viem/_esm/utils/rpc/webSocket.js

TypeScript Interface for Ethereum

import { WebSocketRequestError } from '../../errors/request.js';
import { getSocketRpcClient, } from './socket.js';
export async function getWebSocketRpcClient(url, options = {}) {
    const { keepAlive, reconnect } = options;
    return getSocketRpcClient({
        async getSocket({ onClose, onError, onOpen, onResponse }) {
            const WebSocket = await import('isows').then((module) => module.WebSocket);
            const socket = new WebSocket(url);
            function onClose_() {
                onClose();
                socket.removeEventListener('close', onClose_);
                socket.removeEventListener('message', onMessage);
                socket.removeEventListener('error', onError);
                socket.removeEventListener('open', onOpen);
            }
            function onMessage({ data }) {
                onResponse(JSON.parse(data));
            }
            // Setup event listeners for RPC & subscription responses.
            socket.addEventListener('close', onClose_);
            socket.addEventListener('message', onMessage);
            socket.addEventListener('error', onError);
            socket.addEventListener('open', onOpen);
            // Wait for the socket to open.
            if (socket.readyState === WebSocket.CONNECTING) {
                await new Promise((resolve, reject) => {
                    if (!socket)
                        return;
                    socket.onopen = resolve;
                    socket.onerror = reject;
                });
            }
            const { close: close_ } = socket;
            return Object.assign(socket, {
                close() {
                    close_.bind(socket)();
                    onClose();
                },
                ping() {
                    try {
                        if (socket.readyState === socket.CLOSED ||
                            socket.readyState === socket.CLOSING)
                            throw new WebSocketRequestError({
                                body: {},
                                url: socket.url,
                                details: 'Socket is closed.',
                            });
                        socket.send('ping');
                    }
                    catch (error) {
                        onError(error);
                    }
                },
                request({ body }) {
                    if (socket.readyState === socket.CLOSED ||
                        socket.readyState === socket.CLOSING)
                        throw new WebSocketRequestError({
                            body,
                            url: socket.url,
                            details: 'Socket is closed.',
                        });
                    return socket.send(JSON.stringify(body));
                },
            });
        },
        keepAlive,
        reconnect,
        url,
    });
}
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