Class: Neolytics::Recorder

Inherits:
Object
  • Object
show all
Defined in:
lib/neolytics/recorder.rb

Instance Method Summary collapse

Constructor Details

#initialize(neo4j_session) ⇒ Recorder

Returns a new instance of Recorder.



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# File 'lib/neolytics/recorder.rb', line 8

def initialize(neo4j_session)
  @neo4j_session = neo4j_session
  @neo4apis_session = Neo4Apis::Neolytics.new(neo4j_session)
end

Instance Method Details

#record(&block) ⇒ Object 



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# File 'lib/neolytics/recorder.rb', line 13

def record(&block)
  @neo4apis_session.batch do
    record_execution_trace do
      begin
        block.call
      rescue Exception => e
        nil
      end
    end

    file_paths = @neo4j_session.query("MATCH (tp) WHERE NOT(tp.path IS NULL) RETURN DISTINCT tp.path AS path").map(&:path)
    file_paths.each(&method(:record_ast))

    link_query = <<QUERY
MATCH (tp:TracePoint), (node:ASTNode)
WHERE
  node.file_path = tp.path AND
  node.first_line = tp.lineno AND
  node.name = tp.method_id AND
  node.type = 'def'
MERGE (tp)-[:HAS_AST_NODE]->(node)
QUERY
    @neo4j_session.query(link_query)
  end
end

#record_ast(file_path) ⇒ Object 



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# File 'lib/neolytics/recorder.rb', line 40

def record_ast(file_path)
  full_path = Pathname.new(file_path).realpath.to_s

  code = File.read(full_path)

  require 'parser/current'
  root = Parser::CurrentRuby.parse(code)

  file_node = @neo4apis_session.import :File, full_path, code
  node_node = @neo4apis_session.import :ASTNode, root, file_node
end

#record_execution_trace ⇒ Object 



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# File 'lib/neolytics/recorder.rb', line 53

def record_execution_trace
  execution_index = 0
  indent = 0
  output = ''
  last_tracepoint_node = nil
  last_start_time = nil
  ancestor_stack = []
  run_time_stack = []

  last_tracepoint_end_time = nil
  last_run_time = nil

  trace = TracePoint.new do |tp|
    begin
      last_run_time = 1_000_000.0 * (Time.now - last_tracepoint_end_time) if last_tracepoint_end_time

      output << tracepoint_string(tp, indent)

      last_method_time = nil
      if [:call, :c_call].include?(tp.event)
        run_time_stack.push(0)
      elsif [:return, :c_return].include?(tp.event)
        last_method_time = run_time_stack.pop
      else
        run_time_stack[-1] += last_run_time if run_time_stack[-1] && last_run_time
      end

      associated_call = nil
      if [:return, :c_return].include?(tp.event) && indent.nonzero?
        indent -= 1
        associated_call = ancestor_stack.pop
      elsif [:call, :c_call].include?(tp.event)
        indent += 1
      end

      last_tracepoint_node = @neo4apis_session.import :TracePoint, tp,
                          last_method_time,
                          (execution_index += 1),
                          last_tracepoint_node,
                          ancestor_stack.last,
                          associated_call
      
      if [:call, :c_call].include?(tp.event)
        ancestor_stack.push(last_tracepoint_node)
      end

      last_tracepoint_end_time = Time.now
    rescue Exception => e
      puts 'EXCEPTION!!'
      puts e.message
      puts e.backtrace
      exit!
    end
  end

  trace.enable
  yield
ensure
  trace.disable
  puts output
end