8410d33b49
It is possible to cache a Regexp object, but I'm not sure what happens if e.g. that object remains in cache across two different Ruby versions. Caching a string seems to raise fewer questions.
65 lines
1.6 KiB
Ruby
65 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# == Schema Information
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#
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# Table name: glitch_keyword_mutes
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#
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# id :integer not null, primary key
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# account_id :integer not null
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# keyword :string not null
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# whole_word :boolean default(TRUE), not null
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# created_at :datetime not null
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# updated_at :datetime not null
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#
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class Glitch::KeywordMute < ApplicationRecord
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belongs_to :account, required: true
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validates_presence_of :keyword
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after_commit :invalidate_cached_matcher
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def self.matcher_for(account_id)
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Matcher.new(account_id)
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end
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private
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def invalidate_cached_matcher
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Rails.cache.delete("keyword_mutes:regex:#{account_id}")
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end
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class Matcher
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attr_reader :account_id
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attr_reader :regex
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def initialize(account_id)
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@account_id = account_id
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regex_text = Rails.cache.fetch("keyword_mutes:regex:#{account_id}") { regex_text_for_account }
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@regex = /#{regex_text}/i unless regex_text.empty?
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end
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def keywords
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Glitch::KeywordMute.where(account_id: account_id).select(:keyword, :id, :whole_word)
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end
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def regex_text_for_account
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[].tap do |arr|
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keywords.find_each do |kw|
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arr << (kw.whole_word ? boundary_regex_for_keyword(kw.keyword) : Regexp.escape(kw.keyword))
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end
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end.join('|')
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end
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def boundary_regex_for_keyword(keyword)
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sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
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eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
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"#{sb}#{Regexp.escape(keyword)}#{eb}"
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end
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def =~(str)
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regex ? regex =~ str : nil
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end
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end
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end
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