107 lines
4.3 KiB
Scheme
107 lines
4.3 KiB
Scheme
(module check mzscheme
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(define version-url "http://download.plt-scheme.org/version")
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(define timeout 30)
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;; This file is invoked from the installer, without using zo files -- so
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;; using net/url.ss is extremely slow. Instead, do things directly.
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;; (require (lib "url.ss" "net"))
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;; (define (url->port url)
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;; (get-pure-port (string->url url)))
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(define (url->port url)
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(define-values (host path)
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(apply values (cdr (regexp-match #rx"^http://([^/:@]+)(/.*)$" url))))
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(define-values (i o) (tcp-connect host 80))
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(fprintf o "GET ~a HTTP/1.0\r\nHost: ~a\r\n\r\n" path host)
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(flush-output o)
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(close-output-port o)
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(regexp-match #rx"^HTTP/[0-9.]+ 200 OK\r\n.*?\r\n\r\n" i)
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i)
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(define error-value
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(case-lambda
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[(what) `(error ,what)]
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[(what more)
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`(error ,what
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,(cond [(list? more) (format "~a" more)]
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[(exn? more) (format "(~a)" (exn-message more))]
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[else (format "(~a)" more)]))]))
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(define (with-timeout timeout thunk)
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(define result #f)
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(let ([r (sync/timeout timeout
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(thread (lambda ()
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(set! result
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(with-handlers
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([void (lambda (e)
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(error-value "internal error" e))])
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(thunk))))))])
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(if r result (error-value "timeout"))))
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(define (check-version/timeout)
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(let/ec escape
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(define (err . args) (escape (apply error-value args)))
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(define-syntax try
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(syntax-rules ()
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[(_ expr error-message)
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(with-handlers ([void (lambda (e) (err error-message e))]) expr)]))
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;; Get server information, carefully
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(define version-info
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(parameterize ([current-input-port
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(try (url->port version-url)
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"could not connect to website")])
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(try (read) "unexpected response from server")))
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(define (get key)
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(cond [(assq key version-info) => cadr]
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[else (err (format "no `~s' in response" key) version-info)]))
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(unless (and (list? version-info)
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(andmap (lambda (x)
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(and (list? x)
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(= 2 (length x))
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(symbol? (car x))
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(string? (cadr x))))
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version-info))
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(err "bad response from server" version-info))
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;; Make a decision
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(let ([current (version)]
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[stable (get 'stable)]
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[recent (get 'recent)])
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(cond
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;; we have the newest version (can be > if we have an svn build)
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[(string>=? current recent) 'ok]
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;; we're stable, but there's a newer version
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[(equal? current stable)
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`(ok-but ,recent)]
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;; new version out -- no alphas or we have an alpha => show recent
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;; (also for svn builds of a stable version -- anything with ".")
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[(or (equal? recent stable)
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(and (regexp-match #rx"[.]" current)
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;; but if we have an alpha that is older then the current
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;; stable then go to the next case
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(string>=? current stable)))
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`(newer ,recent)]
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;; new version out, we have an outdated stable, there is also an alpha
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;; (alternatively, we have an alpha that is older than the current
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;; stable)
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[else `(newer ,stable ,recent)]))))
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;; Check the version on the server and compare to our version.
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;; Possible return values (message is always a string):
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;; * `ok
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;; You're fine.
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;; * `(ok-but ,version)
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;; You have a fine stable version, but note that there is a newer alpha
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;; * `(newer ,version)
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;; You have an old version, please upgrade to `version'
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;; * `(newer ,version ,alpha)
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;; You have an old version, please upgrade to `version' you may consider
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;; also the alpha version
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;; * `(error ,message [,additional-info])
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;; An error occured, the third (optional) value can be shown as the system
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;; error that happened or the value that caused an error.
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(provide check-version)
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(define (check-version)
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(with-timeout timeout check-version/timeout))
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)
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