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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*/
#ifndef TEST_TEST_HELPER_H_
#define TEST_TEST_HELPER_H_
#include <stdio.h>
#include <stdlib.h>
#include <optional>
#include "perfetto/base/build_config.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/scoped_file.h"
#include "perfetto/ext/base/subprocess.h"
#include "perfetto/ext/base/thread_task_runner.h"
#include "perfetto/ext/base/utils.h"
#include "perfetto/ext/tracing/core/consumer.h"
#include "perfetto/ext/tracing/core/shared_memory_arbiter.h"
#include "perfetto/ext/tracing/core/trace_packet.h"
#include "perfetto/ext/tracing/ipc/consumer_ipc_client.h"
#include "perfetto/ext/tracing/ipc/default_socket.h"
#include "perfetto/ext/tracing/ipc/service_ipc_host.h"
#include "perfetto/tracing/core/trace_config.h"
#include "src/base/test/test_task_runner.h"
#include "test/fake_producer.h"
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include "src/tracing/ipc/shared_memory_windows.h"
#else
#include <signal.h>
#include "src/traced/probes/probes_producer.h"
#include "src/tracing/ipc/posix_shared_memory.h"
#endif
#include "protos/perfetto/trace/trace_packet.gen.h"
namespace perfetto {
// This value has been bumped to 10s in Oct 2020 because the GCE-based emulator
// can be sensibly slower than real hw (more than 10x) and caused flakes.
// See bugs duped against b/171771440.
constexpr uint32_t kDefaultTestTimeoutMs = 30000;
inline const char* GetTestProducerSockName() {
// If we're building on Android and starting the daemons ourselves,
// create the sockets in a world-writable location.
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) && \
PERFETTO_BUILDFLAG(PERFETTO_START_DAEMONS)
return "/data/local/tmp/traced_producer";
#else
return ::perfetto::GetProducerSocket();
#endif
}
// Captures the values of some environment variables when constructed and
// restores them when destroyed.
class TestEnvCleaner {
public:
TestEnvCleaner() {}
TestEnvCleaner(std::initializer_list<const char*> env_vars) {
prev_state_.reserve(env_vars.size());
for (const char* name : env_vars) {
prev_state_.emplace_back();
Var& var = prev_state_.back();
var.name = name;
const char* prev_value = getenv(name);
if (prev_value) {
var.value.emplace(prev_value);
}
}
}
~TestEnvCleaner() { Clean(); }
TestEnvCleaner(const TestEnvCleaner&) = delete;
TestEnvCleaner(TestEnvCleaner&& obj) noexcept { *this = std::move(obj); }
TestEnvCleaner& operator=(const TestEnvCleaner&) = delete;
TestEnvCleaner& operator=(TestEnvCleaner&& obj) noexcept {
PERFETTO_CHECK(prev_state_.empty());
this->prev_state_ = std::move(obj.prev_state_);
obj.prev_state_.clear();
return *this;
}
void Clean() {
for (const Var& var : prev_state_) {
if (var.value) {
base::SetEnv(var.name, *var.value);
} else {
base::UnsetEnv(var.name);
}
}
prev_state_.clear();
}
private:
struct Var {
const char* name;
std::optional<std::string> value;
};
std::vector<Var> prev_state_;
};
// This is used only in daemon starting integrations tests.
class ServiceThread {
public:
ServiceThread(const std::string& producer_socket,
const std::string& consumer_socket)
: producer_socket_(producer_socket), consumer_socket_(consumer_socket) {}
~ServiceThread() { Stop(); }
TestEnvCleaner Start() {
TestEnvCleaner env_cleaner(
{"PERFETTO_PRODUCER_SOCK_NAME", "PERFETTO_CONSUMER_SOCK_NAME"});
runner_ = base::ThreadTaskRunner::CreateAndStart("perfetto.svc");
runner_->PostTaskAndWaitForTesting([this]() {
svc_ = ServiceIPCHost::CreateInstance(runner_->get());
if (remove(producer_socket_.c_str()) == -1) {
if (errno != ENOENT)
PERFETTO_FATAL("Failed to remove %s", producer_socket_.c_str());
}
if (remove(consumer_socket_.c_str()) == -1) {
if (errno != ENOENT)
PERFETTO_FATAL("Failed to remove %s", consumer_socket_.c_str());
}
base::SetEnv("PERFETTO_PRODUCER_SOCK_NAME", producer_socket_);
base::SetEnv("PERFETTO_CONSUMER_SOCK_NAME", consumer_socket_);
bool res =
svc_->Start(producer_socket_.c_str(), consumer_socket_.c_str());
if (!res) {
PERFETTO_FATAL("Failed to start service listening on %s and %s",
producer_socket_.c_str(), consumer_socket_.c_str());
}
});
return env_cleaner;
}
void Stop() {
if (!runner_)
return;
runner_->PostTaskAndWaitForTesting([this]() { svc_.reset(); });
runner_.reset();
}
base::ThreadTaskRunner* runner() { return runner_ ? &*runner_ : nullptr; }
private:
std::optional<base::ThreadTaskRunner> runner_; // Keep first.
