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//
//
// Copyright 2019 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 <arpa/inet.h>
#include <fcntl.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/wait.h>
#include <unistd.h>
#include <chrono>
#include <cstdlib>
#include <memory>
#include <string>
#include <thread>
#include "absl/flags/flag.h"
#include "absl/log/check.h"
#include "absl/log/log.h"
#include "absl/strings/str_format.h"
#include "absl/time/time.h"
#include <grpc/support/alloc.h>
#include <grpc/support/port_platform.h>
#include <grpcpp/channel.h>
#include <grpcpp/client_context.h>
#include <grpcpp/grpcpp.h>
#include <grpcpp/support/channel_arguments.h>
#include "src/core/lib/gprpp/crash.h"
#include "src/core/lib/iomgr/port.h"
#include "src/core/lib/iomgr/socket_mutator.h"
#include "src/core/util/string.h"
#include "src/proto/grpc/testing/empty.pb.h"
#include "src/proto/grpc/testing/messages.pb.h"
#include "src/proto/grpc/testing/test.grpc.pb.h"
#include "src/proto/grpc/testing/test.pb.h"
#include "test/cpp/util/test_config.h"
#include "test/cpp/util/test_credentials_provider.h"
ABSL_FLAG(std::string, custom_credentials_type, "",
"User provided credentials type.");
ABSL_FLAG(std::string, server_uri, "localhost:1000", "Server URI target");
ABSL_FLAG(std::string, induce_fallback_cmd, "exit 1",
"Shell command to induce fallback, e.g. by unrouting addresses");
ABSL_FLAG(int, fallback_deadline_seconds, 1,
"Number of seconds to wait for fallback to occur after inducing it");
ABSL_FLAG(std::string, test_case, "",
"Test case to run. Valid options are:\n\n"
"fallback_before_startup : fallback before making RPCs to backends"
"fallback_after_startup : fallback after making RPCs to backends");
#ifdef LINUX_VERSION_CODE
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37)
#define SOCKET_SUPPORTS_TCP_USER_TIMEOUT
#endif
#endif
#ifdef SOCKET_SUPPORTS_TCP_USER_TIMEOUT
using grpc::testing::GrpclbRouteType;
using grpc::testing::SimpleRequest;
using grpc::testing::SimpleResponse;
using grpc::testing::TestService;
namespace {
enum RpcMode {
FailFast,
WaitForReady,
};
GrpclbRouteType DoRPCAndGetPath(TestService::Stub* stub, int deadline_seconds,
RpcMode rpc_mode) {
LOG(INFO) << "DoRPCAndGetPath deadline_seconds:" << deadline_seconds
<< " rpc_mode:" << rpc_mode;
SimpleRequest request;
SimpleResponse response;
grpc::ClientContext context;
if (rpc_mode == WaitForReady) {
context.set_wait_for_ready(true);
}
request.set_fill_grpclb_route_type(true);
std::chrono::system_clock::time_point deadline =
std::chrono::system_clock::now() + std::chrono::seconds(deadline_seconds);
context.set_deadline(deadline);
grpc::Status s = stub->UnaryCall(&context, request, &response);
if (!s.ok()) {
LOG(INFO) << "DoRPCAndGetPath failed. status-message: "
<< s.error_message();
return GrpclbRouteType::GRPCLB_ROUTE_TYPE_UNKNOWN;
}
CHECK(response.grpclb_route_type() ==
GrpclbRouteType::GRPCLB_ROUTE_TYPE_BACKEND ||
response.grpclb_route_type() ==
GrpclbRouteType::GRPCLB_ROUTE_TYPE_FALLBACK);
LOG(INFO) << "DoRPCAndGetPath done. grpclb_route_type:"
<< response.grpclb_route_type();
return response.grpclb_route_type();
}
GrpclbRouteType DoRPCAndGetPath(TestService::Stub* stub, int deadline_seconds) {
return DoRPCAndGetPath(stub, deadline_seconds, FailFast);
}
bool TcpUserTimeoutMutateFd(int fd, grpc_socket_mutator* /*mutator*/) {
int timeout = 20000; // 20 seconds
LOG(INFO) << "Setting socket option TCP_USER_TIMEOUT on fd: " << fd;
if (0 != setsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &timeout,
sizeof(timeout))) {
grpc_core::Crash("Failed to set socket option TCP_USER_TIMEOUT");
}
int newval;
socklen_t len = sizeof(newval);
if (0 != getsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &newval, &len) ||
newval != timeout) {
grpc_core::Crash("Failed to get expected socket option TCP_USER_TIMEOUT");
}
return true;
}
