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import { asArray, asString, doubleSha256BE, sdk, sha256Hash, wait } from '../index.client'
import { ServiceCollection } from './ServiceCollection'
import { createDefaultWalletServicesOptions } from './createDefaultWalletServicesOptions'
import { ChaintracksChainTracker } from './chaintracker'
import { getTaalArcServiceConfig, makePostBeefToTaalARC, makePostTxsToTaalARC } from './providers/arcServices'
import { getMerklePathFromWhatsOnChainTsc, getRawTxFromWhatsOnChain, getUtxoStatusFromWhatsOnChain, updateBsvExchangeRate } from './providers/whatsonchain'
import { updateChaintracksFiatExchangeRates, updateExchangeratesapi } from './providers/echangeRates'
export class Services implements sdk.WalletServices {
static createDefaultOptions(chain: sdk.Chain): sdk.WalletServicesOptions {
return createDefaultWalletServicesOptions(chain)
}
options: sdk.WalletServicesOptions
getMerklePathServices: ServiceCollection<sdk.GetMerklePathService>
getRawTxServices: ServiceCollection<sdk.GetRawTxService>
postTxsServices: ServiceCollection<sdk.PostTxsService>
postBeefServices: ServiceCollection<sdk.PostBeefService>
getUtxoStatusServices: ServiceCollection<sdk.GetUtxoStatusService>
updateFiatExchangeRateServices: ServiceCollection<sdk.UpdateFiatExchangeRateService>
chain: sdk.Chain
constructor(optionsOrChain: sdk.Chain | sdk.WalletServicesOptions) {
this.chain = (typeof optionsOrChain === 'string') ? optionsOrChain : optionsOrChain.chain
this.options = (typeof optionsOrChain === 'string') ? Services.createDefaultOptions(this.chain) : optionsOrChain
this.getMerklePathServices = new ServiceCollection<sdk.GetMerklePathService>()
.add({ name: 'WhatsOnChainTsc', service: getMerklePathFromWhatsOnChainTsc })
//.add({ name: 'Taal', service: makeGetMerklePathFromTaalARC(getTaalArcServiceConfig(this.chain, this.options.taalApiKey!)) })
this.getRawTxServices = new ServiceCollection<sdk.GetRawTxService>()
.add({ name: 'WhatsOnChain', service: getRawTxFromWhatsOnChain })
this.postTxsServices = new ServiceCollection<sdk.PostTxsService>()
.add({ name: 'TaalArcTxs', service: makePostTxsToTaalARC(getTaalArcServiceConfig(this.chain, this.options.taalApiKey!)) })
this.postBeefServices = new ServiceCollection<sdk.PostBeefService>()
.add({ name: 'TaalArcBeef', service: makePostBeefToTaalARC(getTaalArcServiceConfig(this.chain, this.options.taalApiKey!)) })
this.getUtxoStatusServices = new ServiceCollection<sdk.GetUtxoStatusService>()
.add({ name: 'WhatsOnChain', service: getUtxoStatusFromWhatsOnChain })
this.updateFiatExchangeRateServices = new ServiceCollection<sdk.UpdateFiatExchangeRateService>()
.add({ name: 'ChaintracksService', service: updateChaintracksFiatExchangeRates })
.add({ name: 'exchangeratesapi', service: updateExchangeratesapi })
}
async getChainTracker(): Promise<ChainTracker> {
Iif (!this.options.chaintracks)
throw new sdk.WERR_INVALID_PARAMETER('options.chaintracks', `valid to enable 'getChainTracker' service.`)
return new ChaintracksChainTracker(this.chain, this.options.chaintracks)
}
async getBsvExchangeRate(): Promise<number> {
this.options.bsvExchangeRate = await updateBsvExchangeRate(this.options.bsvExchangeRate, this.options.bsvUpdateMsecs)
return this.options.bsvExchangeRate.rate
}
async getFiatExchangeRate(currency: "USD" | "GBP" | "EUR", base?: "USD" | "GBP" | "EUR"): Promise<number> {
const rates = await this.updateFiatExchangeRates(this.options.fiatExchangeRates, this.options.fiatUpdateMsecs)
this.options.fiatExchangeRates = rates
base ||= 'USD'
const rate = rates.rates[currency] / rates.rates[base]
return rate
}
get getProofsCount() { return this.getMerklePathServices.count }
get getRawTxsCount() { return this.getRawTxServices.count }
get postTxsServicesCount() { return this.postTxsServices.count }
get postBeefServicesCount() { return this.postBeefServices.count }
get getUtxoStatsCount() { return this.getUtxoStatusServices.count }
async getUtxoStatus(output: string, outputFormat?: sdk.GetUtxoStatusOutputFormat, useNext?: boolean): Promise<sdk.GetUtxoStatusResult> {
const services = this.getUtxoStatusServices
Iif (useNext)
services.next()
let r0: sdk.GetUtxoStatusResult = { name: "<noservices>", status: "error", error: new sdk.WERR_INTERNAL('No services available.'), details: [] }
for (let retry = 0; retry < 2; retry++) {
for (let tries = 0; tries < services.count; tries++) {
const service = services.service
const r = await service(output, this.chain, outputFormat)
if (r.status === 'success') {
r0 = r
break
}
services.next()
}
if (r0.status === 'success')
break;
await wait(2000)
}
return r0
}
/**
* The beef must contain at least each rawTx for each txid.
