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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 <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_address_resolver_vtable test_resolver = {my_resolve_address,
nullptr};
static grpc_ares_request* my_dns_lookup_ares_locked(
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,
grpc_combiner* combiner) {
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, nullptr);
grpc_lb_addresses_set_address(*lb_addrs, 0, nullptr, 0, false, nullptr,
nullptr);
}
GRPC_CLOSURE_SCHED(on_done, error);
return nullptr;
}
static void my_cancel_ares_request_locked(grpc_ares_request* request) {
GPR_ASSERT(request == nullptr);
}
static grpc_core::OrphanablePtr<grpc_core::Resolver> create_resolver(
const char* name) {
grpc_core::ResolverFactory* factory =
grpc_core::ResolverRegistry::LookupResolverFactory("dns");
grpc_uri* uri = grpc_uri_parse(name, 0);
GPR_ASSERT(uri);
grpc_core::ResolverArgs args;
args.uri = uri;
args.combiner = g_combiner;
grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
factory->CreateResolver(args);
grpc_uri_destroy(uri);
return resolver;
}
static void on_done(void* ev, grpc_error* error) {
gpr_event_set(static_cast<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_core::ExecCtx exec_ctx;
grpc_timer_check(nullptr);
}
return false;
}
typedef struct next_args {
grpc_core::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);
a->resolver->NextLocked(a->result, a->on_complete);
gpr_free(a);
}
static void call_resolver_next_after_locking(grpc_core::Resolver* resolver,
grpc_channel_args** result,
grpc_closure* on_complete,
grpc_combiner* combiner) {
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(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_set_resolver_impl(&test_resolver);
grpc_dns_lookup_ares_locked = my_dns_lookup_ares_locked;
grpc_cancel_ares_request_locked = my_cancel_ares_request_locked;
grpc_channel_args* result = (grpc_channel_args*)1;
{
grpc_core::ExecCtx exec_ctx;
grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
create_resolver("dns:test");
gpr_event ev1;
gpr_event_init(&ev1);
call_resolver_next_after_locking(
resolver.get(), &result,
GRPC_CLOSURE_CREATE(on_done, &ev1, grpc_schedule_on_exec_ctx),
g_combiner);
grpc_core::ExecCtx::Get()->Flush();
GPR_ASSERT(wait_loop(5, &ev1));
GPR_ASSERT(result == nullptr);
gpr_event ev2;
gpr_event_init(&ev2);
call_resolver_next_after_locking(
resolver.get(), &result,
GRPC_CLOSURE_CREATE(on_done, &ev2, grpc_schedule_on_exec_ctx),
g_combiner);
grpc_core::ExecCtx::Get()->Flush();
GPR_ASSERT(wait_loop(30, &ev2));
GPR_ASSERT(result != nullptr);
grpc_channel_args_destroy(result);
GRPC_COMBINER_UNREF(g_combiner, "test");
}
grpc_shutdown();
gpr_mu_destroy(&g_mu);
}
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