Service booting and feeding :happy:

backend/IPriceFetcher.ts

@@ -7,19 +7,21 @@
  */
 
 import { PriceTicker } from './PriceTicker'
+import { IStrategy } from './strategy/strategy'
 
 export interface IPriceFetcher {
     start(): void
     stop(): void
+    hasData(): boolean
 
     /**
      * Set price aggregation strategy for this fetcher.
      * @param IStrategy The local price aggregation strategy
      */
-    setStrategy(IStrategy)
+    setStrategy(s: IStrategy)
 
     /**
      * Get the current price, according to running strategy.
      */
-    queryTicker(): PriceTicker
+    queryTicker(): PriceTicker | undefined
 }

backend/IPublisher.ts

@@ -1,3 +1,4 @@
+/* eslint-disable no-unused-vars */
 /**
  * Pricecaster Service.
  *
@@ -7,12 +8,18 @@
  */
 
 import { PriceTicker } from './PriceTicker'
+import { StatusCode } from './statusCodes'
 
-export class PublishInfo {
+export type PublishInfo = {
-    block: BigInt = BigInt(0)
+    status: StatusCode,
-    txid: string = ''
+    reason?: '',
+    msgb64?: '',
+    block?: BigInt
+    txid?: string
 }
 
 export interface IPublisher {
+    start(): void
+    stop(): void
     publish(tick: PriceTicker): Promise<PublishInfo>
 }

backend/PythPriceFetcher.ts

@@ -27,8 +27,8 @@ export class PythPriceFetcher implements IPriceFetcher {
     this.symbol = symbol
   }
 
-  start (): void {
+  async start () {
-    this.pythConnection.start()
+    await this.pythConnection.start()
     this.pythConnection.onPriceChange((product: Product, price: PriceData) => {
       if (product.symbol === this.symbol) {
         this.onPriceChange(price)
@@ -37,14 +37,18 @@ export class PythPriceFetcher implements IPriceFetcher {
   }
 
   stop (): void {
-    throw new Error('Method not implemented.')
+    this.pythConnection.stop()
   }
 
   setStrategy (s: IStrategy) {
     this.strategy = s
   }
 
-  queryTicker (): PriceTicker {
+  hasData (): boolean {
+    return this.strategy.bufferCount() > 0
+  }
+
+  queryTicker (): PriceTicker | undefined {
     return this.strategy.getPrice()
   }
 

backend/main.ts

@@ -1,7 +1,8 @@
+/* eslint-disable no-unused-vars */
 /**
  * Pricecaster Service.
  *
- * Fetcher backend component.
+ * Main program file.
  *
  * (c) 2021 Randlabs, Inc.
  */
@@ -9,29 +10,79 @@
 import { PythPriceFetcher } from './PythPriceFetcher'
 import { StdAlgoPublisher } from './publisher/StdAlgoPublisher'
 import { StrategyLastPrice } from './strategy/strategyLastPrice'
+import { IPriceFetcher } from './IPriceFetcher'
+import { IPublisher, PublishInfo } from './IPublisher'
+import { PriceTicker } from './PriceTicker'
+import { StatusCode } from './statusCodes'
+import Status from 'algosdk/dist/types/src/client/v2/algod/status'
 const settings = require('../settings')
 const algosdk = require('algosdk')
+const charm = require('charm')()
 
-console.log('Pricecaster Service Fetcher  -- (c) 2021 Randlabs.io\n')
+export function sleep (ms: number) {
-
+  return new Promise((resolve) => {
-const fetchers: { [key: string]: PythPriceFetcher } = {}
+    setTimeout(resolve, ms)
-const publishers: { [key: string]: StdAlgoPublisher } = {}
+  })
-
-for (const sym in settings.symbols) {
-  console.log(`Setting up fetcher/publisher for ${sym}`)
-  publishers[sym] = new StdAlgoPublisher(sym,
-    settings.symbols[sym].priceKeeperAppId,
-    settings.symbols[sym].validator,
-    algosdk.mnemonicToSecretKey(settings.symbols[sym].mnemo)
-  )
-  fetchers[sym] = new PythPriceFetcher(sym, new StrategyLastPrice())
 }
 
