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Contents
module Pliny
# Helpers to produce a canonical log line. This mostly amounts to a set of
# accessors that do basic type checking combined with tracking an internal
# schema so that we can produce a hash of everything that's been set so far.
module CanonicalLogLineHelpers
module ClassMethods
def log_field(name, type)
unless name.is_a?(Symbol)
raise ArgumentError, "Expected first argument to be a symbol"
end
@fields ||= {}
@fields[name] = type
define_method(:"#{name}=") do |val|
set_field(name, val)
end
end
end
def self.included(klass)
klass.extend(ClassMethods)
end
def to_h
@values
end
private
def set_field(name, value)
type = self.class.instance_variable_get(:@fields)[name]
unless type
raise ArgumentError, "Field #{name} undefined"
end
if !value.nil? && !value.is_a?(type)
raise ArgumentError,
"Expected #{name} to be type #{type} (was #{value.class.name})"
end
@values ||= {}
@values[name] = value
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems