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