Develop Reference

why messaging().sendtodevice is not working sometimes?

I'm using the following code to send a notification from one device to another using FCM. Everything works fine until before return admin.messaging().sendToDevice(...). The 'Token ID: ' log displays token ID of the receiver, but when I set the variable token_id to the sendToDevice function, the notification is not called, therefore the notification is not sent. Can someone tell me what's wrong?
var firebase = require("firebase-admin");
var serviceAccount = require("./julla-tutorial.json");
console.log("enter in then Firebase Api");
const firebaseToken = [
'e0T6j1AiRjaa7IXweJniJq:APA91bHNznSHSIey08s-C-c3gchci6wepvhP1QxQyYbmZ8LySI3wnu64iW7Q23GhA6VCdc4yodZoCFOgynfAb5C8O8VE81OcSv_LL-K3ET1IKGZ_6h35n-_q5EKFtfJWlzOqZr4IvpiB',
'dNWnSqyCQbufzv1JutNEWr:APA91bFcI9FDyRxHRBEcdw4791X0e-V0k1FjXcSstUA67l94hSojMRCd6LWr2b57azNEt3z_XLwLljMX4u2mc9cZDrAVm55Mw9CHGyue-09KofWnnHNR9XWBibc4T76xOV_DWX7T2RvW',
'cq65rtuaTCKGk5lHk7UabN:APA91bFR3kAArg6lhuBq7ktNuBk7Z9MXXk3PskqhYa8CgNaEl6MX4TQ5lo35d6XhnCQ4fEkCkyZ_j08evxE9Y4oVCRTEdqsrkccCVTE8Di47lfmDR3i1NdoL3re9oLw6F_uNsnvRoQcq'
]
firebase.initializeApp({
credential: firebase.credential.cert(serviceAccount)
})
const payload = {
notification: {
title: 'Demo 2345',
body: 'dfghj',
sound: 'default',
color: 'yellow',
android_channel_id: 'default',
channel_id: 'default'
},
data: { id: 'broadcast', channelId: 'default' }
}
const options = {
priority: 'high',
timeToLive: 60 * 60 * 24, // 1 day
};
console.log('------payload---',payload);
console.log('-----TOKEN_Array----',firebaseToken);
console.log('-------options-----',options);
firebase.messaging().sendToDevice(firebaseToken, payload, options).then(function (response) {
console.log('--------response',response);
}) .catch(function (error) {
console.log('-------rejet',reject);
});

It looks like you did not change the code from this tutorial:
https://medium.com/#jullainc/firebase-push-notifications-to-mobile-devices-using-nodejs-7d514e10dd4
you will need to change the 2nd line of code:
var serviceAccount = require("./julla-tutorial.json");
to actually point to your own firebase-push-admin.json file which holds your private keys registering your backend app with the firebase cloud messaging api. you can download this file from the firebase console as mentioned in the above article.
I recommend hiding this file from your git history by adding it to .gitignore so you dont accidentally push your private keys to a public repo.
I will link you another resource in addition to above link which helped me implement firebase push notifications in a nodeJS backend app.
https://izaanjahangir.medium.com/setting-schedule-push-notification-using-node-js-and-mongodb-95f73c00fc2e
https://github.com/izaanjahangir/schedule-push-notification-nodejs
Further I will also link you another repo where I am currently working on a fully functional firebase push notification implementation. Maybe it helps to actually see some example code.
https://gitlab.com/fiehra/plants-backend

Hyperledger-Composer: Issuing identity using REST-API results in error message "fabric-ca request register failed"

I have created a hyperledger-composer application with an Angular frontend and multi-user authentication.
The admin can create a new participant and issue an identity for this participant.
Adding the participant to the network works fine. But the second step - issuing an identity for this new participant results in the following error message:
"message": "fabric-ca request register failed with errors [[{\"code\":20,\"message\":\"Authorization failure\"}]]",
... see the following screenshots:
and
The method causing this error message is the following:
createBusinessNetworkCardFile(idOfNewParticipant: string): Promise<any> {
let identity = {
participant: org.comp.app# + idOfNewParticipant,
userID: idOfNewParticipant,
options: {}
};
return this.httpClient.post('/api/system/identities/issue', identity, {responseType: 'blob'}).toPromise()
.then(cardData => {
this.businessNetworkCardFile = new File([cardData], 'businessNetworkCard.card', {type: 'application/octet-stream', lastModified: Date.now()});
//some more code
});
}

