I'm trying to create an HTTP server that is essentially a clojure REPL
with some integration into some classes on the server's classpath.
I've got something working, but I noticed some things that made me
realize I don't quite understand the scope of namespaces/imports in
clojure when eval'ing. If anyone can shed some light on what's
happening and why, it would be great.
I'm using compojure to do my HTTP and the server right now looks like:
(ns my.namespace.hello-world
(:use compojure)
(:use clojure.contrib.duck-streams)
(:use clojure.contrib.json.write)
(:import java.io.InputStreamReader)
(:import java.io.PushbackReader)
(:import (org.joda.time Interval DateTime)))
(defroutes evallerificator
(POST "/1.0/cloj"
(eval (read (PushbackReader. (InputStreamReader. (request :body))))))
(GET "/"
(html [:h1 "Hello World"]))
(ANY "*" (page-not-found)))
(run-server {:port 43034}
"/*" (servlet evallerificator))
This works if I curl something like:
curl -v 'http://localhost:43034/1.0/cloj' -H 'content-type:
application/clojure' -d '(str (+ 1 2))'
But, if I want to, say, output something in JSON format I have to write
curl 'http://localhost:43034/1.0/cloj' -H 'content-type:
application/clojure' -d '(clojure.contrib.json.write/json-str {:howdy
["hi" 1 2 3]})'
{"howdy":["hi",1,2,3]}
If I do just
curl 'http://localhost:43034/1.0/cloj' -H 'content-type:
application/clojure' -d '(json-str {:howdy ["hi" 1 2 3]})'
I get this exception
java.lang.Exception: Unable to resolve symbol: json-str in this
context (NO_SOURCE_FILE:0)
Something like this
curl -v 'http://localhost:43034/1.0/cloj' -H 'content-type:
application/clojure' -d "(require 'clojure.contrib.json.write)
(json-str {:howdy [\"hi\" 1 2 3]})"
Doesn't work because I'm only read/eval'ing one thing.
My goal is to be able to use things on the classpath from the clojure
code that I pass in. It would be nice if I had control of what
someone could require/use, but at this point I'm willing to settle for
access to anything and everything on the classpath.
Any help is appreciated.
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