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v811_spc009/external/grpc-grpc/test/cpp/naming/resolver_component_test.cc

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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 <grpc/support/port_platform.h>
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <gflags/gflags.h>
#include <gmock/gmock.h>
#include <thread>
#include <vector>
#include "test/cpp/util/subprocess.h"
#include "test/cpp/util/test_config.h"
#include "src/core/ext/filters/client_channel/client_channel.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/gpr/env.h"
#include "src/core/lib/gpr/host_port.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gprpp/orphanable.h"
#include "src/core/lib/iomgr/combiner.h"
#include "src/core/lib/iomgr/executor.h"
#include "src/core/lib/iomgr/iomgr.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "test/core/util/port.h"
#include "test/core/util/test_config.h"
// TODO: pull in different headers when enabling this
// test on windows. Also set BAD_SOCKET_RETURN_VAL
// to INVALID_SOCKET on windows.
#ifdef GPR_WINDOWS
#include "src/core/lib/iomgr/sockaddr_windows.h"
#include "src/core/lib/iomgr/socket_windows.h"
#include "src/core/lib/iomgr/tcp_windows.h"
#define BAD_SOCKET_RETURN_VAL INVALID_SOCKET
#else
#include "src/core/lib/iomgr/sockaddr_posix.h"
#define BAD_SOCKET_RETURN_VAL -1
#endif
using grpc::SubProcess;
using std::vector;
using testing::UnorderedElementsAreArray;
// Hack copied from "test/cpp/end2end/server_crash_test_client.cc"!
// In some distros, gflags is in the namespace google, and in some others,
// in gflags. This hack is enabling us to find both.
namespace google {}
namespace gflags {}
using namespace google;
using namespace gflags;
DEFINE_string(target_name, "", "Target name to resolve.");
DEFINE_string(expected_addrs, "",
"List of expected backend or balancer addresses in the form "
"'<ip0:port0>,<is_balancer0>;<ip1:port1>,<is_balancer1>;...'. "
"'is_balancer' should be bool, i.e. true or false.");
DEFINE_string(expected_chosen_service_config, "",
"Expected service config json string that gets chosen (no "
"whitespace). Empty for none.");
DEFINE_string(
local_dns_server_address, "",
"Optional. This address is placed as the uri authority if present.");
DEFINE_string(expected_lb_policy, "",
"Expected lb policy name that appears in resolver result channel "
"arg. Empty for none.");
namespace {
class GrpcLBAddress final {
public:
GrpcLBAddress(std::string address, bool is_balancer)
: is_balancer(is_balancer), address(std::move(address)) {}
bool operator==(const GrpcLBAddress& other) const {
return this->is_balancer == other.is_balancer &&
this->address == other.address;
}
bool operator!=(const GrpcLBAddress& other) const {
return !(*this == other);
}
bool is_balancer;
std::string address;
};
vector<GrpcLBAddress> ParseExpectedAddrs(std::string expected_addrs) {
std::vector<GrpcLBAddress> out;
while (expected_addrs.size() != 0) {
// get the next <ip>,<port> (v4 or v6)
size_t next_comma = expected_addrs.find(',');
if (next_comma == std::string::npos) {
gpr_log(GPR_ERROR,
"Missing ','. Expected_addrs arg should be a semicolon-separated "
"list of <ip-port>,<bool> pairs. Left-to-be-parsed arg is |%s|",
