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GPT on behalf of DHH
ac73267b07
Transfer the C completed-response cache lesson into Rails, keeping authentication, room checks and cookies per request. A persistent read-only SQLite observer detects local and foreign commits and rejects racing admission. Whole-page misses render fresh to avoid stale nested fragments; message ETags reflect token-neutral presentation.
58 lines
2.1 KiB
Ruby
58 lines
2.1 KiB
Ruby
require "test_helper"
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require "tmpdir"
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class ResponseCacheTest < ActiveSupport::TestCase
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setup do
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@directory = Dir.mktmpdir
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@database = File.join(@directory, "cache.sqlite3")
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SQLite3::Database.new(@database) do |database|
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database.execute("PRAGMA journal_mode=WAL")
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database.execute("CREATE TABLE values_for_test (value TEXT)")
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end
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ActiveRecord::Base.stubs(:connection_db_config).returns(Struct.new(:database).new(@database))
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@cache = ResponseCache.new
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@cache.stubs(:budget).returns(1024)
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end
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teardown do
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@cache.clear
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FileUtils.remove_entry(@directory)
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end
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test "foreign commits expire entries and reject old render admission" do
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version = @cache.version
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@cache.write("page", version, entry("first"))
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assert_equal "first", @cache.read("page", version)[:body]
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SQLite3::Database.new(@database) { |database| database.execute("INSERT INTO values_for_test VALUES ('committed')") }
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assert_nil @cache.read("page", version)
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@cache.write("page", version, entry("old in-flight render"))
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assert_nil @cache.read("page", @cache.version)
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@cache.write("page", @cache.version, entry("fresh"))
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assert_equal "fresh", @cache.read("page", @cache.version)[:body]
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end
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test "byte budget evicts oldest and bypasses oversized entries and keys" do
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version = @cache.version
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@cache.stubs(:budget).returns(512)
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@cache.write("first", version, entry("a" * 100))
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@cache.write("second", version, entry("b" * 100))
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assert_nil @cache.read("first", version)
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assert_equal "b" * 100, @cache.read("second", version)[:body]
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@cache.write("oversized", version, entry("c" * 1000))
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assert_nil @cache.read("oversized", version)
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@cache.write("k" * 2049, version, entry("small"))
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assert_nil @cache.read("k" * 2049, version)
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end
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test "observer namespaces cannot reuse old shared fragment keys after restart" do
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version = @cache.version
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@cache.clear
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assert_not_equal version, @cache.version
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end
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private
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def entry(body)
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{ body: body, marker: "unexposed-marker", headers: {} }
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end
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end
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