std::string producer_socket_;
std::string consumer_socket_;
std::unique_ptr<ServiceIPCHost> svc_;
};
// This is used only in daemon starting integrations tests.
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
// On Windows we don't have any traced_probes, make this a no-op to avoid
// propagating #ifdefs to the outer test.
class ProbesProducerThread {
public:
ProbesProducerThread(const std::string& /*producer_socket*/) {}
void Connect() {}
};
#else
class ProbesProducerThread {
public:
ProbesProducerThread(const std::string& producer_socket)
: producer_socket_(producer_socket) {}
~ProbesProducerThread() {
if (!runner_)
return;
runner_->PostTaskAndWaitForTesting([this]() { producer_.reset(); });
}
void Connect() {
runner_ = base::ThreadTaskRunner::CreateAndStart("perfetto.prd.probes");
runner_->PostTaskAndWaitForTesting([this]() {
producer_.reset(new ProbesProducer());
producer_->ConnectWithRetries(producer_socket_.c_str(), runner_->get());
});
}
private:
std::optional<base::ThreadTaskRunner> runner_; // Keep first.
std::string producer_socket_;
std::unique_ptr<ProbesProducer> producer_;
};
#endif // !OS_WIN
class FakeProducerThread {
public:
FakeProducerThread(const std::string& producer_socket,
std::function<void()> connect_callback,
std::function<void()> setup_callback,
std::function<void()> start_callback)
: producer_socket_(producer_socket),
connect_callback_(std::move(connect_callback)),
setup_callback_(std::move(setup_callback)),
start_callback_(std::move(start_callback)) {
runner_ = base::ThreadTaskRunner::CreateAndStart("perfetto.prd.fake");
runner_->PostTaskAndWaitForTesting([this]() {
producer_.reset(
new FakeProducer("android.perfetto.FakeProducer", runner_->get()));
});
}
~FakeProducerThread() {
runner_->PostTaskAndWaitForTesting([this]() { producer_.reset(); });
}
void Connect() {
runner_->PostTaskAndWaitForTesting([this]() {
producer_->Connect(producer_socket_.c_str(), std::move(connect_callback_),
std::move(setup_callback_), std::move(start_callback_),
std::move(shm_), std::move(shm_arbiter_));
});
}
base::ThreadTaskRunner* runner() { return runner_ ? &*runner_ : nullptr; }
FakeProducer* producer() { return producer_.get(); }
void CreateProducerProvidedSmb() {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
SharedMemoryWindows::Factory factory;
#else
PosixSharedMemory::Factory factory;
#endif
shm_ = factory.CreateSharedMemory(1024 * 1024);
shm_arbiter_ = SharedMemoryArbiter::CreateUnboundInstance(shm_.get(), 4096);
}
void ProduceStartupEventBatch(const protos::gen::TestConfig& config,
std::function<void()> callback) {
PERFETTO_CHECK(shm_arbiter_);
producer_->ProduceStartupEventBatch(config, shm_arbiter_.get(), callback);
}
private:
std::optional<base::ThreadTaskRunner> runner_; // Keep first.
std::string producer_socket_;
std::unique_ptr<FakeProducer> producer_;
std::function<void()> connect_callback_;
std::function<void()> setup_callback_;
std::function<void()> start_callback_;
std::unique_ptr<SharedMemory> shm_;
std::unique_ptr<SharedMemoryArbiter> shm_arbiter_;
};
class TestHelper : public Consumer {
public:
enum class Mode {
kStartDaemons,
kUseSystemService,
};
static Mode kDefaultMode;
static const char* GetDefaultModeConsumerSocketName();
static const char* GetDefaultModeProducerSocketName();
explicit TestHelper(base::TestTaskRunner* task_runner)
: TestHelper(task_runner, kDefaultMode) {}
explicit TestHelper(base::TestTaskRunner* task_runner, Mode mode);
// Consumer implementation.
