fix(environment): pick best node (#5752)

libs/environment/src/components/node-switcher/row-data.spec.tsx

@@ -23,7 +23,6 @@ import {
   SUBSCRIPTION_TIMEOUT,
   useNodeBasicStatus,
   useNodeSubscriptionStatus,
-  useResponseTime,
 } from './row-data';
 import { BLOCK_THRESHOLD, RowData } from './row-data';
 import { CUSTOM_NODE_KEY } from '../../types';
@@ -162,19 +161,6 @@ describe('useNodeBasicStatus', () => {
   });
 });
 
-describe('useResponseTime', () => {
-  it('returns response time when url is valid', () => {
-    const { result } = renderHook(() =>
-      useResponseTime('https://localhost:1234')
-    );
-    expect(result.current.responseTime).toBe(50);
-  });
-  it('does not return response time when url is invalid', () => {
-    const { result } = renderHook(() => useResponseTime('nope'));
-    expect(result.current.responseTime).toBeUndefined();
-  });
-});
-
 describe('RowData', () => {
   const props = {
     id: '0',

libs/environment/src/components/node-switcher/row-data.tsx

@@ -1,4 +1,3 @@
-import { isValidUrl } from '@vegaprotocol/utils';
 import { TradingRadio } from '@vegaprotocol/ui-toolkit';
 import { useEffect, useState } from 'react';
 import { CUSTOM_NODE_KEY } from '../../types';
@@ -8,6 +7,7 @@ import {
 } from '../../utils/__generated__/NodeCheck';
 import { LayoutCell } from './layout-cell';
 import { useT } from '../../use-t';
+import { useResponseTime } from '../../utils/time';
 
 export const POLL_INTERVAL = 1000;
 export const SUBSCRIPTION_TIMEOUT = 3000;
@@ -108,20 +108,6 @@ export const useNodeBasicStatus = () => {
   };
 };
 
-export const useResponseTime = (url: string, trigger?: unknown) => {
-  const [responseTime, setResponseTime] = useState<number>();
-  useEffect(() => {
-    if (!isValidUrl(url)) return;
-    if (typeof window.performance.getEntriesByName !== 'function') return; // protection for test environment
-    const requestUrl = new URL(url);
-    const requests = window.performance.getEntriesByName(requestUrl.href);
-    const { duration } =
-      (requests.length && requests[requests.length - 1]) || {};
-    setResponseTime(duration);
-  }, [url, trigger]);
-  return { responseTime };
-};
-
 export const RowData = ({
   id,
   url,

libs/environment/src/hooks/use-environment.spec.ts

@@ -10,6 +10,7 @@ import {
   getUserEnabledFeatureFlags,
   setUserEnabledFeatureFlag,
 } from './use-environment';
+import { canMeasureResponseTime, measureResponseTime } from '../utils/time';
 
 const noop = () => {
   /* no op*/
@@ -17,6 +18,10 @@ const noop = () => {
 
 jest.mock('@vegaprotocol/apollo-client');
 jest.mock('zustand');
+jest.mock('../utils/time');
+
+const mockCanMeasureResponseTime = canMeasureResponseTime as jest.Mock;
+const mockMeasureResponseTime = measureResponseTime as jest.Mock;
 
 const mockCreateClient = createClient as jest.Mock;
 const createDefaultMockClient = () => {
@@ -155,6 +160,14 @@ describe('useEnvironment', () => {
     const fastNode = 'https://api.n01.foo.vega.xyz';
     const fastWait = 1000;
     const nodes = [slowNode, fastNode];
+
+    mockCanMeasureResponseTime.mockImplementation(() => true);
+    mockMeasureResponseTime.mockImplementation((url: string) => {
+      if (url === slowNode) return slowWait;
+      if (url === fastNode) return fastWait;
+      return Infinity;
+    });
+
     // @ts-ignore: typscript doesn't recognise the mock implementation
     global.fetch.mockImplementation(setupFetch({ hosts: nodes }));
 
@@ -168,7 +181,7 @@ describe('useEnvironment', () => {
                 statistics: {
                   chainId: 'chain-id',
                   blockHeight: '100',
-                  vegaTime: new Date().toISOString(),
+                  vegaTime: new Date(1).toISOString(),
                 },
               },
             });
@@ -196,7 +209,8 @@ describe('useEnvironment', () => {
       expect(result.current.nodes).toEqual(nodes);
     });
 
-    jest.runAllTimers();
+    jest.advanceTimersByTime(2000);
+    // jest.runAllTimers();
 
     await waitFor(() => {
       expect(result.current.status).toEqual('success');

libs/environment/src/hooks/use-environment.ts

@@ -19,6 +19,9 @@ import { compileErrors } from '../utils/compile-errors';
 import { envSchema } from '../utils/validate-environment';
 import { tomlConfigSchema } from '../utils/validate-configuration';
 import uniq from 'lodash/uniq';
+import orderBy from 'lodash/orderBy';
+import first from 'lodash/first';
+import { canMeasureResponseTime, measureResponseTime } from '../utils/time';
 
 type Client = ReturnType<typeof createClient>;
 type ClientCollection = {
@@ -38,8 +41,17 @@ export type EnvStore = Env & Actions;
 
 const VERSION = 1;
 export const STORAGE_KEY = `vega_url_${VERSION}`;
+
+const QUERY_TIMEOUT = 3000;
 const SUBSCRIPTION_TIMEOUT = 3000;
 
