Using a snap-in to perform a DevRev action

Installation guide

• Install DevRev CLI
• Install jq
• Install DevRev SDK

$
devrev profiles authenticate -o <dev-org-slug> -u <youremail@yourdomain.com>

$
devrev snap_in_version init

Trigger

The trigger condition for the snap-in is dictated by the Event Sources section in the manifest. The timer-events event source is suitable for the use-case, since it allows trigger of snap-ins using CRON expression.

Action

The hello-world snap-in prints a log message whenever the snap-in is triggered. Here, the snap-in should create a work-item of type ticket when triggered. To do that, use the DevRev TypeScript SDK to make API calls for creating the ticket.

Creating the snap-in

Updating the manifest

Update the manifest file to reflect the objective. Update the name, the description, and the service account’s display name to better reflect the snap-in’s behavior.

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version: "2"
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name: "Timely Ticketer"
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description: "Snap-in to create ticket every 10 minutes"
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service_account:
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    display_name: Automatic Ticket Creator Bot

Next, update the event_sources section to use the timer-events event source. The timer-events source type takes a config of type cron or interval_seconds as mentioned in the documentation. The cron config is used here.

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event_sources:
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    organization:
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        - name: timer-event-source
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          description: Event source that sends events every 10 minutes.
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          display_name: Timer Event Source
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          type: timer-events
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          config:
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            # CRON expression for triggering every 10 minutes.
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            cron: "*/10 * * * *"
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            metadata:
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                event_key: ten_minute_event

Finally, update the function name to better reflect the behavior and automationname to use the event type corresponding to the timer-events event source.

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functions:
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    - name: ticket_creator
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      description: Function to create a new ticket when triggered.
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automations:
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    - name: periodic_ticket_creator
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      description: Automation to create a ticket every 10 minutes
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      source: timer-event-source
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      event_types:
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        - timer.tick
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      function: ticket_creator

After these changes, the final version of the manifest can be found here.

Renaming the function

Next, the function name in the src/functions folder needs to be renamed to ‘ticket_creator’ which is the one put in the manifest.

src/functions/on_work_created => src/functions/ticket_creator

These changes need to be reflected in the following files as well:

• src/function-factory.ts
• src/test-runner/example.test.ts
• src/functions/ticket_creator/index.test.ts

Event received by the snap-in function

In the hello-world snap-in, the ID of the created work-item gets extracted from the input event as such.

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console.info(
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  `The work ${events[0].payload.work_created.work.id} has been created.`
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);

The schema for a event received by the snap-in is:

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{
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 payload:Record<string,any>
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 context: {
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    "dev_oid": string,
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    "source_id":string,
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    "snap_in_id": string,
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    "snap_in_version_id":string,
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    "service_account_id":string,
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    "secrets": {
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        "service_account_token": [SECRET],
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        ...
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    },
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 },
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 execution_metadata: {
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    "request_id":string,
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    "function_name": string,
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    "event_type": string,
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    "devrev_endpoint": string
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 },
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 input_data: {
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    "global_values": Record<string,string>,
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    "event_sources":Record<string,string>,
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    "keyrings":Record<string,string>,
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    "resources": Record<string,string>
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 }
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}

The payload differs by the event_source and the event_type received. There are two fields to be concerned about in the input payload:

1. devrev_endpoint the endpoint of the API call.
2. service_account_token which is a short-lived token provisioned by each snap-in. This is required when making API calls to DevRev.

Updating the code

Update the code in src/functions/ticket_creator/index.ts to reflect the behavior.

Firstly, import the DevRev TypeScript SDK in the index.ts file

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import {client, publicSDK} from "@devrev/typescript-sdk";

Next, update the run function in the hello-world example. Since the ticket gets created frequently, set some creation time in the title and the body. The example uses the part as PROD-1 and keeps the owner as DEVU-1. Feel free to edit those values to actual IDs for parts and users in your dev org.

The complete index.ts file looks like this

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import { client, publicSDK } from "@devrev/typescript-sdk";
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export const run = async (events: any[]) => {
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  for (const event of events) {
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    const endpoint = event.execution_metadata.devrev_endpoint;
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    const token = event.context.secrets.service_account_token;
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    // Initialize the public SDK client
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    const devrevSDK = client.setup({ endpoint, token });
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    // Create a ticket. Name the ticket using the current date and time.
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    const date = new Date();
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    const ticketName = `Ticket created at ${date.toLocaleString()}`;
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    const ticketBody = `This ticket was created by a snap-in at ${date.toLocaleString()}`;
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    const response = await devrevSDK.worksCreate({
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      title: ticketName,
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      body: ticketBody,
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      // The ticket is created in the PROD-1 part. Rename this to match your part.
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      applies_to_part: "PROD-1",
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      // The ticket is owned by the DEVU-1 user. Rename this to match the required user.
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      owned_by: ["DEVU-1"],
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      type: publicSDK.WorkType.Ticket,
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    });
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    console.log(response);
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  }
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};
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export default run;

Deploying the snap-in to your organization

Once satisfied with the code changes, move to the code folder, and run

$
npm install
>
>
npm run build
>
>
npm run package

This builds and packages your snap-in and creates a build.tar.gz. The tar.gz and manifest.yaml file is used when creating the snap-in version.

Steps for deploying this snap-in have been discussed in the Getting Started section.