Aggiungi override probe TCP keepalive

red/tcp/tcp.js

@@ -19,6 +19,7 @@ module.exports = function(RED) {
     var reconnectTime = RED.settings.socketReconnectTime||10000;
     const msgQueueSize = RED.settings.tcpMsgQueueSize || 1000;
     const Denque = require('denque');
+    const tcpKeepAlive = require('./tcp-keepalive');
     var net = require('net');
 
     var connectionPool = {};
@@ -45,6 +46,14 @@ module.exports = function(RED) {
      */
     const dequeue = queue => queue.shift();
 
+    function setKeepAlive(socket, delay, probes, node) {
+        socket.setKeepAlive(true, delay);
+        if (probes > 0 && !tcpKeepAlive.setKeepAliveProbes(socket, probes) && !node.keepaliveProbesWarned) {
+            node.keepaliveProbesWarned = true;
+            node.warn("TCP keepalive probe count override is not available on this platform/runtime");
+        }
+    }
+
     function TcpIn(n) {
         RED.nodes.createNode(this,n);
         this.host = n.host;
@@ -55,6 +64,7 @@ module.exports = function(RED) {
         this.newline = (n.newline||"").replace("\\n","\n").replace("\\r","\r");
         this.base64 = n.base64;
         this.keepalive = parseInt(n.keepalive) || 120000;
+        this.keepaliveProbes = tcpKeepAlive.parseKeepAliveProbes(n.keepaliveProbes);
         this.server = (typeof n.server == 'boolean')?n.server:(n.server == "server");
         this.closing = false;
         this.connected = false;
@@ -76,7 +86,7 @@ module.exports = function(RED) {
                     node.log(RED._("tcpin.status.connected",{host:node.host,port:node.port}));
                     node.status({fill:"green",shape:"dot",text:"common.status.connected"});
                 });
-                client.setKeepAlive(true, node.keepalive);
+                setKeepAlive(client, node.keepalive, node.keepaliveProbes, node);
                 connectionPool[id] = client;
 
                 client.on('data', function (data) {
@@ -151,7 +161,7 @@ module.exports = function(RED) {
         }
         else {
             var server = net.createServer(function (socket) {
-                socket.setKeepAlive(true, node.keepalive);
+                setKeepAlive(socket, node.keepalive, node.keepaliveProbes, node);
                 var id = (1+Math.random()*4294967295).toString(16);
                 var fromi;
                 var fromp;