UMA metrics for cloud policies.

chrome/browser/policy/user_policy_disk_cache.cc

 // Copyright (c) 2011 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 "base/file_util.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "base/task.h"
+#include "chrome/browser/policy/enterprise_metrics.h"
 #include "chrome/browser/policy/proto/device_management_local.pb.h"
 #include "chrome/browser/policy/user_policy_disk_cache.h"
 #include "content/browser/browser_thread.h"
 
+namespace {
+
+// Other places can sample on the same UMA counter, so make sure they all do
+// it on the same thread (UI).
+void SampleUMAOnUIThread(policy::MetricPolicy sample) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  UMA_HISTOGRAM_ENUMERATION(policy::kMetricPolicy, sample,
+                            policy::kMetricPolicySize);
+}
+
+void SampleUMA(policy::MetricPolicy sample) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+                          NewRunnableFunction(&SampleUMAOnUIThread, sample));
+}
+
+}  // namespace
+
 namespace policy {
 
 UserPolicyDiskCache::Delegate::~Delegate() {}
 
 UserPolicyDiskCache::UserPolicyDiskCache(
     const base::WeakPtr<Delegate>& delegate,
     const FilePath& backing_file_path)
     : delegate_(delegate),
       backing_file_path_(backing_file_path) {}
 
 void UserPolicyDiskCache::Load() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  UMA_HISTOGRAM_ENUMERATION(kMetricPolicy, kMetricPolicyLoadRequested,
+                            kMetricPolicySize);
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &UserPolicyDiskCache::LoadOnFileThread));
 }
 
 void UserPolicyDiskCache::Store(
     const em::CachedCloudPolicyResponse& policy) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  UMA_HISTOGRAM_ENUMERATION(kMetricPolicy, kMetricPolicyStoreRequested,
+                            kMetricPolicySize);
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &UserPolicyDiskCache::StoreOnFileThread, policy));
 }
 
 UserPolicyDiskCache::~UserPolicyDiskCache() {}
 
 void UserPolicyDiskCache::LoadOnFileThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   if (!file_util::PathExists(backing_file_path_))
     return;
 
   // Read the protobuf from the file.
   std::string data;
   if (!file_util::ReadFileToString(backing_file_path_, &data)) {
     LOG(WARNING) << "Failed to read policy data from "
                  << backing_file_path_.value();
+    SampleUMA(kMetricPolicyLoadFailed);
     return;
   }
 
   // Decode it.
   em::CachedCloudPolicyResponse cached_response;
   if (!cached_response.ParseFromArray(data.c_str(), data.size())) {
     LOG(WARNING) << "Failed to parse policy data read from "
                  << backing_file_path_.value();
+    SampleUMA(kMetricPolicyLoadFailed);
     return;
   }
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this,
                         &UserPolicyDiskCache::FinishLoadOnUIThread,
                         cached_response));
 }
 
 void UserPolicyDiskCache::FinishLoadOnUIThread(
     const em::CachedCloudPolicyResponse& policy) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (delegate_.get())
     delegate_->OnDiskCacheLoaded(policy);
 }
 
 
 void UserPolicyDiskCache::StoreOnFileThread(
     const em::CachedCloudPolicyResponse& policy) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   std::string data;
   if (!policy.SerializeToString(&data)) {
     LOG(WARNING) << "Failed to serialize policy data";
+    SampleUMA(kMetricPolicyStoreFailed);
     return;
   }
 
   if (!file_util::CreateDirectory(backing_file_path_.DirName())) {
     LOG(WARNING) << "Failed to create directory "
                  << backing_file_path_.DirName().value();
+    SampleUMA(kMetricPolicyStoreFailed);
     return;
   }
 
   int size = data.size();
   if (file_util::WriteFile(backing_file_path_, data.c_str(), size) != size) {
     LOG(WARNING) << "Failed to write " << backing_file_path_.value();
+    SampleUMA(kMetricPolicyStoreFailed);
     return;
   }
 }
 
 }  // namespace policy