refactor: block broadcast when block comes from forger

packages/core-blockchain/src/blockchain.ts

@@ -234,8 +234,8 @@ export class Blockchain implements blockchain.IBlockchain {
     /**
      * Push a block to the process queue.
      */
-    public handleIncomingBlock(block: Interfaces.IBlockData, remoteAddress: string): void {
-        this.pushPingBlock(block);
+    public handleIncomingBlock(block: Interfaces.IBlockData, remoteAddress: string, fromForger: boolean = false): void {
+        this.pushPingBlock(block, fromForger);
 
         logger.info(
             `Received new block at height ${block.height.toLocaleString()} with ${pluralize(
@@ -482,7 +482,7 @@ export class Blockchain implements blockchain.IBlockchain {
     /**
      * Push ping block.
      */
-    public pushPingBlock(block: Interfaces.IBlockData): void {
-        this.state.pushPingBlock(block);
+    public pushPingBlock(block: Interfaces.IBlockData, fromForger: boolean = false): void {
+        this.state.pushPingBlock(block, fromForger);
     }
 }

packages/core-blockchain/src/state-storage.ts

@@ -222,7 +222,7 @@ export class StateStorage implements Blockchain.IStateStorage {
     /**
      * Push ping block.
      */
-    public pushPingBlock(block: Interfaces.IBlockData): void {
+    public pushPingBlock(block: Interfaces.IBlockData, fromForger: boolean = false): void {
         // logging for stats about network health
         if (this.blockPing) {
             logger.info(
@@ -231,7 +231,7 @@ export class StateStorage implements Blockchain.IStateStorage {
         }
 
         this.blockPing = {
-            count: 1,
+            count: fromForger ? 0 : 1, // if block comes from forger, it hasn't "pinged" blockchain even once
             first: new Date().getTime(),
             last: new Date().getTime(),
             block,

packages/core-interfaces/src/core-blockchain/blockchain.ts

@@ -66,7 +66,7 @@ export interface IBlockchain {
     /**
      * Push a block to the process queue.
      */
-    handleIncomingBlock(block: Interfaces.IBlockData, remoteAddress: string): void;
+    handleIncomingBlock(block: Interfaces.IBlockData, remoteAddress: string, fromForger?: boolean): void;
 
     /**
      * Remove N number of blocks.
@@ -163,5 +163,5 @@ export interface IBlockchain {
      * Push ping block.
      * @return {Object}
      */
-    pushPingBlock(block: Interfaces.IBlockData): void;
+    pushPingBlock(block: Interfaces.IBlockData, fromForger?: boolean): void;
 }

packages/core-interfaces/src/core-blockchain/state-storage.ts

@@ -74,5 +74,5 @@ export interface IStateStorage {
     /**
      * Push ping block
      */
-    pushPingBlock(block: Interfaces.IBlockData): void;
+    pushPingBlock(block: Interfaces.IBlockData, fromForger?: boolean): void;
 }

packages/core-p2p/src/network-monitor.ts

@@ -310,9 +310,9 @@ export class NetworkMonitor implements P2P.INetworkMonitor {
             // wait a bit before broadcasting if a bit early
             const diff = blockPing.last - blockPing.first;
             const maxHop = 4;
-            let proba = (maxHop - blockPing.count) / maxHop;
+            let broadcastQuota: number = (maxHop - blockPing.count) / maxHop;
 
-            if (diff < 500 && proba > 0) {
+            if (diff < 500 && broadcastQuota > 0) {
                 await delay(500 - diff);
 
                 blockPing = blockchain.getBlockPing();
@@ -322,11 +322,11 @@ export class NetworkMonitor implements P2P.INetworkMonitor {
                     return;
                 }
 
-                proba = (maxHop - blockPing.count) / maxHop;
+                broadcastQuota = (maxHop - blockPing.count) / maxHop;
             }
 
-            // TODO: to be put in config?
-            peers = peers.filter(p => Math.random() < proba);
+            peers = broadcastQuota <= 0 ? [] : shuffle(peers).slice(0, Math.ceil(broadcastQuota * peers.length));
+            // select a portion of our peers according to quota calculated before
         }
 
         this.logger.info(

packages/core-p2p/src/socket-server/versions/peer.ts

@@ -63,8 +63,9 @@ export async function postBlock({ req }): Promise<void> {
     const blockchain: Blockchain.IBlockchain = app.resolvePlugin<Blockchain.IBlockchain>("blockchain");
 
     const block: Interfaces.IBlockData = req.data.block;
+    const fromForger: boolean = isWhitelisted(app.resolveOptions("p2p").remoteAccess, req.headers.remoteAddress);
 
-    if (!isWhitelisted(app.resolveOptions("p2p").remoteAccess, req.headers.remoteAddress)) {
+    if (!fromForger) {
         if (blockchain.pingBlock(block)) {
             return;
         }
@@ -76,7 +77,7 @@ export async function postBlock({ req }): Promise<void> {
         }
     }
 
-    blockchain.handleIncomingBlock(block, req.headers.remoteAddress);
+    blockchain.handleIncomingBlock(block, req.headers.remoteAddress, fromForger);
 }
 
 export async function postTransactions({ service, req }: { service: P2P.IPeerService; req }): Promise<string[]> {