| /* |
| * |
| * 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 <string.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| |
| #include "src/core/ext/filters/client_channel/lb_policy_factory.h" |
| #include "src/core/ext/filters/client_channel/resolver.h" |
| #include "src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.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/timer.h" |
| #include "test/core/util/test_config.h" |
| |
| static gpr_mu g_mu; |
| static bool g_fail_resolution = true; |
| static grpc_combiner *g_combiner; |
| |
| static void my_resolve_address(grpc_exec_ctx *exec_ctx, const char *addr, |
| const char *default_port, |
| grpc_pollset_set *interested_parties, |
| grpc_closure *on_done, |
| grpc_resolved_addresses **addrs) { |
| gpr_mu_lock(&g_mu); |
| GPR_ASSERT(0 == strcmp("test", addr)); |
| grpc_error *error = GRPC_ERROR_NONE; |
| if (g_fail_resolution) { |
| g_fail_resolution = false; |
| gpr_mu_unlock(&g_mu); |
| error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Forced Failure"); |
| } else { |
| gpr_mu_unlock(&g_mu); |
| *addrs = gpr_malloc(sizeof(**addrs)); |
| (*addrs)->naddrs = 1; |
| (*addrs)->addrs = gpr_malloc(sizeof(*(*addrs)->addrs)); |
| (*addrs)->addrs[0].len = 123; |
| } |
| GRPC_CLOSURE_SCHED(exec_ctx, on_done, error); |
| } |
| |
| static grpc_ares_request *my_dns_lookup_ares( |
| grpc_exec_ctx *exec_ctx, const char *dns_server, const char *addr, |
| const char *default_port, grpc_pollset_set *interested_parties, |
| grpc_closure *on_done, grpc_lb_addresses **lb_addrs, bool check_grpclb, |
| char **service_config_json) { |
| gpr_mu_lock(&g_mu); |
| GPR_ASSERT(0 == strcmp("test", addr)); |
| grpc_error *error = GRPC_ERROR_NONE; |
| if (g_fail_resolution) { |
| g_fail_resolution = false; |
| gpr_mu_unlock(&g_mu); |
| error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Forced Failure"); |
| } else { |
| gpr_mu_unlock(&g_mu); |
| *lb_addrs = grpc_lb_addresses_create(1, NULL); |
| grpc_lb_addresses_set_address(*lb_addrs, 0, NULL, 0, false, NULL, NULL); |
| } |
| GRPC_CLOSURE_SCHED(exec_ctx, on_done, error); |
| return NULL; |
| } |
| |
| static grpc_resolver *create_resolver(grpc_exec_ctx *exec_ctx, |
| const char *name) { |
| grpc_resolver_factory *factory = grpc_resolver_factory_lookup("dns"); |
| grpc_uri *uri = grpc_uri_parse(exec_ctx, name, 0); |
| GPR_ASSERT(uri); |
| grpc_resolver_args args; |
| memset(&args, 0, sizeof(args)); |
| args.uri = uri; |
| args.combiner = g_combiner; |
| grpc_resolver *resolver = |
| grpc_resolver_factory_create_resolver(exec_ctx, factory, &args); |
| grpc_resolver_factory_unref(factory); |
| grpc_uri_destroy(uri); |
| return resolver; |
| } |
| |
| static void on_done(grpc_exec_ctx *exec_ctx, void *ev, grpc_error *error) { |
| gpr_event_set(ev, (void *)1); |
| } |
| |
| // interleave waiting for an event with a timer check |
| static bool wait_loop(int deadline_seconds, gpr_event *ev) { |
| while (deadline_seconds) { |
| gpr_log(GPR_DEBUG, "Test: waiting for %d more seconds", deadline_seconds); |
| if (gpr_event_wait(ev, grpc_timeout_seconds_to_deadline(1))) return true; |
| deadline_seconds--; |
| |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_timer_check(&exec_ctx, NULL); |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |
| return false; |
| } |
| |
| typedef struct next_args { |
| grpc_resolver *resolver; |
| grpc_channel_args **result; |
| grpc_closure *on_complete; |
| } next_args; |
| |
| static void call_resolver_next_now_lock_taken(grpc_exec_ctx *exec_ctx, |
| void *arg, |
| grpc_error *error_unused) { |
| next_args *a = arg; |
| grpc_resolver_next_locked(exec_ctx, a->resolver, a->result, a->on_complete); |
| gpr_free(a); |
| } |
| |
| static void call_resolver_next_after_locking(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver, |
| grpc_channel_args **result, |
| grpc_closure *on_complete) { |
| next_args *a = gpr_malloc(sizeof(*a)); |
| a->resolver = resolver; |
| a->result = result; |
| a->on_complete = on_complete; |
| GRPC_CLOSURE_SCHED(exec_ctx, GRPC_CLOSURE_CREATE( |
| call_resolver_next_now_lock_taken, a, |
| grpc_combiner_scheduler(resolver->combiner)), |
| GRPC_ERROR_NONE); |
| } |
| |
| int main(int argc, char **argv) { |
| grpc_test_init(argc, argv); |
| |
| grpc_init(); |
| gpr_mu_init(&g_mu); |
| g_combiner = grpc_combiner_create(); |
| grpc_resolve_address = my_resolve_address; |
| grpc_dns_lookup_ares = my_dns_lookup_ares; |
| grpc_channel_args *result = (grpc_channel_args *)1; |
| |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_resolver *resolver = create_resolver(&exec_ctx, "dns:test"); |
| gpr_event ev1; |
| gpr_event_init(&ev1); |
| call_resolver_next_after_locking( |
| &exec_ctx, resolver, &result, |
| GRPC_CLOSURE_CREATE(on_done, &ev1, grpc_schedule_on_exec_ctx)); |
| grpc_exec_ctx_flush(&exec_ctx); |
| GPR_ASSERT(wait_loop(5, &ev1)); |
| GPR_ASSERT(result == NULL); |
| |
| gpr_event ev2; |
| gpr_event_init(&ev2); |
| call_resolver_next_after_locking( |
| &exec_ctx, resolver, &result, |
| GRPC_CLOSURE_CREATE(on_done, &ev2, grpc_schedule_on_exec_ctx)); |
| grpc_exec_ctx_flush(&exec_ctx); |
| GPR_ASSERT(wait_loop(30, &ev2)); |
| GPR_ASSERT(result != NULL); |
| |
| grpc_channel_args_destroy(&exec_ctx, result); |
| GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "test"); |
| GRPC_COMBINER_UNREF(&exec_ctx, g_combiner, "test"); |
| grpc_exec_ctx_finish(&exec_ctx); |
| |
| grpc_shutdown(); |
| gpr_mu_destroy(&g_mu); |
| } |