Add CIDER log middleware

.clj-kondo/config.edn

@@ -1,5 +1,6 @@
 {:hooks {:analyze-call {cider.nrepl.middleware.out/with-out-binding
                         hooks.core/with-out-binding}}
+ :lint-as {cider.nrepl.middleware.log-test/with-each-framework clojure.core/let}
  :linters {:unresolved-symbol {:exclude [(cider.nrepl/def-wrapper)
                                          (cider.nrepl.middleware.util.instrument/definstrumenter)
                                          (cider.nrepl.middleware.util.instrument/with-break)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### New features
+
+* [#773](https://github.com/clojure-emacs/cider-nrepl/pull/773) Add middleware to capture, debug, inspect and view log events emitted by Java logging frameworks.
+
 ### Changes
 
 * Bump `orchard` to 0.12.0.

doc/modules/ROOT/pages/nrepl-api/supplied_middleware.adoc

@@ -57,6 +57,12 @@
 | `inspect-(start/refresh/pop/push/reset/get-path)`
 | Inspect a Clojure expression.
 
+| `wrap-log`
+| 0.30.1
+| No
+| `cider/log-add-appender`, `cider/log-add-consumer`, `cider/log-analyze-stacktrace`, `cider/log-clear-appender`, `cider/log-exceptions`, `cider/log-format-event`, `cider/log-frameworks`, `cider/log-inspect-event`, `cider/log-levels`, `cider/log-loggers`, `cider/log-remove-appender`, `cider/log-remove-consumer`, `cider/log-search`, `cider/log-update-appender`, `cider/log-update-consumer`, `cider/log-threads`
+| Capture, debug, inspect and view log events emitted by Java logging frameworks.
+
 | `wrap-macroexpand`
 | -
 | Yes

doc/modules/ROOT/pages/usage.adoc

@@ -41,6 +41,7 @@ under `:repl-options`.
                   cider.nrepl/wrap-format
                   cider.nrepl/wrap-info
                   cider.nrepl/wrap-inspect
+                  cider.nrepl/wrap-log
                   cider.nrepl/wrap-macroexpand
                   cider.nrepl/wrap-ns
                   cider.nrepl/wrap-spec
@@ -153,6 +154,7 @@ That's how CIDER's nREPL handler is created:
     cider.nrepl/wrap-format
     cider.nrepl/wrap-info
     cider.nrepl/wrap-inspect
+    cider.nrepl/wrap-log
     cider.nrepl/wrap-macroexpand
     cider.nrepl/wrap-ns
     cider.nrepl/wrap-out

project.clj

@@ -18,7 +18,8 @@
                  ^:inline-dep [cljfmt "0.9.2" :exclusions [org.clojure/clojurescript]]
                  ^:inline-dep [org.clojure/tools.namespace "1.3.0"]
                  ^:inline-dep [org.clojure/tools.trace "0.7.11"]
-                 ^:inline-dep [org.clojure/tools.reader "1.3.6"]]
+                 ^:inline-dep [org.clojure/tools.reader "1.3.6"]
+                 [mx.cider/logjam "0.1.1"]]
   :exclusions [org.clojure/clojure] ; see Clojure version matrix in profiles below
 
   :pedantic? ~(if (System/getenv "CI")
@@ -102,9 +103,13 @@
              :test {:global-vars {*assert* true}
                     :source-paths ["test/src"]
                     :java-source-paths ["test/java"]
+                    :jvm-opts ["-Djava.util.logging.config.file=test/resources/logging.properties"]
                     :resource-paths ["test/resources"]
                     :dependencies [[boot/base "2.8.3"]
                                    [boot/core "2.8.3"]
+                                   ;; 1.3.7 and 1.4.7 are working, but we need 1.3.7 for JDK8
+                                   [ch.qos.logback/logback-classic "1.3.7"]
+                                   [org.clojure/test.check "1.1.1"]
                                    [org.apache.httpcomponents/httpclient "4.5.13" :exclusions [commons-logging]]
                                    [leiningen-core "2.9.10" :exclusions [org.clojure/clojure
                                                                          commons-codec

src/cider/nrepl.clj

@@ -284,6 +284,136 @@ Depending on the type of the return value of the evaluation this middleware may
                           "var-name" "The var name"}
                :returns {"status" "\"done\""}}}}))
 
