Class: NCC::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/ncc/connection.rb

Direct Known Subclasses

AWS, OpenStack

Defined Under Namespace

Classes: AWS, OpenStack

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ncc, cloud, opt = {}) ⇒ Connection

Returns a new instance of Connection.



43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/ncc/connection.rb', line 43

def initialize(ncc, cloud, opt={})
    @ncc = ncc
    @cache = { }
    @cfg = ncc.config
    @cfg_mtime = @cfg.mtime
    @cloud = cloud
    @logger = opt[:logger] if opt.has_key? :logger
    @cache_timeout = opt[:cache_timeout] || 600
    @auth_retry_limit = opt[:auth_retry_limit] || 1
    do_connect
end

Instance Attribute Details

#fog ⇒ Object (readonly)

Returns the value of attribute fog.



28
29
30
 
# File 'lib/ncc/connection.rb', line 28

def fog
  @fog
end

Class Method Details

.connect(ncc, cloud = :default, opt = {}) ⇒ Object 



30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/ncc/connection.rb', line 30

def self.connect(ncc, cloud=:default, opt={})
    cfg = ncc.config
    provider = cfg[:clouds][cloud]['provider']
    case provider
    when 'aws'
        require 'ncc/connection/aws'
        NCC::Connection::AWS.new(ncc, cloud, opt)
    when 'openstack'
        require 'ncc/connection/openstack'
        NCC::Connection::OpenStack.new(ncc, cloud, opt)
    end
end

Instance Method Details

#collection(type, key = nil) ⇒ Object 



290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'lib/ncc/connection.rb', line 290

def collection(type, key=nil)
    maybe_invalidate type
    @cache[type] ||= {
        :timestamp => Time.now,
        :data => Hash[get_provider_objects(type).map { |o| [o.id, o] }]
    }
    if key.nil?
        @cache[type][:data].values
    else
        @cache[type][:data][key]
    end
end

#communication_error(message) ⇒ Object

Raises:



552
553
554
555
556
 
# File 'lib/ncc/connection.rb', line 552

def communication_error(message)
    message = "Error communicating with #{provider} cloud #{@cloud}: " + message unless
        /Error .*communicating with/.match(message)
    raise NCC::Error::Cloud, message
end

#connection_params ⇒ Object 



100
101
102
 
# File 'lib/ncc/connection.rb', line 100

def connection_params
    []
end

#console_log(instance_id) ⇒ Object

Raises:



576
577
578
579
 
# File 'lib/ncc/connection.rb', line 576

def console_log(instance_id)
    raise NCC::Error::NotFound, "Cloud #{@cloud} provider " +
        "#{provider} does not support console logs"
end

#create_instance(instance_spec, wait_for_ip = 60) ⇒ Object 



488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
 
# File 'lib/ncc/connection.rb', line 488

def create_instance(instance_spec, wait_for_ip=60)
    if ! instance_spec.kind_of? NCC::Instance
        instance_spec = NCC::Instance.new(@cfg, instance_spec)
    end
    req_id = ['ncc',
        @cloud,
        UUIDTools::UUID.random_create.to_s].join('-')
    begin
        info "#{@cloud} requesting name from inventory using #{req_id}"
        fqdn = @ncc.inventory.get_or_assign_system_name(req_id)['fqdn']
    rescue StandardError => e
        raise NCC::Error::Cloud, "Error [#{e.class}] " +
            "communicating with inventory to " +
            "assign name using (ncc_req_id=#{req_id}): #{e.message}"
    end
    instance_spec.name = fqdn
    begin
        req = provider_request(instance_spec)
        t0 = Time.now
        info "#{@cloud} sending request: #{req.inspect}"
        server = do_fog { |fog| fog.servers.create(req) }
        # The reason we wait for an IP is so we can add it to
        # inventory, which then calculates the datacenter
        if wait_for_ip > 0 and instance_ip_address(server).nil?
            info "#{@cloud} waiting for ip on #{server.id}"
            this = self
            server.wait_for(wait_for_ip) { this.instance_ip_address(server) }
        end
    rescue StandardError => err
        inv_update = { 'fqdn' => fqdn, 'status' => 'decommissioned' }
        if ! server.nil? and server.id
            inv_update['serial_number'] = server.id
        end
        @ncc.inventory.update('system', inv_update, fqdn)
        server_id = (server.nil? ? 'nil' : server.id)
        communication_error "[#{err.class}] (ncc_req_id=#{req_id} " +
            "instance_id=#{server_id}): #{err.message}"
    end
    elapsed = Time.now - t0
    info "Created instance instance_id=#{server.id} at #{provider} cloud #{@cloud} in #{elapsed}s"
    instance = instance_for server
    instance_spec.id = instance.id
    instance_spec.ip_address = instance.ip_address
    instance_spec.host = instance.host
    inv_req = inventory_request(instance_spec)
    inv_req['cloud'] = @cloud
    inv_req['status'] = 'building'
    begin
        info "#{@cloud} updating inventory #{fqdn}/#{req_id} -> #{inv_req.inspect}"
        @ncc.inventory.update('system', inv_req, fqdn)
    rescue StandardError => e
        raise NCC::Error::Cloud, "Error [#{e.class}] updating inventory " +
            "system #{fqdn} " +
            "(cloud=#{@cloud} ncc_req_id=#{req_id} " +
            "instance_id=#{server.id}): " + e.message
    end
    instance
end

