Create a shell within an app

I have a client application - often i am needing to explore/inspect the
classes that I get from the server. Loading the client each time with a
logger.debug statement is cumbersome and takes time due to server
connections and getting data.

I'd like to be able to expose the insides of the client to a shell
(could be inside the client) or could connect to the client. It's an
ncurses app, I can always prompt the user on clicking some key.

However, my query is: how does one expose the environment to this shell.
On the prompt given, I should be able to query objects just as in irb.
e.g

x.class
x.public_methods
x.name

Alternatively, is there already some existing gem which allows me to
expose the internals to a port, so another irb-like client can connect
and query the state ?
thx, rkumar

···

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Posted via http://www.ruby-forum.com/.

I have a client application - often i am needing to explore/inspect the
classes that I get from the server. Loading the client each time with a
logger.debug statement is cumbersome and takes time due to server
connections and getting data.

I'd like to be able to expose the insides of the client to a shell
(could be inside the client) or could connect to the client. It's an
ncurses app, I can always prompt the user on clicking some key.

However, my query is: how does one expose the environment to this shell.
On the prompt given, I should be able to query objects just as in irb.
e.g

x.class
x.public_methods
x.name

IIRC you can embed IRC pretty easily. The issue then might be how you limit access to areas of your application that should stay unchanged.

Alternatively, is there already some existing gem which allows me to
expose the internals to a port, so another irb-like client can connect
and query the state ?

You might just listen on some port with TCPServer and implement a rudimentary command line interface which then can be connected to via telnet. That shouldn't be too hard. Depends on your requirements for security though.

Kind regards

  robert

···

On 01.11.2010 07:19, Rahul Kumar wrote:

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

live_console has made it very easy for me to plug in a shell (using irb
on another terminal window) into an existing command-line application.

I hope someone will get it functioning with 1.9.x and maintain it.
thanks.
rkumar

···

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check out hijack


<http://github.com/ileitch/hijack>

···

On Mon, Nov 1, 2010 at 3:35 PM, Robert Klemme <shortcutter@googlemail.com>wrote:

On 01.11.2010 07:19, Rahul Kumar wrote:

I have a client application - often i am needing to explore/inspect the
classes that I get from the server. Loading the client each time with a
logger.debug statement is cumbersome and takes time due to server
connections and getting data.

I'd like to be able to expose the insides of the client to a shell
(could be inside the client) or could connect to the client. It's an
ncurses app, I can always prompt the user on clicking some key.

However, my query is: how does one expose the environment to this shell.
On the prompt given, I should be able to query objects just as in irb.
e.g

x.class

x.public_methods
x.name

IIRC you can embed IRC pretty easily. The issue then might be how you
limit access to areas of your application that should stay unchanged.

Alternatively, is there already some existing gem which allows me to

expose the internals to a port, so another irb-like client can connect
and query the state ?

You might just listen on some port with TCPServer and implement a
rudimentary command line interface which then can be connected to via
telnet. That shouldn't be too hard. Depends on your requirements for
security though.

Kind regards

       robert

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

Piyush Ranjan wrote in post #958454:

check out hijack

http://github.com/ileitch/hijack
<http://github.com/ileitch/hijack>

I did come across both hijack and live-console.
Unfortunately, hijack hangs in 1.9 and my app runs under 1.8 and 1.9.
(The person concerned said in April he would look into 1.9 but seems
nothing has happened since.)

live-console also borks in 1.9. giving an irb encoding error, however, i
commented off a line and now the samples work. So live-console may be
the way to go for now.

Robert, since this is for testing only, and i would disable it
otherwise, so its not an issue.

It would be nice if someone would take up hijack and live-console
seriously and not let it become abandonware. thanks, rkumar.

···

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