plugeth/http.js
Marek Kotewicz 66e439b6f4 http polling
2014-10-23 14:11:57 +02:00

70 lines
1.9 KiB
JavaScript

(function () {
var HttpProvider = function (host) {
this.handlers = [];
this.host = host;
};
function formatJsonRpcObject(object) {
return {
jsonrpc: '2.0',
method: object.call,
params: object.args,
id: object._id
}
};
function formatJsonRpcMessage(message) {
var object = JSON.parse(message);
return {
_id: object.id,
data: object.result
};
};
HttpProvider.prototype.sendRequest = function (payload, cb) {
var data = formatJsonRpcObject(payload);
var request = new XMLHttpRequest();
request.open("POST", this.host, true);
request.send(JSON.stringify(data));
request.onreadystatechange = function () {
if (request.readyState === 4 && cb) {
cb(request);
}
}
};
HttpProvider.prototype.send = function (payload) {
var self = this;
this.sendRequest(payload, function (request) {
self.handlers.forEach(function (handler) {
handler.call(self, formatJsonRpcMessage(request.responseText));
});
});
};
HttpProvider.prototype.poll = function (payload, id) {
var self = this;
this.sendRequest(payload, function (request) {
var parsed = JSON.parse(request.responseText);
if (!parsed.result) {
return;
}
self.handlers.forEach(function (handler) {
handler.call(self, {_event: "messages", data: id});
});
});
};
Object.defineProperty(HttpProvider.prototype, "onmessage", {
set: function (handler) {
this.handlers.push(handler);
}
});
if (typeof(web3) !== "undefined" && web3.providers !== undefined) {
web3.providers.HttpProvider = HttpProvider;
}
})();