Parameterize erigon node url

public/config.json

@@ -0,0 +1,3 @@
+{
+  "erigonURL": "http://localhost:8545"
+}

src/AddressTransactions.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useMemo } from "react";
+import React, { useState, useEffect, useMemo, useContext } from "react";
 import { useParams, useLocation, useHistory } from "react-router-dom";
 import { ethers } from "ethers";
 import queryString from "query-string";
@@ -12,9 +12,9 @@ import ResultHeader from "./search/ResultHeader";
 import PendingResults from "./search/PendingResults";
 import TransactionItem from "./search/TransactionItem";
 import { SearchController } from "./search/search";
+import { ProviderContext } from "./useProvider";
 import { useENSCache } from "./useReverseCache";
 import { useFeeToggler } from "./search/useFeeToggler";
-import { provider } from "./ethersconfig";
 
 type BlockParams = {
   addressOrName: string;
@@ -26,6 +26,7 @@ type PageParams = {
 };
 
 const AddressTransactions: React.FC = () => {
+  const provider = useContext(ProviderContext);
   const params = useParams<BlockParams>();
   const location = useLocation<PageParams>();
   const history = useHistory();
@@ -59,6 +60,9 @@ const AddressTransactions: React.FC = () => {
       return;
     }
 
+    if (!provider) {
+      return;
+    }
     const resolveName = async () => {
       const resolvedAddress = await provider.resolveName(params.addressOrName);
       if (resolvedAddress !== null) {
@@ -72,20 +76,30 @@ const AddressTransactions: React.FC = () => {
       }
     };
     resolveName();
-  }, [params.addressOrName, history, params.direction, location.search]);
+  }, [
+    provider,
+    params.addressOrName,
+    history,
+    params.direction,
+    location.search,
+  ]);
 
   const [controller, setController] = useState<SearchController>();
   useEffect(() => {
-    if (!checksummedAddress) {
+    if (!provider || !checksummedAddress) {
       return;
     }
 
     const readFirstPage = async () => {
-      const _controller = await SearchController.firstPage(checksummedAddress);
+      const _controller = await SearchController.firstPage(
+        provider,
+        checksummedAddress
+      );
       setController(_controller);
     };
     const readMiddlePage = async (next: boolean) => {
       const _controller = await SearchController.middlePage(
+        provider,
         checksummedAddress,
         hash!,
         next
@@ -93,15 +107,18 @@ const AddressTransactions: React.FC = () => {
       setController(_controller);
     };
     const readLastPage = async () => {
-      const _controller = await SearchController.lastPage(checksummedAddress);
+      const _controller = await SearchController.lastPage(
+        provider,
+        checksummedAddress
+      );
       setController(_controller);
     };
     const prevPage = async () => {
-      const _controller = await controller!.prevPage(hash!);
+      const _controller = await controller!.prevPage(provider, hash!);
       setController(_controller);
     };
     const nextPage = async () => {
-      const _controller = await controller!.nextPage(hash!);
+      const _controller = await controller!.nextPage(provider, hash!);
       setController(_controller);
     };
 
@@ -127,10 +144,10 @@ const AddressTransactions: React.FC = () => {
         readLastPage();
       }
     }
-  }, [checksummedAddress, params.direction, hash, controller]);
+  }, [provider, checksummedAddress, params.direction, hash, controller]);
 
   const page = useMemo(() => controller?.getPage(), [controller]);
-  const reverseCache = useENSCache(page);
+  const reverseCache = useENSCache(provider, page);
 
   document.title = `Address ${params.addressOrName} | Otterscan`;
 

src/App.tsx

@@ -3,14 +3,19 @@ import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
 import Home from "./Home";
 import Search from "./Search";
 import Title from "./Title";
+import { useProvider, ProviderContext } from "./useProvider";
 
 const Block = React.lazy(() => import("./Block"));
 const BlockTransactions = React.lazy(() => import("./BlockTransactions"));
 const AddressTransactions = React.lazy(() => import("./AddressTransactions"));
 const Transaction = React.lazy(() => import("./Transaction"));
 
