Register a Service Worker when an extension is enabled.

extensions/browser/service_worker_manager.cc

+// Copyright 2014 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 "extensions/browser/service_worker_manager.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
+#include "content/browser/service_worker/service_worker_context_core.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/storage_partition.h"
+#include "extensions/browser/extensions_browser_client.h"
+#include "extensions/common/manifest_handlers/background_info.h"
+
+namespace extensions {
+
+using base::Callback;
+using base::Closure;
+using base::WeakPtr;
+using content::BrowserContext;
+using content::BrowserThread;
+using content::ServiceWorkerStatusCode;
+
+static const char* CurrentBrowserThreadName() {
+  BrowserThread::ID id;
+  if (BrowserThread::GetCurrentThreadIdentifier(&id)) {
+    switch (id) {
+      case BrowserThread::UI:
+        return "UI";
+      case BrowserThread::DB:
+        return "DB";
+      case BrowserThread::FILE:
+        return "FILE";
+      case BrowserThread::FILE_USER_BLOCKING:
+        return "FILE_USER_BLOCKING";
+      case BrowserThread::PROCESS_LAUNCHER:
+        return "PROCESS_LAUNCHER";
+      case BrowserThread::CACHE:
+        return "CACHE";
+      case BrowserThread::IO:
+        return "IO";
+      default:
+        break;
+    }
+  }
+  return "Unknown";
+}
+
+static void DCheckCurrentlyOn(BrowserThread::ID thread) {
+  DCHECK(BrowserThread::CurrentlyOn(thread)) << CurrentBrowserThreadName();

[scheib, 2014/03/10 21:31:38]

Maybe base::MessageLoop::current()->thread_name();

+}
+
+ServiceWorkerManager::State::State() {}
+ServiceWorkerManager::State::~State() {}
+
+ServiceWorkerManager::ServiceWorkerManager(BrowserContext* context)
+    : context_(context), weak_this_factory_(this) {}
+ServiceWorkerManager::~ServiceWorkerManager() {}
+
+ServiceWorkerManager* ServiceWorkerManager::Get(
+    content::BrowserContext* context) {
+  return ServiceWorkerManagerFactory::GetForBrowserContext(context);
+}
+
+content::StoragePartition* ServiceWorkerManager::GetStoragePartition(
+    const Extension* ext) const {
+  return content::BrowserContext::GetStoragePartitionForSite(
+      context_, Extension::GetBaseURLFromExtensionId(ext->id()));
+}
+
+scoped_refptr<content::ServiceWorkerContextWrapper>
+ServiceWorkerManager::GetSWContext(const Extension* ext) const {
+  return GetStoragePartition(ext)->GetServiceWorkerContext();
+}
+
+template <typename Arg1>
+static void RunCallback1(const Callback<void(Arg1)>& callback,
+                         const Arg1& arg1) {
+  callback.Run(arg1);
+}
+
+static void FinishRegister(
+    const Callback<void(ServiceWorkerStatusCode)>& continuation,
+    content::ServiceWorkerStatusCode status,
+    int64 registration_id) {
+  DCheckCurrentlyOn(BrowserThread::IO);
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&RunCallback1<ServiceWorkerStatusCode>, continuation, status));

[kinuko, 2014/03/10 07:03:19]

nit: why don't we just do base::Bind(continuation, status) ?

+}
+
+static void DoRegister(
+    const scoped_refptr<content::ServiceWorkerContextWrapper>&
+        service_worker_context,
+    const ExtensionId& extension_id,
+    const GURL& service_worker_script,
+    const Callback<void(ServiceWorkerStatusCode)>& continuation) {
+  DCheckCurrentlyOn(BrowserThread::IO);
+  service_worker_context->context()->RegisterServiceWorker(
+      Extension::GetBaseURLFromExtensionId(extension_id).Resolve("/*"),
+      service_worker_script,
+      -1,
+      base::Bind(&FinishRegister, continuation));
+}
+
+// alecflett says that if we send a series of RegisterServiceWorker and
+// UnregisterServiceWorker calls to a ServiceWorkerContextCore, we're guaranteed
+// that the callbacks come back in the same order, and that the last one will be

[michaeln, 2014/03/10 22:15:03]

That order is guaranteed for the same 'scope', but not for operations on
different registrations. The order in which foo.com and boo.com's registrations
complete may be different then the order in which they started.

Looks like that's what you mean from comment about the final state... just
checking.

