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add RPC fallback #26

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Merged
timbrinded merged 1 commit into from
Mar 12, 2026
Merged

add RPC fallback #26

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6 changes: 6 additions & 0 deletions fe/.env.example
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Original file line number Diff line number Diff line change
@@ -1,2 +1,8 @@
CRE_HELPER_SERVER_URL=http://localhost:3000
CRE_HELPER_API_KEY=replace-me
VITE_WALLETCONNECT_PROJECT_ID=replace-me
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Copilot AI Mar 12, 2026

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In .env.example, setting VITE_WALLETCONNECT_PROJECT_ID=replace-me will override the in-code fallback ("demo") and likely break WalletConnect for anyone who copies this file verbatim. Consider leaving it blank/commented out or setting it to demo with a note that a real project id is required for production.

Suggested change
VITE_WALLETCONNECT_PROJECT_ID=replace-me
# WalletConnect project id. "demo" is suitable for local development only;
# replace this with a real project id for production.
VITE_WALLETCONNECT_PROJECT_ID=demo

Copilot uses AI. Check for mistakes.

# Optional comma-separated overrides for RPC priority.
VITE_SEPOLIA_RPC_URLS=https://sepolia.drpc.org,https://ethereum-sepolia-rpc.publicnode.com
VITE_BASE_SEPOLIA_RPC_URLS=https://sepolia.base.org,https://base-sepolia-rpc.publicnode.com
VITE_ARBITRUM_SEPOLIA_RPC_URLS=https://sepolia-rollup.arbitrum.io/rpc,https://arbitrum-sepolia-rpc.publicnode.com
46 changes: 42 additions & 4 deletions fe/app/config/wagmi.ts
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Original file line number Diff line number Diff line change
@@ -1,17 +1,55 @@
import { getDefaultConfig } from "@rainbow-me/rainbowkit";
import { cookieStorage, createStorage, http } from "wagmi";
import { cookieStorage, createStorage, fallback, http } from "wagmi";
import { arbitrumSepolia, baseSepolia, sepolia } from "wagmi/chains";

const RPC_TIMEOUT_MS = 2_500;

const splitRpcUrls = (value: string | undefined) =>
value
?.split(",")
.map((url) => url.trim())
.filter(Boolean) ?? [];
Comment on lines +10 to +11
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Copilot AI Mar 12, 2026

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splitRpcUrls will throw when the env var is undefined. value?.split(",") returns undefined when value is missing, but .map(...) then runs on that undefined. Use optional chaining for the whole chain (e.g. value?.split(",")?.map(... )?.filter(...) ?? []) or parenthesize the split result before mapping.

Suggested change
.map((url) => url.trim())
.filter(Boolean) ?? [];
?.map((url) => url.trim())
?.filter(Boolean) ?? [];

Copilot uses AI. Check for mistakes.

const uniqueRpcUrls = (urls: string[]) => [...new Set(urls)];

const createFallbackTransport = (urls: string[]) =>
fallback(
uniqueRpcUrls(urls).map((url) => http(url, { timeout: RPC_TIMEOUT_MS })),
{ retryCount: 0 },
);

const sepoliaRpcUrls = [
...splitRpcUrls(import.meta.env.VITE_SEPOLIA_RPC_URLS),
"https://sepolia.drpc.org",
"https://ethereum-sepolia-rpc.publicnode.com",
"https://sepolia.gateway.tenderly.co",
...sepolia.rpcUrls.default.http,
];

const baseSepoliaRpcUrls = [
...splitRpcUrls(import.meta.env.VITE_BASE_SEPOLIA_RPC_URLS),
...baseSepolia.rpcUrls.default.http,
"https://base-sepolia-rpc.publicnode.com",
"https://base-sepolia.drpc.org",
];

const arbitrumSepoliaRpcUrls = [
...splitRpcUrls(import.meta.env.VITE_ARBITRUM_SEPOLIA_RPC_URLS),
...arbitrumSepolia.rpcUrls.default.http,
"https://arbitrum-sepolia-rpc.publicnode.com",
"https://arbitrum-sepolia.drpc.org",
];

export const config = getDefaultConfig({
appName: "CRE Examples",
projectId: import.meta.env.VITE_WALLETCONNECT_PROJECT_ID ?? "demo",
chains: [sepolia, baseSepolia, arbitrumSepolia],
ssr: true,
storage: createStorage({ storage: cookieStorage }),
transports: {
[sepolia.id]: http(sepolia.rpcUrls.default.http[0]),
[baseSepolia.id]: http(baseSepolia.rpcUrls.default.http[0]),
[arbitrumSepolia.id]: http(arbitrumSepolia.rpcUrls.default.http[0]),
[sepolia.id]: createFallbackTransport(sepoliaRpcUrls),
[baseSepolia.id]: createFallbackTransport(baseSepoliaRpcUrls),
[arbitrumSepolia.id]: createFallbackTransport(arbitrumSepoliaRpcUrls),
},
});

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