doc/MCollective/Facts/Base.html

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  67
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  69
  70                                         <li><a href="#M000263">#get_facts</a></li>
  71
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 333
 334         <div id="documentation">
 335                 <h1 class="class">MCollective::Facts::Base</h1>
 336
 337                 <div id="description">
 338                         <p>
 339 A base class for fact providers, to make a new fully functional fact
 340 provider inherit from this and simply provide a self.get_facts method that
 341 returns a hash like:
 342 </p>
 343 <pre>
 344  {&quot;foo&quot; =&gt; &quot;bar&quot;,
 345   &quot;bar&quot; =&gt; &quot;baz&quot;}
 346 </pre>
 347
 348                 </div>
 349
 350                 <!-- Constants -->
 351
 352
 353                 <!-- Attributes -->
 354
 355
 356                 <!-- Methods -->
 357
 358                 <div id="public-class-method-details" class="method-section section">
 359                         <h3 class="section-header">Public Class Methods</h3>
 360
 361
 362                         <div id="inherited-method" class="method-detail ">
 363                                 <a name="M000260"></a>
 364
 365                                 <div class="method-heading">
 366
 367                                         <span class="method-name">inherited</span><span
 368                                                 class="method-args">(klass)</span>
 369                                         <span class="method-click-advice">click to toggle source</span>
 370
 371                                 </div>
 372
 373                                 <div class="method-description">
 374
 375                                         <p>
 376 Registers new fact sources into the plugin manager
 377 </p>
 378
 379
 380
 381                                         <div class="method-source-code"
 382                                                 id="inherited-source">
 383 <pre>
 384     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 17</span>
 385 17:       <span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">inherited</span>(<span class="ruby-identifier">klass</span>)
 386 18:         <span class="ruby-constant">PluginManager</span> <span class="ruby-operator">&lt;&lt;</span> {<span class="ruby-identifier">:type</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value str">&quot;facts_plugin&quot;</span>, <span class="ruby-identifier">:class</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">to_s</span>}
 387 19:       <span class="ruby-keyword kw">end</span></pre>
 388                                         </div>
 389
 390                                 </div>
 391
 392
 393                         </div>
 394
 395
 396                         <div id="new-method" class="method-detail ">
 397                                 <a name="M000259"></a>
 398
 399                                 <div class="method-heading">
 400
 401                                         <span class="method-name">new</span><span
 402                                                 class="method-args">()</span>
 403                                         <span class="method-click-advice">click to toggle source</span>
 404
 405                                 </div>
 406
 407                                 <div class="method-description">
 408
 409                                         <p class="missing-docs">(Not documented)</p>
 410
 411
 412
 413                                         <div class="method-source-code"
 414                                                 id="new-source">
 415 <pre>
 416     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 10</span>
 417 10:       <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>
 418 11:         <span class="ruby-ivar">@facts</span> = {}
 419 12:         <span class="ruby-ivar">@last_good_facts</span> = {}
 420 13:         <span class="ruby-ivar">@last_facts_load</span> = <span class="ruby-value">0</span>
 421 14:       <span class="ruby-keyword kw">end</span></pre>
 422                                         </div>
 423
 424                                 </div>
 425
 426
 427                         </div>
 428
 429
 430                 </div>
 431
 432                 <div id="public-instance-method-details" class="method-section section">
 433                         <h3 class="section-header">Public Instance Methods</h3>
 434
 435
 436                         <div id="force-reload--method" class="method-detail ">
 437                                 <a name="M000265"></a>
 438
 439                                 <div class="method-heading">
 440
 441                                         <span class="method-name">force_reload?</span><span
 442                                                 class="method-args">()</span>
 443                                         <span class="method-click-advice">click to toggle source</span>
 444
 445                                 </div>
 446
 447                                 <div class="method-description">
 448
 449                                         <p>