+(def-wrapper wrap-log cider.nrepl.middleware.log/handle-log
+  {:doc "Middleware that captures log events and makes them inspect-able."
+   :requires #{#'session #'wrap-print}
+   :handles
+   {"cider/log-add-appender"
+    {:doc "Add an appender to a log framework."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "filters" "A map from filter name to filter condition."
+                "size" "The number of events the appender keeps in memory."
+                "threshold" "The threshold in percent used to cleanup events."}
+     :optional {"logger" "The name of the logger to attach to."}
+     :returns {"status" "done"
+               "cider/log-add-appender" "The appender that was added."}}
+
+    "cider/log-add-consumer"
+    {:doc "Add a consumer to an appender of a log framework."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "filters" "A map from filter name to filter condition."}
+     :returns {"status" "done"
+               "cider/log-add-consumer" "The consumer that was added."}}
+
+    "cider/log-analyze-stacktrace"
+    {:doc "Analyze the stacktrace of a log event."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "event" "The id of the event to inspect."}
+     :returns {"status" "done"}}
+
+    "cider/log-clear-appender"
+    {:doc "Clear all events of a log appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-clear-appender" "The appender that was cleared."}}
+
+    "cider/log-exceptions"
+    {:doc "Return the exceptions and their frequencies for the given framework and appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-exceptions" "A map from exception name to event frequency."}}
+
+    "cider/log-frameworks"
+    {:doc "Return the available log frameworks."
+     :returns {"status" "done"
+               "cider/log-frameworks" "A list of log frameworks."}}
+
+    "cider/log-format-event"
+    {:doc "Format a log event."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the log appender."
+                "event" "The id of the log event."}
+     :optional wrap-print-optional-arguments
+     :returns {"status" "done"
+               "cider/log-format-event" "The formatted log event."}}
+
+    "cider/log-inspect-event"
+    {:doc "Inspect a log event."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "event" "The id of the event to inspect."}
+     :returns {"status" "done"
+               "value" "The inspection result."}}
+
+    "cider/log-levels"
+    {:doc "Return the log levels and their frequencies for the given framework and appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-levels" "A map from log level to event frequency."}}
+
+    "cider/log-loggers"
+    {:doc "Return the loggers and their frequencies for the given framework and appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-loggers" "A map from logger name to event frequency."}}
+
+    "cider/log-remove-appender"
+    {:doc "Remove an appender from a log framework."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-remove-appender" "The removed appender."}}
+
+    "cider/log-remove-consumer"
+    {:doc "Remove a consumer from the appender of a log framework."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "consumer" "The name of the consumer."}
+     :returns {"status" "done"
+               "cider/log-add-consumer" "The removed consumer."}}
+
+    "cider/log-update-appender"
+    {:doc "Update the appender of a log framework."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "filters" "A map from filter name to filter condition."
+                "size" "The number of events the appender keeps in memory."
+                "threshold" "The threshold in percent used to cleanup events."}
+     :returns {"status" "done"
+               "cider/log-update-appender" "The updated appender."}}
+
+    "cider/log-update-consumer"
+    {:doc "Update the consumer of a log appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."
+                "consumer" "The name of the consumer."
+                "filters" "A map from filter name to filter condition."}
+     :returns {"status" "done"
+               "cider/log-update-consumer" "The consumer that was updated."}}
+
+    "cider/log-search"
+    {:doc "Search the log events of an appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :optional {"filters" "A map from filter name to filter condition."
+                "limit" "Number of log events to return."}
+     :returns {"status" "done"
+               "cider/log-search" "The list of log events matching the search."}}
+
+    "cider/log-threads"
+    {:doc "Return the threads and their frequencies for the given framework and appender."
+     :requires {"framework" "The id of the log framework."
+                "appender" "The name of the appender."}
+     :returns {"status" "done"
+               "cider/log-threads" "A map from thread name to event frequency."}}}})
+
 (def-wrapper wrap-macroexpand cider.nrepl.middleware.macroexpand/handle-macroexpand
   (cljs/requires-piggieback
    {:doc "Macroexpansion middleware."

src/cider/nrepl/middleware.clj

@@ -16,6 +16,7 @@
     cider.nrepl/wrap-format
     cider.nrepl/wrap-info
     cider.nrepl/wrap-inspect
+    cider.nrepl/wrap-log
     cider.nrepl/wrap-macroexpand
     cider.nrepl/wrap-ns
     cider.nrepl/wrap-out