Crude steps toward reloadable Syndicate modules
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#lang syndicate/actor
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;; Crude steps toward reloadable Syndicate modules
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(provide (except-out (struct-out reload-pending) reload-pending)
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(rename-out [reload-pending <reload-pending>])
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(rename-out [make-reload-pending reload-pending])
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stop-when-reloaded
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spawn-reloader
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spawn-reloader*)
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(define-logger syndicate/reload)
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(require (for-syntax racket/base))
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(require racket/rerequire)
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(require/activate syndicate/drivers/filesystem)
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(struct reload-pending (filename) #:prefab) ;; ASSERTION
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(define-syntax (make-reload-pending stx)
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(quasisyntax/loc stx
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(reload-pending '#,(path->string (syntax-source stx)))))
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(define-syntax (stop-when-reloaded stx)
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(syntax-case stx ()
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[(_ body ...)
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(quasisyntax/loc stx
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(stop-when (asserted (reload-pending '#,(path->string (syntax-source stx))))
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body ...))]))
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(define-syntax-rule (spawn-reloader module-path)
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(spawn-reloader* 'module-path))
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(define (spawn-reloader* module-path)
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(define mpi (module-path-index-join module-path #f))
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(define rpath (module-path-index-resolve mpi))
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(define path (let ((p (resolved-module-path-name rpath)))
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(if (pair? p) (car p) p)))
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(if (path? path)
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(spawn-reloader** module-path (path->string path))
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(log-syndicate/reload-error "Could not process module-path ~v" module-path)))
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(define counter
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(let ((count 0))
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(lambda (_pathstr)
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(begin0 count
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(set! count (+ count 1))))))
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(define (spawn-reloader** module-path pathstr)
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(actor #:name (list 'reloader pathstr)
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(field [reloading? #f])
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(define (reload!)
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(when (not (reloading?))
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(reloading? #t)
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(react (field [obstacles-cleared? #f])
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(define/query-value obstacles-exist? #f (observe (reload-pending pathstr)) #t
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#:on-add (log-syndicate/reload-info "waiting to reload ~v" pathstr)
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#:on-remove (obstacles-cleared? #t))
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(assert #:when (obstacles-exist?) (reload-pending pathstr))
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(on-start (flush!)
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(obstacles-cleared? (not (obstacles-exist?))))
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(stop-when (rising-edge (obstacles-cleared?))
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(flush!) ;; Wait one turn for effects of newly-cleared obstacles
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(log-syndicate/reload-info "(re)loading ~v" pathstr)
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(dynamic-rerequire module-path)
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(schedule-actions!
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((dynamic-require `(submod ,module-path syndicate-main)
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'activate!)))
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(reloading? #f)))))
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(field [previous-version #f])
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(define/query-value latest-version #f (file-content pathstr counter $p) p)
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(begin/dataflow
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(when (not (equal? (latest-version) (previous-version)))
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(if (latest-version)
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(reload!)
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(log-syndicate/reload-warning "Module ~v does not exist" pathstr))
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(previous-version (latest-version))))))
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