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const Through = require('through2')
const ObjectMultiplex = require('obj-multiplex')
const pump = require('pump')
module.exports = {
jsonParseStream: jsonParseStream,
jsonStringifyStream: jsonStringifyStream,
setupMultiplex: setupMultiplex,
}
/**
* Returns a stream transform that parses JSON strings passing through
* @return {stream.Transform}
*/
function jsonParseStream () {
return Through.obj(function (serialized, _, cb) {
this.push(JSON.parse(serialized))
cb()
})
}
/**
* Returns a stream transform that calls {@code JSON.stringify}
* on objects passing through
* @return {stream.Transform} the stream transform
*/
function jsonStringifyStream () {
return Through.obj(function (obj, _, cb) {
this.push(JSON.stringify(obj))
cb()
})
}
/**
* Sets up stream multiplexing for the given stream
* @param {any} connectionStream - the stream to mux
* @return {stream.Stream} the multiplexed stream
*/
function setupMultiplex (connectionStream) {
const mux = new ObjectMultiplex()
pump(
connectionStream,
mux,
connectionStream,
(err) => {
if (err) console.error(err)
}
)
return mux
}
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