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clojure-lpd's Introduction

clojure-lpd

A pure Clojure implementation of the server-side of the Line Printer Daemon protocol.

LPD is a simple network printing protocol described in RFC 1179.

The main purpose of this library is the creation of virtual network printers with a Clojure backend. This is useful to allow clients to print to a Clojure application where the data (usually Postscript or PDF) is handled further.

Usage

The basic protocol is implemented in the lpd.protocol namespace. For most use cases, lpd.server implements a basic server.

The following example starts a server on port 6331 which will accept all incoming print jobs and log them to standard out:

(require '[lpd.server :refer [make-server start-server]]
         '[lpd.protocol :as protocol])

;;; Create a 'handler' object. `accept-job' will be called for every
;;; received print job.
(def my-handler
  (reify
    protocol/IPrintJobHandler
    (accept-job [_ queue job]
      ;; `queue' is the name of the printer queue a client prints on
      (println "Got a job on" queue)
      ;; `job' is a PrintJob containing the job-data (a byte-array)
      ;; under the key :data and other information about the job
      (prn job))))

(def server (make-server {:host "localhost"
                          :port 6331
                          :handler my-handler}))

;;; Starts the server on a new thread. To stop the server, replace
;;; `start-server' with `stop-server'
(alter-var-root #'server start-server)

License

Copyright © 2015 bevuta IT GmbH

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.

clojure-lpd's People

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