"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.CallBuilder = void 0;
var _urijs = _interopRequireDefault(require("urijs"));
var _URITemplate = _interopRequireDefault(require("urijs/src/URITemplate"));
var _errors = require("../errors");
var _horizon_axios_client = require("./horizon_axios_client");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
// Resources which can be included in the Horizon response via the `join`
// query-param.
const JOINABLE = ["transaction"];
const anyGlobal = global;
// require("eventsource") for Node and React Native environment
let EventSource = anyGlobal.EventSource ?? anyGlobal.window?.EventSource ?? require("eventsource");
/**
* Creates a new {@link CallBuilder} pointed to server defined by serverUrl.
*
* This is an **abstract** class. Do not create this object directly, use {@link Server} class.
* @param {string} serverUrl URL of Horizon server
* @class CallBuilder
*/
class CallBuilder {
constructor(serverUrl, neighborRoot = "") {
this.url = serverUrl.clone();
this.filter = [];
this.originalSegments = this.url.segment() || [];
this.neighborRoot = neighborRoot;
}
/**
* Triggers a HTTP request using this builder's current configuration.
* @returns {Promise} a Promise that resolves to the server's response.
*/
call() {
this.checkFilter();
return this._sendNormalRequest(this.url).then(r => this._parseResponse(r));
}
//// TODO: Migrate to async, BUT that's a change in behavior and tests "rejects two filters" will fail.
//// It's because async will check within promise, which makes more sense when using awaits instead of Promises.
// public async call(): Promise<T> {
// this.checkFilter();
// const r = await this._sendNormalRequest(this.url);
// return this._parseResponse(r);
// }
//// /* actually equals */
//// public call(): Promise<T> {
//// return Promise.resolve().then(() => {
//// this.checkFilter();
//// return this._sendNormalRequest(this.url)
//// }).then((r) => {
//// this._parseResponse(r)
//// });
//// }
/**
* Creates an EventSource that listens for incoming messages from the server. To stop listening for new
* events call the function returned by this method.
* @see [Horizon Response Format](https://developers.stellar.org/api/introduction/response-format/)
* @see [MDN EventSource](https://developer.mozilla.org/en-US/docs/Web/API/EventSource)
* @param {object} [options] EventSource options.
* @param {function} [options.onmessage] Callback function to handle incoming messages.
* @param {function} [options.onerror] Callback function to handle errors.
* @param {number} [options.reconnectTimeout] Custom stream connection timeout in ms, default is 15 seconds.
* @returns {function} Close function. Run to close the connection and stop listening for new events.
*/
stream(options = {}) {
this.checkFilter();
this.url.setQuery("X-Client-Name", "js-stellar-sdk");
this.url.setQuery("X-Client-Version", _horizon_axios_client.version);
// EventSource object
let es;
// timeout is the id of the timeout to be triggered if there were no new messages
// in the last 15 seconds. The timeout is reset when a new message arrive.
// It prevents closing EventSource object in case of 504 errors as `readyState`
// property is not reliable.
let timeout;
const createTimeout = () => {
timeout = setTimeout(() => {
es?.close();
es = createEventSource();
}, options.reconnectTimeout || 15 * 1000);
};
let createEventSource = () => {
try {
es = new EventSource(this.url.toString());
} catch (err) {
if (options.onerror) {
options.onerror(err);
}
}
createTimeout();
if (!es) {
return es;
}
// when receiving the close message from Horizon we should close the
// connection and recreate the event source (basically retrying forever)
let closed = false;
const onClose = () => {
if (closed) {
return;
}
clearTimeout(timeout);
es.close();
createEventSource();
closed = true;
};
const onMessage = message => {
if (message.type === "close") {
onClose();
return;
}
const result = message.data ? this._parseRecord(JSON.parse(message.data)) : message;
if (result.paging_token) {
this.url.setQuery("cursor", result.paging_token);
}
clearTimeout(timeout);
createTimeout();
if (typeof options.onmessage !== "undefined") {
options.onmessage(result);
}
};
const onError = error => {
if (options.onerror) {
options.onerror(error);
}
};
if (es.addEventListener) {
es.addEventListener("message", onMessage.bind(this));
es.addEventListener("error", onError.bind(this));
es.addEventListener("close", onClose.bind(this));
} else {
es.onmessage = onMessage.bind(this);
es.onerror = onError.bind(this);
}
return es;
};
createEventSource();
return () => {
clearTimeout(timeout);
es?.close();
};
}
/**
* Sets `cursor` parameter for the current call. Returns the CallBuilder object on which this method has been called.
* @see [Paging](https://developers.stellar.org/api/introduction/pagination/)
* @param {string} cursor A cursor is a value that points to a specific location in a collection of resources.
* @returns {object} current CallBuilder instance
*/
cursor(cursor) {
this.url.setQuery("cursor", cursor);
return this;
}
/**
* Sets `limit` parameter for the current call. Returns the CallBuilder object on which this method has been called.
* @see [Paging](https://developers.stellar.org/api/introduction/pagination/)
* @param {number} number Number of records the server should return.
* @returns {object} current CallBuilder instance
*/
limit(recordsNumber) {
this.url.setQuery("limit", recordsNumber.toString());
return this;
}
/**
* Sets `order` parameter for the current call. Returns the CallBuilder object on which this method has been called.
