Listing MySQL HeatWave Instances - Using the Oracle Cloud TypeScript SDK Part 1

This post is the first in a series that will demonstrate how to view and manage MySQL HeatWave instances in Oracle Cloud Infrastructure (OCI). Oracle offers several SDKs that can be used to view and manage resources in OCI. In this post, we will discuss how to leverage the TypeScript/JavaScript SDK to retrieve a list of MySQL HeatWave instances for a given compartment.

Prerequisites

To use the OCI SDKs, you need credentials for an OCI account with the proper permissions. While it is not necessary to install the OCI CLI, following the instructions at this post will create the same files we will need to use the SDK…with the added advantage of installing the CLI.

To follow along with this demo, you should also have Node.js installed. I am using version 21.5.0.

Creating the Node App

Before we dive into accessing the SDK, there is some setup and config we need to take care of.

Initialize the Node App

Create a directory to hold your code, open a terminal/command window, and cd into that new folder. To initialize a Node app, run the following command:

npm init

You will be prompted for information about the project. For this demo, feel free to accept all the default values.

When the init script completes, you should see a file named package.json in your directory. Here is what mine looks like.

{
  "name": "oci-demo",
  "version": "0.0.1",
  "description": "A demo of using the OIC SDK for TypeScript",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Scott Stroz",
  "license": "MIT"
}

Install the Necessary Modules

Next, we install the Node modules we will need. You can install these modules using the command:

npm install oci-mysql bunyan dotenv

This command will install the oci-mysql, dotenv, and express modules.

The oci-mysql module contains the parts of the SDK that are specific to MySQL HeatWave instances. This includes dependencies to other modules such as oci-common.

The bunyan module is a JSON logging library for Node.js. I had to add this because I was getting errors while trying to run the code for this demo. I guess that there is a missing dependency somewhere. Installing bunyan separately addressed my issues.

The dotenv module allows us to use environment variables for information we will use in our demo.

Set up .env

In this example, we only need one environment variable, the OCID of the compartment we will use. Create a file named .env and then add a variable named COMPARTMENT_ID and give it the value of the compartment you want to use. It should look like the text below.

COMPARTMENT_ID=ocid1.compartment.oc1..a{more text here}

Using the SDK

To get started using the SDK, let’s create a file named index.mjs in the root of our project. We are using the .mjs file extension because I prefer to use import statements, and by using .mjs, we can do that with no other configuration. We could use .js, but then we need to update package.json to include "type": "module".

At the top of the file, we must import the modules we will use. After we import the dotenv module, we call dotenv.config() to grab the environment variables.

import common from 'oci-common'
import * as mysql from 'oci-mysql'
import * as dotenv from 'dotenv'

dotenv.config()

Let’s create a function named main() that we will run when the script loads.

const main = async () => {
    
}

We use async here because some to the calls we will make using the SDK are asynchronous.

Next, we need to create an authentication provider. In this demo we will use a provider that reads the OCI config file created when we installed the OCI CLI. By default, the provider uses the config file located at ~/.oci/config and the DEFAULT config block if more than one block is specified. Add the following code to the main() function.

const provider = new common.ConfigFileAuthenticationDetailsProvider()

Once we have our authentication details provider, we create an instance of the MySQL DbSystemClient. Add the code below under the code we just added to main().

const systemClient = new mysql.DbSystemClient({ authenticationDetailsProvider: provider })

Now, we grab the COMPARTMENT_ID variable from the environment. Add the following code to the bottom of the main() function.

const compartmentId = process.env.COMPARTMENT_ID

Continuing in the main() function, we must create a configuration object for our request to list MySQL HeatWave Systems.

const systemListConfig = {
    compartmentId: compartmentId,
    limit: 5,
    sortBy: mysql.requests.ListDbSystemsRequest.SortBy.DisplayName,
    sortOrder: mysql.requests.ListDbSystemsRequest.SortOrder.Asc,
}

Let’s break down the properties of this object:

• compartmentId - is the OCID of the compartment we want to list MySQL HeatWave instances from.
• limit - is the maximum number of systems that will be returned. In this demo we limit it to 5.
• sortBy - is the property by which the result will be sorted. Here, we are sorting by the displayName property.
• sortOrder - is the direction we want to sort. This example shows we are sorting ascending.