-const App = () => (
+const App = () => {
+  const provider = useProvider();
+
+  return (
     <Suspense fallback={<>LOADING</>}>
+      <ProviderContext.Provider value={provider}>
         <Router>
           <Switch>
             <Route path="/" exact>
@@ -36,7 +41,9 @@ const App = () => (
             </Route>
           </Switch>
         </Router>
+      </ProviderContext.Provider>
     </Suspense>
   );
+};
 
 export default React.memo(App);

src/Block.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState, useMemo } from "react";
+import React, { useEffect, useState, useMemo, useContext } from "react";
 import { useParams, NavLink } from "react-router-dom";
 import { ethers, BigNumber } from "ethers";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
@@ -6,7 +6,6 @@ import {
   faChevronLeft,
   faChevronRight,
 } from "@fortawesome/free-solid-svg-icons";
-import { provider } from "./ethersconfig";
 import StandardFrame from "./StandardFrame";
 import StandardSubtitle from "./StandardSubtitle";
 import ContentFrame from "./ContentFrame";
@@ -17,6 +16,7 @@ import BlockLink from "./components/BlockLink";
 import AddressOrENSName from "./components/AddressOrENSName";
 import TransactionValue from "./components/TransactionValue";
 import HexValue from "./components/HexValue";
+import { ProviderContext } from "./useProvider";
 import { useLatestBlockNumber } from "./useLatestBlock";
 
 type BlockParams = {
@@ -34,10 +34,15 @@ interface ExtendedBlock extends ethers.providers.Block {
 }
 
 const Block: React.FC = () => {
+  const provider = useContext(ProviderContext);
   const params = useParams<BlockParams>();
 
   const [block, setBlock] = useState<ExtendedBlock>();
   useEffect(() => {
+    if (!provider) {
+      return;
+    }
+
     const readBlock = async () => {
       let blockPromise: Promise<any>;
       if (ethers.utils.isHexString(params.blockNumberOrHash, 32)) {
@@ -80,7 +85,7 @@ const Block: React.FC = () => {
       setBlock(extBlock);
     };
     readBlock();
-  }, [params.blockNumberOrHash]);
+  }, [provider, params.blockNumberOrHash]);
 
   useEffect(() => {
     if (block) {
@@ -97,7 +102,7 @@ const Block: React.FC = () => {
     }
   }, [block]);
 
-  const latestBlockNumber = useLatestBlockNumber();
+  const latestBlockNumber = useLatestBlockNumber(provider);
 
   return (
     <StandardFrame>

src/BlockTransactions.tsx

@@ -1,8 +1,7 @@
-import React, { useEffect, useState, useMemo } from "react";
+import React, { useEffect, useState, useMemo, useContext } from "react";
 import { useParams, useLocation } from "react-router";
 import { ethers } from "ethers";
 import queryString from "query-string";
-import { provider } from "./ethersconfig";
 import StandardFrame from "./StandardFrame";
 import StandardSubtitle from "./StandardSubtitle";
 import ContentFrame from "./ContentFrame";
@@ -14,6 +13,7 @@ import BlockLink from "./components/BlockLink";
 import { ProcessedTransaction } from "./types";
 import { PAGE_SIZE } from "./params";
 import { useFeeToggler } from "./search/useFeeToggler";
+import { ProviderContext } from "./useProvider";
 import { useENSCache } from "./useReverseCache";
 
 type BlockParams = {
@@ -25,6 +25,7 @@ type PageParams = {
 };
 
 const BlockTransactions: React.FC = () => {
+  const provider = useContext(ProviderContext);
   const params = useParams<BlockParams>();
   const location = useLocation<PageParams>();
   const qs = queryString.parse(location.search);
@@ -42,6 +43,10 @@ const BlockTransactions: React.FC = () => {
 
   const [txs, setTxs] = useState<ProcessedTransaction[]>();
   useEffect(() => {
+    if (!provider) {
+      return;
+    }
+
     const readBlock = async () => {
       const [_block, _receipts] = await Promise.all([
         provider.getBlockWithTransactions(blockNumber.toNumber()),
@@ -94,7 +99,7 @@ const BlockTransactions: React.FC = () => {
       setTxs(processedResponses);
     };
     readBlock();
-  }, [blockNumber]);
+  }, [provider, blockNumber]);
 
   const page = useMemo(() => {
     if (!txs) {
@@ -105,7 +110,7 @@ const BlockTransactions: React.FC = () => {
   }, [txs, pageNumber]);
   const total = useMemo(() => txs?.length ?? 0, [txs]);
 
