add script to move moon chunks to center

utils/redisMoveCanvas.js

@@ -0,0 +1,38 @@
+/* @flow */
+// this script moves chunks of a canvas, i.e. to center it after changing size
+
+import redis from 'redis';
+import bluebird from 'bluebird';
+
+
+bluebird.promisifyAll(redis.RedisClient.prototype);
+bluebird.promisifyAll(redis.Multi.prototype);
+
+//ATTENTION Make suer to set the rdis URLs right!!!
+const url = "redis://localhost:6379";
+const redis = redis.createClient(url, { return_buffers: true });
+
+const CANVAS_SIZE = 4096;
+const TILE_SIZE = 256;
+const offset = (16384 - 4096) / 2 / 256;
+
+const CHUNKS_XY = CANVAS_SIZE / TILE_SIZE;
+
+async function move() {
+  for (let x = CHUNKS_XY - 1; x >= 0; x--) {
+    for (let y = CHUNKS_XY - 1; y >= 0; y--) {
+      const key = `ch:1:${x}:${y}`;
+      const chunk = await redis.getAsync(key);
+      if (chunk) {
+        const buffer = new Uint8Array(chunk);
+        const newKey = `ch:1:${x + offset}:${y + offset}`
+        await redis.setAsync(newKey, Buffer.from(buffer.buffer));
+        await redis.delAsync(key);
+        console.log('Moved Chunk ', key, ' to ', newKey);
+      }
+    }
+  }
+  console.log("done");
+}
+
+move();