* @param {"asc"|"desc"} direction Sort direction
* @returns {object} current CallBuilder instance
*/
order(direction) {
this.url.setQuery("order", direction);
return this;
}
/**
* Sets `join` parameter for the current call. The `join` parameter
* includes the requested resource in the response. Currently, the
* only valid value for the parameter is `transactions` and is only
* supported on the operations and payments endpoints. The response
* will include a `transaction` field for each operation in the
* response.
*
* @param {"transactions"} join Records to be included in the response.
* @returns {object} current CallBuilder instance.
*/
join(include) {
this.url.setQuery("join", include);
return this;
}
/**
* A helper method to craft queries to "neighbor" endpoints.
*
* For example, we have an `/effects` suffix endpoint on many different
* "root" endpoints, such as `/transactions/:id` and `/accounts/:id`. So,
* it's helpful to be able to conveniently create queries to the
* `/accounts/:id/effects` endpoint:
*
* this.forEndpoint("accounts", accountId)`.
*
* @param {string} endpoint neighbor endpoint in question, like /operations
* @param {string} param filter parameter, like an operation ID
*
* @returns {CallBuilder} this CallBuilder instance
*/
forEndpoint(endpoint, param) {
if (this.neighborRoot === "") {
throw new Error("Invalid usage: neighborRoot not set in constructor");
}
this.filter.push([endpoint, param, this.neighborRoot]);
return this;
}
/**
* @private
* @returns {void}
*/
checkFilter() {
if (this.filter.length >= 2) {
throw new _errors.BadRequestError("Too many filters specified", this.filter);
}
if (this.filter.length === 1) {
// append filters to original segments
const newSegment = this.originalSegments.concat(this.filter[0]);
this.url.segment(newSegment);
}
}
/**
* Convert a link object to a function that fetches that link.
* @private
* @param {object} link A link object
* @param {bool} link.href the URI of the link
* @param {bool} [link.templated] Whether the link is templated
* @returns {function} A function that requests the link
*/
_requestFnForLink(link) {
return async (opts = {}) => {
let uri;
if (link.templated) {
const template = (0, _URITemplate.default)(link.href);
uri = (0, _urijs.default)(template.expand(opts)); // TODO: fix upstream types.
} else {
uri = (0, _urijs.default)(link.href);
}
const r = await this._sendNormalRequest(uri);
return this._parseResponse(r);
};
}
/**
* Given the json response, find and convert each link into a function that
* calls that link.
* @private
* @param {object} json JSON response
* @returns {object} JSON response with string links replaced with functions
*/
_parseRecord(json) {
if (!json._links) {
return json;
}
for (const key of Object.keys(json._links)) {
const n = json._links[key];
let included = false;
// If the key with the link name already exists, create a copy
if (typeof json[key] !== "undefined") {
json[`${key}_attr`] = json[key];
included = true;
}
/*
If the resource can be side-loaded using `join` query-param then don't
try to load from the server. We need to whitelist the keys which are
joinable, since there are other keys like `ledger` which is included in
some payloads, but doesn't represent the ledger resource, in that
scenario we want to make the call to the server using the URL from links.
*/
if (included && JOINABLE.indexOf(key) >= 0) {
const record = this._parseRecord(json[key]);
// Maintain a promise based API so the behavior is the same whether you
// are loading from the server or in-memory (via join).
json[key] = async () => record;
} else {
json[key] = this._requestFnForLink(n);
}
}
return json;
}
async _sendNormalRequest(initialUrl) {
let url = initialUrl;
if (url.authority() === "") {
url = url.authority(this.url.authority());
}
if (url.protocol() === "") {
url = url.protocol(this.url.protocol());
}
return _horizon_axios_client.AxiosClient.get(url.toString()).then(response => response.data).catch(this._handleNetworkError);
}
/**
* @private
* @param {object} json Response object
* @returns {object} Extended response
*/
_parseResponse(json) {
if (json._embedded && json._embedded.records) {
return this._toCollectionPage(json);
}
return this._parseRecord(json);
}
/**
* @private
* @param {object} json Response object
* @returns {object} Extended response object
*/
_toCollectionPage(json) {
for (let i = 0; i < json._embedded.records.length; i += 1) {
json._embedded.records[i] = this._parseRecord(json._embedded.records[i]);
}
return {
records: json._embedded.records,
next: async () => {
const r = await this._sendNormalRequest((0, _urijs.default)(json._links.next.href));
return this._toCollectionPage(r);
},
prev: async () => {
const r = await this._sendNormalRequest((0, _urijs.default)(json._links.prev.href));
return this._toCollectionPage(r);
}
};
}
/**
* @private
* @param {object} error Network error object
* @returns {Promise<Error>} Promise that rejects with a human-readable error
*/
async _handleNetworkError(error) {
if (error.response && error.response.status && error.response.statusText) {
switch (error.response.status) {
case 404:
return Promise.reject(new _errors.NotFoundError(error.response.statusText, error.response.data));
default:
return Promise.reject(new _errors.NetworkError(error.response.statusText, error.response.data));
}
} else {
return Promise.reject(new Error(error.message));
}
}
}
exports.CallBuilder = CallBuilder;