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rlz/mac/lib/rlz_value_store_mac.mm

Index: rlz/mac/lib/rlz_value_store_mac.mm
diff --git a/rlz/mac/lib/rlz_value_store_mac.mm b/rlz/mac/lib/rlz_value_store_mac.mm
deleted file mode 100644
index 5313a3013a9b80a016434799a01b475891bb8877..0000000000000000000000000000000000000000
--- a/rlz/mac/lib/rlz_value_store_mac.mm
+++ /dev/null
@@ -1,447 +0,0 @@
-// 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.
-
-#include "rlz/mac/lib/rlz_value_store_mac.h"
-
-#include "base/mac/foundation_util.h"
-#include "base/file_path.h"
-#include "base/logging.h"
-#include "base/sys_string_conversions.h"
-#include "rlz/lib/assert.h"
-#include "rlz/lib/lib_values.h"
-#include "rlz/lib/rlz_lib.h"
-
-#import <Foundation/Foundation.h>
-#include <pthread.h>
-
-using base::mac::ObjCCast;
-
-namespace rlz_lib {
-
-// These are written to disk and should not be changed.
-NSString* const kPingTimeKey = @"pingTime";
-NSString* const kAccessPointKey = @"accessPoints";
-NSString* const kProductEventKey = @"productEvents";
-NSString* const kStatefulEventKey = @"statefulEvents";
-
-namespace {
-
-NSString* GetNSProductName(Product product) {
-  return base::SysUTF8ToNSString(GetProductName(product));
-}
-
-NSString* GetNSAccessPointName(AccessPoint p) {
-  return base::SysUTF8ToNSString(GetAccessPointName(p));
-}
-
-// Retrieves a subdictionary in |p| for key |k|, creating it if necessary.
-// If the dictionary contains an object for |k| that is not a mutable
-// dictionary, that object is replaced with an empty mutable dictinary.
-NSMutableDictionary* GetOrCreateDict(
-    NSMutableDictionary* p, NSString* k) {
-  NSMutableDictionary* d = ObjCCast<NSMutableDictionary>([p objectForKey:k]);
-  if (!d) {
-    d = [NSMutableDictionary dictionaryWithCapacity:0];
-    [p setObject:d forKey:k];
-  }
-  return d;
-}
-
-}  // namespace
-
-RlzValueStoreMac::RlzValueStoreMac(NSMutableDictionary* dict,
-                                   NSString* plist_path)
-  : dict_([dict retain]), plist_path_([plist_path retain]) {
-}
-
-RlzValueStoreMac::~RlzValueStoreMac() {
-}
-
-bool RlzValueStoreMac::HasAccess(AccessType type) {
-  NSFileManager* manager = [NSFileManager defaultManager];
-  switch (type) {
-    case kReadAccess:  return [manager isReadableFileAtPath:plist_path_];
-    case kWriteAccess: return [manager isWritableFileAtPath:plist_path_];
-  }
-}
-
-bool RlzValueStoreMac::WritePingTime(Product product, int64 time) {
-  NSNumber* n = [NSNumber numberWithLongLong:time];
-  [ProductDict(product) setObject:n forKey:kPingTimeKey];
-  return true;
-}
-
-bool RlzValueStoreMac::ReadPingTime(Product product, int64* time) {
-  if (NSNumber* n =
-      ObjCCast<NSNumber>([ProductDict(product) objectForKey:kPingTimeKey])) {
-    *time = [n longLongValue];
-    return true;
-  }
-  return false;
-}
-
-bool RlzValueStoreMac::ClearPingTime(Product product) {
-  [ProductDict(product) removeObjectForKey:kPingTimeKey];
-  return true;
-}
-
-
-bool RlzValueStoreMac::WriteAccessPointRlz(AccessPoint access_point,
-                                           const char* new_rlz) {
-  NSMutableDictionary* d = GetOrCreateDict(WorkingDict(), kAccessPointKey);
-  [d setObject:base::SysUTF8ToNSString(new_rlz)
-      forKey:GetNSAccessPointName(access_point)];
-  return true;
-}
-
-bool RlzValueStoreMac::ReadAccessPointRlz(AccessPoint access_point,
-                                          char* rlz,
-                                          size_t rlz_size) {
-  // Reading a non-existent access point counts as success.
