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uberjar.clj
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uberjar.clj
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(ns hf.depstar.uberjar
(:require [clojure.edn :as edn]
[clojure.java.io :as jio]
[clojure.string :as str])
(:import [java.io InputStream PushbackReader]
[java.nio.file CopyOption LinkOption OpenOption
StandardCopyOption StandardOpenOption
FileSystem FileSystems Files
FileVisitResult FileVisitor
Path]
[java.nio.file.attribute FileAttribute]
[java.util.jar JarInputStream JarEntry]))
(set! *warn-on-reflection* true)
(def ^:dynamic ^:private *debug* nil)
(def ^:dynamic ^:private *verbose* nil)
(defn env-prop
"Given a setting name, get its Boolean value from the environment,
validate it, and return the value (or nil if no setting is present)."
[setting]
(let [env-setting (str "DEPSTAR_" (str/upper-case setting))
prop-setting (str "depstar." (str/lower-case setting))]
(when-let [level (or (System/getenv env-setting)
(System/getProperty prop-setting))]
(case level
"true" true
"false" false ;; because (if (Boolean. "false") :is-truthy :argh!)
(throw (ex-info (str "depstar " setting
" should be true or false")
{:level level
:env (System/getenv env-setting)
:property (System/getProperty prop-setting)}))))))
(defonce ^FileSystem FS (FileSystems/getDefault))
;; could add (StandardOpenOption/valueOf "SYNC") here as well but that
;; could slow things down (and hasn't yet proved to be necessary)
(def open-opts (into-array OpenOption [(StandardOpenOption/valueOf "CREATE")]))
(def copy-opts (into-array CopyOption [(StandardCopyOption/valueOf "REPLACE_EXISTING")]))
(defonce errors (atom 0))
(defn path
^Path [s]
(.getPath FS s (make-array String 0)))
(defn clash-strategy
[filename]
(cond
(= "data_readers.clj" filename)
:merge-edn
(re-find #"^META-INF/services/" filename)
:concat-lines
:else
:noop))
(defmulti clash (fn [filename in target]
(let [stategy (clash-strategy filename)]
(prn {:warning "clashing jar item" :path filename :strategy stategy})
stategy)))
(defmethod clash
:merge-edn
[_ in target]
(let [;; read but do not close input stream
f1 (edn/read (PushbackReader. (jio/reader in)))
;; read and then close target since we will rewrite it
f2 (with-open [r (PushbackReader. (Files/newBufferedReader target))]
(edn/read r))]
(with-open [w (Files/newBufferedWriter target open-opts)]
(binding [*out* w]
(prn (merge f1 f2))))))
(defmethod clash
:concat-lines
[_ in target]
(let [f1 (line-seq (jio/reader in))
f2 (Files/readAllLines target)]
(with-open [w (Files/newBufferedWriter target open-opts)]
(binding [*out* w]
(run! println (-> (vec f1)
(conj "\n")
(into f2)))))))
(defmethod clash
:default
[_ in target]
;; do nothing, first file wins
nil)
(def ^:private exclude-patterns
"Filename patterns to exclude. These are checked with re-matches and
should therefore be complete filename matches including any path."
[#"project.clj"
#"LICENSE"
#"COPYRIGHT"
#".*\.pom$" #"module-info\.class$"
#"(?i)META-INF/.*\.(?:MF|SF|RSA|DSA)"
#"(?i)META-INF/(?:INDEX\.LIST|DEPENDENCIES|NOTICE|LICENSE)(?:\.txt)?"])
(defn excluded?
[filename]
(some #(re-matches % filename) exclude-patterns))
(defn copy!
;; filename drives strategy
[filename ^InputStream in ^Path target last-mod]
(if-not (excluded? filename)
(if (Files/exists target (make-array LinkOption 0))
(clash filename in target)
(do
(Files/copy in target ^"[Ljava.nio.file.CopyOption;" copy-opts)
(when last-mod
(Files/setLastModifiedTime target last-mod))))
(when *debug*
(prn {:excluded filename}))))
(defn consume-jar
[^Path path f]
(with-open [is (-> path
(Files/newInputStream (make-array OpenOption 0))
java.io.BufferedInputStream.
