Module: AppMap::Util

Defined in:
lib/appmap/util.rb

Constant Summary collapse

CLEAR =

https://wynnnetherland.com/journal/a-stylesheet-author-s-guide-to-terminal-colors/ Embed in a String to clear all previous ANSI sequences.

"\e[0m"
BOLD = 
"\e[1m"
BLACK =

Colors

"\e[30m"
RED = 
"\e[31m"
GREEN = 
"\e[32m"
YELLOW = 
"\e[33m"
BLUE = 
"\e[34m"
MAGENTA = 
"\e[35m"
CYAN = 
"\e[36m"
WHITE = 
"\e[37m"

Class Method Summary collapse

Class Method Details

.blank?(obj) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/appmap/util.rb', line 194

def blank?(obj)
  return true if obj.nil?
  
  return true if obj.is_a?(String) && obj == ''

  return true if obj.respond_to?(:length) && obj.length == 0

  return true if obj.respond_to?(:size) && obj.size == 0

  false
end

.classify(word) ⇒ Object 



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# File 'lib/appmap/util.rb', line 173

def classify(word)
  word.split(/[\-_]/).map(&:capitalize).join
end

.color(text, color, bold: false) ⇒ Object 



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# File 'lib/appmap/util.rb', line 167

def color(text, color, bold: false)
  color = Util.const_get(color.to_s.upcase) if color.is_a?(Symbol)
  bold  = bold ? BOLD : ""
  "#{bold}#{color}#{text}#{CLEAR}"
end

.deep_dup(hash) ⇒ Object 



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# File 'lib/appmap/util.rb', line 189

def deep_dup(hash)
  # This is a simple way to avoid the need for deep_dup from activesupport.
  Marshal.load(Marshal.dump(hash))
end

.normalize_path(path) ⇒ Object 



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# File 'lib/appmap/util.rb', line 134

def normalize_path(path)
  if path.index(Dir.pwd) == 0 && !path.index(Bundler.bundle_path.to_s)
    path[Dir.pwd.length + 1..-1]
  else
    path
  end
end

.parse_function_name(name) ⇒ Object 



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# File 'lib/appmap/util.rb', line 24

def parse_function_name(name)
  package_tokens = name.split('/')

  class_and_name = package_tokens.pop
  class_name, function_name, static = class_and_name.include?('.') ? class_and_name.split('.', 2) + [ true ] : class_and_name.split('#', 2) + [ false ]

  raise "Malformed fully-qualified function name #{name}" unless function_name
  [ package_tokens.empty? ? 'ruby' : package_tokens.join('/'), class_name, static, function_name ]
end

.ruby_minor_version ⇒ Object 



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# File 'lib/appmap/util.rb', line 223

def ruby_minor_version
  @ruby_minor_version ||= RUBY_VERSION.split('.')[0..1].join('.').to_f
end

.sanitize_event(event, &block) ⇒ Object

sanitize_event removes ephemeral values from an event, making events easier to compare across runs.



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# File 'lib/appmap/util.rb', line 86

def sanitize_event(event, &block)
  event.delete(:thread_id)
  event.delete(:elapsed)
  delete_object_id = ->(obj) { (obj || {}).delete(:object_id) }
  delete_object_id.call(event[:receiver])
  delete_object_id.call(event[:return_value])
  %i[parameters exceptions message].each do |field|
    (event[field] || []).each(&delete_object_id)
  end
  %i[http_client_request http_client_response http_server_request http_server_response].each do |field|
    headers = event.dig(field, :headers)
    next unless headers

    headers['Date'] = '<instanceof date>' if headers['Date']
    headers['Server'] = headers['Server'].match(/^(\w+)/)[0] if headers['Server']
  end

  case event[:event]
  when :call
    sanitize_paths(event)
  end

  event
end

.sanitize_paths(h) ⇒ Object

sanitize_paths removes ephemeral values from objects with embedded paths (e.g. an event or a classmap), making events easier to compare across runs.



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# File 'lib/appmap/util.rb', line 70

def sanitize_paths(h)
  require 'hashie'
  h.extend(Hashie::Extensions::DeepLocate)
  keys = %i(path location)
  h.deep_locate ->(k,v,o) {
    next unless keys.include?(k)
    
    fix = ->(v) {v.gsub(%r{#{Gem.dir}/gems/.*(?=lib)}, '')}
    keys.each {|k| o[k] = fix.(o[k]) if o[k] }
  }

  h
end

.scenario_filename(name, max_length: 255, separator: '_', extension: '.appmap.json') ⇒ Object

scenario_filename builds a suitable file name from a scenario name. Special characters are removed, and the file name is truncated to fit within shell limitations.



