Fix/pipeline/ohlcv ratelimit (#1403)

Use time-based throttling and increase batch size of CC query

4 files changed, 21 insertions, 23 deletions

diff --git a/packages/pipeline/package.json b/packages/pipeline/package.json
index 0539618d4..4fde906b8 100644
--- a/packages/pipeline/package.json
+++ b/packages/pipeline/package.json
@@ -52,9 +52,9 @@
         "@types/p-limit": "^2.0.0",
         "async-parallel": "^1.2.3",
         "axios": "^0.18.0",
+        "bottleneck": "^2.13.2",
         "dockerode": "^2.5.7",
         "ethereum-types": "^1.0.6",
-        "p-limit": "^2.0.0",
         "pg": "^7.5.0",
         "prettier": "^1.15.3",
         "ramda": "^0.25.0",
diff --git a/packages/pipeline/src/data_sources/ohlcv_external/crypto_compare.ts b/packages/pipeline/src/data_sources/ohlcv_external/crypto_compare.ts
index 8804c34d0..85042501b 100644
--- a/packages/pipeline/src/data_sources/ohlcv_external/crypto_compare.ts
+++ b/packages/pipeline/src/data_sources/ohlcv_external/crypto_compare.ts
@@ -1,6 +1,6 @@
 // tslint:disable:no-duplicate-imports
 import { fetchAsync } from '@0x/utils';
-import promiseLimit = require('p-limit');
+import Bottleneck from 'bottleneck';
 import { stringify } from 'querystring';
 import * as R from 'ramda';
 
@@ -33,43 +33,41 @@ export interface CryptoCompareOHLCVParams {
     toTs?: number;
 }
 
-const ONE_WEEK = 7 * 24 * 60 * 60 * 1000; // tslint:disable-line:custom-no-magic-numbers
 const ONE_HOUR = 60 * 60 * 1000; // tslint:disable-line:custom-no-magic-numbers
 const ONE_SECOND = 1000;
 const ONE_HOUR_AGO = new Date().getTime() - ONE_HOUR;
 const HTTP_OK_STATUS = 200;
 const CRYPTO_COMPARE_VALID_EMPTY_RESPONSE_TYPE = 96;
+const MAX_PAGE_SIZE = 2000;
 
 export class CryptoCompareOHLCVSource {
-    public readonly interval = ONE_WEEK; // the hourly API returns data for one week at a time
-    public readonly default_exchange = 'CCCAGG';
     public readonly intervalBetweenRecords = ONE_HOUR;
+    public readonly defaultExchange = 'CCCAGG';
+    public readonly interval = this.intervalBetweenRecords * MAX_PAGE_SIZE; // the hourly API returns data for one interval at a time
     private readonly _url: string = 'https://min-api.cryptocompare.com/data/histohour?';
 
     // rate-limit for all API calls through this class instance
-    private readonly _promiseLimit: (fetchFn: () => Promise<Response>) => Promise<Response>;
-    constructor(maxConcurrentRequests: number = 50) {
-        this._promiseLimit = promiseLimit(maxConcurrentRequests);
+    private readonly _limiter: Bottleneck;
+    constructor(maxReqsPerSecond: number) {
+        this._limiter = new Bottleneck({
+            minTime: ONE_SECOND / maxReqsPerSecond,
+            reservoir: 30,
+            reservoirRefreshAmount: 30,
+            reservoirRefreshInterval: ONE_SECOND,
+        });
     }
 
