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# File 'lib/safe_monkeypatch.rb', line 18
def safe_monkeypatch(meth, options={})
options = options.dup
info = options.delete(:error)
if meth.is_a? UnboundMethod
method = meth
meth = method.name
else
begin
method = instance_method(meth)
rescue NameError => e
raise SafeMonkeypatch::InvalidMethod, "#{inspect} has no method #{meth} anymore"
end
end
source = method.source
if options.empty?
raise SafeMonkeypatch::ConfigurationError, "Provide at least one cypher name like: md5: '...'"
end
options.each do |cypher_name, expected|
cypher = Digest.const_get(cypher_name.upcase)
if (actual = cypher.hexdigest(source)) != expected
raise SafeMonkeypatch::UpstreamChanged, "#{inspect}##{meth} expected to have #{cypher_name} expected: '#{expected}', but has: '#{actual}'\n#{info}".strip
end
end
end
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