[NREPL-13] nrepl should support binding to a specific interface instead of all Created: 29/Feb/12  Updated: 29/Mar/12  Resolved: 29/Mar/12

Status: Closed
Project: tools.nrepl
Component/s: None
Affects Version/s: None
Fix Version/s: 0.2.0

Type: Enhancement Priority: Major
Reporter: Toby Crawley Assignee: Chas Emerick
Resolution: Completed Votes: 0
Labels: None

Patch: Code


nrepl currently accepts a :port to bind to as an option, and uses that with the single-arg ServerSocket constructor, which binds to that port on all interfaces. I propose we add a :host option as well that can be used to specify the hostname or address of the interface to bind to.

Here is a potential implementation:

diff --git a/src/main/clojure/clojure/tools/nrepl/server.clj b/src/main/clojure/clojure/tools/nrepl/server.clj
index 9dbac40..b6f625b 100644
--- a/src/main/clojure/clojure/tools/nrepl/server.clj
+++ b/src/main/clojure/clojure/tools/nrepl/server.clj
@@ -8,7 +8,7 @@
   (:use [clojure.tools.nrepl.misc :only (returning response-for log)])
-  (:import (java.net Socket ServerSocket)))
+  (:import (java.net InetAddress Socket ServerSocket)))
 (defn unknown-op
   "Sends an :unknown-op :error for the given message."
@@ -64,7 +64,9 @@
 (defn start-server
   "Starts a socket-based nREPL server.  Configuration options include:
+   * :host — the address or hostname of the interface that should be used;
+       defaults to all interfaces
    * :port — defaults to 0, which autoselects an open port on localhost
    * :handler — the nREPL message handler to use for each incoming connection;
        defaults to the result of (default-handler)
@@ -77,8 +79,10 @@
    Returns a handle to the server that is started, which may be stopped
    either via `stop-server`, (.close server), or automatically via `with-open`."
-  [& {:keys [port transport-fn handler ack-port greeting-fn] :or {port 0}}]
-  (let [ss (ServerSocket. port)
+  [& {:keys [host port transport-fn handler ack-port greeting-fn] :or {port 0}}]
+  (let [ss  (if host
+              (ServerSocket. port 0 (InetAddress/getByName host))
+              (ServerSocket. port))
         smap {:ss ss
               :transport (or transport-fn t/bencode)
               :greeting greeting-fn

I'm putting a CA in the mail today.

Comment by Chas Emerick [ 29/Mar/12 12:53 PM ]

Fixed on master, released as part of 0.2.0-beta3.

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