From 2f39c58d6ca72cd869ba69e03d639f36d497e9a8 Mon Sep 17 00:00:00 2001 From: Christopher Baines Date: Tue, 19 Nov 2024 18:43:43 +0000 Subject: [PATCH] Initial commit --- .gitignore | 19 ++ COPYING | 674 +++++++++++++++++++++++++++++++++++++++ Makefile.am | 17 + README | 4 + bootstrap | 3 + configure.ac | 19 ++ guile.am | 21 ++ guix-dev.scm | 50 +++ knots.scm | 21 ++ knots/non-blocking.scm | 63 ++++ knots/parallelism.scm | 197 ++++++++++++ knots/promise.scm | 78 +++++ knots/queue.scm | 47 +++ knots/resource-pool.scm | 485 ++++++++++++++++++++++++++++ knots/timeout.scm | 200 ++++++++++++ knots/web-server.scm | 263 +++++++++++++++ knots/worker-threads.scm | 577 +++++++++++++++++++++++++++++++++ pre-inst-env.in | 13 + tests.scm | 28 ++ tests/non-blocking.scm | 31 ++ tests/parallelism.scm | 15 + tests/promise.scm | 20 ++ tests/queue.scm | 22 ++ tests/resource-pool.scm | 18 ++ tests/timeout.scm | 22 ++ tests/web-server.scm | 30 ++ tests/worker-threads.scm | 32 ++ 27 files changed, 2969 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 Makefile.am create mode 100644 README create mode 100755 bootstrap create mode 100644 configure.ac create mode 100644 guile.am create mode 100644 guix-dev.scm create mode 100644 knots.scm create mode 100644 knots/non-blocking.scm create mode 100644 knots/parallelism.scm create mode 100644 knots/promise.scm create mode 100644 knots/queue.scm create mode 100644 knots/resource-pool.scm create mode 100644 knots/timeout.scm create mode 100644 knots/web-server.scm create mode 100644 knots/worker-threads.scm create mode 100644 pre-inst-env.in create mode 100644 tests.scm create mode 100644 tests/non-blocking.scm create mode 100644 tests/parallelism.scm create mode 100644 tests/promise.scm create mode 100644 tests/queue.scm create mode 100644 tests/resource-pool.scm create mode 100644 tests/timeout.scm create mode 100644 tests/web-server.scm create mode 100644 tests/worker-threads.scm diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..10520ac --- /dev/null +++ b/.gitignore @@ -0,0 +1,19 @@ +*.go +Makefile.in +Makefile +aclocal.m4 +autom4te.cache +config.log +config.status +configure + +build-aux/install-sh +build-aux/missing + +*.log +tests/*.log +tests/*.trs + +pre-inst-env + +.local.envrc diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..5643873 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,17 @@ +include guile.am + +SOURCES = \ + knots.scm \ + knots/non-blocking.scm \ + knots/parallelism.scm \ + knots/promise.scm \ + knots/queue.scm \ + knots/resource-pool.scm \ + knots/timeout.scm \ + knots/web-server.scm \ + knots/worker-threads.scm + +EXTRA_DIST = \ + README \ + bootstrap \ + pre-inst-env.in diff --git a/README b/README new file mode 100644 index 0000000..e593a79 --- /dev/null +++ b/README @@ -0,0 +1,4 @@ +-*- mode: org -*- + +This Guile library provides useful patterns and functionality to use +Guile Fibers. diff --git a/bootstrap b/bootstrap new file mode 100755 index 0000000..5af6611 --- /dev/null +++ b/bootstrap @@ -0,0 +1,3 @@ +#! /bin/sh + +autoreconf --verbose --install --force diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..fe1cb2f --- /dev/null +++ b/configure.ac @@ -0,0 +1,19 @@ +AC_INIT([guile-knots], [0.1]) +AC_CONFIG_AUX_DIR([build-aux]) +AM_INIT_AUTOMAKE([-Wall -Werror foreign]) + +GUILE_PKG([3.0]) +GUILE_PROGS +if test "x$GUILD" = "x"; then + AC_MSG_ERROR(['guild' binary not found; please check your guile 3 installation.]) +fi + +if test "$cross_compiling" != no; then + GUILE_TARGET="--target=$host_alias" + AC_SUBST([GUILE_TARGET]) +fi + +AC_CONFIG_FILES([Makefile]) +AC_CONFIG_FILES([pre-inst-env], [chmod +x pre-inst-env]) + +AC_OUTPUT diff --git a/guile.am b/guile.am new file mode 100644 index 0000000..743bdea --- /dev/null +++ b/guile.am @@ -0,0 +1,21 @@ +moddir=$(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION) +godir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/site-ccache + +GOBJECTS = $(SOURCES:%.scm=%.go) + +nobase_dist_mod_DATA = $(SOURCES) $(NOCOMP_SOURCES) +nobase_go_DATA = $(GOBJECTS) + +# Make sure source files are installed first, so that the mtime of +# installed compiled files is greater than that of installed source +# files. See +# +# for details. +guile_install_go_files = install-nobase_goDATA +$(guile_install_go_files): install-nobase_dist_modDATA + +CLEANFILES = $(GOBJECTS) +GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat +SUFFIXES = .scm .go +.scm.go: + $(AM_V_GEN)$(top_builddir)/pre-inst-env $(GUILD) compile $(GUILE_TARGET) $(GUILE_WARNINGS) -o "$@" "$<" diff --git a/guix-dev.scm b/guix-dev.scm new file mode 100644 index 0000000..6b51e8a --- /dev/null +++ b/guix-dev.scm @@ -0,0 +1,50 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +;;; Run the following command to enter a development environment for +;;; Guile Knots: +;;; +;;; $ guix environment -l guix-dev.scm + +(use-modules ((guix licenses) #:prefix license:) + (guix packages) + (guix build-system gnu) + (gnu packages) + (gnu packages autotools) + (gnu packages guile) + (gnu packages guile-xyz) + (gnu packages pkg-config) + (srfi srfi-1)) + +(package + (name "guile-knots") + (version "0.0.0") + (source #f) + (build-system gnu-build-system) + (inputs + (list guile-3.0 + guile-fibers)) + (native-inputs + (list autoconf + automake + pkg-config)) + (synopsis "TODO") + (description "TODO") + (home-page "TODO") + (license license:gpl3+)) diff --git a/knots.scm b/knots.scm new file mode 100644 index 0000000..d545770 --- /dev/null +++ b/knots.scm @@ -0,0 +1,21 @@ +(define-module (knots) + #:use-module (ice-9 suspendable-ports) + #:export (call-with-default-io-waiters + + wait-when-system-clock-behind)) + +(define (call-with-default-io-waiters thunk) + (parameterize + ((current-read-waiter (@@ (ice-9 suspendable-ports) + default-read-waiter)) + (current-write-waiter (@@ (ice-9 suspendable-ports) + default-write-waiter))) + (thunk))) + +(define (wait-when-system-clock-behind) + (let ((start-of-the-year-2000 946684800)) + (while (< (current-time) + start-of-the-year-2000) + (simple-format (current-error-port) + "warning: system clock potentially behind, waiting\n") + (sleep 20)))) diff --git a/knots/non-blocking.scm b/knots/non-blocking.scm new file mode 100644 index 0000000..5914143 --- /dev/null +++ b/knots/non-blocking.scm @@ -0,0 +1,63 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots non-blocking) + #:use-module (web uri) + #:use-module (web client) + #:export (non-blocking-port + nonblocking-open-socket-for-uri)) + +(define (non-blocking-port port) + "Make PORT non-blocking and return it." + (let ((flags (fcntl port F_GETFL))) + (when (zero? (logand O_NONBLOCK flags)) + (fcntl port F_SETFL (logior O_NONBLOCK flags))) + port)) + +(define* (nonblocking-open-socket-for-uri uri + #:key (verify-certificate? #t)) + (define tls-wrap + (@@ (web client) tls-wrap)) + + (define https? + (eq? 