class Fluent::Plugin::RecordTransformerFilter
Public Instance Methods
configure(conf)
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Calls superclass method
Fluent::PluginLoggerMixin#configure
# File lib/fluent/plugin/filter_record_transformer.rb, line 45 def configure(conf) super map = {} # <record></record> directive conf.elements.select { |element| element.name == 'record' }.each do |element| element.each_pair do |k, v| element.has_key?(k) # to suppress unread configuration warning map[k] = parse_value(v) end end if @keep_keys raise Fluent::ConfigError, "`renew_record` must be true to use `keep_keys`" unless @renew_record end @key_deleters = if @remove_keys @remove_keys.map { |k| record_accessor_create(k) } end placeholder_expander_params = { log: log, auto_typecast: @auto_typecast, } @placeholder_expander = if @enable_ruby # require utilities which would be used in ruby placeholders require 'pathname' require 'uri' require 'cgi' RubyPlaceholderExpander.new(placeholder_expander_params) else PlaceholderExpander.new(placeholder_expander_params) end @map = @placeholder_expander.preprocess_map(map) @hostname = Socket.gethostname end
filter_stream(tag, es)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 84 def filter_stream(tag, es) new_es = Fluent::MultiEventStream.new tag_parts = tag.split('.') tag_prefix = tag_prefix(tag_parts) tag_suffix = tag_suffix(tag_parts) placeholder_values = { 'tag' => tag, 'tag_parts' => tag_parts, 'tag_prefix' => tag_prefix, 'tag_suffix' => tag_suffix, 'hostname' => @hostname, } es.each do |time, record| begin placeholder_values['time'] = @placeholder_expander.time_value(time) placeholder_values['record'] = record new_record = reform(record, placeholder_values) if @renew_time_key && new_record.has_key?(@renew_time_key) time = Fluent::EventTime.from_time(Time.at(new_record[@renew_time_key].to_f)) end @key_deleters.each { |deleter| deleter.delete(new_record) } if @key_deleters new_es.add(time, new_record) rescue => e router.emit_error_event(tag, time, record, e) log.debug { "map:#{@map} record:#{record} placeholder_values:#{placeholder_values}" } end end new_es end
Private Instance Methods
expand_placeholders(value, placeholders)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 140 def expand_placeholders(value, placeholders) if value.is_a?(String) new_value = @placeholder_expander.expand(value, placeholders) elsif value.is_a?(Hash) new_value = {} value.each_pair do |k, v| new_key = @placeholder_expander.expand(k, placeholders, true) new_value[new_key] = expand_placeholders(v, placeholders) end elsif value.is_a?(Array) new_value = [] value.each_with_index do |v, i| new_value[i] = expand_placeholders(v, placeholders) end else new_value = value end new_value end
parse_value(value_str)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 117 def parse_value(value_str) if value_str.start_with?('{', '[') JSON.parse(value_str) else value_str end rescue => e log.warn "failed to parse #{value_str} as json. Assuming #{value_str} is a string", error: e value_str # emit as string end
reform(record, placeholder_values)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 128 def reform(record, placeholder_values) placeholders = @placeholder_expander.prepare_placeholders(placeholder_values) new_record = @renew_record ? {} : record.dup @keep_keys.each do |k| new_record[k] = record[k] if record.has_key?(k) end if @keep_keys && @renew_record new_record.merge!(expand_placeholders(@map, placeholders)) new_record end
tag_prefix(tag_parts)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 160 def tag_prefix(tag_parts) return [] if tag_parts.empty? tag_prefix = [tag_parts.first] 1.upto(tag_parts.size-1).each do |i| tag_prefix[i] = "#{tag_prefix[i-1]}.#{tag_parts[i]}" end tag_prefix end
tag_suffix(tag_parts)
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# File lib/fluent/plugin/filter_record_transformer.rb, line 169 def tag_suffix(tag_parts) return [] if tag_parts.empty? rev_tag_parts = tag_parts.reverse rev_tag_suffix = [rev_tag_parts.first] 1.upto(tag_parts.size-1).each do |i| rev_tag_suffix[i] = "#{rev_tag_parts[i]}.#{rev_tag_suffix[i-1]}" end rev_tag_suffix.reverse! end