-  if (NSDictionary* d = ObjCCast<NSDictionary>(
-        [WorkingDict() objectForKey:kAccessPointKey])) {
-    NSString* val = ObjCCast<NSString>(
-        [d objectForKey:GetNSAccessPointName(access_point)]);
-    if (!val) {
-      if (rlz_size > 0)
-        rlz[0] = '\0';
-      return true;
-    }
-
-    std::string s = base::SysNSStringToUTF8(val);
-    if (s.size() >= rlz_size) {
-      rlz[0] = 0;
-      ASSERT_STRING("GetAccessPointRlz: Insufficient buffer size");
-      return false;
-    }
-    strncpy(rlz, s.c_str(), rlz_size);
-    return true;
-  }
-  if (rlz_size > 0)
-    rlz[0] = '\0';
-  return true;
-}
-
-bool RlzValueStoreMac::ClearAccessPointRlz(AccessPoint access_point) {
-  if (NSMutableDictionary* d = ObjCCast<NSMutableDictionary>(
-      [WorkingDict() objectForKey:kAccessPointKey])) {
-    [d removeObjectForKey:GetNSAccessPointName(access_point)];
-  }
-  return true;
-}
-
-
-bool RlzValueStoreMac::AddProductEvent(Product product,
-                                       const char* event_rlz) {
-  [GetOrCreateDict(ProductDict(product), kProductEventKey)
-      setObject:[NSNumber numberWithBool:YES]
-      forKey:base::SysUTF8ToNSString(event_rlz)];
-  return true;
-}
-
-bool RlzValueStoreMac::ReadProductEvents(Product product,
-                                         std::vector<std::string>* events) {
-  if (NSDictionary* d = ObjCCast<NSDictionary>(
-      [ProductDict(product) objectForKey:kProductEventKey])) {
-    for (NSString* s in d)
-      events->push_back(base::SysNSStringToUTF8(s));
-    return true;
-  }
-  return true;
-}
-
-bool RlzValueStoreMac::ClearProductEvent(Product product,
-                                         const char* event_rlz) {
-  if (NSMutableDictionary* d = ObjCCast<NSMutableDictionary>(
-      [ProductDict(product) objectForKey:kProductEventKey])) {
-    [d removeObjectForKey:base::SysUTF8ToNSString(event_rlz)];
-    return true;
-  }
-  return false;
-}
-
-bool RlzValueStoreMac::ClearAllProductEvents(Product product) {
-  [ProductDict(product) removeObjectForKey:kProductEventKey];
-  return true;
-}
-
-
-bool RlzValueStoreMac::AddStatefulEvent(Product product,
-                                        const char* event_rlz) {
-  [GetOrCreateDict(ProductDict(product), kStatefulEventKey)
-      setObject:[NSNumber numberWithBool:YES]
-      forKey:base::SysUTF8ToNSString(event_rlz)];
-  return true;
-}
-
-bool RlzValueStoreMac::IsStatefulEvent(Product product,
-                                       const char* event_rlz) {
-  if (NSDictionary* d = ObjCCast<NSDictionary>(
-        [ProductDict(product) objectForKey:kStatefulEventKey])) {
-    return [d objectForKey:base::SysUTF8ToNSString(event_rlz)] != nil;
-  }
-  return false;
-}
-
-bool RlzValueStoreMac::ClearAllStatefulEvents(Product product) {
-  [ProductDict(product) removeObjectForKey:kStatefulEventKey];
-  return true;
-}
-
-
-void RlzValueStoreMac::CollectGarbage() {
-  NOTIMPLEMENTED();
-}
-
-NSDictionary* RlzValueStoreMac::dictionary() {
-  return dict_.get();
-}
-
-NSMutableDictionary* RlzValueStoreMac::WorkingDict() {
-  std::string brand(SupplementaryBranding::GetBrand());
-  if (brand.empty())
-    return dict_;
-
-  NSString* brand_ns =
-      [@"brand_" stringByAppendingString:base::SysUTF8ToNSString(brand)];
-
-  return GetOrCreateDict(dict_.get(), brand_ns);
-}
-
-NSMutableDictionary* RlzValueStoreMac::ProductDict(Product p) {
-  return GetOrCreateDict(WorkingDict(), GetNSProductName(p));
-}
-
-
-namespace {
-
-// Creating a recursive cross-process mutex on windows is one line. On mac,
-// there's no primitve for that, so this lock is emulated by an in-process
-// mutex to get the recursive part, followed by a cross-process lock for the
-// cross-process part.
