perf(reduce call volume): save a bunch of calls to infura when the tab is not focused, change infura IDs for v2

.env

@@ -1,2 +1,2 @@
 REACT_APP_CHAIN_ID="1"
-REACT_APP_NETWORK_URL="https://mainnet.infura.io/v3/b8800ce81b8c451698081d269b86692b"
+REACT_APP_NETWORK_URL="https://mainnet.infura.io/v3/acb7e55995d04c49bfb52b7141599467"

.env.production

@@ -1,5 +1,5 @@
 REACT_APP_CHAIN_ID="1"
-REACT_APP_NETWORK_URL="https://mainnet.infura.io/v3/2acb2baa4c06402792e0c701a3697d10"
+REACT_APP_NETWORK_URL="https://mainnet.infura.io/v3/febcb10ca2754433a61e0805bc6c047d"
 REACT_APP_PORTIS_ID="c0e2bf01-4b08-4fd5-ac7b-8e26b58cd236"
 REACT_APP_FORTMATIC_KEY="pk_live_F937DF033A1666BF"
 REACT_APP_GOOGLE_ANALYTICS_ID="UA-128182339-4"

cypress/support/commands.js

@@ -71,10 +71,9 @@ Cypress.Commands.overwrite('visit', (original, url, options) => {
     ...options,
     onBeforeLoad(win) {
       options && options.onBeforeLoad && options.onBeforeLoad(win)
-      const provider = new JsonRpcProvider('https://rinkeby.infura.io/v3/b8800ce81b8c451698081d269b86692b', 4)
+      const provider = new JsonRpcProvider('https://rinkeby.infura.io/v3/acb7e55995d04c49bfb52b7141599467', 4)
       const signer = new Wallet(PRIVATE_KEY_TEST_NEVER_USE, provider)
-      const bridge = new CustomizedBridge(signer, provider)
-      win.ethereum = bridge
+      win.ethereum = new CustomizedBridge(signer, provider)
     }
   })
 })

src/hooks/useIsWindowVisible.ts

@@ -0,0 +1,20 @@
+import { useCallback, useEffect, useState } from 'react'
+
+/**
+ * Returns whether the window is currently visible to the user.
+ */
+export default function useIsWindowVisible(): boolean {
+  const [focused, setFocused] = useState<boolean>(true)
+  const listener = useCallback(() => {
+    setFocused(document.visibilityState !== 'hidden')
+  }, [setFocused])
+
+  useEffect(() => {
+    document.addEventListener('visibilitychange', listener)
+    return () => {
+      document.removeEventListener('visibilitychange', listener)
+    }
+  }, [listener])
+
+  return focused
+}

src/state/application/updater.ts

@@ -1,5 +1,6 @@
 import { useEffect, useState } from 'react'
 import { useDebounce, useActiveWeb3React } from '../../hooks'
+import useIsWindowVisible from '../../hooks/useIsWindowVisible'
 import { updateBlockNumber } from './actions'
 import { useDispatch } from 'react-redux'
 
@@ -7,6 +8,7 @@ export default function Updater() {
   const { library, chainId } = useActiveWeb3React()
   const dispatch = useDispatch()
 
+  const windowVisible = useIsWindowVisible()
   const [maxBlockNumber, setMaxBlockNumber] = useState<number | null>(null)
   // because blocks arrive in bunches with longer polling periods, we just want
   // to process the latest one.
@@ -38,8 +40,10 @@ export default function Updater() {
 
   useEffect(() => {
     if (!chainId || !debouncedMaxBlockNumber) return
-    dispatch(updateBlockNumber({ chainId, blockNumber: debouncedMaxBlockNumber }))
-  }, [chainId, debouncedMaxBlockNumber, dispatch])
+    if (windowVisible) {
+      dispatch(updateBlockNumber({ chainId, blockNumber: debouncedMaxBlockNumber }))
+    }
+  }, [chainId, debouncedMaxBlockNumber, windowVisible, dispatch])
 
   return null
 }