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@ -1,14 +1,44 @@
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#lang racket/base
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(require "file-utils.rkt" racket/file "cache-utils.rkt" "debug.rkt" racket/path racket/place sugar/list)
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(require racket/file
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racket/path
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racket/place
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racket/list
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sugar/list
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"file-utils.rkt"
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"cache-utils.rkt"
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"debug.rkt")
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(provide preheat-cache)
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(define (path-cached? path)
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;; #true = already cached; #false = not cached
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;; seems like it would be slow to load cache.rktd but it's not.
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(define-values (_ private-cache-dir) (make-cache-dirs path))
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(define cache-db-file (build-path private-cache-dir "cache.rktd"))
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(or (file-exists? cache-db-file)
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(hash-has-key? (file->value cache-db-file) (paths->key path))))
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;; compile a path inside a place (= parallel processing)
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(define (path-into-place starting-dir path)
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(message (format "caching: ~a" (find-relative-path starting-dir path)))
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(define p
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(place ch
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(define path (place-channel-get ch))
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(define-values (_ path-name __) (split-path path))
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(message (format "compiling: ~a" path))
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;; use #false to signal compile error. Otherwise allow errors to pass.
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(define result
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(with-handlers ([exn:fail? (λ (e) (message (format "compile failed: ~a" path-name)) #false)])
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(path->hash path)))
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(place-channel-put ch result)))
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(place-channel-put p path)
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p)
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(define (preheat-cache starting-dir)
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(unless (and (path-string? starting-dir) (directory-exists? starting-dir))
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(error 'preheat-cache (format "~a is not a directory" starting-dir)))
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(raise-argument-error 'preheat-cache "directory" starting-dir))
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(define max-places (processor-count)) ; number of parallel processes to spawn at a time
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(define paths-that-should-be-cached (for/list ([path (in-directory starting-dir)]
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(define paths-that-should-be-cached
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(for/list ([path (in-directory starting-dir)]
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#:when (for/or ([proc (in-list (list preproc-source?
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markup-source?
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markdown-source?
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@ -18,38 +48,15 @@
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;; if a file is already in the cache, no need to hit it again.
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;; this allows partially completed preheat jobs to resume.
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(define uncached-paths (filter
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(λ (path)
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;; #t = not cached; #f = already cached
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;; seems like it would be slow to load cache.rktd but it's not.
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(define-values (_ private-cache-dir) (make-cache-dirs path))
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(define cache-db-file (build-path private-cache-dir "cache.rktd"))
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(cond
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[(not (file-exists? cache-db-file)) #t]
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[else (define cache-db (file->value cache-db-file))
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(not (hash-has-key? cache-db (paths->key path)))])) paths-that-should-be-cached))
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;; compile a path inside a place (= parallel processing)
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(define (path-into-place path)
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(message (format "caching: ~a" (find-relative-path starting-dir path)))
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(define p (place ch
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(define path (place-channel-get ch))
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(define-values (path-dir path-name _) (split-path path))
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(message (format "compiling: ~a" path))
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;; use #f to signal compile error. Otherwise allow errors to pass.
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(define result (with-handlers ([exn:fail? (λ _ (message (format "compile failed: ~a" path-name)) #f)])
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(path->hash path)))
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(place-channel-put ch result)))
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(place-channel-put p path)
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p)
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(define uncached-paths (filter-not path-cached? paths-that-should-be-cached))
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;; compile the paths in groups, so they can be incrementally saved.
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;; that way, if there's a failure, the progress is preserved.
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;; but the slowest file in a group will prevent further progress.
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(for ([path-group (in-list (slice-at uncached-paths max-places))])
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(define path-places (map path-into-place path-group))
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(define path-places (map (λ (pg) (path-into-place starting-dir pg)) path-group))
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(for ([path (in-list path-group)]
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[ppl (in-list path-places)])
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(define result (place-channel-get ppl))
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(when result ; #f is used to signal compile error
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(cache-ref! (paths->key path) (λ _ result))))))
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(when result ; #false is used to signal compile error
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(cache-ref! (paths->key path) (λ () result))))))
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