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Build simple web interface for redis key/value store

2 posts in this topic

This is my second post for php based projects. My first thread is about an IoT plattform for Ardunio clients.

This post is about creating a simple web interface for a redis key/value store. If you want to install your own redis database you can use this tutorial: 

I will use following php frameworks to get the rest interface done: Slim, CorSlim, Predis.

All the server and client code will be available at github: https://github.com/wlanboy/php-redis-rest-service

a) Server

We first have to enable CORS support to enable clients of other domains to use our service:

require ('CorsSlim/CorsSlim.php');
$app->add(new \CorsSlim\CorsSlim());

$corsOptions = array(
    "origin" => "*",
    "exposeHeaders" => array("Content-Type", "X-Requested-With", "X-authentication", "X-client"),
    "allowMethods" => array('GET', 'POST', 'PUT', 'DELETE', 'OPTIONS')
$cors = new \CorsSlim\CorsSlim($corsOptions);

After that we have to get a connection to our local redis instance:

$app->container->singleton('redisclient', function() {
	$client = new Predis\Client('tcp://');
    return $client;

And define the routes:

//Redis routes
$app->get('/key/:id', 'getKey');
$app->post('/key', 'addKey');

And implement them with the help of the Predis framework:

function getKey($id) {
	$app = \Slim\Slim::getInstance();
	$client = $app->redisclient;
    try {
	$value = $client->get($id);
	$temp = (object) [
		$id => $value
    	echo json_encode($temp);
    } catch(PDOException $e) {
        echo '{"error":{"text":'. $e->getMessage() .'}}';

Done :-)

b) Client

I use a simple Ajax JS script for the client. The most simple way to create the GET and POST requests.

We first defien a data object which is able to create JSON output:

function KeyValue(key, value) {
	var kv = {"key":key, "value":value};
    kv.toJsonString = function () { return JSON.stringify(kv); };
	return kv;

And a simple send method that reads form data, sends it to the rest service and prints the response:

function sendMessage() {
var key = document.getElementById("postkey").value;
var value = document.getElementById("postvalue").value;

	if (value == "") {
			type: "GET",
			url: "https://rest-api/key/"+key,
			contentType: "application/json; charset=utf-8",
				 success: function (data, status, jqXHR) {
					 output = document.getElementById("output");
					 output.innerHTML = JSON.stringify(data);

				 error: function (jqXHR, status) {
					 output = document.getElementById("output");
					 output.innerHTML = status;

Using GetElementByID + value to get the input.
Creating a jQuery ajax request and add the key to the url to get the variable stored in redis.

Same with the POST request to store the value of a variable in redis:

		var contact = KeyValue(key,value);
			type: "POST",
			url: "https://rest-api/key",
			contentType: "application/json; charset=utf-8",
			data: contact.toJsonString(),
				 success: function (data, status, jqXHR) {
					 output = document.getElementById("output");
					 output.innerHTML = JSON.stringify(data);

				 error: function (jqXHR, status) {
					 output = document.getElementById("output");
					 output.innerHTML = status;
					 output.innerHTML += "<br/>";
					 output.innerHTML += jqXHR.responseJSON;


This time with a data line to get the JSON data of the contact element.

Same JSON.stringify to get the string representation of the json object.


Simple server & client example to use a redis database without any binary client. Simple HTTP requests to use the redis service.
I will add additional methods to the rest service to add the other redis commands too.

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