-  const reverseCache = useENSCache(page);
+  const reverseCache = useENSCache(provider, page);
 
   document.title = `Block #${blockNumber} Txns | Otterscan`;
 

src/Home.tsx

@@ -1,12 +1,13 @@
-import React, { useState } from "react";
+import React, { useState, useContext } from "react";
 import { NavLink, useHistory } from "react-router-dom";
 import { ethers } from "ethers";
 import Logo from "./Logo";
 import Timestamp from "./components/Timestamp";
+import { ProviderContext } from "./useProvider";
 import { useLatestBlock } from "./useLatestBlock";
-import { ERIGON_NODE } from "./ethersconfig";
 
 const Home: React.FC = () => {
+  const provider = useContext(ProviderContext);
   const [search, setSearch] = useState<string>();
   const [canSubmit, setCanSubmit] = useState<boolean>(false);
   const history = useHistory();
@@ -25,7 +26,7 @@ const Home: React.FC = () => {
     history.push(`/search?q=${search}`);
   };
 
-  const latestBlock = useLatestBlock();
+  const latestBlock = useLatestBlock(provider);
 
   document.title = "Home | Otterscan";
 
@@ -65,7 +66,11 @@ const Home: React.FC = () => {
             </NavLink>
           )}
           <span className="mx-auto mt-5 text-xs text-gray-500">
-            Using Erigon node at {ERIGON_NODE}
+            {provider ? (
+              <>Using Erigon node at {provider.connection.url}</>
+            ) : (
+              <>Waiting for the provider...</>
+            )}
           </span>
         </form>
       </div>

src/Transaction.tsx

@@ -1,4 +1,10 @@
-import React, { useState, useEffect, useCallback, useMemo } from "react";
+import React, {
+  useState,
+  useEffect,
+  useCallback,
+  useMemo,
+  useContext,
+} from "react";
 import { Route, Switch, useParams } from "react-router-dom";
 import { BigNumber, ethers } from "ethers";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
@@ -6,7 +12,6 @@ import {
   faCheckCircle,
   faTimesCircle,
 } from "@fortawesome/free-solid-svg-icons";
-import { provider } from "./ethersconfig";
 import StandardFrame from "./StandardFrame";
 import StandardSubtitle from "./StandardSubtitle";
 import Tab from "./components/Tab";
@@ -22,6 +27,7 @@ import FormattedBalance from "./components/FormattedBalance";
 import TokenTransferItem from "./TokenTransferItem";
 import erc20 from "./erc20.json";
 import { TokenMetas, TokenTransfer, TransactionData, Transfer } from "./types";
+import { ProviderContext } from "./useProvider";
 
 const TRANSFER_TOPIC =
   "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef";
@@ -31,11 +37,16 @@ type TransactionParams = {
 };
 
 const Transaction: React.FC = () => {
+  const provider = useContext(ProviderContext);
   const params = useParams<TransactionParams>();
   const { txhash } = params;
 
   const [txData, setTxData] = useState<TransactionData>();
   useEffect(() => {
+    if (!provider) {
+      return;
+    }
+
     const readBlock = async () => {
       const [_response, _receipt] = await Promise.all([
         provider.getTransaction(txhash),
@@ -109,7 +120,7 @@ const Transaction: React.FC = () => {
       });
     };
     readBlock();
-  }, [txhash]);
+  }, [provider, txhash]);
 
   const [transfers, setTransfers] = useState<Transfer[]>();
   const sendsEthToMiner = useMemo(() => {
@@ -126,7 +137,7 @@ const Transaction: React.FC = () => {
   }, [txData, transfers]);
 
   const traceTransfersUsingOtsTrace = useCallback(async () => {
-    if (!txData) {
+    if (!provider || !txData) {
       return;
     }
 
@@ -143,7 +154,7 @@ const Transaction: React.FC = () => {
     }
 
     setTransfers(_transfers);
-  }, [txData]);
+  }, [provider, txData]);
   useEffect(() => {
     traceTransfersUsingOtsTrace();
   }, [traceTransfersUsingOtsTrace]);

src/ethersconfig.ts

@@ -1,9 +0,0 @@
-import { ethers } from "ethers";
-
-export const ERIGON_NODE =
-  process.env.REACT_APP_ERIGON_URL || "http://127.0.0.1:8545";
-
-export const provider = new ethers.providers.JsonRpcProvider(
-  ERIGON_NODE,
-  "mainnet"
-);

src/search/search.ts

@@ -1,5 +1,4 @@
 import { ethers } from "ethers";
-import { provider } from "../ethersconfig";
 import { PAGE_SIZE } from "../params";
 import { ProcessedTransaction, TransactionChunk } from "../types";
 
