#!@GUILE@ --no-auto-compile
-*- scheme -*-
-*- geiser-scheme-implementation: guile -*-
!#
;;; Nar Herder
;;;
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of the nar-herder.
;;;
;;; The Nar Herder is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; The Nar Herder is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with the guix-data-service.  If not, see
;;; <http://www.gnu.org/licenses/>.

(when (and (string-prefix? "aarch64-" %host-type)
           (not (getenv "GUILE_JIT_THRESHOLD")))
  (setenv "GUILE_JIT_THRESHOLD" "-1")
  (apply execlp (car (command-line)) (command-line)))

(setvbuf (current-output-port) 'line)
(setvbuf (current-error-port) 'line)

(let ((columns (string->number (or (getenv "COLUMNS") ""))))
  (setenv "COLUMNS"
          (number->string
           (if columns
               (max 256 columns)
               256))))

(use-modules (srfi srfi-1)
             (srfi srfi-19)
             (srfi srfi-37)
             (srfi srfi-43)
             (srfi srfi-71)
             (ice-9 ftw)
             (ice-9 match)
             (ice-9 format)
             (ice-9 threads)
             (ice-9 suspendable-ports)
             (web uri)
             (web client)
             (web response)
             (oop goops)
             (logging logger)
             (logging port-log)
             (prometheus)
             (fibers)
             ((guix ui) #:select (read/eval string->duration))
             (guix store)
             (guix narinfo)
             (guix progress)
             (guix derivations)
             ((guix store) #:select (store-path-hash-part))
             ((guix build utils) #:select (dump-port))
             (nar-herder utils)
             (nar-herder database)
             (nar-herder storage)
             (nar-herder server))

(install-suspendable-ports!)

(define %valid-log-levels
  '(DEBUG INFO WARN ERROR))

(define %base-options
  (list (option '("database") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'database
                              arg
                              result)))
        (option '("database-dump") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'database-dump
                              arg
                              result)))
        (option '("storage") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'storage
                              arg
                              (alist-delete 'storage result))))

        (option '("log-level") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'log-level
                              (let ((level (string->symbol (string-upcase arg))))
                                (if (member level %valid-log-levels)
                                    level
                                    (error
                                     (simple-format #f "unknown log level ~A\nvalid levels are: ~A\n"
                                                    level
                                                    %valid-log-levels))))
                              (alist-delete 'log-level result))))))

(define %base-option-defaults
  ;; Alist of default option values
  `((database . ,(string-append (getcwd) "/nar_herder.db"))
    (database-dump . ,(string-append (getcwd) "/nar_herder_dump.db"))

    (log-level                            . DEBUG)))

(define %import-options
  (list (option '("tag") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'tags
                              (cons (match (string-split arg #\=)
                                      ((key value)
                                       (cons key value)))
                                    (or (assq-ref result 'tags)
                                        '()))
                              (alist-delete 'tags result))))
        (option '("ensure-references-exist") #f #f
                (lambda (opt name _ result)
                  (alist-cons 'ensure-references-exist #t result)))))

(define %import-options-defaults
  '())

(define %server-options
  (list (option '("port") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'port
                              (string->number arg)
                              (alist-delete 'port result))))
        (option '("host") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'host
                              arg
                              (alist-delete 'host result))))
        (option '("pid-file") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'pid-file
                              arg
                              (alist-delete 'pid-file result))))
        (option '("storage-limit") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'storage-limit
                              (if (string=? arg "none")
                                  "none"
                                  (string->number arg))
                              (alist-delete 'storage-limit result))))

        ;; (stored-on https://other-nar-herder-server)
        ;; and=((stored-on https://other-nar-herder-server) (stored-on https://different-server))
        (option '("storage-nar-removal-criteria") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'storage-nar-removal-criteria
                              (match (string-split arg #\=)
                                ((sym rest)
                                 (list (string->symbol sym)
                                       (call-with-input-string rest read))))
                              result)))

        (option '("enable-cached-compression") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression
                              (match (string-split arg #\:)
                                ((type)
                                 `((type . ,(string->symbol type))))
                                ((type level)
                                 `((type  . ,(string->symbol type))
                                   (level . ,(string->number level)))))
                              result)))

        (option '("cached-compression-directory") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-directory
                              (match (string-split arg #\=)
                                ((type directory)
                                 (cons (string->symbol type)
                                       (canonicalize-path directory))))
                              result)))