 450 Plugins can override this to provide forced fact invalidation
 451 </p>
 452
 453
 454
 455                                         <div class="method-source-code"
 456                                                 id="force-reload--source">
 457 <pre>
 458     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 81</span>
 459 81:       <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">force_reload?</span>
 460 82:         <span class="ruby-keyword kw">false</span>
 461 83:       <span class="ruby-keyword kw">end</span></pre>
 462                                         </div>
 463
 464                                 </div>
 465
 466
 467                         </div>
 468
 469
 470                         <div id="get-fact-method" class="method-detail ">
 471                                 <a name="M000261"></a>
 472
 473                                 <div class="method-heading">
 474
 475                                         <span class="method-name">get_fact</span><span
 476                                                 class="method-args">(fact=nil)</span>
 477                                         <span class="method-click-advice">click to toggle source</span>
 478
 479                                 </div>
 480
 481                                 <div class="method-description">
 482
 483                                         <p>
 484 Returns the value of a single fact
 485 </p>
 486
 487
 488
 489                                         <div class="method-source-code"
 490                                                 id="get-fact-source">
 491 <pre>
 492     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 22</span>
 493 22:       <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">get_fact</span>(<span class="ruby-identifier">fact</span>=<span class="ruby-keyword kw">nil</span>)
 494 23:         <span class="ruby-identifier">config</span> = <span class="ruby-constant">Config</span>.<span class="ruby-identifier">instance</span>
 495 24:
 496 25:         <span class="ruby-identifier">cache_time</span> = <span class="ruby-identifier">config</span>.<span class="ruby-identifier">fact_cache_time</span> <span class="ruby-operator">||</span> <span class="ruby-value">300</span>
 497 26:
 498 27:         <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">exclusive</span> <span class="ruby-keyword kw">do</span>
 499 28:           <span class="ruby-keyword kw">begin</span>
 500 29:             <span class="ruby-keyword kw">if</span> (<span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_i</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@last_facts_load</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">cache_time</span>.<span class="ruby-identifier">to_i</span> ) <span class="ruby-operator">||</span> <span class="ruby-identifier">force_reload?</span>
 501 30:               <span class="ruby-constant">Log</span>.<span class="ruby-identifier">debug</span>(<span class="ruby-node">&quot;Resetting facter cache, now: #{Time.now.to_i} last-known-good: #{@last_facts_load}&quot;</span>)
 502 31:
 503 32:               <span class="ruby-identifier">tfacts</span> = <span class="ruby-identifier">load_facts_from_source</span>
 504 33:
 505 34:               <span class="ruby-comment cmt"># Force reset to last known good state on empty facts</span>
 506 35:               <span class="ruby-identifier">raise</span> <span class="ruby-value str">&quot;Got empty facts&quot;</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">tfacts</span>.<span class="ruby-identifier">empty?</span>
 507 36:
 508 37:               <span class="ruby-ivar">@facts</span>.<span class="ruby-identifier">clear</span>
 509 38:
 510 39:               <span class="ruby-identifier">tfacts</span>.<span class="ruby-identifier">each_pair</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">key</span>,<span class="ruby-identifier">value</span><span class="ruby-operator">|</span>
 511 40:                 <span class="ruby-ivar">@facts</span>[<span class="ruby-identifier">key</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-identifier">value</span>.<span class="ruby-identifier">to_s</span>
 512 41:               <span class="ruby-keyword kw">end</span>
 513 42:
 514 43:               <span class="ruby-ivar">@last_good_facts</span> = <span class="ruby-ivar">@facts</span>.<span class="ruby-identifier">clone</span>
 515 44:               <span class="ruby-ivar">@last_facts_load</span> = <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_i</span>
 516 45:             <span class="ruby-keyword kw">else</span>
 517 46:               <span class="ruby-constant">Log</span>.<span class="ruby-identifier">debug</span>(<span class="ruby-node">&quot;Using cached facts now: #{Time.now.to_i} last-known-good: #{@last_facts_load}&quot;</span>)
 518 47:             <span class="ruby-keyword kw">end</span>
 519 48:           <span class="ruby-keyword kw">rescue</span> <span class="ruby-constant">Exception</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">e</span>
 520 49:             <span class="ruby-constant">Log</span>.<span class="ruby-identifier">error</span>(<span class="ruby-node">&quot;Failed to load facts: #{e.class}: #{e}&quot;</span>)
 521 50:
