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Reuse vm context to speed up Function nodes

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If the NODE_RED_FUNCTION_TIME environment variable is set, the
function nodes publish a status of how long the function took
to run, in ms.
This commit is contained in:
Nick O'Leary 2014-09-05 10:40:57 +01:00
parent 06542d95f2
commit 293725afcd
1 changed files with 18 additions and 7 deletions
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25
nodes/core/core/80-function.js
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@ -25,18 +25,26 @@ module.exports = function(RED) {
RED.nodes.createNode(this,n);
this.name = n.name;
this.func = n.func;
var functionText = "var results = (function(msg){"+this.func+"\n})(msg);";
var functionText = "var results = null; results = (function(msg){"+this.func+"\n})(msg);";
this.topic = n.topic;
this.context = {global:RED.settings.functionGlobalContext || {}};
var sandbox = {
console:console,
util:util,
Buffer:Buffer,
context: {
global:RED.settings.functionGlobalContext || {}
}
};
var context = vm.createContext(sandbox);
try {
this.script = vm.createScript(functionText);
this.on("input", function(msg) {
if (msg != null) {
var sandbox = {msg:msg,console:console,util:util,Buffer:Buffer,context:this.context};
try {
this.script.runInNewContext(sandbox);
var results = sandbox.results;
var start = process.hrtime();
context.msg = msg;
this.script.runInContext(context);
var results = context.results;
if (results == null) {
results = [];
} else if (results.length == null) {
@ -56,7 +64,10 @@ module.exports = function(RED) {
}
}
this.send(results);
var duration = process.hrtime(start);
if (process.env.NODE_RED_FUNCTION_TIME) {
this.status({fill:"yellow",shape:"dot",text:""+Math.floor((duration[0]* 1e9 + duration[1])/10000)/100});
}
} catch(err) {
this.error(err.toString());
}