Implement memory-persistent registration

content/browser/service_worker/service_worker_storage.cc

+// Copyright 2013 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 "content/browser/service_worker/service_worker_storage.h"
+
+#include <string>
+
+#include "base/strings/string_util.h"
+#include "content/browser/service_worker/service_worker_register_job.h"
+#include "content/browser/service_worker/service_worker_registration.h"
+#include "content/public/browser/browser_thread.h"
+#include "webkit/browser/quota/quota_manager.h"
+
+namespace content {
+
+const base::FilePath::CharType kServiceWorkerDirectory[] =
+    FILE_PATH_LITERAL("ServiceWorker");
+
+ServiceWorkerStorage::ServiceWorkerStorage(
+    const base::FilePath& path,
+    quota::QuotaManagerProxy* quota_manager_proxy)
+    : quota_manager_proxy_(quota_manager_proxy), weak_factory_(this) {
+  if (!path.empty())
+    path_ = path.Append(kServiceWorkerDirectory);
+}
+
+ServiceWorkerStorage::~ServiceWorkerStorage() {}
+
+void ServiceWorkerStorage::Shutdown() {
+  for (PatternToRegistrationMap::const_iterator iter =
+           registration_by_pattern_.begin();
+       iter != registration_by_pattern_.end();
+       ++iter) {
+    iter->second->Shutdown();
+  }
+  registration_by_pattern_.clear();
+}
+
+void ServiceWorkerStorage::FindRegistrationForPattern(
+    const GURL& pattern,
+    const RegistrationCallback& callback) {
+  PatternToRegistrationMap::const_iterator match =
+      registration_by_pattern_.find(pattern);
+  if (match == registration_by_pattern_.end()) {
+    BrowserThread::PostTask(
+        BrowserThread::IO,
+        FROM_HERE,
+        base::Bind(
+            callback,
+            REGISTRATION_NOT_FOUND,
+            static_cast<scoped_refptr<ServiceWorkerRegistration> >(NULL)));

[kinuko, 2013/11/27 03:45:23]

Just passing scoped_refptr<ServiceWorkerRegistration>() would work

[alecflett, 2013/12/02 16:11:35]

Done.

+    return;
+  }
+  BrowserThread::PostTask(BrowserThread::IO,
+                          FROM_HERE,
+                          base::Bind(callback, REGISTRATION_OK, match->second));
+}
+
+void ServiceWorkerStorage::FindRegistrationForDocument(
+    const GURL& document_url,
+    const RegistrationCallback& callback) {
+  // TODO(alecflett): This needs to be synchronous in the fast path,
+  // but asynchronous in the slow path (when the patterns have to be
+  // loaded from disk). For now it is always pessimistically async.
+  for (PatternToRegistrationMap::const_iterator it =
+           registration_by_pattern_.begin();
+       it != registration_by_pattern_.end();
+       ++it) {
+    if (PatternMatches(it->first, document_url)) {
+      BrowserThread::PostTask(
+          BrowserThread::IO,
+          FROM_HERE,
+          base::Bind(callback,
+                     REGISTRATION_OK,
+                     static_cast<scoped_refptr<ServiceWorkerRegistration> >(
+                         it->second)));

[kinuko, 2013/11/27 03:45:23]

No need of static_cast

[alecflett, 2013/12/02 16:11:35]

Done.

+      return;
+    }
+  }
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(callback,
+                 REGISTRATION_NOT_FOUND,
+                 static_cast<scoped_refptr<ServiceWorkerRegistration> >(NULL)));

[kinuko, 2013/11/27 03:45:23]

ditto

[alecflett, 2013/12/02 16:11:35]

Done.

+}
+
+namespace {
+int64 NextRegistrationId() {
+  static int64 worker_id = 0;
+  return worker_id++;
+}

[kinuko, 2013/11/27 03:45:23]

I suggested having this method as a member method because I thought we're going
to generate a new ID based a persisted value on storage, and if so we'll
eventually have this method in Storage.  Am I right?

(Otherwise could you please move this at the top, so that namespace doesn't
interleave much?)

[alecflett, 2013/12/02 16:11:35]

I think we'll have some variation on it, but it itself may end up being an
asynchronous operation (i.e. if it involves hitting the DB because it's the
first registration call, etc) so I'd prefer to just leave this near where it
will be used. 
Done.

