ZP-1054 Throw UnavailableException if the hash cannot be loaded.

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/sqlstatemachine/sqlstatemachine.php

@@ -143,7 +143,7 @@ class SqlStateMachine implements IStateMachine {
      *
      * @access public
      * @return string
-     * @throws StateNotFoundException, StateInvalidException
+     * @throws StateNotFoundException, StateInvalidException, UnavailableException
      */
     public function GetStateHash($devid, $type, $key = null, $counter = false) {
         $hash = null;
@@ -155,8 +155,12 @@ class SqlStateMachine implements IStateMachine {
 
             $record = $sth->fetch(PDO::FETCH_ASSOC);
             if (!$record) {
+                $errCode = $sth->errorCode();
                 $this->clearConnection($this->dbh, $sth, $record);
-                throw new StateNotFoundException("SqlStateMachine->GetStateHash(): Could not locate state");
+                if ($errCode == 'HY000') {
+                    throw new UnavailableException("SqlStateMachine->GetStateHash(): Database not available", $errCode, null, LOGLEVEL_WARN);
+                }
+                throw new StateNotFoundException("SqlStateMachine->GetStateHash(): Could not locate state with error code: ". $errCode);
             }
             else {
                 // datetime->format("U") returns EPOCH

src/lib/core/devicemanager.php

@@ -1001,6 +1001,13 @@ class DeviceManager {
         catch (StateNotFoundException $snfex) {
             $this->hierarchySyncRequired = true;
         }
+        catch (UnavailableException $uaex) {
+            // This is temporary and can be ignored e.g. in PING - see https://jira.z-hub.io/browse/ZP-1054
+            // If the hash was not available before we treat it like a StateNotFoundException.
+            if ($this->deviceHash === false) {
+                $this->hierarchySyncRequired = true;
+            }
+        }
         return true;
     }
 

src/lib/default/filestatemachine.php

@@ -92,7 +92,7 @@ class FileStateMachine implements IStateMachine {
      *
      * @access public
      * @return string
-     * @throws StateNotFoundException, StateInvalidException
+     * @throws StateNotFoundException, StateInvalidException, UnavailableException
      */
     public function GetStateHash($devid, $type, $key = false, $counter = false) {
         $filename = $this->getFullFilePath($devid, $type, $key, $counter);

src/lib/interface/istatemachine.php

@@ -82,7 +82,7 @@ interface IStateMachine {
      *
      * @access public
      * @return string
-     * @throws StateNotFoundException, StateInvalidException
+     * @throws StateNotFoundException, StateInvalidException, UnavailableException
      */
     public function GetStateHash($devid, $type, $key = false, $counter = false);