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compare: cbaines:39ae5177f2527169721d7d895e2953021e136bf4
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cbaines:pages
cbaines:actions-test

3 commits
338d08081e ... 39ae5177f2

Author SHA1 Message Date
Christopher Baines
39ae5177f2 Add spawn-fiber/knots
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Details 
Which is like spawn-fiber, but uses knots exception handling.
 2026-01-09 15:44:04 +00:00
Christopher Baines
991a5f6961 Make print-backtrace-and-exception/knots more reliable 
Catch failures in the Guile code for printing backtraces, and print
the partial backtrace, plus the backtrace of the exception that
happened.
 2026-01-09 15:31:54 +00:00
Christopher Baines
4642f7c7d2 Fix some issues handling head requests 
Rather than raising an exception when there's a body provided, use the
body as normal to inform the headers, as this is useful, and just
don't write the body to the client.
 2026-01-09 15:14:47 +00:00
3 changed files with 229 additions and 109 deletions
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152
knots.scm
View file

@ -2,6 +2,7 @@
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (ice-9 suspendable-ports)
#:use-module (fibers)
#:use-module (fibers conditions)
#:use-module (system repl debug)
#:export (call-with-default-io-waiters
@ -15,7 +16,9 @@
knots-exception?
knots-exception-stack
print-backtrace-and-exception/knots))
print-backtrace-and-exception/knots
spawn-fiber/knots))
(define (call-with-default-io-waiters thunk)
(parameterize
@ -67,6 +70,58 @@
(define* (print-backtrace-and-exception/knots
exn
#:key (port (current-error-port)))
(define (get-string port stack)
(define stack-len
(stack-length stack))
(let ((knots-stacks
(map knots-exception-stack
(filter knots-exception?
(simple-exceptions exn)))))
(let* ((stack-vec
(stack->vector stack))
(stack-vec-length
(vector-length stack-vec)))
(print-frames (list->vector
(drop
(vector->list stack-vec)
(if (< stack-vec-length 5)
0
4)))
port
#:count (stack-length stack)))
(for-each
(lambda (stack)
(let* ((stack-vec
(stack->vector stack))
(stack-vec-length
(vector-length stack-vec)))
(print-frames (list->vector
(drop
(vector->list stack-vec)
(if (< stack-vec-length 4)
0
3)))
port
#:count (stack-length stack))))
knots-stacks)
(print-exception
port
(if (null? knots-stacks)
(stack-ref stack
(if (< stack-len 4)
stack-len
4))
(let* ((stack (last knots-stacks))
(stack-len (stack-length stack)))
(stack-ref stack
(if (< stack-len 3)
stack-len
3))))
'%exception
(list exn))))
(let* ((stack
(match (fluid-ref %stacks)
((stack-tag . prompt-tag)
@ -75,56 +130,53 @@
0 (and prompt-tag 1)))
(_
(make-stack #t))))
(stack-len
(stack-length stack))
(string-port
(open-output-string))
(error-string
(call-with-output-string
(lambda (port)
(let ((knots-stacks
(map knots-exception-stack
(filter knots-exception?
(simple-exceptions exn)))))
(with-exception-handler
(lambda (exn)
(display (get-output-string string-port)
port)
(close-output-port string-port)
(display "\n\n" port)
(let* ((stack-vec
(stack->vector stack))
(stack-vec-length
(vector-length stack-vec)))
(print-frames (list->vector
(drop
(vector->list stack-vec)
(if (< stack-vec-length 5)
0
4)))
port
#:count (stack-length stack)))
(for-each
(lambda (stack)
(let* ((stack-vec
(stack->vector stack))
(stack-vec-length
(vector-length stack-vec)))
(print-frames (list->vector
(drop
(vector->list stack-vec)
(if (< stack-vec-length 4)
0
3)))
port
#:count (stack-length stack))))
knots-stacks)
(print-exception
(backtrace port)
(simple-format
port
(if (null? knots-stacks)
(stack-ref stack
(if (< stack-len 4)
stack-len
4))
(let* ((stack (last knots-stacks))
(stack-len (stack-length stack)))
(stack-ref stack
(if (< stack-len 3)
stack-len
3))))
'%exception
(list exn)))))))
"\nexception in print-backtrace-and-exception/knots: ~A\n"
exn)
(raise-exception exn))
(lambda ()
(get-string string-port stack)
(let ((str (get-output-string string-port)))
(close-output-port string-port)
str)))))
(display error-string port)))
(define* (spawn-fiber/knots thunk #:optional scheduler #:key parallel?)
(spawn-fiber
(lambda ()
(with-exception-handler
(lambda (exn)
(display "Uncaught exception in task:\n"
(current-error-port))
(print-backtrace-and-exception/knots exn))
(lambda ()
(with-exception-handler
(lambda (exn)
(let ((stack
(match (fluid-ref %stacks)
((stack-tag . prompt-tag)
(make-stack #t
0 prompt-tag
0 (and prompt-tag 1)))
(_
(make-stack #t)))))
(raise-exception
(make-exception
exn
(make-knots-exception stack)))))
thunk))
#:unwind? #t))
scheduler
#:parallel? parallel?))