+}  // namespace
+
+void ServiceWorkerStorage::Register(const GURL& pattern,
+                                    const GURL& script_url,
+                                    const RegistrationCallback& callback) {
+  scoped_ptr<ServiceWorkerRegisterJob> job(new ServiceWorkerRegisterJob(
+      weak_factory_.GetWeakPtr(),
+      base::Bind(&ServiceWorkerStorage::RegisterComplete,
+                 weak_factory_.GetWeakPtr(),
+                 callback)));
+  job->StartRegister(pattern, script_url);
+  registration_jobs_.push_back(job.release());
+}
+
+void ServiceWorkerStorage::Unregister(const GURL& pattern,
+                                      const UnregistrationCallback& callback) {
+  scoped_ptr<ServiceWorkerRegisterJob> job(new ServiceWorkerRegisterJob(
+      weak_factory_.GetWeakPtr(),
+      base::Bind(&ServiceWorkerStorage::UnregisterComplete,
+                 weak_factory_.GetWeakPtr(),
+                 callback)));
+  job->StartUnregister(pattern);
+  registration_jobs_.push_back(job.release());
+}
+
+scoped_refptr<ServiceWorkerRegistration> ServiceWorkerStorage::RegisterInternal(
+    const GURL& pattern,
+    const GURL& script_url) {
+
+  PatternToRegistrationMap::const_iterator current(
+      registration_by_pattern_.find(pattern));
+  DCHECK(current == registration_by_pattern_.end() ||
+         current->second->script_url() == script_url);
+
+  if (current == registration_by_pattern_.end()) {
+    scoped_refptr<ServiceWorkerRegistration> registration(
+        new ServiceWorkerRegistration(
+            pattern, script_url, NextRegistrationId()));
+    // TODO(alecflett): version upgrade path.
+    registration_by_pattern_[pattern] = registration;
+    return registration;
+  }
+
+  return current->second;
+}
+
+void ServiceWorkerStorage::UnregisterInternal(const GURL& pattern) {
+  PatternToRegistrationMap::const_iterator match =
+      registration_by_pattern_.find(pattern);
+  if (match != registration_by_pattern_.end()) {
+    match->second->Shutdown();
+    registration_by_pattern_.erase(match);
+  }
+}
+
+bool ServiceWorkerStorage::PatternMatches(const GURL& pattern,
+                                          const GURL& url) {
+  // This is a really basic, naive
+  // TODO(alecflett): Formalize what pattern matches mean.
+  // Temporarily borrowed directly from appcache::Namespace::IsMatch().
+  // We have to escape '?' characters since MatchPattern also treats those
+  // as wildcards which we don't want here, we only do '*'s.
+  std::string pattern_spec(pattern.spec());
+  if (pattern.has_query())
+    ReplaceSubstringsAfterOffset(&pattern_spec, 0, "?", "\\?");
+  return MatchPattern(url.spec(), pattern_spec);
+}
+
+void ServiceWorkerStorage::EraseJob(ServiceWorkerRegisterJob* job) {
+  ScopedVector<ServiceWorkerRegisterJob>::iterator job_position =
+      registration_jobs_.begin();
+  bool found = false;
+  for (; job_position != registration_jobs_.end(); ++job_position) {
+    if (*job_position == job) {
+      found = true;
+      registration_jobs_.erase(job_position);
+      break;

[kinuko, 2013/11/27 03:45:23]

We could return here, and

[alecflett, 2013/12/02 16:11:35]

Done.

+    }
+  }
+  DCHECK(found) << "Deleting non-existent job. ";

[kinuko, 2013/11/27 03:45:23]

put NOTREACHED() << "..." instead of checking found

[alecflett, 2013/12/02 16:11:35]

Done.

+}
+
+void ServiceWorkerStorage::UnregisterComplete(
+    const UnregistrationCallback& callback,
+    ServiceWorkerRegisterJob* job,
+    RegistrationStatus status,
+    ServiceWorkerRegistration* previous_registration) {
+  callback.Run(status);
+  EraseJob(job);
+}
+
+void ServiceWorkerStorage::RegisterComplete(
+    const RegistrationCallback& callback,
+    ServiceWorkerRegisterJob* job,
+    RegistrationStatus status,
+    ServiceWorkerRegistration* registration) {
+  callback.Run(status, registration);
+  EraseJob(job);
+}
+
+}  // namespace content