static void dns_on_resolved(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) { dns_resolver *r = arg; grpc_channel_args *result = NULL; gpr_mu_lock(&r->mu); GPR_ASSERT(r->resolving); r->resolving = false; if (r->addresses != NULL) { grpc_lb_addresses *addresses = grpc_lb_addresses_create( r->addresses->naddrs, NULL /* user_data_vtable */); for (size_t i = 0; i < r->addresses->naddrs; ++i) { grpc_lb_addresses_set_address( addresses, i, &r->addresses->addrs[i].addr, r->addresses->addrs[i].len, false /* is_balancer */, NULL /* balancer_name */, NULL /* user_data */); } grpc_arg new_arg = grpc_lb_addresses_create_channel_arg(addresses); result = grpc_channel_args_copy_and_add(r->channel_args, &new_arg, 1); grpc_resolved_addresses_destroy(r->addresses); grpc_lb_addresses_destroy(addresses); } else { gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); gpr_timespec next_try = gpr_backoff_step(&r->backoff_state, now); gpr_timespec timeout = gpr_time_sub(next_try, now); const char *msg = grpc_error_string(error); gpr_log(GPR_DEBUG, "dns resolution failed: %s", msg); grpc_error_free_string(msg); GPR_ASSERT(!r->have_retry_timer); r->have_retry_timer = true; GRPC_RESOLVER_REF(&r->base, "retry-timer"); if (gpr_time_cmp(timeout, gpr_time_0(timeout.clock_type)) > 0) { gpr_log(GPR_DEBUG, "retrying in %" PRId64 ".%09d seconds", timeout.tv_sec, timeout.tv_nsec); } else { gpr_log(GPR_DEBUG, "retrying immediately"); } grpc_timer_init(exec_ctx, &r->retry_timer, next_try, dns_on_retry_timer, r, now); } if (r->resolved_result != NULL) { grpc_channel_args_destroy(r->resolved_result); } r->resolved_result = result; r->resolved_version++; dns_maybe_finish_next_locked(exec_ctx, r); gpr_mu_unlock(&r->mu); GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "dns-resolving"); }
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; }