Fatal error and exception on IOError

[drsnyder]

Poky will go into an unstable state when an IOError is encountered. I'm not sure what we could do about this other than to handle the exception properly.

2013-09-05 21:42:55.155:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:9091
Exception: java.lang.ClassCastException: java.io.IOException cannot be cast to java.sql.SQLException
                   util.clj:77 poky.kv.jdbc.util/format-sql-exception
                   util.clj:83 poky.kv.jdbc.util/warn-sql-exception[fn]
                 core.clj:2487 clojure.core/map[fn]
               LazySeq.java:42 clojure.lang.LazySeq.sval
               LazySeq.java:60 clojure.lang.LazySeq.seq
                  Cons.java:39 clojure.lang.Cons.next
               LazySeq.java:92 clojure.lang.LazySeq.next
                   RT.java:598 clojure.lang.RT.next
                   core.clj:64 clojure.core/next
                 core.clj:2781 clojure.core/dorun
                 core.clj:2796 clojure.core/doall
                   util.clj:84 poky.kv.jdbc.util/warn-sql-exception
                  util.clj:191 poky.kv.jdbc.util/jdbc-mset
                   jdbc.clj:33 poky.kv.jdbc/poky.kv.jdbc.JdbcKeyValue
                  http.clj:185 poky.protocol.http/multi-set
                  http.clj:196 poky.protocol.http/multi-handler
                  http.clj:212 poky.protocol.http/multi-routes[fn]
                   core.clj:93 compojure.core/make-route[fn]
                   core.clj:39 compojure.core/if-route[fn]
                   core.clj:24 compojure.core/if-method[fn]
                  core.clj:106 compojure.core/routing[fn]
                 core.clj:2443 clojure.core/some
                  core.clj:106 compojure.core/routing
               RestFn.java:139 clojure.lang.RestFn.applyTo
                  core.clj:619 clojure.core/apply
                  core.clj:111 compojure.core/routes[fn]
              new_relic.clj:28 ring.middleware.new-relic/wrap-transaction-name[fn]
                  core.clj:106 compojure.core/routing[fn]
                 core.clj:2443 clojure.core/some
                  core.clj:106 compojure.core/routing
               RestFn.java:423 clojure.lang.RestFn.invoke
                  http.clj:226 poky.protocol.http/api[fn]
                  core.clj:164 compojure.core/wrap-context[fn]
                   core.clj:39 compojure.core/if-route[fn]
                  core.clj:106 compojure.core/routing[fn]
                 core.clj:2443 clojure.core/some
                  core.clj:106 compojure.core/routing
               RestFn.java:139 clojure.lang.RestFn.applyTo
                  core.clj:619 clojure.core/apply
                  core.clj:111 compojure.core/routes[fn]
         keyword_params.clj:27 ring.middleware.keyword-params/wrap-keyword-params[fn]
          nested_params.clj:65 ring.middleware.nested-params/wrap-nested-params[fn]
                 params.clj:55 ring.middleware.params/wrap-params[fn]
          format_params.clj:76 ring.middleware.format-params/wrap-format-params[fn]
                  http.clj:139 poky.protocol.http/wrap-charset[fn]
             stacktrace.clj:15 ring.middleware.stacktrace/wrap-stacktrace-log[fn]
             stacktrace.clj:79 ring.middleware.stacktrace/wrap-stacktrace-web[fn]
                 statsd.clj:19 ring.middleware.statsd/wrap-request-method-counter[fn]
                 statsd.clj:34 ring.middleware.statsd/wrap-response-code-counter[fn]

[loganlinn]

Maybe we should add a middleware like,

(defn wrap-catchall-exception-handler [handler]
  (fn [req]
    (try
      (handler req)
      (catch Exception e
        {:status 500
         :headers {"Content-Type" "text/plain"}
         :body "We're sorry, something went wrong."}))))