expected_addrs.c_str());
abort();
}
std::string next_addr = expected_addrs.substr(0, next_comma);
expected_addrs = expected_addrs.substr(next_comma + 1, std::string::npos);
// get the next is_balancer 'bool' associated with this address
size_t next_semicolon = expected_addrs.find(';');
bool is_balancer =
gpr_is_true(expected_addrs.substr(0, next_semicolon).c_str());
out.emplace_back(GrpcLBAddress(next_addr, is_balancer));
if (next_semicolon == std::string::npos) {
break;
}
expected_addrs =
expected_addrs.substr(next_semicolon + 1, std::string::npos);
}
if (out.size() == 0) {
gpr_log(GPR_ERROR,
"expected_addrs arg should be a semicolon-separated list of "
"<ip-port>,<bool> pairs");
abort();
}
return out;
}
gpr_timespec TestDeadline(void) {
return grpc_timeout_seconds_to_deadline(100);
}
struct ArgsStruct {
gpr_event ev;
gpr_atm done_atm;
gpr_mu* mu;
grpc_pollset* pollset;
grpc_pollset_set* pollset_set;
grpc_combiner* lock;
grpc_channel_args* channel_args;
vector<GrpcLBAddress> expected_addrs;
std::string expected_service_config_string;
std::string expected_lb_policy;
};
void ArgsInit(ArgsStruct* args) {
gpr_event_init(&args->ev);
args->pollset = (grpc_pollset*)gpr_zalloc(grpc_pollset_size());
grpc_pollset_init(args->pollset, &args->mu);
args->pollset_set = grpc_pollset_set_create();
grpc_pollset_set_add_pollset(args->pollset_set, args->pollset);
args->lock = grpc_combiner_create();
gpr_atm_rel_store(&args->done_atm, 0);
args->channel_args = nullptr;
}
void DoNothing(void* arg, grpc_error* error) {}
void ArgsFinish(ArgsStruct* args) {
GPR_ASSERT(gpr_event_wait(&args->ev, TestDeadline()));
grpc_pollset_set_del_pollset(args->pollset_set, args->pollset);
grpc_pollset_set_destroy(args->pollset_set);
grpc_closure DoNothing_cb;
GRPC_CLOSURE_INIT(&DoNothing_cb, DoNothing, nullptr,
grpc_schedule_on_exec_ctx);
grpc_pollset_shutdown(args->pollset, &DoNothing_cb);
// exec_ctx needs to be flushed before calling grpc_pollset_destroy()
grpc_channel_args_destroy(args->channel_args);
grpc_core::ExecCtx::Get()->Flush();
grpc_pollset_destroy(args->pollset);
gpr_free(args->pollset);
GRPC_COMBINER_UNREF(args->lock, nullptr);
}
gpr_timespec NSecondDeadline(int seconds) {
return gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
gpr_time_from_seconds(seconds, GPR_TIMESPAN));
}
void PollPollsetUntilRequestDone(ArgsStruct* args) {
gpr_timespec deadline = NSecondDeadline(10);
while (true) {
bool done = gpr_atm_acq_load(&args->done_atm) != 0;
if (done) {
break;
}
gpr_timespec time_left =
gpr_time_sub(deadline, gpr_now(GPR_CLOCK_REALTIME));
gpr_log(GPR_DEBUG, "done=%d, time_left=%" PRId64 ".%09d", done,
time_left.tv_sec, time_left.tv_nsec);
GPR_ASSERT(gpr_time_cmp(time_left, gpr_time_0(GPR_TIMESPAN)) >= 0);
grpc_pollset_worker* worker = nullptr;
grpc_core::ExecCtx exec_ctx;
gpr_mu_lock(args->mu);
GRPC_LOG_IF_ERROR("pollset_work",
grpc_pollset_work(args->pollset, &worker,
grpc_timespec_to_millis_round_up(
NSecondDeadline(1))));
gpr_mu_unlock(args->mu);
}
gpr_event_set(&args->ev, (void*)1);
}
void CheckServiceConfigResultLocked(grpc_channel_args* channel_args,
ArgsStruct* args) {
const grpc_arg* service_config_arg =
grpc_channel_args_find(channel_args, GRPC_ARG_SERVICE_CONFIG);
