I'm using npm ws package for websocket. I'm not being able send message into chatroom. any idea how to do it. Below is my code with sendMessage() and broadcast()
const sendMessage = (room_name, message, socket) => {
// rooms[room_name].message = JSON.stringify(message);
const obj = rooms[room_name];
for(i=0;i<obj.length;i++){
var temp = obj[i];
for(var innerObject in temp){
var wsClientID = temp[innerObject];
if(socket!==wsClientID){
wsClientID.send(JSON.stringify({
'message':message,
}));
}
}
}
// rooms[room_name].message = message;
socket.send(JSON.stringify(message));
// rooms[room_name].message = message;
}
socket.on("message", async (data) => {
broadcast(data)}
function broadcast(data) {
var count = 0;
for (const client of server.clients) {
if (client.readyState === socket.OPEN) {
count++;
client.send(data.toString())
}
}
}
Related
I have a loader function called getBlogData which is like this:
import { getFromCacheOrApi } from 'Base'
const getBlogData = async () => {
const { pathname } = { pathname: "" }
var url = '/blog/data?'
let matches = /\/blog(\/\d+)?\/?$/.exec(pathname)
if (matches != null) {
const pageNumber = matches[1]
if (pageNumber !== undefined) {
url += `&pageNumber=${pageNumber.replace('/', '')}`
}
}
else {
const secondSegments = ['category', 'tag', 'author', 'search']
if (pathname.split('/').length >= 2 && !secondSegments.includes(pathname.split('/')[2])) {
response.status = 404
return
}
for (let i = 0; i < secondSegments.length; i++) {
const segment = secondSegments[i]
if (pathname.startsWith(`/blog/${segment}`)) {
matches = new RegExp(`(?<=\\/blog\\/${segment}\\/)[^/]+\\/?(\\d+)?\\/?$`).exec(pathname)
if (matches == null) {
response.status = 404
return
}
else {
url += `&${segment}=${encodeURI(matches[0].split('/')[0])}`
const pageNumber = matches[1]
if (pageNumber !== undefined) {
url += `&pageNumber=${pageNumber}`
}
break
}
}
}
}
url = url.replace('?&', '?')
const data = await getFromCacheOrApi(url)
// console.log(params, response.status)
// if (pageNumber && isNaN(pageNumber)) {
// console.log(pageNumber, isNaN(pageNumber))
// response.status = 400
// return
// }
const { seoParameters } = data
return data
}
export default getBlogData
This function is only used in my page which is inside app directory in Next 13, which means that it's a server component, and I don't want to change it to a client component.
However, I need to access request data, in this particular case, the path of the URL.
How can I get that?
I'm experimenting with gjs and webkit2, how can i get the http headers of a request made with load_uri
i have the following code
const Gtk = imports.gi.Gtk, WebKit=imports.gi.WebKit2, contentManager=new WebKit.UserContentManager,
view = WebKit.WebView.new_with_user_content_manager(contentManager);
Gtk.init(null);
let win = new Gtk.Window(), Response=new WebKit.URIResponse();
contentManager.add_script (new WebKit.UserScript("alert ('test');",0,1,null,null));
view.load_uri('https://www.gnome.org');
win.add(view);
win.set_title("test");
win.set_icon_from_file("/games/aptdaemon-resolve.png");
win.connect('destroy', () => { Gtk.main_quit(); });
win.set_size_request(640, 480);
win.show_all();
view.connect("load-changed",function (instance,state)
{
if (state == 3)
{
log ("URL"+Response.get_uri());
view.run_javascript ("alert (document.body.innerHTML)",null,null);
}
});
Gtk.main();
for example Response.get_uri returns an empty string, how to access response headers, and how to exchange messages between scripts injected with view.run_javascript and gjs. i want the body html be sent to gjs-?
got it
const Gtk = imports.gi.Gtk;
const WebKit=imports.gi.WebKit2;
Gtk.init(null);
const win = new Gtk.Window(), contentManager=new WebKit.UserContentManager, view = WebKit.WebView.new_with_user_content_manager(contentManager);
let response_STR;
contentManager.connect("script-message-received::pipe", function (instance, message)
{
message=message.get_js_value().to_string ();
log (message);
});
contentManager.register_script_message_handler("pipe");
view.load_uri('https://www.gnome.org');
win.add(view);
win.set_title("test");
win.connect('destroy', () => { Gtk.main_quit(); });
win.set_size_request(640, 480);
win.show_all();
view.connect("load-changed",function (instance,status)
{
let headers, response_STR="";
if (status == 3)
{
/* WebKitView.get_main_resource -> returns WebResource
WebResource.get_response -> returns URIResponse
URIResponse.get_http_headers -> returns Soup.MessageHeaders */
headers=view.get_main_resource().get_response().get_http_headers();
response_STR="";
headers.foreach ((name, value) => { response_STR+=name+": "+value+"\n"});
view.run_javascript('window.webkit.messageHandlers.pipe.postMessage(document.body.innerHTML);', null, null);
log (response_STR);
}
});
Gtk.main();
I'm currently using polidea's react-native-ble-plx library to do BLE scanning.
