Migrate revision storage to modern status constants ("accepted") instead of legacy numeric values ("2")

Summary:
Ref T2543. Rewrites all the storage to use constants.

Note that transactions still use legacy values, I'll migrate and update them separately.

Test Plan:
  - Ran migration.
  - Browsed around, changed revision states, viewed dashboard, etc.
  - Selected `DISTINCT()` and `GROUP_CONCAT()` of the `status` field in the database, saw sane/expected before and after values.
  - Verified that old Conduit methods still return numeric constants for compatibility.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T2543

Differential Revision: https://secure.phabricator.com/D18418

resources/sql/autopatches/20170811.differential.02.modernstatus.sql

@@ -0,0 +1,17 @@
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "needs-review" WHERE status = "0";
+
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "needs-revision" WHERE status = "1";
+
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "accepted" WHERE status = "2";
+
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "published" WHERE status = "3";
+
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "abandoned" WHERE status = "4";
+
+UPDATE {$NAMESPACE}_differential.differential_revision
+  SET status = "changes-planned" WHERE status = "5";

src/applications/differential/constants/DifferentialLegacyQuery.php

@@ -31,21 +31,6 @@ final class DifferentialLegacyQuery
     return $map[$status];
   }
 
-  public static function getLegacyValues(array $modern_values) {
-    $values = array();
-    foreach ($modern_values as $status_constant) {
-      $status_object = DifferentialRevisionStatus::newForStatus(
-        $status_constant);
-
-      $legacy_key = $status_object->getLegacyKey();
-      if ($legacy_key !== null) {
-        $values[] = $legacy_key;
-      }
-    }
-
-    return $values;
-  }
-
   private static function getMap() {
     $all = array(
       DifferentialRevisionStatus::NEEDS_REVIEW,

src/applications/differential/query/DifferentialRevisionQuery.php

@@ -695,7 +695,7 @@ final class DifferentialRevisionQuery
       $where[] = qsprintf(
         $conn_r,
         'r.status in (%Ls)',
-        DifferentialLegacyQuery::getLegacyValues($this->statuses));
+        $this->statuses);
     }
 
     if ($this->isOpen !== null) {
@@ -709,7 +709,7 @@ final class DifferentialRevisionQuery
       $where[] = qsprintf(
         $conn_r,
         'r.status in (%Ls)',
-        DifferentialLegacyQuery::getLegacyValues($statuses));
+        $statuses);
     }
 
     $where[] = $this->buildWhereClauseParts($conn_r);

src/applications/differential/storage/DifferentialRevision.php

@@ -613,26 +613,15 @@ final class DifferentialRevision extends DifferentialDAO
   }
 
   public function setModernRevisionStatus($status) {
-    $status_object = DifferentialRevisionStatus::newForStatus($status);
-
-    if ($status_object->getKey() != $status) {
-      throw new Exception(
-        pht(
-          'Trying to set revision to invalid status "%s".',
-          $status));
-    }
-
-    $legacy_status = $status_object->getLegacyKey();
-
-    return $this->setStatus($legacy_status);
+    return $this->setStatus($status);
   }
 
   public function getModernRevisionStatus() {
-    return $this->getStatusObject()->getKey();
+    return $this->getStatus();
   }
 
   public function getLegacyRevisionStatus() {
-    return $this->getStatus();
+    return $this->getStatusObject()->getLegacyKey();
   }
 
   public function isClosed() {
@@ -677,7 +666,7 @@ final class DifferentialRevision extends DifferentialDAO
 
   public function getStatusObject() {
     $status = $this->getStatus();
-    return DifferentialRevisionStatus::newForLegacyStatus($status);
+    return DifferentialRevisionStatus::newForStatus($status);
   }
 
   public function getFlag(PhabricatorUser $viewer) {

src/applications/differential/xaction/DifferentialRevisionStatusTransaction.php

@@ -14,8 +14,7 @@ final class DifferentialRevisionStatusTransaction
   }
 
   public function getTitle() {
-    $new = $this->getNewValue();
-    $status = DifferentialRevisionStatus::newForLegacyStatus($new);
+    $status = $this->newStatusObject();
 
     if ($status->isAccepted()) {
       return pht('This revision is now accepted and ready to land.');