all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 33cf6f4a1a07618283c88468748da80018c0d6eb 17251 bytes (raw)
name: guix/progress.scm 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
 
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Sou Bunnbu <iyzsong@gmail.com>
;;; Copyright © 2015 Steve Sprang <scs@stevesprang.com>
;;; Copyright © 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix progress)
  #:use-module (guix records)
  #:use-module (srfi srfi-19)
  #:use-module (rnrs io ports)
  #:use-module (rnrs bytevectors)
  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:export (<progress-reporter>
            progress-reporter
            make-progress-reporter
            progress-reporter?
            call-with-progress-reporter

            start-progress-reporter!
            stop-progress-reporter!
            progress-reporter-report!

            progress-reporter/silent
            progress-reporter/file
            progress-reporter/bar
            progress-reporter/trace
            progress-report-port

            display-download-progress
            erase-current-line
            progress-bar
            byte-count->string
            current-terminal-columns

            dump-port*))

;;; Commentary:
;;;
;;; Helper to write progress report code for downloads, etc.
;;;
;;; Code:

(define-record-type* <progress-reporter>
  progress-reporter make-progress-reporter progress-reporter?
  (start   progress-reporter-start)     ; thunk
  (report  progress-reporter-report)    ; procedure
  (stop    progress-reporter-stop))     ; thunk

(define (call-with-progress-reporter reporter proc)
  "Start REPORTER for progress reporting, and call @code{(@var{proc} report)}
with the resulting report procedure.  When @var{proc} returns, the REPORTER is
stopped."
  (match reporter
    (($ <progress-reporter> start report stop)
     (dynamic-wind start (lambda () (proc report)) stop))))

(define (start-progress-reporter! reporter)
  "Low-level procedure to start REPORTER."
  (match reporter
    (($ <progress-reporter> start report stop)
     (start))))

(define (progress-reporter-report! reporter . args)
  "Low-level procedure to lead REPORTER to emit a report."
  (match reporter
    (($ <progress-reporter> start report stop)
     (apply report args))))

(define (stop-progress-reporter! reporter)
  "Low-level procedure to stop REPORTER."
  (match reporter
    (($ <progress-reporter> start report stop)
     (stop))))

(define progress-reporter/silent
  (make-progress-reporter noop noop noop))

\f
;;;
;;; File download progress report.
;;;

(define (nearest-exact-integer x)
  "Given a real number X, return the nearest exact integer, with ties going to
the nearest exact even integer."
  (inexact->exact (round x)))

(define (duration->seconds duration)
  "Return the number of seconds represented by DURATION, a 'time-duration'
object, as an inexact number."
  (+ (time-second duration)
     (/ (time-nanosecond duration) 1e9)))

(define (seconds->string duration)
  "Given DURATION in seconds, return a string representing it in 'mm:ss' or
'hh:mm:ss' format, as needed."
  (if (not (number? duration))
      "00:00"
      (let* ((total-seconds (nearest-exact-integer duration))
             (extra-seconds (modulo total-seconds 3600))
             (num-hours     (quotient total-seconds 3600))
             (hours         (and (positive? num-hours) num-hours))
             (mins          (quotient extra-seconds 60))
             (secs          (modulo extra-seconds 60)))
        (format #f "~@[~2,'0d:~]~2,'0d:~2,'0d" hours mins secs))))

(define (byte-count->string size)
  "Given SIZE in bytes, return a string representing it in a human-readable
way."
  (let ((KiB 1024.)
        (MiB (expt 1024. 2))
        (GiB (expt 1024. 3))
        (TiB (expt 1024. 4)))
    (cond
     ((< size KiB) (format #f "~dB"     (nearest-exact-integer size)))
     ((< size MiB) (format #f "~dKiB"   (nearest-exact-integer (/ size KiB))))
     ((< size GiB) (format #f "~,1fMiB" (/ size MiB)))
     ((< size TiB) (format #f "~,2fGiB" (/ size GiB)))
     (else         (format #f "~,3fTiB" (/ size TiB))))))

(define (string-pad-middle left right len)
  "Combine LEFT and RIGHT with enough padding in the middle so that the
resulting string has length at least LEN (it may overflow).  If the string
does not overflow, the last char in RIGHT will be flush with the LEN
column."
  (let* ((total-used (+ (string-length left)
                        (string-length right)))
         (num-spaces (max 1 (- len total-used)))
         (padding    (make-string num-spaces #\space)))
    (string-append left padding right)))

(define (rate-limited proc interval)
  "Return a procedure that will forward the invocation to PROC when the time
elapsed since the previous forwarded invocation is greater or equal to
INTERVAL (a time-duration object), otherwise does nothing and returns #f."
  (let ((previous-at #f))
    (lambda args
      (let* ((now (current-time time-monotonic))
             (forward-invocation (lambda ()
                                   (set! previous-at now)
                                   (apply proc args))))
        (if previous-at
            (let ((elapsed (time-difference now previous-at)))
              (if (time>=? elapsed interval)
                  (forward-invocation)
                  #f))
            (forward-invocation))))))