Kibana Customized Visualization with ES and Angular Doesn't Work

First, I try to make a custom visualization in Kibana with learning here.
Then, I want my custom visualization to display like the clock how many hits my elasticsearch index has dynamically .
So, I changed some codes in above tutorial but they don't work.
Chrome Devtools tells says Error: The elasticsearch npm module is not designed for use in the browser. Please use elasticsearch-browser
I know I had better use elasticsearch-browser perhaps.
However, I want to understand what is wrong or why.
public/myclock.js
define(function(require) {
require('plugins/<my-plugin>/mycss.css');
var module = require('ui/modules').get('<my-plugin>');
module.controller('MyController', function($scope, $timeout) {
var setTime = function() {
$scope.time = Date.now();
$timeout(setTime, 1000);
};
setTime();
var es = function(){
var elasticsearch = require('elasticsearch');
var client = new elasticsearch.Client({
host: 'localhost:9200',
log: 'trace'
});
client.search({
index: 'myindex',
}).then(function (resp) {
$scope.tot = resp.hits.total;
}, function (err) {
console.trace(err.message);
});
};
es();
});
function MyProvider(Private) {
...
}
require('ui/registry/vis_types').register(MyProvider);
return MyProvider;
});
public/clock.html
<div class="clockVis" ng-controller="MyController">
{{ time | date:vis.params.format }}
{{tot}}
</div>
Thank you for reading.

Looks like the controller in angularjs treats the elasticsearch javascript client as if it was accessing from the browser.
To elude this, one choice will be by building Server API in index.js and then make kibana access to elasticsearch by executing http request.
Example
index.js
// Server API (init func) will call search api of javascript
export default function (kibana) {
return new kibana.Plugin({
require: ['elasticsearch'],
uiExports: {
visTypes: ['plugins/sample/plugin']
},
init( server, options ) {
// API for executing search query to elasticsearch
server.route({
path: '/api/es/search/{index}/{body}',
method: 'GET',
handler(req, reply) {
// Below is the handler which talks to elasticsearch
server.plugins.elasticsearch.callWithRequest(req, 'search', {
index: req.params.index,
body: req.params.body
}).then(function (error, response) {
reply(response);
});
}
});
}
});
}
controller.js
In the controller, you will need to call GET request for above example.
$http.get( url ).then(function(response) {
$scope.data = response.data;
}, function (response){
$scope.err = "request failed";
});
In my case, I used url instead of absolute or relative path since path of dashboard app was deep.
http://[serverip]:5601/iza/app/kibana#/dashboard/[Dashboard Name]
*
Your here
http://[serverip]:5601/iza/[api path]
*
api path will start here
I used this reference as an example.

How to monitor HTTP calls using browsermob-proxy and nightwatch.js?

I am writing testcases using Nightwatch.js framework for SPA application. A requirement came in here we have to monitor HTTP calls and get the performance results for the site. As this could be easily achieved using JMeter.
Using automation testing tool, we can do it by using browsermob-proxy and selenium.
Is it possible to do the same using Nightwatch.js and browsermob-proxy?
Also what are the steps to do to the same.

For using Nightwatchjs and browsermob-proxy together, check out this repo, which includes info on the NodeJS bindings for browsermob-proxy and programmatically generating HAR (HTTP Archive) files.
If you're content with just using Nightwatchjs, this repo has code in the tests directory for the following:
Custom command to get the requests made so far
Custom assertion for checking if a request, given a filter and query string params, exists.
You might have to brush up on how to add custom commands and assertions to your Nightwatch project, but after that you should be set to go!