        (option '("cached-compression-directory-max-size") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-directory-max-size
                              (match (string-split arg #\=)
                                ((type size)
                                 (cons (string->symbol type)
                                       (string->number size))))
                              result)))

        (option '("cached-compression-min-uses") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-min-uses
                              (string->number arg)
                              (alist-delete 'cached-compression-min-uses
                                            result))))

        (option '("cached-compression-workers") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-workers
                              (string->number arg)
                              result)))

        (option '("cached-compression-nar-source") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-nar-source
                              arg
                              (alist-delete 'cached-compression-nar-source
                                            result))))
        (option '("cached-compression-unused-removal-duration") #t #f
                (lambda (opt name arg result)
                  (alist-cons
                   'cached-compression-unused-removal-duration
                   (match (string-split arg #\=)
                     ((_)
                      (simple-format
                       (current-error-port)
                       "cached-compressions-unused-removal-duration: you must specify compression and value\n")
                      (exit 1))
                     ((type duration-string)
                      (cons (string->symbol type)
                            (let ((duration (string->duration duration-string)))
                              (unless duration
                                (simple-format
                                 (current-error-port)
                                 "~A: cached-compressions-unused-removal-duration: invalid duration\n"
                                 arg)
                                (exit 1))

                              duration))))
                   result)))
        (option '("cached-compressions-ttl") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'cached-compression-ttl
                              (match (string-split arg #\=)
                                ((_)
                                 (simple-format
                                  (current-error-port)
                                  "cached-compressions-ttl: you must specify compression and value\n")
                                 (exit 1))
                                ((type ttl-string)
                                 (let ((duration (string->duration ttl-string)))
                                   (unless duration
                                     (simple-format (current-error-port)
                                                    "~A: invalid duration\n"
                                                    arg)
                                     (exit 1))

                                   (cons (string->symbol type)
                                         (time-second duration)))))
                              result)))
        (option '("cached-compressions-new-ttl") #t #f
                (lambda (opt name arg result)
                  (let ((duration (string->duration arg)))
                    (unless duration
                      (simple-format (current-error-port)
                                     "~A: invalid duration\n"
                                     arg)
                      (exit 1))
                    (alist-cons 'cached-compression-new-ttl
                                (match (string-split arg #\=)
                                  ((type size)
                                   (cons (string->symbol type)
                                         (time-second duration))))
                                result))))

        (option '("ttl") #t #f
                (lambda (opt name arg result)
                  (let ((duration (string->duration arg)))
                    (unless duration
                      (simple-format (current-error-port)
                                     "~A: invalid duration\n"
                                     arg)
                      (exit 1))
                    (alist-cons 'narinfo-ttl (time-second duration)
                                result))))
        (option '("new-ttl") #t #f
                (lambda (opt name arg result)
                  (let ((duration (string->duration arg)))
                    (unless duration
                      (simple-format (current-error-port)
                                     "~A: invalid duration\n"
                                     arg)
                      (exit 1))
                    (alist-cons 'new-narinfo-ttl (time-second duration)
                                result))))
        (option '("negative-ttl") #t #f
                (lambda (opt name arg result)
                  (let ((duration (string->duration arg)))
                    (unless duration
                      (simple-format (current-error-port)
                                     "~A: invalid duration\n"
                                     arg)
                      (exit 1))
                    (alist-cons 'narinfo-negative-ttl (time-second duration)
                                result))))

        (option '("recent-changes-limit") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'recent-changes-limit
                              (string->number arg)
                              (alist-delete 'recent-changes-limit result))))

        (option '("mirror") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'mirror
                              arg
                              (alist-delete 'mirror result))))

        (option '("parallelism") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'parallelism
                              (string->number arg)
                              (alist-delete 'parallelism result))))

        (option '("database-reader-threads") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'database-reader-threads
                              (string->number arg)
                              (alist-delete 'database-reader-threads result))))))

(define %server-option-defaults
  `((port                                 . 8080)
    (host                                 . "0.0.0.0")

    (storage-limit                        . "none")

    (cached-compression-workers           . 2)
    (cached-compression-min-uses          . 3)

    (recent-changes-limit                 . 32768)

    (database-reader-threads              . ,(min (max (current-processor-count)
                                                       2)
                                                  64))

    (parallelism                          . 1)))

(define %check-options
  (list))

(define %check-option-defaults
  '())

(define (parse-options options defaults args)
  (args-fold
   args options
   (lambda (opt name arg result)
     (error "unrecognized option" name))
   (lambda (arg result)
     (alist-cons
      'arguments
      (cons arg
            (or (assoc-ref result 'arguments)
                '()))
      (alist-delete 'arguments result)))
   defaults))