121
knots/web-server.scm
View file

@ -228,8 +228,6 @@ on the procedure being called at any particular time."
(adapt-response-version response
(request-version request))
body))
((not body)
(values response #vu8()))
((string? body)
(let* ((type (response-content-type response
'(text/plain)))
@ -243,16 +241,15 @@ on the procedure being called at any particular time."
`(,@type (charset . ,charset))))
(string->bytevector body charset))))
((not (or (bytevector? body)
(procedure? body)))
(procedure? body)
(eq? #f body)))
(raise-exception
(make-exception-with-irritants
(list (make-exception-with-message
"unexpected body type")
body))))
((and (response-must-not-include-body? response)
body
;; FIXME make this stricter: even an empty body should be prohibited.
(not (zero? (bytevector-length body))))
body)
(raise-exception
(make-exception-with-irritants
(list (make-exception-with-message
@ -262,25 +259,24 @@ on the procedure being called at any particular time."
;; check length; assert type; add other required fields?
(values (response-maybe-add-connection-header-value
request
(if (procedure? body)
(if (response-content-length response)
response
(extend-response response
'transfer-encoding
'((chunked))))
(let ((rlen (response-content-length response))
(blen (bytevector-length body)))
(cond
(rlen (if (= rlen blen)
response
(error "bad content-length" rlen blen)))
(else (extend-response response 'content-length blen))))))
(cond
((procedure? body)
(if (response-content-length response)
response
(extend-response response
'transfer-encoding
'((chunked)))))
((bytevector? body)
(let ((rlen (response-content-length response))
(blen (bytevector-length body)))
(cond
(rlen (if (= rlen blen)
response
(error "bad content-length" rlen blen)))
(else (extend-response response 'content-length blen)))))
(else response)))
(if (eq? (request-method request) 'HEAD)
(raise-exception
(make-exception-with-irritants
(list (make-exception-with-message
"unexpected body type")
body)))
#f
body)))))
(define (with-stack-and-prompt thunk)
@ -405,41 +401,48 @@ on the procedure being called at any particular time."
(let ((response-start-time
(get-internal-real-time))
(body-written?
(if (procedure? body)
(let* ((type (response-content-type response
'(text/plain)))
(declared-charset (assq-ref (cdr type) 'charset))
(charset (or declared-charset "ISO-8859-1"))
(body-port
(if (response-content-length response)
client
(make-chunked-output-port/knots
client
#:keep-alive? #t
#:buffering
(- buffer-size
(chunked-output-port-overhead-bytes
buffer-size))))))
(set-port-encoding! body-port charset)
(let ((body-written?
(with-exception-handler
(lambda (exn)
#f)
(lambda ()
(with-exception-handler
(lambda (exn)
(print-backtrace-and-exception/knots exn)
(raise-exception exn))
(lambda ()
(body body-port)))
#t)
#:unwind? #t)))
(unless (response-content-length response)
(close-port body-port))
body-written?))
(begin
(put-bytevector client body)
#t))))
(cond
((and (procedure? body)
(not
(eq? (request-method request)
'HEAD)))
(let* ((type (response-content-type response
'(text/plain)))
(declared-charset (assq-ref (cdr type) 'charset))
(charset (or declared-charset "ISO-8859-1"))
(body-port
(if (response-content-length response)
client
(make-chunked-output-port/knots
client
#:keep-alive? #t
#:buffering
(- buffer-size
(chunked-output-port-overhead-bytes
buffer-size))))))
(set-port-encoding! body-port charset)
(let ((body-written?
(with-exception-handler
(lambda (exn)
#f)
(lambda ()
(with-exception-handler
(lambda (exn)
(print-backtrace-and-exception/knots exn)
(raise-exception exn))
(lambda ()
(body body-port)))
#t)
#:unwind? #t)))
(unless (response-content-length response)
(close-port body-port))
body-written?)))
((bytevector? body)
(put-bytevector client body)
#t)
(else
;; No body to write
#t))))
(if body-written?
(begin
(force-output client)

65
tests/web-server.scm
View file

@ -1,5 +1,6 @@
(use-modules (srfi srfi-71)
(rnrs bytevectors)
(ice-9 match)
(ice-9 binary-ports)
(ice-9 textual-ports)
(tests)
@ -233,4 +234,68 @@
(assert-equal (get-message exception-handled-sucecssfully-channel)
#t))))
(run-fibers-for-tests
(lambda ()
(let* ((web-server
(run-knots-web-server
(lambda (request)
(match (split-and-decode-uri-path
(uri-path (request-uri request)))
(("head-no-body")
(values '((content-type . (text/plain)))
#f))
(("head-empty-body")
(values '((content-type . (text/plain)))
""))
(("head-no-body-with-content-length")
(values '((content-type . (text/plain))
(content-length . 10))
#f))
(("head-with-body")
(values '((content-type . (text/plain)))
"foo"))
(("head-procedure-body")
(values '((content-type . (text/plain)))
(lambda _
(error "should not be run"))))
(("head-procedure-body-with-content-length")
(values '((content-type . (text/plain))
(content-length . 10))
(lambda _
(error "should not be run"))))))
#:port 0)) ;; Bind to any port
(port
(web-server-port web-server)))
(define* (head path)
(let ((uri
(build-uri 'http #:host "127.0.0.1" #:port port
#:path path)))
(http-head
uri
#:port (non-blocking-open-socket-for-uri uri))))
(let ((response
(head "/head-no-body")))
(assert-equal 200 (response-code response)))
(let ((response
(head "/head-empty-body")))
(assert-equal 200 (response-code response))
(assert-equal 0 (response-content-length response)))
(let ((response
(head "/head-no-body-with-content-length")))
(assert-equal 200 (response-code response))
(assert-equal 10 (response-content-length response)))
(let ((response
(head "/head-with-body")))
(assert-equal 200 (response-code response))
(assert-equal 3 (response-content-length response)))
(let ((response
(head "/head-procedure-body")))
(assert-equal 200 (response-code response)))
(let ((response
(head "/head-procedure-body-with-content-length")))
(assert-equal 200 (response-code response))
(assert-equal 10 (response-content-length response))))))
(display "web-server test finished successfully\n")