fix: Revert "fix: remove gwei indicator", restore block number (#5891)

* Revert "fix: remove gwei indicator (#5873)"

This reverts commit 409ba72f.

* add back block number

src/components/Polling/ChainConnectivityWarning.tsx

+import { Trans } from '@lingui/macro'
+import { useWeb3React } from '@web3-react/core'
+import { getChainInfoOrDefault, L2ChainInfo } from 'constants/chainInfo'
+import { SupportedChainId } from 'constants/chains'
+import { AlertTriangle } from 'react-feather'
+import styled from 'styled-components/macro'
+import { ExternalLink, MEDIA_WIDTHS } from 'theme'
+
+const BodyRow = styled.div`
+  color: ${({ theme }) => theme.textPrimary};
+  font-size: 12px;
+  font-weight: 400;
+  font-size: 14px;
+  line-height: 20px;
+`
+const CautionTriangle = styled(AlertTriangle)`
+  color: ${({ theme }) => theme.accentWarning};
+`
+const Link = styled(ExternalLink)`
+  color: ${({ theme }) => theme.black};
+  text-decoration: underline;
+`
+const TitleRow = styled.div`
+  align-items: center;
+  display: flex;
+  justify-content: flex-start;
+  margin-bottom: 8px;
+`
+const TitleText = styled.div`
+  color: ${({ theme }) => theme.textPrimary};
+  font-weight: 500;
+  font-size: 16px;
+  line-height: 24px;
+  margin: 0px 12px;
+`
+const Wrapper = styled.div`
+  background-color: ${({ theme }) => theme.backgroundSurface};
+  border-radius: 12px;
+  border: 1px solid ${({ theme }) => theme.backgroundOutline};
+  bottom: 60px;
+  display: none;
+  max-width: 348px;
+  padding: 16px 20px;
+  position: fixed;
+  right: 16px;
+  @media screen and (min-width: ${MEDIA_WIDTHS.deprecated_upToMedium}px) {
+    display: block;
+  }
+`
+
+export function ChainConnectivityWarning() {
+  const { chainId } = useWeb3React()
+  const info = getChainInfoOrDefault(chainId)
+  const label = info?.label
+
+  return (
+    <Wrapper>
+      <TitleRow>
+        <CautionTriangle />
+        <TitleText>
+          <Trans>Network Warning</Trans>
+        </TitleText>
+      </TitleRow>
+      <BodyRow>
+        {chainId === SupportedChainId.MAINNET ? (
+          <Trans>You may have lost your network connection.</Trans>
+        ) : (
+          <Trans>{label} might be down right now, or you may have lost your network connection.</Trans>
+        )}{' '}
+        {(info as L2ChainInfo).statusPage !== undefined && (
+          <span>
+            <Trans>Check network status</Trans>{' '}
+            <Link href={(info as L2ChainInfo).statusPage || ''}>
+              <Trans>here.</Trans>
+            </Link>
+          </span>
+        )}
+      </BodyRow>
+    </Wrapper>
+  )
+}

