Update node-red-random to add option to dynamically pass in 'To' and 'From' (#707)

* Add option to dynamically pass in 'From' and 'To' - fixed bug when 'From' was greater than 'To' by flipping the two

* Set initial values of 'From' and 'To to "" to allow dynamic overriding them

function/random/README.md

@@ -19,4 +19,6 @@ If set to return an integer it can include both the low and high values.
 If set to return a floating point value it will be from the low value, up to, but
 **not** including the high value. `min <= n < max` - so selecting 1 to 6 will return values 1 <= n < 6 .
 
+You can dynamically pass in the 'From' and 'To' values to the node using msg.to and/or msg.from. **NOTE:** hard coded values in the node **always take precedence**.
+
 **Note:** This returns numbers - objects of type **number**.

function/random/locales/en-US/random.html

@@ -1,7 +1,14 @@
 <script type="text/html" data-help-name="random">
-    <p>Generates a random number between a low and high value.</p>
+    <p>Generates a random number between a low and high value. Defaults to 1 to 10.</p>
     <p>If set to return an integer it can <i>include</i> both the low and high values.
     <code>min <= n <= max</code></p>
     <p>If set to return a floating point value it will be from the low value, up to, but
     not including the high value. <code>min <= n < max</code></p>
+    <p><b>Inputs</b></p>
+    <p>You can dynamically pass in the 'From' and 'To' values to the node. <b>NOTE:</b> hard coded values in the node <b>always take precedence.</b>
+    <ul>
+    <i><b>From</b> [msg.from] Number containing the low value to be used.</i>
+    <br>
+    <i><b>To</b> [msg.to] Number containing the high value to be used.</i>
+    </ul>
 </script>

function/random/random.html

@@ -31,8 +31,8 @@
         color:"#E2D96E",
         defaults: {
             name: {value:""},
-            low: {value:"1"},
-            high: {value:"10"},
+            low:  {value: 1,validate:function(v) { return  !isNaN(v) || v.length === 0;} },
+            high: {value: 10,validate:function(v) { return  !isNaN(v) || v.length === 0;} },
             inte: {value:"true"},
             property: {value:"payload",required:true}
         },

function/random/random.js

@@ -3,21 +3,73 @@ module.exports = function(RED) {
     "use strict";
     function RandomNode(n) {
         RED.nodes.createNode(this,n);
-        this.low = Number(n.low || 1);
-        this.high = Number(n.high || 10);
+
+        this.low = n.low
+        this.high = n.high
         this.inte = n.inte || false;
         this.property = n.property||"payload";
         var node = this;
+        var tmp = {};
+
         this.on("input", function(msg) {
-            var value;
-            if (node.inte == "true" || node.inte === true) {
-                value = Math.round(Math.random() * (node.high - node.low + 1) + node.low - 0.5);
+
+          tmp.low = 1                 // set this as the default low value
+          tmp.low_e = ""
+          if (node.low) {             // if the the node has a value use it
+              tmp.low = node.low
+          } else if ('from' in msg) { // else see if a 'from' is in the msg
+              if (Number(msg.from)) { // if it is, and is a number, use it
+                  tmp.low = Number(msg.from);
+              } else {                // otherwise setup NaN error
+                  tmp.low = NaN;
+                  tmp.low_e = " From: " + msg.from; // setup to show bad incoming msg.from
               }
-            else {
-                value = Math.random() * (node.high - node.low) + node.low;
           } 
+              
+          tmp.high = 10               // set this as the default high value  
+          tmp.high_e = "";
+          if (node.high) {            // if the the node has a value use it 
+              tmp.high = node.high
+          } else if ('to' in msg) {   // else see if a 'to' is in the msg
+              if (Number(msg.to)) {   // if it is, and is a number, use it
+                  tmp.high = Number(msg.to);
+              } else {                // otherwise setup NaN error 
+                  tmp.high = NaN
+                  tmp.high_e = " To: " + msg.to // setup to show bad incoming msg.to
+              }
+          } 
+                           
+          // if tmp.low or high are not numbers, send an error msg with bad values
+          if ( (isNaN(tmp.low)) || (isNaN(tmp.high)) ) {
+              this.error("Random: one of the input values is not a number. " + tmp.low_e + tmp.high_e);
+          } else {
+          // at this point we have valid values so now to generate the random number! 
+
+             // flip the values if low > high so random will work
+             var value = 0;
+             if (tmp.low > tmp.high) {  
+                 value = tmp.low
+                 tmp.low = tmp.high
+                 tmp.high = value
+             }
+
+             // if returning an integer, do a math.ceil() on the low value and a 
+             // Math.floor()high value before generate the random number. This must be 
+             // done to insure the rounding doesn't round up if using something like 4.7
+             // which would end up with 5
+             if ( (node.inte == "true") || (node.inte === true) ) {
+                 tmp.low  = Math.ceil(tmp.low);
+                 tmp.high = Math.floor(tmp.high);
+                 // use this to round integers
+                 value = Math.round(Math.random() * (tmp.high - tmp.low + 1) + tmp.low - 0.5);
+             } else {
+                 // use this to round floats
+                 value = (Math.random() * (tmp.high - tmp.low)) + tmp.low;
+             }
+            
              RED.util.setMessageProperty(msg,node.property,value);
              node.send(msg);
+          }
         });
     }
     RED.nodes.registerType("random",RandomNode);

