fix: change polling interval per network (#1898)

src/utils/getLibrary.ts

 import { Web3Provider } from '@ethersproject/providers'
+import { SupportedChainId } from '../constants/chains'
+
+const NETWORK_POLLING_INTERVALS: { [chainId: number]: number } = {
+  [SupportedChainId.ARBITRUM_ONE]: 1_000,
+  [SupportedChainId.ARBITRUM_KOVAN]: 1_000,
+}
 
 export default function getLibrary(provider: any): Web3Provider {
   const library = new Web3Provider(
@@ -9,7 +15,13 @@ export default function getLibrary(provider: any): Web3Provider {
       ? parseInt(provider.chainId)
       : 'any'
   )
-  // TODO: this should depend on the network block time
   library.pollingInterval = 15_000
+  library.detectNetwork().then((network) => {
+    const networkPollingInterval = NETWORK_POLLING_INTERVALS[network.chainId]
+    if (networkPollingInterval) {
+      console.debug('Setting polling interval', networkPollingInterval)
+      library.pollingInterval = networkPollingInterval
+    }
+  })
   return library
 }