Give Drydock resources a proper expiry mechanism

Summary:
Fixes T6569. This implements an expiry mechanism for Drydock resources which parallels the mechanism for leases.

A few things are missing that we'll probably need in the future:

  - An "EXPIRES" command to update the expiration time. This would let resources be permanent while leased, then expire after, say, 24 hours without any leases.
  - A callback like `shouldActuallyExpireRightNow()` for resources and leases that lets them decide not to expire at the last second.
  - A callback like `didAcquireLease()` for resource blueprints, to parallel `didReleaseLease()`, letting them clear or extend their timer.

However, this stuff would mostly just let us tune behaviors, not really open up new capabilities.

Test Plan: Changed host resources to expire after 60 seconds, leased one, saw it vanish 60 seconds later.

Reviewers: hach-que, chad

Reviewed By: chad

Maniphest Tasks: T6569

Differential Revision: https://secure.phabricator.com/D14176

resources/sql/autopatches/20150928.drydock.rexpire.1.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_drydock.drydock_resource
+  ADD until INT UNSIGNED;

src/applications/drydock/capability/DrydockDefaultViewCapability.php

@@ -8,4 +8,8 @@ final class DrydockDefaultViewCapability extends PhabricatorPolicyCapability {
     return pht('Default Blueprint View Policy');
   }
 
+  public function shouldAllowPublicPolicySetting() {
+    return true;
+  }
+
 }

src/applications/drydock/controller/DrydockConsoleController.php

@@ -15,7 +15,6 @@ final class DrydockConsoleController extends DrydockController {
     $nav->addFilter('blueprint', pht('Blueprints'));
     $nav->addFilter('resource', pht('Resources'));
     $nav->addFilter('lease', pht('Leases'));
-    $nav->addFilter('log', pht('Logs'));
 
     $nav->selectFilter(null);
 
@@ -31,6 +30,7 @@ final class DrydockConsoleController extends DrydockController {
     $menu->addItem(
       id(new PHUIObjectItemView())
         ->setHeader(pht('Blueprints'))
+        ->setFontIcon('fa-map-o')
         ->setHref($this->getApplicationURI('blueprint/'))
         ->addAttribute(
           pht(
@@ -40,6 +40,7 @@ final class DrydockConsoleController extends DrydockController {
     $menu->addItem(
       id(new PHUIObjectItemView())
         ->setHeader(pht('Resources'))
+        ->setFontIcon('fa-map')
         ->setHref($this->getApplicationURI('resource/'))
         ->addAttribute(
           pht('View and manage resources Drydock has built, like hosts.')));
@@ -47,16 +48,10 @@ final class DrydockConsoleController extends DrydockController {
     $menu->addItem(
       id(new PHUIObjectItemView())
         ->setHeader(pht('Leases'))
+        ->setFontIcon('fa-link')
         ->setHref($this->getApplicationURI('lease/'))
         ->addAttribute(pht('Manage leases on resources.')));
 
-    $menu->addItem(
-      id(new PHUIObjectItemView())
-        ->setHeader(pht('Logs'))
-        ->setHref($this->getApplicationURI('log/'))
-        ->addAttribute(pht('View logs.')));
-
-
     $crumbs = $this->buildApplicationCrumbs();
     $crumbs->addTextCrumb(pht('Console'));
 

src/applications/drydock/controller/DrydockResourceViewController.php

@@ -116,6 +116,14 @@ final class DrydockResourceViewController extends DrydockResourceController {
       pht('Status'),
       $status);
 
+    $until = $resource->getUntil();
+    if ($until) {
+      $until_display = phabricator_datetime($until, $viewer);
+    } else {
+      $until_display = phutil_tag('em', array(), pht('Never'));
+    }
+    $view->addProperty(pht('Expires'), $until_display);
+
     $view->addProperty(
       pht('Resource Type'),
       $resource->getType());

src/applications/drydock/storage/DrydockLease.php

@@ -295,6 +295,15 @@ final class DrydockLease extends DrydockDAO
     }
   }
 
+  public function canUpdate() {
+    switch ($this->getStatus()) {
+      case DrydockLeaseStatus::STATUS_ACTIVE:
+        return true;
+      default:
+        return false;
+    }
+  }
+
   public function scheduleUpdate($epoch = null) {
     PhabricatorWorker::scheduleTask(
       'DrydockLeaseUpdateWorker',

