In Harbormaster, record byte length on the build logs

Summary: Depends on D19135. Ref T13088. Denormalize the total log size onto the log itself. This makes reasoning about the log at display time easier, and we don't need to fish around in the database as much to figure out what we're dealing with.

Test Plan: Ran `bin/harbormaster rebuild-log`, saw an existing log populate. Ran `bin/harbormaster write-log`, saw new log write with proper length information.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13088

Differential Revision: https://secure.phabricator.com/D19136

resources/sql/autopatches/20180223.log.01.bytelength.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_harbormaster.harbormaster_buildlog
+  ADD byteLength BIGINT UNSIGNED NOT NULL;

src/applications/harbormaster/storage/build/HarbormasterBuildLog.php

@@ -12,6 +12,7 @@ final class HarbormasterBuildLog
   protected $duration;
   protected $live;
   protected $filePHID;
+  protected $byteLength;
 
   private $buildTarget = self::ATTACHABLE;
   private $rope;
@@ -42,7 +43,8 @@ final class HarbormasterBuildLog
     return id(new HarbormasterBuildLog())
       ->setBuildTargetPHID($build_target->getPHID())
       ->setDuration(null)
-      ->setLive(1);
+      ->setLive(1)
+      ->setByteLength(0);
   }
 
   public function scheduleRebuild($force) {
@@ -70,6 +72,7 @@ final class HarbormasterBuildLog
 
         'live' => 'bool',
         'filePHID' => 'phid?',
+        'byteLength' => 'uint64',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'key_buildtarget' => array(
@@ -341,6 +344,7 @@ final class HarbormasterBuildLog
       $append_data = $rope->getPrefixBytes($data_limit);
       $data_size = strlen($append_data);
 
+      $this->openTransaction();
         if ($append_id) {
           queryfx(
             $conn_w,
@@ -353,12 +357,15 @@ final class HarbormasterBuildLog
           $this->writeChunk($encoding_text, $data_size, $append_data);
         }
 
+        $this->byteLength += $data_size;
+        $this->save();
+      $this->saveTransaction();
+
       $rope->removeBytesFromHead($data_size);
     }
   }
 
 
-
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 
 

src/applications/harbormaster/worker/HarbormasterLogWorker.php

@@ -57,6 +57,19 @@ final class HarbormasterLogWorker extends HarbormasterWorker {
     $data = $this->getTaskData();
     $is_force = idx($data, 'force');
 
+    if (!$log->getByteLength() || $is_force) {
+      $iterator = $log->newChunkIterator()
+        ->setAsString(true);
+
+      $byte_length = 0;
+      foreach ($iterator as $block) {
+        $byte_length += strlen($block);
+      }
+      $log
+        ->setByteLength($byte_length)
+        ->save();
+    }
+
     if ($log->canCompressLog()) {
       $log->compressLog();
     }