Class: SelectRailsLog::Scanner

Inherits:
Object
  • Object
show all
Includes:
Constants
Defined in:
lib/select_rails_log/scanner.rb

Constant Summary collapse

LOG_REGEXP = 
/\A., \[(?<time>\S+) #(?<pid>\d+)\]  *(?<severity>\S+) -- :(?: #{reqid_regexp})? (?<message>.*)/
ANSI_ESCAPE_SEQ_REGEXP = 
/\e\[(?:\d{1,2}(?:;\d{1,2})?)?[mK]/

Constants included from Constants

Constants::ACTION, Constants::CLIENT, Constants::COMPLETED, Constants::CONTROLLER, Constants::DEBUG, Constants::DEFAULT_OUTPUT, Constants::DURATION, Constants::HTTP_METHOD, Constants::HTTP_STATUS, Constants::ID, Constants::INTERVAL, Constants::LOGS, Constants::MESSAGE, Constants::PARAMETERS, Constants::PATH, Constants::PERFORMANCE, Constants::PERFORMANCE_ACTIVE_RECORD, Constants::PERFORMANCE_ALLOCATIONS, Constants::PERFORMANCE_VIEWS, Constants::PID, Constants::RAW_LOGS, Constants::REQUEST_ID, Constants::SEVERITY, Constants::STARTED, Constants::TIME

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/select_rails_log/scanner.rb', line 17

def initialize(io)
  @io = io
end

Instance Method Details

#select(selector, keep_raw: true) ⇒ Object 



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# File 'lib/select_rails_log/scanner.rb', line 21

def select(selector, keep_raw: true)
  buff = {}
  prev_time = nil
  prev_data = nil
  found = false
  stop_iteration = false

  @io.each_line do |line|
    m = LOG_REGEXP.match(line)
    unless m
      if prev_data && prev_data[LOGS].any?
        prev_data[LOGS].last[MESSAGE] << "\n" << line.chomp.gsub(ANSI_ESCAPE_SEQ_REGEXP, "")
        prev_data[RAW_LOGS].last << line if keep_raw
      end
      next
    end

    begin
      time = Time.strptime(m[:time], DATETIME_FORMAT)
    rescue ArgumentError
      # ignore invalid time format
    end

    pid = m[:pid]
    reqid = m[:reqid]
    message = m[:message]
    log = {
      TIME => time,
      MESSAGE => message,
      SEVERITY => m[:severity]
    }

    ident = reqid || pid
    data = prev_data = buff[ident] if buff.key?(ident)

    if /\A(?:\[.*\] )?Started (?<http_method>\S+) "(?<path>[^"]*)" for (?<client>\S+)/ =~ message
      buff.delete(ident)
      if stop_iteration
        prev_data = nil
        buff.empty? ? break : next
      end

      log[INTERVAL] = 0.0
      prev_time = time

      data = {
        ID => reqid || time.strftime("%Y%m%d-%H%M%S-%6N-#{pid}"),
        STARTED => time,
        PID => pid,
        REQUEST_ID => reqid,
        HTTP_METHOD => http_method,
        PATH => path,
        CLIENT => client,
        LOGS => [log],
        REQUEST_FILTER_APPLIED => false
      }
      data[RAW_LOGS] = [line] if keep_raw
      buff[ident] = data
      next
    end

    unless data
      prev_data = nil
      next
    end

    message.gsub!(ANSI_ESCAPE_SEQ_REGEXP, "")
    log[INTERVAL] = (time && prev_time) ? time - prev_time : 0.0
    prev_time = time

    if /\A(?:\[.*\] )?Processing by (?<controller>[^\s#]+)#(?<action>\S+)/ =~ message
      data[CONTROLLER] = controller
      data[ACTION] = action
      data[LOGS] << log
      data[RAW_LOGS] << line if keep_raw

      data.delete(REQUEST_FILTER_APPLIED)
      begin
        reqf_result = selector.run_request_filters(data)
      rescue StopIteration
        stop_iteration = true
      end
      if !reqf_result || stop_iteration
        buff.delete(ident)
        prev_data = nil
      end
    elsif /\A(?:\[.*\] )?  Parameters: (?<params>.*)/ =~ message
      data[PARAMETERS] = params
      data[LOGS] << log
      data[RAW_LOGS] << line if keep_raw
    elsif /\A(?:\[.*\] )?Completed (?<http_status>\d+) .* in (?<duration>\d+)ms \((?<durations>.*)\)/ =~ message
      data[HTTP_STATUS] = http_status
      data[DURATION] = duration.to_i
      data[PERFORMANCE] = durations.scan(/(\S+): (\d+(\.\d+)?)/)
                                   .to_h { |type, dur, dur_f| [type, dur_f ? dur.to_f : dur.to_i] }
      data[COMPLETED] = time
      data[LOGS] << log
      data[RAW_LOGS] << line if keep_raw

      if data.key?(REQUEST_FILTER_APPLIED)
        data.delete(REQUEST_FILTER_APPLIED)
        reqf_result = selector.run_request_filters(data)
      else
        reqf_result = true
      end

      reqf_result && selector.run_line_filters(data) do |i|
        yield(i)
        found = true
      end
      buff.delete(ident)
      prev_data = nil
    else
      data[LOGS] << log
      data[RAW_LOGS] << line if keep_raw
    end
  end

  found
end