Retry reinstallation of corrupted policy extensions.

chrome/browser/extensions/policy_extension_reinstaller.cc

+// Copyright 2017 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/extensions/policy_extension_reinstaller.h"
+
+#include "base/bind.h"
+#include "base/memory/ptr_util.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "content/public/browser/browser_context.h"
+#include "extensions/browser/extension_system.h"
+
+namespace extensions {
+
+namespace {
+
+PolicyExtensionReinstaller::ReinstallCallback* g_reinstall_action_for_test =
+    nullptr;
+
+const net::BackoffEntry::Policy kPolicyReinstallBackoffPolicy = {
+    // num_errors_to_ignore
+    1,
+
+    // initial_delay_ms (note that we set 'always_use_initial_delay' to false
+    // below)
+    100,
+
+    // multiply_factor
+    2,
+
+    // jitter_factor
+    0.1,
+
+    // maximum_backoff_ms (30 minutes)
+    1000 * 60 * 30,
+
+    // entry_lifetime_ms (6 hours)
+    1000 * 60 * 60 * 6,
+
+    // always_use_initial_delay
+    false,
+};
+
+}  // namespace
+
+PolicyExtensionReinstaller::PolicyExtensionReinstaller(
+    content::BrowserContext* context)
+    : context_(context),
+      backoff_entry_(&kPolicyReinstallBackoffPolicy),
+      weak_factory_(this) {}
+
+PolicyExtensionReinstaller::~PolicyExtensionReinstaller() {}
+
+// static
+void PolicyExtensionReinstaller::set_policy_reinstall_action_for_test(
+    ReinstallCallback* action) {
+  g_reinstall_action_for_test = action;
+}
+
+void PolicyExtensionReinstaller::NotifyExtensionDisabledDueToCorruption() {
+  ScheduleNextReinstallAttempt();
+}
+
+void PolicyExtensionReinstaller::Fire() {
+  scheduled_fire_pending_ = false;
+  ExtensionSystem* system = ExtensionSystem::Get(context_);
+  ExtensionService* service = system->extension_service();
+  PendingExtensionManager* pending_manager =
+      service->pending_extension_manager();
+  // If there's nothing to repair, then bail out.
+  if (!pending_manager->HasAnyPolicyReinstallForCorruption())
+    return;
+
+  service->CheckForExternalUpdates();
+  ScheduleNextReinstallAttempt();
+}
+
+base::TimeDelta PolicyExtensionReinstaller::GetNextFireDelay() {
+  backoff_entry_.InformOfRequest(false);
+  return backoff_entry_.GetTimeUntilRelease();
+}
+
+void PolicyExtensionReinstaller::ScheduleNextReinstallAttempt() {
+  if (scheduled_fire_pending_)
+    return;
+
+  scheduled_fire_pending_ = true;
+  base::TimeDelta reinstall_delay = GetNextFireDelay();
+  base::Closure callback =
+      base::Bind(&PolicyExtensionReinstaller::Fire, weak_factory_.GetWeakPtr());
+  if (g_reinstall_action_for_test) {
+    g_reinstall_action_for_test->Run(callback, reinstall_delay);
+  } else {
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(FROM_HERE, callback,
+                                                         reinstall_delay);
+  }
+}
+
+}  // namespace extensions