(define current-terminal-columns
  ;; Number of columns of the terminal.
  (make-parameter 80))

(define-record-type* <progress-bar-style>
  progress-bar-style make-progress-bar-style progress-bar-style?
  (start  progress-bar-style-start)
  (stop   progress-bar-style-stop)
  (filled progress-bar-style-filled)
  (steps  progress-bar-style-steps))

(define ascii-bar-style
  (progress-bar-style
    (start #\[)
    (stop #\])
    (filled #\#)
    (steps '())))

(define unicode-bar-style
  (progress-bar-style
    (start #\x2595)
    (stop #\x258f)
    (filled #\x2588)
    (steps '(#\x258F #\x258E #\x258D #\x258C #\x258B #\x258A #\x2589))))

(define* (progress-bar % #:optional (bar-width 20))
  "Return % as a string representing an ASCII-art progress bar.  The total
width of the bar is BAR-WIDTH."
  (let* ((bar-style (if (equal? (port-encoding (current-output-port)) "UTF-8")
                        unicode-bar-style
                        ascii-bar-style))
         (bar-width (max 3 (- bar-width 2)))
         (intermediates (+ (length (progress-bar-style-steps bar-style)) 1))
         (step     (inexact->exact (floor (/ (* % bar-width intermediates) 100))))
         (filled   (quotient step intermediates))
         (intermediate
           (list-ref (cons #f (progress-bar-style-steps bar-style))
                     (modulo step intermediates)))
         (empty    (- bar-width filled (if intermediate 1 0))))
    (simple-format #f "~a~a~a~a~a"
                   (string (progress-bar-style-start bar-style))
                   (make-string filled (progress-bar-style-filled bar-style))
                   (if intermediate (string intermediate) "")
                   (make-string empty #\space)
                   (string (progress-bar-style-stop bar-style)))))

(define (erase-current-line port)
  "Write an ANSI erase-current-line sequence to PORT to erase the whole line and
move the cursor to the beginning of the line."
  (display "\r\x1b[K" port))

(define* (display-download-progress file size
                                    #:key
                                    (tty? #t)
                                    start-time (transferred 0)
                                    (log-port (current-error-port)))
  "Write the progress report to LOG-PORT.  Use START-TIME (a SRFI-19 time
object) and TRANSFERRED (a total number of bytes) to determine the
throughput.  When TTY? is false, assume LOG-PORT is not a tty and do not emit
ANSI escape codes."
  (define elapsed
    (duration->seconds
     (time-difference (current-time (time-type start-time))
                      start-time)))

  (cond ((and (not tty?)
              size (not (zero? size))
              transferred)
         ;; Display a dot for at most every 10%.
         (when (zero? (modulo (round (* 100. (/ transferred size))) 10))
           (display "." log-port)
           (force-output log-port)))
        ((and (number? size) (not (zero? size)))
         (let* ((%  (* 100.0 (/ transferred size)))
                (throughput (/ transferred elapsed))
                (left       (format #f " ~a  ~a" file
                                    (byte-count->string size)))
                (right      (format #f "~a/s ~a ~a~6,1f%"
                                    (byte-count->string throughput)
                                    (seconds->string elapsed)
                                    (progress-bar %) %)))
           (erase-current-line log-port)
           (display (string-pad-middle left right
                                       (current-terminal-columns))
                    log-port)
           (force-output log-port)))
        (else
         ;; If we don't know the total size, the last transfer will have a 0B
         ;; size.  Don't display it.
         (unless (zero? transferred)
           (let* ((throughput (/ transferred elapsed))
                  (left       (format #f " ~a" file))
                  (right      (format #f "~a/s ~a | ~a transferred"
                                      (byte-count->string throughput)
                                      (seconds->string elapsed)
                                      (byte-count->string transferred))))
             (erase-current-line log-port)
             (display (string-pad-middle left right
                                         (current-terminal-columns))
                      log-port)
             (force-output log-port))))))

(define %progress-interval
  ;; Default interval between subsequent outputs for rate-limited displays.
  (make-time time-duration 200000000 0))

(define* (progress-reporter/file file size
                                 #:optional (log-port (current-output-port))
                                 #:key (abbreviation basename))
  "Return a <progress-reporter> object to show the progress of FILE's download,
which is SIZE bytes long.  The progress report is written to LOG-PORT, with
ABBREVIATION used to shorten FILE for display."
  (let ((start-time (current-time time-monotonic))
        (transferred 0))
    (define (render)
      (display-download-progress (abbreviation file) size
                                 #:start-time start-time
                                 #:transferred transferred
                                 #:log-port log-port))

