forked from ztellman/lamina
/
connections.clj
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/
connections.clj
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;; Copyright (c) Zachary Tellman. All rights reserved.
;; The use and distribution terms for this software are covered by the
;; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this distribution.
;; By using this software in any fashion, you are agreeing to be bound by
;; the terms of this license.
;; You must not remove this notice, or any other, from this software.
(ns lamina.test.connections
(:use
[clojure test walk]
[lamina core connections trace]
[lamina.core.pipeline :only (success-result error-result)])
(:require
[clojure.contrib.logging :as log])
(:import java.util.concurrent.TimeoutException))
;;;
(def probes
{:connection:lost log-info
:connection:opened log-info
:connection:failed log-info})
(defn simple-echo-server []
(let [[a b] (channel-pair)]
(run-pipeline
(receive-in-order b #(enqueue b %))
(fn [_] (do (close a) (close b))))
[a #(do (close a) (close b))]))
(defn alternating-delay-echo-server []
(let [[a b] (channel-pair)]
(run-pipeline b
:error-handler (fn [_] (close a) (close b))
read-channel
(wait-stage 100)
#(when-not (drained? b)
(enqueue b %))
(constantly b)
read-channel
#(when-not (drained? b)
(enqueue b %))
(fn [_] (restart)))
[a #(do (close a) (close b))]))
(defn error-server []
(let [[a b] (channel-pair)]
(run-pipeline
(receive-in-order b (fn [_] (enqueue b (RuntimeException. "fail!"))))
(fn [_] (do (close a) (close b))))
[a #(do (close a) (close b))]))
(defmacro with-server [server-fn & body]
`(let [chs# (ref nil)
close-fns# (ref nil)
server# (ref true)
~'connect (fn []
(dosync
(if-not (ensure server#)
(error-result nil)
(let [[ch# close-fn#] (~server-fn)]
(alter chs# conj ch#)
(alter close-fns# conj close-fn#)
(success-result ch#)))))
~'start-server (fn []
(dosync (ref-set server# true)))
~'stop-server (fn []
(doseq [f# (dosync
(ref-set server# false)
(let [fns# (ensure close-fns#)]
(ref-set close-fns# nil)
(ref-set chs# nil)
fns#))]
(f#)))]
~@body))
;;;
(deftest test-persistent-connection
(with-server simple-echo-server
(let [connection (persistent-connection #(connect) {:description "test-connection"})]
(try
(Thread/sleep 100)
(stop-server)
(start-server)
(is (channel? (wait-for-result (connection) 1000)))
(stop-server)
(Thread/sleep 1000)
(start-server)
(is (channel? (wait-for-result (connection) 1000)))
(finally
(close-connection connection))))))
(defn simple-response
([client-fn timeout]
(with-server simple-echo-server
(let [f (client-fn #(connect) {:description "simple-response"})]
(try
(dotimes [i 10]
(is (= i (wait-for-result (f i timeout) 1000))))
(finally
(close-connection f))))))
([client-fn]
(simple-response client-fn -1)))
(deftest test-simple-response
(simple-response client)
(simple-response pipelined-client)
(simple-response (fn [& args] (client-pool 1 #(apply client args)))))
(deftest timeouts-can-be-used
(simple-response client 1000)
(simple-response pipelined-client 1000)
(simple-response (fn [& args] (client-pool 1 #(apply client args)))))
(defn dropped-connection [client-fn]
(with-server simple-echo-server
(let [f (client-fn #(connect) {:description "dropped-connection"})]
(try
(stop-server)
(let [results (doall (map #(f %) (range 10)))]
(Thread/sleep 100)
(start-server)
(Thread/sleep 1000)
(is (= (range 10) (map #(wait-for-result % 10000) results))))
(finally
(close-connection f))))))
(deftest test-dropped-connection
(dropped-connection client)
(dropped-connection pipelined-client)
(dropped-connection (fn [& args] (client-pool 1 #(apply client args)))))
(defn works-after-a-timed-out-request [client-fn initially-disconnected]
(with-server alternating-delay-echo-server
(when initially-disconnected
(stop-server))
(let [f (client-fn #(connect) {:probes (comment probes) :description "dropped-and-restored"})]
(when-not initially-disconnected
(stop-server))
(try
(is (thrown? TimeoutException @(f "echo" 10)))
(start-server)
(is (thrown? TimeoutException @(f "echo2" 10)))
(is (= "echo3" @(f "echo3" 10000)))
(finally
(close-connection f))))))
(defn persistent-connection-stress-test [client-fn]
(with-server simple-echo-server
(let [continue (atom true)
f (client-fn #(connect) {:probes (comment probes) :description "stress-test"})]
; periodically drop
(.start
(Thread.
