QuestDB wrapper

Simple PHP QuestDB PHP client using Influx Line Protocol.

Formats ILP query string regarding QuestDB datatypes provided

Requirements

PHP 7+ server with sockets extension enabled.

Install

Clone this repository or use composer

composer require loranger/questdb-client

Usage

\QuestDB\Client wrapper is provided as a singleton class.

Server config

Call the setServer method to define your QuestDB host.

\QuestDB\Client::setServer('questdb_server', 9009);

Sending datas

You can send datas to your QuestDB server using the ping method, by providing an ILP query string or an associative array

ILP syntax

Use the ILP syntax to send your datas

\QuestDB\Client::ping('trades,symbol=BTC-USD,side=sell');

ILP Query Builder

You can use the ILP Query Builder to generate query string from array values

new \QuestDB\ILPQueryBuilder(string $table, array $values, int $timestamp = null);

$ilp_query = new \QuestDB\ILPQueryBuilder('trades', [
    'symbol' => 'BTC-USD',
    'side' => 'sell'
]);

echo $ilp_query;
// trades,symbol=BTC-USD,side=sell

\QuestDB\Client::ping($ilp_query);

The ping method is compliant with the ILPQueryBuilder constructor signature, so you can directly pass the argument to the ping method

\QuestDB\Client::ping('trades', [
    'symbol' => 'BTC-USD',
    'side' => 'sell'
], time());

The given values are automatically considered as symbol datatypes, but you can specify any QuestDB type if you need more precision:

\QuestDB\Client::ping('trips', [
    'cab_type:symbol' => 'yellow',
    'passenger_count:int' => 3,
    'trip_distance:double' => 6.3,
    'payment_type' => 'cash',
]);

which will build the same IPL query as

echo (new \QuestDB\ILPQueryBuilder('trips', [
    'cab_type:symbol' => 'yellow',
    'passenger_count:int' => 3,
    'trip_distance:double' => 6.3,
    'payment_type' => 'cash',
]));

// trips,cab_type=yellow,payment_type=cash passenger_count=3i,trip_distance=6.300000

Docker

A docker compose file is provided in order to run a local short demo along with a questdb server.

The container is composed by:

• a php 7 image (locally build with its sockets extensions)
• a composer image inherited from php image
• a pest image inherited from php image
• a dockerized questdb server

The PHP image runs the builtin server and expose the port 80 (but can also be used with traefik).

The composer image should exit as soon as the container starts. It only provides a convenient shortcut to run composer command within the container: docker-compose run --rm composer show --platform

The pest image is a shortcut to the composer locally installed pest binary. It provides a shortcut to run tests: docker-compose run --rm pest --version

The questdb image runs the latest official docker image and exposes ports 9000 and 9009 (but can also be used with traefik).

cp .env.example .env
cp docker-compose.example docker-compose.yml
docker compose up