-
-// This is a struct so that it doesn't need a static initializer.
-struct RecursiveCrossProcessLock {
-  // Tries to acquire a recursive cross-process lock. Note that this _always_
-  // acquires the in-process lock (if it wasn't already acquired). The parent
-  // directory of |lock_file| must exist.
-  bool TryGetCrossProcessLock(NSString* lock_filename);
-
-  // Releases the lock. Should always be called, even if
-  // TryGetCrossProcessLock() returns false.
-  void ReleaseLock();
-
-  pthread_mutex_t recursive_lock_;
-  pthread_t locking_thread_;
-
-  NSDistributedLock* file_lock_;
-} g_recursive_lock = {
-  // PTHREAD_RECURSIVE_MUTEX_INITIALIZER doesn't exist before 10.7 and is buggy
-  // on 10.7 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906#c34), so emulate
-  // recursive locking with a normal non-recursive mutex.
-  PTHREAD_MUTEX_INITIALIZER
-};
-
-bool RecursiveCrossProcessLock::TryGetCrossProcessLock(
-    NSString* lock_filename) {
-  bool just_got_lock = false;
-
-  // Emulate a recursive mutex with a non-recursive one.
-  if (pthread_mutex_trylock(&recursive_lock_) == EBUSY) {
-    if (pthread_equal(pthread_self(), locking_thread_) == 0) {
-      // Some other thread has the lock, wait for it.
-      pthread_mutex_lock(&recursive_lock_);
-      CHECK(locking_thread_ == 0);
-      just_got_lock = true;
-    }
-  } else {
-    just_got_lock = true;
-  }
-
-  locking_thread_ = pthread_self();
-
-  // Try to acquire file lock.
-  if (just_got_lock) {
-    const int kMaxTimeoutMS = 5000;  // Matches windows.
-    const int kSleepPerTryMS = 200;
-
-    CHECK(!file_lock_);
-    file_lock_ = [[NSDistributedLock alloc] initWithPath:lock_filename];
-
-    BOOL got_file_lock = NO;
-    int elapsedMS = 0;
-    while (!(got_file_lock = [file_lock_ tryLock]) &&
-           elapsedMS < kMaxTimeoutMS) {
-      usleep(kSleepPerTryMS * 1000);
-      elapsedMS += kSleepPerTryMS;
-    }
-
-    if (!got_file_lock) {
-      [file_lock_ release];
-      file_lock_ = nil;
-      return false;
-    }
-    return true;
-  } else {
-    return file_lock_ != nil;
-  }
-}
-
-void RecursiveCrossProcessLock::ReleaseLock() {
-  if (file_lock_) {
-    [file_lock_ unlock];
-    [file_lock_ release];
-    file_lock_ = nil;
-  }
-
-  locking_thread_ = 0;
-  pthread_mutex_unlock(&recursive_lock_);
-}
-
-
-// This is set during test execution, to write RLZ files into a temporary
-// directory instead of the user's Application Support folder.
-NSString* g_test_folder;
-
-// RlzValueStoreMac keeps its data in memory and only writes it to disk when
-// ScopedRlzValueStoreLock goes out of scope. Hence, if several
-// ScopedRlzValueStoreLocks are nested, they all need to use the same store
-// object.
-
-// This counts the nesting depth.
-int g_lock_depth = 0;
-
-// This is the store object that might be shared. Only set if g_lock_depth > 0.
