Class: U3d::LogAnalyzer

Inherits:
Object
  • Object
show all
Defined in:
lib/u3d/log_analyzer.rb

Overview

Analyzes log by filtering output along a set of rules rubocop:disable Metrics/ClassLength, Metrics/PerceivedComplexity, Metrics/BlockNesting

Constant Summary collapse

RULES_PATH = 
File.expand_path('../../config/log_rules.json', __dir__)
MEMORY_SIZE = 
10

Instance Method Summary collapse

Constructor Details

#initialize ⇒ LogAnalyzer

Returns a new instance of LogAnalyzer.



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# File 'lib/u3d/log_analyzer.rb', line 35

def initialize
  @lines_memory = Array.new(MEMORY_SIZE)
  @active_phase = nil
  @active_rule = nil
  @context = {}
  @rule_lines_buffer = []
  @generic_rules, @phases = load_rules
end

Instance Method Details

#load_rules ⇒ Object 



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# File 'lib/u3d/log_analyzer.rb', line 44

def load_rules
  generic_rules = {}
  phases = {}

  data = JSON.parse(File.read(rules_path))

  if data['GENERAL'] && data['GENERAL']['active']
    data['GENERAL']['rules'].each do |rn, r|
      generic_rules[rn] = r if parse_rule(r)
    end
  end
  data.delete('GENERAL')
  data.each do |name, phase|
    # Phase parsing
    next unless phase['active']
    next if phase['phase_start_pattern'].nil?

    phase['phase_start_pattern'] = Regexp.new phase['phase_start_pattern']
    phase['phase_end_pattern'] = Regexp.new phase['phase_end_pattern'] if phase['phase_end_pattern']
    phase.delete('comment')
    # Rules parsing
    temp_rules = {}
    unless phase['silent'] == true
      phase['rules'].each do |rn, r|
        temp_rules[rn] = r if parse_rule(r)
      end
    end
    phase['rules'] = temp_rules
    phases[name] = phase
  end
  return generic_rules, phases
end

#parse_line(line) ⇒ Object 



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# File 'lib/u3d/log_analyzer.rb', line 77

def parse_line(line)
  # Insert new line and remove last stored line
  @lines_memory.push(line).shift

  # Check if phase is changing
  @phases.each do |name, phase|
    next if name == @active_phase
    next unless line =~ phase['phase_start_pattern']

    finish_phase if @active_phase
    @active_phase = name
    UI.verbose("--- Beginning #{name} phase ---")
    break
  end

  apply_ruleset = lambda do |ruleset, header|
    # Apply the active rule
    if @active_rule && ruleset[@active_rule]
      rule = ruleset[@active_rule]
      pattern = rule['end_pattern']

      # Is it the end of the rule?
      if line =~ pattern
        unless @rule_lines_buffer.empty?
          @rule_lines_buffer.each do |l|
            UI.send(rule['type'], "[#{header}] " + l)
          end
        end
        if rule['end_message'] != false
          if rule['end_message']
            match = line.match(pattern)
            params = match.names.map(&:to_sym).zip(match.captures).to_h
            message = inject(rule['end_message'], params: params)
          else
            message = line.chomp
          end
          message = "[#{header}] " + message
          UI.send(rule['type'], message)
        end
        @active_rule = nil
        @context.clear
        @rule_lines_buffer.clear

      # It's not the end of the rules, should the line be stored?
      elsif rule['store_lines']
        match = false
        rule['ignore_lines']&.each do |pat|
          if line =~ pat
            match = true
            break
          end
        end
        @rule_lines_buffer << line.chomp unless match
      end
    end

    # If there is no active rule, try to apply a new one
    if @active_rule.nil?
      ruleset.each do |rn, r|
        pattern = r['start_pattern']
        next unless line =~ pattern

        @active_rule = rn if r['end_pattern']
        match = line.match(pattern)
        @context = match.names.map(&:to_sym).zip(match.captures).to_h
        if r['fetch_line_at_index'] || r['fetch_first_line_not_matching']
          if r['fetch_line_at_index']
            fetched_line = @lines_memory.reverse[r['fetch_line_at_index']]
          else
            fetched_line = nil
            @lines_memory.reverse.each do |l|
              match = false
              r['fetch_first_line_not_matching'].each do |pat|
                next unless l =~ pat

                match = true
                break
              end
              next if match

              fetched_line = l
              break
            end
          end
          if fetched_line
            if r['fetched_line_pattern']
              match = fetched_line.match(r['fetched_line_pattern'])
              @context.merge!(match.names.map(&:to_sym).zip(match.captures).to_h)
            end
            if r['fetched_line_message'] != false
              message = if r['fetched_line_message']
                          inject(r['fetched_line_message'])
                        else
                          fetched_line.chomp
                        end
              message = "[#{header}] " + message
              UI.send(r['type'], message)
            end
          end
        end
        if r['start_message'] != false
          message = if r['start_message']
                      inject(r['start_message'])
                    else
                      line.chomp
                    end
          message = "[#{header}] " + message
          UI.send(r['type'], message)
        end
        break
      end
    end
  end

  if @active_phase
    apply_ruleset.call(@phases[@active_phase]['rules'], @active_phase)
    finish_phase if @phases[@active_phase]['phase_end_pattern'] && @phases[@active_phase]['phase_end_pattern'] =~ line
  end
  apply_ruleset.call(@generic_rules, 'GENERAL')
end