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# File 'lib/appmap/util.rb', line 37

def scenario_filename(name, max_length: 255, separator: '_', extension: '.appmap.json')
  # Cribbed from v5 version of ActiveSupport:Inflector#parameterize:
  # https://github.com/rails/rails/blob/v5.2.4/activesupport/lib/active_support/inflector/transliterate.rb#L92
  # Replace accented chars with their ASCII equivalents.

  fname = name.encode('utf-8', invalid: :replace, undef: :replace, replace: '_')

  # Turn unwanted chars into the separator.
  fname.gsub!(/[^a-z0-9\-_]+/i, separator)

  re_sep = Regexp.escape(separator)
  re_duplicate_separator        = /#{re_sep}{2,}/
  re_leading_trailing_separator = /^#{re_sep}|#{re_sep}$/i

  # No more than one of the separator in a row.
  fname.gsub!(re_duplicate_separator, separator)

  # Finally, Remove leading/trailing separator.
  fname.gsub!(re_leading_trailing_separator, '')

  if (fname.length + extension.length) > max_length
    require 'base64'
    require 'digest'
    fname_digest = Base64.urlsafe_encode64 Digest::MD5.digest(fname), padding: false
    fname[max_length - fname_digest.length - extension.length - 1..-1] = [ '-', fname_digest ].join
  end

  [ fname, extension ].join
end

.select_rack_headers(env) ⇒ Object 



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# File 'lib/appmap/util.rb', line 111

def select_rack_headers(env)
  finalize_headers = lambda do |headers|
    blank?(headers) ? nil : headers
  end

  # Rack prepends HTTP_ to all client-sent headers.

  if !env['rack.version']
    warn "Request headers does not contain rack.version. HTTP_ prefix is not expected."
    return finalize_headers.call(env.dup)
  end

  matching_headers = env
    .select { |k,v| k.start_with? 'HTTP_'}
    .reject { |k,v| blank?(v) }
    .each_with_object({}) do |kv, memo|
      key = kv[0].sub(/^HTTP_/, '').split('_').map(&:capitalize).join('-')
      value = kv[1]
      memo[key] = value
    end
  finalize_headers.call(matching_headers)
end

.startup_message(msg) ⇒ Object 



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# File 'lib/appmap/util.rb', line 215

def startup_message(msg)
  if defined?(::Rails) && defined?(::Rails.logger) && ::Rails.logger
    ::Rails.logger.info msg
  elsif ENV['DEBUG'] == 'true'
    warn msg
  end
end

.swaggerize_path(path) ⇒ Object

Convert a Rails-style path from /org/:org_id(.:format) to Swagger-style paths like /org/org_id



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# File 'lib/appmap/util.rb', line 144

def swaggerize_path(path)
  path = path.split('(.')[0]
  tokens = path.split('/')
  tokens.map do |token|
    token.gsub(/^:(.*)/, '{\1}')
  end.join('/')
end

.try(obj, *methods) ⇒ Object

https://github.com/rails/rails/blob/8cd143900978902ed9bbba10b34099a3140de5c6/activesupport/lib/active_support/core_ext/object/try.rb



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# File 'lib/appmap/util.rb', line 207

def try(obj, *methods)
  return nil if methods.empty?

  return nil unless obj.respond_to?(methods.first)

  obj.public_send(*methods)
end

.underscore(camel_cased_word) ⇒ Object

https://api.rubyonrails.org/v6.1.3.2/classes/ActiveSupport/Inflector.html#method-i-underscore



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# File 'lib/appmap/util.rb', line 178

def underscore(camel_cased_word)
  return camel_cased_word unless /[A-Z-]|::/.match?(camel_cased_word)
  word = camel_cased_word.to_s.gsub("::", "/")
  # word.gsub!(inflections.acronyms_underscore_regex) { "#{$1 && '_' }#{$2.downcase}" }
  word.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2')
  word.gsub!(/([a-z\d])([A-Z])/, '\1_\2')
  word.tr!("-", "_")
  word.downcase!
  word
end

.write_appmap(filename, appmap) ⇒ Object

Atomically writes AppMap data to filename.



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# File 'lib/appmap/util.rb', line 153

def write_appmap(filename, appmap)
  require 'tmpdir'

  # This is what Ruby Tempfile does; but we don't want the file to be unlinked.
  mode = File::RDWR | File::CREAT | File::EXCL
  ::Dir::Tmpname.create([ 'appmap_', '.json' ]) do |tmpname|
    tempfile = File.open(tmpname, mode)
    tempfile.write(appmap)
    tempfile.close
    # Atomically move the tempfile into place.
    FileUtils.mv tempfile.path, filename
  end
end