@nomiclabs/buidler
Version:
Buidler is an extensible developer tool that helps smart contract developers increase productivity by reliably bringing together the tools they want.
74 lines • 3.01 kB
JavaScript
;
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
result["default"] = mod;
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const events_1 = require("events");
const jsonrpc_1 = require("../../util/jsonrpc");
const errors_1 = require("../errors");
const errors_list_1 = require("../errors-list");
function isErrorResponse(response) {
return typeof response.error !== "undefined";
}
class HttpProvider extends events_1.EventEmitter {
constructor(_url, _networkName, _extraHeaders = {}, _timeout = 20000) {
super();
this._url = _url;
this._networkName = _networkName;
this._extraHeaders = _extraHeaders;
this._timeout = _timeout;
this._nextRequestId = 1;
}
async send(method, params) {
// We create the error here to capture the stack traces at this point,
// the async call that follows would probably loose of the stack trace
const error = new Error();
const jsonRpcRequest = this._getJsonRpcRequest(method, params);
const jsonRpcResponse = await this._fetchJsonRpcResponse(jsonRpcRequest);
if (isErrorResponse(jsonRpcResponse)) {
error.message = jsonRpcResponse.error.message;
error.code = jsonRpcResponse.error.code;
error.data = jsonRpcResponse.error.data;
// tslint:disable-next-line only-buidler-error
throw error;
}
return jsonRpcResponse.result;
}
async _fetchJsonRpcResponse(request) {
const { default: fetch } = await Promise.resolve().then(() => __importStar(require("node-fetch")));
try {
const response = await fetch(this._url, {
method: "POST",
body: JSON.stringify(request),
redirect: "follow",
timeout: this._timeout,
headers: Object.assign({ "Content-Type": "application/json" }, this._extraHeaders),
});
return jsonrpc_1.parseJsonResponse(await response.text());
}
catch (error) {
if (error.code === "ECONNREFUSED") {
throw new errors_1.BuidlerError(errors_list_1.ERRORS.NETWORK.NODE_IS_NOT_RUNNING, { network: this._networkName }, error);
}
if (error.type === "request-timeout") {
throw new errors_1.BuidlerError(errors_list_1.ERRORS.NETWORK.NETWORK_TIMEOUT, {}, error);
}
// tslint:disable-next-line only-buidler-error
throw error;
}
}
_getJsonRpcRequest(method, params = []) {
return {
jsonrpc: "2.0",
method,
params,
id: this._nextRequestId++,
};
}
}
exports.HttpProvider = HttpProvider;
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