* Some services may require input transactions as well.
* These will be fetched if missing, greatly extending the service response time.
* @param beef
* @param txids
* @returns
*/
async postTxs(beef: Beef, txids: string[]): Promise<sdk.PostTxsResult[]> {
const rs = await Promise.all(this.postTxsServices.allServices.map(async service => {
const r = await service(beef, txids, this)
return r
}))
return rs
}
/**
*
* @param beef
* @param chain
* @returns
*/
async postBeef(beef: Beef, txids: string[]): Promise<sdk.PostBeefResult[]> {
let rs = await Promise.all(this.postBeefServices.allServices.map(async service => {
const r = await service(beef, txids, this)
return r
}))
Iif (rs.every(r => r.status !== 'success')) {
rs = await this.postTxs(beef, txids)
}
return rs
}
async getRawTx(txid: string, useNext?: boolean): Promise<sdk.GetRawTxResult> {
Iif (useNext)
this.getRawTxServices.next()
const r0: sdk.GetRawTxResult = { txid }
for (let tries = 0; tries < this.getRawTxServices.count; tries++) {
const service = this.getRawTxServices.service
const r = await service(txid, this.chain)
if (r.rawTx) {
const hash = asString(doubleSha256BE(r.rawTx!))
// Confirm transaction hash matches txid
if (hash === asString(txid)) {
// If we have a match, call it done.
r0.rawTx = r.rawTx
r0.name = r.name
r0.error = undefined
break
}
r.error = new sdk.WERR_INTERNAL(`computed txid ${hash} doesn't match requested value ${txid}`)
r.rawTx = undefined
}
if (r.error && !r0.error && !r0.rawTx)
// If we have an error and didn't before...
r0.error = r.error
this.getRawTxServices.next()
}
return r0
}
async invokeChaintracksWithRetry<R>(method: () => Promise<R>): Promise<R> {
Iif (!this.options.chaintracks)
throw new sdk.WERR_INVALID_PARAMETER('options.chaintracks', 'valid for this service operation.');
for (let retry = 0; retry < 3; retry++) {
try {
const r: R = await method()
return r
} catch (eu: unknown) {
const e = sdk.WalletError.fromUnknown(eu)
if (e.code != 'ECONNRESET')
throw eu
}
}
throw new sdk.WERR_INVALID_OPERATION('hashToHeader service unavailable')
}
async getHeaderForHeight(height: number): Promise<number[]> {
const method = async () => {
const header = await this.options.chaintracks!.findHeaderForHeight(height)
Iif (!header)
throw new sdk.WERR_INVALID_PARAMETER('hash', `valid height '${height}' on mined chain ${this.chain}`);
return toBinaryBaseBlockHeader(header)
}
return this.invokeChaintracksWithRetry(method)
}
async getHeight(): Promise<number> {
const method = async () => {
return await this.options.chaintracks!.currentHeight()
}
return this.invokeChaintracksWithRetry(method)
}
async hashToHeader(hash: string): Promise<sdk.BlockHeader> {
const method = async () => {
const header = await this.options.chaintracks!.findHeaderForBlockHash(hash)
Iif (!header)
throw new sdk.WERR_INVALID_PARAMETER('hash', `valid blockhash '${hash}' on mined chain ${this.chain}`);
return header
}
return this.invokeChaintracksWithRetry(method)
}
async getMerklePath(txid: string, useNext?: boolean): Promise<sdk.GetMerklePathResult> {
Iif (useNext)
this.getMerklePathServices.next()
const r0: sdk.GetMerklePathResult = {}
for (let tries = 0; tries < this.getMerklePathServices.count; tries++) {
const service = this.getMerklePathServices.service
const r = await service(txid, this.chain, this)
if (r.merklePath) {
// If we have a proof, call it done.
