jsonrpc.js

/**
 * author: zhixin wen <wenzhixin2010@gmail.com>
 */

function JSONRpc(url, methods) {

	var createFunc = function(method) {
		
		return function(callback, request) {
			var async = true,
				result = null,
				params = [], 
				newUrl = url;
			
			if (typeof callback !== 'function') {
				async = false;
				request = callback;
				callback = null;
			}
			if (request) {
				if (request.hasOwnProperty('params') && request.hasOwnProperty('appendUrl')) {
					params = request.params;
					newUrl += '/' + request.appendUrl;
				}
				else if (request.hasOwnProperty('params')) {
					params = request.params;
				}
				else if (request.hasOwnProperty('appendUrl')) {
					newUrl += '/' + request.appendUrl;
				}
				else {
					params = request;
				}
			}
			$.ajax({
				url: newUrl,
				type: 'POST',
				contentType: 'application/json-rpc',
				data: JSON.stringify({
					jsonrpc: '2.0',
					id: JSONRpc.requestID++,
					method: method,
					params: params
				}),
				async: async,
				success: function(data) {
					result = data.hasOwnProperty('result') ? data.result : null;
					var error = data.hasOwnProperty('error') ? data.error : null;
					if (callback) callback(result, error);
				},
				error: function(XMLHttpRequest, textStatus) {
					if (callback) callback(XMLHttpRequest.status);
				}
			});
			return result;
		};
	};
	
	for (var i = 0; i < methods.length; i++) {
		var method = methods[i],
			tmpArr = method.split('.'),
			funcArr = [];
		for (var j = 0; j < tmpArr.length; j++) {
			if (tmpArr[j] !== '') {
				funcArr.push(tmpArr[j]);
			}
		}
		if (funcArr.length === 1) {
			this[funcArr[0]] = createFunc(method);
		}
		else {
			if (!this.hasOwnProperty(funcArr[0])) {
				this[funcArr[0]] = {};
			}
			var methodObj = this[funcArr[0]];
			for (j = 1; j < funcArr.length - 1; j++) {
				if (!methodObj.hasOwnProperty(funcArr[j])) {
					methodObj[funcArr[j]] = {};
				}
				methodObj = methodObj[funcArr[j]];
			}
			methodObj[funcArr[funcArr.length - 1]] = createFunc(method);
		}
	}
}
JSONRpc.requestID = 1;