void OnConnect() override;
void OnDisconnect() override;
void OnTracingDisabled(const std::string& error) override;
virtual void ReadTraceData(std::vector<TracePacket> packets);
void OnTraceData(std::vector<TracePacket> packets, bool has_more) override;
void OnDetach(bool) override;
void OnAttach(bool, const TraceConfig&) override;
void OnTraceStats(bool, const TraceStats&) override;
void OnObservableEvents(const ObservableEvents&) override;
void OnSessionCloned(bool, const std::string&) override;
// Starts the tracing service if in kStartDaemons mode.
void StartServiceIfRequired();
// Restarts the tracing service. Only valid in kStartDaemons mode.
void RestartService();
// Connects the producer and waits that the service has seen the
// RegisterDataSource() call.
FakeProducer* ConnectFakeProducer();
void ConnectConsumer();
void StartTracing(const TraceConfig& config,
base::ScopedFile = base::ScopedFile());
void DisableTracing();
void FlushAndWait(uint32_t timeout_ms);
void ReadData(uint32_t read_count = 0);
void FreeBuffers();
void DetachConsumer(const std::string& key);
bool AttachConsumer(const std::string& key);
void CreateProducerProvidedSmb();
bool IsShmemProvidedByProducer();
void ProduceStartupEventBatch(const protos::gen::TestConfig& config);
void WaitFor(std::function<bool()> predicate,
const std::string& error_msg,
uint32_t timeout_ms = kDefaultTestTimeoutMs);
void WaitForConsumerConnect();
void WaitForProducerSetup();
void WaitForProducerEnabled();
void WaitForDataSourceConnected(const std::string& ds_name);
void WaitForTracingDisabled(uint32_t timeout_ms = kDefaultTestTimeoutMs);
void WaitForReadData(uint32_t read_count = 0,
uint32_t timeout_ms = kDefaultTestTimeoutMs);
void SyncAndWaitProducer();
TracingServiceState QueryServiceStateAndWait();
std::string AddID(const std::string& checkpoint) {
return checkpoint + "." + std::to_string(instance_num_);
}
std::function<void()> CreateCheckpoint(const std::string& checkpoint) {
return task_runner_->CreateCheckpoint(AddID(checkpoint));
}
void RunUntilCheckpoint(const std::string& checkpoint,
uint32_t timeout_ms = kDefaultTestTimeoutMs) {
return task_runner_->RunUntilCheckpoint(AddID(checkpoint), timeout_ms);
}
std::function<void()> WrapTask(const std::function<void()>& function);
base::ThreadTaskRunner* service_thread() { return service_thread_.runner(); }
base::ThreadTaskRunner* producer_thread() {
return fake_producer_thread_.runner();
}
const std::vector<protos::gen::TracePacket>& full_trace() {
return full_trace_;
}
const std::vector<protos::gen::TracePacket>& trace() { return trace_; }
// Some fixtures want to reuse a global TestHelper in different testcases
// without destroying and recreating it, but they still need to avoid
// polluting environment variables.
//
// This restores the previous environment variables.
void CleanEnv() { env_cleaner_.Clean(); }
private:
static uint64_t next_instance_num_;
uint64_t instance_num_;
base::TestTaskRunner* task_runner_ = nullptr;
int cur_consumer_num_ = 0;
uint64_t trace_count_ = 0;
std::function<void()> on_connect_callback_;
std::function<void()> on_packets_finished_callback_;
std::function<void()> on_stop_tracing_callback_;
std::function<void()> on_detach_callback_;
std::function<void(bool)> on_attach_callback_;
std::vector<protos::gen::TracePacket> full_trace_;
std::vector<protos::gen::TracePacket> trace_;
Mode mode_;
const char* producer_socket_;
const char* consumer_socket_;
ServiceThread service_thread_;
FakeProducerThread fake_producer_thread_;
TestEnvCleaner env_cleaner_;
std::unique_ptr<TracingService::ConsumerEndpoint> endpoint_; // Keep last.
};
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
// This class is a reference to a child process that has in essence been execv
// to the requested binary. The process will start and then wait for Run()
// before proceeding. We use this to fork new processes before starting any
// additional threads in the parent process (otherwise you would risk
// deadlocks), but pause the forked processes until remaining setup (including
// any necessary threads) in the parent process is complete.
class Exec {
public:
// Starts the forked process that was created. If not null then |stderr_out|
// will contain the stderr of the process.
int Run(std::string* stderr_out = nullptr) {
// We can't be the child process.