test/function/random/random_spec.js

@@ -16,73 +16,256 @@ describe('random node', function() {
         });
     });
     
-    it("should be loaded with correct defaults", function(done) {
-        var flow = [{"id":"n1", "type":"random", "name":"random1", "wires":[[]]}];
-        helper.load(testNode, flow, function() {
-            var n1 = helper.getNode("n1");
-            //console.log(n1);
-            n1.should.have.property("low", 1);
-            n1.should.have.property("high", 10);
-            n1.should.have.property("inte", false);
-            done();
-        });
-    });
+// ============================================================
 
-    it('should output an integer between -3 and 3', function(done) {
-        var flow = [{"id":"n1", "type":"random", low:-3, high:3, inte:true, wires:[["n2"]] },
+   it ("Test i1 (integer) - DEFAULT no overrides defaults to 1 and 10", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "" , high:"" , inte:true, wires:[["n2"]] },  
             {id:"n2", type:"helper"} ];
         helper.load(testNode, flow, function() { 
             var n1 = helper.getNode("n1");
             var n2 = helper.getNode("n2");
-            var c = 0;
             n2.on("input", function(msg) {  
-                if (c === 0) {
+                try {
+                    //console.log(msg);    
                     msg.should.have.a.property("payload");       
-                    msg.payload.should.be.approximately(0,3);
+                    msg.payload.should.be.within(1,10);     
+                    msg.payload.toString().indexOf(".").should.equal(-1); // see if it's really an integer and not a float...
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test i1"});  
+        });
+    });
+
+   it ("Test f1 (float)   - DEFAULT no overrides defaults to 1 and 10", function(done) {  
+        var flow = [{id:"n1", type:"random", low:"" , high:"" , inte:false, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(1.0,9.999);     
+                    //msg.payload.toString().indexOf(".").should.not.equal(-1); 
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test f-1"});  
+        });
+    });
+
+// ============================================================
+
+   it ("Test i2 (integer) - FLIP node From = 3 To = -3", function(done) {  
+        var flow = [{id:"n1", type:"random", low: 3, high: -3, inte:true, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(-3,3);     
+                    msg.payload.toString().indexOf(".").should.equal(-1); // slightly dumb test to see if it really is an integer and not a float...
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test i2"});  
+        });
+    });
+
+   it ("Test f2 (float)   - FLIP node From = 3 To = -3", function(done) {  
+        var flow = [{id:"n1", type:"random", low: 3, high: -3, inte:false, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(-3.0,3.0);     
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test f2"});  
+        });
+    });
+
+// ============================================================
+
+   it ("Test i3 (integer) - values in msg From = 2 To = '5', node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:true, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(2,5);     
+                    msg.payload.toString().indexOf(".").should.equal(-1); // slightly dumb test to see if it really is an integer and not a float...
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test i3", "from":2, "to":'5'});  
+        });
+    });
+
+   it ("Test f3 (float)   - values in msg From = 2 To = '5', node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:false, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(2.0,5.0);     
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test f3", "from":2, "to":'5'});  
+        });
+    });
+
+
+ // ============================================================
+
+  it ("Test i4 (integer) - value in msg From = 2, node From = 5 To = '' - node overides From = 5 To defaults to 10", function(done) {  
+        var flow = [{id:"n1", type:"random", low: 5, high:"", inte:true, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(5,10);     
                     msg.payload.toString().indexOf(".").should.equal(-1); 
                     done(); 
                 }
+                catch(err) { done(err); }   
             });
-            n1.emit("input", {payload:"a"});
+            n1.emit("input", {"test":"Test i4", "from": 2});  
         });
     });
 