+const raceAgainst = (timeout: number): Promise<false> =>
+  new Promise((resolve) => {
+    setTimeout(() => {
+      resolve(false);
+    }, timeout);
+  });
+
 /**
  * Fetch and validate a vega node configuration
  */
@@ -64,53 +76,88 @@ const fetchConfig = async (url?: string) => {
 const findNode = async (clients: ClientCollection): Promise<string | null> => {
   const tests = Object.entries(clients).map((args) => testNode(...args));
   try {
-    const url = await Promise.any(tests);
+    const nodes = await Promise.all(tests);
-    return url;
+    const responsiveNodes = nodes
-  } catch {
+      .filter(([, q, s]) => q && s)
+      .map(([url, q]) => {
+        return {
+          url,
+          ...q,
+        };
+      });
+
+    // more recent and faster at the top
+    const ordered = orderBy(
+      responsiveNodes,
+      [(n) => n.blockHeight, (n) => n.vegaTime, (n) => n.responseTime],
+      ['desc', 'desc', 'asc']
+    );
+
+    const best = first(ordered);
+    return best ? best.url : null;
+  } catch (err) {
     // All tests rejected, no suitable node found
     return null;
   }
 };
 
+type Maybe<T> = T | false;
+type QueryTestResult = {
+  blockHeight: number;
+  vegaTime: Date;
+  responseTime: number;
+};
+type SubscriptionTestResult = true;
+type NodeTestResult = [
+  /** url */
+  string,
+  Maybe<QueryTestResult>,
+  Maybe<SubscriptionTestResult>
+];
 /**
  * Test a node for suitability for connection
  */
 const testNode = async (
   url: string,
   client: Client
-): Promise<string | null> => {
+): Promise<NodeTestResult> => {
   const results = await Promise.all([
-    // these promises will only resolve with true/false
+    testQuery(client, url),
-    testQuery(client),
     testSubscription(client),
   ]);
-  if (results[0] && results[1]) {
+  return [url, ...results];
-    return url;
-  }
-
-  const message = `Tests failed for node: ${url}`;
-  console.warn(message);
-
-  // throwing here will mean this tests is ignored and a different
-  // node that hopefully does resolve will fulfill the Promise.any
-  throw new Error(message);
 };
 
 /**
  * Run a test query on a client
  */
-const testQuery = async (client: Client) => {
+const testQuery = (
-  try {
+  client: Client,
-    const result = await client.query<NodeCheckQuery>({
+  url: string
-      query: NodeCheckDocument,
+): Promise<Maybe<QueryTestResult>> => {
-    });
+  const test: Promise<Maybe<QueryTestResult>> = new Promise((resolve) =>
-    if (!result || result.error) {
+    client
-      return false;
+      .query<NodeCheckQuery>({
-    }
+        query: NodeCheckDocument,
-    return true;
+      })
-  } catch (err) {
+      .then((result) => {
-    return false;
+        if (result && !result.error) {
-  }
+          const res = {
+            blockHeight: Number(result.data.statistics.blockHeight),
+            vegaTime: new Date(result.data.statistics.vegaTime),
+            // only after a request has been sent we can retrieve the response time
+            responseTime: canMeasureResponseTime(url)
+              ? measureResponseTime(url) || Infinity
+              : Infinity,
+          } as QueryTestResult;
+          resolve(res);
+        } else {
+          resolve(false);
+        }
+      })
+      .catch(() => resolve(false))
+  );
+  return Promise.race([test, raceAgainst(QUERY_TIMEOUT)]);
 };
 
 /**
@@ -118,7 +165,9 @@ const testQuery = async (client: Client) => {
  * that takes longer than SUBSCRIPTION_TIMEOUT ms to respond
  * is deemed a failure
  */
-const testSubscription = (client: Client) => {
+const testSubscription = (
+  client: Client
+): Promise<Maybe<SubscriptionTestResult>> => {
   return new Promise((resolve) => {
     const sub = client
       .subscribe<NodeCheckTimeUpdateSubscription>({

libs/environment/src/utils/time.spec.ts

@@ -0,0 +1,22 @@
+import { renderHook } from '@testing-library/react';
+import { useResponseTime } from './time';
+
+const mockResponseTime = 50;
+global.performance.getEntriesByName = jest.fn().mockReturnValue([
+  {
+    duration: mockResponseTime,
+  },
+]);
+
+describe('useResponseTime', () => {
+  it('returns response time when url is valid', () => {
+    const { result } = renderHook(() =>
+      useResponseTime('https://localhost:1234')
+    );
+    expect(result.current.responseTime).toBe(50);
+  });
+  it('does not return response time when url is invalid', () => {
+    const { result } = renderHook(() => useResponseTime('nope'));
+    expect(result.current.responseTime).toBeUndefined();
+  });
+});

libs/environment/src/utils/time.ts

@@ -0,0 +1,25 @@
+import { isValidUrl } from '@vegaprotocol/utils';
+import { useEffect, useState } from 'react';
+
+export const useResponseTime = (url: string, trigger?: unknown) => {
+  const [responseTime, setResponseTime] = useState<number>();
+  useEffect(() => {
+    if (!canMeasureResponseTime(url)) return;
+    const duration = measureResponseTime(url);
+    setResponseTime(duration);
+  }, [url, trigger]);
+  return { responseTime };
+};
+
+export const canMeasureResponseTime = (url: string) => {
+  if (!isValidUrl(url)) return false;
+  if (typeof window.performance.getEntriesByName !== 'function') return false;
+  return true;
+};
+
+export const measureResponseTime = (url: string) => {
+  const requestUrl = new URL(url);
+  const requests = window.performance.getEntriesByName(requestUrl.href);
+  const { duration } = (requests.length && requests[requests.length - 1]) || {};
+  return duration;
+};