Make caches misses throw by default intead of inline-generating

Summary:
Ref T4103. Ref T10078. Currently, when a user misses a cache we just build it for them.

This is the behavior we want for the the viewer (so we don't have to build every cache up front if we don't actually need them), but not the right behavior for other users (since it allows performance problems to go undetected).

Make inline cache generation strict by default, then make sure all the things that rely on cache data request the correct data (well, all of the things identified by unit tests, at least: there might be some more stuff I haven't hit yet).

This fixes test failures in D16040, and backports a piece of that change.

Test Plan: Identified and then fixed failures with `arc unit --everything`.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4103, T10078

Differential Revision: https://secure.phabricator.com/D16042

src/applications/auth/engine/PhabricatorAuthSessionEngine.php

@@ -163,6 +163,7 @@ final class PhabricatorAuthSessionEngine extends Phobject {
     $user = $user_table->loadFromArray($info);
 
     $user->attachRawCacheData($cache_raw);
+    $user->setAllowInlineCacheGeneration(true);
 
     switch ($session_type) {
       case PhabricatorAuthSession::TYPE_WEB:

src/applications/metamta/query/PhabricatorMetaMTAActorQuery.php

@@ -59,6 +59,7 @@ final class PhabricatorMetaMTAActorQuery extends PhabricatorQuery {
     $users = id(new PhabricatorPeopleQuery())
       ->setViewer($this->getViewer())
       ->withPHIDs($phids)
+      ->needUserSettings(true)
       ->execute();
     $users = mpull($users, null, 'getPHID');
 

src/applications/metamta/replyhandler/PhabricatorMailReplyHandler.php

@@ -337,9 +337,12 @@ abstract class PhabricatorMailReplyHandler extends Phobject {
 
     $all_phids = array_merge($to, $cc);
     if ($all_phids) {
+      // We need user settings here because we'll check translations later
+      // when generating mail.
       $users = id(new PhabricatorPeopleQuery())
         ->setViewer(PhabricatorUser::getOmnipotentUser())
         ->withPHIDs($all_phids)
+        ->needUserSettings(true)
         ->execute();
       $users = mpull($users, null, 'getPHID');
 

src/applications/people/query/PhabricatorPeopleQuery.php

@@ -528,9 +528,6 @@ final class PhabricatorPeopleQuery
     $cache_data = igroup($cache_data, 'userPHID');
     foreach ($user_map as $user_phid => $user) {
       $raw_rows = idx($cache_data, $user_phid, array());
-      if (!$raw_rows) {
-        continue;
-      }
       $raw_data = ipull($raw_rows, 'cacheData', 'cacheKey');
 
       foreach ($keys as $key) {

src/applications/people/storage/PhabricatorUser.php

@@ -65,6 +65,7 @@ final class PhabricatorUser
 
   private $settingCacheKeys = array();
   private $settingCache = array();
+  private $allowInlineCacheGeneration;
 
   protected function readField($field) {
     switch ($field) {
@@ -483,7 +484,11 @@ final class PhabricatorUser
     }
 
     $settings_key = PhabricatorUserPreferencesCacheType::KEY_PREFERENCES;
+    if ($this->getPHID()) {
       $settings = $this->requireCacheData($settings_key);
+    } else {
+      $settings = array();
+    }
 
     $defaults = PhabricatorSetting::getAllEnabledSettings($this);
 
@@ -1486,6 +1491,10 @@ final class PhabricatorUser
     return $this;
   }
 
+  public function setAllowInlineCacheGeneration($allow_cache_generation) {
+    $this->allowInlineCacheGeneration = $allow_cache_generation;
+    return $this;
+  }
 
   /**
    * @task cache
@@ -1506,6 +1515,12 @@ final class PhabricatorUser
       return $usable_value;
     }
 
+    // By default, we throw if a cache isn't available. This is consistent
+    // with the standard `needX()` + `attachX()` + `getX()` interaction.
+    if (!$this->allowInlineCacheGeneration) {
+      throw new PhabricatorDataNotAttachedException($this);
+    }
+
     $usable_value = $type->getDefaultValue();
 
     $user_phid = $this->getPHID();

src/infrastructure/testing/PhabricatorTestCase.php

@@ -202,6 +202,14 @@ abstract class PhabricatorTestCase extends PhutilTestCase {
     $editor->setActor($user);
     $editor->createNewUser($user, $email);
 
+    // When creating a new test user, we prefill their setting cache as empty.
+    // This is a little more efficient than doing a query to load the empty
+    // settings.
+    $user->attachRawCacheData(
+      array(
+        PhabricatorUserPreferencesCacheType::KEY_PREFERENCES => '[]',
+      ));
+
     return $user;
   }