Clojure base-image for Dispatch: initial implementation

Author: Ivan Mikushin

.gitignore

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+target
+classes
+checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+.lein-*
+.nrepl-port
+.cpcache

Dockerfile

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+FROM vmware/photon2:20180409 AS build
+
+
+## Install JDK10
+
+RUN tdnf install -yq tar gzip && curl -f https://cdn.azul.com/zulu/bin/zulu10.1+11-jdk10-linux_x64.tar.gz | tar -xzf -
+ENV PATH=/zulu10.1+11-jdk10-linux_x64/bin:${PATH}
+
+
+## Install lein and clojure
+
+RUN curl -f https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein > /usr/local/bin/lein && \
+    chmod +x /usr/local/bin/lein && lein version
+
+RUN curl -f -O https://download.clojure.org/install/linux-install-1.9.0.372.sh && \
+    chmod +x linux-install-1.9.0.372.sh && \
+    ./linux-install-1.9.0.372.sh && \
+    clojure -Stree
+
+
+## Build func-server
+
+COPY func-server /func-server
+RUN cd /func-server && lein install && cp deps.edn /root/.clojure/
+
+
+## Copy image-template and function-template and save their paths in the metadata
+
+ARG IMAGE_TEMPLATE=/image-template
+ARG FUNCTION_TEMPLATE=/function-template
+
+LABEL io.dispatchframework.imageTemplate="${IMAGE_TEMPLATE}" \
+      io.dispatchframework.functionTemplate="${FUNCTION_TEMPLATE}"
+
+COPY image-template ${IMAGE_TEMPLATE}/
+COPY function-template ${FUNCTION_TEMPLATE}/
+
+
+## Set FUNCTION_MODULE and PORT, expose $PORT
+
+ENV FUNCTION_MODULE=/function/function.clj PORT=8080
+EXPOSE ${PORT}

LICENSE

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README.md

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+# clojure-base-image
+Clojure (on JVM) support for Dispatch

build.sh

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+#!/bin/sh
+set -e -x
+
+docker build -t clojure-base-image .

func-server/deps.edn

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+{:deps {func-server {:mvn/version "0.1.0-SNAPSHOT"}}}

func-server/project.clj

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+(defproject func-server "0.1.0-SNAPSHOT"
+  :description "Dispatch Function Runtime API Server for Clojure"
+  :url "http://example.com/FIXME"
+  :license {:name "Apache License 2.0"
+            :url  "http://www.apache.org/licenses/LICENSE-2.0"}
+  :dependencies [[org.clojure/clojure "1.9.0"]
+                 [org.clojure/tools.logging "0.4.0"]
+                 [http-kit "2.3.0-beta2"]
+                 [compojure "1.6.0"]
+                 [ring/ring-core "1.6.3"]
+                 [ring/ring-json "0.5.0-beta1"]
+                 [cheshire "5.8.0"]]
+  :aot :all
+  :jvm-opts ["-Dclojure.compiler.direct-linking=true"]
+  :main func-server.main)

func-server/src/func_server/core.clj

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+(ns func-server.core
+  (:require [clojure.tools.logging :as log]
+            [clojure.tools.logging.impl :as li]
+            [clojure.string :as string]
+            [clojure.spec.alpha :as s]))
+
+
+(defn- logs? [logs]
+  (and (instance? clojure.lang.Atom logs)
+       (vector? @logs)))
+
+(defn- ns? [n]
+  (instance? clojure.lang.Namespace n))
+
+
+(defn write-log! [logs message]
+  (swap! logs conj message))
+
+(s/fdef write-log!
+  :args (s/cat :logs logs?
+               :message string?))
+
+
+(defn level-name [level]
+  (-> level
+      name
+      string/upper-case))
+
+(s/fdef level-name
+  :args (s/cat :level keyword?))
+
+
+(defn format-msg [ns level message throwable]
+  (str (level-name level) ": " ns ": " message (if throwable " - " throwable)))
+
+
+(defn- new-logger [logs ns]
+  (reify li/Logger
+    (enabled? [_ _] true)
+    (write! [_ level throwable message]
+      (case level
+        ::stderr (write-log! logs message)
+        ::stdout (write-log! logs message)
+        (write-log! logs (format-msg ns level message throwable))))))
+
+(def logger (memoize new-logger))
+
+(s/fdef logger
+  :args (s/cat :logs logs?
+               :ns ns?))
+
+
+(defn logger-factory [logs]
+  (reify li/LoggerFactory
+    (name [_] "function")
+    (get-logger [_ ns]
+      (logger logs ns))))
+
+(s/fdef logger-factory
+  :args (s/cat :logs logs?))
+
+
+(defn capture-error [f]
+  (fn [{:keys [context payload]}]
+    (try
+      {:context {:error nil}
+       :payload (f context payload)}
+      (catch Exception e
+        {:context {:error {:message    (-> e .getMessage)
+                           :stackTrace (->> e .getStackTrace vec (map str))}}
+         :payload nil}))))
+
+
+(defn capture-logs [f]
+  (let [function-ns (create-ns 'function)]
+    (fn [message]
+      (let [logs (atom [])]
+        (binding [log/*logger-factory* (logger-factory logs)]
+          (log/with-logs [function-ns ::stdout ::stderr]
+            (try
+              (log/log-capture! function-ns ::stdout ::stderr)
+              (update-in (f message) [:context :logs] (constantly @logs))
+              (finally
+                (log/log-uncapture!)))))))))
+
+
+(defn wrap-func [f]
+  (-> f
+      capture-error
+      capture-logs))

func-server/src/func_server/main.clj

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+(ns func-server.main
+  (:require [clojure.repl :as repl]
+            [func-server.routes :refer [app]]
+            [org.httpkit.server :as hk])
+  (:gen-class))
+
+
+(defn run-server [f]
+  (do
+    (println "Runtime API server for" (repl/demunge (str f)))
+    (hk/run-server (app f) {:port 8080})))
+
+
+(defn -dummy [context payload] payload)
+
+
+(defn -main []
+  (run-server -dummy))