    (progress-reporter
     (start render)
     ;; Report the progress every 300ms or longer.
     (report
      (let ((rate-limited-render (rate-limited render %progress-interval)))
        (lambda (value)
          (set! transferred value)
          (rate-limited-render))))
     ;; Don't miss the last report.
     (stop render))))

(define* (progress-reporter/bar total
                                #:optional
                                (prefix "")
                                (port (current-error-port)))
  "Return a reporter that shows a progress bar every time one of the TOTAL
tasks is performed.  Write PREFIX at the beginning of the line."
  (define done 0)

  (define (draw-bar)
    (let* ((ratio (* 100. (/ done total))))
      (erase-current-line port)
      (if (string-null? prefix)
          (display (progress-bar ratio (current-terminal-columns)) port)
          (let ((width (- (current-terminal-columns)
                          (string-length prefix) 3)))
            (display prefix port)
            (display "  " port)
            (display (progress-bar ratio width) port)))
      (force-output port)))

  (define draw-bar/rate-limited
    (rate-limited draw-bar %progress-interval))

  (define (report-progress)
    (set! done (+ 1 done))
    (unless (> done total)
      (draw-bar/rate-limited)))

  (progress-reporter
   (start (lambda ()
            (set! done 0)))
   (report report-progress)
   (stop (lambda ()
           (erase-current-line port)
           (unless (string-null? prefix)
             (display prefix port)
             (newline port))
           (force-output port)))))

(define* (progress-reporter/trace file url size
                                  #:optional (log-port (current-output-port)))
  "Like 'progress-reporter/file', but instead of returning human-readable
progress reports, write \"build trace\" lines to be processed elsewhere."
  (define total 0)                                ;bytes transferred

  (define (report-progress transferred)
    (define message
      (format #f "@ download-progress ~a ~a ~a ~a~%"
              file url (or size "-") transferred))

    (display message log-port)                    ;should be atomic
    (flush-output-port log-port))

  (progress-reporter
   (start (lambda ()
            (set! total 0)
            (display (format #f "@ download-started ~a ~a ~a~%"
                             file url (or size "-"))
                     log-port)))
   (report (let ((report (rate-limited report-progress %progress-interval)))
             (lambda (transferred)
               (set! total transferred)
               (report transferred))))
   (stop (lambda ()
           (let ((size (or size total)))
             (report-progress size)
             (display (format #f "@ download-succeeded ~a ~a ~a~%"
                              file url size)
                      log-port))))))

;; TODO: replace '(@ (guix build utils) dump-port))'.
(define* (dump-port* in out
                     #:key (buffer-size 16384)
                     (reporter progress-reporter/silent))
  "Read as much data as possible from IN and write it to OUT, using chunks of
BUFFER-SIZE bytes.  After each successful transfer of BUFFER-SIZE bytes or
less, report the total number of bytes transferred to the REPORTER, which
should be a <progress-reporter> object."
  (define buffer
    (make-bytevector buffer-size))

  (call-with-progress-reporter reporter
    (lambda (report)
      (let loop ((total 0)
                 (bytes (get-bytevector-n! in buffer 0 buffer-size)))
        (or (eof-object? bytes)
            (let ((total (+ total bytes)))
              (put-bytevector out buffer 0 bytes)
              (report total)
              (loop total (get-bytevector-n! in buffer 0 buffer-size))))))))

(define* (progress-report-port reporter port
                               #:key
                               (close? #t)
                               download-size)
  "Return a port that continuously reports the bytes read from PORT using
REPORTER, which should be a <progress-reporter> object.  When CLOSE? is true,
PORT is closed when the returned port is closed.

When DOWNLOAD-SIZE is passed, do not read more than DOWNLOAD-SIZE bytes from
PORT.  This is important to avoid blocking when the remote side won't close
the underlying connection."
  (match reporter
    (($ <progress-reporter> start report stop)
     (let* ((total 0)
            (read! (lambda (bv start count)
                     (let* ((count (if download-size
                                       (min count (- download-size total))
                                       count))
                            (n (match (get-bytevector-n! port bv start count)
                                ((? eof-object?) 0)
                                (x x))))
                       (set! total (+ total n))
                       (report total)
                       n))))
       (start)
       (make-custom-binary-input-port "progress-port-proc"
                                      read! #f #f
                                      (lambda ()
                                        ;; XXX: Kludge!  When used through
                                        ;; 'decompressed-port', this port ends
                                        ;; up being closed twice: once in a
                                        ;; child process early on, and at the
                                        ;; end in the parent process.  Ignore
                                        ;; the early close so we don't output
                                        ;; a spurious "download-succeeded"
                                        ;; trace.
                                        (unless (zero? total)
                                          (stop))
                                        (when close?
                                          (close-port port))))))))


debug log:

solving 33cf6f4a1a ...
found 33cf6f4a1a in https://git.savannah.gnu.org/cgit/guix.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.