     // gets OHLCV records starting from pair.latest
     public async getHourlyOHLCVAsync(pair: TradingPair): Promise<CryptoCompareOHLCVRecord[]> {
         const params = {
-            e: this.default_exchange,
+            e: this.defaultExchange,
             fsym: pair.fromSymbol,
             tsym: pair.toSymbol,
+            limit: MAX_PAGE_SIZE,
             toTs: Math.floor((pair.latestSavedTime + this.interval) / ONE_SECOND), // CryptoCompare uses timestamp in seconds. not ms
         };
         const url = this._url + stringify(params);
-
-        // go through the instance-wide rate-limit
-        const fetchPromise: Promise<Response> = this._promiseLimit(() => {
-            // tslint:disable-next-line:no-console
-            console.log(`Scraping Crypto Compare at ${url}`);
-            return fetchAsync(url);
-        });
-
-        const response = await Promise.resolve(fetchPromise);
+        const response = await this._limiter.schedule(() => fetchAsync(url));
         if (response.status !== HTTP_OK_STATUS) {
             throw new Error(`HTTP error while scraping Crypto Compare: [${response}]`);
         }
diff --git a/packages/pipeline/src/scripts/pull_ohlcv_cryptocompare.ts b/packages/pipeline/src/scripts/pull_ohlcv_cryptocompare.ts
index 7377a64d8..d44eb5cc6 100644
--- a/packages/pipeline/src/scripts/pull_ohlcv_cryptocompare.ts
+++ b/packages/pipeline/src/scripts/pull_ohlcv_cryptocompare.ts
@@ -11,7 +11,7 @@ import { fetchOHLCVTradingPairsAsync, TradingPair } from '../utils/get_ohlcv_tra
 const SOURCE_NAME = 'CryptoCompare';
 const TWO_HOURS_AGO = new Date().getTime() - 2 * 60 * 60 * 1000; // tslint:disable-line:custom-no-magic-numbers
 
-const MAX_CONCURRENT_REQUESTS = parseInt(process.env.CRYPTOCOMPARE_MAX_CONCURRENT_REQUESTS || '14', 10); // tslint:disable-line:custom-no-magic-numbers
+const MAX_REQS_PER_SECOND = parseInt(process.env.CRYPTOCOMPARE_MAX_REQS_PER_SECOND || '15', 10); // tslint:disable-line:custom-no-magic-numbers
 const EARLIEST_BACKFILL_DATE = process.env.OHLCV_EARLIEST_BACKFILL_DATE || '2014-06-01';
 const EARLIEST_BACKFILL_TIME = new Date(EARLIEST_BACKFILL_DATE).getTime();
 
@@ -20,7 +20,7 @@ let connection: Connection;
 (async () => {
     connection = await createConnection(ormConfig as ConnectionOptions);
     const repository = connection.getRepository(OHLCVExternal);
-    const source = new CryptoCompareOHLCVSource(MAX_CONCURRENT_REQUESTS);
+    const source = new CryptoCompareOHLCVSource(MAX_REQS_PER_SECOND);
 
     const jobTime = new Date().getTime();
     const tradingPairs = await fetchOHLCVTradingPairsAsync(connection, SOURCE_NAME, EARLIEST_BACKFILL_TIME);
@@ -63,7 +63,7 @@ async function fetchAndSaveAsync(
             console.log(`Retrieved ${records.length} records for ${JSON.stringify(pair)}`);
             if (records.length > 0) {
                 const metadata: OHLCVMetadata = {
-                    exchange: source.default_exchange,
+                    exchange: source.defaultExchange,
                     fromSymbol: pair.fromSymbol,
                     toSymbol: pair.toSymbol,
                     source: SOURCE_NAME,
diff --git a/packages/pipeline/test/data_sources/ohlcv_external/crypto_compare_test.ts b/packages/pipeline/test/data_sources/ohlcv_external/crypto_compare_test.ts
index cb374bbb1..2efe3f5ec 100644
--- a/packages/pipeline/test/data_sources/ohlcv_external/crypto_compare_test.ts
+++ b/packages/pipeline/test/data_sources/ohlcv_external/crypto_compare_test.ts
@@ -13,7 +13,7 @@ const expect = chai.expect;
 describe('ohlcv_external data source (Crypto Compare)', () => {
     describe('generateBackfillIntervals', () => {
         it('generates pairs with intervals to query', () => {
-            const source = new CryptoCompareOHLCVSource();
+            const source = new CryptoCompareOHLCVSource(20);
             const pair: TradingPair = {
                 fromSymbol: 'ETH',
                 toSymbol: 'ZRX',
@@ -31,7 +31,7 @@ describe('ohlcv_external data source (Crypto Compare)', () => {
         });
 
         it('returns single pair if no backfill is needed', () => {
-            const source = new CryptoCompareOHLCVSource();
+            const source = new CryptoCompareOHLCVSource(20);
             const pair: TradingPair = {
                 fromSymbol: 'ETH',
                 toSymbol: 'ZRX',