Reporting of policy errors via host-offline-reason: part 1

remoting/host/policy_hack/policy_watcher.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.
 
 // Most of this code is copied from:
 //   src/chrome/browser/policy/asynchronous_policy_loader.{h,cc}
 
 #include "remoting/host/policy_hack/policy_watcher.h"
 
 #include "base/bind.h"
@@ skipping 100 matching lines @@
 
 const char PolicyWatcher::kUdpPortRangePolicyName[] =
     "RemoteAccessHostUdpPortRange";
 
 const char PolicyWatcher::kHostDebugOverridePoliciesName[] =
     "RemoteAccessHostDebugOverridePolicies";
 
 PolicyWatcher::PolicyWatcher(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : task_runner_(task_runner),
+      transient_policy_error_retry_counter_(0),
       old_policies_(new base::DictionaryValue()),
       default_values_(new base::DictionaryValue()),
       weak_factory_(this) {
   // Initialize the default values for each policy.
   default_values_->SetBoolean(kNatPolicyName, true);
   default_values_->SetBoolean(kHostRequireTwoFactorPolicyName, false);
   default_values_->SetBoolean(kHostRequireCurtainPolicyName, false);
   default_values_->SetBoolean(kHostMatchUsernamePolicyName, false);
   default_values_->SetString(kHostDomainPolicyName, std::string());
   default_values_->SetString(kHostTalkGadgetPrefixPolicyName,
@@ skipping 13 matching lines @@
   // Initialize the fall-back values to use for unreadable policies.
   // For most policies these match the defaults.
   bad_type_values_.reset(default_values_->DeepCopy());
   bad_type_values_->SetBoolean(kNatPolicyName, false);
   bad_type_values_->SetBoolean(kRelayPolicyName, false);
 }
 
 PolicyWatcher::~PolicyWatcher() {
 }
 
-void PolicyWatcher::StartWatching(const PolicyCallback& policy_callback) {
+void PolicyWatcher::StartWatching(
+    const PolicyUpdatedCallback& policy_updated_callback,
+    const PolicyErrorCallback& policy_error_callback) {
   if (!OnPolicyWatcherThread()) {
     task_runner_->PostTask(FROM_HERE,
                            base::Bind(&PolicyWatcher::StartWatching,
                                       base::Unretained(this),
-                                      policy_callback));
+                                      policy_updated_callback,
+                                      policy_error_callback));
     return;
   }
 
-  policy_callback_ = policy_callback;
+  policy_updated_callback_ = policy_updated_callback;
+  policy_error_callback_ = policy_error_callback;
   StartWatchingInternal();
 }
 
 void PolicyWatcher::StopWatching(const base::Closure& stopped_callback) {
   task_runner_->PostTaskAndReply(
       FROM_HERE, base::Bind(&PolicyWatcher::StopWatchingOnPolicyWatcherThread,
                             base::Unretained(this)),
       stopped_callback);
 }
 
 void PolicyWatcher::StopWatchingOnPolicyWatcherThread() {
   StopWatchingInternal();
   weak_factory_.InvalidateWeakPtrs();
-  policy_callback_.Reset();
+  policy_updated_callback_.Reset();
+  policy_error_callback_.Reset();
 }
 
 void PolicyWatcher::ScheduleFallbackReloadTask() {
   DCHECK(OnPolicyWatcherThread());
   ScheduleReloadTask(
       base::TimeDelta::FromMinutes(kFallbackReloadDelayMinutes));
 }
 
 void PolicyWatcher::ScheduleReloadTask(const base::TimeDelta& delay) {
   DCHECK(OnPolicyWatcherThread());
   task_runner_->PostDelayedTask(
       FROM_HERE,
       base::Bind(&PolicyWatcher::Reload, weak_factory_.GetWeakPtr()),
       delay);
 }
 
 const base::DictionaryValue& PolicyWatcher::Defaults() const {
   return *default_values_;
 }
 
 bool PolicyWatcher::OnPolicyWatcherThread() const {
   return task_runner_->BelongsToCurrentThread();
 }
 
 void PolicyWatcher::UpdatePolicies(
     const base::DictionaryValue* new_policies_raw) {
   DCHECK(OnPolicyWatcherThread());
 
+  transient_policy_error_retry_counter_ = 0;
+
   // Use default values for any missing policies.
   scoped_ptr<base::DictionaryValue> new_policies =
       CopyGoodValuesAndAddDefaults(
           new_policies_raw, default_values_.get(), bad_type_values_.get());
 
   // Find the changed policies.
   scoped_ptr<base::DictionaryValue> changed_policies(
       new base::DictionaryValue());
   base::DictionaryValue::Iterator iter(*new_policies);
   while (!iter.IsAtEnd()) {
     base::Value* old_policy;
     if (!(old_policies_->Get(iter.key(), &old_policy) &&
           old_policy->Equals(&iter.value()))) {
       changed_policies->Set(iter.key(), iter.value().DeepCopy());
     }
     iter.Advance();
   }
 
   // Save the new policies.
   old_policies_.swap(new_policies);
 
   // Notify our client of the changed policies.
   if (!changed_policies->empty()) {
-    policy_callback_.Run(changed_policies.Pass());
+    policy_updated_callback_.Run(changed_policies.Pass());
   }
 }
 
+void PolicyWatcher::SignalPolicyError() {
+  transient_policy_error_retry_counter_ = 0;
+  policy_error_callback_.Run();
+}
+
+void PolicyWatcher::SignalTransientPolicyError() {
+  const int kMaxRetryCount = 5;
+  transient_policy_error_retry_counter_ += 1;
+  if (transient_policy_error_retry_counter_ >= kMaxRetryCount) {
+    SignalPolicyError();
+  }
+}
+
 }  // namespace policy_hack
 }  // namespace remoting