PERFETTO_CHECK(getpid() != subprocess_.pid());
// Will cause the entrypoint to continue.
PERFETTO_CHECK(write(*sync_pipe_.wr, "1", 1) == 1);
sync_pipe_.wr.reset();
subprocess_.Wait();
if (stderr_out) {
*stderr_out = std::move(subprocess_.output());
} else {
PERFETTO_LOG("Child proc %d exited with stderr: \"%s\"",
subprocess_.pid(), subprocess_.output().c_str());
}
return subprocess_.returncode();
}
Exec(const std::string& argv0,
std::initializer_list<std::string> args,
std::string input = "") {
subprocess_.args.stderr_mode = base::Subprocess::OutputMode::kBuffer;
subprocess_.args.stdout_mode = base::Subprocess::OutputMode::kDevNull;
subprocess_.args.input = input;
#if PERFETTO_BUILDFLAG(PERFETTO_START_DAEMONS)
constexpr bool kUseSystemBinaries = false;
#else
constexpr bool kUseSystemBinaries = true;
#endif
auto pass_env = [](const std::string& var, base::Subprocess* proc) {
const char* val = getenv(var.c_str());
if (val)
proc->args.env.push_back(var + "=" + val);
};
std::vector<std::string>& cmd = subprocess_.args.exec_cmd;
if (kUseSystemBinaries) {
PERFETTO_CHECK(TestHelper::kDefaultMode ==
TestHelper::Mode::kUseSystemService);
cmd.push_back("/system/bin/" + argv0);
cmd.insert(cmd.end(), args.begin(), args.end());
} else {
PERFETTO_CHECK(TestHelper::kDefaultMode ==
TestHelper::Mode::kStartDaemons);
subprocess_.args.env.push_back(
std::string("PERFETTO_PRODUCER_SOCK_NAME=") +
TestHelper::GetDefaultModeProducerSocketName());
subprocess_.args.env.push_back(
std::string("PERFETTO_CONSUMER_SOCK_NAME=") +
TestHelper::GetDefaultModeConsumerSocketName());
pass_env("TMPDIR", &subprocess_);
pass_env("TMP", &subprocess_);
pass_env("TEMP", &subprocess_);
cmd.push_back(base::GetCurExecutableDir() + "/" + argv0);
cmd.insert(cmd.end(), args.begin(), args.end());
}
if (!base::FileExists(cmd[0])) {
PERFETTO_FATAL(
"Cannot find %s. Make sure that the target has been built and, on "
"Android, pushed to the device.",
cmd[0].c_str());
}
// This pipe blocks the execution of the child process until the main test
// process calls Run(). There are two conflicting problems here:
// 1) We can't fork() subprocesses too late, because the test spawns threads
// for hosting the service. fork+threads = bad (see aosp/1089744).
// 2) We can't run the subprocess too early, because we need to wait that
// the service threads are ready before trying to connect from the child
// process.
sync_pipe_ = base::Pipe::Create();
int sync_pipe_rd = *sync_pipe_.rd;
subprocess_.args.preserve_fds.push_back(sync_pipe_rd);
// This lambda will be called on the forked child process after having
// setup pipe redirection and closed all FDs, right before the exec().
// The Subprocesss harness will take care of closing also |sync_pipe_.wr|.
subprocess_.args.posix_entrypoint_for_testing = [sync_pipe_rd] {
// Don't add any logging here, all file descriptors are closed and trying
// to log will likely cause undefined behaviors.
char ignored = 0;
PERFETTO_CHECK(PERFETTO_EINTR(read(sync_pipe_rd, &ignored, 1)) > 0);
PERFETTO_CHECK(close(sync_pipe_rd) == 0 || errno == EINTR);
};
subprocess_.Start();
sync_pipe_.rd.reset();
}
void SendSigterm() {
#ifdef SIGTERM
kill(subprocess_.pid(), SIGTERM);
#else
// This code is never used on Windows tests, not bothering.
if (subprocess_.pid()) // Always true, but avoids Wnoreturn compile errors.
PERFETTO_FATAL("SendSigterm() not implemented on this platform");
#endif
}
private:
base::Subprocess subprocess_;
base::Pipe sync_pipe_;
};
#endif // !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
} // namespace perfetto
#endif // TEST_TEST_HELPER_H_