Module: Puppet::Interface::FaceCollection

Defined in:
lib/vendor/puppet/interface/face_collection.rb

Class Method Summary collapse

Class Method Details

.[](name, version) ⇒ Object 



18
19
20
21
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 18

def self.[](name, version)
  name = underscorize(name)
  get_face(name, version) or load_face(name, version)
end

.faces ⇒ Object 



6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 6

def self.faces
  unless @loaded
    @loaded = true
    $LOAD_PATH.each do |dir|
      Dir.glob("#{dir}/puppet/face/*.rb").
        collect {|f| File.basename(f, '.rb') }.
        each {|name| self[name, :current] }
    end
  end
  @faces.keys.select {|name| @faces[name].length > 0 }
end

.get_action_for_face(name, action_name, version) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 23

def self.get_action_for_face(name, action_name, version)
  name = underscorize(name)

  # If the version they request specifically doesn't exist, don't search
  # elsewhere.  Usually this will start from :current and all...
  return nil unless face = self[name, version]
  unless action = face.get_action(action_name)
    # ...we need to search for it bound to an o{lder,ther} version.  Since
    # we load all actions when the face is first references, this will be in
    # memory in the known set of versions of the face.
    (@faces[name].keys - [ :current ]).sort.reverse.each do |version|
      break if action = @faces[name][version].get_action(action_name)
    end
  end

  return action
end

.get_face(name, pattern) ⇒ Object

get face from memory, without loading.



42
43
44
45
46
47
48
49
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 42

def self.get_face(name, pattern)
  return nil unless @faces.has_key? name
  return @faces[name][:current] if pattern == :current

  versions = @faces[name].keys - [ :current ]
  found    = SemVer.find_matching(pattern, versions)
  return @faces[name][found]
end

.load_face(name, version) ⇒ Object

try to load the face, and return it.



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 52

def self.load_face(name, version)
  # We always load the current version file; the common case is that we have
  # the expected version and any compatibility versions in the same file,
  # the default.  Which means that this is almost always the case.
  #
  # We use require to avoid executing the code multiple times, like any
  # other Ruby library that we might want to use.  --daniel 2011-04-06
  if safely_require name then
    # If we wanted :current, we need to index to find that; direct version
    # requests just work™ as they go. --daniel 2011-04-06
    if version == :current then
      # We need to find current out of this.  This is the largest version
      # number that doesn't have a dedicated on-disk file present; those
      # represent "experimental" versions of faces, which we don't fully
      # support yet.
      #
      # We walk the versions from highest to lowest and take the first version
      # that is not defined in an explicitly versioned file on disk as the
      # current version.
      #
      # This constrains us to only ship experimental versions with *one*
      # version in the file, not multiple, but given you can't reliably load
      # them except by side-effect when you ignore that rule this seems safe
      # enough...
      #
      # Given those constraints, and that we are not going to ship a versioned
      # interface that is not :current in this release, we are going to leave
      # these thoughts in place, and just punt on the actual versioning.
      #
      # When we upgrade the core to support multiple versions we can solve the
      # problems then; as lazy as possible.
      #
      # We do support multiple versions in the same file, though, so we sort
      # versions here and return the last item in that set.
      #
      # --daniel 2011-04-06
      latest_ver = @faces[name].keys.sort.last
      @faces[name][:current] = @faces[name][latest_ver]
    end
  end

  unless version == :current or get_face(name, version)
    # Try an obsolete version of the face, if needed, to see if that helps?
    safely_require name, version
  end

  return get_face(name, version)
end

.register(face) ⇒ Object 



117
118
119
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 117

def self.register(face)
  @faces[underscorize(face.name)][face.version] = face
end

.safely_require(name, version = nil) ⇒ Object 



101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 101

def self.safely_require(name, version = nil)
  path = File.join 'puppet' ,'face', version.to_s, name.to_s
  require path
  true

rescue LoadError => e
  raise unless e.message =~ %r{-- #{path}$}
  # ...guess we didn't find the file; return a much better problem.
  nil
rescue SyntaxError => e
  raise unless e.message =~ %r{#{path}\.rb:\d+: }
  Puppet.err "Failed to load face #{name}:\n#{e}"
  # ...but we just carry on after complaining.
  nil
end

.underscorize(name) ⇒ Object 



121
122
123
124
125
126
127
 
# File 'lib/vendor/puppet/interface/face_collection.rb', line 121

def self.underscorize(name)
  unless name.to_s =~ /^[-_a-z]+$/i then
    raise ArgumentError, "#{name.inspect} (#{name.class}) is not a valid face name"
  end

  name.to_s.downcase.split(/[-_]/).join('_').to_sym
end