Node.js and MetaTrader 4 communication bridge with ZeroMQ.
npm install mt4-zmq-bridgeNode.js and MetaTrader 4 communication bridge with ZeroMQ.
This module depends on this MetaTrader 4 Expert Advisor. Please introduce with it thoroughly before using this module.
``
npm install --save mt4-zmq-bridge
`js`
const mt4zmqBridge = require('mt4-zmq-bridge');
mt4zmqBridge objects contain multiple enum properties and connect function.
Please refer to mentioned MetaTrader 4 Expert Advisor for enum types.
A function accepting two arguments: reqUrl
URL to REQ server pullUrl
URL to PULL server
###### Example
`js`
const zmqBridge = mt4zmqBridge.connect('tcp://127.0.0.1:5555', 'tcp://127.0.0.1:5556');
It returns connection bridge object.
#### zmqBridge.request
A function used to send requests to MetaTrader 4 Expert Advisor).
It accepts any number of arguments. Request messages will be queued and have a timeout of 15 seconds by default. Timeout value can be set with zmqBridge.setRequestTimeoutValue.
The first argument is always request type. The rest of the arguments must match with used request type (check API).
A response can be returned either by a Callback or a Promise. To use Callback response, please provide a function as the last argument. Otherwise, a Promise will be returned.
Successfully returned response is an array (e.g. [ '110.522000', '110.542000', 'USDJPY' ]). Error response will return error object (e.g. Error('Invalid price.')).
###### Examples
Callback type "USDJPY" rates request:
`js`
zmqBridge.request(mt4zmqBridge.REQUEST_RATES, 'USDJPY', (err, res) => {
console.log(res); // [ '110.522000', '110.542000', 'USDJPY' ]
console.log(res[0]); // '110.522000' - market bid
console.log(res[1]); // '110.542000' - market ask
});
Promise type "USDJPY" rates request:
`js`
zmqBridge.request(mt4zmqBridge.REQUEST_RATES, 'USDJPY')
.then(res => {
console.log(res); // [ '110.522000', '110.542000', 'USDJPY' ]
})
.catch(err => {})
Buy limit order for 'USDJPY'.
`
zmqBridge.request(
mt4zmqBridge.REQUEST_TRADE_OPEN, // request type
'USDJPY', // market symbol
mt4zmqBridge.OP_BUYLIMIT, // order type
1.2, // volume
105.23, // price
0, // slippage
100.10, // stop loss
110.76, // take profit
'evening trade', // comment
0, // magic number
mt4zmqBridge.UNIT_CONTRACTS // unit type
, (err, res) => {
console.log(res); // [ '140734412' ]
});
Cancel pending order.
`
zmqBridge.request(mt4zmqBridge.REQUEST_TRADE_DELETE, 140734412).then(res => {
console.log(res); // [ '140734412' ]
});
More examples can be found in index.spec.js.
#### zmqBridge.onReqMessage
A function handling messages from REQ server. It is an empty function by default.
#### zmqBridge.onPullMessage
A function handling messages from PULL server. It is an empty function by default.
#### zmqBridge.isWaitingForResponse
A bool telling us whether a request with a specific id is still waiting for the response.
#### zmqBridge.reqConnected
A bool telling us whether a connection with REQ server is open or not.
#### zmqBridge.pullConnected
A bool telling us whether a connection with PULL server is open or not.
#### zmqBridge.reqSocket
An object containing ZeroMQ REQ connection object. Used mostly internally.
#### zmqBridge.pullSocket
An object containing ZeroMQ PULL connection object. Used mostly internally.
#### zmqBridge.setRequestTimeoutValue
function allowing to set a request timeout in miliseconds. The default request timeout is 15 seconds.
`
zmqBridge.setRequestTimeoutValue(30000);
IMPORTANT: Some tests will open real market orders. Work with tests only on demo accounts!
`
npm run test