Move setup step to #startWriting method.

lib/mbtiles.js

@@ -55,9 +55,6 @@ function MBTiles(uri, callback) {
     this._batchSize = +uri.query.batch;
     Step(function() {
         mbtiles._db = new sqlite3.Database(mbtiles.filename, this);
-    }, function(err) {
-        if (err) throw err;
-        mbtiles._setup(this);
     }, function(err) {
         if (err) throw err;
         fs.stat(mbtiles.filename, this);
@@ -389,18 +386,24 @@ MBTiles.prototype.startWriting = function(callback) {
     if (typeof callback !== 'function') throw new Error('Callback needed');
     if (!this.open) return callback(new Error('MBTiles not yet loaded'));
 
-    // Sets the synchronous flag to OFF for (much) faster inserts.
-    // See http://www.sqlite3.org/pragma.html#pragma_synchronous
-
     var mbtiles = this;
-    if (!this._isWritable) {
-        this._isWritable = 1;
-        this._clearCaches();
-        this._db.run('PRAGMA synchronous=OFF', callback);
-    } else {
-        this._isWritable++;
-        return callback(null);
-    }
+    Step(function() {
+        mbtiles._setup(this);
+    }, function(err) {
+        if (err) throw err;
+        // Sets the synchronous flag to OFF for (much) faster inserts.
+        // See http://www.sqlite3.org/pragma.html#pragma_synchronous
+        if (!mbtiles._isWritable) {
+            mbtiles._isWritable = 1;
+            mbtiles._clearCaches();
+            mbtiles._db.run('PRAGMA synchronous=OFF', this);
+        } else {
+            mbtiles._isWritable++;
+            this();
+        }
+    }, function(err) {
+        return callback(err);
+    });
 };
 
 MBTiles.prototype._clearCaches = function() {