@@ -27,7 +26,10 @@ export class SearchController {
     }
   }
 
-  private static rawToProcessed = (_rawRes: any) => {
+  private static rawToProcessed = (
+    provider: ethers.providers.JsonRpcProvider,
+    _rawRes: any
+  ) => {
     const _res: ethers.providers.TransactionResponse[] = _rawRes.txs.map(
       (t: any) => provider.formatter.transactionResponse(t)
     );
@@ -56,6 +58,7 @@ export class SearchController {
   };
 
   private static async readBackPage(
+    provider: ethers.providers.JsonRpcProvider,
     address: string,
     baseBlock: number
   ): Promise<TransactionChunk> {
@@ -64,10 +67,11 @@ export class SearchController {
       baseBlock,
       PAGE_SIZE,
     ]);
-    return this.rawToProcessed(_rawRes);
+    return this.rawToProcessed(provider, _rawRes);
   }
 
   private static async readForwardPage(
+    provider: ethers.providers.JsonRpcProvider,
     address: string,
     baseBlock: number
   ): Promise<TransactionChunk> {
@@ -76,11 +80,14 @@ export class SearchController {
       baseBlock,
       PAGE_SIZE,
     ]);
-    return this.rawToProcessed(_rawRes);
+    return this.rawToProcessed(provider, _rawRes);
   }
 
-  static async firstPage(address: string): Promise<SearchController> {
+  static async firstPage(
-    const newTxs = await SearchController.readBackPage(address, 0);
+    provider: ethers.providers.JsonRpcProvider,
+    address: string
+  ): Promise<SearchController> {
+    const newTxs = await SearchController.readBackPage(provider, address, 0);
     return new SearchController(
       address,
       newTxs.txs,
@@ -91,14 +98,19 @@ export class SearchController {
   }
 
   static async middlePage(
+    provider: ethers.providers.JsonRpcProvider,
     address: string,
     hash: string,
     next: boolean
   ): Promise<SearchController> {
     const tx = await provider.getTransaction(hash);
     const newTxs = next
-      ? await SearchController.readBackPage(address, tx.blockNumber!)
+      ? await SearchController.readBackPage(provider, address, tx.blockNumber!)
-      : await SearchController.readForwardPage(address, tx.blockNumber!);
+      : await SearchController.readForwardPage(
+          provider,
+          address,
+          tx.blockNumber!
+        );
     return new SearchController(
       address,
       newTxs.txs,
@@ -108,8 +120,11 @@ export class SearchController {
     );
   }
 
-  static async lastPage(address: string): Promise<SearchController> {
+  static async lastPage(
-    const newTxs = await SearchController.readForwardPage(address, 0);
+    provider: ethers.providers.JsonRpcProvider,
+    address: string
+  ): Promise<SearchController> {
+    const newTxs = await SearchController.readForwardPage(provider, address, 0);
     return new SearchController(
       address,
       newTxs.txs,
@@ -123,7 +138,10 @@ export class SearchController {
     return this.txs.slice(this.pageStart, this.pageEnd);
   }
 
-  async prevPage(hash: string): Promise<SearchController> {
+  async prevPage(
+    provider: ethers.providers.JsonRpcProvider,
+    hash: string
+  ): Promise<SearchController> {
     // Already on this page
     if (this.txs[this.pageEnd - 1].hash === hash) {
       return this;
@@ -133,6 +151,7 @@ export class SearchController {
       const overflowPage = this.txs.slice(0, this.pageStart);
       const baseBlock = this.txs[0].blockNumber;
       const prevPage = await SearchController.readForwardPage(
+        provider,
         this.address,
         baseBlock
       );
@@ -148,7 +167,10 @@ export class SearchController {
     return this;
   }
 
