Reorganize net/disk_cache into backend specific directories.

net/disk_cache/stress_cache.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This is a simple application that stress-tests the crash recovery of the disk
-// cache. The main application starts a copy of itself on a loop, checking the
-// exit code of the child process. When the child dies in an unexpected way,
-// the main application quits.
-
-// The child application has two threads: one to exercise the cache in an
-// infinite loop, and another one to asynchronously kill the process.
-
-// A regular build should never crash.
-// To test that the disk cache doesn't generate critical errors with regular
-// application level crashes, edit stress_support.h.
-
-#include <string>
-#include <vector>
-
-#include "base/at_exit.h"
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/debug/debugger.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/message_loop/message_loop.h"
-#include "base/path_service.h"
-#include "base/process/kill.h"
-#include "base/process/launch.h"
-#include "base/process/process_handle.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/threading/platform_thread.h"
-#include "base/threading/thread.h"
-#include "net/base/io_buffer.h"
-#include "net/base/net_errors.h"
-#include "net/base/test_completion_callback.h"
-#include "net/disk_cache/backend_impl.h"
-#include "net/disk_cache/disk_cache.h"
-#include "net/disk_cache/disk_cache_test_util.h"
-#include "net/disk_cache/stress_support.h"
-#include "net/disk_cache/trace.h"
-
-#if defined(OS_WIN)
-#include "base/logging_win.h"
-#endif
-
-using base::Time;
-
-const int kError = -1;
-const int kExpectedCrash = 100;
-
-// Starts a new process.
-int RunSlave(int iteration) {
-  base::FilePath exe;
-  PathService::Get(base::FILE_EXE, &exe);
-
-  CommandLine cmdline(exe);
-  cmdline.AppendArg(base::IntToString(iteration));
-
-  base::ProcessHandle handle;
-  if (!base::LaunchProcess(cmdline, base::LaunchOptions(), &handle)) {
-    printf("Unable to run test\n");
-    return kError;
-  }
-
-  int exit_code;
-  if (!base::WaitForExitCode(handle, &exit_code)) {
-    printf("Unable to get return code\n");
-    return kError;
-  }
-  return exit_code;
-}
-
-// Main loop for the master process.
-int MasterCode() {
-  for (int i = 0; i < 100000; i++) {
-    int ret = RunSlave(i);
-    if (kExpectedCrash != ret)
-      return ret;
-  }
-
-  printf("More than enough...\n");
-
-  return 0;
-}
-
-// -----------------------------------------------------------------------
-
-std::string GenerateStressKey() {
-  char key[20 * 1024];
-  size_t size = 50 + rand() % 20000;
-  CacheTestFillBuffer(key, size, true);
-
-  key[size - 1] = '\0';
-  return std::string(key);
-}
-
-// This thread will loop forever, adding and removing entries from the cache.
-// iteration is the current crash cycle, so the entries on the cache are marked
-// to know which instance of the application wrote them.
-void StressTheCache(int iteration) {
-  int cache_size = 0x2000000;  // 32MB.
-  uint32 mask = 0xfff;  // 4096 entries.
-
-  base::FilePath path;
-  PathService::Get(base::DIR_TEMP, &path);
-  path = path.AppendASCII("cache_test_stress");
-
-  base::Thread cache_thread("CacheThread");
-  if (!cache_thread.StartWithOptions(
-          base::Thread::Options(base::MessageLoop::TYPE_IO, 0)))
-    return;
-
-  disk_cache::BackendImpl* cache =
-      new disk_cache::BackendImpl(path, mask,
-                                  cache_thread.message_loop_proxy().get(),
-                                  NULL);
-  cache->SetMaxSize(cache_size);
-  cache->SetFlags(disk_cache::kNoLoadProtection);
-
-  net::TestCompletionCallback cb;
-  int rv = cache->Init(cb.callback());
-
-  if (cb.GetResult(rv) != net::OK) {
-    printf("Unable to initialize cache.\n");
-    return;
-  }
-  printf("Iteration %d, initial entries: %d\n", iteration,
-         cache->GetEntryCount());
-
-  int seed = static_cast<int>(Time::Now().ToInternalValue());
-  srand(seed);
-
-  // kNumKeys is meant to be enough to have about 3x or 4x iterations before
-  // the process crashes.
