test/core/client_channel/resolvers/fake_resolver_test.cc - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2017 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/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>

 #include "src/core/ext/filters/client_channel/lb_policy_factory.h"
 #include "src/core/ext/filters/client_channel/parse_address.h"
 #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h"
 #include "src/core/ext/filters/client_channel/resolver_registry.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/gprpp/ref_counted_ptr.h"
 #include "src/core/lib/iomgr/combiner.h"
 #include "src/core/lib/security/credentials/fake/fake_credentials.h"

 #include "test/core/util/test_config.h"

 static grpc_core::OrphanablePtr<grpc_core::Resolver> build_fake_resolver(
     grpc_combiner* combiner,
     grpc_core::FakeResolverResponseGenerator* response_generator) {
   grpc_core::ResolverFactory* factory =
       grpc_core::ResolverRegistry::LookupResolverFactory("fake");
   grpc_arg generator_arg =
       grpc_core::FakeResolverResponseGenerator::MakeChannelArg(
           response_generator);
   grpc_channel_args channel_args = {1, &generator_arg};
   grpc_core::ResolverArgs args;
   args.args = &channel_args;
   args.combiner = combiner;
   grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
       factory->CreateResolver(args);
   return resolver;
 }

 typedef struct on_resolution_arg {
   grpc_channel_args* resolver_result;
   grpc_channel_args* expected_resolver_result;
   gpr_event ev;
 } on_resolution_arg;

 // Callback to check the resolution result is as expected.
 void on_resolution_cb(void* arg, grpc_error* error) {
   if (error != GRPC_ERROR_NONE) return;
   on_resolution_arg* res = static_cast<on_resolution_arg*>(arg);
   // We only check the addresses channel arg because that's the only one
   // explicitly set by the test via
   // FakeResolverResponseGenerator::SetResponse().
   const grpc_lb_addresses* actual_lb_addresses =
       grpc_lb_addresses_find_channel_arg(res->resolver_result);
   const grpc_lb_addresses* expected_lb_addresses =
       grpc_lb_addresses_find_channel_arg(res->expected_resolver_result);
   GPR_ASSERT(
       grpc_lb_addresses_cmp(actual_lb_addresses, expected_lb_addresses) == 0);
   grpc_channel_args_destroy(res->resolver_result);
   grpc_channel_args_destroy(res->expected_resolver_result);
   gpr_event_set(&res->ev, (void*)1);
 }

 // Create a new resolution containing 2 addresses.
 static grpc_channel_args* create_new_resolver_result() {
   static size_t test_counter = 0;
   const size_t num_addresses = 2;
   char* uri_string;
   char* balancer_name;
   // Create grpc_lb_addresses.
   grpc_lb_addresses* addresses =
       grpc_lb_addresses_create(num_addresses, nullptr);
   for (size_t i = 0; i < num_addresses; ++i) {
     gpr_asprintf(&uri_string, "ipv4:127.0.0.1:100%" PRIuPTR,
                  test_counter * num_addresses + i);
     grpc_uri* uri = grpc_uri_parse(uri_string, true);
     gpr_asprintf(&balancer_name, "balancer%" PRIuPTR,
                  test_counter * num_addresses + i);
     grpc_lb_addresses_set_address_from_uri(
         addresses, i, uri, bool(num_addresses % 2), balancer_name, nullptr);
     gpr_free(balancer_name);
     grpc_uri_destroy(uri);
     gpr_free(uri_string);
   }
   // Convert grpc_lb_addresses to grpc_channel_args.
   const grpc_arg addresses_arg =
       grpc_lb_addresses_create_channel_arg(addresses);
   grpc_channel_args* results =
       grpc_channel_args_copy_and_add(nullptr, &addresses_arg, 1);
   grpc_lb_addresses_destroy(addresses);
   ++test_counter;
   return results;
 }

 static on_resolution_arg create_on_resolution_arg(grpc_channel_args* results) {
   on_resolution_arg on_res_arg;
   memset(&on_res_arg, 0, sizeof(on_res_arg));
   on_res_arg.expected_resolver_result = results;
   gpr_event_init(&on_res_arg.ev);
   return on_res_arg;
 }