#current? ⇒ Boolean

Returns:

  • (Boolean) 


55
56
57
58
 
# File 'lib/ncc/connection.rb', line 55

def current?
    provider == @cfg[:clouds][@cloud]['provider'] and
        @cfg_mtime == @cfg[:clouds][@cloud].mtime
end

#debug(msg = nil) ⇒ Object 



81
82
83
84
85
86
 
# File 'lib/ncc/connection.rb', line 81

def debug(msg=nil)
    msg ||= yield if block_given?
    if @logger and @logger.respond_to? :debug
        @logger.debug "#{self} #{msg}"
    end
end

#delete(instance_id) ⇒ Object 



558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
 
# File 'lib/ncc/connection.rb', line 558

def delete(instance_id)
    server = do_fog { |fog| fog.servers.get(instance_id) }
    if server.nil?
        instance_not_found instance_id
    else
        begin
            instance = instance_for server
            server.destroy
            inv_update = { 'fqdn' => instance.name,
                'status' => 'decommissioned' }
            @ncc.inventory.update('system', inv_update, instance.name)
        rescue StandardError => e
            communication_error "deleting fqdn=#{instance.name} " +
                "instance_id=#{server.id}: #{e.message}"
        end
    end
end

#do_connect ⇒ Object 



104
105
106
107
108
109
110
111
 
# File 'lib/ncc/connection.rb', line 104

def do_connect
    cloud_config = @cfg[:clouds][@cloud]
    pnames = connection_params + ['provider']
    params = Hash[cloud_config.to_hash(*pnames).map do |k, v|
                      [k.intern, v]
                  end ]
    @fog = Fog::Compute.new(params)
end

#do_fog ⇒ Object 



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
 
# File 'lib/ncc/connection.rb', line 113

def do_fog
    do_connect unless @fog
    remaining_tries = @auth_retry_limit
    begin
        yield @fog
    rescue Excon::Errors::Unauthorized => err
        # might be an expired auth token, retry
        if remaining_tries > 0
            do_connect
            remaining_tries -= 1
            retry
        else
            @fog = nil
            raise NCC::Error::Cloud, "Error communicating with #{provider} " +
                "cloud #{@cloud} (#{e.class}): #{e.message}"
        end
    rescue NCC::Error::Cloud => err
        @fog = nil
        raise err
    rescue NCC::Error => err
        raise err
    rescue StandardError => err
        @fog = nil
        raise NCC::Error::Cloud, "Error communicating with #{provider} " +
            "cloud #{@cloud} [#{err.class}]: #{err.message}"
    end
end

#fields(obj, *flist) ⇒ Object 



147
148
149
 
# File 'lib/ncc/connection.rb', line 147

def fields(obj, *flist)
    Hash[flist.map { |f| [f, obj.send(f)] }]
end

#generic_provider_request(instance) ⇒ Object 



445
446
447
448
449
450
451
 
# File 'lib/ncc/connection.rb', line 445

def generic_provider_request(instance)
    {
        :name => instance.name,
        :flavor => map_to_provider_id(:size, instance.size),
        :size => map_to_provider_id(:image, instance.image),
    }.merge(instance.extra provider)
end