-    it('should output an float between 20 and 30', function(done) {
-        var flow = [{"id":"n1", "type":"random", low:20, high:30, inte:false, wires:[["n2"]] },
+  it ("Test f4 (float)   - value in msg From = 2, node From = 5 To = '' - node wins 'To' defaults to 10", function(done) {  
+        var flow = [{id:"n1", type:"random", low: 5, high:"", inte:false, wires:[["n2"]] },  
             {id:"n2", type:"helper"} ];
         helper.load(testNode, flow, function() { 
             var n1 = helper.getNode("n1");
             var n2 = helper.getNode("n2");
-            var c = 0;
             n2.on("input", function(msg) {  
-                if (c === 0) {
+                try {
+                    //console.log(msg);    
                     msg.should.have.a.property("payload");       
-                    msg.payload.should.be.approximately(25,5);
-                    msg.payload.toString().indexOf(".").should.not.equal(-1);
+                    msg.payload.should.be.within(5.0,10.0);     
                     done(); 
                 }
+                catch(err) { done(err); }   
             });
-            n1.emit("input", {payload:"a"});
+            n1.emit("input", {"test":"Test f4", "from": 2});  
         });
     });
 
-    it('should output an integer between -3 and 3 on chosen property - foo', function(done) {
-        var flow = [{"id":"n1", "type":"random", property:"foo", low:-3, high:3, inte:true, wires:[["n2"]] },
+// ============================================================
+
+  it ("Test i5 (integer) - msg From = '6' To = '9' node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:true, wires:[["n2"]] },  
             {id:"n2", type:"helper"} ];
         helper.load(testNode, flow, function() { 
             var n1 = helper.getNode("n1");
             var n2 = helper.getNode("n2");
-            var c = 0;
             n2.on("input", function(msg) {  
-                if (c === 0) {
-                    msg.should.have.a.property("foo");
-                    msg.foo.should.be.approximately(0,3);
-                    msg.foo.toString().indexOf(".").should.equal(-1);
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(6,9);     
+                    msg.payload.toString().indexOf(".").should.equal(-1); // slightly dumb test to see if it really is an integer and not a float...
                     done(); 
                 }
+                catch(err) { done(err); }   
             });
-            n1.emit("input", {payload:"a"});
+            n1.emit("input", {"test":"Test i5", "from": '6', "to": '9'});  
         });
     });
 
+  it ("Test f5 (float)   - msg From = '6' To = '9' node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:false, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(6.0,9.0);     
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test f5", "from": '6', "to": '9'});  
+        });
+    });
+
+// ============================================================
+
+  it ("Test i6 (integer) - msg From = 2.4 To = '7.3' node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:true, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(2,7);     
+                    msg.payload.toString().indexOf(".").should.equal(-1); // slightly dumb test to see if it really is an integer and not a float...
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test i6", "from": 2.4, "to": '7.3'});  
+        });
+    });
+
+  it ("Test f6 (float)   - msg From = 2.4 To = '7.3' node no entries", function(done) {  
+        var flow = [{id:"n1", type:"random", low: "", high: "", inte:false, wires:[["n2"]] },  
+            {id:"n2", type:"helper"} ];
+        helper.load(testNode, flow, function() { 
+            var n1 = helper.getNode("n1");
+            var n2 = helper.getNode("n2");
+            n2.on("input", function(msg) {  
+                try {
+                    //console.log(msg);    
+                    msg.should.have.a.property("payload");       
+                    msg.payload.should.be.within(2.4,7.3);     
+                    done(); 
+                }
+                catch(err) { done(err); }   
+            });
+            n1.emit("input", {"test":"Test f6", "from": 2.4, "to": '7.3'});  
+        });
+    });
+
+// ============================================================
+
+
+   
 });