-// const pricefetcher = new PythPriceFetcher('BTC/USD', new StrategyLastPrice(10))
+type WorkerRoutineStatus = {
-// const publisher = new StdAlgoPublisher('BTC/USD', 38888888, )
+  status: StatusCode,
+  reason?: string,
+  tick?: PriceTicker,
+  pub?: PublishInfo
+}
 
-// async function processTick() {
+async function workerRoutine (fetcher: IPriceFetcher, publisher: IPublisher): Promise<WorkerRoutineStatus> {
-//   const tick = pricefetcher.queryTicker()
+  const tick = fetcher.queryTicker()
-//   const publishInfo = await publisher.publish(tick)
+  if (tick === undefined) {
-//   setTimeout(processTick, 1000)
+    return { status: StatusCode.NO_TICKER }
-// })
+  }
+  const pub = await publisher.publish(tick)
+  return { status: pub.status, reason: pub.reason, tick, pub }
+}
+
+(async () => {
+  charm.pipe(process.stdout)
+  charm.reset()
+  console.log('Pricecaster Service Fetcher  -- (c) 2021 Randlabs.io\n')
+  const params = settings.params
+  console.log(`Setting up fetcher/publisher for ${params.symbol} for PriceKeeper App ${params.priceKeeperAppId}, interval ${params.publishIntervalSecs} secs`)
+
+  const publisher = new StdAlgoPublisher(params.symbol,
+    params.priceKeeperAppId,
+    params.validator,
+    (algosdk.mnemonicToSecretKey(params.mnemo)).sk
+  )
+  const fetcher = new PythPriceFetcher(params.symbol, new StrategyLastPrice(params.bufferSize))
+  await fetcher.start()
+
+  console.log('Waiting for fetcher to boot...')
+  while (!fetcher.hasData()) {
+    await sleep(250)
+  }
+  console.log('Waiting for publisher to boot...')
+  await publisher.start()
+  console.log('Starting worker.')
+
+  let active = true
+  charm.on('^C', () => {
+    console.log('CTRL+C: Aborted by user.')
+    active = false
+  })
+  // eslint-disable-next-line no-unmodified-loop-condition
+  let pubCount = 0
+  while (active) {
+    const wrs = await workerRoutine(fetcher, publisher)
+    switch (wrs.status) {
+      case StatusCode.OK:
+        console.log(`[PUB ${pubCount++}] ${wrs.tick!.price}±${wrs.tick!.confidence} t:${wrs.tick!.networkTime} TXID:${wrs.pub!.txid})`)
+        break
+      case StatusCode.NO_TICKER:
+        console.log('No ticker available from fetcher data source')
+        break
+      default:
+        console.log('Error. Reason: ' + wrs.reason)
+    }
+    await sleep(params.publishIntervalSecs * 1000)
+  }
+})()

backend/publisher/StdAlgoPublisher.ts

@@ -1,6 +1,7 @@
 import algosdk from 'algosdk'
 import { IPublisher, PublishInfo } from '../IPublisher'
 import { PriceTicker } from '../PriceTicker'
+import { StatusCode } from '../statusCodes'
 const PricecasterLib = require('../../lib/pricecaster')
 const settings = require('../../settings')
 
@@ -18,28 +19,50 @@ export class StdAlgoPublisher implements IPublisher {
     this.pclib.setAppId(appId)
   }
 
