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GPT on behalf of DHH
89 lines
3.1 KiB
Ruby
89 lines
3.1 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 "clearing the observer gives later pages a distinct namespace" 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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test "cold renders coalesce without holding the observer mutex" do
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version = @cache.version
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entered = Queue.new
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release = Queue.new
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first = Thread.new do
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@cache.synchronize_render("page", version) do
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entered << true
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release.pop
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@cache.write("page", version, entry("completed render"))
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end
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end
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entered.pop
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second_started = Queue.new
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second = Thread.new do
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second_started << true
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@cache.synchronize_render("page", version) { @cache.read("page", version) }
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end
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second_started.pop
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deadline = Process.clock_gettime(Process::CLOCK_MONOTONIC) + 2
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Thread.pass until second.status == "sleep" || Process.clock_gettime(Process::CLOCK_MONOTONIC) >= deadline
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assert_equal "sleep", second.status
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assert_nil @cache.read("page", version)
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assert_equal version, @cache.version
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release << true
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first.value
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assert_equal "completed render", second.value[:body]
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ensure
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release << true if release
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[ first, second ].compact.each { |thread| thread.join(2) }
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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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