83 lines
2.9 KiB
JavaScript
83 lines
2.9 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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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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this.encoding = n.encoding || "utf8";
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this.ready = false;
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var node = this;
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lvldb(this.dbname, {valueEncoding:this.encoding}, function(err, db) {
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if (err) { node.error(err); }
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node.db = db;
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node.db.on('ready', function() { node.ready = true; });
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node.db.on('closing', function() { node.ready = false; });
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});
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node.on('close', function() {
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if (node.db) {
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node.ready = false;
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node.db.close();
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}
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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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var node = this;
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node.on("input", function(msg) {
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if (node.levelConfig && node.levelConfig.ready) {
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var key = msg.topic.toString();
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if (key && (key.length > 0)) {
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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 { node.error("Cannot make key string from msg.topic"); }
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}
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else { node.error("Database not ready",msg); }
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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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var node = this;
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node.on("input", function(msg) {
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if (node.levelConfig && node.levelConfig.ready) {
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var key = msg.topic.toString();
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if (key && (key.length > 0)) {
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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,msg); }
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});
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}
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}
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else { node.error("Cannot make key string from msg.topic",msg); }
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}
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else { node.error("Database not ready",msg); }
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});
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}
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RED.nodes.registerType("leveldb out",LevelDBNodeOut);
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}
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