'https (uri-scheme uri))) + + (define plain-uri + (if https? + (build-uri + 'http + #:userinfo (uri-userinfo uri) + #:host (uri-host uri) + #:port (or (uri-port uri) 443) + #:path (uri-path uri) + #:query (uri-query uri) + #:fragment (uri-fragment uri)) + uri)) + + (let ((s (open-socket-for-uri plain-uri))) + (if https? + (let ((port + (tls-wrap s (uri-host uri) + #:verify-certificate? verify-certificate?))) + ;; Guile/guile-gnutls don't handle the handshake happening on a non + ;; blocking socket, so change the behavior here. + (non-blocking-port s) + port) + (non-blocking-port s)))) + diff --git a/knots/parallelism.scm b/knots/parallelism.scm new file mode 100644 index 0000000..b5b03d5 --- /dev/null +++ b/knots/parallelism.scm @@ -0,0 +1,197 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots parallelism) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-71) + #:use-module (ice-9 match) + #:use-module (fibers) + #:use-module (fibers channels) + #:use-module (fibers operations) + #:export (fibers-batch-map + fibers-map + + fibers-map-with-progress + + fibers-batch-for-each + fibers-for-each + + fibers-parallel + fibers-let)) + +;; Like split-at, but don't care about the order of the resulting lists, and +;; don't error if the list is shorter than i elements +(define (split-at* lst i) + (let lp ((l lst) (n i) (acc '())) + (if (or (<= n 0) (null? l)) + (values (reverse! acc) l) + (lp (cdr l) (- n 1) (cons (car l) acc))))) + +;; As this can be called with lists with tens of thousands of items in them, +;; batch the +(define (get-batch batch-size lists) + (let ((split-lists + (map (lambda (lst) + (let ((batch rest (split-at* lst batch-size))) + (cons batch rest))) + lists))) + (values (map car split-lists) + (map cdr split-lists)))) + +(define (defer-to-parallel-fiber thunk) + (let ((reply (make-channel))) + (spawn-fiber + (lambda () + (with-exception-handler + (lambda (exn) + (put-message reply (cons 'exception exn))) + (lambda () + (call-with-values + (lambda () + (with-throw-handler #t + thunk + (lambda _ + (backtrace)))) + (lambda vals + (put-message reply vals)))) + #:unwind? #t)) + #:parallel? #t) + reply)) + +(define (fetch-result-of-defered-thunks . reply-channels) + (let ((responses (map get-message + reply-channels))) + (map + (match-lambda + (('exception . exn) + (raise-exception exn)) + (result + (apply values result))) + responses))) + +(define (fibers-batch-map proc batch-size . lists) + (let loop ((lists lists) + (result '())) + (let ((batch + rest + (get-batch batch-size lists))) + (if (any null? batch) + result + (let ((response-channels + (apply map + (lambda args + (defer-to-parallel-fiber + (lambda () + (apply proc args)))) + batch))) + (loop rest + (append! result + (apply fetch-result-of-defered-thunks + response-channels)))))))) + +(define (fibers-map proc . lists) + (apply fibers-batch-map proc 20 lists)) + +(define (fibers-batch-for-each proc batch-size . lists) + (let loop ((lists lists)) + (let ((batch + rest + (get-batch batch-size lists))) + (if (any null? batch) + *unspecified* + (let ((response-channels + (apply map + (lambda args + (defer-to-parallel-fiber + (lambda () + (apply proc args)))) + batch))) + (apply fetch-result-of-defered-thunks + response-channels) + (loop rest)))))) + +(define (fibers-for-each proc . lists) + (apply fibers-batch-for-each proc 20 lists)) + +(define-syntax fibers-parallel + (lambda (x) + (syntax-case x () + ((_ e0 ...) + (with-syntax (((tmp0 ...) (generate-temporaries (syntax (e0 ...))))) + #'(let ((tmp0 (defer-to-parallel-fiber + (lambda () + e0))) + ...) + (apply values (fetch-result-of-defered-thunks tmp0 ...)))))))) + +(define-syntax-rule (fibers-let ((v e) ...) b0 b1 ...) + (call-with-values + (lambda () (fibers-parallel e ...)) + (lambda (v ...) + b0 b1 ...))) + +(define* (fibers-map-with-progress proc lists #:key report) + (let loop ((channels-to-results + (apply map + (lambda args + (cons (defer-to-parallel-fiber + (lambda () + (apply proc args))) + #f)) + lists))) + (let ((active-channels + (filter-map car channels-to-results))) + (when report + (report (apply map + list + (map cdr channels-to-results) + lists))) + (if (null? active-channels) + (map + (match-lambda + ((#f . ('exception . exn)) + (raise-exception exn)) + ((#f . ('result . val)) + val)) + channels-to-results) + (loop + (perform-operation + (apply + choice-operation + (filter-map + (lambda (p) + (match p + ((channel . _) + (if channel + (wrap-operation + (get-operation channel) + (lambda (result) + (map (match-lambda + ((c . r) + (if (eq? channel c) + (cons #f + (match result + (('exception . exn) + result) + (_ + (cons 'result result)))) + (cons c r)))) + channels-to-results))) + #f)))) + channels-to-results)))))))) diff --git a/knots/promise.scm b/knots/promise.scm new file mode 100644 index 0000000..3eb0a81 --- /dev/null +++ b/knots/promise.scm @@ -0,0 +1,78 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots promise) + #:use-module (srfi srfi-9) + #:use-module (ice-9 atomic) + #:use-module (fibers) + #:use-module (fibers conditions) + #:export (fibers-delay + fibers-force + fibers-promise-reset)) + +(define-record-type + (make-fibers-promise thunk values-box evaluated-condition) + fibers-promise? + (thunk fibers-promise-thunk) + (values-box fibers-promise-values-box) + (evaluated-condition fibers-promise-evaluated-condition)) + +(define (fibers-delay thunk) + (make-fibers-promise + thunk + (make-atomic-box #f) + (make-condition))) + +(define (fibers-force fp) + (let ((res (atomic-box-compare-and-swap! + (fibers-promise-values-box fp) + #f + 'started))) + (if (eq? #f res) + (call-with-values + (lambda () + (with-exception-handler + (lambda (exn) + (atomic-box-set! (fibers-promise-values-box fp) + exn) + (signal-condition! + (fibers-promise-evaluated-condition fp)) + (raise-exception exn)) + (fibers-promise-thunk fp) + #:unwind? #t)) + (lambda vals + (atomic-box-set! (fibers-promise-values-box fp) + vals) + (signal-condition! + (fibers-promise-evaluated-condition fp)) + (apply values vals))) + (if (eq? res 'started) + (begin + (wait (fibers-promise-evaluated-condition fp)) + (let ((result (atomic-box-ref (fibers-promise-values-box fp)))) + (if (exception? result) + (raise-exception result) + (apply values result)))) + (if (exception? res) + (raise-exception res) + (apply values res)))))) + +(define (fibers-promise-reset fp) + (atomic-box-set! (fibers-promise-values-box fp) + #f)) diff --git a/knots/queue.scm b/knots/queue.scm new file mode 100644 index 0000000..ec9f703 --- /dev/null +++ b/knots/queue.scm @@ -0,0 +1,47 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots queue) + #:use-module (ice-9 q) + #:use-module (fibers) + #:use-module (fibers channels) + #:use-module (fibers operations) + #:export (spawn-queueing-fiber)) + +(define (spawn-queueing-fiber dest-channel) + (define queue (make-q)) + + (let ((queue-channel (make-channel))) + (spawn-fiber + (lambda () + (while #t + (if (q-empty? queue) + (enq! queue + (perform-operation + (get-operation queue-channel))) + (let ((front (q-front queue))) + (perform-operation + (choice-operation + (wrap-operation (get-operation queue-channel) + (lambda (val) + (enq! queue val))) + (wrap-operation (put-operation dest-channel front) + (lambda _ + (q-pop! queue)))))))))) + queue-channel)) diff --git a/knots/resource-pool.scm b/knots/resource-pool.scm new file mode 100644 index 0000000..67e9292 --- /dev/null +++ b/knots/resource-pool.scm @@ -0,0 +1,485 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots resource-pool) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-9) + #:use-module (ice-9 match) + #:use-module (ice-9 exceptions) + #:use-module (fibers) + #:use-module (fibers timers) + #:use-module (fibers channels) + #:use-module (fibers scheduler) + #:use-module (fibers operations) + #:export (resource-pool? + + make-resource-pool + destroy-resource-pool + + resource-pool-default-timeout + resource-pool-retry-checkout-timeout + + &resource-pool-timeout + resource-pool-timeout-error? + + resource-pool-default-timeout-handler + + call-with-resource-from-pool + with-resource-from-pool + + resource-pool-stats)) + +(define-record-type + (make-resource-pool-record name channel) + resource-pool? + (name resource-pool-name) + (channel resource-pool-channel)) + +(define* (make-resource-pool initializer max-size + #:key (min-size max-size) + (idle-seconds #f) + (delay-logger (const #f)) + (duration-logger (const #f)) + destructor + lifetime + scheduler + (name "unnamed") + ;; Add options for customizing timeouts + ) + (define (initializer/safe) + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "exception running ~A resource pool initializer: ~A:\n ~A\n" + name + initializer + exn) + #f) + (lambda () + (with-throw-handler #t + initializer + (lambda args + (backtrace)))) + #:unwind? #t)) + + (define (destructor/safe args) + (let ((success? + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "exception running resource pool destructor (~A): ~A:\n ~A\n" + name + destructor + exn) + #f) + (lambda () + (with-throw-handler #t + (lambda () + (destructor args) + #t) + (lambda _ + (backtrace)))) + #:unwind? #t))) + + (or success? + #t + (begin + (sleep 5) + (destructor/safe args))))) + + (let ((channel (make-channel)) + (checkout-failure-count 0)) + (spawn-fiber + (lambda () + (when idle-seconds + (spawn-fiber + (lambda () + (while #t + (sleep idle-seconds) + (put-message channel '(check-for-idle-resources)))))) + + (while #t + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "exception in the ~A pool fiber: ~A\n" + name + exn)) + (lambda () + (let loop ((resources '()) + (available '()) + (waiters '()) + (resources-last-used '())) + + (match (get-message channel) + (('checkout reply) + (if (null? available) + (if (= (length resources) max-size) + (loop resources + available + (cons reply waiters) + resources-last-used) + (let ((new-resource (initializer/safe))) + (if new-resource + (let ((checkout-success? + (perform-operation + (choice-operation + (wrap-operation + (put-operation reply new-resource) + (const #t)) + (wrap-operation (sleep-operation 1) + (const #f)))))) + (unless checkout-success? + (set! checkout-failure-count + (+ 1 checkout-failure-count))) + + (loop (cons new-resource resources) + (if checkout-success? + available + (cons new-resource available)) + waiters + (cons (get-internal-real-time) + resources-last-used))) + (loop resources + available + (cons reply waiters) + resources-last-used)))) + (let ((checkout-success? + (perform-operation + (choice-operation + (wrap-operation + (put-operation reply (car available)) + (const #t)) + (wrap-operation (sleep-operation 1) + (const #f)))))) + (unless checkout-success? + (set! checkout-failure-count + (+ 1 checkout-failure-count))) + + (if checkout-success? + (loop resources + (cdr available) + waiters + resources-last-used) + (loop resources + available + waiters + resources-last-used))))) + (('return resource) + (if (null? waiters) + (loop resources + (cons resource available) + waiters + (begin + (list-set! + resources-last-used + (list-index (lambda (x) + (eq? x resource)) + resources) + (get-internal-real-time)) + resources-last-used)) + (let ((checkout-success? + (perform-operation + (choice-operation + (wrap-operation + (put-operation (last waiters) + resource) + (const #t)) + (wrap-operation (sleep-operation 1) + (const #f)))))) + (unless checkout-success? + (set! checkout-failure-count + (+ 1 checkout-failure-count))) + + (if checkout-success? + (loop resources + available + (drop-right! waiters 1) + (begin + (list-set! + resources-last-used + (list-index (lambda (x) + (eq? x resource)) + resources) + (get-internal-real-time)) + resources-last-used)) + (begin + (for-each + (lambda (waiter) + (spawn-fiber + (lambda () + (perform-operation + (choice-operation + (put-operation waiter 'resource-pool-retry-checkout) + (sleep-operation 10)))))) + waiters) + + (loop resources + (cons resource available) + '() + (begin + (list-set! + resources-last-used + (list-index (lambda (x) + (eq? x resource)) + resources) + (get-internal-real-time)) + resources-last-used))))))) + (('stats reply) + (let ((stats + `((resources . ,(length resources)) + (available . ,(length available)) + (waiters . ,(length waiters)) + (checkout-failure-count . ,checkout-failure-count)))) + + (spawn-fiber + (lambda () + (perform-operation + (choice-operation + (wrap-operation + (put-operation reply stats) + (const #t)) + (wrap-operation (sleep-operation 1) + (const #f))))))) + + (loop resources + available + waiters + resources-last-used)) + (('check-for-idle-resources) + (let* ((resources-last-used-seconds + (map + (lambda (internal-time) + (/ (- (get-internal-real-time) internal-time) + internal-time-units-per-second)) + resources-last-used)) + (resources-to-destroy + (filter-map + (lambda (resource last-used-seconds) + (if (and (member resource available) + (> last-used-seconds idle-seconds)) + resource + #f)) + resources + resources-last-used-seconds))) + + (for-each + (lambda (resource) + (destructor/safe resource)) + resources-to-destroy) + + (loop (lset-difference eq? resources resources-to-destroy) + (lset-difference eq? available resources-to-destroy) + waiters + (filter-map + (lambda (resource last-used) + (if (memq resource resources-to-destroy) + #f + last-used)) + resources + resources-last-used)))) + (('destroy reply) + (if (= (length resources) (length available)) + (begin + (for-each + (lambda (resource) + (destructor/safe resource)) + resources) + (put-message reply 'destroy-success)) + (begin + (spawn-fiber + (lambda () + (perform-operation + (choice-operation + (put-operation reply 'resource-pool-destroy-failed) + (sleep-operation 10))))) + (loop resources + available + waiters + resources-last-used)))) + (unknown + (simple-format + (current-error-port) + "unrecognised message to ~A resource pool channel: ~A\n" + name + unknown) + (loop resources + available + waiters + resources-last-used))))) + #:unwind? #t))) + (or scheduler + (current-scheduler))) + + (make-resource-pool-record name channel))) + +(define (destroy-resource-pool pool) + (let ((reply (make-channel))) + (put-message (resource-pool-channel pool) + (list 'destroy reply)) + (let ((msg (get-message reply))) + (unless (eq? msg 'destroy-success) + (error msg))))) + +(define resource-pool-default-timeout + (make-parameter #f)) + +(define resource-pool-retry-checkout-timeout + (make-parameter 5)) + +(define &resource-pool-timeout + (make-exception-type '&recource-pool-timeout + &error + '(name))) + +(define make-resource-pool-timeout-error + (record-constructor &resource-pool-timeout)) + +(define resource-pool-timeout-error? + (record-predicate &resource-pool-timeout)) + +(define resource-pool-default-timeout-handler + (make-parameter #f)) + +(define* (call-with-resource-from-pool + pool proc #:key (timeout 'default) + (timeout-handler (resource-pool-default-timeout-handler))) + "Call PROC with a resource from POOL, blocking until a resource becomes +available. Return the resource once PROC has returned." + + (define retry-timeout + (resource-pool-retry-checkout-timeout)) + + (define timeout-or-default + (if (eq? timeout 'default) + (resource-pool-default-timeout) + timeout)) + + (let ((resource + (let ((reply (make-channel))) + (let loop ((start-time (get-internal-real-time))) + (let ((request-success? + (perform-operation + (choice-operation + (wrap-operation + (put-operation (resource-pool-channel pool) + `(checkout ,reply)) + (const #t)) + (wrap-operation (sleep-operation (or timeout-or-default + retry-timeout)) + (const #f)))))) + (if request-success? + (let ((time-remaining + (- (or timeout-or-default + retry-timeout) + (/ (- (get-internal-real-time) + start-time) + internal-time-units-per-second)))) + (if (> time-remaining 0) + (let ((response + (perform-operation + (choice-operation + (get-operation reply) + (wrap-operation (sleep-operation time-remaining) + (const #f)))))) + (if (or (not response) + (eq? response 'resource-pool-retry-checkout)) + (if (> (- (or timeout-or-default + retry-timeout) + (/ (- (get-internal-real-time) + start-time) + internal-time-units-per-second)) + 0) + (loop start-time) + (if (eq? timeout-or-default #f) + (loop (get-internal-real-time)) + #f)) + response)) + (if (eq? timeout-or-default #f) + (loop (get-internal-real-time)) + #f))) + (if (eq? timeout-or-default #f) + (loop (get-internal-real-time)) + #f))))))) + + (when (or (not resource) + (eq? resource 'resource-pool-retry-checkout)) + (when timeout-handler + (timeout-handler pool proc timeout)) + + (raise-exception + (make-resource-pool-timeout-error (resource-pool-name pool)))) + + (with-exception-handler + (lambda (exception) + (put-message (resource-pool-channel pool) + `(return ,resource)) + (raise-exception exception)) + (lambda () + (call-with-values + (lambda () + (with-throw-handler #t + (lambda () + (proc resource)) + (lambda _ + (backtrace)))) + (lambda vals + (put-message (resource-pool-channel pool) + `(return ,resource)) + (apply values vals)))) + #:unwind? #t))) + +(define-syntax-rule (with-resource-from-pool pool resource exp ...) + (call-with-resource-from-pool + pool + (lambda (resource) exp ...))) + +(define* (resource-pool-stats pool #:key (timeout 5)) + (let ((reply (make-channel)) + (start-time (get-internal-real-time))) + (perform-operation + (choice-operation + (wrap-operation + (put-operation (resource-pool-channel pool) + `(stats ,reply)) + (const #t)) + (wrap-operation (sleep-operation timeout) + (lambda _ + (raise-exception + (make-resource-pool-timeout-error)))))) + + (let ((time-remaining + (- timeout + (/ (- (get-internal-real-time) + start-time) + internal-time-units-per-second)))) + (if (> time-remaining 0) + (perform-operation + (choice-operation + (get-operation reply) + (wrap-operation (sleep-operation time-remaining) + (lambda _ + (raise-exception + (make-resource-pool-timeout-error)))))) + (raise-exception + (make-resource-pool-timeout-error)))))) + diff --git a/knots/timeout.scm b/knots/timeout.scm new file mode 100644 index 0000000..8f8a2fb --- /dev/null +++ b/knots/timeout.scm @@ -0,0 +1,200 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots timeout) + #:use-module (srfi srfi-71) + #:use-module (ice-9 match) + #:use-module (ice-9 atomic) + #:use-module (ice-9 exceptions) + #:use-module (ice-9 ports internal) + #:use-module (ice-9 suspendable-ports) + #:use-module (fibers) + #:use-module (fibers timers) + #:use-module (fibers channels) + #:use-module (fibers scheduler) + #:use-module (fibers operations) + #:export (with-fibers-timeout + + &port-timeout + port-timeout-error? + + &port-read-timeout + port-read-timeout-error + + &port-write-timeout + port-write-timeout-error? + + with-port-timeouts)) + +(define* (with-fibers-timeout thunk #:key timeout on-timeout) + (let ((channel (make-channel))) + (spawn-fiber + (lambda () + (with-exception-handler + (lambda (exn) + (perform-operation + (choice-operation + (put-operation channel (cons 'exception exn)) + (sleep-operation timeout)))) + (lambda () + (call-with-values thunk + (lambda vals + (perform-operation + (choice-operation + (put-operation channel vals) + (sleep-operation timeout)))))) + #:unwind? #t))) + + (match (perform-operation + (choice-operation + (get-operation channel) + (wrap-operation (sleep-operation timeout) + (const 'timeout)))) + ('timeout + (on-timeout)) + (('exception . exn) + (raise-exception exn)) + (vals + (apply values vals))))) + +(define &port-timeout + (make-exception-type '&port-timeout + &external-error + '(thunk port))) + +(define make-port-timeout-error + (record-constructor &port-timeout)) + +(define port-timeout-error? + (record-predicate &port-timeout)) + +(define &port-read-timeout + (make-exception-type '&port-read-timeout + &port-timeout + '())) + +(define make-port-read-timeout-error + (record-constructor &port-read-timeout)) + +(define port-read-timeout-error? + (record-predicate &port-read-timeout)) + +(define &port-write-timeout + (make-exception-type '&port-write-timeout + &port-timeout + '())) + +(define make-port-write-timeout-error + (record-constructor &port-write-timeout)) + +(define port-write-timeout-error? + (record-predicate &port-write-timeout)) + +(define (readable? port) + "Test if PORT is writable." + (= 1 (port-poll port "r" 0))) + +(define (writable? port) + "Test if PORT is writable." + (= 1 (port-poll port "w" 0))) + +(define (make-wait-operation ready? schedule-when-ready port + port-ready-fd this-procedure) + (make-base-operation #f + (lambda _ + (and (ready? port) values)) + (lambda (flag sched resume) + (define (commit) + (match (atomic-box-compare-and-swap! flag 'W 'S) + ('W (resume values)) + ('C (commit)) + ('S #f))) + (schedule-when-ready + sched (port-ready-fd port) commit)))) + +(define (wait-until-port-readable-operation port) + "Make an operation that will succeed when PORT is readable." + (unless (input-port? port) + (error "refusing to wait forever for input on non-input port")) + (make-wait-operation readable? schedule-task-when-fd-readable port + port-read-wait-fd + wait-until-port-readable-operation)) + +(define (wait-until-port-writable-operation port) + "Make an operation that will succeed when PORT is writable." + (unless (output-port? port) + (error "refusing to wait forever for output on non-output port")) + (make-wait-operation writable? schedule-task-when-fd-writable port + port-write-wait-fd + wait-until-port-writable-operation)) + +(define* (with-port-timeouts thunk + #:key timeout + (read-timeout timeout) + (write-timeout timeout)) + (define (no-fibers-wait thunk port mode timeout) + (define poll-timeout-ms 200) + + ;; When the GC runs, it restarts the poll syscall, but the timeout + ;; remains unchanged! When the timeout is longer than the time + ;; between the syscall restarting, I think this renders the + ;; timeout useless. Therefore, this code uses a short timeout, and + ;; repeatedly calls poll while watching the clock to see if it has + ;; timed out overall. + (let ((timeout-internal + (+ (get-internal-real-time) + (* internal-time-units-per-second timeout)))) + (let loop ((poll-value + (port-poll port mode poll-timeout-ms))) + (if (= poll-value 0) + (if (> (get-internal-real-time) + timeout-internal) + (raise-exception + (if (string=? mode "r") + (make-port-read-timeout-error thunk port) + (make-port-write-timeout-error thunk port))) + (loop (port-poll port mode poll-timeout-ms))) + poll-value)))) + + (parameterize + ((current-read-waiter + (lambda (port) + (if (current-scheduler) + (perform-operation + (choice-operation + (wait-until-port-readable-operation port) + (wrap-operation + (sleep-operation read-timeout) + (lambda () + (raise-exception + (make-port-read-timeout-error thunk port)))))) + (no-fibers-wait thunk port "r" read-timeout)))) + (current-write-waiter + (lambda (port) + (if (current-scheduler) + (perform-operation + (choice-operation + (wait-until-port-writable-operation port) + (wrap-operation + (sleep-operation write-timeout) + (lambda () + (raise-exception + (make-port-write-timeout-error thunk port)))))) + (no-fibers-wait thunk port "w" write-timeout))))) + (thunk))) diff --git a/knots/web-server.scm b/knots/web-server.scm new file mode 100644 index 0000000..b94106f --- /dev/null +++ b/knots/web-server.scm @@ -0,0 +1,263 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; Copyright (C) 2010-2013,2015,2017 Free Software Foundation, Inc. + +;; This library is free software; you can redistribute it and/or +;; modify it under the terms of the GNU Lesser General Public +;; License as published by the Free Software Foundation; either +;; version 3 of the License, or (at your option) any later version. +;; +;; This library is distributed in the hope that it will be useful, +;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;; Lesser General Public License for more details. +;; +;; You should have received a copy of the GNU Lesser General Public License +;; along with this program. If not, see . + +(define-module (knots web-server) + #:use-module (srfi srfi-9) + #:use-module (srfi srfi-71) + #:use-module (fibers) + #:use-module (fibers conditions) + #:use-module (rnrs bytevectors) + #:use-module (ice-9 binary-ports) + #:use-module (ice-9 textual-ports) + #:use-module (ice-9 iconv) + #:use-module (ice-9 match) + #:use-module ((srfi srfi-9 gnu) #:select (set-field)) + #:use-module (system repl error-handling) + #:use-module (web http) + #:use-module (web request) + #:use-module (web response) + #:use-module (knots non-blocking) + #:export (run-knots-web-server + + web-server? + web-server-socket + web-server-port)) + +(define (make-default-socket family addr port) + (let ((sock (socket PF_INET SOCK_STREAM 0))) + (setsockopt sock SOL_SOCKET SO_REUSEADDR 1) + (fcntl sock F_SETFD FD_CLOEXEC) + (bind sock family addr port) + sock)) + +(define (extend-response r k v . additional) + (define (extend-alist alist k v) + (let ((pair (assq k alist))) + (acons k v (if pair (delq pair alist) alist)))) + (let ((r (set-field r (response-headers) + (extend-alist (response-headers r) k v)))) + (if (null? additional) + r + (apply extend-response r additional)))) + +;; -> response body +(define (sanitize-response request response body) + "\"Sanitize\" the given response and body, making them appropriate for +the given request. + +As a convenience to web handler authors, RESPONSE may be given as +an alist of headers, in which case it is used to construct a default +response. Ensures that the response version corresponds to the request +version. If BODY is a string, encodes the string to a bytevector, +in an encoding appropriate for RESPONSE. Adds a +‘content-length’ and ‘content-type’ header, as necessary. + +If BODY is a procedure, it is called with a port as an argument, +and the output collected as a bytevector. In the future we might try to +instead use a compressing, chunk-encoded port, and call this procedure +later, in the write-client procedure. Authors are advised not to rely +on the procedure being called at any particular time." + (cond + ((list? response) + (sanitize-response request + (build-response #:version (request-version request) + #:headers response) + body)) + ((not (equal? (request-version request) (response-version response))) + (sanitize-response request + (adapt-response-version response + (request-version request)) + body)) + ((not body) + (values response #vu8())) + ((string? body) + (let* ((type (response-content-type response + '(text/plain))) + (declared-charset (assq-ref (cdr type) 'charset)) + (charset (or declared-charset "utf-8"))) + (sanitize-response + request + (if declared-charset + response + (extend-response response 'content-type + `(,@type (charset . ,charset)))) + (string->bytevector body charset)))) + ((not (or (bytevector? body) + (procedure? body))) + (error "unexpected body type")) + ((and (response-must-not-include-body? response) + body + ;; FIXME make this stricter: even an empty body should be prohibited. + (not (zero? (bytevector-length body)))) + (error "response with this status code must not include body" response)) + (else + ;; check length; assert type; add other required fields? + (values (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))))) + (if (eq? (request-method request) 'HEAD) + ;; Responses to HEAD requests must not include bodies. + ;; We could raise an error here, but it seems more + ;; appropriate to just do something sensible. + #f + body))))) + +(define (with-stack-and-prompt thunk) + (call-with-prompt (default-prompt-tag) + (lambda () (start-stack #t (thunk))) + (lambda (k proc) + (with-stack-and-prompt (lambda () (proc k)))))) + +(define (keep-alive? response) + (let ((v (response-version response))) + (and (or (< (response-code response) 400) + (= (response-code response) 404)) + (case (car v) + ((1) + (case (cdr v) + ((1) (not (memq 'close (response-connection response)))) + ((0) (memq 'keep-alive (response-connection response))))) + (else #f))))) + +(define (handle-request handler client) + (let ((request + (catch #t + (lambda () + (read-request client)) + (lambda (key . args) + (display "While reading request:\n" (current-error-port)) + (print-exception (current-error-port) #f key args) + #f)))) + (let ((response + body + (cond + ((not request) + ;; Bad request. + (values (build-response #:version '(1 . 