Class: Gem::RemoteFetcher

Inherits:
Object
  • Object
show all
Includes:
UserInteraction
Defined in:
lib/rubygems/remote_fetcher.rb

Overview

RemoteFetcher handles the details of fetching gems and gem information from a remote source.

Defined Under Namespace

Classes: FetchError, UnknownHostError

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from UserInteraction

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

Methods included from DefaultUserInteraction

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

Methods included from Text

#clean_text, #format_text, #levenshtein_distance, #min3, #truncate_text

Constructor Details

#initialize(proxy = nil, dns = nil, headers = {}) ⇒ RemoteFetcher

Initialize a remote fetcher using the source URI and possible proxy information.

proxy

  • [String]: explicit specification of proxy; overrides any environment

    variable setting

  • nil: respect environment variables (HTTP_PROXY, HTTP_PROXY_USER,

    HTTP_PROXY_PASS)

  • :no_proxy: ignore environment variables and _don’t_ use a proxy

headers: A set of additional HTTP headers to be sent to the server when

fetching the gem.



75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# File 'lib/rubygems/remote_fetcher.rb', line 75

def initialize(proxy=nil, dns=nil, headers={})
  require_relative "core_ext/tcpsocket_init" if Gem.configuration.ipv4_fallback_enabled
  require_relative "vendored_net_http"
  require_relative "vendor/uri/lib/uri"

  Socket.do_not_reverse_lookup = true

  @proxy = proxy
  @pools = {}
  @pool_lock = Thread::Mutex.new
  @cert_files = Gem::Request.get_cert_files

  @headers = headers
end

Instance Attribute Details

#headers ⇒ Object

Returns the value of attribute headers.



59
60
61
 
# File 'lib/rubygems/remote_fetcher.rb', line 59

def headers
  @headers
end

Class Method Details

.fetcher ⇒ Object

Cached RemoteFetcher instance.



55
56
57
 
# File 'lib/rubygems/remote_fetcher.rb', line 55

def self.fetcher
  @fetcher ||= new Gem.configuration[:http_proxy]
end

Instance Method Details

#cache_update_path(uri, path = nil, update = true) ⇒ Object

Downloads uri to path if necessary. If no path is given, it just passes the data.



286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
 
# File 'lib/rubygems/remote_fetcher.rb', line 286

def cache_update_path(uri, path = nil, update = true)
  mtime = begin
            path && File.stat(path).mtime
          rescue StandardError
            nil
          end

  data = fetch_path(uri, mtime)

  if data.nil? # indicates the server returned 304 Not Modified
    return Gem.read_binary(path)
  end

  if update && path
    Gem.write_binary(path, data)
  end

  data
end

#close_all ⇒ Object 



326
327
328
 
# File 'lib/rubygems/remote_fetcher.rb', line 326

def close_all
  @pools.each_value(&:close_all)
end

#download(spec, source_uri, install_dir = Gem.dir) ⇒ Object

Moves the gem spec from source_uri to the cache dir unless it is already there. If the source_uri is local the gem cache dir copy is always replaced.



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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
 
# File 'lib/rubygems/remote_fetcher.rb', line 112

def download(spec, source_uri, install_dir = Gem.dir)
  install_cache_dir = File.join install_dir, "cache"
  cache_dir =
    if Dir.pwd == install_dir # see fetch_command
      install_dir
    elsif File.writable?(install_cache_dir) || (File.writable?(install_dir) && !File.exist?(install_cache_dir))
      install_cache_dir
    else
      File.join Gem.user_dir, "cache"
    end

  gem_file_name = File.basename spec.cache_file
  local_gem_path = File.join cache_dir, gem_file_name

  require "fileutils"
  begin
    FileUtils.mkdir_p cache_dir
  rescue StandardError
    nil
  end unless File.exist? cache_dir

  source_uri = Gem::Uri.new(source_uri)

  scheme = source_uri.scheme

  # Gem::URI.parse gets confused by MS Windows paths with forward slashes.
  scheme = nil if /^[a-z]$/i.match?(scheme)

  # REFACTOR: split this up and dispatch on scheme (eg download_http)
  # REFACTOR: be sure to clean up fake fetcher when you do this... cleaner
  case scheme
  when "http", "https", "s3" then
    unless File.exist? local_gem_path
      begin
        verbose "Downloading gem #{gem_file_name}"

        remote_gem_path = source_uri + "gems/#{gem_file_name}"

        cache_update_path remote_gem_path, local_gem_path
      rescue FetchError
        raise if spec.original_platform == spec.platform

        alternate_name = "#{spec.original_name}.gem"

        verbose "Failed, downloading gem #{alternate_name}"

        remote_gem_path = source_uri + "gems/#{alternate_name}"

        cache_update_path remote_gem_path, local_gem_path
      end
    end
  when "file" then
    begin
      path = source_uri.path
      path = File.dirname(path) if File.extname(path) == ".gem"

      remote_gem_path = Gem::Util.correct_for_windows_path(File.join(path, "gems", gem_file_name))