(match (cdr (program-arguments))
  (("import" rest ...)
   (let* ((opts (parse-options (append %base-options
                                       %import-options)
                               (append %base-option-defaults
                                       %import-options-defaults)
                               rest))
          (metrics-registry
           (make-metrics-registry #:namespace
                                  "narherder"))
          (database (setup-database
                     (assq-ref opts 'database)
                     metrics-registry)))
     (let* ((narinfos
             (append-map
              (lambda (file-or-dir)
                (let ((s (stat file-or-dir)))
                  (match (stat:type s)
                    ('regular (list file-or-dir))
                    ('directory
                     (let ((dir file-or-dir))
                       (map
                        (lambda (nar-filename)
                          (string-append dir
                                         (if (string-suffix? "/" dir)
                                             ""
                                             "/")
                                         nar-filename))
                        (scandir file-or-dir
                                 (lambda (name)
                                   (string-suffix? ".narinfo" name)))))))))
              (assq-ref opts 'arguments)))
            (len (length narinfos))
            (progress
             (if (= 1 len)
                 progress-reporter/silent
                 (progress-reporter/bar len
                                        (format #f "importing ~a narinfos"
                                                len)
                                        (current-error-port)))))

       (call-with-progress-reporter progress
         (lambda (report)
           (database-call-with-transaction
            database
            (lambda (db)
              (let* ((canonical-storage
                      (and=> (assq-ref opts 'storage)
                             canonicalize-path))
                     (read-narinfos
                      (map
                       (lambda (narinfo-file)
                         (let ((narinfo
                                (call-with-input-file narinfo-file
                                  (lambda (port)
                                    ;; Set url to a dummy value as this doesn't
                                    ;; matter
                                    (read-narinfo port
                                                  "https://narherderdummyvalue")))))

                           (when canonical-storage
                             (for-each
                              (lambda (uri)
                                (unless (string=? canonical-storage
                                                  (dirname narinfo-file))
                                  (let ((source
                                         (string-append
                                          (dirname narinfo-file)
                                          "/" (uri-decode (uri-path uri))))
                                        (dest
                                         (string-append
                                          canonical-storage
                                          "/" (uri-decode (uri-path uri)))))
                                    (simple-format (current-error-port)
                                                   "moving ~A to ~A\n"
                                                   source dest)
                                    (rename-file source dest))))
                              (narinfo-uris narinfo)))

                           (database-insert-narinfo
                            database
                            narinfo
                            #:tags (or (assq-ref opts 'tags)
                                       '()))

                           (report)

                           narinfo))
                       narinfos)))

                (when (assq-ref opts 'ensure-references-exist)
                  (for-each
                   (lambda (narinfo)
                     (let ((self-reference
                            (store-path-base
                             (narinfo-path narinfo))))
                       (for-each
                        (lambda (reference)
                          (when (and
                                 (not
                                  (string=? reference self-reference))
                                 (not
                                  (database-select-narinfo-by-hash
                                   database
                                   (string-take reference 32))))
                            (error
                             (simple-format (current-error-port)
                                            "missing reference to ~A\n"
                                            reference))))
                        (narinfo-references narinfo))))
                   read-narinfos)))))))
       (when (= 1 len)
         (simple-format (current-error-port) "imported narinfo\n")))))
  (("remove" rest ...)
   (let* ((opts (parse-options %base-options
                               %base-option-defaults
                               rest))
          (metrics-registry
           (make-metrics-registry #:namespace
                                  "narherder"))
          (database (setup-database
                     (assq-ref opts 'database)
                     metrics-registry))
          (lgr (make <logger>))
          (port-log (make <port-log>
                      #:port (current-output-port)
                      #:formatter
                      ;; In guile-lib v0.2.8 onwards, the formatter is
                      ;; called with more arguments
                      (lambda args      ; lvl, time, str
                        (format #f "~a (~5a): ~a~%"
                                (strftime "%F %H:%M:%S" (localtime
                                                         (second args)))
                                (first args)
                                (third args))))))

     (add-handler! lgr port-log)
     (open-log! lgr)
     (set-default-logger! lgr)

     (for-each
      (lambda (store-path)
        (let ((narinfo-details
               (database-select-narinfo-by-hash
                database
                (store-path-hash-part store-path))))