 static void test_fake_resolver() {
   grpc_core::ExecCtx exec_ctx;
   grpc_combiner* combiner = grpc_combiner_create();
   // Create resolver.
   grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator>
       response_generator =
           grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
   grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
       build_fake_resolver(combiner, response_generator.get());
   GPR_ASSERT(resolver.get() != nullptr);
   // Test 1: normal resolution.
   // next_results != NULL, reresolution_results == NULL, last_used_results ==
   // NULL. Expected response is next_results.
   grpc_channel_args* results = create_new_resolver_result();
   on_resolution_arg on_res_arg = create_on_resolution_arg(results);
   grpc_closure* on_resolution = GRPC_CLOSURE_CREATE(
       on_resolution_cb, &on_res_arg, grpc_combiner_scheduler(combiner));
   // Resolution won't be triggered until next_results is set.
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   response_generator->SetResponse(results);
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 2: update resolution.
   // next_results != NULL, reresolution_results == NULL, last_used_results !=
   // NULL. Expected response is next_results.
   results = create_new_resolver_result();
   grpc_channel_args* last_used_results = grpc_channel_args_copy(results);
   on_res_arg = create_on_resolution_arg(results);
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   // Resolution won't be triggered until next_results is set.
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   response_generator->SetResponse(results);
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 3: fallback re-resolution.
   // next_results == NULL, reresolution_results == NULL, last_used_results !=
   // NULL. Expected response is last_used_results.
   on_res_arg = create_on_resolution_arg(last_used_results);
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   // Trigger a re-resolution.
   resolver->RequestReresolutionLocked();
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 4: normal re-resolution.
   // next_results == NULL, reresolution_results != NULL, last_used_results !=
   // NULL. Expected response is reresolution_results.
   grpc_channel_args* reresolution_results = create_new_resolver_result();
   on_res_arg =
       create_on_resolution_arg(grpc_channel_args_copy(reresolution_results));
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   // Set reresolution_results.
   response_generator->SetReresolutionResponse(reresolution_results);
   // Flush here to guarantee that the response has been set.
   grpc_core::ExecCtx::Get()->Flush();
   // Trigger a re-resolution.
   resolver->RequestReresolutionLocked();
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 5: repeat re-resolution.
   // next_results == NULL, reresolution_results != NULL, last_used_results !=
   // NULL. Expected response is reresolution_results.
   on_res_arg = create_on_resolution_arg(reresolution_results);
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   // Trigger a re-resolution.
   resolver->RequestReresolutionLocked();
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 6: normal resolution.
   // next_results != NULL, reresolution_results != NULL, last_used_results !=
   // NULL. Expected response is next_results.
   results = create_new_resolver_result();
   last_used_results = grpc_channel_args_copy(results);
   on_res_arg = create_on_resolution_arg(results);
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   // Resolution won't be triggered until next_results is set.
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   response_generator->SetResponse(results);
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 7: fallback re-resolution.
   // next_results == NULL, reresolution_results == NULL, last_used_results !=
   // NULL. Expected response is last_used_results.
   on_res_arg = create_on_resolution_arg(last_used_results);
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   // Reset reresolution_results.
   response_generator->SetReresolutionResponse(nullptr);
   // Flush here to guarantee that reresolution_results has been reset.
   grpc_core::ExecCtx::Get()->Flush();
   // Trigger a re-resolution.
   resolver->RequestReresolutionLocked();
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_seconds_to_deadline(5)) != nullptr);
   // Test 8: no-op.
   // Requesting a new resolution without setting the response shouldn't trigger
   // the resolution callback.
   memset(&on_res_arg, 0, sizeof(on_res_arg));
   on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
                                       grpc_combiner_scheduler(combiner));
   resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
   grpc_core::ExecCtx::Get()->Flush();
   GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
                             grpc_timeout_milliseconds_to_deadline(100)) ==
              nullptr);
   // Clean up.
   GRPC_COMBINER_UNREF(combiner, "test_fake_resolver");
 }

 int main(int argc, char** argv) {
   grpc_test_init(argc, argv);
   grpc_init();

   test_fake_resolver();

   grpc_shutdown();
   return 0;
 }
	/*
	*
	* Copyright 2017 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/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/string_util.h>

