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4. Using events as triggers

Now that we have successfully implemented the Analytics client, our next goal is to leverage events fired by the events-example app as triggers for requests to the Analytics client. This approach ensures that with every event received, we make a corresponding request to the Analytics client, resulting in updated data for live product visualizations every 3 seconds.

Using the Analytics client as a event handler

As the Analytics client is already implemented, we can use it in our event handler function. First, in the service-course-template/node/event/liveUsersUpdate.ts file, import the client we implemented in the previous step and the EventContext from the @vtex/api package to access the Analytics client that is within the ctx object. Finally, use the getLiveUsers() method the Analytics client implements and log the fetched data.

service-course-template/node/event/liveUsersUpdate.ts

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import { Clients } from '../clients/index'
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import { EventContext } from '@vtex/api'
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export async function updateLiveUsers(ctx: EventContext<Clients>) {
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const liveUsersProducts = await ctx.clients.analytics.getLiveUsers()
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console.log('LIVE USERS: ', liveUsersProducts)
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return true
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}

Linking the app

Run vtex link. For every event fired, you should see the live users retrieved from the Analytics client.

service-course-template/node/event/liveUsersUpdate.ts
Terminal

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15:53:44.220 - info: App running service-node@6.38.1
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15:53:44.229 - info: Available service routes:
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https://myworkspace--myaccount.myvtex.com/_v/app/analytics/realTime service-node@6.38.1
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15:54:25.279 - info: [18:54:25.495Z] [72] myaccount/myworkspace:analytics 200 GET /_v/app/analytics/realTime 793 ms service-node@6.38.1
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15:54:44.772 - info: LIVE USERS: [
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{ slug: '1659', liveUsers: 4 },
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{ slug: '1837', liveUsers: 2 },
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{ slug: '1438', liveUsers: 1 },
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{ slug: '1204', liveUsers: 1 },
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{ slug: '1542', liveUsers: 2 },
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{ slug: '1352', liveUsers: 1 },
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{ slug: '1168', liveUsers: 3 },
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{ slug: '1821', liveUsers: 1 }
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] service-node@6.38.1

Using the Analytics client as a event handler

As the Analytics client is already implemented, we can use it in our event handler function. First, in the service-course-template/node/event/liveUsersUpdate.ts file, import the client we implemented in the previous step and the EventContext from the @vtex/api package to access the Analytics client that is within the ctx object. Finally, use the getLiveUsers() method the Analytics client implements and log the fetched data.

Linking the app

Run vtex link. For every event fired, you should see the live users retrieved from the Analytics client.

service-course-template/node/event/liveUsersUpdate.ts

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import { Clients } from '../clients/index'
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import { EventContext } from '@vtex/api'
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export async function updateLiveUsers(ctx: EventContext<Clients>) {
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const liveUsersProducts = await ctx.clients.analytics.getLiveUsers()
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console.log('LIVE USERS: ', liveUsersProducts)
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return true
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}

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