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Start making non-red-nodes tolerant to missing payloads

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This commit is contained in:
dceejay
2015-03-31 13:18:25 +01:00
parent 32f6dc0346
commit 3896a82bd8
13 changed files with 210 additions and 122 deletions
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59
utility/exif/94-exif.js
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@@ -1,5 +1,5 @@
/**
* Copyright 2014 IBM Corp.
* Copyright 2014, 2015 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -24,15 +24,18 @@ module.exports = function(RED) {
return result;
}
/***
* Extracts GPS location information from Exif data. If enough information is
* provided, convert the Exif data into a pair of single floating point number
* latitude/longitude data pairs. Populates msg.location with these.
* Assumes that the msg object will always have exifData available as msg.exif.
* Assume that the GPS data saved into Exif provides a valid value
*/
function addMsgLocationDataFromExifGPSData(msg) {
if(msg.exif.gps) {
function ExifNode(n) {
RED.nodes.createNode(this,n);
var node = this;
/***
* Extracts GPS location information from Exif data. If enough information is
* provided, convert the Exif data into a pair of single floating point number
* latitude/longitude data pairs. Populates msg.location with these.
* Assumes that the msg object will always have exifData available as msg.exif.
* Assume that the GPS data saved into Exif provides a valid value
*/
function addMsgLocationDataFromExifGPSData(msg) {
var gpsData = msg.exif.gps; // declaring variable purely to make checks more readable
if(gpsData.GPSAltitude) {
if(!msg.location) {
@@ -44,26 +47,22 @@ module.exports = function(RED) {
// The data provided in Exif is in degrees, minutes, seconds, this is to be converted into a single floating point degree
if(gpsData.GPSLatitude.length === 3) { // OK to convert latitude
if(gpsData.GPSLongitude.length === 3) { // OK to convert longitude
var latitude = convertDegreesMinutesSecondsToDecimals(gpsData.GPSLatitude[0], gpsData.GPSLatitude[1], gpsData.GPSLatitude[2]);
latitude = Math.round(latitude * 100000)/100000;
// (N)orth means positive latitude
// (S)outh means negative latitude
// (E)ast means positive longitude
// (W)est means negative longitude
if(gpsData.GPSLatitudeRef.toString() === 'S' || gpsData.GPSLatitudeRef.toString() === 's') {
var latitude = convertDegreesMinutesSecondsToDecimals(gpsData.GPSLatitude[0], gpsData.GPSLatitude[1], gpsData.GPSLatitude[2]);
latitude = Math.round(latitude * 100000)/100000; // 5dp is approx 1m resolution...
// (N)orth means positive latitude, (S)outh means negative latitude
if (gpsData.GPSLatitudeRef.toString() === 'S' || gpsData.GPSLatitudeRef.toString() === 's') {
latitude = latitude * -1;
}
var longitude = convertDegreesMinutesSecondsToDecimals(gpsData.GPSLongitude[0], gpsData.GPSLongitude[1], gpsData.GPSLongitude[2]);
longitude = Math.round(longitude * 100000)/100000;
if(gpsData.GPSLongitudeRef.toString() === 'W' || gpsData.GPSLongitudeRef.toString() === 'w') {
longitude = Math.round(longitude * 100000)/100000; // 5dp is approx 1m resolution...
// (E)ast means positive longitude, (W)est means negative longitude
if (gpsData.GPSLongitudeRef.toString() === 'W' || gpsData.GPSLongitudeRef.toString() === 'w') {
longitude = longitude * -1;
}
if(!msg.location) {
msg.location = {};
}
// Create location property if not exists
if (!msg.location) { msg.location = {}; }
msg.location.lat = latitude;
msg.location.lon = longitude;
return;
@@ -76,30 +75,22 @@ module.exports = function(RED) {
} else {
node.log("The location of this image cannot be determined safely so no location information has been added to the message.");
}
} else {
node.log("No location info found in this image.");
}
}
function ExifNode(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input", function(msg) {
try {
if (msg.payload) {
if (Buffer.isBuffer(msg.payload)) {
new ExifImage({ image : msg.payload }, function (error, exifData) {
if (error) {
//node.error('Failed to extract Exif data from image.');
//node.log('Failed to extract Exif data from image. '+ error);
node.log(error);
node.log(error.toString());
} else {
//msg.payload remains the same buffer
if(exifData) {
if ((exifData) && (exifData.hasOwnProperty("gps")) && (Object.keys(exifData.gps).length !== 0)) {
msg.exif = exifData;
addMsgLocationDataFromExifGPSData(msg);
} else {
node.warn("The incoming buffer did not contain Exif data, nothing to do. ");
node.warn("The incoming image did not contain Exif GPS data, nothing to do. ");
}
}
node.send(msg);