go-ethereum/httprpc.js

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(function () {
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var HttpRpcProvider = function (host) {
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this.handlers = [];
this.host = host;
};
function formatJsonRpcObject(object) {
return {
jsonrpc: '2.0',
method: object.call,
params: object.args,
id: object._id
}
};
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function formatJsonRpcMessage(message) {
var object = JSON.parse(message);
return {
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_id: object.id,
data: object.result
};
};
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HttpRpcProvider.prototype.sendRequest = function (payload, cb) {
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var data = formatJsonRpcObject(payload);
var request = new XMLHttpRequest();
request.open("POST", this.host, true);
request.send(JSON.stringify(data));
request.onreadystatechange = function () {
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if (request.readyState === 4 && cb) {
cb(request);
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}
}
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};
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HttpRpcProvider.prototype.send = function (payload) {
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var self = this;
this.sendRequest(payload, function (request) {
self.handlers.forEach(function (handler) {
handler.call(self, formatJsonRpcMessage(request.responseText));
});
});
};
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HttpRpcProvider.prototype.poll = function (payload, id) {
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var self = this;
this.sendRequest(payload, function (request) {
var parsed = JSON.parse(request.responseText);
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if (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result) {
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return;
}
self.handlers.forEach(function (handler) {
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handler.call(self, {_event: payload.call, _id: id, data: parsed.result});
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});
});
};
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Object.defineProperty(HttpRpcProvider.prototype, "onmessage", {
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set: function (handler) {
this.handlers.push(handler);
}
});
if (typeof(web3) !== "undefined" && web3.providers !== undefined) {
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web3.providers.HttpRpcProvider = HttpRpcProvider;
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}
})();
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