You can use browsermob-proxy-api
just simply download browsermob-proxy server then
install by npm command: npm install browsermob-proxy-api --save-dev
configure you night watch like this in desiredCapabilites:
'test_settings': {
'default': {
'launch_url': 'http://localhost:3000',
'screenshots': {
'enabled': true, // if you want to keep screenshots
'path': './screenshots' // save screenshots here
},
'globals': {
'waitForConditionTimeout': 30000 // sometimes internet is slow so wait.
},
'desiredCapabilities': { // use Chrome as the default browser for tests
'browserName': 'chrome',
'proxy': {
'proxyType': 'manual',
'httpProxy': 'localhost:10800'
},
'acceptSslCerts': true,
'javascriptEnabled': true, // turn off to test progressive enhancement
}
},
then download index.js from here:
https://github.com/jmangs/node-browsermob-proxy-api
and add code from example to your step_definitions if you use gherkin or describe step

Bit late into dance. I managed to integrate browsermob to nightwatch. Here are the detailed steps
Download browsermob proxy https://bmp.lightbody.net/
Open your cmd and go to bin folder and then start browsermob using "browsermob-proxy".
I am assuming you have basic nightwatch setup. You also need mobproxy. Install it from "npm i browsermob-proxy-api"
Create a global hook in nightwatch. Say 'globalmodule.js' and give this file path in globals_path in nightwatch.json
In globalmodule, create global hooks as described in http://nightwatchjs.org/guide#external-globals
In beforeEach hook, add below code: //if you are not under corporate proxy and you dont need to chain to upstream proxy
var MobProxy = require('browsermob-proxy-api');
var proxyObj = new MobProxy({'host': 'localhost', 'port': '8080'});
//assuming you started browsermob in 8080 port. That is in step 2.
//if you are working under corporate proxy, you might have to chain your request. This needs editing in browsermob-proxy-api package. Follow steps given at end of this section.
Start proxy on new port
proxyObj.startPort(port, function (err, data) {
if (err) {
console.log(err);
} else {
console.log('New port started')
}
})
Once we have new port, we have to start our chrome browser in above port so that all browser request are proxied through browsermob.
proxyObj.startPort(port, function (err, data) {
if (err) {
console.log(err);
} else {
console.log('New port started')
var dataInJson = JSON.parse(data);
//Step 8:
this.test_settings.desiredCapabilities = {
"browserName": "chrome",
"proxyObj": proxyObj, //for future use
"proxyport": dataInJson.port, //for future use
"proxy": {
"proxyType": "manual",
"httpProxy": "127.0.0.1:" + dataInJson.port,
"sslProxy": "127.0.0.1:" + dataInJson.port //important is you have https site
},
"javascriptEnabled": true,
"acceptSslCerts": true,
"loggingPrefs": {
"browser": "ALL"
}
}
}
})
Try to run with above setting, you can check if cmd [created in step2 to confirm request are going via above port. There will be some activiy]
For creating HAR and getting created HAR, browsermob-proxy-api gives excellent api.
add createHAR.js in any path and mention that path in nightwatch.json[custom_commands section]
exports.command = function (callback) {
var self = this;
if (!self.options.desiredCapabilities.proxyObj) {
console.error('No proxy setup - did you call setupProxy() ?');
}
this.options.desiredCapabilities.proxyObj.createHAR(this.options.desiredCapabilities.proxyport, {
'captureHeaders': 'true',
'captureContent': 'true',
'captureBinaryContent': 'true',
'initialPageRef': 'homepage'
}, function (err, result){
if(err){
console.log(err)
}else{
console.log(result)
if (typeof callback === "function") {
console.log(this.options.desiredCapabilities.proxyObj);
console.log(this.options.desiredCapabilities.proxyport);
// console.log(result);
callback.call(self, result);
}
}
});
return this;
};
then to getHAR, add getHAR.js, add below code.
var parsedData;
exports.command = function(callback) {
var self = this;
if (!self.options.desiredCapabilities.proxy) {
console.error('No proxy setup - did you call setupProxy() ?');
}
self.options.desiredCapabilities.proxyObj.getHAR(self.options.desiredCapabilities.proxyport, function (err, data) {
console.log(self.options.desiredCapabilities.proxyObj);
console.log(self.options.desiredCapabilities.proxyport);
//console.log(result);
if(err){
console.log(err)
}else{
parsedData = JSON.parse(data)
console.log(parsedData.log.entries)
}
if (typeof callback === "function") {
console.log(self.options.desiredCapabilities.proxyObj);
console.log(self.options.desiredCapabilities.proxyport);
callback.call(self, parsedData);
}
});
return this;
};
At start of test, createHAR will not have proxyObj, So this step should be executed sync. Wrap that step with browser.perform()
browser.perform(function(){
browser.createHAR()
})
////some navigation
browser.perform(function(){
browser.getHAR()
})
Note: If you are working behind corporate proxy, You might have to use chain proxy piece which browsermob offers.
According to browsermob proxy documentation, get down to api section, -> /proxy can have request parameters "proxyUsername" and "proxyPassword"
In node_modules->browsermob-proxy-api->index.js
add below line after line 22:
this.proxyUsername = cfg.proxyUsername || '';
this.proxyPassword = cfg.proxyPassword || '';
this.queryString = cfg.queryString || 'httpProxy=yourupstreamProxy:8080'; //you will get this from pac file
then at line 177, where package is making request '/proxy' to browser.
replace
path: url
to
path: url + '?proxyUsername=' +this.proxyUsername + '&proxyPassword=' + this.proxyPassword + '&' + this.queryString

