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/*
*
* 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 <cstring>
#include <grpc/support/log.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/sockaddr_utils.h"
#include "test/core/util/test_config.h"
static grpc_combiner* g_combiner;
static void (*g_default_grpc_resolve_address)(
const char* name, const char* default_port,
grpc_pollset_set* interested_parties, grpc_closure* on_done,
grpc_resolved_addresses** addrs);
// Counter incremented by test_resolve_address_impl indicating the number of
// times a system-level resolution has happened.
static int g_resolution_count;
// Wrapper around g_default_grpc_resolve_address in order to count the number of
// times we incur in a system-level name resolution.
static void test_resolve_address_impl(const char* name,
const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addrs) {
g_default_grpc_resolve_address(name, default_port, interested_parties,
on_done, addrs);
++g_resolution_count;
}
static void test_succeeds(grpc_resolver_factory* factory, const char* uri_str) {
grpc_core::ExecCtx exec_ctx;
grpc_uri* uri = grpc_uri_parse(uri_str, 0);
grpc_resolver_args args;
grpc_resolver* resolver;
gpr_log(GPR_DEBUG, "test: '%s' should be valid for '%s'", uri_str,
factory->vtable->scheme);
GPR_ASSERT(uri);
memset(&args, 0, sizeof(args));
args.uri = uri;
args.combiner = g_combiner;
resolver = grpc_resolver_factory_create_resolver(factory, &args);
GPR_ASSERT(resolver != nullptr);
GRPC_RESOLVER_UNREF(resolver, "test_succeeds");
grpc_uri_destroy(uri);
}
static void test_fails(grpc_resolver_factory* factory, const char* string) {
grpc_core::ExecCtx exec_ctx;
grpc_uri* uri = grpc_uri_parse(string, 0);
grpc_resolver_args args;
grpc_resolver* resolver;
gpr_log(GPR_DEBUG, "test: '%s' should be invalid for '%s'", string,
factory->vtable->scheme);
GPR_ASSERT(uri);
memset(&args, 0, sizeof(args));
args.uri = uri;
args.combiner = g_combiner;
resolver = grpc_resolver_factory_create_resolver(factory, &args);
GPR_ASSERT(resolver == nullptr);
grpc_uri_destroy(uri);
}
typedef struct on_resolution_cb_arg {
grpc_resolver* resolver;
grpc_channel_args* result;
grpc_millis delay_before_second_resolution;
} on_resolution_cb_arg;
// Counter for the number of times a resolution notification callback has been
// invoked.
static int g_on_resolution_invocations_count;
void on_third_resolution(void* arg, grpc_error* error) {
on_resolution_cb_arg* cb_arg = static_cast<on_resolution_cb_arg*>(arg);
++g_on_resolution_invocations_count;
grpc_channel_args_destroy(cb_arg->result);
gpr_log(GPR_INFO,
"3rd: g_on_resolution_invocations_count: %d, g_resolution_count: %d",
g_on_resolution_invocations_count, g_resolution_count);
// In this case we expect to have incurred in another system-level resolution
// because on_second_resolution slept for longer than the min resolution
// period.
GPR_ASSERT(g_on_resolution_invocations_count == 3);
GPR_ASSERT(g_resolution_count == 2);
grpc_resolver_shutdown_locked(cb_arg->resolver);
GRPC_RESOLVER_UNREF(cb_arg->resolver, "on_third_resolution");
gpr_free(cb_arg);
}
void on_second_resolution(void* arg, grpc_error* error) {
on_resolution_cb_arg* cb_arg = static_cast<on_resolution_cb_arg*>(arg);
++g_on_resolution_invocations_count;
grpc_channel_args_destroy(cb_arg->result);
gpr_log(GPR_INFO,
"2nd: g_on_resolution_invocations_count: %d, g_resolution_count: %d",
g_on_resolution_invocations_count, g_resolution_count);
// The resolution request for which this function is the callback happened
// before the min resolution period. Therefore, no new system-level
// resolutions happened, as indicated by g_resolution_count.
