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# @welshman/dvm
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[](https://npmjs.com/package/@welshman/dvm)
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`@welshman/dvm` is a comprehensive package for building and interacting with Data Vending Machines (DVMs) in the Nostr ecosystem. It provides both server-side DVM implementation capabilities and client-side request handling.
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## What is a DVM?
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@@ -10,6 +12,90 @@ A Data Vending Machine (DVM) is a Nostr service that:
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- Responds with new events containing processed data
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- Optionally provides progress updates during processing
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# Request example
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```typescript
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import {makeDvmRequest, DVMEvent} from '@welshman/dvm'
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const req = makeDvmRequest({
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// Create and sign a dvm request event, including any desired tags
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event: createAndSign({kind: 5300}),
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// Publish and subscribe to these relays
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relays: ['wss://relay.damus.io', 'wss://dvms.f7z.io'],
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// Timeout defaults to 30 seconds
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timeout: 30_000,
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// Auto close on first result (defaults to true)
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autoClose: true,
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// Listen for and emit `progress` events
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reportProgress: true,
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})
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// Listen for progress, result, etc
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req.emitter.on(DVMEvent.Progress, (url, event) => console.log(event))
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req.emitter.on(DVMEvent.Result, (url, event) => console.log(event))
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```
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# Handler example
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```typescript
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import {bytesToHex} from '@noble/hashes/utils'
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import {generateSecretKey} from 'nostr-tools'
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import {createEvent} from '@welshman/util'
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import {subscribe} from '@welshman/net'
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import {DVM} from '@welshman/dvm'
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// Your DVM's private key. Store this somewhere safe
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// const hexPrivateKey = bytesToHex(generateSecretKey())
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const hexPrivateKey = '9cd387a3aa0c1abc2ef517c8402f29c069b4174e02a426491aec7566501bee67'
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// Tags that we'll return as content discovery suggestions
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const tags = []
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// Populate the tags with music by Ainsley Costello
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const sub = subscribe({
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timeout: 30_000,
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relays: ["wss://relay.wavlake.com"],
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filters: [{
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kinds: [31337],
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'#p': ['8806372af51515bf4aef807291b96487ea1826c966a5596bca86697b5d8b23bc'],
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}],
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})
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// Push event ids to our suggestions
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sub.on('event', (url, e) => tags.push(["e", e.id, url]))
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const dvm = new DVM({
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// The private key used to sign events
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sk: hexPrivateKey,
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// Relays that the DVM will listen on
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relays: ['wss://relay.damus.io', 'wss://dvms.f7z.io'],
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// Only listen to requests tagging our dvm
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requireMention: true,
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// Expire results after 1 hour (the default)
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expireAfter: 60 * 60,
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// Handlers for various kinds
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handlers: {
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5300: dvm => ({
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handleEvent: async function* (event) {
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// DVM responses are stringified into the content
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const content = JSON.stringify(tags)
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// Yield our response. Kind 7000 can be used for partial results too
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yield createEvent(event.kind + 1000, {content})
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},
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}),
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}
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})
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// Enable logging
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dvm.logEvents = true
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// When you're ready
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dvm.start()
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// When you're done
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dvm.stop()
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```
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## Installation
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