I do not want it to continue scanning, I just want to capture those scanned after a specified time limit.
Is there a way to do this?
Code:
export const scan = function scan() {
const subscription = DeviceManager.onStateChange((state) => {
if (state === 'PoweredOn') {
DeviceManager.startDeviceScan(null, null, (error, device) => {
if (error) {
console.log('error', error);
}
if (device !== null) {
console.log('device found ----> [id,name]', device.id, device.name);
}
});
subscription.remove();
}
}, true);
};
Output:
Output Image
I would do this simply by creating a timer variable outside the scope of this function, with each iteration of the scan callback handler checking to see how much time is passed, stopping the scanning if it is over a certain amount.
let startTime = new Date();
export const scan = function scan() {
const subscription = DeviceManager.onStateChange((state) => {
if (state === 'PoweredOn') {
DeviceManager.startDeviceScan(null, null, (error, device) => {
endTime = new Date();
var timeDiff = endTime - startTime; //in ms
// strip the ms
timeDiff /= 1000;
// get seconds
var seconds = Math.round(timeDiff);
if (error) {
console.log('error', error);
}
if (device !== null) {
console.log('device found ----> [id,name]', device.id, device.name);
}
if (seconds > 5) {
DeviceManager.stopDeviceScan(); //stop scanning if more than 5 secs passed
}
});
subscription.remove();
}
}, true);
};
I want to get the last deviceId.
Please try the following code on a smartphone.
https://www.ofima.ch/file1.html
Inside the function "getConnectedDevices" the variable deviceId ok.
But outside is returned a promise and not the variable deviceId.
How can I get the variable deviceId ?
Thanks
Miche
Explanation:
You need to wrap your alert in an async function and use await. Also to take the value from the promise you needed .then(). Hope the below helps.
Original code:
async function getConnectedDevices() {
var index;
const devices = await navigator.mediaDevices.enumerateDevices();
for (var i=0; i<devices.length; i++) {
if (devices[i].kind == "videoinput") {
index = i;
}
}
var deviceId = devices[index].deviceId;
alert('deviceId is ok: ' + deviceId);
return (deviceId);
}
const deviceId = getConnectedDevices();
alert('deviceId is not defined, why ?: ' + deviceId);
New code:
async function getConnectedDevices() {
let index;
const devices = await navigator.mediaDevices.enumerateDevices();
for (let i=0; i < devices.length; i++) {
console.debug(devices[i]);
if (devices[i].kind == "videoinput") {
index = i;
}
}
console.log('deviceId is ok: ', devices[index]);
return devices[index].deviceId;
}
(async() => {
const deviceId = await getConnectedDevices().then();
alert(`deviceId: ${deviceId}`);
})();
And a quick hack for storing the deviceId in the window
console.log('globalDeviceId should be undefined', window.globalDeviceObj);
async function getConnectedDevices() {
let index;
const devices = await navigator.mediaDevices.enumerateDevices();
for (let i = 0; i < devices.length; i++) {
console.debug(devices[i]);
if (devices[i].kind == "videoinput") {
index = i;
}
}
console.log('deviceId is ok', devices[index]);
return devices[index];
}
function getDeviceId() {
(async() => {
window.globalDeviceObj = await getConnectedDevices().then();
console.log(`globalDeviceId set: ${JSON.stringify(window.globalDeviceObj)}`);
})();
}
function tick() {
if(typeof window.globalDeviceObj === 'undefined'){
requestAnimationFrame(tick);
}else {
alert(`globalDeviceId get: ${JSON.stringify(window.globalDeviceObj)}, with deviceId: ${(window.globalDeviceObj.deviceId)}`)
}
}
function init() {
tick();
getDeviceId();
}
init();
I've created a Meteor method to upload a file, it's working well but until the file is fully uploaded, I cannot move around, all subscriptions seem to wait that the upload finishes... is there a way to avoid that ?
