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const { PubSub } = require('@google-cloud/pubsub')
const GoogleCloudAdapter = require('../GoogleCloudAdapter')
const { ErrorUtils } = require('../../../utils/error')
const $error = new ErrorUtils()
type TConstructorProps = {
projectId: string | boolean
}
type TPubSubPublish = {
topic: string
message: string | Record<string, any>
}
export class PubSubAdapter extends GoogleCloudAdapter {
constructor(props?: TConstructorProps) {
super()
this.pubsub
if (props?.projectId) {
this.pubsub = new PubSub({ projectId: props.projectId })
} else {
this.pubsub = new PubSub()
}
}
createTopic = async (name: string) => {
try {
const [exists] = await this.pubsub.topic(name).exists()
if (!exists) {
await this.pubsub.createTopic(name)
}
return true
} catch (error) {
throw $error.errorHandler({ error })
}
}
getTopics = async () => {
try {
let response: Record<string, any>[] = []
const [topics] = await this.pubsub.getTopics()
for (let topic of topics) {
response.push(topic)
}
return response
} catch (error) {
throw $error.errorHandler({ error })
}
}
getTopic = async (name: string) => {
try {
const [topic] = await this.pubsub.topic(name)
return topic
} catch (error) {
throw $error.errorHandler({ error })
}
}
deleteTopic = async (name: string) => {
try {
const [exists] = await this.pubsub.topic(name).exists()
if (exists) await this.pubsub.topic(name).delete()
return true
} catch (error) {
throw $error.errorHandler({ error })
}
}
publishMessage = async (props: TPubSubPublish) => {
try {
let { topic, message } = props
let dataBuffer
if (typeof message === 'string') {
dataBuffer = Buffer.from(message)
} else {
dataBuffer = Buffer.from(JSON.stringify(message))
}
const messageId = await this.pubsub
.topic(topic)
.publishMessage({ data: dataBuffer })
return messageId
} catch (error) {
throw $error.errorHandler({ error })
}
}
}
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