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Set message value length once #11

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51 changes: 30 additions & 21 deletions protocol.js
Original file line number Diff line number Diff line change
@@ -1,25 +1,10 @@

module.exports = (handleMessage) => {

process.stdin.on('readable', () => {
var input = []
var chunk
while (chunk = process.stdin.read()) {
input.push(chunk)
}
input = Buffer.concat(input)

var msgLen = input.readUInt32LE(0)
var dataLen = msgLen + 4

if (input.length >= dataLen) {
var content = input.slice(4, dataLen)
var json = JSON.parse(content.toString())
handleMessage(json)
}
})
var msgLen = 0,
dataLen = 0,
input = []

function sendMessage (msg) {
function sendMessage(msg) {
var buffer = Buffer.from(JSON.stringify(msg))

var header = Buffer.alloc(4)
Expand All @@ -29,10 +14,34 @@ module.exports = (handleMessage) => {
process.stdout.write(data)
}

process.stdin.on('readable', () => {
var chunk
while (chunk = process.stdin.read()) {
// Set message value length once
if (msgLen === 0 && dataLen === 0) {
msgLen = chunk.readUInt32LE(0)
chunk = chunk.subarray(4)
}
// Store accrued message length read
dataLen += chunk.length
input.push(chunk)
if (dataLen === msgLen) {
// Send accrued message from client back to client
handleMessage(JSON.parse(Buffer.concat(input).toString()))
// Reset dynamic variables after sending accrued read message to client
msgLen = 0,
dataLen = 0,
input = []
}
}
})

process.on('uncaughtException', (err) => {
sendMessage({error: err.toString()})
sendMessage({
error: err.toString()
})
})

return sendMessage

}