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3516a2344f
This adds a disk cache for HTTP responses received from the network. For now, we take a rather conservative approach to caching. We don't cache a response until we're 100% sure it is cacheable (there are heuristics we can implement in the future based on the absence of specific headers). The cache is broken into 2 categories of files: 1. An index file. This is a SQL database containing metadata about each cache entry (URL, timestamps, etc.). 2. Cache files. Each cached response is in its own file. The file is an amalgamation of all info needed to reconstruct an HTTP response. This includes the status code, headers, body, etc. A cache entry is created once we receive the headers for a response. The index, however, is not updated at this point. We stream the body into the cache entry as it is received. Once we've successfully cached the entire body, we create an index entry in the database. If any of these steps failed along the way, the cache entry is removed and the index is left untouched. Subsequent requests are checked for cache hits from the index. If a hit is found, we read just enough of the cache entry to inform WebContent of the status code and headers. The body of the response is piped to WC via syscalls, such that the transfer happens entirely in the kernel; no need to allocate the memory for the body in userspace (WC still allocates a buffer to hold the data, of course). If an error occurs while piping the body, we currently error out the request. There is a FIXME to switch to a network request. Cache hits are also validated for freshness before they are used. If a response has expired, we remove it and its index entry, and proceed with a network request.
27 lines
791 B
C++
27 lines
791 B
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/StringView.h>
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#include <AK/Time.h>
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#include <AK/Types.h>
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#include <LibHTTP/HeaderMap.h>
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#include <LibURL/Forward.h>
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namespace RequestServer {
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String serialize_url_for_cache_storage(URL::URL const&);
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u64 create_cache_key(StringView url, StringView method);
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bool is_cacheable(StringView method, u32 status_code, HTTP::HeaderMap const&);
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bool is_header_exempted_from_storage(StringView name);
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AK::Duration calculate_freshness_lifetime(HTTP::HeaderMap const&);
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AK::Duration calculate_age(HTTP::HeaderMap const&, UnixDateTime request_time, UnixDateTime response_time);
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bool is_response_fresh(AK::Duration freshness_lifetime, AK::Duration current_age);
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}
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