Docker Support added

This is now the version compatible to IRIS using IRIS Native API for Node.js
which is significantly different from the interface availaible for Caché.

Node / JavaScript have wide reputation to work as WebSocket client.
By using the IRIS adapter it becomes easy to control and to consume the results as a
Client for WebSocket Servers and to collect the replies in IRIS.

I used node-v10.15.1-x64.msi and intersystems-iris-native package

How it works

You provide a Global for input in namespace USER (default)

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

The server is controlled by ^ZSocketRun from IRIS

set ^ZSocketRun(0)="wss://ws.postman-echo.com/raw" ;echo server
set ^ZSocketRun=1 ; => send to echo server
; -1 => stop server and exit
; 0 => wait for action

and from echo server you get back a Global as output
written by Node.js using the Native API for Node.js

zwrite ^ZSocketOut   
^ZSocketOut="wss://ws.postman-echo.com/"    
^ZSocketOut(0)=6   
^ZSocketOut(1)="Hello"   
^ZSocketOut(2)="World !"    
^ZSocketOut(3)="Robert"     
^ZSocketOut(4)="is waiting"     
^ZSocketOut(5)="for replies"     
^ZSocketOut(6)="exit"    

Or run

USER>do ^ZSocket

Local installation and operation

The WebSocket Service is started from OS command line.
You can follow the progress in console output

C:\Program Files\nodejs\cache>node WebSocketIRIS.js <server-ip>:<superserver-port>     

Comment in DC

Docker support

Prerequisites

Make sure you have git and Docker desktop installed.

Installation

Clone/git pull the repo into any local directory

  git clone https://github.com/rcemper/WebSocketIRIS.js.git   

Open the terminal in this directory, build and run the container:

 docker-compose up -d   

Next open a IRIS session in namespace USER and prepare the Globals for testing
a test program ZSocket.MAC is in subdirectory src of download directory

Now activate your Node.js client
Have the external IP address and the SuperServerPort ready !
default: localhost:1972 is just a placeholder

docker-compose exec wsock nodejs WebSocketIRIS.js <ip-adr>:<port>  

From IRIS terminal run

USER>do ^ZSocket
 
*** Welcome to WebSocket Micoservice demo ***
Known Hosts (*=Exit) [1]:
1  wss://ws.postman-echo.com/raw
2  --- server 2 ----
3  --- server 3 ----
select (1): 1 ==> wss://ws.postman-echo.com/raw
#
Enter text to get echoed from WebSocketClient Service
Terminate with * at first position
or get generated text by %
or append new text with @