support for default database identifier

Author: hafael

src/LaraFlake.php

@@ -7,6 +7,10 @@
 class LaraFlake
 {
 
+    const INITIAL_EPOCH = 1451625443000;
+
+    const DEFAULT_SHARD_ID = 1;
+
     /**
      * Generate the 64bit unique ID.
      * @return number BIGINT
@@ -19,10 +23,14 @@ public static function generateID()
 		*/
         $curr_timestamp = floor(microtime(true) * 1000);
 
+        if ( ! is_int(config('laraflake.initial_epoch', self::INITIAL_EPOCH)) ) {
+            throw new \InvalidArgumentException('Initial epoch is invalid. Must be an integer');
+        }
+
         /**
         * Subtract custom epoch from current time
         */
-        $curr_timestamp -= config('laraflake.initial_epoch');
+        $curr_timestamp -= config('laraflake.initial_epoch', self::INITIAL_EPOCH);
 
         /**
         * Create a initial base for ID
@@ -33,6 +41,13 @@ public static function generateID()
         * Get ID of database server (10 bits)
         * Up to 512 machines
         */
+
+        $node = self::getServerShardId();
+
+        if ( ! is_int($node) || $node < 0 || $node > 1023 ) {
+            throw new \InvalidArgumentException('The Shard ID identifier must be a 10 bit integer between 0 and 1023.');
+        }
+
         $shard_id = decbin(pow(2,9) - 1 + self::getServerShardId());
 
         /**
@@ -59,6 +74,11 @@ public static function generateID()
      */
     private static function getServerShardId()
     {
+
+        if(config('laraflake.provider', 'local') !== 'database'){
+            return config('laraflake.shard_id', self::DEFAULT_SHARD_ID);
+        }
+
         try {
             $database_name = DB::getName();
         }catch (\PDOException $e){
@@ -90,6 +110,6 @@ private static function getMySqlServerId()
      */
     public static function getTimeFromID($id)
     {
-        return bindec(substr(decbin($id),0,41)) - pow(2,40) + 1 + config('laraflake.initial_epoch');
+        return bindec(substr(decbin($id),0,41)) - pow(2,40) + 1 + config('laraflake.initial_epoch', self::INITIAL_EPOCH);
     }
 }

src/config/laraflake.php

@@ -14,4 +14,27 @@
     */
     'initial_epoch' => env('INITIAL_EPOCH', 1451625443000),
 
+    /*
+    |--------------------------------------------------------------------------
+    | Provider
+    |--------------------------------------------------------------------------
+    |
+    | The provider informs which driver will be used to obtain the database
+    | node identification.
+    | Available: "local" and "database".
+    |
+    */
+    'provider' => env('LARAFLAKE_PROVIDER', 'local'),
+
+    /*
+    |--------------------------------------------------------------------------
+    | Shard ID
+    |--------------------------------------------------------------------------
+    |
+    | The shard id is the identifier of the node used when the provider is
+    | local.
+    |
+    */
+    'shard_id' => env('LARAFLAKE_SHARD_ID', 1),
+
 ];