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node-red-nodes/hardware/PiSrf/pisrf.js

95 lines
3.3 KiB
JavaScript

module.exports = function(RED) {
"use strict";
var util = require("util");
var spawn = require('child_process').spawn;
var fs = require('fs');
var gpioCommand = __dirname + '/nrsrf.py';
var allOK = true;
try {
var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
if (cpuinfo.indexOf(": BCM") === -1) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
allOK = false;
}
else if (!fs.existsSync("/usr/share/doc/python-rpi.gpio")) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.libnotfound"));
allOK = false;
}
else if (!(1 & parseInt ((fs.statSync(gpioCommand).mode & parseInt ("777", 8)).toString (8)[0]))) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.needtobeexecutable",{command:gpioCommand}));
allOK = false;
}
}
catch(err) {
RED.log.warn("rpi-srf : "+RED._("node-red:rpi-gpio.errors.ignorenode"));
allOK = false;
}
function PiSrfNode(n) {
RED.nodes.createNode(this, n);
this.topic = n.topic;
this.pins = n.pins;
this.pins += ","+(n.pulse || 0.5);
var node = this;
if (allOK === true) {
if (node.pins !== undefined) {
node.child = spawn(gpioCommand, [node.pins]);
node.running = true;
if (RED.settings.verbose) { node.log("parameters: " + node.pins + " :"); }
node.child.stdout.on('data', function(data) {
if (RED.settings.verbose) { node.log("out: " + data + " :"); }
data = data.toString().trim();
if (data.length > 0) {
node.send({topic:node.topic, payload:data});
}
});
node.child.stderr.on('data', function(data) {
if (RED.settings.verbose) { node.log("err: " + data + " :"); }
});
node.child.on('close', function(code) {
if (RED.settings.verbose) { node.log("ret: " + code + " :"); }
node.child = null;
node.running = false;
});
node.child.on('error', function(err) {
if (err.errno === "ENOENT") { node.warn('Command not found'); }
else if (err.errno === "EACCES") { node.warn('Command not executable'); }
else { node.log('error: ' + err); }
});
}
else {
node.error("Invalid Parameters: " + node.pins);
}
var wfi = function(done) {
if (!node.running) {
if (RED.settings.verbose) { node.log("end"); }
done();
return;
}
setTimeout(function() { wfi(done); }, 333);
}
node.on("close", function(done) {
if (node.child != null) {
node.child.kill('SIGKILL');
}
wfi(done);
});
}
else {
node.status({fill:"grey",shape:"dot",text:"node-red:rpi-gpio.status.not-available"});
}
}
RED.nodes.registerType("rpi-srf", PiSrfNode);
}