@hyperlane-xyz/utils/dist/rpc.js

General utilities and types for the Hyperlane network

import { rootLogger } from './logging.js';
/**
 * Applies RPC URL overrides from environment variables.
 * Looks for variables with the form RPC_URL_<CHAIN_NAME>.
 */
export function applyRpcUrlOverridesFromEnv(chainMetadata, options = {}) {
    const overriddenChains = [];
    const chainNames = options.chainNames ?? Object.keys(chainMetadata);
    const env = options.env ?? process.env;
    for (const chain of chainNames) {
        const metadata = chainMetadata[chain];
        if (!metadata)
            continue;
        const envVarName = `RPC_URL_${chain.toUpperCase().replace(/-/g, '_')}`;
        const rpcUrl = env[envVarName];
        if (!rpcUrl)
            continue;
        rootLogger.debug({ chain, envVarName }, 'Using RPC from environment variable');
        metadata.rpcUrls = [{ http: rpcUrl }];
        overriddenChains.push(chain);
    }
    return overriddenChains;
}
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