#(loop []
(Thread/sleep 4000)
(stop-server)
;;(println "Disconnecting")
(Thread/sleep 100)
(start-server)
;;(println "Reconnecting")
(when @continue
(recur)))))
(try
(let [s (range 1e4)]
(is (= s
(->> s
(map (fn [x]
(run-pipeline
(f x 1e5)
:error-handler (fn [_])
#(do
#_(when (zero? (rem % 100))
(println %))
%))))
doall
(map deref)
))))
(finally
(reset! continue false)
(close-connection f))))))
(deftest test-keeps-on-working-after-a-timed-out-request
(testing "with the connection initially disconnected"
(works-after-a-timed-out-request pipelined-client true)
(works-after-a-timed-out-request client true))
(testing "with the connection disconnected afterwards"
(works-after-a-timed-out-request pipelined-client false)
(works-after-a-timed-out-request client false)
))
(deftest test-keeps-working-despite-constant-disconnects
(persistent-connection-stress-test client)
(persistent-connection-stress-test pipelined-client))
(defn errors-propagate [client-fn]
(with-server error-server
(start-server)
(let [f (client-fn #(connect) {:description "error-server"})]
(is (thrown? RuntimeException @(f "fail?" 100)))
(is (thrown? RuntimeException @(f "fail?" 100))))))
(deftest test-error-propagation
(errors-propagate client)
(errors-propagate pipelined-client)
(errors-propagate (fn [& args] (client-pool 1 #(apply client args)))))
;;;;
(def exception (Exception. "boom"))
(defmacro with-handler [handler options & body]
`(do
(let [[a# b#] (channel-pair)
~'ch a#
server# (server b# ~handler ~options)]
~@body)
(let [[a# b#] (channel-pair)
~'ch a#
server# (pipelined-server b# ~handler ~options)]
~@body)))
(deftest test-server-error-handler
(with-handler (fn [_ _] (throw exception)) nil
(enqueue ch 1 2)
(is (= [exception exception] (channel-seq ch))))
(with-handler (fn [_ _] (run-pipeline nil :error-handler (fn [_]) (fn [_] (throw exception)))) nil
(enqueue ch 1 2)
(is (= [exception exception] (channel-seq ch))))
(with-handler (fn [_ _] (throw exception)) {:include-request true}
(enqueue ch 1 2)
(is (= [{:request 1, :response exception} {:request 2, :response exception}] (channel-seq ch))))
(with-handler (fn [_ _] (run-pipeline nil :error-handler (fn [_]) (fn [_] (throw exception)))) {:include-request true}
(enqueue ch 1 2)
(is (= [{:request 1, :response exception} {:request 2, :response exception}] (channel-seq ch)))))
(deftest test-server-handler
(with-handler (fn [ch req] (enqueue ch req)) nil
(enqueue ch 1 2)
(is (= [1 2] (channel-seq ch))))
(with-handler (fn [ch req] (enqueue ch req)) {:include-request true}
(enqueue ch 1 2)
(is (= [{:request 1, :response 1} {:request 2, :response 2}] (channel-seq ch)))))
(deftest test-server-probes
(let [calls (channel)
results (channel)
errors (channel)]
(with-handler (fn [ch req] (enqueue ch req)) {:probes {:calls calls, :results results}}
(enqueue ch 1 2)
(let [calls (channel-seq calls)
results (channel-seq results)]
(is (= [[1] [2]] calls))
(is (= [[1] [2]] (map :args results)))))
(with-handler (fn [ch req] (throw exception)) {:probes {:calls calls, :errors errors}}
(enqueue ch 1 2)
(let [calls (channel-seq calls)
errors (channel-seq errors)]
(is (= [[1] [2]] calls))
(is (= [[1] [2]] (map :args errors)))))))
;;;