Here is the code on the server :
Meteor.publish('product-photo', function (productId) {
return Meteor.photos.find({productId: productId}, {limit: 1});
});
Meteor.methods({
/**
* Creates an photo
* #param obj
* #return {*}
*/
createPhoto: function (obj) {
check(obj, Object);
// Filter attributes
obj = filter(obj, [
'name',
'productId',
'size',
'type',
'url'
]);
// Check user
if (!this.userId) {
throw new Meteor.Error('not-connected');
}
// Check file name
if (typeof obj.name !== 'string' || obj.name.length > 255) {
throw new Meteor.Error('invalid-file-name');
}
// Check file type
if (typeof obj.type !== 'string' || [
'image/gif',
'image/jpg',
'image/jpeg',
'image/png'
].indexOf(obj.type) === -1) {
throw new Meteor.Error('invalid-file-type');
}
// Check file url
if (typeof obj.url !== 'string' || obj.url.length < 1) {
throw new Meteor.Error('invalid-file-url');
}
// Check file size
if (typeof obj.size !== 'number' || obj.size <= 0) {
throw new Meteor.Error('invalid-file-size');
}
// Check file max size
if (obj.size > 1024 * 1024) {
throw new Meteor.Error('file-too-large');
}
// Check if product exists
if (!obj.productId || Meteor.products.find({_id: obj.productId}).count() !== 1) {
throw new Meteor.Error('product-not-found');
}
// Limit the number of photos per user
if (Meteor.photos.find({productId: obj.productId}).count() >= 3) {
throw new Meteor.Error('max-photos-reached');
}
// Resize the photo if the data is in base64
if (typeof obj.url === 'string' && obj.url.indexOf('data:') === 0) {
obj.url = resizeImage(obj.url, 400, 400);
obj.size = obj.url.length;
obj.type = 'image/png';
}
// Add info
obj.createdAt = new Date();
obj.userId = this.userId;
return Meteor.photos.insert(obj);
}
});
And the code on the client :
Template.product.events({
'change [name=photo]': function (ev) {
var self = this;
readFilesAsDataURL(ev, function (event, file) {
var photo = {
name: file.name,
productId: self._id,
size: file.size,
type: file.type,
url: event.target.result
};
Session.set('uploadingPhoto', true);
// Save the file
Meteor.call('createPhoto', photo, function (err, photoId) {
Session.set('uploadingPhoto', false);
if (err) {
displayError(err);
} else {
notify(i18n("Transfert terminé pour {{name}}", photo));
}
});
});
}
});
I finally found the solution myself.
Explication : the code I used was blocking the subscriptions because it was using only one method call to transfer all the file from the first byte to the last one, that leads to block the thread (I think, the one reserved to each users on the server) until the transfer is complete.
Solution : I splitted the file into chunks of about 8KB, and send chunk by chunk, this way the thread or whatever was blocking the subscriptions is free after each chunk transfer.
The final working solution is on that post : How to write a file from an ArrayBuffer in JS
Client Code
// data comes from file.readAsArrayBuffer();
var total = data.byteLength;
var offset = 0;
var upload = function() {
var length = 4096; // chunk size
// adjust the last chunk size
if (offset + length > total) {
length = total - offset;
}
// I am using Uint8Array to create the chunk
// because it can be passed to the Meteor.method natively
var chunk = new Uint8Array(data, offset, length);
if (offset < total) {
// Send the chunk to the server and tell it what file to append to
Meteor.call('uploadFileData', fileId, chunk, function (err, length) {
if (!err) {
offset += length;
upload();
}
}
}
};
upload();
Server code
var fs = Npm.require('fs');
var Future = Npm.require('fibers/future');
Meteor.methods({
uploadFileData: function(fileId, chunk) {
var fut = new Future();
var path = '/uploads/' + fileId;
// I tried that with no success
chunk = String.fromCharCode.apply(null, chunk);
// how to write the chunk that is an Uint8Array to the disk ?
fs.appendFile(path, new Buffer(chunk), function (err) {
if (err) {
fut.throw(err);
} else {
fut.return(chunk.length);
}
});
return fut.wait();
}
});
Improving #Karl's code:
Client
This function breaks the file into chunks and sends them to the server one by one.
function uploadFile(file) {
const reader = new FileReader();
let _offset = 0;
let _total = file.size;
return new Promise((resolve, reject) => {
function readChunk() {
var length = 10 * 1024; // chunk size
// adjust the last chunk size
if (_offset + length > _total) {
length = _total - _offset;
}
if (_offset < _total) {
const slice = file.slice(_offset, _offset + length);
reader.readAsArrayBuffer(slice);
} else {
// EOF
setProgress(100);
resolve(true);
}
}
reader.onload = function readerOnload() {
let buffer = new Uint8Array(reader.result) // convert to binary
Meteor.call('fileUpload', file.name, buffer, _offset,
(error, length) => {
if (error) {
console.log('Oops, unable to import!');
return false;
} else {
_offset += length;
readChunk();
}
}
);
};
reader.onloadend = function readerOnloadend() {
setProgress(100 * _offset / _total);
};
readChunk();
});
}
Server
The server then writes to a file when offset is zero, or appends to its end otherwise, returning a promise, as I used an asynchronous function to write/append in order to avoid blocking the client.
if (Meteor.isServer) {
var fs = require('fs');
var Future = require('fibers/future');
}
Meteor.methods({
// Upload file from client to server
fileUpload(
fileName: string,
fileData: Uint8Array,
offset: number) {
check(fileName, String);
check(fileData, Uint8Array);
check(offset, Number);
console.log(`[x] Received file ${fileName} data length: ${fileData.length}`);
if (Meteor.isServer) {
const fut = new Future();
const filePath = '/tmp/' + fileName;
const buffer = new Buffer(fileData);
const jot = offset === 0 ? fs.writeFile : fs.appendFile;
jot(filePath, buffer, 'binary', (err) => {
if (err) {
fut.throw(err);
} else {
fut.return(buffer.length);
}
});
return fut.wait();
}
}
)};
Usage
uploadFile(file)
.then(() => {
/* do your stuff */
});