WebSocketClient.js


Follow
0
Star
2
Details
Version history
Issues
This application is not supported by InterSystems Corporation. Use it at your own risk.

What's new in this version

add image

WebSocket Client in Node.js
 This is a coding example working on Cache 2018.1.3  
 It will not be kept in sync with new versions      
 It is also NOT serviced by InterSystems Support !   

It will demonstrate the wide range that is openend by making use
of the power embedded in Node.js and its adapter to Caché.
Node / JavaScript have wide reputation to work as a WebSocket client.
By using the Caché adapter it becomes easy to control it and to consume the results as a
Client for WebSocket Servers and to collect the replies in Caché, Ensemble, ..

I used node-v6.16.0-x64.msi and cache610.node as cache.node

You provide a Global for input:

 ^WsockIn="wss://echo.websocket.org/"
 ^WsockIn(0)=6
 ^WsockIn(1)="Hello"
 ^WsockIn(2)="World !"
 ^WsockIn(3)="Robert"
 ^WsockIn(4)="is waiting"
 ^WsockIn(5)="for replies"
 ^WsockIn(6)="exit"

and with this echo server you get back a Global as output

 ^WsockOut(0)=6
 ^WsockOut(1)="Hello"
 ^WsockOut(2)="World !"
 ^WsockOut(3)="Robert"
 ^WsockOut(4)="is waiting"
 ^WsockOut(5)="for replies"
 ^WsockOut(6)="exit"

you may call it from with class code or routine or command line

  kill ^WsockOut
  do $zf(-1,"node ""C:\Program Files\nodejs\samples\WsockDemo""")
  zwrite ^WsockOut

or in verbose mode

  SAMPLES>$node "C:\Program Files\nodejs\samples\WsockDemo"

  start
  server:  wss://echo.websocket.org/
  Lines to process:  6

  WebSocket Client Connected
  client ready

  Line:  1  text:  Hello
  Line:  2  text:  World !
  Line:  3  text:  Robert
  Line:  4  text:  is waiting
  Line:  5  text:  for replies
  Line:  6  text:  exit
  lines sent:  6

  Received: 'Hello'
  Received: 'World !'
  Received: 'Robert'
  Received: 'is waiting'
  Received: 'for replies'
  Received: 'exit'
  replies received:  6

  Client Closed
  SAMPLES>

Using the WebSocket Server in namespace SAMPLES

ws://localhost:57772/csp/samples/Web.SocketTest.cls

the replies look like this:

Received: 'Welcome to Cache WebSocket. NameSpace: SAMPLES'
Received: ''Hello' (length=5) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=SAMPLES'
Received: ''World !' (length=7) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=SAMPLES'
Received: ''Robert' (length=6) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=SAMPLES'
Received: ''is waiting' (length=10) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=SAMPLES'
Received: ''for replies' (length=11) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=SAMPLES'
replies received:  6

Client Closed

.
. .
I have to admit this was my first piece of code to run in Node.js.

Category
Technology Example
Works with
CachéEnsemble
Tags
Info
Version
1.0.1
Last updated
2020-07-25
Repository
Open
Documentation
Open
License
Link