+  async start () {
+    await this.pclib.compileApprovalProgram()
+  }
+
+  stop () {
+
+  }
+
   signCallback (sender: string, tx: algosdk.Transaction) {
     const txSigned = tx.signTxn(this.signKey)
     return txSigned
   }
 
   async publish (tick: PriceTicker): Promise<PublishInfo> {
-    const publishInfo = new PublishInfo()
+    const publishInfo: PublishInfo = { status: StatusCode.OK }
-    const msg = this.pclib.createMessage(
+    let msg, txId
+    try {
+      msg = this.pclib.createMessage(
         this.symbol,
         tick.price,
-      tick.exponent,
+        BigInt(tick.exponent),
         tick.confidence,
         tick.networkTime,
         this.signKey)
+      publishInfo.msgb64 = msg.toString('base64')
+    } catch (e: any) {
+      publishInfo.status = StatusCode.ERROR_CREATE_MESSAGE
+      publishInfo.reason = e.toString()
+      return publishInfo
+    }
 
-    const txId = await this.pclib.submitMessage(
+    try {
+      txId = await this.pclib.submitMessage(
         this.validator,
         msg,
-      this.signCallback
+        this.signCallback.bind(this)
       )
-
       publishInfo.txid = txId
+    } catch (e: any) {
+      publishInfo.status = StatusCode.ERROR_SUBMIT_MESSAGE
+      publishInfo.reason = e.response.text ? e.response.text : e.toString()
+      return publishInfo
+    }
+
     return publishInfo
   }
 }

backend/sleep.ts

@@ -0,0 +1,5 @@
+export function sleep(ms: number) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms);
+  });
+}

backend/statusCodes.ts

@@ -0,0 +1,13 @@
+/* eslint-disable no-unused-vars */
+export enum StatusCode {
+  OK,
+  NO_TICKER,
+  ERROR_CREATE_MESSAGE,
+  ERROR_SUBMIT_MESSAGE,
+  GENERAL_ERROR
+}
+
+// export const StatusToString = {
+//   StatusCode.OK: 'Operation successful'
+
+// }

backend/strategy/strategy.ts

@@ -24,6 +24,11 @@ export interface IStrategy {
      */
     clearBuffer(): void
 
+    /**
+     * Returns the current number of items in buffer
+     */
+    bufferCount(): number
+
     /**
      * Put a new price in buffer.
      * @param priceData  The price data to put
@@ -34,5 +39,5 @@ export interface IStrategy {
     /**
      * Get the calculated price according to selected strategy.
      */
-    getPrice(): PriceTicker
+    getPrice(): PriceTicker | undefined
 }

backend/strategy/strategyBase.ts

@@ -9,13 +9,37 @@
 import { PriceTicker } from '../PriceTicker'
 import { IStrategy } from './strategy'
 
+/**
+ * A base class for queue-based buffer strategies
+ */
 export abstract class StrategyBase implements IStrategy {
+  protected buffer!: PriceTicker[]
+  protected bufSize!: number
+
   constructor (bufSize: number = 10) {
     this.createBuffer(bufSize)
   }
 
-  abstract put(priceData: PriceTicker): boolean
+  createBuffer (maxSize: number): void {
-  abstract createBuffer(size: number): void
+    this.buffer = []
-  abstract clearBuffer(): void
+    this.bufSize = maxSize
-  abstract getPrice(): PriceTicker
+  }
+
+  clearBuffer (): void {
+    this.buffer.length = 0
+  }
+
+  bufferCount (): number {
+    return this.buffer.length
+  }
+
+  put (ticker: PriceTicker): boolean {
+    if (this.buffer.length === this.bufSize) {
+      this.buffer.shift()
+    }
+    this.buffer.push(ticker)
+    return true
+  }
+
+  abstract getPrice(): PriceTicker | undefined
 }

backend/strategy/strategyBaseQueue.ts

@@ -1,36 +0,0 @@
-/**
- * Pricecaster Service.
- *
- * Fetcher backend component.
- *
- * (c) 2021 Randlabs, Inc.
- */
-
-import { PriceTicker } from '../PriceTicker'
-import { StrategyBase } from './strategyBase'
-
-/**
- * A base class for queue-based buffer strategies
- */
-export abstract class StrategyBaseQueue extends StrategyBase {
-  protected buffer: PriceTicker[] = []
-  private bufSize: number = 0
-
-  createBuffer (maxSize: number): void {
-    this.bufSize = maxSize
-  }
-
-  clearBuffer (): void {
-    this.buffer.length = 0
-  }
-
-  put (ticker: PriceTicker): boolean {
-    if (this.buffer.length === this.bufSize) {
-      this.buffer.shift()
-    }
-    this.buffer.push(ticker)
-    return true
-  }
-
-  abstract getPrice(): PriceTicker
-}

