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Built-in-nREPL-Service.md

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Configuring the nREPL service

The nREPL service is intended to be used as a debugging tool and not directly called by any other application code, so no useful functions are directly exported by this service. A shutdown function is provided solely to allow the shutdown service to cleanly stop the nREPL server.

The nrepl section in a Trapperkeeper configuration file specifies all the settings needed to start up an nREPL server attached to Trapperkeeper.

boostrap.cfg

By default, the nrepl service is not put into your application's bootstrap.cfg. If you want to use this service, add puppetlabs.trapperkeeper.services.nrepl.nrepl-service/nrepl-service to your bootstrap.cfg and enable it in your config.

enabled

The enabled flag is a boolean value, which can be set to either "true" or "false". When this is set to true, the nREPL server will start and accept connections. If this value is not specified then enabled=false is assumed.

host

The IP address to bind the nREPL server to. If not specified then 0.0.0.0 is used, which indicates binding to all available interfaces.

port

The port that the nREPL server is bound to. If no port is defined then the default value of 7888 is used.

middlewares

A list of nREPL middlewares to load; for example, for compatibility with LightTable or other editors.

Typical config.conf for nREPL

nrepl {
   port = 12345
   enabled = true
   middlewares = [lighttable.nrepl.handler/lighttable-ops]
}

The nREPL server

For more information on the nREPL server see the nREPL server README.