more than one user can't run groovyserv in the same Unix env.

[berngp]

Given user userA and user userB
and both users are logged to the same Nix system (Ubuntu, *Fedora, Centos, RedHat)

When they try to run groovyclient -v at different times, then the call will fail for the second one with the following message.

 $ groovyclient -v
  ERROR: cannot open cookie file

or just fail silently.

Logs:
Server started with port: 1961
Unexpected error: GroovyServer
----> java.lang.NullPointerException: Cannot invoke method getAt() on null object
... (ClientProtocols.groovy:100)

[berngp]

We have two potential solutions we are working on...

1. Dynamic port resolution per User.
   1.1 Each user has its own port.

2. OS FIFOs( aka named pipes) per User per Server one per Client.

   1. Isolation is kept at the user context

   ~/.groovy/groovyserver/server.fifo

   ~/.groovy/groovyserver/clients.fifo.d

   ~/.groovy/groovyserver/scripts

   1. A user will only have one Server listening to its fifo (600)
   2. A client will setup a receiving fifo (600) and a script (600), send a message to the server giving the ref. of the client's fifo and the ref of the script.
   3. Server will receive the message through the fifo, read the script and execute such script sending the output to the client's fifo.

Notes

• The *Nix queue was dropped since its not supported in all environments unfortunately (windows that is)
• The term pipe was being used previously but changed to FIFO (aka. named pipe)

[uehaj]

Hi,Berngp
Thank you for idea.
About 2, you mean use named pipe of Unix instead of TCP domain socket port?
Is there are way to implement this in Windows, without cygwin? Or we have to
use Win32 API directly?

[berngp]

Hi Uehaj
Yes FIFOs (aka. named pipes). I am working on a *Nix version of this. I don't have a Windows machine but my understanding is that it supports it natively and through cygwin (Win32 SDK can open them in the same way as files).

[nobeans]

I'm considering an automatic mechanism of decision of available port number for each user.
it wasn't in time for v0.6 but I wish I could implement it at v0.7.

[berngp]

No worries, haven't worked with the FIFOs (btw JDK 1.7 supports binary sockets.. problem is.. not sure when 1.7 will arrive)

[edwardsd]

Is there currently a workaround to this issue that would allow groovyserv to be used by multiple users in a shared UNIX environment?

[nobeans]

You can specify the port number when invoking groovyserver and groovyclient. please use the different port number for each user.
http://kobo.github.com/groovyserv/userguide_en.html#port-number