Initial commit

Packets/packet.js

@@ -0,0 +1,55 @@
+const cache = {};
+
+const opcodesInterestedIn = {
+  //  200: true, // ammunition change
+    164: true, // item usage
+    163: true, // gets attacked
+    162: true, // authorless hp change
+    160: true, // design change
+    151: true, // map change state
+    148: true, // equipment change
+    131: true, // rewards
+    133: true, // entity disappears
+    134: true // entity appears
+};
+
+function packet(packetsToAdd, batched, id, metadataToAdd) {
+    if (!(packetsToAdd instanceof Array)) packetsToAdd = [packetsToAdd];
+    
+    if (!cache[id]) cache[id] = new ArrayBuffer(1024, { maxByteLength: 65536 });
+
+    const playerBehaviourContext = global.actionContext.getElement(id);
+
+    const targetBuffer = cache[id];
+    const targetArray = new Uint8Array(targetBuffer);
+    let offset = batched.offset;
+
+    packetsToAdd.forEach((packet, i) => {
+        const newSize = offset + packet.byteLength;
+        if (newSize > targetBuffer.byteLength) {
+            const newBufferSize = Math.pow(2, Math.ceil(Math.log(newSize) / Math.log(2)));
+            targetBuffer.resize(newBufferSize);
+        };
+
+        const newArray = new Uint8Array(packet);
+        if (opcodesInterestedIn[newArray[0]]) {
+            const metadata = {
+                ts: new Date(),
+                pid: id,
+                metadata: metadataToAdd && metadataToAdd[i] ? metadataToAdd[i] : {}
+            };
+        
+            playerBehaviourContext.add(metadata);
+        };
+
+        targetArray.set(newArray, offset);
+        offset += packet.byteLength;
+    });
+
+    return {
+        packet: targetBuffer,
+        offset
+    };
+};
+
+module.exports = packet;