index.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class HttpError extends Error {
constructor(status, message) {
super(message);
this.status = status;
}
}
exports.HttpError = HttpError;
class HttpClient {
constructor(baseUrl, maxConcurrency = 0) {
this.serverBaseUrl = "";
this.authorization = null;
this.maxConcurrency = 0;
this.currentRequestNum = 0;
this.pendingRequests = [];
this.serverBaseUrl = baseUrl;
this.maxConcurrency = maxConcurrency;
}
setAuthorization(authorization) {
this.authorization = authorization;
}
setResponsePreprocessor(func) {
this.responsePreprocessor = func;
}
get(path = "", timeout = 5000, headers) {
return this._handleRequest({
path,
method: "GET",
timeout,
headers
});
}
post(path = "", timeout = 5000, body, contentType, headers) {
return this._handleRequest({
path,
method: "POST",
timeout,
contentType,
headers
}, body);
}
put(path = "", timeout = 5000, body, contentType, headers) {
return this._handleRequest({
path,
method: "POST",
timeout,
contentType,
headers
}, body);
}
delete(path = "", timeout = 5000, headers) {
return this._handleRequest({
path,
method: "GET",
timeout,
headers
});
}
_handleRequest(request, body) {
let promise = new Promise((resolve, reject) => {
request.onSuccess = resolve;
request.onError = reject;
if (this.maxConcurrency > 0 && this.currentRequestNum >= this.maxConcurrency) {
this.pendingRequests.push(request);
}
else {
this._doRequest(request, body);
}
});
request.promise = promise;
if (request.abort) {
promise.abort = request.abort;
}
else {
promise.abort = () => {
let idx = this.pendingRequests.indexOf(request);
if (idx >= 0) {
this.pendingRequests.splice(idx, 1);
}
};
}
return promise;
}
_doRequest(request, body) {
this.currentRequestNum++;
const xhr = new XMLHttpRequest();
xhr.timeout = request.timeout;
xhr.open(request.method, this.serverBaseUrl + request.path, true);
if (request.contentType) {
xhr.setRequestHeader("Content-Type", request.contentType);
}
if (request.headers) {
for (let key in request.headers) {
xhr.setRequestHeader(key, request.headers[key]);
}
}
let abort = () => {
xhr.abort();
};
;
if (request.promise) {
request.promise.abort = abort;
}
else {
request.abort = abort;
}
xhr.onreadystatechange = () => {
if (xhr.readyState == 4) {
if (!request.onError)
return;
if (xhr.status == 200) {
let response = xhr.responseText ? xhr.responseText : xhr.response;
if (response && this.responsePreprocessor) {
response = this.responsePreprocessor(response);
}
request.onSuccess(response);
}
else {
request.onError(new HttpError(xhr.status, getHttpStatusError(xhr.status)));
}
if (this.pendingRequests.length) {
this._doRequest(this.pendingRequests.shift());
}
else {
this.currentRequestNum--;
}
}
};
xhr.ontimeout = () => {
if (request.onError) {
request.onError(new HttpError(408, getHttpStatusError(408)));
request.onError = null;
request.onSuccess = null;
if (this.pendingRequests.length) {
this._doRequest(this.pendingRequests.shift());
}
else {
this.currentRequestNum--;
}
}
};
xhr.onabort = () => {
if (request.onError) {
request.onError(new HttpError(-1, "Request abort."));
request.onError = null;
request.onSuccess = null;
if (this.pendingRequests.length) {
this._doRequest(this.pendingRequests.shift());
}
else {
this.currentRequestNum--;
}
}
};
if (this.authorization) {
xhr.setRequestHeader("auth-token", this.authorization);
}
xhr.send(body);
}
}
exports.HttpClient = HttpClient;
function getHttpStatusError(status) {
switch (status) {
case 400: return "Bad request.";
case 401: return "Unauthorized.";
case 402: return "Payment required.";
case 403: return "Forbidden.";
case 404: return "Not found.";
case 405: return "Method not allowed.";
case 406: return "Not acceptable.";
case 407: return "Proxy authentication required.";
case 408: return "Request timeout.";
case 409: return "Conflict.";
case 410: return "Gone.";
case 411: return "Length required.";
case 412: return "Precondition failed.";
case 413: return "Payload too large.";
case 414: return "URI too long.";
case 416: return "Requested range not satisfiable.";
case 417: return "Expectation failed.";
case 427: return "Precondition required.";
case 429: return "Too many requests.";
case 449: return "Retry after doing the appropriate action.";
case 500: return "Internal server error.";
case 501: return "Server does not support the functionality required to fulfill the request.";
case 502: return "Error response received from gateway.";
case 503: return "Temporarily overloaded.";
case 504: return "Timed out waiting for gateway.";
case 505: return "HTTP version not supported.";
}
return "Unknown error code: " + status;
}