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a4e3890c05
When a request becomes stale, we will now issue a revalidation request (if the response indicates it may be revalidated). We do this by issuing a normal fetch request, with If-None-Match and/or If-Modified-Since request headers. If the server replies with an HTTP 304 status, we update the stored response headers to match the 304's headers, and serve the response to the client from the cache. If the server replies with any other code, we remove the cache entry. We will open a new cache entry to cache the new response, if possible.
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Error.h>
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#include <AK/HashMap.h>
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#include <AK/Time.h>
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#include <AK/Types.h>
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#include <LibDatabase/Database.h>
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#include <LibHTTP/HeaderMap.h>
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namespace RequestServer {
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// The cache index is a SQL database containing metadata about each cache entry. An entry in the index is created once
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// the entire cache entry has been successfully written to disk.
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class CacheIndex {
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struct Entry {
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u64 cache_key { 0 };
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String url;
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HTTP::HeaderMap response_headers;
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u64 data_size { 0 };
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UnixDateTime request_time;
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UnixDateTime response_time;
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UnixDateTime last_access_time;
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};
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public:
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static ErrorOr<CacheIndex> create(Database::Database&);
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void create_entry(u64 cache_key, String url, HTTP::HeaderMap, u64 data_size, UnixDateTime request_time, UnixDateTime response_time);
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void remove_entry(u64 cache_key);
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void remove_all_entries();
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Optional<Entry&> find_entry(u64 cache_key);
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void update_response_headers(u64 cache_key, HTTP::HeaderMap);
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void update_last_access_time(u64 cache_key);
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private:
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struct Statements {
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Database::StatementID insert_entry { 0 };
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Database::StatementID remove_entry { 0 };
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Database::StatementID remove_all_entries { 0 };
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Database::StatementID select_entry { 0 };
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Database::StatementID update_response_headers { 0 };
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Database::StatementID update_last_access_time { 0 };
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};
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CacheIndex(Database::Database&, Statements);
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Database::Database& m_database;
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Statements m_statements;
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HashMap<u32, Entry> m_entries;
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};
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}
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