/***
* rpcjson() - promise to retrieve data from an RPC-JSON Server
*
* Designed specifically to work with rpcJSONserver.class.php. Expects a
* request in RPC-JSON format and returns
* the server response as a Javascript object to the function specified
* in the .then method, or returns an error response in the .catch
* method.
*
* @param text url The location of the server (typically index.php)
* @param text/int id the identity of the request. Either an
* integer or a string NOT starting with a
* number
* @param text method the name of the method to be invoked as
* filename.classname.methodname
* @param object params The parameters to be passed to the method
*
* @returns promise the .then call will receive the data
* returned by the method.
* the .catch call will receive an error
* object formatted according to the RPC-JSON
* v2.0 specification.
***/
function jsonrpcClient(url, id, method, parameters)
{
let key, request, p, k;
request = {"jsonrpc":"2.0", "id":id, "method":method, "params":parameters};
p = new Promise(function (resolve, reject){
//retrieve data from server based on a spec using json format
let xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4) {
if (this.status == 200) {
let response = JSON.parse(xhttp.responseText);
if (response.result != undefined) {
resolve(response)
} else {
reject(response);
}
} else {
let response = {};
response.id = null;
response.jsonrpc = "2.0";
response.error = {
"error":'XHTTP:'+ this.status + ":" + xhttp.responseText};
response.errorNum = '-31099';
reject(response);
}
}
};
xhttp.open("POST", url, true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send('data='+JSON.stringify(request));
});
return p;
}
|
Download
