Intial Commit

nodered/rootfs/data/node_modules/node-red-node-tail/28-tail.js

@@ -0,0 +1,80 @@
+
+module.exports = function(RED) {
+    "use strict";
+    var fs = require('fs');
+    var Tail = require('tail').Tail;
+
+    function TailNode(n) {
+        RED.nodes.createNode(this,n);
+
+        this.filename = n.filename || "";
+        this.filetype = n.filetype || "text";
+        this.split = new RegExp(n.split.replace(/\\r/g,'\r').replace(/\\n/g,'\n').replace(/\\t/g,'\t') || "[\r]{0,1}\n");
+        var node = this;
+
+        var fileTail = function() {
+            if (fs.existsSync(node.filename)) {
+                if (node.filetype === "text") {
+                    node.tail = new Tail(node.filename,{separator:node.split, flushAtEOF:true});
+                }
+                else {
+                    node.tail = new Tail(node.filename,{separator:null, flushAtEOF:true, encoding:"binary"});
+                }
+
+                node.tail.on("line", function(data) {
+                    if (data.length > 0) {
+                        var msg = { topic:node.filename };
+                        if (node.filetype === "text") {
+                            msg.payload = data.toString();
+                            node.send(msg);
+                        }
+                        else {
+                            msg.payload = Buffer.from(data,"binary");
+                            node.send(msg);
+                        }
+                    }
+                });
+
+                node.tail.on("error", function(err) {
+                    node.status({ fill: "red",shape:"ring", text: "node-red:common.status.error" });
+                    node.error(err.toString());
+                });
+            }
+            else {
+                node.tout = setTimeout(function() { fileTail(); },10000);
+                node.warn(RED._("tail.errors.filenotfound") + ": "+node.filename);
+            }
+        }
+
+        if (node.filename !== "") {
+            node.status({});
+            fileTail();
+        } else {
+            node.status({ fill: "grey", text: "tail.state.stopped" });
+            node.on('input', function (msg) {
+                if (!msg.hasOwnProperty("filename")) {
+                    node.error(RED._("tail.state.nofilename"));
+                } else if (msg.filename === "") {
+                    node.filename = "";
+                    if (node.tail) { node.tail.unwatch(); }
+                    if (node.tout) { clearTimeout(node.tout); }
+                    node.status({ fill: "grey", text: "tail.state.stopped" });
+                } else {
+                    node.filename = msg.filename;
+                    if (node.tail) { node.tail.unwatch(); }
+                    if (!node.tout) { fileTail(); }
+                    node.status({ fill: "green", text: node.filename });
+                }
+            });
+        }
+
+        node.on("close", function() {
+            /* istanbul ignore else */
+            if (node.tail) { node.tail.unwatch(); }
+            delete node.tail;
+            if (node.tout) { clearTimeout(node.tout); }
+        });
+    }
+
+    RED.nodes.registerType("tail",TailNode);
+}