	#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
	#include "src/core/ext/filters/client_channel/parse_address.h"
	#include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h"
	#include "src/core/ext/filters/client_channel/resolver_registry.h"
	#include "src/core/lib/channel/channel_args.h"
	#include "src/core/lib/gprpp/ref_counted_ptr.h"
	#include "src/core/lib/iomgr/combiner.h"
	#include "src/core/lib/security/credentials/fake/fake_credentials.h"

	#include "test/core/util/test_config.h"

	static grpc_core::OrphanablePtr<grpc_core::Resolver> build_fake_resolver(
	grpc_combiner* combiner,
	grpc_core::FakeResolverResponseGenerator* response_generator) {
	grpc_core::ResolverFactory* factory =
	grpc_core::ResolverRegistry::LookupResolverFactory("fake");
	grpc_arg generator_arg =
	grpc_core::FakeResolverResponseGenerator::MakeChannelArg(
	response_generator);
	grpc_channel_args channel_args = {1, &generator_arg};
	grpc_core::ResolverArgs args;
	args.args = &channel_args;
	args.combiner = combiner;
	grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
	factory->CreateResolver(args);
	return resolver;
	}

	typedef struct on_resolution_arg {
	grpc_channel_args* resolver_result;
	grpc_channel_args* expected_resolver_result;
	gpr_event ev;
	} on_resolution_arg;

	// Callback to check the resolution result is as expected.
	void on_resolution_cb(void* arg, grpc_error* error) {
	if (error != GRPC_ERROR_NONE) return;
	on_resolution_arg* res = static_cast<on_resolution_arg*>(arg);
	// We only check the addresses channel arg because that's the only one
	// explicitly set by the test via
	// FakeResolverResponseGenerator::SetResponse().
	const grpc_lb_addresses* actual_lb_addresses =
	grpc_lb_addresses_find_channel_arg(res->resolver_result);
	const grpc_lb_addresses* expected_lb_addresses =
	grpc_lb_addresses_find_channel_arg(res->expected_resolver_result);
	GPR_ASSERT(
	grpc_lb_addresses_cmp(actual_lb_addresses, expected_lb_addresses) == 0);
	grpc_channel_args_destroy(res->resolver_result);
	grpc_channel_args_destroy(res->expected_resolver_result);
	gpr_event_set(&res->ev, (void*)1);
	}

	// Create a new resolution containing 2 addresses.
	static grpc_channel_args* create_new_resolver_result() {
	static size_t test_counter = 0;
	const size_t num_addresses = 2;
	char* uri_string;
	char* balancer_name;
	// Create grpc_lb_addresses.
	grpc_lb_addresses* addresses =
	grpc_lb_addresses_create(num_addresses, nullptr);
	for (size_t i = 0; i < num_addresses; ++i) {
	gpr_asprintf(&uri_string, "ipv4:127.0.0.1:100%" PRIuPTR,
	test_counter * num_addresses + i);
	grpc_uri* uri = grpc_uri_parse(uri_string, true);
	gpr_asprintf(&balancer_name, "balancer%" PRIuPTR,
	test_counter * num_addresses + i);
	grpc_lb_addresses_set_address_from_uri(
	addresses, i, uri, bool(num_addresses % 2), balancer_name, nullptr);
	gpr_free(balancer_name);
	grpc_uri_destroy(uri);
	gpr_free(uri_string);
	}
	// Convert grpc_lb_addresses to grpc_channel_args.
	const grpc_arg addresses_arg =
	grpc_lb_addresses_create_channel_arg(addresses);
	grpc_channel_args* results =
	grpc_channel_args_copy_and_add(nullptr, &addresses_arg, 1);
	grpc_lb_addresses_destroy(addresses);
	++test_counter;
	return results;
	}

	static on_resolution_arg create_on_resolution_arg(grpc_channel_args* results) {
	on_resolution_arg on_res_arg;
	memset(&on_res_arg, 0, sizeof(on_res_arg));
	on_res_arg.expected_resolver_result = results;
	gpr_event_init(&on_res_arg.ev);
	return on_res_arg;
	}

