Generate statistics every second

src/Peer.ts

@@ -30,6 +30,18 @@ export interface Peer extends Emitter {}
 
 export type RPCMethod = (...args: unknown[]) => unknown;
 
+interface IStatistics {
+    txTotal: number;
+    rxTotal: number;
+    txBytes: number;
+    rxBytes: number;
+    txRate: number;
+    rxRate: number;
+    txRequested: number;
+    txRatio: number;        // Requested over sent, should be close to 1
+    duration: number;
+};
+
 /**
  * Wrap a web socket with a MsgPack RCP protocol that works with our C++ version.
  * @param {websocket} ws Websocket object
@@ -45,7 +57,6 @@ export class Peer {
     callbacks = {};
     cbid = 0;
     server = false;
-    sendCount = 0;
 
     latency = 0;
 
@@ -54,12 +65,25 @@ export class Peer {
     master = false;
 
     txBytes = 0;
+    txRequested = 0;
     rxBytes = 0;
     lastStatsCall = Date.now();
-    lastStats = null;
+    lastStats: IStatistics = {
+        txTotal: 0,
+        rxTotal: 0,
+        txBytes: 0,
+        rxBytes: 0,
+        txRate: 0,
+        rxRate: 0,
+        txRequested: 0,
+        txRatio: 0,
+        duration: 0,
+    };
 
     static uuid: string;
 
+    static peers: Map<string, Peer> = new Map();
+
     constructor(ws?: WebSocketConnection, server = false) {
         this.sock = ws;
         this.server = server;
@@ -71,7 +95,7 @@ export class Peer {
                 raw = raw.data;
             }
 
-            this.rxBytes += raw.length || raw.byteLength;
+            this.rxBytes += raw.length || raw.byteLength || 0;
             const msg = decode(raw);
             // console.log('MSG', msg)
             if (this.status === kConnecting) {
@@ -97,6 +121,7 @@ export class Peer {
         const close = () => {
             this.emit("disconnect", this);
             this.status = kDisconnected;
+            Peer.removePeer(this);
         }
     
         const error = (e) => {
@@ -129,28 +154,39 @@ export class Peer {
     }
 
     getStatistics() {
+        return this.lastStats;
+    }
+
+    updateStatistics() {
         const time = Date.now();
-        if (time - this.lastStatsCall > 5000 || !this.lastStats) {
-        this.lastStats = [time - this.lastStatsCall, this.rxBytes, 0];
-        this.rxBytes = 0;
+        const duration = time - this.lastStatsCall;
+        if (duration < 10) return;
+        this.lastStats = {
+            txTotal: this.lastStats.txTotal + this.txBytes,
+            rxTotal: this.lastStats.rxTotal + this.rxBytes,
+            txBytes: this.txBytes,
+            rxBytes: this.rxBytes,
+            txRate: this.txBytes / duration,
+            rxRate: this.rxBytes / duration,
+            txRequested: this.txRequested,
+            txRatio: (this.txBytes > 0) ? this.txRequested / this.txBytes : 0.0,
+            duration,
+        };
         this.txBytes = 0;
+        this.rxBytes = 0;
+        this.txRequested = 0;
         this.lastStatsCall = time;
     }
-        return this.lastStats;
-    }
 
     sendHandshake() {
         this.send("__handshake__", kMagic, kVersion, [my_uuid]);
     }
 
-    isBuffering(): boolean {
-        return this.sendCount > 0;
-    }
-
     private _send(msg: Buffer | ReturnType<typeof encode>) {
-        ++this.sendCount;
+        const bytes = msg.length;
+        this.txRequested += bytes;
         this.sock.send(msg, () => {
-            --this.sendCount;
+            this.txBytes += bytes;
         });
     }
 
@@ -159,6 +195,7 @@ export class Peer {
             this.status = kConnected;
             this.id = id[0];
             this.string_id = id[0].toString('hex');
+            Peer.addPeer(this);
             if (!this.server) {
                 this.sendHandshake();
             }
@@ -319,6 +356,27 @@ export class Peer {
     getUuid(): string {
         return uuid;
     }
+
+    static interval?: NodeJS.Timer;
+
+    static addPeer(p: Peer) {
+        Peer.peers.set(p.string_id, p);
+        if (Peer.peers.size === 1) {
+            Peer.interval = setInterval(() => {
+                for (const [id, peer] of Peer.peers) {
+                    peer.updateStatistics();
+                }
+            }, 1000);
+        }
+    }
+
+    static removePeer(p: Peer) {
+        Peer.peers.delete(p.string_id);
+        if (Peer.peers.size === 0 && Peer.interval) {
+            clearInterval(Peer.interval);
+            Peer.interval = undefined;
+        }
+    }
 }		
 
 ee(Peer.prototype);

tests/peer.unit.test.ts

 import {Peer} from '../src/Peer';
 import WebSocket from 'ws';
 
+function wait(ms: number) {
+    return new Promise<void>((resolve) => setTimeout(resolve, ms));
+}
+
 describe("Peer class", () => {
     let clientPeer: Peer;
     let serverPeer: Peer;
@@ -91,4 +95,22 @@ describe("Peer class", () => {
 
         expect.assertions(3);
     });
+
+    it("can generate statistics", async () => {
+        expect(clientPeer).toBeTruthy();
+        expect(serverPeer).toBeTruthy();
+
+        await new Promise((resolve) => {
+            serverPeer.bind("test_rpc", (value) => {
+                expect(value).toBe(50);
+                resolve(true);
+            });
+    
+            clientPeer.send("test_rpc", 50);
+        });
+
+        await wait(2000);
+
+        expect(serverPeer.getStatistics().txTotal).toBeGreaterThan(0);
+    });
 });
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