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