classic-ui/services/bloom.js
Danil Kovtonyuk 44f31f8b9f
init
2022-04-22 13:14:19 +10:00

84 lines
1.9 KiB
JavaScript

import BloomFilter from 'bloomfilter.js'
import { download } from '@/store/snark'
class BloomService {
constructor({ amount, commitment, instanceName, fileName, fileFolder }) {
this.amount = amount
this.fileFolder = fileFolder
this.commitment = commitment
this.instanceName = instanceName
this.fileName = `${fileFolder}/${fileName}`
this.idb = window.$nuxt.$indexedDB
}
async downloadBloom() {
const cachedBloom = await download({
name: this.fileName,
contentType: 'string',
eventName: this.fileFolder
})
if (!cachedBloom) {
throw new Error('Cant download file')
}
return BloomFilter.deserialize(cachedBloom)
}
async getBloomFromDB() {
try {
const stringifyCachedBloom = await this.idb.getAll({
storeName: `stringify_bloom_${this.instanceName}`
})
if (!stringifyCachedBloom || !stringifyCachedBloom.length) {
return undefined
}
const [{ tree }] = stringifyCachedBloom
return BloomFilter.deserialize(tree)
} catch (err) {
return undefined
}
}
async getBloomFromCache() {
try {
const bloom = await this.downloadBloom()
await this.saveBloom({ bloom })
return bloom
} catch (err) {
return false
}
}
async checkBloom() {
let cachedBloom = await this.getBloomFromDB()
if (!cachedBloom) {
cachedBloom = await this.getBloomFromCache()
}
return cachedBloom.test(this.commitment)
}
async saveBloom({ bloom }) {
try {
await this.idb.putItem({
storeName: `stringify_bloom_${this.instanceName}`,
data: {
hashBloom: '1', // need for replace bloom
tree: bloom.serialize()
},
key: 'hashBloom'
})
} catch (err) {
console.error('saveBloom has error:', err.message)
}
}
}
export const bloomService = (payload) => new BloomService(payload)