#generic_translate(abstract_object_type, provider_object) ⇒ Object 



371
372
373
374
375
376
377
378
379
380
381
 
# File 'lib/ncc/connection.rb', line 371

def generic_translate(abstract_object_type, provider_object)
    abstract_object =  {
        'id' => id_of(abstract_object_type, provider_object),
        'provider_id' => provider_object.id
    }
    [:name, :description].each do |field|
        abstract_object[field.to_s] = provider_object.send(field) if
            provider_object.respond_to? field
    end
    abstract_object
end

#get_provider_object(provider_object_spec) ⇒ Object 



319
320
321
322
323
324
325
326
327
328
329
330
331
 
# File 'lib/ncc/connection.rb', line 319

def get_provider_object(provider_object_spec)
    abstract_object_type, abstract_object_id = provider_object_spec.first
    if id_field(abstract_object_type) != :id
        collection(abstract_object_type).find do |provider_object|
            id_of(abstract_object_type, provider_object) ==
                abstract_object_id
        end
    else
        provider_object_id = map_to_provider_id(abstract_object_type,
                                             abstract_object_id)
        collection(abstract_object_type, provider_object_id)
    end
end

#get_provider_objects(type) ⇒ Object 



303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
 
# File 'lib/ncc/connection.rb', line 303

def get_provider_objects(type)
    enum = case type
           when :size
               :flavors
           when :image
               :images
           end
    if use_only_mapped(type) and id_field(type) == :id
        id_map(type).values.map do |id|
            do_fog { |fog| fog.send(enum).get(id) }
        end
    else
        do_fog { |fog| fog.send(enum) }
    end
end

#host_fqdn(host) ⇒ Object 



476
477
478
479
480
481
482
 
# File 'lib/ncc/connection.rb', line 476

def host_fqdn(host)
    if @cfg[:clouds][@cloud].has_key? 'host_domain'
        host + '.' + @cfg[:clouds][@cloud]['host_domain']
    else
        host
    end
end

#id_field(abstract_object_type) ⇒ Object 



265
266
267
268
269
270
271
272
 
# File 'lib/ncc/connection.rb', line 265

def id_field(abstract_object_type)
    methodname = abstract_object_type.to_s + '_id_field'
    if self.respond_to? methodname
        self.send methodname
    else
        :id
    end
end

#id_map(type) ⇒ Object 



187
188
189
190
191
192
193
194
195
196
197
198
199
200
 
# File 'lib/ncc/connection.rb', line 187

def id_map(type)
    debug "making id_map for #{type.inspect}"
    keyname = keyname_for(type)
    r = { }
    debug "keyname = #{keyname} (for #{type.inspect})"
    debug "provider map: #{@cfg[:providers][provider].to_hash.inspect}"
    r.update(id_map_hash(@cfg[:providers][provider][keyname].to_hash)) if
        @cfg[:providers][provider].has_key? keyname
    #debug "cloud map: #{@cfg[:clouds][@cloud][keyname].to_hash}"
    r.update(id_map_hash(@cfg[:clouds][@cloud][keyname].to_hash)) if
        @cfg[:clouds][@cloud].has_key? keyname
    debug "  >> #{r.inspect}"
    r
end

#id_map_hash(h) ⇒ Object

Something like “images” => { “$abstract_id” => x } can have an x where it’s the provider id, or an x which is a hash. If the hash has an id key, than that is used as a mapped id, if it doesn’t, it’s ignored (for the purposes of id mapping) -jbrinkley/20130410



173
174
175
176
177
178
179
180
181
182
183
184
185
 
# File 'lib/ncc/connection.rb', line 173

def id_map_hash(h)
    Hash[
    h.map do |k, v|
             if v.respond_to? :has_key?
                 if v.has_key? 'id'
                     [k, v['id']]
                 end
             else
                 [k, v]
             end
         end.reject { |p| p.nil? }
                       ]
end

