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httprpc.js
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102 lines (85 loc) · 2.87 KB
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//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
/**
* Creates a new HTTP-RPC service proxy.
*
* @param timeout The request timeout.
*/
var WebServiceProxy = function(timeout) {
this.timeout = timeout;
}
/**
* Executes a service operation.
*
* @param method The HTTP verb associated with the request.
* @param path The path associated with the request.
* @param arguments The request arguments.
* @param resultHandler A callback that will be invoked upon completion of the request.
*
* @return An XMLHttpRequest object representing the invocation request.
*/
WebServiceProxy.prototype.invoke = function(method, path, arguments, resultHandler) {
// Construct query
var query = "";
for (name in arguments) {
var value = arguments[name];
var values;
if (value instanceof Array) {
values = value;
} else if (value instanceof Object) {
values = [];
for (key in value) {
values.push(encodeURIComponent(key) + ":" + encodeURIComponent(value[key]));
}
} else {
values = [value];
}
for (var i = 0; i < values.length; i++) {
var element = values[i];
if (element == null) {
continue;
}
if (query.length > 0) {
query += "&";
}
query += encodeURIComponent(name) + "=" + encodeURIComponent(element);
}
}
// Execute request
var request = new XMLHttpRequest();
request.timeout = this.timeout;
request.onreadystatechange = function() {
if (request.readyState == 4) {
var status = request.status;
if (Math.floor(status / 100) == 2) {
var responseText = request.responseText;
resultHandler((responseText.length > 0) ? JSON.parse(responseText) : null, null);
} else {
resultHandler(null, status);
}
}
}
if (method.toLowerCase() == "post") {
request.open(method, path, true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.send(query);
} else {
if (query.length > 0) {
path += "?" + query;
}
request.open(method, path, true);
request.send();
}
return request;
}