
| /* Instantiate resolver. */ |
| sockaddr_resolver *r = gpr_malloc(sizeof(sockaddr_resolver)); |
| memset(r, 0, sizeof(*r)); |
| r->addresses = addresses; |
| grpc_arg server_name_arg; |
| server_name_arg.type = GRPC_ARG_STRING; |
| server_name_arg.key = GRPC_ARG_SERVER_NAME; |
| server_name_arg.value.string = args->uri->path; |
| r->channel_args = |
| grpc_channel_args_copy_and_add(args->args, &server_name_arg, 1); |
| gpr_mu_init(&r->mu); |
| grpc_resolver_init(&r->base, &sockaddr_resolver_vtable); |
| 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_resolver_factory *factory, grpc_resolver_args *args) { \ |
| return sockaddr_create(args, 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); |
| |
| 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 |
| } |
| |
| void grpc_resolver_sockaddr_shutdown(void) {} |