#id_of(abstract_object_type, obj) ⇒ Object 



274
275
276
277
 
# File 'lib/ncc/connection.rb', line 274

def id_of(abstract_object_type, obj)
    map_to_id(abstract_object_type,
           translated_id_of(abstract_object_type, obj))
end

#ids(a) ⇒ Object 



151
152
153
 
# File 'lib/ncc/connection.rb', line 151

def ids(a)
    Hash[a.map { |e| [e['id'], e] }]
end

#images(image_id = nil) ⇒ Object 



254
255
256
257
258
259
260
261
262
263
 
# File 'lib/ncc/connection.rb', line 254

def images(image_id=nil)
    if image_id.nil?
        collection(:image).find_all do |provider_image|
                @cfg[:images].has_key? id_of(:image, provider_image)
            end.map { |i| object_of(:image, i) }
    else
        object_of(:image,
               get_provider_object(:image => image_id))
    end
end

#info(msg) ⇒ Object 



94
95
96
97
98
 
# File 'lib/ncc/connection.rb', line 94

def info(msg)
    if @logger and @logger.respond_to? :info
        @logger.info "#{self} #{msg}"
    end
end

#instance_for(server) ⇒ Object 



383
384
385
386
387
388
389
390
391
392
393
394
 
# File 'lib/ncc/connection.rb', line 383

def instance_for(server)
    instance = NCC::Instance.new(@cfg, :logger => @logger)
    instance.set_without_validation(:id => server.id)
    instance.set_without_validation(:name => instance_name(server))
    instance.set_without_validation(:size => instance_size(server))
    instance.set_without_validation(:image => instance_image(server))
    instance.set_without_validation(:ip_address =>
                         instance_ip_address(server))
    instance.set_without_validation(:host => instance_host(server))
    instance.set_without_validation(:status => instance_status(server))
    instance
end

#instance_host(server) ⇒ Object 



412
413
414
 
# File 'lib/ncc/connection.rb', line 412

def instance_host(server)
    nil
end

#instance_image(server) ⇒ Object 



404
405
406
 
# File 'lib/ncc/connection.rb', line 404

def instance_image(server)
    map_to_id(:image, server.image)
end

#instance_ip_address(server) ⇒ Object 



416
417
418
 
# File 'lib/ncc/connection.rb', line 416

def instance_ip_address(server)
    server.ip_address
end

#instance_name(server) ⇒ Object 



396
397
398
 
# File 'lib/ncc/connection.rb', line 396

def instance_name(server)
    server.name
end

#instance_not_found(instance_id) ⇒ Object

Raises:



547
548
549
550
 
# File 'lib/ncc/connection.rb', line 547

def instance_not_found(instance_id)
    raise NCC::Error::NotFound, "Instance #{instance_id.inspect} not " +
        "found in #{provider} cloud #{@cloud}"
end

#instance_size(server) ⇒ Object 



400
401
402
 
# File 'lib/ncc/connection.rb', line 400

def instance_size(server)
    map_to_id(:size, server.size)
end

#instance_status(server) ⇒ Object 



408
409
410
 
# File 'lib/ncc/connection.rb', line 408

def instance_status(server)
    map_to_status(server.status)
end

#instances(instance_id = nil) ⇒ Object 



420
421
422
423
424
425
426
427
428
429
430
431
 
# File 'lib/ncc/connection.rb', line 420

def instances(instance_id=nil)
    debug "instances(#{instance_id.inspect})"
    if instance_id.nil?
        do_fog { |fog| fog.servers }.map { |server| instance_for server }
    else
        server = do_fog { |fog| fog.servers.get instance_id }
        if server.nil?
            instance_not_found instance_id
        end
        instance_for server
    end
end

#inventory_request(instance) ⇒ Object 



461
462
463
464
465
466
467
468
469
470
471
472
473
474
 
# File 'lib/ncc/connection.rb', line 461

def inventory_request(instance)
    i = instance.with_defaults(@cfg[:clouds][@cloud]['defaults'],
                      @cfg[:providers][provider]['defaults'])
    {
        'fqdn' => i.name,
        'size' => i.size,
        'image' => i.image,
        'serial_number' => i.id,
        'roles' => i.role.sort.join(','),
        'ip_address' => i.ip_address,
        'host_fqdn' => host_fqdn(i.host),
        'environment_name' => i.environment
    }.merge(instance.extra 'inventory')
end