0) #:code 400 + #:headers '((content-length . 0))) + #vu8())) + (else + (call-with-error-handling + (lambda () + (call-with-values (lambda () + (with-stack-and-prompt + (lambda () + (handler request)))) + (lambda (response body) + (sanitize-response request response body)))) + #:on-error 'backtrace + #:post-error (lambda _ + (values (build-response #:code 500) #f))))))) + (write-response response client) + (when body + (if (procedure? body) + (if (response-content-length response) + (body client) + (let ((chunked-port + (make-chunked-output-port client + #:keep-alive? #t))) + (body chunked-port) + (close-port chunked-port))) + (put-bytevector client body))) + (force-output client) + + (keep-alive? response)))) + +(define (client-loop client handler) + ;; Always disable Nagle's algorithm, as we handle buffering + ;; ourselves; when we force-output, we really want the data to go + ;; out. + (setvbuf client 'block 1024) + (setsockopt client IPPROTO_TCP TCP_NODELAY 1) + (with-throw-handler #t + (lambda () + (let loop () + (cond + ((catch #t + (lambda () (eof-object? (lookahead-u8 client))) + (lambda _ #t)) + (close-port client)) + (else + (let ((keep-alive? (handle-request handler client))) + (if keep-alive? + (loop) + (close-port client))))))) + (lambda (k . args) + (close-port client)))) + +(define-record-type + (make-web-server socket port) + web-server? + (socket web-server-socket) + (port web-server-port)) + +(define* (run-knots-web-server handler #:key + (host #f) + (family AF_INET) + (addr (if host + (inet-pton family host) + INADDR_LOOPBACK)) + (port 8080) + (socket (make-default-socket family addr port))) + "Run the fibers web server. + +HANDLER should be a procedure that takes one argument, the HTTP +request and returns two values, the response and response body. + +For example, here is a simple \"Hello, World!\" server: + +@example + (define (handler request) + (let ((body (read-request-body request))) + (values '((content-type . (text/plain))) + \"Hello, World!\"))) + (run-server handler) +@end example + +The response and body will be run through ‘sanitize-response’ +before sending back to the client." + (non-blocking-port socket) + ;; We use a large backlog by default. If the server is suddenly hit + ;; with a number of connections on a small backlog, clients won't + ;; receive confirmation for their SYN, leading them to retry -- + ;; probably successfully, but with a large latency. + (listen socket 1024) + (sigaction SIGPIPE SIG_IGN) + + (spawn-fiber + (lambda () + (let loop () + (match (accept socket (logior SOCK_NONBLOCK SOCK_CLOEXEC)) + ((client . sockaddr) + (spawn-fiber (lambda () + (client-loop client handler)) + #:parallel? #t) + (loop)))))) + + (make-web-server socket + (vector-ref (getsockname socket) + 2))) ; Not sure what this structure is diff --git a/knots/worker-threads.scm b/knots/worker-threads.scm new file mode 100644 index 0000000..f4116e9 --- /dev/null +++ b/knots/worker-threads.scm @@ -0,0 +1,577 @@ +;;; Guile Knots +;;; Copyright © 2020 Christopher Baines +;;; +;;; This file is part of Guile Knots. +;;; +;;; The Guile Knots is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU General Public License as +;;; published by the Free Software Foundation; either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; The Guile Knots is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with the guix-data-service. If not, see +;;; . + +(define-module (knots worker-threads) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-19) + #:use-module (srfi srfi-71) + #:use-module (system foreign) + #:use-module (system base target) + #:use-module (rnrs bytevectors) + #:use-module (ice-9 q) + #:use-module (ice-9 match) + #:use-module (ice-9 threads) + #:use-module (fibers) + #:use-module (fibers timers) + #:use-module (fibers channels) + #:use-module (fibers operations) + #:export (set-thread-name + thread-name + + make-worker-thread-channel + call-with-worker-thread + + &worker-thread-timeout + worker-thread-timeout-error? + + %worker-thread-default-timeout + + create-work-queue)) + +(define* (syscall->procedure return-type name argument-types + #:key library) + "Return a procedure that wraps the C function NAME using the dynamic FFI, +and that returns two values: NAME's return value, and errno. When LIBRARY is +specified, look up NAME in that library rather than in the global symbol name +space. + +If an error occurs while creating the binding, defer the error report until +the returned procedure is called." + (catch #t + (lambda () + ;; Note: When #:library is set, try it first and fall back to libc + ;; proper. This is because libraries like libutil.so have been subsumed + ;; by libc.so with glibc >= 2.34. + (let ((ptr (dynamic-func name + (if library + (or (false-if-exception + (dynamic-link library)) + (dynamic-link)) + (dynamic-link))))) + ;; The #:return-errno? facility was introduced in Guile 2.0.12. + (pointer->procedure return-type ptr argument-types + #:return-errno? #t))) + (lambda args + (lambda _ + (throw 'system-error name "~A" (list (strerror ENOSYS)) + (list ENOSYS)))))) + +(define %prctl + ;; Should it win the API contest against 'ioctl'? You tell us! + (syscall->procedure int "prctl" + (list int unsigned-long unsigned-long + unsigned-long unsigned-long))) + +(define PR_SET_NAME 15) ; +(define PR_GET_NAME 16) +(define PR_SET_CHILD_SUBREAPER 36) + +(define (set-child-subreaper!) + "Set the CHILD_SUBREAPER capability for the current process." + (%prctl PR_SET_CHILD_SUBREAPER 1 0 0 0)) + +(define %max-thread-name-length + ;; Maximum length in bytes of the process name, including the terminating + ;; zero. + 16) + +(define (set-thread-name!