diff options
Diffstat (limited to 'test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc')
-rw-r--r-- | test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc b/test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc new file mode 100644 index 0000000000..4dfee8cf90 --- /dev/null +++ b/test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc @@ -0,0 +1,182 @@ +/* + * + * 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 = + static_cast<grpc_resolved_addresses *>(gpr_malloc(sizeof(**addrs))); + (*addrs)->naddrs = 1; + (*addrs)->addrs = static_cast<grpc_resolved_address *>( + 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((gpr_event *)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 = static_cast<next_args *>(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 = static_cast<next_args *>(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); +} |