viem/_esm/clients/transports/http.js

TypeScript Interface for Ethereum

import { RpcRequestError } from '../../errors/request.js';
import { UrlRequiredError, } from '../../errors/transport.js';
import { createBatchScheduler } from '../../utils/promise/createBatchScheduler.js';
import { getHttpRpcClient, } from '../../utils/rpc/http.js';
import { createTransport, } from './createTransport.js';
/**
 * @description Creates a HTTP transport that connects to a JSON-RPC API.
 */
export function http(
/** URL of the JSON-RPC API. Defaults to the chain's public RPC URL. */
url, config = {}) {
    const { batch, fetchOptions, key = 'http', methods, name = 'HTTP JSON-RPC', onFetchRequest, onFetchResponse, retryDelay, raw, } = config;
    return ({ chain, retryCount: retryCount_, timeout: timeout_ }) => {
        const { batchSize = 1000, wait = 0 } = typeof batch === 'object' ? batch : {};
        const retryCount = config.retryCount ?? retryCount_;
        const timeout = timeout_ ?? config.timeout ?? 10_000;
        const url_ = url || chain?.rpcUrls.default.http[0];
        if (!url_)
            throw new UrlRequiredError();
        const rpcClient = getHttpRpcClient(url_, {
            fetchOptions,
            onRequest: onFetchRequest,
            onResponse: onFetchResponse,
            timeout,
        });
        return createTransport({
            key,
            methods,
            name,
            async request({ method, params }) {
                const body = { method, params };
                const { schedule } = createBatchScheduler({
                    id: url_,
                    wait,
                    shouldSplitBatch(requests) {
                        return requests.length > batchSize;
                    },
                    fn: (body) => rpcClient.request({
                        body,
                    }),
                    sort: (a, b) => a.id - b.id,
                });
                const fn = async (body) => batch
                    ? schedule(body)
                    : [
                        await rpcClient.request({
                            body,
                        }),
                    ];
                const [{ error, result }] = await fn(body);
                if (raw)
                    return { error, result };
                if (error)
                    throw new RpcRequestError({
                        body,
                        error,
                        url: url_,
                    });
                return result;
            },
            retryCount,
            retryDelay,
            timeout,
            type: 'http',
        }, {
            fetchOptions,
            url: url_,
        });
    };
}
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