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 | 177 |
1 files changed, 177 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..e2823a4501 --- /dev/null +++ b/test/core/client_channel/resolvers/dns_resolver_connectivity_test.cc @@ -0,0 +1,177 @@ +/* + * + * 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(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(on_done, error); +} + +static grpc_ares_request* my_dns_lookup_ares( + 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(on_done, error); + return NULL; +} + +static grpc_resolver* create_resolver(const char* name) { + grpc_resolver_factory* factory = grpc_resolver_factory_lookup("dns"); + grpc_uri* uri = grpc_uri_parse(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(factory, &args); + grpc_resolver_factory_unref(factory); + grpc_uri_destroy(uri); + return resolver; +} + +static void on_done(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--; + + ExecCtx _local_exec_ctx; + grpc_timer_check(NULL); + grpc_exec_ctx_finish(); + } + 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(void* arg, + grpc_error* error_unused) { + next_args* a = static_cast<next_args*>(arg); + grpc_resolver_next_locked(a->resolver, a->result, a->on_complete); + gpr_free(a); +} + +static void call_resolver_next_after_locking(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( + 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; + + ExecCtx _local_exec_ctx; + grpc_resolver* resolver = create_resolver("dns:test"); + gpr_event ev1; + gpr_event_init(&ev1); + call_resolver_next_after_locking( + resolver, &result, + GRPC_CLOSURE_CREATE(on_done, &ev1, grpc_schedule_on_exec_ctx)); + grpc_exec_ctx_flush(); + GPR_ASSERT(wait_loop(5, &ev1)); + GPR_ASSERT(result == NULL); + + gpr_event ev2; + gpr_event_init(&ev2); + call_resolver_next_after_locking( + resolver, &result, + GRPC_CLOSURE_CREATE(on_done, &ev2, grpc_schedule_on_exec_ctx)); + grpc_exec_ctx_flush(); + GPR_ASSERT(wait_loop(30, &ev2)); + GPR_ASSERT(result != NULL); + + grpc_channel_args_destroy(result); + GRPC_RESOLVER_UNREF(resolver, "test"); + GRPC_COMBINER_UNREF(g_combiner, "test"); + grpc_exec_ctx_finish(); + + grpc_shutdown(); + gpr_mu_destroy(&g_mu); +} |