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// 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 "chrome/browser/policy/policy_service_impl.h"
#include <algorithm>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/stl_util.h"
#include "chrome/browser/policy/policy_domain_descriptor.h"
#include "chrome/browser/policy/policy_map.h"
namespace policy {
typedef PolicyServiceImpl::Providers::const_iterator Iterator;
PolicyServiceImpl::PolicyServiceImpl(const Providers& providers)
: update_task_ptr_factory_(this) {
for (int domain = 0; domain < POLICY_DOMAIN_SIZE; ++domain)
initialization_complete_[domain] = true;
providers_ = providers;
for (Iterator it = providers.begin(); it != providers.end(); ++it) {
ConfigurationPolicyProvider* provider = *it;
provider->AddObserver(this);
for (int domain = 0; domain < POLICY_DOMAIN_SIZE; ++domain) {
initialization_complete_[domain] &=
provider->IsInitializationComplete(static_cast<PolicyDomain>(domain));
}
}
// There are no observers yet, but calls to GetPolicies() should already get
// the processed policy values.
MergeAndTriggerUpdates();
}
PolicyServiceImpl::~PolicyServiceImpl() {
for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
(*it)->RemoveObserver(this);
STLDeleteValues(&observers_);
}
void PolicyServiceImpl::AddObserver(PolicyDomain domain,
PolicyService::Observer* observer) {
Observers*& list = observers_[domain];
if (!list)
list = new Observers();
list->AddObserver(observer);
}
void PolicyServiceImpl::RemoveObserver(PolicyDomain domain,
PolicyService::Observer* observer) {
ObserverMap::iterator it = observers_.find(domain);
if (it == observers_.end()) {
NOTREACHED();
return;
}
it->second->RemoveObserver(observer);
if (!it->second->might_have_observers()) {
delete it->second;
observers_.erase(it);
}
}
void PolicyServiceImpl::RegisterPolicyDomain(
scoped_refptr<const PolicyDomainDescriptor> descriptor) {
domain_descriptors_[descriptor->domain()] = descriptor;
for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
(*it)->RegisterPolicyDomain(descriptor);
}
const PolicyMap& PolicyServiceImpl::GetPolicies(
const PolicyNamespace& ns) const {
return policy_bundle_.Get(ns);
}
scoped_refptr<const PolicyDomainDescriptor>
PolicyServiceImpl::GetPolicyDomainDescriptor(PolicyDomain domain) const {
return domain_descriptors_[domain];
}
bool PolicyServiceImpl::IsInitializationComplete(PolicyDomain domain) const {
DCHECK(domain >= 0 && domain < POLICY_DOMAIN_SIZE);
return initialization_complete_[domain];
}
void PolicyServiceImpl::RefreshPolicies(const base::Closure& callback) {
if (!callback.is_null())
refresh_callbacks_.push_back(callback);
if (providers_.empty()) {
// Refresh is immediately complete if there are no providers. See the note
// on OnUpdatePolicy() about why this is a posted task.
update_task_ptr_factory_.InvalidateWeakPtrs();
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&PolicyServiceImpl::MergeAndTriggerUpdates,
update_task_ptr_factory_.GetWeakPtr()));
} else {
// Some providers might invoke OnUpdatePolicy synchronously while handling
// RefreshPolicies. Mark all as pending before refreshing.
for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
refresh_pending_.insert(*it);
for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
(*it)->RefreshPolicies();
}
}
void PolicyServiceImpl::OnUpdatePolicy(ConfigurationPolicyProvider* provider) {
DCHECK_EQ(1, std::count(providers_.begin(), providers_.end(), provider));
refresh_pending_.erase(provider);
// Note: a policy change may trigger further policy changes in some providers.
// For example, disabling SigninAllowed would cause the CloudPolicyManager to
// drop all its policies, which makes this method enter again for that
// provider.
//
// Therefore this update is posted asynchronously, to prevent reentrancy in
// MergeAndTriggerUpdates. Also, cancel a pending update if there is any,
// since both will produce the same PolicyBundle.
update_task_ptr_factory_.InvalidateWeakPtrs();
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&PolicyServiceImpl::MergeAndTriggerUpdates,
update_task_ptr_factory_.GetWeakPtr()));
}
void PolicyServiceImpl::NotifyNamespaceUpdated(
const PolicyNamespace& ns,
const PolicyMap& previous,
const PolicyMap& current) {
ObserverMap::iterator iterator = observers_.find(ns.domain);
if (iterator != observers_.end()) {
FOR_EACH_OBSERVER(PolicyService::Observer,
*iterator->second,
OnPolicyUpdated(ns, previous, current));
}
}
void PolicyServiceImpl::MergeAndTriggerUpdates() {
// Merge from each provider in their order of priority.
PolicyBundle bundle;
for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
bundle.MergeFrom((*it)->policies());
// Swap first, so that observers that call GetPolicies() see the current
// values.
policy_bundle_.Swap(&bundle);
// Only notify observers of namespaces that have been modified.
const PolicyMap kEmpty;
PolicyBundle::const_iterator it_new = policy_bundle_.begin();
PolicyBundle::const_iterator end_new = policy_bundle_.end();
PolicyBundle::const_iterator it_old = bundle.begin();
PolicyBundle::const_iterator end_old = bundle.end();
while (it_new != end_new && it_old != end_old) {
if (it_new->first < it_old->first) {
// A new namespace is available.
NotifyNamespaceUpdated(it_new->first, kEmpty, *it_new->second);
++it_new;
} else if (it_old->first < it_new->first) {
// A previously available namespace is now gone.
NotifyNamespaceUpdated(it_old->first, *it_old->second, kEmpty);
++it_old;
} else {
if (!it_new->second->Equals(*it_old->second)) {
// An existing namespace's policies have changed.
NotifyNamespaceUpdated(it_new->first, *it_old->second, *it_new->second);
}
++it_new;
++it_old;
}
}
// Send updates for the remaining new namespaces, if any.
for (; it_new != end_new; ++it_new)
NotifyNamespaceUpdated(it_new->first, kEmpty, *it_new->second);
// Sends updates for the remaining removed namespaces, if any.
for (; it_old != end_old; ++it_old)
NotifyNamespaceUpdated(it_old->first, *it_old->second, kEmpty);
CheckInitializationComplete();
CheckRefreshComplete();
}
void PolicyServiceImpl::CheckInitializationComplete() {
// Check if all the providers just became initialized for each domain; if so,
// notify that domain's observers.
for (int domain = 0; domain < POLICY_DOMAIN_SIZE; ++domain) {
if (initialization_complete_[domain])
continue;
PolicyDomain policy_domain = static_cast<PolicyDomain>(domain);
bool all_complete = true;
for (Iterator it = providers_.begin(); it != providers_.end(); ++it) {
if (!(*it)->IsInitializationComplete(policy_domain)) {
all_complete = false;
break;
}
}
if (all_complete) {
initialization_complete_[domain] = true;
ObserverMap::iterator iter = observers_.find(policy_domain);
if (iter != observers_.end()) {
FOR_EACH_OBSERVER(PolicyService::Observer,
*iter->second,
OnPolicyServiceInitialized(policy_domain));
}
}
}
}
void PolicyServiceImpl::CheckRefreshComplete() {
// Invoke all the callbacks if a refresh has just fully completed.
if (refresh_pending_.empty() && !refresh_callbacks_.empty()) {
std::vector<base::Closure> callbacks;
callbacks.swap(refresh_callbacks_);
std::vector<base::Closure>::iterator it;
for (it = callbacks.begin(); it != callbacks.end(); ++it)
it->Run();
}
}
} // namespace policy
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