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 



202
203
204
205
206
207
208
209
210
211
212
 
# File 'lib/appmap/util.rb', line 202

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

.class_from_string(fq_class, must: true) ⇒ Object 



24
25
26
27
28
29
30
 
# File 'lib/appmap/util.rb', line 24

def class_from_string(fq_class, must: true)
  fq_class.split('::').inject(Object) do |mod, class_name|
    mod.const_get(class_name)
  end
rescue NameError
  raise if must
end

.classify(word) ⇒ Object 



181
182
183
 
# File 'lib/appmap/util.rb', line 181

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

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



175
176
177
178
179
 
# File 'lib/appmap/util.rb', line 175

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 



197
198
199
200
 
# File 'lib/appmap/util.rb', line 197

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 



142
143
144
145
146
147
148
 
# File 'lib/appmap/util.rb', line 142

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 



32
33
34
35
36
37
38
39
40
 
# File 'lib/appmap/util.rb', line 32

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 



231
232
233
 
# File 'lib/appmap/util.rb', line 231

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.



94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
 
# File 'lib/appmap/util.rb', line 94

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.



78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/appmap/util.rb', line 78

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.



45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/appmap/util.rb', line 45

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 



119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
 
# File 'lib/appmap/util.rb', line 119

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 



223
224
225
226
227
228
229
 
# File 'lib/appmap/util.rb', line 223

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



152
153
154
155
156
157
158
 
# File 'lib/appmap/util.rb', line 152

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



215
216
217
218
219
220
221
 
# File 'lib/appmap/util.rb', line 215

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



186
187
188
189
190
191
192
193
194
195
 
# File 'lib/appmap/util.rb', line 186

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.



161
162
163
164
165
166
167
168
169
170
171
172
173
 
# File 'lib/appmap/util.rb', line 161

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