          (if narinfo-details
              (let ((cached-narinfo-files
                     (database-select-cached-narinfo-files-by-narinfo-id
                      database
                      (assq-ref narinfo-details 'id))))

                (log-msg 'INFO "removing " store-path)

                (if (assq-ref opts 'storage)
                    (begin
                      (remove-nar-files-by-hash
                       database
                       (assq-ref opts 'storage)
                       metrics-registry
                       (store-path-hash-part store-path)
                       #:error-unless-files-to-remove? #f))
                    (log-msg
                     'WARN "no --storage set, so just removing from the database"))

                (for-each
                 (lambda (cached-narinfo-details)
                   ;; It might not have been scheduled for
                   ;; removal, but remove any schedule that
                   ;; exists
                   (database-delete-scheduled-cached-narinfo-removal
                    database
                    (assq-ref cached-narinfo-details 'id))

                   ;; Remove all the database entries first, as
                   ;; that'll stop these files appearing in narinfos
                   (database-remove-cached-narinfo-file
                    database
                    (assq-ref narinfo-details 'id)
                    (symbol->string
                     (assq-ref cached-narinfo-details 'compression))))
                 cached-narinfo-files)

                (database-remove-narinfo database store-path))
              (log-msg 'WARN store-path " not found to remove"))))
      (assq-ref opts 'arguments))))
  (("check" rest ...)
   (let* ((opts (parse-options (append %base-options
                                       %check-options)
                               (append %base-option-defaults
                                       %check-option-defaults)
                               rest))
          (lgr (make <logger>))
          (port-log (make <port-log>
                      #:port (current-output-port)
                      #:formatter
                      ;; In guile-lib v0.2.8 onwards, the formatter is
                      ;; called with more arguments
                      (lambda args      ; lvl, time, str
                        (format #f "~a (~5a): ~a~%"
                                (strftime "%F %H:%M:%S" (localtime
                                                         (second args)))
                                (first args)
                                (third args)))))
          (metrics-registry (make-metrics-registry
                             #:namespace
                             "narherder")))

     (add-handler! lgr port-log)
     (open-log! lgr)
     (set-default-logger! lgr)

     (let ((log-level (assq-ref opts 'log-level)))
       (let loop ((levels %valid-log-levels))
         (when (and (not (null? levels))
                    (not (eq? (car levels) log-level)))
           (disable-log-level! lgr (car levels))
           (loop (cdr levels)))))

     (let* ((database (setup-database (assq-ref opts 'database)
                                      metrics-registry))
            (canonical-storage (and=> (assq-ref opts 'storage)
                                      canonicalize-path)))

       (check-storage database
                      canonical-storage
                      metrics-registry))))
  (("run-server" rest ...)
   (simple-format (current-error-port) "locale is ~A\n" (check-locale!))

   (let* ((opts (parse-options (append %base-options
                                       %server-options)
                               (append %base-option-defaults
                                       %server-option-defaults)
                               rest))
          (unknown-arguments
           (or (assq-ref opts 'arguments)
               '()))
          (lgr (make <logger>))
          (port-log (make <port-log>
                      #:port (current-output-port)
                      #:formatter
                      ;; In guile-lib v0.2.8 onwards, the formatter is
                      ;; called with more arguments
                      (lambda args      ; lvl, time, str
                        (format #f "~a (~5a): ~a~%"
                                (strftime "%F %H:%M:%S" (localtime
                                                         (second args)))
                                (first args)
                                (third args))))))

     (add-handler! lgr port-log)
     (open-log! lgr)
     (set-default-logger! lgr)

     (let ((log-level (assq-ref opts 'log-level)))
       (let loop ((levels %valid-log-levels))
         (when (and (not (null? levels))
                    (not (eq? (car levels) log-level)))
           (disable-log-level! lgr (car levels))
           (loop (cdr levels)))))

     (unless (null? unknown-arguments)
       (simple-format (current-error-port)
                      "unknown arguments: ~A\n"
                      unknown-arguments)
       (exit 1))

     (unless (or (assq-ref opts 'mirror)
                 (assq-ref opts 'storage))
       (simple-format (current-error-port)
                      "error: you must specify --mirror or --storage\n")
       (exit 1))

     (and=> (assq-ref opts 'pid-file)
            (lambda (pid-file)
              (call-with-output-file pid-file
                (lambda (port)
                  (simple-format port "~A\n" (getpid))))))

     (with-fluids ((%file-port-name-canonicalization 'none))
       (run-nar-herder-service opts lgr)))))