hapi.js best way to handle errors

I'm creating my first node.js REST web service using hapi.js. I'm curious as to the best way to handle errors let's say from my dao layer. Do i throw them in my dao layer and then just try/catch blocks to handle them and send back errors in my controller, or is there a better way that the cool kids are handling this?
routes/task.js
var taskController = require('../controllers/task');
//var taskValidate = require('../validate/task');
module.exports = function() {
return [
{
method: 'POST',
path: '/tasks/{id}',
config : {
handler: taskController.createTask//,
//validate : taskValidate.blah
}
}
]
}();
controllers/task.js
var taskDao = require('../dao/task');
module.exports = function() {
return {
/**
* Creates a task
*
* #param req
* #param reply
*/
createTask: function createTask(req, reply) {
taskDao.createTask(req.payload, function (err, data) {
// TODO: Properly handle errors in hapi
if (err) {
console.log(err);
}
reply(data);
});
}
}();
dao/task.js
module.exports = function() {
return {
createTask: function createTask(payload, callback) {
... Something here which creates the err variable...
if (err) {
console.log(err); // How to properly handle this bad boy
}
}
}();

Generic Solution w/ Fully Customisable Error Template/Messages
We wrote a Hapi Plugin that handles all errors seamlessly: npmjs.com/package/hapi-error
It lets you define your own custom error pages in 3 easy steps.
1. Install the plugin from npm:
npm install hapi-error --save
2. Include the plugin in your Hapi project
Include the plugin when you register your server:
server.register([require('hapi-error'), require('vision')], function (err) {
// your server code here ...
});
See: /example/server_example.js for simple example
3. Ensure that you have a View called error_template
Note: hapi-error plugin expects you are using Vision (the standard view rendering library for Hapi apps)
which allows you to use Handlebars, Jade, React, etc. for your templates.
Your error_template.html (or error_template.ext error_template.jsx) should make use of the 3 variables it will be passed:
errorTitle - the error tile generated by Hapi
statusCode - *HTTP statusCode sent to the client e.g: 404 (not found)
errorMessage - the human-friendly error message
for an example see: /example/error_template.html
That's it! Now your Hapi App handles all types of errors and you can throw your own custom ones too!
Note: hapi-error works for REST/APIs too. if the content type header (headers.acceps) is set to application/json then your app will return a JSON error to the client, otherwise an HTML page will be served.

In doing more research along with Ricardo Barros' comment on using Boom, here's what I ended up with.
controllers/task.js
var taskDao = require('../dao/task');
module.exports = function() {
return {
/**
* Creates a task
*
* #param req
* #param reply
*/
createTask: function createTask(req, reply) {
taskDao.createTask(req.payload, function (err, data) {
if (err) {
return reply(Boom.badImplementation(err));
}
return reply(data);
});
}
}();
dao/task.js
module.exports = function() {
return {
createTask: function createTask(payload, callback) {
//.. Something here which creates the variables err and myData ...
if (err) {
return callback(err);
}
//... If successful ...
callback(null, myData);
}
}();

I think the cool kids now use a package to caught unhandled errors with Hapi, I present to you, Poop.
The only thing Poop is missing is some rich documentation, but check it out, and you'll see that Poop is great.
Some of my friends went to a node.js event in Lisbon, on of the hosts was a guy in charge of web technology stack at Wallmart, they use Hapi.js, Poop and some other cool things.
So if they use poop it must be pretty awesome.
PS: The name is suppa awesome