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pollen/cache.rkt

98 lines
4.6 KiB
Racket

#lang racket/base
(require racket/path racket/file file/cache sugar/coerce "project.rkt" "world.rkt" "rerequire.rkt" "cache-ns.rkt" "debug.rkt")
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;; 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 cached-require paths->key)
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(define cache-dir
(build-path (world:current-project-root) (world:current-cache-dir-name)))
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(define (reset-cache)
(cache-remove #f cache-dir))
(define (paths->key source-path [template-path #f] #:subkey [subkey #f])
;; key is list of file + mod-time pairs, use #f for missing
(define path-strings (append (list source-path)
(if (eq? subkey (world:current-meta-export))
null ; metas only depend on source-path
(append (list template-path) ; is either path or #f
(->list (get-directory-require-files source-path))))))
;; 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))
(cons subkey path+mod-time-pairs))
(define (key->source-path key)
(car (cadr key)))
(define (update-directory-requires source-path)
(define directory-require-files (get-directory-require-files source-path))
(and directory-require-files (map dynamic-rerequire directory-require-files))
(void))
(define (path->hash path subkey)
;; new namespace forces dynamic-require to re-instantiate 'path'
;; otherwise it gets cached in current namespace.
(define kvs
(let ([meta-key (world:current-meta-export)])
(parameterize ([current-namespace (make-base-namespace)])
(if (eq? subkey meta-key)
(list meta-key (dynamic-require (list 'submod path 'metas) meta-key))
(list subkey (dynamic-require path subkey) meta-key (dynamic-require path meta-key))))))
(apply hash kvs))
;; include this from 6.2 for compatibility back to 6.0 (formerly `make-parent-directory*`)
(define (make-parent-directory p)
(unless (path-string? p)
(raise-argument-error 'make-parent-directory "path-string?" p))
(define (make-directory* dir)
(let-values ([(base name dir?) (split-path dir)])
(when (and (path? base) (not (directory-exists? base)))
(make-directory* base))
(unless (directory-exists? dir)
(with-handlers ([exn:fail:filesystem:exists? void])
(make-directory dir)))))
(define-values (base name dir?) (split-path p))
(when (path? base)
(make-directory* base)))
(define ram-cache (make-hash))
(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 #:subkey subkey))
;; use multiple pickup files to avoid locking issues.
;; pickup-file hierarchy just mirrors the project hierarchy.
(define dest-file (build-path cache-dir (path->string (find-relative-path (world:current-project-root) (string->path (format "~a#~a.rktd" (key->source-path key) subkey))))))
(make-parent-directory dest-file)
(hash-ref (hash-ref! ram-cache key (λ _
(cache-file dest-file
#:exists-ok? #t
key
cache-dir
(λ _
(message (format "caching: ~a from ~a" subkey (find-relative-path (current-directory) path)))
(write-to-file (path->hash path subkey) dest-file #:exists 'replace))
#:max-cache-size (world:current-compile-cache-max-size))
(file->value dest-file))) subkey)]
[else (parameterize ([current-namespace (make-base-namespace)])
(dynamic-require path subkey))]))