int TcpUserTimeoutCompare(grpc_socket_mutator* /*a*/,
grpc_socket_mutator* /*b*/) {
return 0;
}
void TcpUserTimeoutDestroy(grpc_socket_mutator* mutator) { delete mutator; }
const grpc_socket_mutator_vtable kTcpUserTimeoutMutatorVtable =
grpc_socket_mutator_vtable{TcpUserTimeoutMutateFd, TcpUserTimeoutCompare,
TcpUserTimeoutDestroy, nullptr};
std::unique_ptr<TestService::Stub> CreateFallbackTestStub() {
grpc::ChannelArguments channel_args;
grpc_socket_mutator* tcp_user_timeout_mutator = new grpc_socket_mutator();
grpc_socket_mutator_init(tcp_user_timeout_mutator,
&kTcpUserTimeoutMutatorVtable);
channel_args.SetSocketMutator(tcp_user_timeout_mutator);
// Allow LB policy to be configured by service config
channel_args.SetInt(GRPC_ARG_SERVICE_CONFIG_DISABLE_RESOLUTION, 0);
std::shared_ptr<grpc::ChannelCredentials> channel_creds =
grpc::testing::GetCredentialsProvider()->GetChannelCredentials(
absl::GetFlag(FLAGS_custom_credentials_type), &channel_args);
return TestService::NewStub(grpc::CreateCustomChannel(
absl::GetFlag(FLAGS_server_uri), channel_creds, channel_args));
}
void RunCommand(const std::string& command) {
LOG(INFO) << "RunCommand: |" << command << "|";
int out = std::system(command.c_str());
if (WIFEXITED(out)) {
int code = WEXITSTATUS(out);
if (code != 0) {
grpc_core::Crash(
absl::StrFormat("RunCommand failed exit code:%d command:|%s|", code,
command.c_str()));
}
} else {
grpc_core::Crash(
absl::StrFormat("RunCommand failed command:|%s|", command.c_str()));
}
}
void WaitForFallbackAndDoRPCs(TestService::Stub* stub) {
int fallback_retry_count = 0;
bool fallback = false;
absl::Time fallback_deadline =
absl::Now() +
absl::Seconds(absl::GetFlag(FLAGS_fallback_deadline_seconds));
while (absl::Now() < fallback_deadline) {
GrpclbRouteType grpclb_route_type = DoRPCAndGetPath(stub, 1);
if (grpclb_route_type == GrpclbRouteType::GRPCLB_ROUTE_TYPE_BACKEND) {
LOG(ERROR) << "Got grpclb route type backend. Backends are "
"supposed to be unreachable, so this test is broken";
CHECK(0);
}
if (grpclb_route_type == GrpclbRouteType::GRPCLB_ROUTE_TYPE_FALLBACK) {
LOG(INFO) << "Made one successful RPC to a fallback. Now expect the same "
"for the rest.";
fallback = true;
break;
} else {
LOG(ERROR) << "Retryable RPC failure on iteration: "
<< fallback_retry_count;
}
fallback_retry_count++;
}
if (!fallback) {
LOG(ERROR) << "Didn't fall back within deadline";
CHECK(0);
}
for (int i = 0; i < 30; i++) {
GrpclbRouteType grpclb_route_type = DoRPCAndGetPath(stub, 20);
CHECK(grpclb_route_type == GrpclbRouteType::GRPCLB_ROUTE_TYPE_FALLBACK);
std::this_thread::sleep_for(std::chrono::seconds(1));
}
}
void DoFallbackBeforeStartupTest() {
std::unique_ptr<TestService::Stub> stub = CreateFallbackTestStub();
RunCommand(absl::GetFlag(FLAGS_induce_fallback_cmd));
WaitForFallbackAndDoRPCs(stub.get());
}
void DoFallbackAfterStartupTest() {
std::unique_ptr<TestService::Stub> stub = CreateFallbackTestStub();
GrpclbRouteType grpclb_route_type = DoRPCAndGetPath(stub.get(), 20);
CHECK(grpclb_route_type == GrpclbRouteType::GRPCLB_ROUTE_TYPE_BACKEND);
RunCommand(absl::GetFlag(FLAGS_induce_fallback_cmd));
WaitForFallbackAndDoRPCs(stub.get());
}
} // namespace
int main(int argc, char** argv) {
grpc::testing::InitTest(&argc, &argv, true);
LOG(INFO) << "Testing: " << absl::GetFlag(FLAGS_test_case);
if (absl::GetFlag(FLAGS_test_case) == "fallback_before_startup") {
DoFallbackBeforeStartupTest();
LOG(INFO) << "DoFallbackBeforeStartup done!";
} else if (absl::GetFlag(FLAGS_test_case) == "fallback_after_startup") {
DoFallbackAfterStartupTest();
LOG(INFO) << "DoFallbackBeforeStartup done!";
} else {
grpc_core::Crash(absl::StrFormat("Invalid test case: %s",
absl::GetFlag(FLAGS_test_case).c_str()));
}
}
#else
int main(int argc, char** argv) {
grpc::testing::InitTest(&argc, &argv, true);
grpc_core::Crash(
"This test requires TCP_USER_TIMEOUT, which isn't available");
}
#endif // SOCKET_SUPPORTS_TCP_USER_TIMEOUT