-  async nextPage(hash: string): Promise<SearchController> {
+  async nextPage(
+    provider: ethers.providers.JsonRpcProvider,
+    hash: string
+  ): Promise<SearchController> {
     // Already on this page
     if (this.txs[this.pageStart].hash === hash) {
       return this;
@@ -158,6 +180,7 @@ export class SearchController {
       const overflowPage = this.txs.slice(this.pageEnd);
       const baseBlock = this.txs[this.txs.length - 1].blockNumber;
       const nextPage = await SearchController.readBackPage(
+        provider,
         this.address,
         baseBlock
       );

src/useErigon.ts

@@ -0,0 +1,25 @@
+import { useState, useEffect } from "react";
+
+export type OtterscanConfig = {
+  erigonURL: string;
+};
+
+export const useErigon = (): [boolean?, OtterscanConfig?] => {
+  const [configOK, setConfigOK] = useState<boolean>();
+  const [config, setConfig] = useState<OtterscanConfig>();
+
+  useEffect(() => {
+    const readConfig = async () => {
+      const res = await fetch("/config.json");
+
+      if (res.ok) {
+        const _config: OtterscanConfig = await res.json();
+        setConfig(_config);
+        setConfigOK(res.ok);
+      }
+    };
+    readConfig();
+  }, []);
+
+  return [configOK, config];
+};

src/useLatestBlock.ts

@@ -1,11 +1,14 @@
 import { useState, useEffect } from "react";
 import { ethers } from "ethers";
-import { provider } from "./ethersconfig";
 
-export const useLatestBlock = () => {
+export const useLatestBlock = (provider?: ethers.providers.JsonRpcProvider) => {
   const [latestBlock, setLatestBlock] = useState<ethers.providers.Block>();
 
   useEffect(() => {
+    if (!provider) {
+      return;
+    }
+
     const readLatestBlock = async () => {
       const blockNum = await provider.getBlockNumber();
       const _raw = await provider.send("erigon_getHeaderByNumber", [blockNum]);
@@ -26,15 +29,21 @@ export const useLatestBlock = () => {
     return () => {
       provider.removeListener("block", listener);
     };
-  }, []);
+  }, [provider]);
 
   return latestBlock;
 };
 
-export const useLatestBlockNumber = () => {
+export const useLatestBlockNumber = (
+  provider?: ethers.providers.JsonRpcProvider
+) => {
   const [latestBlock, setLatestBlock] = useState<number>();
 
   useEffect(() => {
+    if (!provider) {
+      return;
+    }
+
     const readLatestBlock = async () => {
       const blockNum = await provider.getBlockNumber();
       setLatestBlock(blockNum);
@@ -49,7 +58,7 @@ export const useLatestBlockNumber = () => {
     return () => {
       provider.removeListener("block", listener);
     };
-  }, []);
+  }, [provider]);
 
   return latestBlock;
 };

src/useProvider.ts

@@ -0,0 +1,26 @@
+import React from "react";
+import { ethers } from "ethers";
+import { useErigon } from "./useErigon";
+
+export const DEFAULT_ERIGON_URL = "http://127.0.0.1:8545";
+
+export const useProvider = (): ethers.providers.JsonRpcProvider | undefined => {
+  const [configOK, config] = useErigon();
+  if (!configOK) {
+    return undefined;
+  }
+
+  let erigonURL = config?.erigonURL;
+  if (erigonURL === "") {
+    console.info(`Using default erigon URL: ${DEFAULT_ERIGON_URL}`);
+    erigonURL = DEFAULT_ERIGON_URL;
+  } else {
+    console.log(`Using configured erigon URL: ${erigonURL}`);
+  }
+
+  return new ethers.providers.JsonRpcProvider(erigonURL, "mainnet");
+};
+
+export const ProviderContext = React.createContext<
+  ethers.providers.JsonRpcProvider | undefined
+>(undefined);

src/useReverseCache.ts

@@ -1,12 +1,15 @@
 import { useState, useEffect } from "react";
+import { ethers } from "ethers";
 import { ENSReverseCache, ProcessedTransaction } from "./types";
-import { provider } from "./ethersconfig";
 
-export const useENSCache = (page?: ProcessedTransaction[]) => {
+export const useENSCache = (
+  provider?: ethers.providers.JsonRpcProvider,
+  page?: ProcessedTransaction[]
+) => {
   const [reverseCache, setReverseCache] = useState<ENSReverseCache>();
 
   useEffect(() => {
-    if (!page) {
+    if (!provider || !page) {
       return;
     }
 
@@ -38,7 +41,7 @@ export const useENSCache = (page?: ProcessedTransaction[]) => {
       setReverseCache(cache);
     };
     reverseResolve();
-  }, [page]);
+  }, [provider, page]);
 
   return reverseCache;
 };