83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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var util = require("util");
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var spawn = require('child_process').spawn;
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var fs = require('fs');
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var gpioCommand = __dirname + '/nrsrf.py';
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if (!fs.existsSync("/dev/ttyAMA0")) { // unlikely if not on a Pi
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//util.log("Info : Ignoring Raspberry Pi specific node.");
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throw "Info : Ignoring Raspberry Pi specific node.";
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}
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if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
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util.log("[rpi-srf] Info : Can't find Pi RPi.GPIO python library.");
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throw "Warning : Can't find Pi RPi.GPIO python library.";
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}
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if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
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util.log("[rpi-srf] Error : " + gpioCommand + " needs to be executable.");
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throw "Error : " + gpioCommand + " must to be executable.";
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}
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function PiSrfNode(n) {
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RED.nodes.createNode(this, n);
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this.pins = n.pins;
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var node = this;
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if (node.pins !== undefined) {
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node.child = spawn(gpioCommand, [node.pins]);
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node.running = true;
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if (RED.settings.verbose) { node.log("pin: " + node.pins + " :"); }
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node.child.stdout.on('data', function(data) {
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if (RED.settings.verbose) { node.log("out: " + data + " :"); }
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data = data.toString().trim();
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if (data.length > 0) {
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node.send({topic:"SRF",payload:data});
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}
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});
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node.child.stderr.on('data', function(data) {
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if (RED.settings.verbose) { node.log("err: " + data + " :"); }
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});
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node.child.on('close', function(code) {
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if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
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node.child = null;
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node.running = false;
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});
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node.child.on('error', function(err) {
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if (err.errno === "ENOENT") { node.warn('Command not found'); }
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else if (err.errno === "EACCES") { node.warn('Command not executable'); }
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else { node.log('error: ' + err); }
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});
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}
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else {
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node.error("Invalid GPIO pins: " + node.pin);
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}
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var wfi = function(done) {
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if (!node.running) {
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if (RED.settings.verbose) { node.log("end"); }
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done();
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return;
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}
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setTimeout(function() { wfi(done); }, 333);
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}
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node.on("close", function(done) {
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if (node.child != null) {
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node.child.kill('SIGKILL');
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}
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wfi(done);
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});
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}
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RED.nodes.registerType("rpi-srf", PiSrfNode);
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}
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