 522 51:             <span class="ruby-comment cmt"># Avoid loops where failing fact loads cause huge CPU</span>
 523 52:             <span class="ruby-comment cmt"># loops, this way it only retries once every cache_time</span>
 524 53:             <span class="ruby-comment cmt"># seconds</span>
 525 54:             <span class="ruby-ivar">@last_facts_load</span> = <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>.<span class="ruby-identifier">to_i</span>
 526 55:
 527 56:             <span class="ruby-comment cmt"># Revert to last known good state</span>
 528 57:             <span class="ruby-ivar">@facts</span> = <span class="ruby-ivar">@last_good_facts</span>.<span class="ruby-identifier">clone</span>
 529 58:           <span class="ruby-keyword kw">end</span>
 530 59:         <span class="ruby-keyword kw">end</span>
 531 60:
 532 61:
 533 62:         <span class="ruby-comment cmt"># If you do not supply a specific fact all facts will be returned</span>
 534 63:         <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">fact</span>.<span class="ruby-identifier">nil?</span>
 535 64:           <span class="ruby-keyword kw">return</span> <span class="ruby-ivar">@facts</span>
 536 65:         <span class="ruby-keyword kw">else</span>
 537 66:           <span class="ruby-ivar">@facts</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">fact</span>) <span class="ruby-operator">?</span> <span class="ruby-ivar">@facts</span>[<span class="ruby-identifier">fact</span>] <span class="ruby-operator">:</span> <span class="ruby-keyword kw">nil</span>
 538 67:         <span class="ruby-keyword kw">end</span>
 539 68:       <span class="ruby-keyword kw">end</span></pre>
 540                                         </div>
 541
 542                                 </div>
 543
 544
 545                         </div>
 546
 547
 548                         <div id="get-facts-method" class="method-detail ">
 549                                 <a name="M000263"></a>
 550
 551                                 <div class="method-heading">
 552
 553                                         <span class="method-name">get_facts</span><span
 554                                                 class="method-args">()</span>
 555                                         <span class="method-click-advice">click to toggle source</span>
 556
 557                                 </div>
 558
 559                                 <div class="method-description">
 560
 561                                         <p>
 562 Returns all facts
 563 </p>
 564
 565
 566
 567                                         <div class="method-source-code"
 568                                                 id="get-facts-source">
 569 <pre>
 570     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 71</span>
 571 71:       <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">get_facts</span>
 572 72:         <span class="ruby-identifier">get_fact</span>(<span class="ruby-keyword kw">nil</span>)
 573 73:       <span class="ruby-keyword kw">end</span></pre>
 574                                         </div>
 575
 576                                 </div>
 577
 578
 579                         </div>
 580
 581
 582                         <div id="has-fact--method" class="method-detail ">
 583                                 <a name="M000264"></a>
 584
 585                                 <div class="method-heading">
 586
 587                                         <span class="method-name">has_fact?</span><span
 588                                                 class="method-args">(fact)</span>
 589                                         <span class="method-click-advice">click to toggle source</span>
 590
 591                                 </div>
 592
 593                                 <div class="method-description">
 594
 595                                         <p>
 596 Returns true if we know about a specific fact, false otherwise
 597 </p>
 598
 599
 600
 601                                         <div class="method-source-code"
 602                                                 id="has-fact--source">
 603 <pre>
 604     <span class="ruby-comment cmt"># File lib/mcollective/facts/base.rb, line 76</span>
 605 76:       <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">has_fact?</span>(<span class="ruby-identifier">fact</span>)
 606 77:         <span class="ruby-identifier">get_fact</span>(<span class="ruby-keyword kw">nil</span>).<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">fact</span>)
 607 78:       <span class="ruby-keyword kw">end</span></pre>
 608                                         </div>
 609
 610                                 </div>
 611
 612
 613                         </div>
 614
 615
 616                 </div>
 617
 618
 619         </div>
 620
 621
 622         <div id="rdoc-debugging-section-dump" class="debugging-section">
 623
 624                 <p>Disabled; run with --debug to generate this.</p>
 625
 626         </div>
 627
 628         <div id="validator-badges">
 629                 <p><small><a href="http://validator.w3.org/check/referer">[Validate]</a></small></p>
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 632         </div>
 633
 634 </body>
 635 </html>
 636