backend/strategy/strategyLastPrice.ts

@@ -1,5 +1,5 @@
 import { PriceTicker } from '../PriceTicker'
-import { StrategyBaseQueue } from './strategyBaseQueue'
+import { StrategyBase } from './strategyBase'
 /**
  * Pricecaster Service.
  *
@@ -12,12 +12,10 @@ import { StrategyBaseQueue } from './strategyBaseQueue'
  * This strategy just caches the last provided price,
  * acting as a single-item buffer.
  */
-export class StrategyLastPrice extends StrategyBaseQueue {
+export class StrategyLastPrice extends StrategyBase {
-  constructor () {
+  getPrice (): PriceTicker | undefined {
-    super(1)
+    const ret = this.buffer[this.buffer.length - 1]
-  }
+    this.clearBuffer()
-
+    return ret
-  getPrice (): PriceTicker {
-    return this.buffer[0]
   }
 }

package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "@pythnetwork/client": "^2.3.1",
         "algosdk": "^1.11.1",
+        "charm": "^1.0.2",
         "fastpriorityqueue": "^0.7.1",
         "js-sha512": "^0.8.0"
       },
@@ -999,6 +1000,14 @@
         "node": ">=8"
       }
     },
+    "node_modules/charm": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/charm/-/charm-1.0.2.tgz",
+      "integrity": "sha1-it02cVOm2aWBMxBSxAkJkdqZXjU=",
+      "dependencies": {
+        "inherits": "^2.0.1"
+      }
+    },
     "node_modules/check-error": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
@@ -5171,6 +5180,14 @@
         }
       }
     },
+    "charm": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/charm/-/charm-1.0.2.tgz",
+      "integrity": "sha1-it02cVOm2aWBMxBSxAkJkdqZXjU=",
+      "requires": {
+        "inherits": "^2.0.1"
+      }
+    },
     "check-error": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",

package.json

@@ -12,6 +12,7 @@
   "dependencies": {
     "@pythnetwork/client": "^2.3.1",
     "algosdk": "^1.11.1",
+    "charm": "^1.0.2",
     "fastpriorityqueue": "^0.7.1",
     "js-sha512": "^0.8.0"
   },

settings.js

@@ -1,22 +1,19 @@
 module.exports = {
   algo: {
     token: '',
-    api: 'https://api.betanet.algoexplorer.io',
+    api: 'https://api.testnet.algoexplorer.io',
     port: ''
   },
   pyth: {
     solanaClusterName: 'devnet'
   },
-  symbols: {
+  params: {
-    'BTC/USD': {
+    verbose: true,
-      priceKeeperAppId: 3020301,
+    symbol: 'BTC/USD',
-      validator: 'OPDM7ACAW64Q4VBWAL77Z5SHSJVZZ44V3BAN7W44U43SUXEOUENZMZYOQU',
+    bufferSize: 100,
-      mnemo: 'assault approve result rare float sugar power float soul kind galaxy edit unusual pretty tone tilt net range pelican avoid unhappy amused recycle abstract master'
+    publishIntervalSecs: 30,
-    },
+    priceKeeperAppId: 32968790,
-    'ETH/USD': {
-      priceKeeperAppId: 3020301,
     validator: 'OPDM7ACAW64Q4VBWAL77Z5SHSJVZZ44V3BAN7W44U43SUXEOUENZMZYOQU',
     mnemo: 'assault approve result rare float sugar power float soul kind galaxy edit unusual pretty tone tilt net range pelican avoid unhappy amused recycle abstract master'
   }
 }
-}