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Care Pet ScyllaDB IoT example

This example project demonstrates a generic IoT use case for ScyllaDB in PHP.

Here you will find a list of possible drivers to integrate with.

PHP Version Driver
PHP 7.1 DataStax PHP Driver
PHP 8.2 [x] ScyllaDB PHP Driver (dev)

The documentation for this application and the guided exercise is here.

Quick Start

The application allows the tracking of the pets health indicators, and it consists in a CLI of three parts:

Command Description
php scylla migrate creates the carepet keyspace and tables
php scylla simulate generates a pet health data and pushes it into the storage
php scylla serve REST API service for tracking pets health state

Prerequisites:

Setup

To run a local ScyllaDB cluster consisting of three nodes and the PHP Workspace with the help of docker and docker-compose execute:

$ docker-compose up -d

Docker-compose will spin up three nodes which are:

  • carepet-scylla1
  • carepet-scylla2
  • carepet-scylla3

If you want to see your containers running, run the docker ps command, and you should see something like this:

$ docker ps
CONTAINER ID   IMAGE                    COMMAND                  CREATED       STATUS       PORTS                                                                      NAMES
14a656685517   care-pet-php-workspace   "/bin/sh -c /bin/bas…"   1 minute ago   Up 1 minute   9000/tcp                                                                   workspace-php
4e351dfe3987   scylladb/scylla          "/docker-entrypoint.…"   1 minute ago   Up 1 minute   22/tcp, 7000-7001/tcp, 7199/tcp, 9042/tcp, 9160/tcp, 9180/tcp, 10000/tcp   carepet-scylla2
9e7e4d3992df   scylladb/scylla          "/docker-entrypoint.…"   1 minute ago   Up 1 minute   22/tcp, 7000-7001/tcp, 7199/tcp, 9042/tcp, 9160/tcp, 9180/tcp, 10000/tcp   carepet-scylla3
7e2b1b94389b   scylladb/scylla          "/docker-entrypoint.…"   1 minute ago   Up 1 minute   22/tcp, 7000-7001/tcp, 7199/tcp, 9042/tcp, 9160/tcp, 9180/tcp, 10000/tcp   carepet-scylla1

If you have any error regarding "premature connection", restart your docker instance and wait a minute until your ScyllaDB connection be established.

... and it will also create the php-workspace, where your web server will run. You can access them with the docker command.

Useful Commands

Here's a list of everything that you can execute and make your own research through the application.

PHP Application Commands

These commands you can execute by entering the container or through docker exec remotely:

Entering App Container:
$ docker exec -it workspace-php bash
root@14a656685517:/var/www# php scylla migrate
Initializing Database:
$ docker exec -it workspace-php php scylla migrate
[INFO] Fetching Migrations... 
[INFO] Migrated: /var/www/migrations/1-create_keyspace.cql 
[INFO] Migrated: /var/www/migrations/2-create_owner_table.cql 
[INFO] Migrated: /var/www/migrations/3-create_pets_table.cql 
[INFO] Migrated: /var/www/migrations/4-create_sensors_table.cql 
[INFO] Migrated: /var/www/migrations/5-create_measurements_table.cql 
[INFO] Migrated: /var/www/migrations/6-create_sensor_avg_table.cql 
[INFO] Done :D
Starting Web Server:
$ docker exec -it workspace-php php scylla serve
[INFO] CarePet Web started!
[INFO] Development Server: http://0.0.0.0:8000
[Thu Jan  5 17:32:01 2023] PHP 7.4.33 Development Server (http://0.0.0.0:8000) started
Simulate Environment Sensors:
$ docker exec -it workspace-php php scylla simulate
[INFO] Starting Sensor simulator... 
[INFO] Batch: 0
[INFO] Owner 593dec12-6bea-3c93-8f49-26d8b6d589b1 
[INFO] Pet: 14d9f304-5600-34af-8622-3d4505d617d7 | Owner 593dec12-6bea-3c93-8f49-26d8b6d589b1
[INFO] Sensor: 869bd01e-e0ba-364f-bbfb-8c7c496a3318 (R) | Pet 14d9f304-5600-34af-8622-3d4505d617d7 
[INFO] Sensor: c86f63b0-1439-3404-8750-b71b90a685cb (L) | Pet 14d9f304-5600-34af-8622-3d4505d617d7 
[INFO] Sensor: e0550426-8832-3d17-9025-77726b3009c5 (P) | Pet 14d9f304-5600-34af-8622-3d4505d617d7 
[INFO] Sensor: bf960c81-8e0f-3012-b50d-18596b50db18 (P) | Pet 14d9f304-5600-34af-8622-3d4505d617d7 
[INFO] Sensor: 933245de-812e-34e4-8d50-2ab072726217 (T) | Pet 14d9f304-5600-34af-8622-3d4505d617d7 
[INFO] Pet: 319ec566-d6b0-3868-ac5e-76253ee7c236 | Owner 593dec12-6bea-3c93-8f49-26d8b6d589b1
[INFO] ...