JarInputStream.)]
(loop []
(when-let [entry (.getNextJarEntry is)]
(f is entry)
(recur)))))
(defn classify
[entry]
(let [p (path entry)
symlink-opts (make-array LinkOption 0)]
(if (Files/exists p symlink-opts)
(cond
(Files/isDirectory p symlink-opts)
:directory
(and (Files/isRegularFile p symlink-opts)
(re-find #"\.jar$" (.toString p)))
:jar
:else :unknown)
:not-found)))
(defmulti copy-source*
(fn [src dest options]
(classify src)))
(defmethod copy-source*
:jar
[src dest options]
(when-not (= :thin (:jar options))
(when *verbose* (println src))
(consume-jar (path src)
(fn [inputstream ^JarEntry entry]
(let [name (.getName entry)
last-mod (.getLastModifiedTime entry)
target (.resolve ^Path dest name)]
(if (.isDirectory entry)
(Files/createDirectories target (make-array FileAttribute 0))
(do (Files/createDirectories (.getParent target) (make-array FileAttribute 0))
(try
(copy! name inputstream target last-mod)
(catch Throwable t
(prn {:error "unable to copy file"
:name name
:exception (class t)
:message (.getMessage t)})
(swap! errors inc))))))))))
(defn copy-directory
[^Path src ^Path dest]
(let [copy-dir
(reify FileVisitor
(visitFile [_ p attrs]
(let [f (.relativize src p)
last-mod (Files/getLastModifiedTime p (make-array LinkOption 0))]
(when *verbose* (println (str (.toString src) "/" (.toString f))))
(with-open [is (Files/newInputStream p (make-array OpenOption 0))]
(copy! (.toString f) is (.resolve dest (.toString f)) last-mod)))
FileVisitResult/CONTINUE)
(preVisitDirectory [_ p attrs]
(Files/createDirectories (.resolve dest (.toString (.relativize src p)))
(make-array FileAttribute 0))
FileVisitResult/CONTINUE)
(postVisitDirectory [_ p ioexc]
(if ioexc (throw ioexc) FileVisitResult/CONTINUE))
(visitFileFailed [_ p ioexc] (throw (ex-info "Visit File Failed" {:p p} ioexc))))]
(Files/walkFileTree src copy-dir)
:ok))
(defmethod copy-source*
:directory
[src dest options]
(when *verbose* (println src))
(copy-directory (path src) dest))
(defmethod copy-source*
:not-found
[src _dest _options]
(prn {:warning "could not find classpath entry" :path src}))
(defn copy-source
[src dest options]
(copy-source* src dest options))
(defn current-classpath
[]
(vec (.split ^String
(System/getProperty "java.class.path")
(System/getProperty "path.separator"))))
(defn depstar-itself?
[p]
(re-find #"depstar" p))
(defn run
[{:keys [dest jar verbose] :or {jar :uber} :as options}]
(let [cp (into [] (remove depstar-itself?) (current-classpath))
tmp-dir (Files/createTempDirectory "depstar" (make-array FileAttribute 0))
dest-name (str/replace dest #"^.*[/\\]" "")
jar-path (.resolve tmp-dir ^String dest-name)
jar-file (java.net.URI. (str "jar:" (.toUri jar-path)))
zip-opts (doto (java.util.HashMap.)
(.put "create" "true")
(.put "encoding" "UTF-8"))]
(with-open [zfs (FileSystems/newFileSystem jar-file zip-opts)]
(let [tmp (.getPath zfs "/" (make-array String 0))]
(reset! errors 0)
(println "Building" (name jar) "jar:" dest)
(binding [*debug* (env-prop "debug")
*verbose* verbose]
(run! #(copy-source % tmp options) cp))))
(let [dest-path (path dest)
parent (.getParent dest-path)]
(when parent (.. parent toFile mkdirs))
(Files/move jar-path dest-path copy-opts))
(when (pos? @errors)
(println "\nCompleted with errors!")
(System/exit 1))))
(defn -main
[destination & [verbose]]
(when verbose
(when-not (#{"-v" "--verbose"} verbose)
(throw (ex-info "Expected -v or --verbose option" {:option verbose}))))
(run {:dest destination :verbose verbose}))