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Okay - leveldb node is back... addressing Issue #26
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Dave C-J
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1918322ef0
121
nodes/storage/67-leveldb.html
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121
nodes/storage/67-leveldb.html
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<!--
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Copyright 2013 IBM Corp.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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<script type="text/x-red" data-template-name="leveldbase">
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<div class="form-row">
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<label for="node-config-input-db"><i class="icon-briefcase"></i> Database</label>
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<input type="text" id="node-config-input-db" placeholder="database path/name">
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</div>
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</script>
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<script type="text/javascript">
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RED.nodes.registerType('leveldbase',{
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category: 'config',
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defaults: {
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db: {value:"",required:true}
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},
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label: function() {
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return this.db;
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}
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});
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</script>
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<script type="text/x-red" data-template-name="leveldb in">
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<div class="form-row node-input-level">
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<label for="node-input-level"><i class="icon-briefcase"></i> Database</label>
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<input type="text" id="node-input-level">
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</div>
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<div class="form-row">
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<label for="node-input-name"><i class="icon-tag"></i> Name</label>
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<input type="text" id="node-input-name" placeholder="Name">
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</div>
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</script>
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<script type="text/x-red" data-help-name="leveldb in">
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<p>Uses <a href="https://code.google.com/p/leveldb/" target="_new"><i>LevelDB</i></a> for a simple key value pair database.</p>
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<p>Use this node to <b>get</b>, or retrieve the data already saved in the database.</p>
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<p><b>msg.topic</b> must hold the <i>key</i> for the database, and the result is returned in <b>msg.payload</b>.</p>
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</script>
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<script type="text/javascript">
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RED.nodes.registerType('leveldb in',{
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category: 'storage-input',
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color:"#dbb84d",
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defaults: {
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level: {type:"leveldbase",required:true},
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name: {value:""}
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},
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inputs:1,
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outputs:1,
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icon: "leveldb.png",
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label: function() {
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var levelNode = RED.nodes.node(this.level);
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return this.name||(levelNode?levelNode.label():"leveldb");
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},
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labelStyle: function() {
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return this.name?"node_label_italic":"";
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}
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});
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</script>
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<script type="text/x-red" data-template-name="leveldb out">
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<div class="form-row node-input-level">
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<label for="node-input-level"><i class="icon-briefcase"></i> Database</label>
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<input type="text" id="node-input-level">
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</div>
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<div class="form-row">
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<label for="node-input-operation"><i class="icon-wrench"></i> Operation</label>
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<select type="text" id="node-input-operation" style="display: inline-block; vertical-align: top;">
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<option value="store">Store</option>
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<option value="delete">Delete</option>
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</select>
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</div>
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<div class="form-row">
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<label for="node-input-name"><i class="icon-tag"></i> Name</label>
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<input type="text" id="node-input-name" placeholder="Name">
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</div>
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</script>
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<script type="text/x-red" data-help-name="leveldb out">
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<p>Uses <a href="https://code.google.com/p/leveldb/" target="_new"><i>LevelDB</i></a> for a simple key value pair database.</p>
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<p>Use this node to either <b>put</b> (store) the <b>msg.payload</b> to the named database file, using <b>msg.topic</b> as the key.</p>
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<p>To <b>delete</b> information select delete in the properties dialogue and again use <b>msg.topic</b> as the key.</b>.</p>
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</script>
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<script type="text/javascript">
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RED.nodes.registerType('leveldb out',{
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category: 'storage-output',
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color:"#dbb84d",
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defaults: {
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level: {type:"leveldbase",required:true},
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operation: {value:"store"},
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name: {value:""}
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},
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inputs:1,
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outputs:0,
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icon: "leveldb.png",
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align: "right",
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label: function() {
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var levelNode = RED.nodes.node(this.level);
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return this.name||(levelNode?levelNode.label():"leveldb");
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},
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labelStyle: function() {
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return this.name?"node_label_italic":"";
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}
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});
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</script>
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90
nodes/storage/67-leveldb.js
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90
nodes/storage/67-leveldb.js
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/**
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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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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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