adding timeout attribute to function node

- [x] New feature (non-breaking change which adds functionality)

Discussion here:
https://discourse.nodered.org/t/function-node-doesnt-have-timeout-feature/78483

## Proposed changes

Adding a timeout attribute to the function node, so an endless funciton doesnt break the node red server.

## Checklist

- [x] I have read the [contribution guidelines](https://github.com/node-red/node-red/blob/master/CONTRIBUTING.md)
- [x] For non-bugfix PRs, I have discussed this change on the forum/slack team.
- [x] I have run `grunt` to verify the unit tests pass
- [x] I have added suitable unit tests to cover the new/changed functionality

packages/node_modules/@node-red/nodes/core/function/10-function.html

@@ -82,6 +82,11 @@
                 <input id="node-input-outputs" style="width: 60px;" value="1">
             </div>
 
+            <div class="form-row">
+                <label for="node-input-timeout"><i class="fa fa-clock"></i> <span data-i18n="function.label.timeout"></span></label>
+                <input id="node-input-timeout" style="width: 60px;" value="1000">
+            </div>
+
             <div class="form-row node-input-libs-row hide" style="margin-bottom: 0px;">
                 <label><i class="fa fa-cubes"></i> <span data-i18n="function.label.modules"></span></label>
             </div>
@@ -360,6 +365,7 @@
             name: {value:"_DEFAULT_"},
             func: {value:"\nreturn msg;"},
             outputs: {value:1},
+            timeout:{value:0},
             noerr: {value:0,required:true,
                     validate: function(v, opt) {
                         if (!v) {
@@ -464,6 +470,26 @@
                 }
             });
 
+            // 4294967295 is max in node.js timeout.
+            $( "#node-input-timeout" ).spinner({
+                min: 0,
+                max: 4294967294,
+                change: function(event, ui) {
+                    var value = this.value;
+                    if(value == ""){
+                        value = 0;
+                    }
+                    else
+                    {
+                        value = parseInt(value);
+                    }
+                    value = isNaN(value) ? 1 : value;
+                    value = Math.max(value, parseInt($(this).attr("aria-valuemin")));
+                    value = Math.min(value, parseInt($(this).attr("aria-valuemax")));
+                    if (value !== this.value) { $(this).spinner("value", value); }
+                }
+            });
+
             var buildEditor = function(id, stateId, focus, value, defaultValue, extraLibs, offset) {
                 var editor = RED.editor.createEditor({
                     id: id,
@@ -503,7 +529,7 @@
                 editor:this.editor, // the field name the main text body goes to
                 mode:"ace/mode/nrjavascript",
                 fields:[
-                    'name', 'outputs',
+                    'name', 'outputs', 'timeout',
                     {
                         name: 'initialize',
                         get: function() {

packages/node_modules/@node-red/nodes/core/function/10-function.js

@@ -96,6 +96,13 @@ module.exports = function(RED) {
         node.name = n.name;
         node.func = n.func;
         node.outputs = n.outputs;
+        node.timeout = n.timeout*1;
+        if(node.timeout>0){
+            node.timeoutOptions = {
+                timeout:node.timeout,
+                breakOnSigint:true
+            }
+        }
         node.ini = n.initialize ? n.initialize.trim() : "";
         node.fin = n.finalize ? n.finalize.trim() : "";
         node.libs = n.libs || [];
@@ -362,6 +369,10 @@ module.exports = function(RED) {
                     })(__initSend__);`;
                     iniOpt = createVMOpt(node, " setup");
                     iniScript = new vm.Script(iniText, iniOpt);
+                    if(node.timeout>0){
+                        iniOpt.timeout = node.timeout;
+                        iniOpt.breakOnSigint = true;
+                    }
                 }
                 node.script = vm.createScript(functionText, createVMOpt(node, ""));
                 if (node.fin && (node.fin !== "")) {
@@ -385,6 +396,10 @@ module.exports = function(RED) {
                     })();`;
                     finOpt = createVMOpt(node, " cleanup");
                     finScript = new vm.Script(finText, finOpt);
+                    if(node.timeout>0){
+                        finOpt.timeout = node.timeout;
+                        finOpt.breakOnSigint = true;
+                    }
                 }
                 var promise = Promise.resolve();
                 if (iniScript) {
@@ -396,9 +411,12 @@ module.exports = function(RED) {
                     var start = process.hrtime();
                     context.msg = msg;
                     context.__send__ = send;
-                    context.__done__ = done;
-
-                    node.script.runInContext(context);
+                    context.__done__ = done;    
+                    var opts = {};
+                    if (node.timeout>0){
+                        opts = node.timeoutOptions;
+                    }
+                    node.script.runInContext(context,opts);
                     context.results.then(function(results) {
                         sendResults(node,send,msg._msgid,results,false);
                         if (handleNodeDoneCall) {

packages/node_modules/@node-red/nodes/locales/de/messages.json

@@ -214,7 +214,8 @@
             "initialize": "Start",
             "finalize": "Stopp",
             "outputs": "Ausgänge",
-            "modules": "Module"
+            "modules": "Module",
+            "timeout": "Timeout (ms)"
         },
         "text": {
             "initialize": "// Der Code hier wird ausgeführt,\n// wenn der Node gestartet wird\n",

packages/node_modules/@node-red/nodes/locales/en-US/messages.json

@@ -248,7 +248,8 @@
             "initialize": "On Start",
             "finalize": "On Stop",
             "outputs": "Outputs",
-            "modules": "Modules"
+            "modules": "Modules",
+            "timeout": "Timeout (ms)"
         },
         "text": {
             "initialize": "// Code added here will be run once\n// whenever the node is started.\n",

packages/node_modules/@node-red/nodes/locales/ru/messages.json

@@ -212,7 +212,8 @@
             "function": "Функция",
             "initialize": "Настройка",
             "finalize": "Закрытие",
-            "outputs": "Выходы"
+            "outputs": "Выходы",
+            "timeout":"Время ожидания (мс)"
         },
         "text": {
             "initialize": "// Добавленный здесь код будет исполняться\n// однократно при развертывании узла.\n",

test/nodes/core/function/10-function_spec.js

@@ -1424,7 +1424,30 @@ describe('function node', function() {
         });
     });
 
-
+    it('should timeout if timeout is set', function(done) {
+        var flow = [{id:"n1",type:"function",wires:[["n2"]],timeout:"10",func:"while(1==1){};\nreturn msg;"}];
+        helper.load(functionNode, flow, function() {
+            var n1 = helper.getNode("n1");
+            n1.receive({payload:"foo",topic: "bar"});
+            setTimeout(function() {
+                try {
+                    helper.log().called.should.be.true();
+                    var logEvents = helper.log().args.filter(function(evt) {
+                        return evt[0].type == "function";
+                    });
+                    logEvents.should.have.length(1);
+                    var msg = logEvents[0][0];
+                    msg.should.have.property('level', helper.log().ERROR);
+                    msg.should.have.property('id', 'n1');
+                    msg.should.have.property('type', 'function');
+                    should.equal(msg.msg.message, 'Script execution timed out after 10ms');
+                    done();
+                } catch(err) {
+                    done(err);
+                }
+            },50);
+        });
+    });
 
     describe("finalize function", function() {