#keyintern(h) ⇒ Object 



453
454
455
456
457
458
459
 
# File 'lib/ncc/connection.rb', line 453

def keyintern(h)
    Hash[h.map do |k, v|
             [k.to_sym,
                 ((v.is_a? Hash and (k.to_sym != :tags)) ?
                     keyintern(v) : v)]
         end]
end

#keyname_for(type) ⇒ Object 



159
160
161
162
163
164
165
166
 
# File 'lib/ncc/connection.rb', line 159

def keyname_for(type)
    case type
    when :size
        'sizes'
    when :image
        'images'
    end
end

#map_from_raw_provider_id(type, raw_provider_id) ⇒ Object

raw meaning not using “our” notion of id_field



226
227
228
229
230
231
232
 
# File 'lib/ncc/connection.rb', line 226

def map_from_raw_provider_id(type, raw_provider_id)
    # Using collection here for cache
    provider_object = collection(type).find do |item|
        item.id == raw_provider_id
    end
    id_of(type, provider_object)
end

#map_to_id(type, provider_id) ⇒ Object 



216
217
218
219
 
# File 'lib/ncc/connection.rb', line 216

def map_to_id(type, provider_id)
    debug "provider_id_map = #{provider_id_map(type).inspect}"
    provider_id_map(type)[provider_id] || provider_id
end

#map_to_provider_id(type, abstract_id) ⇒ Object 



221
222
223
 
# File 'lib/ncc/connection.rb', line 221

def map_to_provider_id(type, abstract_id)
    id_map(type)[abstract_id] || abstract_id
end

#map_to_provider_status(abstract_status) ⇒ Object 



238
239
240
 
# File 'lib/ncc/connection.rb', line 238

def map_to_provider_status(abstract_status)
    abstract_status
end

#map_to_status(provider_status) ⇒ Object 



234
235
236
 
# File 'lib/ncc/connection.rb', line 234

def map_to_status(provider_status)
    provider_status
end

#maybe_invalidate(type) ⇒ Object 



60
61
62
63
64
65
 
# File 'lib/ncc/connection.rb', line 60

def maybe_invalidate(type)
    if @cache.has_key? type
        @cache.delete(type) if
            (Time.now - @cache[type][:timestamp]) > @cache_timeout
    end
end

#me ⇒ Object 



67
68
69
 
# File 'lib/ncc/connection.rb', line 67

def me
    [self.class, provider, @cloud].join(' ')
end

#merge_configured(abstract_object, data) ⇒ Object 



343
344
345
346
347
348
349
 
# File 'lib/ncc/connection.rb', line 343

def merge_configured(abstract_object, data)
    if data.respond_to? :each_pair
        data.each_pair { |k, v| abstract_object[k] ||= v }
    else
        abstract_object['provider_id'] ||= data
    end
end

#modify_instance_request(instance) ⇒ Object 



484
485
486
 
# File 'lib/ncc/connection.rb', line 484

def modify_instance_request(instance)
    instance
end

#notice(msg) ⇒ Object 



88
89
90
91
92
 
# File 'lib/ncc/connection.rb', line 88

def notice(msg)
    if @logger and @logger.respond_to? :notice
        @logger.notice "#{self} #{msg}"
    end
end

#object_of(abstract_object_type, provider_object) ⇒ Object 



351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
 
# File 'lib/ncc/connection.rb', line 351

def object_of(abstract_object_type, provider_object)
    debug "object_of(#{abstract_object_type.inspect}, #{provider_object})"
    abstract_object = translate(abstract_object_type, provider_object)
    keyname = keyname_for abstract_object_type
    id = abstract_object['id']
    [@cfg[:clouds][@cloud], @cfg[:providers][provider]].each do |cfg|
        if cfg.has_key? keyname and cfg[keyname].has_key? id
            debug "merging cloud/provider data: cfg[#{keyname}][#{id}]"
            merge_configured(abstract_object, cfg[keyname][id])
        end
    end
    if @cfg.has_key? keyname.intern and @cfg[keyname.intern].has_key? id
        debug "merging abstract data: " +
            "@cfg[#{keyname.intern.inspect}][#{id}]"
        merge_configured(abstract_object, @cfg[keyname.intern][id].to_hash)
    end
    debug "object_of returns: #{abstract_object.inspect}"
    abstract_object
end

