Class: S3Sync::SyncCommand

Inherits:
Object
  • Object
show all
Defined in:
lib/s3sync/sync.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args, source, destination) ⇒ SyncCommand

Returns a new instance of SyncCommand.



174
175
176
177
178
 
# File 'lib/s3sync/sync.rb', line 174

def initialize args, source, destination
  @args = args
  @source = source
  @destination = destination
end

Class Method Details

.cmp(hash1, hash2) ⇒ Object 



155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
 
# File 'lib/s3sync/sync.rb', line 155

def self.cmp hash1, hash2
  same, to_add_to_2 = [], []

  hash1.each do |key, value|
    value2 = hash2.delete key
    if value2.nil?
      to_add_to_2 << value
    elsif value2 == value
      same << value
    else
      to_add_to_2 << value
    end
  end

  to_remove_from_2 = hash2.values

  [same, to_add_to_2, to_remove_from_2]
end

.parse_params(args) ⇒ Object 



211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
 
# File 'lib/s3sync/sync.rb', line 211

def self.parse_params args
  # Reading the arbitrary parameters from the command line and getting
  # modifiable copies to parse
  source, destination = args; return nil if source.nil? or destination.nil?

  # Sync from one s3 to another is currently not supported
  if remote_prefix? source and remote_prefix? destination
    raise WrongUsage.new(nil, 'Both arguments can\'t be on S3')
  end

  # C'mon, there's rsync out there
  if !remote_prefix? source and !remote_prefix? destination
    raise WrongUsage.new(nil, 'One argument must be on S3')
  end

  source, destination = process_destination source, destination
  return [Location.new(*source), Location.new(*destination)]
end

.process_destination(source, destination) ⇒ Object 



269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
 
# File 'lib/s3sync/sync.rb', line 269

def self.process_destination source, destination
  source, destination = source.dup, destination.dup

  # don't repeat slashes
  source.squeeze! '/'
  destination.squeeze! '/'

  # Making sure that local paths won't break our stuff later
  source.gsub!(/^\.\//, '')
  destination.gsub!(/^\.\//, '')

  # Parsing the final destination
  destination = process_file_destination source, destination, ""

  # here's where we find out what direction we're going
  source_is_s3 = remote_prefix? source

  # canonicalize the S3 stuff
  remote_prefix = source_is_s3 ? source : destination
  bucket, remote_prefix = remote_prefix.split ":"

  remote_prefix ||= ""

  # Just making sure we preserve the direction
  if source_is_s3
    [[remote_prefix, bucket], destination]
  else
    [source, [remote_prefix, bucket]]
  end
end

.process_file_destination(source, destination, file = "") ⇒ Object 



236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
 
# File 'lib/s3sync/sync.rb', line 236

def self.process_file_destination source, destination, file=""
  if not file.empty?
    sub = (remote_prefix? source) ? source.split(":")[1] : source
    file = file.gsub(/^#{sub}/, '')
  end

  # no slash on end of source means we need to append the last src dir to
  # dst prefix testing for empty isn't good enough here.. needs to be
  # "empty apart from potentially having 'bucket:'"
  if source =~ %r{/$}
    if remote_prefix? destination and destination.end_with? ':'
      S3Sync.safe_join [destination, file]
    else
      File.join [destination, file]
    end
  else
    if remote_prefix? source
      _, name = source.split ":"
      File.join [destination, File.basename(name || ""), file]
    else
      source = /^\/?(.*)/.match(source)[1]

      # Corner case: the root of the remote path is empty, we don't want to
      # add an unnecessary slash here.
      if destination.end_with? ':'
        File.join [destination + source, file]
      else
        File.join [destination, source, file]
      end
    end
  end
end

.remote_prefix?(prefix) ⇒ Boolean

Returns:

  • (Boolean) 


230
231
232
233
234
 
# File 'lib/s3sync/sync.rb', line 230

def self.remote_prefix?(prefix)
  # allow for dos-like things e.g. C:\ to be treated as local even with
  # colon.
  prefix.include? ':' and not prefix.match '^[A-Za-z]:[\\\\/]'
end

Instance Method Details

#download_files(destination, source, list) ⇒ Object 



351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
 
# File 'lib/s3sync/sync.rb', line 351

def download_files destination, source, list
  puts list
  list.each {|e|
    path = File.join destination.path, e.path

    if @args.verbose
      puts " + #{source}#{e.path} => #{path}"
    end

    unless @args.dry_run
      obj = @args.s3.buckets[source.bucket].objects[e.path]

