600 lines
28 KiB
Scheme
600 lines
28 KiB
Scheme
(module web-server-unit mzscheme
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(require "sig.ss"
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"connection-manager.ss"
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"configuration-structures.ss"
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"util.ss"
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"response.ss"
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"servlet-tables.ss"
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"servlet.ss"
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"timer.ss")
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(require (prefix passwords: "dispatch-passwords.ss"))
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(require (lib "tcp-sig.ss" "net")
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(lib "unitsig.ss")
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(lib "string.ss")
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(lib "url.ss" "net")
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(lib "xml.ss" "xml")
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(lib "list.ss"))
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(provide web-server@)
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(define myprint
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(lambda args
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(apply fprintf (cons (current-error-port) args))))
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;; ****************************************
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;; stick this auxilliary outside the unit so
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;; I can get at it with require/expose
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;; get-host : Url (listof (cons Symbol String)) -> String
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;; host names are case insesitive---Internet RFC 1034
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(define DEFAULT-HOST-NAME "<none>")
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(define (get-host uri headers)
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(let ([lower!
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(lambda (s)
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(string-lowercase! s)
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s)])
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(cond
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[(url-host uri) => lower!]
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[(assq 'host headers)
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=>
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(lambda (h) (lower! (bytes->string/utf-8 (cdr h))))]
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[else DEFAULT-HOST-NAME])))
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;; ****************************************
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(define web-server@
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(unit/sig web-server^
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(import net:tcp^ (config : web-config^))
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(define current-server-custodian (make-parameter #f))
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;; make-servlet-custodian: -> custodian
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;; create a custodian for the dynamic extent of a servlet continuation
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(define (make-servlet-custodian)
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(make-custodian (current-server-custodian)))
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;; serve: -> -> void
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;; start the server and return a thunk to shut it down
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(define (serve)
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(let ([the-server-custodian (make-custodian)])
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(start-connection-manager the-server-custodian)
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(parameterize ([current-custodian the-server-custodian]
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[current-server-custodian the-server-custodian])
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(thread
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(lambda ()
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(listener-loop))))
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(lambda ()
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(custodian-shutdown-all the-server-custodian))))
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;; listener-loop : -> void
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;; loops around starting a listener if the current listener dies
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(define (listener-loop)
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(let ([sema (make-semaphore 0)])
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(let loop ()
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(let ([listener (tcp-listen config:port config:max-waiting
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#t config:listen-ip)])
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(let ([get-ports
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(lambda ()
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(let-values ([(ip op) (tcp-accept listener)])
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;; Try to set buffer mode, and if it can't be set,
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;; assume that it doesn't matter. (Only happens
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;; when tcp-accept is not MzScheme's version.)
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(with-handlers ([exn:fail? void])
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(file-stream-buffer-mode op 'none))
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(values ip op)))])
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(thread
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(lambda ()
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(with-handlers ([void (lambda (e)
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; If the exception did not kill the listener
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(with-handlers ([void void])
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(tcp-close listener))
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(semaphore-post sema)
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; Rethrow the error to this thread's error printer
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(raise e))])
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(server-loop get-ports))))))
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(semaphore-wait sema)
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(loop))))
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;; server-loop: (-> i-port o-port) -> void
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;; start a thread to handle each incoming connection
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(define (server-loop get-ports)
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(let loop ()
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(let ([connection-cust (make-custodian)])
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(parameterize ([current-custodian connection-cust])
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(let-values ([(ip op) (get-ports)])
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(serve-ports/inner ip op))))
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(loop)))
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;; serve-ports : input-port output-port -> void
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;; returns immediately, spawning a thread to handle
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;; the connection
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;; NOTE: this doesn't use a connection manager since
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;; connection managers don't do anything anyways. -robby
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;; NOTE: (GregP) should allow the user to pass in a connection-custodian
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(define (serve-ports ip op)
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(let ([server-cust (make-custodian)])
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(parameterize ([current-custodian server-cust]
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[current-server-custodian server-cust])
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(let ([connection-cust (make-custodian)])
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(parameterize ([current-custodian connection-cust])
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(serve-ports/inner ip op))))))
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;; serve-ports/inner : input-port output-port -> void
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;; returns immediately, spawning a thread to handle
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(define (serve-ports/inner ip op)
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(thread
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(lambda ()
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(let ([conn (new-connection config:initial-connection-timeout
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ip op (current-custodian) #f)])
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(with-handlers ([exn:fail:network?
