Move nodes over from main repo

storage/leveldb/67-leveldb.js

@@ -0,0 +1,93 @@
+/**
+ * Copyright 2013 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+var RED = require("../../red/red");
+var lvldb = require('level');
+
+function LevelNode(n) {
+	RED.nodes.createNode(this,n);
+	this.dbname = n.db;
+	var node = this;
+	lvldb(this.dbname, function(err, db) {
+		if (err) node.error(err);
+		node.db = db;
+	});
+}
+RED.nodes.registerType("leveldbase",LevelNode);
+LevelNode.prototype.close = function() {
+    this.db.close();
+}
+
+function LevelDBNodeIn(n) {
+	RED.nodes.createNode(this,n);
+	this.level = n.level;
+	this.levelConfig = RED.nodes.getNode(this.level);
+
+	if (this.levelConfig) {
+		var node = this;
+		node.on("input", function(msg) {
+			if (typeof msg.topic === 'string') {
+				node.levelConfig.db.get(msg.topic, function(err, value) {
+					if (err) {
+						//node.warn(err);
+						// for some reason they treat nothing found as an error...
+						msg.payload = null;  // so we should return null
+					}
+					else { msg.payload = value; }
+					node.send(msg);
+				});
+			}
+			else {
+				if (typeof msg.topic !== 'string') node.error("msg.topic (the key is not defined");
+			}
+		});
+	}
+	else {
+		this.error("LevelDB database name not configured");
+	}
+}
+RED.nodes.registerType("leveldb in",LevelDBNodeIn);
+
+
+function LevelDBNodeOut(n) {
+	RED.nodes.createNode(this,n);
+	this.level = n.level;
+	this.operation = n.operation;
+	this.levelConfig = RED.nodes.getNode(this.level);
+
+	if (this.levelConfig) {
+		var node = this;
+		node.on("input", function(msg) {
+			if (typeof msg.topic === 'string') {
+				if (node.operation === "delete") {
+					node.levelConfig.db.del(msg.topic);
+				}
+				else {
+					node.levelConfig.db.put(msg.topic, msg.payload, function(err) {
+						if (err) node.error(err);
+					});
+				}
+			}
+			else {
+				if (typeof msg.topic !== 'string') node.error("msg.topic (the key is not defined");
+			}
+		});
+	}
+	else {
+		this.error("LevelDB database name not configured");
+	}
+}
+RED.nodes.registerType("leveldb out",LevelDBNodeOut);