if (args->expected_service_config_string != "") {
GPR_ASSERT(service_config_arg != nullptr);
GPR_ASSERT(service_config_arg->type == GRPC_ARG_STRING);
EXPECT_EQ(service_config_arg->value.string,
args->expected_service_config_string);
} else {
GPR_ASSERT(service_config_arg == nullptr);
}
}
void CheckLBPolicyResultLocked(grpc_channel_args* channel_args,
ArgsStruct* args) {
const grpc_arg* lb_policy_arg =
grpc_channel_args_find(channel_args, GRPC_ARG_LB_POLICY_NAME);
if (args->expected_lb_policy != "") {
GPR_ASSERT(lb_policy_arg != nullptr);
GPR_ASSERT(lb_policy_arg->type == GRPC_ARG_STRING);
EXPECT_EQ(lb_policy_arg->value.string, args->expected_lb_policy);
} else {
GPR_ASSERT(lb_policy_arg == nullptr);
}
}
#ifdef GPR_WINDOWS
void OpenAndCloseSocketsStressLoop(int dummy_port, gpr_event* done_ev) {
sockaddr_in6 addr;
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_port = htons(dummy_port);
((char*)&addr.sin6_addr)[15] = 1;
for (;;) {
if (gpr_event_get(done_ev)) {
return;
}
std::vector<int> sockets;
for (size_t i = 0; i < 50; i++) {
SOCKET s = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, nullptr, 0,
WSA_FLAG_OVERLAPPED);
ASSERT_TRUE(s != BAD_SOCKET_RETURN_VAL)
<< "Failed to create TCP ipv6 socket";
gpr_log(GPR_DEBUG, "Opened socket: %d", s);
char val = 1;
ASSERT_TRUE(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) !=
SOCKET_ERROR)
<< "Failed to set socketopt reuseaddr. WSA error: " +
std::to_string(WSAGetLastError());
ASSERT_TRUE(grpc_tcp_set_non_block(s) == GRPC_ERROR_NONE)
<< "Failed to set socket non-blocking";
ASSERT_TRUE(bind(s, (const sockaddr*)&addr, sizeof(addr)) != SOCKET_ERROR)
<< "Failed to bind socket " + std::to_string(s) +
" to [::1]:" + std::to_string(dummy_port) +
". WSA error: " + std::to_string(WSAGetLastError());
ASSERT_TRUE(listen(s, 1) != SOCKET_ERROR)
<< "Failed to listen on socket " + std::to_string(s) +
". WSA error: " + std::to_string(WSAGetLastError());
sockets.push_back(s);
}
// Do a non-blocking accept followed by a close on all of those sockets.
// Do this in a separate loop to try to induce a time window to hit races.
for (size_t i = 0; i < sockets.size(); i++) {
gpr_log(GPR_DEBUG, "non-blocking accept then close on %d", sockets[i]);
ASSERT_TRUE(accept(sockets[i], nullptr, nullptr) == INVALID_SOCKET)
<< "Accept on dummy socket unexpectedly accepted actual connection.";
ASSERT_TRUE(WSAGetLastError() == WSAEWOULDBLOCK)
<< "OpenAndCloseSocketsStressLoop accept on socket " +
std::to_string(sockets[i]) +
" failed in "
"an unexpected way. "
"WSA error: " +
std::to_string(WSAGetLastError()) +
". Socket use-after-close bugs are likely.";
ASSERT_TRUE(closesocket(sockets[i]) != SOCKET_ERROR)
<< "Failed to close socket: " + std::to_string(sockets[i]) +
". WSA error: " + std::to_string(WSAGetLastError());
}
}
return;
}
#else
void OpenAndCloseSocketsStressLoop(int dummy_port, gpr_event* done_ev) {
// The goal of this loop is to catch socket
// "use after close" bugs within the c-ares resolver by acting
// like some separate thread doing I/O.
// It's goal is to try to hit race conditions whereby:
// 1) The c-ares resolver closes a socket.
// 2) This loop opens a socket with (coincidentally) the same handle.
