Add basic support for CAPS exe

1- A singleton
2- A logger

Now CAPS depends on base and on chrome/common_version. About 190KB
on plain release build.

BUG=447073

Review URL: https://codereview.chromium.org/890213002

Cr-Commit-Position: refs/heads/master@{#314411}

7 files changed, 237 insertions, 2 deletions

diff --git a/chrome/tools/crash_service/caps/caps.gyp b/chrome/tools/crash_service/caps/caps.gyp
index f18f84d..bcbe414 100644
--- a/chrome/tools/crash_service/caps/caps.gyp
+++ b/chrome/tools/crash_service/caps/caps.gyp
@@ -39,14 +39,21 @@
       'target_name': 'caps',
       'type': 'executable',
       'include_dirs': [
-        '../..',
+        '..',
       ],
       'sources': [
+        'exit_codes.h',
+        'logger_win.cc',
+        'logger_win.h',
         'main_win.cc',
+        'process_singleton_win.cc',
+        'process_singleton_win.h',
         '<(SHARED_INTERMEDIATE_DIR)/caps/caps_version.rc',
       ],
       'dependencies': [
         'caps_resources',
+        '../../../../base/base.gyp:base',
+        '../../../../chrome/chrome.gyp:common_version',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
diff --git a/chrome/tools/crash_service/caps/exit_codes.h b/chrome/tools/crash_service/caps/exit_codes.h
new file mode 100644
index 0000000..583e0a5
--- /dev/null
+++ b/chrome/tools/crash_service/caps/exit_codes.h
@@ -0,0 +1,21 @@
+// Copyright 2015 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.
+
+#ifndef CHROME_TOOLS_CRASH_SERVICE_CAPS_EXIT_CODES_H_
+#define CHROME_TOOLS_CRASH_SERVICE_CAPS_EXIT_CODES_H_
+
+namespace caps {
+
+// Exit codes for CAPS. Don't reorder these values.
+enum ExitCodes {
+  EC_NORMAL_EXIT = 0,
+  EC_EXISTING_INSTANCE,
+  EC_INIT_ERROR,
+  EC_LAST_CODE
+};
+
+}  // namespace caps
+
+#endif  // CHROME_TOOLS_CRASH_SERVICE_CAPS_EXIT_CODES_H_
+
diff --git a/chrome/tools/crash_service/caps/logger_win.cc b/chrome/tools/crash_service/caps/logger_win.cc
new file mode 100644
index 0000000..2e4a1cf
--- /dev/null
+++ b/chrome/tools/crash_service/caps/logger_win.cc
@@ -0,0 +1,89 @@
+// Copyright 2015 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.
+
+#include <windows.h>
+#include <time.h>
+
+#include "base/files/file_path.h"
+#include "base/strings/stringprintf.h"
+#include "chrome/common/chrome_version_info_values.h"
+#include "chrome/tools/crash_service/caps/logger_win.h"
+
+namespace {
+// Every message has this structure:
+// <index>~ <tick_count> <message> ~\n"
+const char kMessageHeader[] = "%03d~ %08x %s ~\n";
+
+// Do not re-order these messages. Only add at the end.
+const char* kMessages[] {
+  "start pid(%lu) version(%s) time(%s)",                    // 0
+  "exit pid(%lu) time(%s)",                                 // 1
+  "instance found",                                         // 2
+};
+
+bool WriteLogLine(HANDLE file, const std::string& txt) {
+  if (txt.empty())
+    return true;
+  DWORD written;
+  auto rc = ::WriteFile(file, txt.c_str(),
+                        static_cast<DWORD>(txt.size()),
+                        &written,
+                        nullptr);
+  return (rc == TRUE);
+}
+
+// Uses |kMessages| at |index| above to write to disk a formatted log line.
+bool WriteFormattedLogLine(HANDLE file, size_t index, ...) {
+  va_list ap;
+  va_start(ap, index);
+  auto fmt = base::StringPrintf(
+      kMessageHeader, index, ::GetTickCount(), kMessages[index]);
+  auto msg = base::StringPrintV(fmt.c_str(), ap);
+  auto rc = WriteLogLine(file, msg.c_str());
+  va_end(ap);
+  return rc;
+}
+
+// Returns the current time and date formatted in standard C style.
+std::string DateTime() {
+  time_t current_time = 0;
+  time(&current_time);
+  struct tm local_time = {0};
+  char time_buf[26] = {0};
+  localtime_s(&local_time, &current_time);
+  asctime_s(time_buf, &local_time);
+  time_buf[24] = '\0';
+  return time_buf;
+}
+
+}  // namespace
+
+namespace caps {
+
+Logger::Logger(const base::FilePath& path) : file_(INVALID_HANDLE_VALUE) {
+  auto logfile = path.Append(L"caps_log.txt");
+  // Opening a file like so allows atomic appends, but can't be used
+  // for anything else.
+  DWORD kShareAll = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
+  file_ = ::CreateFile(logfile.value().c_str(),
+                       FILE_APPEND_DATA, kShareAll,
+                       nullptr,
+                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
+                       nullptr);
+  if (file_ == INVALID_HANDLE_VALUE)
+    return;
+  WriteFormattedLogLine(
+      file_, 0, ::GetCurrentProcessId(), PRODUCT_VERSION, DateTime().c_str());
+}
+
+Logger::~Logger() {
+  if (file_ != INVALID_HANDLE_VALUE) {
+    WriteFormattedLogLine(
+        file_, 1, ::GetCurrentProcessId(), DateTime().c_str());
+    ::CloseHandle(file_);
+  }
+}
+
+}  // namespace caps
+
diff --git a/chrome/tools/crash_service/caps/logger_win.h b/chrome/tools/crash_service/caps/logger_win.h
new file mode 100644
index 0000000..efa0b94
--- /dev/null
+++ b/chrome/tools/crash_service/caps/logger_win.h
@@ -0,0 +1,32 @@
+// Copyright 2015 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.
+
+#ifndef CHROME_TOOLS_CRASH_SERVICE_CAPS_LOGGER_WIN_H_
+#define CHROME_TOOLS_CRASH_SERVICE_CAPS_LOGGER_WIN_H_
+
+#include <windows.h>
+
+#include "base/macros.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace caps {
+// Creates a human-readable activity log file.
+class Logger {
+public:
+  explicit Logger(const base::FilePath& path);
+  ~Logger();
+
+private:
+  HANDLE file_;
+
+  DISALLOW_COPY_AND_ASSIGN(Logger);
+};
+
+}  // namespace caps
+
+#endif  // CHROME_TOOLS_CRASH_SERVICE_CAPS_LOGGER_WIN_H_
+
diff --git a/chrome/tools/crash_service/caps/main_win.cc b/chrome/tools/crash_service/caps/main_win.cc
index b2c0174..6146165 100644
--- a/chrome/tools/crash_service/caps/main_win.cc
+++ b/chrome/tools/crash_service/caps/main_win.cc
@@ -4,6 +4,33 @@
 
