198 lines
4.4 KiB
JavaScript
198 lines
4.4 KiB
JavaScript
import {ClientDriver} from './client-driver.js'
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export class XHRClientDriver extends ClientDriver{
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/* (1) Creates a client driver
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*
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* @_resource<String> Target resource (typically an URL)
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*
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---------------------------------------------------------*/
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constructor(_resource){
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/* (0) Parent check */
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if( !super().error )
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return;
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/* (1) Set inherited attributes */
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this.resource = _resource;
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/* (2) Create useful attributes */
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this.xhr = null;
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/* (N) Set all is ok */
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this.error = false;
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}
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/* (2) Binds the client to the resource
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*
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* @return bound<boolean> Whether the binding has been successful
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*
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---------------------------------------------------------*/
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bind(){
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/* (0) Parent check */
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if( !super.bind() )
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return false;
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/* (1) Create XHR instance */
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this.xhr = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHttpRequest');
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/* (2) Manage after request callbacks */
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this.xhr.onreadystatechange = function(){
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switch(this.xhr.readyState){
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// Request sent
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case 4:
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// Got response
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if( this.xhr.status === 200 ){
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this.callback.onreceive(this.xhr.responseText);
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this.state = ClientDriver.STATE.CLOSED;
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this.callback.onclose();
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// Request error
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}else{
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this.state = ClientDriver.STATE.CLOSED;
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this.callback.onclose();
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}
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break;
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}
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}.bind(this);
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/* (3) State is now CONNECTED (wrong but ..) */
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this.state = ClientDriver.STATE.CONNECTED;
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/* (4) Bind to callback onready() */
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this.callback.onready();
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/* (5) Return success */
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return true;
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}
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/* (3) Send request
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*
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* @_request<Object> Request data
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*
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* @return sent<boolean> Whether the request has been successful
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*
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---------------------------------------------------------*/
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send(_request){
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/* (1) Fast argument check
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---------------------------------------------------------*/
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/* (1) Parent check */
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if( !super.send(_request) )
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return false;
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/* (2) Error: invalid _request.path */
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if( typeof _request.path !== 'string' )
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return false;
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/* (2) Manage _request.path argument
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---------------------------------------------------------*/
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/* (1) Error: invalid path format */
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if( !/^([A-Z]+) (.+)/i.test(_request.path) )
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return;
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/* (2) Extract path data */
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let http_method = RegExp.$1;
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let http_uri = RegExp.$2;
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/* (3) Manage _request.form argument
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---------------------------------------------------------*/
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/* (1) Helpers */
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let is_object = typeof _request.form === 'object';
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let is_formdata = is_object && _request.form instanceof FormData;
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/* (2) Create default value for _request.form */
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let form_data = new FormData();
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/* (3) If already FormData object -> store as it is */
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if( is_object && is_formdata )
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form_data = _requset.form;
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/* (4) If just a raw object -> convert to FormData */
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if( is_object && !is_formdata )
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Object.keys(_request.form).map( (k, v) => form_data.append(k, v) );
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/* (4) Open connection
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---------------------------------------------------------*/
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/* (1) Build full URL */
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let request_url = this.resource.split(/\/$/).concat(http_uri.split(/^\//)).filter((v) => v.trim().length).join('/');
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/* (2) Open connection */
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this.xhr.open(http_method, request_url, true);
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/* (3) Send request */
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this.xhr.send(form_data);
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return true;
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}
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/* (4) Bind event to connection opened
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*
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* @_callback<Function> Callback launched when connection is opened
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*
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* @return bound<boolean> Whether the callback has successfully been bound
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*
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---------------------------------------------------------*/
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onready(_callback){
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/* (0) Parent check */
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if( !super.onready(_callback) )
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return false;
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}
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/* (5) Bind event to connection closed
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*
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* @_callback<Function> Callback launched when connection is closed
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*
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* @return bound<boolean> Whether the callback has successfully been bound
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*
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---------------------------------------------------------*/
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onclose(_callback){
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/* (0) Parent check */
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if( !super.onclose(_callback) )
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return false;
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}
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/* (6) Bind event to message reception
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*
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* @_callback<Function> Callback launched when a message is received
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*
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* @return bound<boolean> Whether the callback has successfully been bound
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*
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---------------------------------------------------------*/
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onreceive(_callback){
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/* (0) Parent check */
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if( !super.onreceive(_callback) )
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return false;
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}
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} |