X-Git-Url: https://jxself.org/git/?p=8sync.git;a=blobdiff_plain;f=eightsync%2Fagenda.scm;h=386752695c41968c96a81df2d13e86983dae2220;hp=1bfc0a3a941ac148d4214b014b8e1878d23c5e85;hb=21857a053fd1ba6af66d95a2874193aeef20c4a2;hpb=555743be477968b12562c5b6c92000ecfe9556f2 diff --git a/eightsync/agenda.scm b/eightsync/agenda.scm index 1bfc0a3..3867526 100644 --- a/eightsync/agenda.scm +++ b/eightsync/agenda.scm @@ -50,7 +50,7 @@ schedule-segments-split schedule-extract-until! add-segments-contents-to-queue! - %sync 8sync + %8sync make-run-request run-request? @@ -64,8 +64,9 @@ run-it wrap wrap-apply run run-at run-delay %port-request %run %run-at %run-delay - 8port-request 8run 8run-at 8run-delay + print-error-and-continue + %current-agenda start-agenda agenda-run-once)) @@ -93,7 +94,7 @@ (define-immutable-record-type (make-agenda-intern queue prompt-tag read-port-map write-port-map except-port-map - schedule time) + schedule time catch-handler pre-unwind-handler) agenda? (queue agenda-queue) (prompt-tag agenda-prompt-tag) @@ -101,7 +102,9 @@ (write-port-map agenda-write-port-map) (except-port-map agenda-except-port-map) (schedule agenda-schedule) - (time agenda-time)) + (time agenda-time) + (catch-handler agenda-catch-handler) + (pre-unwind-handler agenda-pre-unwind-handler)) (define (make-async-prompt-tag) "Make an async prompt tag for an agenda. @@ -116,12 +119,15 @@ Generally done automatically for the user through (make-agenda)." (write-port-map (make-hash-table)) (except-port-map (make-hash-table)) (schedule (make-schedule)) - (time (gettimeofday))) + (time (gettimeofday)) + (catch-handler #f) + (pre-unwind-handler #f)) ;; TODO: document arguments "Make a fresh agenda." (make-agenda-intern queue prompt read-port-map write-port-map except-port-map - schedule time)) + schedule time + catch-handler pre-unwind-handler)) (define (current-agenda-prompt) "Get the prompt for the current agenda; signal an error if there isn't one." @@ -429,6 +435,8 @@ Will produce (0 . 0) instead of a negative number, if needed." ;;; ================================= ;; The future's in futures +;; @@: ... kinda conflicts with ice-9 futures. Should we rename +;; to "futurists"? :) (define (make-future call-first on-success on-fail on-error) ;; TODO: add error stuff here @@ -456,31 +464,19 @@ Will produce (0 . 0) instead of a negative number, if needed." (make-future call-first on-success on-fail on-error) when)) -(define-syntax-rule (%sync async-request) +(define-syntax-rule (%8sync async-request) "Run BODY asynchronously at a prompt, passing args to make-future. -Pronounced `eight-sync' despite the spelling. - -%sync was chosen because (async) was already taken and could lead to -errors, and this version of asynchronous code uses a prompt, so the `a' -character becomes a `%' prompt! :) - -The % and 8 characters kind of look similar... hence this library's -name! (That, and the pun 'eight-synchronous' programming.) -There are 8sync aliases if you prefer that name." +Runs things asynchronously (8synchronously?)" (abort-to-prompt (current-agenda-prompt) async-request)) -(define-syntax-rule (8sync args ...) - "Alias for %sync" - (%sync args ...)) - ;; Async port request and run-request meta-requests (define (make-async-request proc) "Wrap PROC in an async-request The purpose of this is to make sure that users don't accidentally -return the wrong thing via (8sync) and trip themselves up." +return the wrong thing via (%8sync) and trip themselves up." (cons '*async-request* proc)) (define (setup-async-request resume-kont async-request) @@ -491,7 +487,7 @@ return the wrong thing via (8sync) and trip themselves up." ;; TODO: deliver more helpful errors depending on what the user ;; returned (_ (throw 'invalid-async-request - "Invalid request passed back via an (%sync) procedure." + "Invalid request passed back via an (%8sync) procedure." async-request)))) (define-syntax-rule (%run body ...) @@ -523,12 +519,6 @@ return the wrong thing via (8sync) and trip themselves up." (lambda () body ...))))) -;; Aliases -(define-syntax-rule (8run args ...) (%run args ...)) -(define-syntax-rule (8run-at args ...) (%run-at args ...)) -(define-syntax-rule (8run-delay args ...) (%run-delay args ...)) -(define-syntax-rule (8port-request args ...) (%port-request args ...)) - ;;; Execution of agenda, and current agenda @@ -661,6 +651,25 @@ return the wrong thing via (8sync) and trip themselves up." (agenda-queue agenda)) (loop agenda)))))) +(define (print-error-and-continue . args) + "Frequently used as pre-unwind-handler for agenda" + (format (current-error-port) "\n*** Caught exception with arguments: ~s ***\n" + args) + (display-backtrace (make-stack #t 1 0) + (current-error-port)) + (newline (current-error-port))) + +(define-syntax-rule (maybe-catch-all (catch-handler pre-unwind-handler) + body ...) + (if (or catch-handler pre-unwind-handler) + (catch + #t + (lambda () + body ...) + (or catch-handler (lambda _ #f)) + (or pre-unwind-handler (lambda _ #f))) + (begin body ...))) + (define (agenda-run-once agenda) "Run once through the agenda, and produce a new agenda based on the results" @@ -669,7 +678,10 @@ based on the results" (agenda-prompt-tag agenda) (lambda () (parameterize ((%current-agenda agenda)) - (proc))) + (maybe-catch-all + ((agenda-catch-handler agenda) + (agenda-pre-unwind-handler agenda)) + (proc)))) (lambda (kont async-request) (setup-async-request kont async-request))))