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pollen/cache.rkt

154 lines
7.6 KiB
Racket

#lang racket/base
(require racket/path racket/file compiler/cm file/cache sugar/coerce sugar/list "project.rkt" "world.rkt" "rerequire.rkt" "cache-ns.rkt" "debug.rkt" "file.rkt" racket/place)
;; The cache is a hash with paths as keys.
;; The cache values are also hashes, with key/value pairs for that path.
(provide reset-cache preheat-cache cached-require paths->key)
(define (reset-cache [starting-dir (world:current-project-root)])
(when (or (not (path-string? starting-dir)) (not (directory-exists? starting-dir)))
(error 'reset-cache (format "~a is not a directory" starting-dir)))
(for ([path (in-directory starting-dir)]
#:when (and (directory-exists? path)
(equal? (path->string (car (reverse (explode-path path)))) (world:current-cache-dir-name))))
(message (format "removing cache directory: ~a" path))
(delete-directory/files path)))
(define (preheat-cache [starting-dir (world:current-project-root)])
(when (or (not (path-string? starting-dir)) (not (directory-exists? starting-dir)))
(error 'preheat-cache (format "~a is not a directory" starting-dir)))
(define max-places 8) ; number of parallel processes to spawn at a time
(define paths-that-should-be-cached (for/list ([path (in-directory starting-dir)]
#:when (or (preproc-source? path)
(markup-source? path)
(markdown-source? path)
(pagetree-source? path)))
path))
;; if a file is already in the cache, no need to hit it again.
;; this allows partially completed preheat jobs to resume.
(define uncached-paths (filter
(λ(path)
;; #t = not cached; #f = already cached
;; seems like it would be slow to load cache.rktd but it's not.
(define-values (_ private-cache-dir) (make-cache-dirs path))
(define cache-db-file (build-path private-cache-dir "cache.rktd"))
(cond
[(not (file-exists? cache-db-file)) #t]
[else (define cache-db (file->value cache-db-file))
(not (hash-has-key? cache-db (paths->key path)))])) paths-that-should-be-cached))
;; compile a path inside a place (= parallel processing)
(define (path-into-place path)
(message (format "caching: ~a" (find-relative-path starting-dir path)))
(define p (place ch
(define path (place-channel-get ch))
(define-values (path-dir path-name _) (split-path path))
(message (format "compiling: ~a" path-name))
;; use #f to signal compile error. Otherwise allow errors to pass.
(define result (with-handlers ([exn:fail? (λ _ (message "~a failed" path-name) #f)])
(path->hash path)))
(place-channel-put ch result)))
(place-channel-put p path)
p)
;; compile the paths in groups, so they can be incrementally saved.
;; that way, if there's a failure, the progress is preserved.
;; but the slowest file in a group will prevent further progress.
(for ([path-group (in-list (slice-at uncached-paths max-places))])
(define path-places (map path-into-place path-group))
(for ([path (in-list path-group)]
[ppl (in-list path-places)])
(define result (place-channel-get ppl))
(when result ; #f is used to signal compile error
(cache-ref! (paths->key path) (λ _ result))))))
(define (paths->key source-path [template-path #f])
;; key is list of file + mod-time pairs, use #f for missing
(define path-strings (append (list source-path)
(append (list template-path) ; is either path or #f
(->list (get-directory-require-files source-path))))) ; is either list of files or (list #f)
;; can't use relative paths for cache keys because source files include `here-path` which is absolute.
;; problem is that cache could appear valid on another filesystem (based on relative pathnames & mod dates)
;; but would actually be invalid (because the `here-path` names are wrong).
(define path+mod-time-pairs
(map (λ(ps) (and ps (let ([cp (->complete-path ps)])
(cons (path->string cp) (file-or-directory-modify-seconds cp))))) path-strings))
path+mod-time-pairs)
(define (key->source-path key)
(car (car key)))
(define (path->hash path)
;; new namespace forces dynamic-require to re-instantiate 'path'
;; otherwise it gets cached in current namespace.
(define drfs (get-directory-require-files path))
(for-each managed-compile-zo (or drfs null))
(define-values (path-dir path-name _) (split-path path))
(apply hash
(let ([doc-key (world:current-main-export)]
[meta-key (world:current-meta-export)])
(parameterize ([current-namespace (make-base-namespace)]
[current-directory path-dir])
;; I monkeyed around with using the metas submodule to pull out the metas (for speed)
;; but in practice most files get their doc requested too.
;; so it's just simpler to get both at once and be done with it.
;; the savings of avoiding two cache fetches at the outset outweighs
;; the benefit of not reloading doc when you just need metas.
(list doc-key (dynamic-require path doc-key) meta-key (dynamic-require path meta-key))))))
(define (my-make-directory* dir)
(let-values ([(base name dir?) (split-path dir)])
(when (and (path? base) (not (directory-exists? base)))
(my-make-directory* base))
(unless (directory-exists? dir)
(with-handlers ([exn:fail:filesystem:exists? void])
(make-directory dir)))))
(define (make-cache-dirs path)
(define-values (path-dir path-filename _) (split-path path))
(define cache-dir (build-path path-dir (world:current-cache-dir-name)))
(define private-cache-dir (build-path cache-dir "private"))
(my-make-directory* private-cache-dir) ; will also make cache-dir, if needed
(values cache-dir private-cache-dir))
(define ram-cache (make-hash))
(define (cache-ref! key path-hash-thunk)
(define path (key->source-path key))
(define-values (cache-dir private-cache-dir) (make-cache-dirs path))
(define-values (path-dir path-filename _) (split-path path))
(define dest-file (build-path cache-dir (format "~a.rktd" path-filename)))
(cache-file dest-file
#:exists-ok? #t
key
private-cache-dir
(λ _
(write-to-file (path-hash-thunk) dest-file #:exists 'replace))
#:max-cache-size (world:current-compile-cache-max-size))
(file->value dest-file))
(define (cached-require path-string subkey)
(define path (with-handlers ([exn:fail? (λ _ (error 'cached-require (format "~a is not a valid path" path-string)))])
(->complete-path path-string)))
(when (not (file-exists? path))
(error (format "cached-require: ~a does not exist" path)))
(cond
[(world:current-compile-cache-active)
(define key (paths->key path))
(hash-ref (hash-ref! ram-cache key (λ _
(cache-ref! key (λ _ (path->hash path))))) subkey)]
[else (parameterize ([current-namespace (make-base-namespace)])
(dynamic-require path subkey))]))