DNR Prototype: With flatbuffers

extensions/browser/api/declarative_net_request/matcher_util.h

Index: extensions/browser/api/declarative_net_request/matcher_util.h
diff --git a/extensions/browser/api/declarative_net_request/matcher_util.h b/extensions/browser/api/declarative_net_request/matcher_util.h
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+++ b/extensions/browser/api/declarative_net_request/matcher_util.h
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+// 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.
+
+#ifndef EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_MATCHER_UTIL_H_
+#define EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_MATCHER_UTIL_H_
+
+#include <memory>
+#include "components/subresource_filter/core/common/url_pattern_index.h"
+#include "content/public/browser/browser_thread.h"
+#include "extensions/common/api/declarative_net_request/constants.h"
+
+namespace net {
+class URLRequest;
+}
+
+namespace base {
+class MemoryMappedFile;
+class FilePath;
+}
+
+class GURL;
+
+namespace url {
+class Origin;
+}
+
+namespace extensions {
+class InfoMap;
+
+namespace declarative_net_request {
+
+namespace flat {
+struct ExtensionIndexedRuleset;
+struct ExtensionRuleMetadata;
+}
+
+// This is created on the file thread and used on the IO thread. However,
+// there are no thread safety issues since this is only accessed on a single
+// thread at a time.
+class ExtensionIndexedRulesetMatcher {
+ public:
+  // We should ensure that the buffer passed has been verified.
+  explicit ExtensionIndexedRulesetMatcher(
+      std::unique_ptr<base::MemoryMappedFile,
+                      content::BrowserThread::DeleteOnFileThread> ruleset_file);
+
+  bool ShouldBlockRequest(const GURL& url,
+                          const url::Origin& first_party_origin,
+                          ElementType element_type,
+                          bool is_third_party);
+
+ private:
+  using UrlPatternIndexMatcher = subresource_filter::UrlPatternIndexMatcher;
+  using ExtensionRuleMetadataList =
+      flatbuffers::Vector<flatbuffers::Offset<flat::ExtensionRuleMetadata>>;
+
+  // This owns the actual buffer. Are there any potential issues of using
+  // DeleteOnFileThread.
+  std::unique_ptr<base::MemoryMappedFile,
+                  content::BrowserThread::DeleteOnFileThread>
+      ruleset_file_;
+  const flat::ExtensionIndexedRuleset* root_;
+  const UrlPatternIndexMatcher blacklist_matcher_;
+  const UrlPatternIndexMatcher whitelist_matcher_;
+  const UrlPatternIndexMatcher redirect_matcher_;
+  const ExtensionRuleMetadataList* extension_metdata_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionIndexedRulesetMatcher);
+};
+
+std::unique_ptr<ExtensionIndexedRulesetMatcher>
+CreateVerifiedExtensionIndexedRulesetMatcher(
+    const base::FilePath& indexed_ruleset_path);
+
+bool ShouldBlockRequest(void* BrowserContext,
+                        const InfoMap* info_map,
+                        net::URLRequest* request);
+
+}  // namespace declarative_net_request
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_MATCHER_UTIL_H_