// 3) the c-ares resolver mistakenly uses that same socket without
// realizing that its closed.
// 4) This loop performs an operation on that socket that should
// succeed but instead fails because of what the c-ares
// resolver did in the meantime.
sockaddr_in6 addr;
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_port = htons(dummy_port);
((char*)&addr.sin6_addr)[15] = 1;
for (;;) {
if (gpr_event_get(done_ev)) {
return;
}
std::vector<int> sockets;
// First open a bunch of sockets, bind and listen
// '50' is an arbitrary number that, experimentally,
// has a good chance of catching bugs.
for (size_t i = 0; i < 50; i++) {
int s = socket(AF_INET6, SOCK_STREAM, 0);
int val = 1;
ASSERT_TRUE(setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)) ==
0)
<< "Failed to set socketopt reuseport";
ASSERT_TRUE(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) ==
0)
<< "Failed to set socket reuseaddr";
ASSERT_TRUE(fcntl(s, F_SETFL, O_NONBLOCK) == 0)
<< "Failed to set socket non-blocking";
ASSERT_TRUE(s != BAD_SOCKET_RETURN_VAL)
<< "Failed to create TCP ipv6 socket";
gpr_log(GPR_DEBUG, "Opened fd: %d", s);
ASSERT_TRUE(bind(s, (const sockaddr*)&addr, sizeof(addr)) == 0)
<< "Failed to bind socket " + std::to_string(s) +
" to [::1]:" + std::to_string(dummy_port) +
". errno: " + std::to_string(errno);
ASSERT_TRUE(listen(s, 1) == 0) << "Failed to listen on socket " +
std::to_string(s) +
". errno: " + std::to_string(errno);
sockets.push_back(s);
}
// Do a non-blocking accept followed by a close on all of those sockets.
// Do this in a separate loop to try to induce a time window to hit races.
for (size_t i = 0; i < sockets.size(); i++) {
gpr_log(GPR_DEBUG, "non-blocking accept then close on %d", sockets[i]);
if (accept(sockets[i], nullptr, nullptr)) {
// If e.g. a "shutdown" was called on this fd from another thread,
// then this accept call should fail with an unexpected error.
ASSERT_TRUE(errno == EAGAIN || errno == EWOULDBLOCK)
<< "OpenAndCloseSocketsStressLoop accept on socket " +
std::to_string(sockets[i]) +
" failed in "
"an unexpected way. "
"errno: " +
std::to_string(errno) +
". Socket use-after-close bugs are likely.";
}
ASSERT_TRUE(close(sockets[i]) == 0)
<< "Failed to close socket: " + std::to_string(sockets[i]) +
". errno: " + std::to_string(errno);
}
}
}
#endif
void CheckResolverResultLocked(void* argsp, grpc_error* err) {
EXPECT_EQ(err, GRPC_ERROR_NONE);
ArgsStruct* args = (ArgsStruct*)argsp;
grpc_channel_args* channel_args = args->channel_args;
const grpc_arg* channel_arg =
grpc_channel_args_find(channel_args, GRPC_ARG_LB_ADDRESSES);
GPR_ASSERT(channel_arg != nullptr);
GPR_ASSERT(channel_arg->type == GRPC_ARG_POINTER);
grpc_lb_addresses* addresses =
(grpc_lb_addresses*)channel_arg->value.pointer.p;
gpr_log(GPR_INFO, "num addrs found: %" PRIdPTR ". expected %" PRIdPTR,
addresses->num_addresses, args->expected_addrs.size());
GPR_ASSERT(addresses->num_addresses == args->expected_addrs.size());
std::vector<GrpcLBAddress> found_lb_addrs;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_lb_address addr = addresses->addresses[i];
char* str;
grpc_sockaddr_to_string(&str, &addr.address, 1 /* normalize */);
