Aggiungi override probe TCP keepalive

red/tcp/tcp-keepalive.js

@@ -0,0 +1,41 @@
+"use strict";
+
+let native = null;
+
+try {
+    native = require("../../native/tcp_keepalive/build/Release/tcp_keepalive_native");
+} catch (err) {
+    native = null;
+}
+
+function parseKeepAliveProbes(value) {
+    if (value === undefined || value === null || value === "") {
+        return 0;
+    }
+
+    value = Number(value);
+    if (!Number.isFinite(value) || value < 0) {
+        return 0;
+    }
+
+    return Math.floor(value);
+}
+
+function setKeepAliveProbes(socket, probes) {
+    if (!native || probes <= 0 || !socket || !socket._handle) {
+        return false;
+    }
+
+    const fd = socket._handle.fd;
+    if (!Number.isInteger(fd) || fd < 0) {
+        return false;
+    }
+
+    return native.setKeepAliveProbes(fd, probes) === true;
+}
+
+module.exports = {
+    available: !!native,
+    parseKeepAliveProbes,
+    setKeepAliveProbes
+};

red/tcp/tcp.html

@@ -44,6 +44,10 @@
         <label><i class="fa fa-clock-o"></i> <span>Keepalive</span></label>
         <input type="text" id="node-input-keepalive" style="text-align:end; width:200px !important">
     </div>
+    <div class="form-row">
+        <label><i class="fa fa-times-circle"></i> <span>Missed keepalives</span></label>
+        <input type="text" id="node-input-keepaliveProbes" style="text-align:end; width:120px !important">
+    </div>
 
     <div id="node-row-newline" class="form-row hidden" style="padding-left:110px;">
         <span data-i18n="tcpin.label.delimited"></span> <input type="text" id="node-input-newline" style="width:110px;">
@@ -72,6 +76,7 @@
             datatype: { value: "buffer" },
             newline: { value: "" },
             keepalive: { value: "120000" },
+            keepaliveProbes: { value: "0" },
             topic: { value: "" },
             base64: {/*deprecated*/ value: false, required: true }
         },
@@ -109,6 +114,7 @@
             $("#node-input-datatype").change(updateOptions);
             $("#node-input-datamode").change(updateOptions);
             $("#node-input-keepalive").spinner({ min: 1 });
+            $("#node-input-keepaliveProbes").spinner({ min: 0 });
         }
     });
 </script>

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;