We are now ready to call the SDK to get the list of MySQL HeatWave instances. That is handled by the code below.

const result = await systemClient.listDbSystems(systemListConfig)

To view the list of systems, we can do a console.log() of the result variable.

console.log(result)

Lastly, add a call to main() at the bottom of the file.

main()

When we are done with this file, it should look like the code below:

import common from 'oci-common'
import * as mysql from 'oci-mysql'
import * as dotenv from 'dotenv'

dotenv.config()

const main = async () =>{
    const provider = new common.ConfigFileAuthenticationDetailsProvider()
    const systemClient = new mysql.DbSystemClient({ authenticationDetailsProvider: provider })
    const compartmentId = process.env.COMPARTMENT_ID

    const systemListConfig = {
        compartmentId: compartmentId,
        limit: 100,
        sortBy: mysql.requests.ListDbSystemsRequest.SortBy.DisplayName,
        sortOrder: mysql.requests.ListDbSystemsRequest.SortOrder.Asc,
    }

    const result = await systemClient.listDbSystems(systemListConfig)
    console.log(result)
}

main()

Running the Code

To run the code, open a terminal/command window in the project folder and run the command:

node index.mjs

In the console, you will see the output of our call to listDbSystems(). Mine resembles the output below.

{
  items: [
    {
      id: 'ocid1.mysqldbsystem.oc1.{more text}',
      displayName: 'OCI-SDK-Demos',
      description: 'A HeatWave instance to demonstrate the SDK',
      compartmentId: 'ocid1.compartment.oc1..{more text}',
      isHighlyAvailable: false,
      currentPlacement: [Object],
      isHeatWaveClusterAttached: false,
      heatWaveCluster: undefined,
      availabilityDomain: 'mMVr:US-ASHBURN-AD-2',
      faultDomain: 'FAULT-DOMAIN-2',
      availabilityPolicy: [Object],
      endpoints: [Array],
      lifecycleState: 'ACTIVE',
      mysqlVersion: '8.0.35',
      timeCreated: '2024-01-09T19:45:05.250Z',
      timeUpdated: '2024-01-18T17:43:34.382Z',
      deletionPolicy: [Object],
      freeformTags: [Object],
      definedTags: [Object],
      backupPolicy: [Object],
      shapeName: 'MySQL.VM.Standard.E4.1.8GB',
      crashRecovery: 'ENABLED',
      databaseManagement: 'ENABLED'
    }
  ],
  opcRequestId: 'B4474140CAA4-11EE-8901-5F5511ACB/BC7C95DED0AAB03E11A5B376FBD778F0/8473630587AC860F42CD44E00F92F361'
}

As you can see, we can retrieve a lot of data about our MySQL HeatWave instances. The properties that interested me the most are:

• lifecycleState - This indicates the state of the instance. Values can be ACTIVE, INACTIVE, UPDATING, or DELETED. There other states, but those are the ones you will see most often.
• id - This is the id of the instance. If we wanted to get information about just this instance, we would use a different endpoint in the SDK and pass this value. We can also programmatically use this value to start, stop, or delete an instance.
• mysqlVersion - This indicates what version of MySQL is used by this instance.
• shapeName - This tells us what shape the instance was based on.

There is also information about where the instance resides (currentPlacement), the deletion and backup policies (deletionPolicy and backupPolicy respectively), and whether crash recovery (crashRecovery) and database management (databaseManagement) are enabled or not.

The Wrap-Up

As we can see, the TypeScript/JavaScript OCI SDK allows us to view information about our MySQL HeatWave instances. In future posts, we will discuss starting and stopping MySQL HeatWave instances and viewing/managing backups, replicas, and replication channels.

Photo by Kelly Sikkema on Unsplash