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(lambda (e)
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(set-connection-close?! conn #t)
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; XXX: Can this block on the mutex?
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(kill-connection! conn)
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(raise e))])
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(serve-connection conn))))))
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;; serve-connection: connection -> void
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;; respond to all requests on this connection
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(define (serve-connection conn)
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(let connection-loop ()
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(let-values ([(req close?) (read-request conn)])
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(let* ([host (get-host (request-uri req) (request-headers req))]
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[host-conf (config:virtual-hosts host)])
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((host-log-message host-conf) (request-host-ip req)
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(request-client-ip req) (request-method req) (request-uri req) host)
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(set-connection-close?! conn close?)
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(adjust-connection-timeout! conn config:initial-connection-timeout)
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(dispatch conn req host-conf)
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(cond
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[(connection-close? conn) (kill-connection! conn)]
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[else (connection-loop)])))))
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;; dispatch : connection request host -> void
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;; NOTE: (Jay) First step towards a different way of doing dispatching. Initially,
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;; the dispatchers will be hard-coded based on the configuration file.
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;; Eventually, they will be more configurable and extensible.
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(define (dispatch conn req host-info)
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((passwords:gen-dispatcher
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host-info config:access
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(lambda (conn req)
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(dispatch-old conn req host-info)))
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conn req))
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;; dispatch-old: connection request host -> void
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;; NOTE: (GregP) I'm going to use the dispatch logic out of v208 for now.
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;; I will move the other dispatch logic out of the prototype
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;; at a later time.
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(define (dispatch-old conn req host-info)
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(let-values ([(uri method path) (decompose-request req)])
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(cond
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[(conf-prefix? path)
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(cond
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[(string=? "/conf/refresh-servlets" path)
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;; more here - this is broken - only out of date or specifically mentioned
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;; scripts should be flushed. This destroys persistent state!
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(call-with-semaphore config:scripts-lock
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(lambda ()
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(set-box! config:scripts (make-hash-table 'equal))))
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(output-response/method
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conn
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((responders-servlets-refreshed (host-responders host-info)))
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method)]
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[(string=? "/conf/refresh-passwords" path)
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;; more here - send a nice error page
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(hash-table-put! config:access host-info
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(passwords:read-passwords host-info))
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(output-response/method
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conn
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((responders-passwords-refreshed (host-responders host-info)))
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method)]
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[(string=? "/conf/collect-garbage" path)
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(collect-garbage)
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(output-response/method
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conn
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((responders-collect-garbage (host-responders host-info)))
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method)]
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[else
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(output-response/method
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conn
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((responders-file-not-found (host-responders host-info)) uri)
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method)])]
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[(servlet-bin? path)
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(adjust-connection-timeout!
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conn
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(timeouts-servlet-connection (host-timeouts host-info)))
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;; more here - make timeouts proportional to size of bindings
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(servlet-content-producer conn req host-info)]
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[else (file-content-producer conn req host-info)])))
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;; conf-prefix?: string -> (union (listof string) #f)
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;; does the path string have "/conf/" as a prefix?
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(define conf-prefix?
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(let ([conf-re (regexp "^/conf/.*")])
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(lambda (str)
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(regexp-match conf-re str))))
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(define servlet-bin?