 #include <windows.h>
 
+#include "base/at_exit.h"
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/version.h"
+#include "chrome/tools/crash_service/caps/exit_codes.h"
+#include "chrome/tools/crash_service/caps/logger_win.h"
+#include "chrome/tools/crash_service/caps/process_singleton_win.h"
+
 int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE prev, wchar_t*, int) {
-  return 0;
+  base::AtExitManager at_exit_manager;
+  base::FilePath dir_exe;
+  if (!PathService::Get(base::DIR_EXE, &dir_exe))
+    return caps::EC_INIT_ERROR;
+
+  // What directory we write depends if we are being run from the actual
+  // location (a versioned directory) or from a build output directory.
+  base::Version version(dir_exe.BaseName().MaybeAsASCII());
+  auto data_path = version.IsValid() ? dir_exe.DirName() : dir_exe;
+
+  // Start logging.
+  caps::Logger logger(data_path);
+
+  // Check for an existing running instance.
+  caps::ProcessSingleton process_singleton;
+  if (process_singleton.other_instance())
+    return caps::EC_EXISTING_INSTANCE;
+
+  return caps::EC_NORMAL_EXIT;
 }
+
diff --git a/chrome/tools/crash_service/caps/process_singleton_win.cc b/chrome/tools/crash_service/caps/process_singleton_win.cc
new file mode 100644
index 0000000..f51accc
--- /dev/null
+++ b/chrome/tools/crash_service/caps/process_singleton_win.cc
@@ -0,0 +1,29 @@
+// Copyright 2015 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.
+
+#include <windows.h>
+
+#include "chrome/tools/crash_service/caps/process_singleton_win.h"
+
+namespace caps {
+
+ProcessSingleton::ProcessSingleton() : mutex_(nullptr) {
+  auto mutex = ::CreateMutex(nullptr, TRUE, L"CHROME.CAPS.V1");
+  if (!mutex)
+    return;
+  if (::GetLastError() == ERROR_ALREADY_EXISTS) {
+    ::CloseHandle(mutex);
+    return;
+  }
+  // We are now the single instance.
+  mutex_ = mutex;
+}
+
+ProcessSingleton::~ProcessSingleton() {
+  if (mutex_)
+    ::CloseHandle(mutex_);
+}
+
+}  // namespace caps
+
diff --git a/chrome/tools/crash_service/caps/process_singleton_win.h b/chrome/tools/crash_service/caps/process_singleton_win.h
new file mode 100644
index 0000000..5440d9c
--- /dev/null
+++ b/chrome/tools/crash_service/caps/process_singleton_win.h
@@ -0,0 +1,30 @@
+// Copyright 2015 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.
+
+#ifndef CHROME_TOOLS_CRASH_SERVICE_CAPS_PROCESS_SINGLETON_WIN_H_
+#define CHROME_TOOLS_CRASH_SERVICE_CAPS_PROCESS_SINGLETON_WIN_H_
+
+#include <windows.h>
+
+#include "base/macros.h"
+
+namespace caps {
+// Uses a named mutex to make sure that only one process of
+// with this particular version is launched.
+class ProcessSingleton {
+public:
+  ProcessSingleton();
+  ~ProcessSingleton();
+  bool other_instance() const { return mutex_ == NULL; }
+
+private:
+  HANDLE mutex_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
+};
+
+}  // namespace caps
+
+#endif  // CHROME_TOOLS_CRASH_SERVICE_CAPS_PROCESS_SINGLETON_WIN_H_
+