Class: Gem::SpecFetcher

Inherits:
Object
  • Object
show all
Includes:
Text, UserInteraction
Defined in:
lib/rubygems/spec_fetcher.rb

Overview

SpecFetcher handles metadata updates from remote gem repositories.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Text

#format_text, #levenshtein_distance

Methods included from UserInteraction

#alert, #alert_error, #alert_warning, #ask, #ask_for_password, #ask_yes_no, #choose_from_list, #say, #terminate_interaction

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Constructor Details

#initialize(sources = nil) ⇒ SpecFetcher

Creates a new SpecFetcher. Ordinarily you want to use the default fetcher from Gem::SpecFetcher::fetcher which uses the Gem.sources.

If you need to retrieve specifications from a different source, you can send it as an argument.



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/rubygems/spec_fetcher.rb', line 56

def initialize sources = nil
  @sources = sources || Gem.sources

  @update_cache =
    begin
      File.stat(Gem.user_home).uid == Process.uid
    rescue Errno::EACCES, Errno::ENOENT
      false
    end

  @specs = {}
  @latest_specs = {}
  @prerelease_specs = {}

  @caches = {
    :latest => @latest_specs,
    :prerelease => @prerelease_specs,
    :released => @specs,
  }

  @fetcher = Gem::RemoteFetcher.fetcher
end

Instance Attribute Details

#latest_specs ⇒ Object (readonly)

Cache of latest specs



18
19
20
 
# File 'lib/rubygems/spec_fetcher.rb', line 18

def latest_specs
  @latest_specs
end

#prerelease_specs ⇒ Object (readonly)

Cache of prerelease specs



33
34
35
 
# File 'lib/rubygems/spec_fetcher.rb', line 33

def prerelease_specs
  @prerelease_specs
end

#sources ⇒ Object (readonly)

Sources for this SpecFetcher



23
24
25
 
# File 'lib/rubygems/spec_fetcher.rb', line 23

def sources
  @sources
end

#specs ⇒ Object (readonly)

Cache of all released specs



28
29
30
 
# File 'lib/rubygems/spec_fetcher.rb', line 28

def specs
  @specs
end

Class Method Details

.fetcher ⇒ Object

Default fetcher instance. Use this instead of ::new to reduce object allocation.



41
42
43
 
# File 'lib/rubygems/spec_fetcher.rb', line 41

def self.fetcher
  @fetcher ||= new
end

.fetcher=(fetcher) ⇒ Object

:nodoc:



45
46
47
 
# File 'lib/rubygems/spec_fetcher.rb', line 45

def self.fetcher=(fetcher) # :nodoc:
  @fetcher = fetcher
end

Instance Method Details

#available_specs(type) ⇒ Object

Returns a list of gems available for each source in Gem::sources.

type can be one of 3 values: :released => Return the list of all released specs :complete => Return the list of all specs :latest => Return the list of only the highest version of each gem :prerelease => Return the list of all prerelease only specs



218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
 
# File 'lib/rubygems/spec_fetcher.rb', line 218

def available_specs(type)
  errors = []
  list = {}

  @sources.each_source do |source|
    begin
      names = case type
              when :latest
                tuples_for source, :latest
              when :released
                tuples_for source, :released
              when :complete
                names =
                  tuples_for(source, :prerelease, true) +
                  tuples_for(source, :released)

                names.sort
              when :abs_latest
                names =
                  tuples_for(source, :prerelease, true) +
                  tuples_for(source, :latest)

                names.sort
              when :prerelease
                tuples_for(source, :prerelease)
              else
                raise Gem::Exception, "Unknown type - :#{type}"
              end
    rescue Gem::RemoteFetcher::FetchError => e
      errors << Gem::SourceFetchProblem.new(source, e)
    else
      list[source] = names
    end
  end

  [list, errors]
end

#detect(type = :complete) ⇒ Object

Return all gem name tuples who’s names match obj



144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'lib/rubygems/spec_fetcher.rb', line 144

def detect(type=:complete)
  tuples = []

  list, _ = available_specs(type)
  list.each do |source, specs|
    specs.each do |tup|
      if yield(tup)
        tuples << [tup, source]
      end
    end
  end

  tuples
end

#search_for_dependency(dependency, matching_platform = true) ⇒ Object

Find and fetch gem name tuples that match dependency.