src/components/Polling/index.tsx

+import { Trans } from '@lingui/macro'
+import { useWeb3React } from '@web3-react/core'
+import { RowFixed } from 'components/Row'
+import { getChainInfo } from 'constants/chainInfo'
+import useCurrentBlockTimestamp from 'hooks/useCurrentBlockTimestamp'
+import { useIsLandingPage } from 'hooks/useIsLandingPage'
+import { useIsNftPage } from 'hooks/useIsNftPage'
+import useMachineTimeMs from 'hooks/useMachineTime'
+import useBlockNumber from 'lib/hooks/useBlockNumber'
+import ms from 'ms.macro'
+import { useEffect, useMemo, useState } from 'react'
+import styled, { keyframes } from 'styled-components/macro'
+import { ExternalLink, ThemedText } from 'theme'
+import { ExplorerDataType, getExplorerLink } from 'utils/getExplorerLink'
+
+import { MouseoverTooltip } from '../Tooltip'
+import { ChainConnectivityWarning } from './ChainConnectivityWarning'
+
+const StyledPolling = styled.div`
+  align-items: center;
+  bottom: 0;
+  color: ${({ theme }) => theme.textTertiary};
+  display: none;
+  padding: 1rem;
+  position: fixed;
+  right: 0;
+  transition: 250ms ease color;
+
+  a {
+    color: unset;
+  }
+  a:hover {
+    color: unset;
+    text-decoration: none;
+  }
+
+  @media screen and (min-width: ${({ theme }) => theme.breakpoint.md}px) {
+    display: flex;
+  }
+`
+const StyledPollingBlockNumber = styled(ThemedText.DeprecatedSmall)<{
+  breathe: boolean
+  hovering: boolean
+  warning: boolean
+}>`
+  color: ${({ theme, warning }) => (warning ? theme.deprecated_yellow3 : theme.accentSuccess)};
+  transition: opacity 0.25s ease;
+  opacity: ${({ breathe, hovering }) => (hovering ? 0.7 : breathe ? 1 : 0.5)};
+  :hover {
+    opacity: 1;
+  }
+
+  a {
+    color: unset;
+  }
+  a:hover {
+    text-decoration: none;
+    color: unset;
+  }
+`
+const StyledPollingDot = styled.div<{ warning: boolean }>`
+  width: 8px;
+  height: 8px;
+  min-height: 8px;
+  min-width: 8px;
+  border-radius: 50%;
+  position: relative;
+  background-color: ${({ theme, warning }) => (warning ? theme.deprecated_yellow3 : theme.accentSuccess)};
+  transition: 250ms ease background-color;
+`
+
+const rotate360 = keyframes`
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+`
+
+const Spinner = styled.div<{ warning: boolean }>`
+  animation: ${rotate360} 1s cubic-bezier(0.83, 0, 0.17, 1) infinite;
+  transform: translateZ(0);
+
+  border-top: 1px solid transparent;
+  border-right: 1px solid transparent;
+  border-bottom: 1px solid transparent;
+  border-left: 2px solid ${({ theme, warning }) => (warning ? theme.deprecated_yellow3 : theme.accentSuccess)};
+  background: transparent;
+  width: 14px;
+  height: 14px;
+  border-radius: 50%;
+  position: relative;
+  transition: 250ms ease border-color;
+
+  left: -3px;
+  top: -3px;
+`
+
+const DEFAULT_MS_BEFORE_WARNING = ms`10m`
+const NETWORK_HEALTH_CHECK_MS = ms`10s`
+
+export default function Polling() {
+  const { chainId } = useWeb3React()
+  const blockNumber = useBlockNumber()
+  const [isMounting, setIsMounting] = useState(false)
+  const [isHover, setIsHover] = useState(false)
+  const machineTime = useMachineTimeMs(NETWORK_HEALTH_CHECK_MS)
+  const blockTime = useCurrentBlockTimestamp()
+  const isNftPage = useIsNftPage()
+  const isLandingPage = useIsLandingPage()
+
+  const waitMsBeforeWarning =
+    (chainId ? getChainInfo(chainId)?.blockWaitMsBeforeWarning : DEFAULT_MS_BEFORE_WARNING) ?? DEFAULT_MS_BEFORE_WARNING
+
+  const warning = Boolean(!!blockTime && machineTime - blockTime.mul(1000).toNumber() > waitMsBeforeWarning)
+
+  useEffect(
+    () => {
+      if (!blockNumber) {
+        return
+      }
+
+      setIsMounting(true)
+      const mountingTimer = setTimeout(() => setIsMounting(false), 1000)
+
+      // this will clear Timeout when component unmount like in willComponentUnmount
+      return () => {
+        clearTimeout(mountingTimer)
+      }
+    },
+    [blockNumber] //useEffect will run only one time
+    //if you pass a value to array, like this [data] than clearTimeout will run every time this value changes (useEffect re-run)
+  )
+
+  //TODO - chainlink gas oracle is really slow. Can we get a better data source?
+
+  const blockExternalLinkHref = useMemo(() => {
+    if (!chainId || !blockNumber) return ''
+    return getExplorerLink(chainId, blockNumber.toString(), ExplorerDataType.BLOCK)
+  }, [blockNumber, chainId])
+
+  if (isNftPage || isLandingPage) {
+    return null
+  }
+
+  return (
+    <RowFixed>
+      <StyledPolling onMouseEnter={() => setIsHover(true)} onMouseLeave={() => setIsHover(false)}>
+        <StyledPollingBlockNumber breathe={isMounting} hovering={isHover} warning={warning}>
+          <ExternalLink href={blockExternalLinkHref}>
+            <MouseoverTooltip
+              text={<Trans>The most recent block number on this network. Prices update on every block.</Trans>}
+            >
+              {blockNumber}&ensp;
+            </MouseoverTooltip>
+          </ExternalLink>
+        </StyledPollingBlockNumber>
+        <StyledPollingDot warning={warning}>{isMounting && <Spinner warning={warning} />}</StyledPollingDot>{' '}
+      </StyledPolling>
+      {warning && <ChainConnectivityWarning />}
+    </RowFixed>
+  )
+}

src/constants/chainInfo.ts

@@ -42,7 +42,7 @@ interface L1ChainInfo extends BaseChainInfo {
   readonly defaultListUrl?: string
 }
 
-interface L2ChainInfo extends BaseChainInfo {
+export interface L2ChainInfo extends BaseChainInfo {
   readonly networkType: NetworkType.L2
   readonly bridge: string
   readonly statusPage?: string

src/hooks/useIsLandingPage.ts

+import { useLocation } from 'react-router-dom'
+
+export function useIsLandingPage() {
+  const { pathname } = useLocation()
+  return pathname.endsWith('/')
+}

src/hooks/useMachineTime.ts

+import useInterval from 'lib/hooks/useInterval'
+import { useCallback, useState } from 'react'
+
+const useMachineTimeMs = (updateInterval: number): number => {
+  const [now, setNow] = useState(Date.now())
+
+  useInterval(
+    useCallback(() => {
+      setNow(Date.now())
+    }, []),
+    updateInterval
+  )
+  return now
+}
+
+export default useMachineTimeMs

src/pages/App.tsx

@@ -20,6 +20,7 @@ import { useAnalyticsReporter } from '../components/analytics'
 import ErrorBoundary from '../components/ErrorBoundary'
 import { PageTabs } from '../components/NavBar'
 import NavBar from '../components/NavBar'
+import Polling from '../components/Polling'
 import Popups from '../components/Popups'
 import { useIsExpertMode } from '../state/user/hooks'
 import DarkModeQueryParamReader from '../theme/components/DarkModeQueryParamReader'
@@ -193,6 +194,7 @@ export default function App() {
         </HeaderWrapper>
         <BodyWrapper>
           <Popups />
+          <Polling />
           <TopLevelModals />
           <Suspense fallback={<Loader />}>
             {isLoaded ? (