I have a server client application. In this my server is php based application on a central location and clients are local servers developed in php and located at individual machine.
I have aGUI on my central server where i selects the local clients and sends the string message to them using webservice which is their on each local machine. Currently it is like when i clicks on send button it takes ip of each local machine from database and calls the webservice in for loop but it takes lots of time for looping if i selects more local clients. So how can i tell my central server to do this work in background
You can use a job queue like BeanStalk
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I need to create an application using php which is hosted in a server and need to communicate with a csv file located in clients local machine. Is there any way we could do this ? How can I connect to a remote csv file ? Is this possible ?
Server machine accessing a csv file directly from a client machine is not a good idea. It's a security threat indeed. Consider you are navigating some website and it's server is able to access your computer's file system!!!
There are various alternatives to achieve this, some of these might be:
Make the user upload csv files to server in order to make it
available to the server application
If the client and server are in the same network, then share the
folder on client machine to make it accessible from the server
etc... I would have preferred the first option as mentioned above.
As #AnthonyB mentioned in comment under your question, server can't directly call client, and that is true. Server is called "server" as it serves requests from the client.
To be able to give away files to remote requests, your client needs its own server application, like Apache HTTPD for example.
In case if you need continuously request client's server to collect files with your PHP server, what you are looking for called "worker". One of AWS tools called Elastic Beanstalk offers possibility to choose a server or a worker application during start up wizard for PHP. It is pretty straight forward and easy to use.
Please note, that your client must have dedicated IP address or use Dynamic DNS approach by pushing its IP to a DB (or directly to a server) where worker will take it from.
If you don't need dedicated worker, you can configure CRON JOB to send requests to clients server applications.
IMHO, all that scenario worth it only if you are building corporate grade application. In most cases (and if you do REALLY need to collect files from clients) you have to install Apache + PHP server on the client side and make this guys to wait for request from YOUR remote php server. Without it, you can not get files from clients computers via browser without user input interactions. At least legally :)
I developed a scan app with phonegap which scans a code, then does an Ajax call to my website which let's the app know whether or not the code is valid (this info is stored in a mysql database).
Now, I want the same functionalities, but on a local network. So I have a computer running a local server using xampp.
It should be possible to take this setup and place it on a different location (so the ip of the computer can change or should be locked or something).
Anyone who can point me in the right direction, I'm pretty clueless...
Having a simple PHP script running on a web server in my local network, how can I auto discover this script (or better the server hosting the script) using an external client (e.g., an Android app).
I am aware that this will not be possible with a pure PHP script hosted on a web server. I need to bind a socket to the broadcast address 255.255.255.255 or some multicast address.
Maybe a python script could do, e.g., http://stuvel.eu/blog/186/start-xbmc-from-remote
Apache ZooKeeper seems interesting but too big and complicated at the same time.
What other options are their? Does some of the "big" web servers provide some kind of easy to use service discovery?
I have a PHP/MySQL application running with WAMP on a local server. This application contains sensitive and confidential data that can only be accessed from devices on the network in the office.
However, this application generates reports that clients should be able to access from the web from an entirely separate application running on a LAMP stack.
Currently, I have the reports transferring via SFTP from the local server to the web based server.
My question is, how can I update the remote database from the local application securely, and so that the MySQL db can only be modified by the localhost of the remote application and the server running the local application?
I'm thinking about creating some kind of API that only accepts data from the IP of the local app, but I do not know the best practices for this, nor do I know how to start going about it.
MySQL provides a USER > FROM HOST > PER DATABASE > PER TABLE > PER COLUMN grant system.
Meaning that you can specify which user can connect from which host to which database,... Make usage of the FROM HOST feature.
I want to control a robot from the web, the robot is connected to Android device. The operation will be as the following :
a web application written using JavaScript and HTML runs on desktop computer which takes the keyboard input from the user and send them to the android device connected to the robot.
the android device receive the commands and then send them to Arduino board which used to control the robot.
But how should I deliver the data to the Android device which doesn't has a static IP address?
I have two approaches to solve that :
the JavaScript application sends the keyboard input to a web server runs PHP and MySQL , then the php application store the data on the MySQL database. An application runs on Android connected to that web server and extract the data from the MySQL database.
the JavaScript sends the data to the web server. The android application connected to the web server receives the data directly so the web server is just used as a relay.
The first approach is easy to do but its slow , so my question is...
How to implement the second approach and which web technologies should I use to implement it? And how to make the web server works as relay between two sides?
PS : I am planning to use 000webhost.com as web server. so I will not use my own server
You can either have your Android application poll the webserver for outstanding commands. This is a little inefficient in terms of data usage, but if you're on an unlimited 3G plan / wi-fi, you could live with it. It will be very easy to implement.
Alternatively, set up a TCP server on your server, and have your Android application open a socket connection with the server. This way, your web application can send commands to the server which will immediately stream them to the Android device. It will be slightly harder to implement, but will be more efficient and robust if done right.
PS - Most shared servers don't allow you to open a TCP server on your host so you might be forced to go with the first option.
PPS - I wasn't aware of Google Cloud Messaging. It seems to be a good solution for you what you're attempting to achieve. You should have a look into it.