If matching_platform is false, gems for all platforms are returned.



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/rubygems/spec_fetcher.rb', line 85

def search_for_dependency(dependency, matching_platform=true)
  found = {}

  rejected_specs = {}

  if dependency.prerelease?
    if dependency.specific?
      type = :complete
    else
      type = :abs_latest
    end
  elsif dependency.latest_version?
    type = :latest
  else
    type = :released
  end

  list, errors = available_specs(type)
  list.each do |source, specs|
    if dependency.name.is_a?(String) && specs.respond_to?(:bsearch)
      start_index = (0 ... specs.length).bsearch{ |i| specs[i].name >= dependency.name }
      end_index   = (0 ... specs.length).bsearch{ |i| specs[i].name > dependency.name }
      specs = specs[start_index ... end_index] if start_index && end_index
    end

    found[source] = specs.select do |tup|
      if dependency.match?(tup)
        if matching_platform and !Gem::Platform.match(tup.platform)
          pm = (
            rejected_specs[dependency] ||= \
              Gem::PlatformMismatch.new(tup.name, tup.version))
          pm.add_platform tup.platform
          false
        else
          true
        end
      end
    end
  end

  errors += rejected_specs.values

  tuples = []

  found.each do |source, specs|
    specs.each do |s|
      tuples << [s, source]
    end
  end

  tuples = tuples.sort_by { |x| x[0] }

  return [tuples, errors]
end

#spec_for_dependency(dependency, matching_platform = true) ⇒ Object

Find and fetch specs that match dependency.

If matching_platform is false, gems for all platforms are returned.



165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
 
# File 'lib/rubygems/spec_fetcher.rb', line 165

def spec_for_dependency(dependency, matching_platform=true)
  tuples, errors = search_for_dependency(dependency, matching_platform)

  specs = []
  tuples.each do |tup, source|
    begin
      spec = source.fetch_spec(tup)
    rescue Gem::RemoteFetcher::FetchError => e
      errors << Gem::SourceFetchProblem.new(source, e)
    else
      specs << [spec, source]
    end
  end

  return [specs, errors]
end

#suggest_gems_from_name(gem_name) ⇒ Object

Suggests gems based on the supplied gem_name. Returns an array of alternative gem names.



186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
 
# File 'lib/rubygems/spec_fetcher.rb', line 186

def suggest_gems_from_name gem_name
  gem_name        = gem_name.downcase.tr('_-', '')
  max             = gem_name.size / 2
  names           = available_specs(:complete).first.values.flatten(1)

  matches = names.map { |n|
    next unless n.match_platform?

    distance = levenshtein_distance gem_name, n.name.downcase.tr('_-', '')

    next if distance >= max

    return [n.name] if distance == 0

    [n.name, distance]
  }.compact

  matches = matches.uniq.sort_by { |name, dist| dist }

  matches.first(5).map { |name, dist| name }
end

#tuples_for(source, type, gracefully_ignore = false) ⇒ Object

Retrieves NameTuples from source of the given type (:prerelease, etc.). If gracefully_ignore is true, errors are ignored.



260
261
262
263
264
265
266
267
268
269
270
271
272
273
 
# File 'lib/rubygems/spec_fetcher.rb', line 260

def tuples_for(source, type, gracefully_ignore=false) # :nodoc:
  cache = @caches[type]

  tuples =
    begin
      cache[source.uri] ||=
        source.load_specs(type).sort_by { |tup| tup.name }
    rescue Gem::RemoteFetcher::FetchError
      raise unless gracefully_ignore
      []
    end

  tuples
end