+// the final state.
+void ServiceWorkerManager::RegisterExtension(const Extension* extension) {
+  DCheckCurrentlyOn(BrowserThread::UI);
+  CHECK(BackgroundInfo::HasServiceWorker(extension));
+  State& ext_state = states_[extension->id()];
+  if (ext_state.registration == REGISTERING ||
+      ext_state.registration == REGISTERED)
+    return;
+  ext_state.registration = REGISTERING;
+  ++ext_state.outstanding_state_changes;
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&DoRegister,
+                 GetSWContext(extension),
+                 extension->id(),
+                 extension->GetResourceURL(
+                     BackgroundInfo::GetServiceWorkerScript(extension)),
+                 base::Bind(&ServiceWorkerManager::FinishRegistration,
+                            WeakThis(),
+                            extension->id())));
+}
+
+void ServiceWorkerManager::FinishRegistration(const ExtensionId& extension_id,
+                                              ServiceWorkerStatusCode result) {
+  DCheckCurrentlyOn(BrowserThread::UI);
+  State& ext_state = states_[extension_id];
+  --ext_state.outstanding_state_changes;
+  DCHECK_GE(ext_state.outstanding_state_changes, 0);
+  if (ext_state.outstanding_state_changes > 0)
+    return;
+
+  DCHECK_EQ(ext_state.registration, REGISTERING);
+  std::vector<Closure> to_run;
+  switch (result) {
+    case content::SERVICE_WORKER_OK:
+      ext_state.registration = REGISTERED;
+      to_run.swap(ext_state.registration_succeeded);
+      ext_state.registration_failed.clear();
+      break;
+    default:
+      LOG(ERROR) << "Service Worker Registration failed for extension "
+                 << extension_id << ": "
+                 << content::ServiceWorkerStatusToString(result);
+      to_run.swap(ext_state.registration_failed);
+      states_.erase(extension_id);
+      break;
+  }
+
+  for (size_t i = 0; i < to_run.size(); ++i) {
+    to_run[i].Run();
+  }
+}
+
+static void FinishUnregister(
+    const Callback<void(ServiceWorkerStatusCode)>& continuation,
+    content::ServiceWorkerStatusCode status) {
+  DCheckCurrentlyOn(BrowserThread::IO);
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&RunCallback1<ServiceWorkerStatusCode>, continuation, status));
+}
+
+static void DoUnregister(
+    const scoped_refptr<content::ServiceWorkerContextWrapper>&
+        service_worker_context,
+    const ExtensionId& extension_id,
+    const Callback<void(ServiceWorkerStatusCode)>& continuation) {
+  DCheckCurrentlyOn(BrowserThread::IO);
+  service_worker_context->context()->UnregisterServiceWorker(
+      Extension::GetBaseURLFromExtensionId(extension_id).Resolve("/*"),
+      -1,
+      base::Bind(&FinishUnregister, continuation));
+}
+
+void ServiceWorkerManager::UnregisterExtension(const Extension* extension) {
+  DCheckCurrentlyOn(BrowserThread::UI);
+  CHECK(BackgroundInfo::HasServiceWorker(extension));
+
+  base::hash_map<ExtensionId, State>::iterator it =
+      states_.find(extension->id());
+  if (it == states_.end()) {
+    // Extension isn't registered.
+    return;
+  }
+  State& ext_state = it->second;
+  if (ext_state.registration == UNREGISTERING)
+    return;
+
+  ext_state.registration = UNREGISTERING;
+  ++ext_state.outstanding_state_changes;
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&DoUnregister,
+                 GetSWContext(extension),
+                 extension->id(),
+                 base::Bind(&ServiceWorkerManager::FinishUnregistration,
+                            WeakThis(),
+                            extension->id())));
+}
+
+void ServiceWorkerManager::FinishUnregistration(
+    const ExtensionId& extension_id,
+    ServiceWorkerStatusCode result) {
+  DCheckCurrentlyOn(BrowserThread::UI);
+  State& ext_state = states_[extension_id];
+  --ext_state.outstanding_state_changes;
+  DCHECK_GE(ext_state.outstanding_state_changes, 0);
+  if (ext_state.outstanding_state_changes > 0)
+    return;
+
+  DCHECK_EQ(ext_state.registration, UNREGISTERING);
+  std::vector<Closure> to_run;
+  switch (result) {
+    case content::SERVICE_WORKER_OK:
+      to_run.swap(ext_state.unregistration_succeeded);
+      states_.erase(extension_id);
+      break;
+    default:
+      LOG(ERROR) << "Service Worker Unregistration failed for extension "
+                 << extension_id << ": "
+                 << content::ServiceWorkerStatusToString(result);
+      ext_state.registration = REGISTERED;
+      to_run.swap(ext_state.unregistration_failed);
+      ext_state.unregistration_succeeded.clear();
+      break;
+  }
+
+  for (size_t i = 0; i < to_run.size(); ++i) {
+    to_run[i].Run();
+  }
+}
+
+WeakPtr<ServiceWorkerManager> ServiceWorkerManager::WeakThis() {
+  return weak_this_factory_.GetWeakPtr();
+}
+
+// ServiceWorkerManagerFactory
+
+ServiceWorkerManager* ServiceWorkerManagerFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
+  return static_cast<ServiceWorkerManager*>(
+      GetInstance()->GetServiceForBrowserContext(context, true));
+}
+
+ServiceWorkerManagerFactory* ServiceWorkerManagerFactory::GetInstance() {
+  return Singleton<ServiceWorkerManagerFactory>::get();
+}
+
+void ServiceWorkerManagerFactory::SetInstanceForTesting(
+    content::BrowserContext* context,
+    ServiceWorkerManager* manager) {
+  Associate(context, manager);
+}
+
+ServiceWorkerManagerFactory::ServiceWorkerManagerFactory()
+    : BrowserContextKeyedServiceFactory(
+          "ServiceWorkerManager",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+ServiceWorkerManagerFactory::~ServiceWorkerManagerFactory() {}
+
+BrowserContextKeyedService*
+ServiceWorkerManagerFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new ServiceWorkerManager(context);
+}
+
+// TODO(jyasskin): Deal with incognito mode.
+content::BrowserContext* ServiceWorkerManagerFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return ExtensionsBrowserClient::Get()->GetOriginalContext(context);
+}
+
+}  // namespace extensions