#provider ⇒ Object 



155
156
157
 
# File 'lib/ncc/connection.rb', line 155

def provider
    generic
end

#provider_id_map(type) ⇒ Object 



202
203
204
205
206
207
208
209
210
211
212
213
214
 
# File 'lib/ncc/connection.rb', line 202

def provider_id_map(type)
    debug "making provider_id_map for #{type.inspect}"
    keyname = keyname_for(type)
    r = { }
    r.update(id_map_hash(@cfg[:providers][provider][keyname].
                         to_hash).invert) if
        @cfg[:providers][provider].has_key? keyname
    r.update(id_map_hash(@cfg[:clouds][@cloud][keyname].
                         to_hash).invert) if
        @cfg[:clouds][@cloud].has_key? keyname
    debug "  >>> #{r.inspect}"
    r
end

#provider_request(instance) ⇒ Object 



433
434
435
436
437
438
439
 
# File 'lib/ncc/connection.rb', line 433

def provider_request(instance)
    keyintern(
    provider_request_of(instance.
                     with_defaults(@cfg[:clouds][@cloud]['defaults'],
                          @cfg[:providers][provider]['defaults']))
    )
end

#provider_request_of(instance) ⇒ Object 



441
442
443
 
# File 'lib/ncc/connection.rb', line 441

def provider_request_of(instance)
    generic_provider_request(instance)
end

#reboot(instance_id) ⇒ Object 



581
582
583
584
585
586
587
588
 
# File 'lib/ncc/connection.rb', line 581

def reboot(instance_id)
    server = do_fog { |fog| fog.servers.get(instance_id) }
    if server.nil?
        instance_not_found instance_id
    else
        server.reboot
    end
end

#sizes(size_id = nil) ⇒ Object 



242
243
244
245
246
247
248
249
250
251
252
 
# File 'lib/ncc/connection.rb', line 242

def sizes(size_id=nil)
    debug "sizes(#{size_id.inspect})"
    if size_id.nil?
        collection(:size).find_all do |flavor|
                @cfg[:sizes].has_key? id_of(:size, flavor)
            end.map { |f| object_of(:size, f) }
    else
        object_of(:size,
               get_provider_object(:size => size_id))
    end
end

#to_s ⇒ Object 



71
72
73
 
# File 'lib/ncc/connection.rb', line 71

def to_s
    '#<' + me + '>'
end

#translate(abstract_object_type, provider_object) ⇒ Object 



333
334
335
336
337
338
339
340
341
 
# File 'lib/ncc/connection.rb', line 333

def translate(abstract_object_type, provider_object)
    debug "translate(#{abstract_object_type.inspect}, #{provider_object})"
    methodname = 'translate_' + abstract_object_type.to_s
    if self.respond_to? methodname
        self.send(methodname, provider_object)
    else
        generic_translate(abstract_object_type, provider_object)
    end
end

#translated_id_of(abstract_object_type, obj) ⇒ Object 



279
280
281
282
283
284
285
286
287
288
 
# File 'lib/ncc/connection.rb', line 279

def translated_id_of(abstract_object_type, obj)
    id_fielder = id_field abstract_object_type
    if id_fielder.kind_of? Proc
        id_fielder.call obj
    elsif obj.nil?
        nil
    else
        obj.send id_fielder
    end
end

#use_only_mapped(type) ⇒ Object

Warning. use_only_mapped is ignored for types with alternate id fields



143
144
145
 
# File 'lib/ncc/connection.rb', line 143

def use_only_mapped(type)
    false
end

#warn(msg) ⇒ Object 



75
76
77
78
79
 
# File 'lib/ncc/connection.rb', line 75

def warn(msg)
    if @logger and @logger.respond_to? :warn
        @logger.warn "#{self} #{msg}"
    end
end