-#ifdef NDEBUG
-  const int kNumKeys = 4000;
-#else
-  const int kNumKeys = 1200;
-#endif
-  const int kNumEntries = 30;
-  std::string keys[kNumKeys];
-  disk_cache::Entry* entries[kNumEntries] = {0};
-
-  for (int i = 0; i < kNumKeys; i++) {
-    keys[i] = GenerateStressKey();
-  }
-
-  const int kSize = 20000;
-  scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kSize));
-  memset(buffer->data(), 'k', kSize);
-
-  for (int i = 0;; i++) {
-    int slot = rand() % kNumEntries;
-    int key = rand() % kNumKeys;
-    bool truncate = (rand() % 2 == 0);
-    int size = kSize - (rand() % 20) * kSize / 20;
-
-    if (entries[slot])
-      entries[slot]->Close();
-
-    net::TestCompletionCallback cb;
-    rv = cache->OpenEntry(keys[key], &entries[slot], cb.callback());
-    if (cb.GetResult(rv) != net::OK) {
-      rv = cache->CreateEntry(keys[key], &entries[slot], cb.callback());
-      CHECK_EQ(net::OK, cb.GetResult(rv));
-    }
-
-    base::snprintf(buffer->data(), kSize,
-                   "i: %d iter: %d, size: %d, truncate: %d     ", i, iteration,
-                   size, truncate ? 1 : 0);
-    rv = entries[slot]->WriteData(0, 0, buffer.get(), size, cb.callback(),
-                                  truncate);
-    CHECK_EQ(size, cb.GetResult(rv));
-
-    if (rand() % 100 > 80) {
-      key = rand() % kNumKeys;
-      net::TestCompletionCallback cb2;
-      rv = cache->DoomEntry(keys[key], cb2.callback());
-      cb2.GetResult(rv);
-    }
-
-    if (!(i % 100))
-      printf("Entries: %d    \r", i);
-  }
-}
-
-// We want to prevent the timer thread from killing the process while we are
-// waiting for the debugger to attach.
-bool g_crashing = false;
-
-// RunSoon() and CrashCallback() reference each other, unfortunately.
-void RunSoon(base::MessageLoop* target_loop);
-
-void CrashCallback() {
-  // Keep trying to run.
-  RunSoon(base::MessageLoop::current());
-
-  if (g_crashing)
-    return;
-
-  if (rand() % 100 > 30) {
-    printf("sweet death...\n");
-#if defined(OS_WIN)
-    // Windows does more work on _exit() that we would like, so we use Kill.
-    base::KillProcessById(base::GetCurrentProcId(), kExpectedCrash, false);
-#elif defined(OS_POSIX)
-    // On POSIX, _exit() will terminate the process with minimal cleanup,
-    // and it is cleaner than killing.
-    _exit(kExpectedCrash);
-#endif
-  }
-}
-
-void RunSoon(base::MessageLoop* target_loop) {
-  const base::TimeDelta kTaskDelay = base::TimeDelta::FromSeconds(10);
-  target_loop->PostDelayedTask(
-      FROM_HERE, base::Bind(&CrashCallback), kTaskDelay);
-}
-
-// We leak everything here :)
-bool StartCrashThread() {
-  base::Thread* thread = new base::Thread("party_crasher");
-  if (!thread->Start())
-    return false;
-
-  RunSoon(thread->message_loop());
-  return true;
-}
-
-void CrashHandler(const std::string& str) {
-  g_crashing = true;
-  base::debug::BreakDebugger();
-}
-
-bool MessageHandler(int severity, const char* file, int line,
-                    size_t message_start, const std::string& str) {
-  const size_t kMaxMessageLen = 48;
-  char message[kMaxMessageLen];
-  size_t len = std::min(str.length() - message_start, kMaxMessageLen - 1);
-
-  memcpy(message, str.c_str() + message_start, len);
-  message[len] = '\0';
-#if !defined(DISK_CACHE_TRACE_TO_LOG)
-  disk_cache::Trace("%s", message);
-#endif
-  return false;
-}
-
-// -----------------------------------------------------------------------
-
-#if defined(OS_WIN)
-// {B9A153D4-31C3-48e4-9ABF-D54383F14A0D}
-const GUID kStressCacheTraceProviderName = {
-    0xb9a153d4, 0x31c3, 0x48e4,
-        { 0x9a, 0xbf, 0xd5, 0x43, 0x83, 0xf1, 0x4a, 0xd } };
-#endif
-
-int main(int argc, const char* argv[]) {
-  // Setup an AtExitManager so Singleton objects will be destructed.
-  base::AtExitManager at_exit_manager;
-
-  if (argc < 2)
-    return MasterCode();
-
-  logging::SetLogAssertHandler(CrashHandler);
-  logging::SetLogMessageHandler(MessageHandler);
-
-#if defined(OS_WIN)
-  logging::LogEventProvider::Initialize(kStressCacheTraceProviderName);
-#else
-  CommandLine::Init(argc, argv);
-  logging::LoggingSettings settings;
-  settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
-  logging::InitLogging(settings);
-#endif
-
-  // Some time for the memory manager to flush stuff.
-  base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(3));
-  base::MessageLoopForIO message_loop;
-
-  char* end;
-  long int iteration = strtol(argv[1], &end, 0);
-
-  if (!StartCrashThread()) {
-    printf("failed to start thread\n");
-    return kError;
-  }
-
-  StressTheCache(iteration);
-  return 0;
-}