      # Making sure this new file will have a safe shelter
      FileUtils.mkdir_p File.dirname(path)

      # in some cases the s3 object will have a trailing '/' indicating
      # a folder (this behavior noticed when the s3 folder is
      # created by Transmit)
      if path[-1] == '/'
        FileUtils.mkdir_p path
      else
        # Downloading and saving the files
        File.open(path, 'wb') do |file|
          begin
            obj.read do |chunk|
              file.write chunk
            end
          rescue AWS::Core::Http::NetHttpHandler::TruncatedBodyError => e
            $stderr.puts "WARNING: (retryable) TruncatedBodyError occured, retrying in a second #{file.basename}"
            sleep 1
            retry
          end
        end
      end
    end
  }
end

#read_tree_remote(location) ⇒ Object 



300
301
302
303
304
305
306
307
308
309
310
311
312
 
# File 'lib/s3sync/sync.rb', line 300

def read_tree_remote location
  dir = location.path
  dir += '/' if not dir.empty? and not dir.end_with?('/')

  nodes = {}
  @args.s3.buckets[location.bucket].objects.with_prefix(dir || "").to_a.collect do |obj|
    # etag comes back with quotes (obj.etag.inspcet # => "\"abc...def\""
    small_comparator = lambda { obj.etag[/[a-z0-9]+/] }
    node = Node.new(location.path, obj.key, obj.content_length, small_comparator)
    nodes[node.path] = node
  end
  return nodes
end

#read_trees(source, destination) ⇒ Object 



314
315
316
317
318
319
320
321
322
323
324
 
# File 'lib/s3sync/sync.rb', line 314

def read_trees source, destination
  if source.local?
    source_tree = LocalDirectory.new(source.path).list_files
    destination_tree = read_tree_remote destination
  else
    source_tree = read_tree_remote source
    destination_tree = LocalDirectory.new(destination.path).list_files
  end

  [source_tree, destination_tree]
end

#remove_files(remote, list) ⇒ Object 



339
340
341
342
343
344
345
346
347
348
349
 
# File 'lib/s3sync/sync.rb', line 339

def remove_files remote, list
  if @args.verbose
    list.each {|e|
      puts " - #{remote}#{e.path}"
    }
  end

  unless @args.dry_run
    @args.s3.buckets[remote.bucket].objects.delete_if { |obj| list.map(&:path).include? obj.key }
  end
end

#remove_local_files(destination, source, list) ⇒ Object 



389
390
391
392
393
394
395
396
397
398
399
400
401
 
# File 'lib/s3sync/sync.rb', line 389

def remove_local_files destination, source, list
  list.each {|e|
    path = File.join destination.path, e.path

    if @args.verbose
      puts " * #{e.path} => #{path}"
    end

    unless @args.dry_run
      FileUtils.rm_rf path
    end
  }
end

#run ⇒ Object 



180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
 
# File 'lib/s3sync/sync.rb', line 180

def run
  # Reading the source and destination using our helper method
  if (source, destination, bucket = self.class.parse_params [@source, @destination]).nil?
    raise WrongUsage.new(nil, 'Need a source and a destination')
  end

  # Getting the trees
  source_tree, destination_tree = read_trees source, destination

  # Getting the list of resources to be exchanged between the two peers
  _, to_add, to_remove = self.class.cmp source_tree, destination_tree

  # Removing the items matching the exclude pattern if requested
  to_add.select! { |e|
    begin
      (e.path =~ /#{@args.exclude}/).nil?
    rescue RegexpError => exc
      raise WrongUsage.new nil, exc.message
    end
  } if @args.exclude

  # Calling the methods that perform the actual IO
  if source.local?
    upload_files destination, to_add
    remove_files destination, to_remove unless @args.keep
  else
    download_files destination, source, to_add
    remove_local_files destination, source, to_remove unless @args.keep
  end
end

#upload_files(remote, list) ⇒ Object 



326
327
328
329
330
331
332
333
334
335
336
337
 
# File 'lib/s3sync/sync.rb', line 326

def upload_files remote, list
  list.each do |e|
    if @args.verbose
      puts " + #{e.full} => #{remote}#{e.path}"
    end

    unless @args.dry_run
      remote_path = "#{remote.path}#{e.path}"
      @args.s3.buckets[remote.bucket].objects[remote_path].write Pathname.new(e.full), :acl => @args.acl
    end
  end
end