src/applications/drydock/storage/DrydockResource.php

@@ -7,6 +7,7 @@ final class DrydockResource extends DrydockDAO
   protected $phid;
   protected $blueprintPHID;
   protected $status;
+  protected $until;
 
   protected $type;
   protected $name;
@@ -32,6 +33,7 @@ final class DrydockResource extends DrydockDAO
         'ownerPHID' => 'phid?',
         'status' => 'text32',
         'type' => 'text64',
+        'until' => 'epoch?',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'key_type' => array(
@@ -126,6 +128,10 @@ final class DrydockResource extends DrydockDAO
 
     $this->isAllocated = true;
 
+    if ($new_status == DrydockResourceStatus::STATUS_ACTIVE) {
+      $this->didActivate();
+    }
+
     return $this;
   }
 
@@ -164,6 +170,8 @@ final class DrydockResource extends DrydockDAO
 
     $this->isActivated = true;
 
+    $this->didActivate();
+
     return $this;
   }
 
@@ -181,14 +189,16 @@ final class DrydockResource extends DrydockDAO
     }
   }
 
-  public function scheduleUpdate() {
+  public function scheduleUpdate($epoch = null) {
     PhabricatorWorker::scheduleTask(
       'DrydockResourceUpdateWorker',
       array(
         'resourcePHID' => $this->getPHID(),
+        'isExpireTask' => ($epoch !== null),
       ),
       array(
         'objectPHID' => $this->getPHID(),
+        'delayUntil' => $epoch,
       ));
   }
 
@@ -209,6 +219,20 @@ final class DrydockResource extends DrydockDAO
     if ($need_update) {
       $this->scheduleUpdate();
     }
+
+    $expires = $this->getUntil();
+    if ($expires) {
+      $this->scheduleUpdate($expires);
+    }
+  }
+
+  public function canUpdate() {
+    switch ($this->getStatus()) {
+      case DrydockResourceStatus::STATUS_ACTIVE:
+        return true;
+      default:
+        return false;
+    }
   }
 
 

src/applications/drydock/worker/DrydockLeaseUpdateWorker.php

@@ -23,31 +23,15 @@ final class DrydockLeaseUpdateWorker extends DrydockWorker {
   }
 
   private function updateLease(DrydockLease $lease) {
-    if ($lease->getStatus() != DrydockLeaseStatus::STATUS_ACTIVE) {
+    if (!$lease->canUpdate()) {
       return;
     }
 
-    $viewer = $this->getViewer();
-    $drydock_phid = id(new PhabricatorDrydockApplication())->getPHID();
-
-    // Check if the lease has expired. If it is, we're going to send it a
-    // release command. This command will be handled immediately below, it
-    // just generates a command log and improves consistency.
-    $now = PhabricatorTime::getNow();
-    $expires = $lease->getUntil();
-    if ($expires && ($expires <= $now)) {
-      $command = DrydockCommand::initializeNewCommand($viewer)
-        ->setTargetPHID($lease->getPHID())
-        ->setAuthorPHID($drydock_phid)
-        ->setCommand(DrydockCommand::COMMAND_RELEASE)
-        ->save();
-    }
+    $this->checkLeaseExpiration($lease);
 
     $commands = $this->loadCommands($lease->getPHID());
     foreach ($commands as $command) {
-      if ($lease->getStatus() != DrydockLeaseStatus::STATUS_ACTIVE) {
-        // Leases can't receive commands before they activate or after they
-        // release.
+      if (!$lease->canUpdate()) {
         break;
       }
 
@@ -58,15 +42,7 @@ final class DrydockLeaseUpdateWorker extends DrydockWorker {
         ->save();
     }
 