GPR_ASSERT(g_on_resolution_invocations_count == 2);
GPR_ASSERT(g_resolution_count == 1);
grpc_resolver_next_locked(
cb_arg->resolver, &cb_arg->result,
GRPC_CLOSURE_CREATE(on_third_resolution, arg, grpc_schedule_on_exec_ctx));
grpc_resolver_channel_saw_error_locked(cb_arg->resolver);
gpr_sleep_until(grpc_timeout_milliseconds_to_deadline(
cb_arg->delay_before_second_resolution));
}
void on_first_resolution(void* arg, grpc_error* error) {
on_resolution_cb_arg* cb_arg = static_cast<on_resolution_cb_arg*>(arg);
++g_on_resolution_invocations_count;
grpc_channel_args_destroy(cb_arg->result);
grpc_resolver_next_locked(cb_arg->resolver, &cb_arg->result,
GRPC_CLOSURE_CREATE(on_second_resolution, arg,
grpc_schedule_on_exec_ctx));
grpc_resolver_channel_saw_error_locked(cb_arg->resolver);
gpr_log(GPR_INFO,
"1st: g_on_resolution_invocations_count: %d, g_resolution_count: %d",
g_on_resolution_invocations_count, g_resolution_count);
// Theres one initial system-level resolution and one invocation of a
// notification callback (the current function).
GPR_ASSERT(g_on_resolution_invocations_count == 1);
GPR_ASSERT(g_resolution_count == 1);
}
static void test_cooldown(grpc_resolver_factory* factory, const char* uri_str) {
grpc_core::ExecCtx exec_ctx;
grpc_uri* uri = grpc_uri_parse(uri_str, 0);
grpc_resolver_args args;
grpc_resolver* resolver;
gpr_log(GPR_DEBUG, "test: '%s' should be valid for '%s'", uri_str,
factory->vtable->scheme);
GPR_ASSERT(uri);
memset(&args, 0, sizeof(args));
args.uri = uri;
args.combiner = g_combiner;
g_on_resolution_invocations_count = 0;
g_resolution_count = 0;
constexpr int kMinResolutionPeriodMs = 1000;
grpc_arg cooldown_arg;
cooldown_arg.key = const_cast<char*>(GRPC_ARG_DNS_MIN_RESOLUTION_PERIOD_MS);
cooldown_arg.type = GRPC_ARG_INTEGER;
cooldown_arg.value.integer = kMinResolutionPeriodMs;
auto* cooldown_channel_args =
grpc_channel_args_copy_and_add(nullptr, &cooldown_arg, 1);
args.args = cooldown_channel_args;
resolver = grpc_resolver_factory_create_resolver(factory, &args);
grpc_channel_args_destroy(cooldown_channel_args);
GPR_ASSERT(resolver != nullptr);
on_resolution_cb_arg* arg = (on_resolution_cb_arg*)gpr_zalloc(sizeof(*arg));
arg->resolver = resolver;
arg->delay_before_second_resolution = kMinResolutionPeriodMs * 1.10;
// First resolution, would incur in system-level resolution.
grpc_resolver_next_locked(
resolver, &arg->result,
GRPC_CLOSURE_CREATE(on_first_resolution, arg, grpc_schedule_on_exec_ctx));
grpc_uri_destroy(uri);
}
int main(int argc, char** argv) {
grpc_resolver_factory* dns;
grpc_test_init(argc, argv);
grpc_init();
g_combiner = grpc_combiner_create();
g_default_grpc_resolve_address = grpc_resolve_address;
grpc_resolve_address = test_resolve_address_impl;
dns = grpc_resolver_factory_lookup("dns");
test_succeeds(dns, "dns:10.2.1.1");
test_succeeds(dns, "dns:10.2.1.1:1234");
test_succeeds(dns, "ipv4:www.google.com");
if (grpc_resolve_address == grpc_resolve_address_ares) {
test_succeeds(dns, "ipv4://8.8.8.8/8.8.8.8:8888");
} else {
test_fails(dns, "ipv4://8.8.8.8/8.8.8.8:8888");
}
test_cooldown(dns, "dns:127.0.0.1");
grpc_resolver_factory_unref(dns);
{
grpc_core::ExecCtx exec_ctx;
GRPC_COMBINER_UNREF(g_combiner, "test");
}
grpc_shutdown();
return 0;
}
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