ScyllaDB Commands

Running Nodetool:
$ docker exec -it carepet-scylla1 nodetool status
=======================
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns    Host ID                               Rack
UN  10.10.5.2  212 KB     256          ?       f6121e15-48df-4b31-b725-3ad2795b8b94  rack1
UN  10.10.5.3  1.06 MB    256          ?       871795f3-67d2-47ba-83ef-15714b89c02a  rack1
UN  10.10.5.4  1.06 MB    256          ?       cbe74a63-2cf4-41c2-bf7f-c831c0d2689f  rack1
Running Container Shell:
$ docker exec -it carepet-scylla1 bash

   _____            _ _       _____  ____
  / ____|          | | |     |  __ \|  _ \
 | (___   ___ _   _| | | __ _| |  | | |_) |
  \___ \ / __| | | | | |/ _` | |  | |  _ <
  ____) | (__| |_| | | | (_| | |__| | |_) |
 |_____/ \___|\__, |_|_|\__,_|_____/|____/
               __/ |
              |___/
Nodetool:
        nodetool help
CQL Shell:
        cqlsh
More documentation available at:
        http://www.scylladb.com/doc/

root@7e2b1b94389b:/#
Inspecting a Container

You can inspect any node using the docker inspect command as follows. For example:

$ docker inspect carepet-scylla1
[
    {
        "Id": "7e2b1b94389b36c494093db8e119c2b8c5167339f20e03d9bfa070e8e46f8430",
        "Created": "2023-01-05T17:36:59.038609825Z",
        "Path": "/docker-entrypoint.py",
        "Args": [
            "--smp",
            "1"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false
            ...
        }
    }
]
Get Node IP Address:
$ docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' carepet-scylla1
10.10.5.2
Entering CQLSH (Database)
$ docker exec -it carepet-scylla1 cqlsh
Connected to  at 10.10.5.2:9042.
[cqlsh 5.0.1 | Cassandra 3.0.8 | CQL spec 3.3.1 | Native protocol v4]
Use HELP for help.
cqlsh>
cqlsh
> DESCRIBE KEYSPACES
carepet  system_schema  system_auth  system  system_distributed  system_traces

cqlsh
> USE carepet;
cqlsh
:carepet> DESCRIBE TABLES
pet  sensor_avg  gocqlx_migrate  measurement  owner  sensor

cqlsh
:carepet> DESCRIBE TABLE pet
CREATE TABLE carepet.owner
(
    owner_id uuid PRIMARY KEY,
    address  text,
    name     text
) WITH bloom_filter_fp_chance = 0.01
      AND caching = {'keys': 'ALL', 'rows_per_partition': 'ALL'}
      AND comment = ''
      AND compaction = {'class': 'SizeTieredCompactionStrategy'}
      AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
      AND crc_check_chance = 1.0
      AND dclocal_read_repair_chance = 0.0
      AND default_time_to_live = 0
      AND gc_grace_seconds = 864000
      AND max_index_interval = 2048
      AND memtable_flush_period_in_ms = 0
      AND min_index_interval = 128
      AND read_repair_chance = 0.0
      AND speculative_retry = '99.0PERCENTILE';

cqlsh
:carepet> exit

Architecture

Pet --> Sensor --> ScyllaDB <-> REST API Server <-> User