	static void test_fake_resolver() {
	grpc_core::ExecCtx exec_ctx;
	grpc_combiner* combiner = grpc_combiner_create();
	// Create resolver.
	grpc_core::RefCountedPtr<grpc_core::FakeResolverResponseGenerator>
	response_generator =
	grpc_core::MakeRefCounted<grpc_core::FakeResolverResponseGenerator>();
	grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
	build_fake_resolver(combiner, response_generator.get());
	GPR_ASSERT(resolver.get() != nullptr);
	// Test 1: normal resolution.
	// next_results != NULL, reresolution_results == NULL, last_used_results ==
	// NULL. Expected response is next_results.
	grpc_channel_args* results = create_new_resolver_result();
	on_resolution_arg on_res_arg = create_on_resolution_arg(results);
	grpc_closure* on_resolution = GRPC_CLOSURE_CREATE(
	on_resolution_cb, &on_res_arg, grpc_combiner_scheduler(combiner));
	// Resolution won't be triggered until next_results is set.
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	response_generator->SetResponse(results);
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 2: update resolution.
	// next_results != NULL, reresolution_results == NULL, last_used_results !=
	// NULL. Expected response is next_results.
	results = create_new_resolver_result();
	grpc_channel_args* last_used_results = grpc_channel_args_copy(results);
	on_res_arg = create_on_resolution_arg(results);
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	// Resolution won't be triggered until next_results is set.
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	response_generator->SetResponse(results);
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 3: fallback re-resolution.
	// next_results == NULL, reresolution_results == NULL, last_used_results !=
	// NULL. Expected response is last_used_results.
	on_res_arg = create_on_resolution_arg(last_used_results);
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	// Trigger a re-resolution.
	resolver->RequestReresolutionLocked();
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 4: normal re-resolution.
	// next_results == NULL, reresolution_results != NULL, last_used_results !=
	// NULL. Expected response is reresolution_results.
	grpc_channel_args* reresolution_results = create_new_resolver_result();
	on_res_arg =
	create_on_resolution_arg(grpc_channel_args_copy(reresolution_results));
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	// Set reresolution_results.
	response_generator->SetReresolutionResponse(reresolution_results);
	// Flush here to guarantee that the response has been set.
	grpc_core::ExecCtx::Get()->Flush();
	// Trigger a re-resolution.
	resolver->RequestReresolutionLocked();
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 5: repeat re-resolution.
	// next_results == NULL, reresolution_results != NULL, last_used_results !=
	// NULL. Expected response is reresolution_results.
	on_res_arg = create_on_resolution_arg(reresolution_results);
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	// Trigger a re-resolution.
	resolver->RequestReresolutionLocked();
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 6: normal resolution.
	// next_results != NULL, reresolution_results != NULL, last_used_results !=
	// NULL. Expected response is next_results.
	results = create_new_resolver_result();
	last_used_results = grpc_channel_args_copy(results);
	on_res_arg = create_on_resolution_arg(results);
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	// Resolution won't be triggered until next_results is set.
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	response_generator->SetResponse(results);
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 7: fallback re-resolution.
	// next_results == NULL, reresolution_results == NULL, last_used_results !=
	// NULL. Expected response is last_used_results.
	on_res_arg = create_on_resolution_arg(last_used_results);
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	// Reset reresolution_results.
	response_generator->SetReresolutionResponse(nullptr);
	// Flush here to guarantee that reresolution_results has been reset.
	grpc_core::ExecCtx::Get()->Flush();
	// Trigger a re-resolution.
	resolver->RequestReresolutionLocked();
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_seconds_to_deadline(5)) != nullptr);
	// Test 8: no-op.
	// Requesting a new resolution without setting the response shouldn't trigger
	// the resolution callback.
	memset(&on_res_arg, 0, sizeof(on_res_arg));
	on_resolution = GRPC_CLOSURE_CREATE(on_resolution_cb, &on_res_arg,
	grpc_combiner_scheduler(combiner));
	resolver->NextLocked(&on_res_arg.resolver_result, on_resolution);
	grpc_core::ExecCtx::Get()->Flush();
	GPR_ASSERT(gpr_event_wait(&on_res_arg.ev,
	grpc_timeout_milliseconds_to_deadline(100)) ==
	nullptr);
	// Clean up.
	GRPC_COMBINER_UNREF(combiner, "test_fake_resolver");
	}

	int main(int argc, char** argv) {
	grpc_test_init(argc, argv);
	grpc_init();

	test_fake_resolver();

	grpc_shutdown();
	return 0;
	}