-RlzValueStoreMac* g_store_object = NULL;
-
-
-NSString* CreateRlzDirectory() {
-  NSFileManager* manager = [NSFileManager defaultManager];
-  NSArray* paths = NSSearchPathForDirectoriesInDomains(
-      NSApplicationSupportDirectory, NSUserDomainMask, /*expandTilde=*/YES);
-  NSString* folder = nil;
-  if ([paths count] > 0)
-    folder = ObjCCast<NSString>([paths objectAtIndex:0]);
-  if (!folder)
-    folder = [@"~/Library/Application Support" stringByStandardizingPath];
-  folder = [folder stringByAppendingPathComponent:@"Google/RLZ"];
-
-  if (g_test_folder)
-    folder = [g_test_folder stringByAppendingPathComponent:folder];
-
-  [manager createDirectoryAtPath:folder
-     withIntermediateDirectories:YES
-                      attributes:nil
-                           error:nil];
-  return folder;
-}
-
-// Returns the path of the rlz plist store, also creates the parent directory
-// path if it doesn't exist.
-NSString* RlzPlistFilename() {
-  NSString* const kRlzFile = @"RlzStore.plist";
-  return [CreateRlzDirectory() stringByAppendingPathComponent:kRlzFile];
-}
-
-// Returns the path of the rlz lock file, also creates the parent directory
-// path if it doesn't exist.
-NSString* RlzLockFilename() {
-  NSString* const kRlzFile = @"lockfile";
-  return [CreateRlzDirectory() stringByAppendingPathComponent:kRlzFile];
-}
-
-}  // namespace
-
-ScopedRlzValueStoreLock::ScopedRlzValueStoreLock() {
-  bool got_distributed_lock =
-      g_recursive_lock.TryGetCrossProcessLock(RlzLockFilename());
-  // At this point, we hold the in-process lock, no matter the value of
-  // |got_distributed_lock|.
-
-  ++g_lock_depth;
-
-  if (!got_distributed_lock) {
-    // Give up. |store_| isn't set, which signals to callers that acquiring
-    // the lock failed. |g_recursive_lock| will be released by the
-    // destructor.
-    CHECK(!g_store_object);
-    return;
-  }
-
-  if (g_lock_depth > 1) {
-    // Reuse the already existing store object.
-    CHECK(g_store_object);
-    store_.reset(g_store_object);
-    return;
-  }
-
-  CHECK(!g_store_object);
-
-  NSString* plist = RlzPlistFilename();
-
-  // Create an empty file if none exists yet.
-  NSFileManager* manager = [NSFileManager defaultManager];
-  if (![manager fileExistsAtPath:plist isDirectory:NULL])
-    [[NSDictionary dictionary] writeToFile:plist atomically:YES];
-
-  NSMutableDictionary* dict =
-      [NSMutableDictionary dictionaryWithContentsOfFile:plist];
-  VERIFY(dict);
-
-  if (dict) {
-    store_.reset(new RlzValueStoreMac(dict, plist));
-    g_store_object = (RlzValueStoreMac*)store_.get();
-  }
-}
-
-ScopedRlzValueStoreLock::~ScopedRlzValueStoreLock() {
-  --g_lock_depth;
-  CHECK(g_lock_depth >= 0);
-
-  if (g_lock_depth > 0) {
-    // Other locks are still using store_, don't free it yet.
-    ignore_result(store_.release());
-    return;
-  }
-
-  if (store_.get()) {
-    g_store_object = NULL;
-
-    NSDictionary* dict =
-        static_cast<RlzValueStoreMac*>(store_.get())->dictionary();
-    VERIFY([dict writeToFile:RlzPlistFilename() atomically:YES]);
-  }
-
-  // Check that "store_ set" => "file_lock acquired". The converse isn't true,
-  // for example if the rlz data file can't be read.
-  if (store_.get())
-    CHECK(g_recursive_lock.file_lock_);
-  if (!g_recursive_lock.file_lock_)
-    CHECK(!store_.get());
-
-  g_recursive_lock.ReleaseLock();
-}
-
-RlzValueStore* ScopedRlzValueStoreLock::GetStore() {
-  return store_.get();
-}
-
-namespace testing {
-
-void SetRlzStoreDirectory(const FilePath& directory) {
-  base::mac::ScopedNSAutoreleasePool pool;
-
-  [g_test_folder release];
-  if (directory.empty()) {
-    g_test_folder = nil;
-  } else {
-    // Not Unsafe on OS X.
-    g_test_folder =
-      [[NSString alloc] initWithUTF8String:directory.AsUTF8Unsafe().c_str()];
-  }
-}
-
-}  // namespace testing
-
-}  // namespace rlz_lib