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/*
*
* 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/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/ext/filters/client_channel/server_address.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_core::ServerAddressList* actual_addresses =
grpc_core::FindServerAddressListChannelArg(res->resolver_result);
const grpc_core::ServerAddressList* expected_addresses =
grpc_core::FindServerAddressListChannelArg(res->expected_resolver_result);
GPR_ASSERT(actual_addresses->size() == expected_addresses->size());
for (size_t i = 0; i < expected_addresses->size(); ++i) {
GPR_ASSERT((*actual_addresses)[i] == (*expected_addresses)[i]);
}
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 address list.
grpc_core::ServerAddressList addresses;
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_resolved_address address;
GPR_ASSERT(grpc_parse_uri(uri, &address));
grpc_core::InlinedVector<grpc_arg, 2> args_to_add;
const bool is_balancer = num_addresses % 2;
if (is_balancer) {
args_to_add.emplace_back(grpc_channel_arg_integer_create(
const_cast<char*>(GRPC_ARG_ADDRESS_IS_BALANCER), 1));
args_to_add.emplace_back(grpc_channel_arg_string_create(
const_cast<char*>(GRPC_ARG_ADDRESS_BALANCER_NAME), balancer_name));
}
grpc_channel_args* args = grpc_channel_args_copy_and_add(
nullptr, args_to_add.data(), args_to_add.size());
addresses.emplace_back(address.addr, address.len, args);
gpr_free(balancer_name);
grpc_uri_destroy(uri);
gpr_free(uri_string);
}
// Embed the address list in channel args.
const grpc_arg addresses_arg = CreateServerAddressListChannelArg(&addresses);
grpc_channel_args* results =
grpc_channel_args_copy_and_add(nullptr, &addresses_arg, 1);
++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.
// 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.
// Expected response is next_results.
results = create_new_resolver_result();
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: normal re-resolution.
// next_results == NULL, reresolution_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 4: repeat re-resolution.
// next_results == NULL, reresolution_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 5: normal resolution.
// next_results != NULL, reresolution_results != NULL.
// Expected response is next_results.
results = create_new_resolver_result();
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 6: 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.
// Note: Need to explicitly unref the resolver and flush the exec_ctx
// to make sure that the final resolver callback (with error set to
// "Resolver Shutdown") is invoked before on_res_arg goes out of scope.
resolver.reset();
grpc_core::ExecCtx::Get()->Flush();
GRPC_COMBINER_UNREF(combiner, "test_fake_resolver");
}
int main(int argc, char** argv) {
grpc::testing::TestEnvironment env(argc, argv);
grpc_init();
test_fake_resolver();
grpc_shutdown();
return 0;
}
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