gpr_log(GPR_INFO, "%s", str);
found_lb_addrs.emplace_back(
GrpcLBAddress(std::string(str), addr.is_balancer));
gpr_free(str);
}
if (args->expected_addrs.size() != found_lb_addrs.size()) {
gpr_log(GPR_DEBUG,
"found lb addrs size is: %" PRIdPTR
". expected addrs size is %" PRIdPTR,
found_lb_addrs.size(), args->expected_addrs.size());
abort();
}
EXPECT_THAT(args->expected_addrs, UnorderedElementsAreArray(found_lb_addrs));
CheckServiceConfigResultLocked(channel_args, args);
if (args->expected_service_config_string == "") {
CheckLBPolicyResultLocked(channel_args, args);
}
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
void CheckResolvedWithoutErrorLocked(void* argsp, grpc_error* err) {
EXPECT_EQ(err, GRPC_ERROR_NONE);
ArgsStruct* args = (ArgsStruct*)argsp;
gpr_atm_rel_store(&args->done_atm, 1);
gpr_mu_lock(args->mu);
GRPC_LOG_IF_ERROR("pollset_kick", grpc_pollset_kick(args->pollset, nullptr));
gpr_mu_unlock(args->mu);
}
void RunResolvesRelevantRecordsTest(void (*OnDoneLocked)(void* arg,
grpc_error* error)) {
grpc_core::ExecCtx exec_ctx;
ArgsStruct args;
ArgsInit(&args);
args.expected_addrs = ParseExpectedAddrs(FLAGS_expected_addrs);
args.expected_service_config_string = FLAGS_expected_chosen_service_config;
args.expected_lb_policy = FLAGS_expected_lb_policy;
// maybe build the address with an authority
char* whole_uri = nullptr;
GPR_ASSERT(gpr_asprintf(&whole_uri, "dns://%s/%s",
FLAGS_local_dns_server_address.c_str(),
FLAGS_target_name.c_str()));
// create resolver and resolve
grpc_core::OrphanablePtr<grpc_core::Resolver> resolver =
grpc_core::ResolverRegistry::CreateResolver(whole_uri, nullptr,
args.pollset_set, args.lock);
gpr_free(whole_uri);
grpc_closure on_resolver_result_changed;
GRPC_CLOSURE_INIT(&on_resolver_result_changed, OnDoneLocked, (void*)&args,
grpc_combiner_scheduler(args.lock));
resolver->NextLocked(&args.channel_args, &on_resolver_result_changed);
grpc_core::ExecCtx::Get()->Flush();
PollPollsetUntilRequestDone(&args);
ArgsFinish(&args);
}
TEST(ResolverComponentTest, TestResolvesRelevantRecords) {
RunResolvesRelevantRecordsTest(CheckResolverResultLocked);
}
TEST(ResolverComponentTest, TestResolvesRelevantRecordsWithConcurrentFdStress) {
// Start up background stress thread
int dummy_port = grpc_pick_unused_port_or_die();
gpr_event done_ev;
gpr_event_init(&done_ev);
std::thread socket_stress_thread(OpenAndCloseSocketsStressLoop, dummy_port,
&done_ev);
// Run the resolver test
RunResolvesRelevantRecordsTest(CheckResolvedWithoutErrorLocked);
// Shutdown and join stress thread
gpr_event_set(&done_ev, (void*)1);
socket_stress_thread.join();
}
} // namespace
int main(int argc, char** argv) {
grpc_init();
grpc_test_init(argc, argv);
::testing::InitGoogleTest(&argc, argv);
ParseCommandLineFlags(&argc, &argv, true);
if (FLAGS_target_name == "") {
gpr_log(GPR_ERROR, "Missing target_name param.");
abort();
}
if (FLAGS_local_dns_server_address != "") {
gpr_log(GPR_INFO, "Specifying authority in uris to: %s",
FLAGS_local_dns_server_address.c_str());
}
auto result = RUN_ALL_TESTS();
grpc_shutdown();
return result;
}
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