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Added XMLHttpRequest fallback #2

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171 changes: 115 additions & 56 deletions same-as-usual.js
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Original file line number Diff line number Diff line change
@@ -1,57 +1,116 @@
function $http (baseUrl){

let headers = {}
function wrapperAjax ({url, method, data}){
const setup = {}
setup.method = method;
setup.headers = headers;
if(data){
setup.body = typeof(data) !== "string" ? JSON.stringify(data): data;
}
return fetch(`${baseUrl+ url}`, setup)
}

function fallbackStrategy (prom, cb) {
if(cb && typeof(cb) === "function") {
prom
.then(response => response.json())
.then(data => cb(false, data))
.catch(cb)
} else {
return prom.then(response => response.json())
}
}

return {
headers(obj){
const _self = this;
this.headers = obj;
return _self;
},
method(verb, url, data, cb){
return fallbackStrategy(wrapperAjax({
url, method:verb, data
}), cb)
},
get(url, cb){
return fallbackStrategy(wrapperAjax({
url, method:"GET"
}), cb)
},
post(url, data, cb){
return fallbackStrategy(wrapperAjax({
url, method:"POST", data
}), cb)
},
put(url, data, cb){
return fallbackStrategy(wrapperAjax({
url, method:"PUT", data
}), cb)
},
delete(url, cb){
return fallbackStrategy(wrapperAjax({
url, method:"DELETE"
}), cb)
}
}
function $http(baseUrl) {

let headers = {}
function wrapperAjax({ url, method, data }) {
const setup = {}
setup.method = method;
setup.headers = headers;
if (data) {
setup.body = typeof (data) !== "string" ? JSON.stringify(data) : data;
}
return ajaxFallback(`${baseUrl + url}`, setup);
}

function fallbackStrategy(prom, cb) {
if (cb && typeof (cb) === "function") {
debugger;
prom
.then(response => response.json())
.then(data => cb(false, data))
.catch(cb);
} else {
return prom.then(response => {
return response.json();
});
}
}

function XMLHttpRequestAsFetch(url, setup) {
return new Promise((resolve, reject) => {
let xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(ev) {

if (xhr.readyState == 4) {
if (xhr.status < 300) {
resolve({
json: ()=> promisifiedJson(xhr.responseText),
})
} else {
reject(ev.responseText)
}

}
}
xhr.open(setup.method, url, false);


for (let header in headers) {
xhr.setRequestHeader(header, headers[header])
}

if (setup.body) {
xhr.send(setup.body)
} else {
xhr.send();
}
})
}

function promisifiedJson(data) {
return new Promise((res, rej) => {
try {
let obj = JSON.parse(data)
res(obj)
} catch (error) {
rej(error)
}
})
}

function ajaxFallback(url, setup) {
if (fetch && typeof (fetch) === "function") {
return fetch(url, setup)
} else {
return XMLHttpRequestAsFetch(url, setup)
}

}

return {
headers(obj) {
const _self = this;
this.headers = obj;
return _self;
},
method(verb, url, data, cb) {
return fallbackStrategy(wrapperAjax({
url, method: verb, data
}), cb)
},
get(url, cb) {
return fallbackStrategy(wrapperAjax({
url, method: "GET"
}), cb)
},
post(url, data, cb) {
return fallbackStrategy(wrapperAjax({
url, method: "POST", data
}), cb)
},
put(url, data, cb) {
return fallbackStrategy(wrapperAjax({
url, method: "PUT", data
}), cb)
},
delete(url, cb) {
return fallbackStrategy(wrapperAjax({
url, method: "DELETE"
}), cb)
}
}
}

$http("http://airemad.com/api/v1/")
.get("station/S001")
.then(console.log)
.catch(console.warn)