-    // If this is the task which will eventually release the lease after it
-    // expires but it is still active, reschedule the task to run after the
-    // lease expires. This can happen if the lease's expiration was pushed
-    // forward.
-    if ($lease->getStatus() == DrydockLeaseStatus::STATUS_ACTIVE) {
-      if ($this->getTaskDataValue('isExpireTask') && $expires) {
-        throw new PhabricatorWorkerYieldException($expires - $now);
-      }
-    }
+    $this->yieldIfExpiringLease($lease);
   }
 
   private function processCommand(

src/applications/drydock/worker/DrydockResourceUpdateWorker.php

@@ -11,18 +11,27 @@ final class DrydockResourceUpdateWorker extends DrydockWorker {
     $lock = PhabricatorGlobalLock::newLock($lock_key)
       ->lock(1);
 
-    $resource = $this->loadResource($resource_phid);
-    $this->updateResource($resource);
+    try {
+      $resource = $this->loadResource($resource_phid);
+      $this->updateResource($resource);
+    } catch (Exception $ex) {
+      $lock->unlock();
+      throw $ex;
+    }
 
     $lock->unlock();
   }
 
   private function updateResource(DrydockResource $resource) {
+    if (!$resource->canUpdate()) {
+      return;
+    }
+
+    $this->checkResourceExpiration($resource);
+
     $commands = $this->loadCommands($resource->getPHID());
     foreach ($commands as $command) {
-      if ($resource->getStatus() != DrydockResourceStatus::STATUS_ACTIVE) {
-        // Resources can't receive commands before they activate or after they
-        // release.
+      if (!$resource->canUpdate()) {
         break;
       }
 
@@ -32,6 +41,8 @@ final class DrydockResourceUpdateWorker extends DrydockWorker {
         ->setIsConsumed(true)
         ->save();
     }
+
+    $this->yieldIfExpiringResource($resource);
   }
 
   private function processCommand(

src/applications/drydock/worker/DrydockWorker.php

@@ -50,4 +50,68 @@ abstract class DrydockWorker extends PhabricatorWorker {
     return $commands;
   }
 
+  protected function checkLeaseExpiration(DrydockLease $lease) {
+    $this->checkObjectExpiration($lease);
+  }
+
+  protected function checkResourceExpiration(DrydockResource $resource) {
+    $this->checkObjectExpiration($resource);
+  }
+
+  private function checkObjectExpiration($object) {
+    // Check if the resource or lease has expired. If it has, we're going to
+    // send it a release command.
+
+    // This command is sent from within the update worker so it is handled
+    // immediately, but doing this generates a log and improves consistency.
+
+    $expires = $object->getUntil();
+    if (!$expires) {
+      return;
+    }
+
+    $now = PhabricatorTime::getNow();
+    if ($expires > $now) {
+      return;
+    }
+
+    $viewer = $this->getViewer();
+    $drydock_phid = id(new PhabricatorDrydockApplication())->getPHID();
+
+    $command = DrydockCommand::initializeNewCommand($viewer)
+      ->setTargetPHID($object->getPHID())
+      ->setAuthorPHID($drydock_phid)
+      ->setCommand(DrydockCommand::COMMAND_RELEASE)
+      ->save();
+  }
+
+  protected function yieldIfExpiringLease(DrydockLease $lease) {
+    if (!$lease->canUpdate()) {
+      return;
+    }
+
+    $this->yieldIfExpiring($lease->getUntil());
+  }
+
+  protected function yieldIfExpiringResource(DrydockResource $resource) {
+    if (!$resource->canUpdate()) {
+      return;
+    }
+
+    $this->yieldIfExpiring($resource->getUntil());
+  }
+
+  private function yieldIfExpiring($expires) {
+    if (!$expires) {
+      return;
+    }
+
+    if (!$this->getTaskDataValue('isExpireTask')) {
+      return;
+    }
+
+    $now = PhabricatorTime::getNow();
+    throw new PhabricatorWorkerYieldException($expires - $now);
+  }
+
 }

src/infrastructure/daemon/workers/management/PhabricatorWorkerManagementWorkflow.php

@@ -39,6 +39,13 @@ abstract class PhabricatorWorkerManagementWorkflow
       }
     }
 
+    // When we lock tasks properly, this gets populated as a side effect. Just
+    // fake it when doing manual CLI stuff. This makes sure CLI yields have
+    // their expires times set properly.
+    foreach ($tasks as $task) {
+      $task->setServerTime(PhabricatorTime::getNow());
+    }
+
     return $tasks;
   }