how to connect to remote rabbitmq using clojure

Question

I am using langohr to connect rabbitmq, if I don't specify any connection string, it works well and it connects to local server, but I want to connect to remote server. So I have the following code. I am using connection string of amqp://bigdata:bigdata@s1:5672, s2 is the hostname of the remote server.

let [            a (println rabbitmq-url)
            rmq-conn  (rmq/connect {:uri rabbitmq-url})
            a (println rabbitmq-url)]

But it throws the error of the following

$ lein run
amqp://bigdata:bigdata@s1:5672
Exception in thread "main" java.io.IOException, compiling:(/tmp/form-init589039011205967992.clj:1:71)
    at clojure.lang.Compiler.load(Compiler.java:7142)
    at clojure.lang.Compiler.loadFile(Compiler.java:7086)
    at clojure.main$load_script.invoke(main.clj:274)
    at clojure.main$init_opt.invoke(main.clj:279)
    at clojure.main$initialize.invoke(main.clj:307)
    at clojure.main$null_opt.invoke(main.clj:342)
    at clojure.main$main.doInvoke(main.clj:420)
    at clojure.lang.RestFn.invoke(RestFn.java:421)
    at clojure.lang.Var.invoke(Var.java:383)
    at clojure.lang.AFn.applyToHelper(AFn.java:156)
    at clojure.lang.Var.applyTo(Var.java:700)
    at clojure.main.main(main.java:37)
Caused by: java.io.IOException
    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:106)
    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:102)
    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:124)
    at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:376)
    at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:36)
    at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:83)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:609)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:651)
    at com.novemberain.langohr.Connection.init(Connection.java:92)
    at langohr.core$connect.invoke(core.clj:93)
    at clojurewerkz.testcom.core$create_message_from_database.invoke(core.clj:33)
    at clojurewerkz.testcom.core$create_message_from_database_loop.invoke(core.clj:53)
    at clojurewerkz.testcom.core$_main.doInvoke(core.clj:60)
    at clojure.lang.RestFn.invoke(RestFn.java:397)
    at clojure.lang.Var.invoke(Var.java:375)
    at user$eval5.invoke(form-init589039011205967992.clj:1)
    at clojure.lang.Compiler.eval(Compiler.java:6703)
    at clojure.lang.Compiler.eval(Compiler.java:6693)
    at clojure.lang.Compiler.load(Compiler.java:7130)
    ... 11 more
Caused by: com.rabbitmq.client.ShutdownSignalException: connection error
    at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:67)
    at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:33)
    at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:343)
    at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:216)
    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:118)
    ... 27 more
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(SocketInputStream.java:189)
    at java.net.SocketInputStream.read(SocketInputStream.java:121)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
    at java.io.DataInputStream.readUnsignedByte(DataInputStream.java:288)
    at com.rabbitmq.client.impl.Frame.readFrom(Frame.java:95)
    at com.rabbitmq.client.impl.SocketFrameHandler.readFrame(SocketFrameHandler.java:139)
    at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:534)
    at java.lang.Thread.run(Thread.java:745)

score 0 · Answer 1 · answered Jan 29 '15 at 15:07

0

First, make sure that RabbitMQ is running on the remote server. Second, check if the user that is connecting to that instance has the permission to do so.

answered Jan 29 '15 at 15:07

Chiron

20,081
17
81
133

If use a wrong password, then it complains com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. So my password is correct – Daniel Wu Jan 31 '15 at 13:33

score 0 · Answer 2 · edited May 23 '17 at 12:06

0

The same issue as below: my account doesn't have access to virtual hosts. RabbitMQ new connection refused due to SocketException

edited May 23 '17 at 12:06

Community

1
1

answered Jan 31 '15 at 13:40

Daniel Wu

5,853
12
42
93

score 0 · Answer 3 · answered Feb 04 '15 at 22:08

try this code.

First, put these libs into your project.clj

 ;;rabbitmq client
 [com.novemberain/langohr "2.11.0"]
 ;;logging
 [org.clojure/tools.logging "0.2.4"]

Then, make necessary imports in your clj file:

(:require
;logging
[clojure.tools.logging :as log]

;;rabbitmq
[langohr.core :as rmq]
[langohr.channel :as lch]
[langohr.queue :as lq]
[langohr.exchange :as le]
[langohr.basic :as lb] ))

And here is connect function:

(defn get-mq-connect
"This function connects to RabbitMQ.
params example: {:host \"localhost\" :port 5672 :username \"guest\" :password \"guest\" :vhost \"/\"}
Returns: connect object - connection successful, nil - error occured."
[params]
(try
  (log/trace params)
  (rmq/connect params)
  (catch Exception e
    (log/error (.getMessage e))
    (println "MQ connection error:" (.getMessage e)))))

You can call this function that way:

(let [ params {:host "myhost.com" :port 5672 :username "admin" :password "StrongPassw098" :vhost "/"}
       conn (get-mq-connect mq-params)]
(when-not (nil? conn)
  (let [ch (lch/open conn)]
    (while (not @stop-flag?)
      (do
         ;;put here your code
         ))
    (rmq/close ch)
    (rmq/close conn)))))

how to connect to remote rabbitmq using clojure

3 Answers3