      FileUtils.cp(remote_gem_path, local_gem_path)
    rescue Errno::EACCES
      local_gem_path = source_uri.to_s
    end

    verbose "Using local gem #{local_gem_path}"
  when nil then # TODO: test for local overriding cache
    source_path = if Gem.win_platform? && source_uri.scheme &&
                     !source_uri.path.include?(":")
      "#{source_uri.scheme}:#{source_uri.path}"
    else
      source_uri.path
    end

    source_path = Gem::UriFormatter.new(source_path).unescape

    begin
      FileUtils.cp source_path, local_gem_path unless
        File.identical?(source_path, local_gem_path)
    rescue Errno::EACCES
      local_gem_path = source_uri.to_s
    end

    verbose "Using local gem #{local_gem_path}"
  else
    raise ArgumentError, "unsupported URI scheme #{source_uri.scheme}"
  end

  local_gem_path
end

#download_to_cache(dependency) ⇒ Object

Given a name and requirement, downloads this gem into cache and returns the filename. Returns nil if the gem cannot be located. – Should probably be integrated with #download below, but that will be a larger, more encompassing effort. -erikh



97
98
99
100
101
102
103
104
105
 
# File 'lib/rubygems/remote_fetcher.rb', line 97

def download_to_cache(dependency)
  found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dependency

  return if found.empty?

  spec, source = found.max_by {|(s,_)| s.version }

  download spec, source.uri
end

#fetch_file(uri, *_) ⇒ Object

File Fetcher. Dispatched by fetch_path. Use it instead.



204
205
206
 
# File 'lib/rubygems/remote_fetcher.rb', line 204

def fetch_file(uri, *_)
  Gem.read_binary Gem::Util.correct_for_windows_path uri.path
end

#fetch_http(uri, last_modified = nil, head = false, depth = 0) ⇒ Object Also known as: fetch_https

HTTP Fetcher. Dispatched by fetch_path. Use it instead.



211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
 
# File 'lib/rubygems/remote_fetcher.rb', line 211

def fetch_http(uri, last_modified = nil, head = false, depth = 0)
  fetch_type = head ? Gem::Net::HTTP::Head : Gem::Net::HTTP::Get
  response   = request uri, fetch_type, last_modified do |req|
    headers.each {|k,v| req.add_field(k,v) }
  end

  case response
  when Gem::Net::HTTPOK, Gem::Net::HTTPNotModified then
    response.uri = uri
    head ? response : response.body
  when Gem::Net::HTTPMovedPermanently, Gem::Net::HTTPFound, Gem::Net::HTTPSeeOther,
       Gem::Net::HTTPTemporaryRedirect then
    raise FetchError.new("too many redirects", uri) if depth > 10

    unless location = response["Location"]
      raise FetchError.new("redirecting but no redirect location was given", uri)
    end
    location = Gem::Uri.new location

    if https?(uri) && !https?(location)
      raise FetchError.new("redirecting to non-https resource: #{location}", uri)
    end

    fetch_http(location, last_modified, head, depth + 1)
  else
    raise FetchError.new("bad response #{response.message} #{response.code}", uri)
  end
end

#fetch_path(uri, mtime = nil, head = false) ⇒ Object

Downloads uri and returns it as a String.



245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
 
# File 'lib/rubygems/remote_fetcher.rb', line 245

def fetch_path(uri, mtime = nil, head = false)
  uri = Gem::Uri.new uri

  unless uri.scheme
    raise ArgumentError, "uri scheme is invalid: #{uri.scheme.inspect}"
  end

  data = send "fetch_#{uri.scheme}", uri, mtime, head

  if data && !head && uri.to_s.end_with?(".gz")
    begin
      data = Gem::Util.gunzip data
    rescue Zlib::GzipFile::Error
      raise FetchError.new("server did not return a valid file", uri)
    end
  end

  data
rescue Gem::Timeout::Error, IOError, SocketError, SystemCallError,
       *(OpenSSL::SSL::SSLError if Gem::HAVE_OPENSSL) => e
  raise FetchError.new("#{e.class}: #{e}", uri)
end

#fetch_s3(uri, mtime = nil, head = false) ⇒ Object 



268
269
270
271
272
273
274
275
 
# File 'lib/rubygems/remote_fetcher.rb', line 268

def fetch_s3(uri, mtime = nil, head = false)
  begin
    public_uri = s3_uri_signer(uri).sign
  rescue Gem::S3URISigner::ConfigurationError, Gem::S3URISigner::InstanceProfileError => e
    raise FetchError.new(e.message, "s3://#{uri.host}")
  end
  fetch_https public_uri, mtime, head
end

#https?(uri) ⇒ Boolean

Returns:

  • (Boolean) 


322
323
324
 
# File 'lib/rubygems/remote_fetcher.rb', line 322

def https?(uri)
  uri.scheme.casecmp("https").zero?
end

#request(uri, request_class, last_modified = nil) ⇒ Object

Performs a Gem::Net::HTTP request of type request_class on uri returning a Gem::Net::HTTP response object. request maintains a table of persistent connections to reduce connect overhead.



311
312
313
314
315
316
317
318
319
320
 
# File 'lib/rubygems/remote_fetcher.rb', line 311

def request(uri, request_class, last_modified = nil)
  proxy = proxy_for @proxy, uri
  pool  = pools_for(proxy).pool_for uri

  request = Gem::Request.new uri, request_class, last_modified, pool

  request.fetch do |req|
    yield req if block_given?
  end
end

#s3_uri_signer(uri) ⇒ Object

we have our own signing code here to avoid a dependency on the aws-sdk gem



278
279
280
 
# File 'lib/rubygems/remote_fetcher.rb', line 278

def s3_uri_signer(uri)
  Gem::S3URISigner.new(uri)
end