/linux name) + "Set the name of the calling thread to NAME. NAME is truncated to 15 +bytes." + (let ((ptr (string->pointer name))) + (let ((ret + err + (%prctl PR_SET_NAME + (pointer-address ptr) 0 0 0))) + (unless (zero? ret) + (throw 'set-process-name "set-process-name" + "set-process-name: ~A" + (list (strerror err)) + (list err)))))) + +(define (bytes->string bytes) + "Read BYTES, a list of bytes, and return the null-terminated string decoded +from there, or #f if that would be an empty string." + (match (take-while (negate zero?) bytes) + (() + #f) + (non-zero + (list->string (map integer->char non-zero))))) + +(define (thread-name/linux) + "Return the name of the calling thread as a string." + (let ((buf (make-bytevector %max-thread-name-length))) + (let ((ret + err + (%prctl PR_GET_NAME + (pointer-address (bytevector->pointer buf)) + 0 0 0))) + (if (zero? ret) + (bytes->string (bytevector->u8-list buf)) + (throw 'process-name "process-name" + "process-name: ~A" + (list (strerror err)) + (list err)))))) + +(define set-thread-name + (if (string-contains %host-type "linux") + set-thread-name!/linux + (const #f))) + +(define thread-name + (if (string-contains %host-type "linux") + thread-name/linux + (const ""))) + +(define %worker-thread-args + (make-parameter #f)) + +(define* (make-worker-thread-channel initializer + #:key (parallelism 1) + (delay-logger (lambda _ #f)) + (duration-logger (const #f)) + destructor + lifetime + (log-exception? (const #t)) + (expire-on-exception? #f) + (name "unnamed")) + "Return a channel used to offload work to a dedicated thread. ARGS are the +arguments of the worker thread procedure." + (define thread-proc-vector + (make-vector parallelism #f)) + + (define (initializer/safe) + (let ((args + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "exception running initializer in worker thread (~A): ~A:\n ~A\n" + name + initializer + exn) + #f) + (lambda () + (with-throw-handler #t + initializer + (lambda args + (backtrace)))) + #:unwind? #t))) + + (if args + args + ;; never give up, just keep retrying + (begin + (sleep 1) + (initializer/safe))))) + + (define (destructor/safe args) + (let ((success? + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "exception running destructor in worker thread (~A): ~A:\n ~A\n" + name + destructor + exn) + #f) + (lambda () + (with-throw-handler #t + (lambda () + (apply destructor args) + #t) + (lambda _ + (backtrace)))) + #:unwind? #t))) + + (or success? + #t + (begin + (sleep 1) + (destructor/safe args))))) + + (define (process thread-index channel args) + (let loop ((current-lifetime lifetime)) + (let ((exception? + (match (get-message channel) + (((? channel? reply) sent-time (? procedure? proc)) + (let ((time-delay + (- (get-internal-real-time) + sent-time))) + (delay-logger (/ time-delay + internal-time-units-per-second)) + + (let* ((start-time (get-internal-real-time)) + (response + (with-exception-handler + (lambda (exn) + (list 'worker-thread-error + (/ (- (get-internal-real-time) + start-time) + internal-time-units-per-second) + exn)) + (lambda () + (vector-set! thread-proc-vector + thread-index + proc) + (with-throw-handler #t + (lambda () + (call-with-values + (lambda () + (start-stack + 'worker-thread + (apply proc args))) + (lambda vals + (cons (/ (- (get-internal-real-time) + start-time) + internal-time-units-per-second) + vals)))) + (lambda args + (when (match args + (('%exception exn) + (log-exception? exn)) + (_ #t)) + (simple-format + (current-error-port) + "worker-thread: exception: ~A\n" args) + (backtrace))))) + #:unwind? #t))) + (put-message reply + response) + + (vector-set! thread-proc-vector + thread-index + #f) + + (match response + (('worker-thread-error duration _) + (when duration-logger + (duration-logger duration proc)) + #t) + ((duration . _) + (when duration-logger + (duration-logger duration proc)) + #f)))))))) + (unless (and expire-on-exception? + exception?) + (if (number? current-lifetime) + (unless (< current-lifetime 0) + (loop (if current-lifetime + (- current-lifetime 1) + #f))) + (loop #f)))))) + + (let ((channel (make-channel))) + (for-each + (lambda (thread-index) + (call-with-new-thread + (lambda () + (catch 'system-error + (lambda () + (set-thread-name + (string-append + name " w t " + (number->string thread-index)))) + (const #t)) + + (let init ((args (initializer/safe))) + (with-exception-handler + (lambda (exn) + (simple-format + (current-error-port) + "worker-thread-channel: exception: ~A\n" exn)) + (lambda () + (parameterize ((%worker-thread-args args)) + (process thread-index channel args))) + #:unwind? #t) + + (when destructor + (destructor/safe args)) + + (init (initializer/safe)))))) + (iota parallelism)) + + (values channel + thread-proc-vector))) + +(define &worker-thread-timeout + (make-exception-type '&worker-thread-timeout + &error + '())) + +(define make-worker-thread-timeout-error + (record-constructor &worker-thread-timeout)) + +(define worker-thread-timeout-error? + (record-predicate &worker-thread-timeout)) + +(define %worker-thread-default-timeout + (make-parameter 30)) + +(define* (call-with-worker-thread channel proc #:key duration-logger + (timeout (%worker-thread-default-timeout))) + "Send PROC to the worker thread through CHANNEL. Return the result of PROC. +If already in the worker thread, call PROC immediately." + (let ((args (%worker-thread-args))) + (if args + (apply proc args) + (let* ((reply (make-channel)) + (operation-success? + (perform-operation + (let ((put + (wrap-operation + (put-operation channel + (list reply + (get-internal-real-time) + proc)) + (const #t)))) + + (if timeout + (choice-operation + put + (wrap-operation (sleep-operation timeout) + (const #f))) + put))))) + + (unless operation-success? + (raise-exception + (make-worker-thread-timeout-error))) + + (match (get-message reply) + (('worker-thread-error duration exn) + (when duration-logger + (duration-logger duration)) + (raise-exception exn)) + ((duration . result) + (when duration-logger + (duration-logger duration)) + (apply values result))))))) + +(define* (create-work-queue thread-count-parameter proc + #:key thread-start-delay + (thread-stop-delay + (make-time time-duration 0 0)) + (name "unnamed") + priority= running-jobs-count + desired-thread-count))) + + (define (thread-idle-for-too-long? last-job-finished-at) + (time>=? + (time-difference (current-time time-monotonic) + last-job-finished-at) + thread-stop-delay)) + + (define (stop-thread) + (hash-remove! running-job-args + thread-index) + (unlock-mutex queue-mutex)) + + (call-with-new-thread + (lambda () + (catch 'system-error + (lambda () + (set-thread-name + (string-append name " q t " + (number->string thread-index)))) + (const #t)) + + (let loop ((last-job-finished-at (current-time time-monotonic))) + (lock-mutex queue-mutex) + + (if (too-many-threads?) + (stop-thread) + (let ((job-args + (if (q-empty? queue) + ;; #f from wait-condition-variable indicates a timeout + (if (wait-condition-variable + job-available + queue-mutex + (+ 9 (time-second (current-time)))) + ;; Another thread could have taken + ;; the job in the mean time + (if (q-empty? queue) + #f + (if priority threads-to-start 0) + (for-each + (lambda (thread-index) + (when (eq? (hash-ref running-job-args + thread-index + 'slot-free) + 'slot-free) + (let* ((now (current-time time-monotonic)) + (elapsed (time-difference now + previous-thread-started-at))) + (when (or (eq? #f thread-start-delay) + (time>=? elapsed thread-start-delay)) + (set! previous-thread-started-at now) + (hash-set! running-job-args + thread-index + #f) + (start-thread thread-index))))) + (iota desired-count))))))) + + (if (procedure? thread-count-parameter) + (call-with-new-thread + (lambda () + (catch 'system-error + (lambda () + (set-thread-name + (string-append name " q t"))) + (const #t)) + + (while #t + (sleep 15) + (with-mutex queue-mutex + (let ((idle-threads (hash-count (lambda (index val) + (eq? #f val)) + running-job-args))) + (when (= 0 idle-threads) + (start-new-threads-if-necessary (get-thread-count)))))))) + (start-new-threads-if-necessary (get-thread-count))) + + (values process-job count-jobs count-threads list-jobs))) diff --git a/pre-inst-env.in b/pre-inst-env.in new file mode 100644 index 0000000..ebf1a05 --- /dev/null +++ b/pre-inst-env.in @@ -0,0 +1,13 @@ +#!/bin/sh + +abs_top_srcdir="`cd "@abs_top_srcdir@" > /dev/null; pwd`" +abs_top_builddir="`cd "@abs_top_builddir@" > /dev/null; pwd`" + +GUILE_LOAD_COMPILED_PATH="$abs_top_builddir${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH" +GUILE_LOAD_PATH="$abs_top_builddir:$abs_top_srcdir${GUILE_LOAD_PATH:+:}:$GUILE_LOAD_PATH" +export GUILE_LOAD_COMPILED_PATH GUILE_LOAD_PATH + +PATH="$abs_top_builddir:$PATH" +export PATH + +exec "$@" diff --git a/tests.scm b/tests.scm new file mode 100644 index 0000000..6c07374 --- /dev/null +++ b/tests.scm @@ -0,0 +1,28 @@ +(define-module (tests) + #:use-module (ice-9 exceptions) + #:use-module (fibers) + #:export (run-fibers-for-tests + assert-no-heap-growth)) + +(define (run-fibers-for-tests thunk) + (let ((result + (run-fibers + (lambda () + (with-exception-handler + (lambda (exn) + exn) + (lambda () + (with-throw-handler #t + thunk + (lambda _ + (backtrace))) + #t) + #:unwind? #t)) + #:hz 0 + #:parallelism 1))) + (if (exception? result) + (raise-exception result) + result))) + +(define (assert-no-heap-growth thunk) + (thunk)) diff --git a/tests/non-blocking.scm b/tests/non-blocking.scm new file mode 100644 index 0000000..0f81f58 --- /dev/null +++ b/tests/non-blocking.scm @@ -0,0 +1,31 @@ +(use-modules (tests) + (fibers) + (unit-test) + (web uri) + (web client) + (web response) + (knots web-server) + (knots non-blocking)) + +(run-fibers-for-tests + (lambda () + (let* ((web-server + (run-knots-web-server + (lambda (request) + (values '((content-type . (text/plain))) + "Hello, World!")) + #:port 0)) ;; Bind to any port + (port + (web-server-port web-server)) + (uri + (build-uri 'http #:host "127.0.0.1" #:port port))) + + + (assert-equal + 200 + (response-code + (http-get + uri + #:port (nonblocking-open-socket-for-uri uri))))))) + +(display "non-blocking test finished successfully\n") diff --git a/tests/parallelism.scm b/tests/parallelism.scm new file mode 100644 index 0000000..8249d68 --- /dev/null +++ b/tests/parallelism.scm @@ -0,0 +1,15 @@ +(use-modules (tests) + (fibers) + (unit-test) + (knots parallelism)) + +(run-fibers-for-tests + (lambda () + (assert-equal + 1122 + (apply + (fibers-map + (lambda (i) + (* 2 i)) + (iota 34)))))) + +(display "parallelism test finished successfully\n") diff --git a/tests/promise.scm b/tests/promise.scm new file mode 100644 index 0000000..b7dec73 --- /dev/null +++ b/tests/promise.scm @@ -0,0 +1,20 @@ +(use-modules (tests) + (fibers) + (unit-test) + (knots parallelism) + (knots promise)) + +(run-fibers-for-tests + (lambda () + (let ((promises + (map (lambda (i) + (fibers-delay + (lambda () + (* i 2)))) + (iota 10)))) + + (assert-equal + 90 + (apply + (fibers-map fibers-force promises)))))) + +(display "promise test finished successfully\n") diff --git a/tests/queue.scm b/tests/queue.scm new file mode 100644 index 0000000..c80e5fd --- /dev/null +++ b/tests/queue.scm @@ -0,0 +1,22 @@ +(use-modules (tests) + (fibers) + (fibers channels) + (unit-test) + (knots queue)) + +(run-fibers-for-tests + (lambda () + (let* ((dest-channel + (make-channel)) + (queue-channel + (spawn-queueing-fiber dest-channel))) + + (put-message queue-channel 1) + (put-message queue-channel 2) + (put-message queue-channel 3) + + (assert-equal 1 (get-message dest-channel)) + (assert-equal 2 (get-message dest-channel)) + (assert-equal 3 (get-message dest-channel))))) + +(display "queue test finished successfully\n") diff --git a/tests/resource-pool.scm b/tests/resource-pool.scm new file mode 100644 index 0000000..ebd4682 --- /dev/null +++ b/tests/resource-pool.scm @@ -0,0 +1,18 @@ +(use-modules (tests) + (fibers) + (unit-test) + (knots resource-pool)) + +(run-fibers-for-tests + (lambda () + (let ((resource-pool (make-resource-pool + (lambda () + 2) + 1))) + (assert-equal + (with-resource-from-pool resource-pool + res + res) + 2)))) + +(display "resource-pool test finished successfully\n") diff --git a/tests/timeout.scm b/tests/timeout.scm new file mode 100644 index 0000000..bab39d2 --- /dev/null +++ b/tests/timeout.scm @@ -0,0 +1,22 @@ +(use-modules (tests) + (fibers) + (unit-test) + (knots timeout)) + +(run-fibers-for-tests + (lambda () + (assert-equal + 1 + (with-fibers-timeout + (const 1) + #:timeout 10)) + + (assert-equal + 2 + (with-fibers-timeout + (lambda () + (sleep 10)) + #:timeout 0.1 + #:on-timeout (const 2))))) + +(display "timeout test finished successfully\n") diff --git a/tests/web-server.scm b/tests/web-server.scm new file mode 100644 index 0000000..5a76d0f --- /dev/null +++ b/tests/web-server.scm @@ -0,0 +1,30 @@ +(use-modules (tests) + (fibers) + (unit-test) + (web uri) + (web client) + (web response) + (knots web-server) + (knots non-blocking)) + +(run-fibers-for-tests + (lambda () + (let* ((web-server + (run-knots-web-server + (lambda (request) + (values '((content-type . (text/plain))) + "Hello, World!")) + #:port 0)) ;; Bind to any port + (port + (web-server-port web-server)) + (uri + (build-uri 'http #:host "127.0.0.1" #:port port))) + + (assert-equal + 200 + (response-code + (http-get + uri + #:port (nonblocking-open-socket-for-uri uri))))))) + +(display "web-server test finished successfully\n") diff --git a/tests/worker-threads.scm b/tests/worker-threads.scm new file mode 100644 index 0000000..72a56dc --- /dev/null +++ b/tests/worker-threads.scm @@ -0,0 +1,32 @@ +(use-modules (tests) + (srfi srfi-71) + (fibers) + (unit-test) + (knots worker-threads)) + +(let ((worker-thread-channel + (make-worker-thread-channel + (const '()) + #:parallelism 2))) + + (run-fibers-for-tests + (lambda () + (assert-equal + (call-with-worker-thread + worker-thread-channel + (lambda () + 4)) + 4)))) + +(let ((process-job + count-jobs + count-threads + list-jobs + (create-work-queue + 2 + (lambda (i) + (* i 2))))) + + (process-job 3)) + +(display "worker-threads test finished successfully\n")