Show data usage on Site Details (MDSettings)

chrome/browser/ui/webui/settings/site_settings_handler.cc

+// Copyright (c) 2016 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/ui/webui/settings/site_settings_handler.h"
+
+#include "base/bind.h"

[michaelpg, 2016/01/19 20:47:54]

nit: include values.h

[Finnur, 2016/01/22 15:07:35]

Done.

+#include "chrome/browser/content_settings/storage_info_fetcher.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+#include "content/public/browser/storage_partition.h"
+#include "content/public/browser/web_ui.h"
+#include "ui/base/text/bytes_formatting.h"
+
+// Handles fetching StorageInfo and report back to the SiteSettingsHandler.
+class MDSettingsStorageInfoFetcher : public StorageInfoFetcher {

[michaelpg, 2016/01/19 20:47:54]

discussion question: Would it be better to compose and observe a
StorageInfoFetcher instead of inheriting from it?

[Finnur, 2016/01/22 15:07:35]

Yeah, I like that.

+ public:
+  MDSettingsStorageInfoFetcher(storage::QuotaManager* quota_manager,
+                               content::WebUI* web_ui,
+                               const std::string& host)
+    : StorageInfoFetcher(quota_manager),
+      web_ui_(web_ui),
+      host_(host) {}
+
+ protected:
+  void OnGetUsageInfo(const storage::UsageInfoEntries& entries) override {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+    storage::UsageInfoEntries::const_iterator i;
+    for (i = entries.begin(); i != entries.end(); ++i) {
+      if (i->usage <= 0) continue;
+      if (i->host == host_) {
+        web_ui_->CallJavascriptFunction(
+           "SiteSettingsHandler.OnUsageDataAvailable",
+           base::StringValue(ui::FormatBytes(i->usage)));
+        return;
+      }
+    }
+  }
+
+ private:
+  ~MDSettingsStorageInfoFetcher() override {}
+
+  content::WebUI* web_ui_;
+  std::string host_;
+
+  DISALLOW_COPY_AND_ASSIGN(MDSettingsStorageInfoFetcher);
+};
+
+namespace settings {
+
+SiteSettingsHandler::SiteSettingsHandler(Profile* profile)
+    : profile_(profile) {
+}
+
+SiteSettingsHandler::~SiteSettingsHandler() {
+}
+
+void SiteSettingsHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "fetchUsageTotal",
+      base::Bind(&SiteSettingsHandler::HandleFetchUsageTotal,
+                 base::Unretained(this)));
+}
+
+void SiteSettingsHandler::HandleFetchUsageTotal(
+    const base::ListValue* args) {
+  CHECK_EQ(1U, args->GetSize());
+  std::string origin;
+  CHECK(args->GetString(0, &origin));
+  GURL url(origin);
+  if (url.is_valid()) {
+    scoped_refptr<MDSettingsStorageInfoFetcher> storage_info_fetcher(
+        new MDSettingsStorageInfoFetcher(
+            content::BrowserContext::GetDefaultStoragePartition(
+                profile_)->GetQuotaManager(), web_ui(), url.host()));
+    storage_info_fetcher->Run();
+  }
+}
+
+}  // namespace settings