r0.merklePath = r.merklePath
r0.header = r.header
r0.name = r.name
r0.error = undefined
break
} else if (r.error && !r0.error)
// If we have an error and didn't before...
r0.error = r.error
this.getMerklePathServices.next()
}
return r0
}
targetCurrencies = ['USD', 'GBP', 'EUR']
async updateFiatExchangeRates(rates?: sdk.FiatExchangeRates, updateMsecs?: number): Promise<sdk.FiatExchangeRates> {
updateMsecs ||= 1000 * 60 * 15
const freshnessDate = new Date(Date.now() - updateMsecs)
if (rates) {
// Check if the rate we know is stale enough to update.
updateMsecs ||= 1000 * 60 * 15
Iif (rates.timestamp > freshnessDate)
return rates
}
// Make sure we always start with the first service listed (chaintracks aggregator)
const services = this.updateFiatExchangeRateServices.clone()
let r0: sdk.FiatExchangeRates | undefined
for (let tries = 0; tries < services.count; tries++) {
const service = services.service
try {
const r = await service(this.targetCurrencies, this.options)
if (this.targetCurrencies.every(c => typeof r.rates[c] === 'number')) {
r0 = r
break
}
} catch (eu: unknown) {
const e = sdk.WalletError.fromUnknown(eu)
console.error(`updateFiatExchangeRates servcice name ${service.name} error ${e.message}`)
}
services.next()
}
Iif (!r0) {
console.error('Failed to update fiat exchange rates.')
Iif (!rates) throw new sdk.WERR_INTERNAL()
return rates
}
return r0
}
async nLockTimeIsFinal(tx: string | number[] | BsvTransaction | number): Promise<boolean> {
const MAXINT = 0xffffffff
const BLOCK_LIMIT = 500000000
let nLockTime: number
Iif (typeof tx === 'number')
nLockTime = tx
else {
Iif (typeof tx === 'string') {
tx = BsvTransaction.fromHex(tx)
} else Iif (Array.isArray(tx)) {
tx = BsvTransaction.fromBinary(tx)
}
if (tx instanceof BsvTransaction) {
if (tx.inputs.every(i => i.sequence === MAXINT)) {
return true
}
nLockTime = tx.lockTime
} else E{
throw new sdk.WERR_INTERNAL('Should be either @bsv/sdk Transaction or babbage-bsv Transaction')
}
}
Iif (nLockTime >= BLOCK_LIMIT) {
const limit = Math.floor(Date.now() / 1000)
return nLockTime < limit
}
const height = await this.getHeight()
return nLockTime < height
}
}
export function validateScriptHash(output: string, outputFormat?: sdk.GetUtxoStatusOutputFormat): string {
let b = asArray(output)
Iif (!outputFormat) {
if (b.length === 32)
outputFormat = 'hashLE'
else
outputFormat = 'script'
}
switch (outputFormat) {
case 'hashBE':
break;
case 'hashLE':
b = b.reverse()
break;
case 'script':
b = sha256Hash(b).reverse()
break;
default:
throw new sdk.WERR_INVALID_PARAMETER('outputFormat', `not be ${outputFormat}`)
}
return asString(b)
}
/**
* Serializes a block header as an 80 byte array.
* The exact serialized format is defined in the Bitcoin White Paper
* such that computing a double sha256 hash of the array computes
* the block hash for the header.
* @returns 80 byte array
* @publicbody
*/
export function toBinaryBaseBlockHeader(header: sdk.BaseBlockHeader): number[] {
const writer = new Utils.Writer()
writer.writeUInt32BE(header.version)
writer.writeReverse(asArray(header.previousHash))
writer.writeReverse(asArray(header.merkleRoot))
writer.writeUInt32BE(header.time)
writer.writeUInt32BE(header.bits)
writer.writeUInt32BE(header.nonce)
const r = writer.toArray()
return r
}
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