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(let ([svt-bin-re (regexp "^/servlets/.*")])
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(lambda (str)
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(regexp-match svt-bin-re str))))
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;; ************************************************************
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;; ************************************************************
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;; SERVING FILES
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;; file-content-producer: connection request host -> void
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(define (file-content-producer conn req host-info)
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(serve-file conn (request-method req) (request-uri req) host-info))
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;; serve-file : connection symbol uri host -> void
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;; to find the file, including searching for implicit index files, and serve it out
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(define (serve-file conn method uri host-info)
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(let ([path (url-path->path (paths-htdocs (host-paths host-info))
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(translate-escapes (url-path->string (url-path uri))))])
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(cond
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[(file-exists? path)
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(output-file conn path method (get-mime-type path))]
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[(directory-exists? path)
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(let loop ([dir-defaults (host-indices host-info)])
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(cond
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[(pair? dir-defaults)
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(let ([full-name (build-path path (car dir-defaults))])
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(if (file-exists? full-name)
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(cond
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[(looks-like-directory? (url-path->string (url-path uri)))
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(output-file conn full-name method (get-mime-type full-name))]
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[else
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(output-slash-message conn method (url-path->string (url-path uri)))])
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(loop (cdr dir-defaults))))]
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[else
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(output-response/method
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conn
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((responders-file-not-found
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(host-responders host-info)) uri)
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method)]))]
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[else
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(output-response/method
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conn ((responders-file-not-found (host-responders host-info))
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uri)
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method)])))
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;; looks-like-directory : str -> bool
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;; to determine if is url style path looks like it refers to a directory
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(define (looks-like-directory? path)
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(eq? #\/ (string-ref path (sub1 (string-length path)))))
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;; output-slash-message: connection symbol string -> void
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;; basically this is just a special error response
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(define (output-slash-message conn method url-path-str)
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(output-response/method
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conn
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(make-response/full
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301 "Moved Permanently"
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(current-seconds)
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TEXT/HTML-MIME-TYPE
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`([Location . ,(string-append url-path-str "/")])
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(list
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(xml->string
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(xexpr->xml
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`(html
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(head (title "Add a Slash"))
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(body "Please use "
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(a ([href ,(string-append
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url-path-str "/")])
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"this url") " instead."))))))
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method))
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;; xml->string: xml -> string
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(define (xml->string some-xml)
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(let ([o-port (open-output-string)])
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(write-xml/content some-xml o-port)
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(get-output-string o-port)))
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;; ************************************************************
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;; ************************************************************
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;; SERVING SERVLETS
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;; servlet-content-producer: connection request host -> void
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(define (servlet-content-producer conn req host-info)
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(let ([meth (request-method req)])
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(if (eq? meth 'head)
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(output-response/method
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conn
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(make-response/full
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200 "Okay" (current-seconds) TEXT/HTML-MIME-TYPE
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'() (list "ignored"))
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meth)
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(let ([uri (request-uri req)])
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(set-request-bindings/raw!
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req
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(read-bindings/handled conn meth uri (request-headers req)
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host-info))
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(cond
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[(continuation-url? uri)
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=> (lambda (k-ref)
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(invoke-servlet-continuation conn req k-ref host-info))]
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[else
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(servlet-content-producer/path conn req host-info uri)])))))
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;; read-bindings/handled: connection symbol url headers host -> (listof (list (symbol string))
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;; read the bindings and handle any exceptions
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(define (read-bindings/handled conn meth uri headers host-info)
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(with-handlers ([exn? (lambda (e)
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(output-response/method
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conn
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;((responders-protocol (host-responders host-info))
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; (exn-message e))
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((responders-servlet-loading (host-responders
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host-info))
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uri e)
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meth)
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'())])
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(read-bindings conn meth uri headers)))
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;; servlet-content-producer/path: connection request host url -> void
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;; This is not a continuation url so the loading behavior is determined
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;; by the url path. Build the servlet path and then load the servlet
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(define (servlet-content-producer/path conn req host-info uri)
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(with-handlers (;; couldn't find the servlet
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[exn:fail:filesystem:exists:servlet?
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(lambda (the-exn)
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(output-response/method
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conn
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((responders-file-not-found (host-responders
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host-info))
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(request-uri req))
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(request-method req)))]
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;; servlet won't load (e.g. syntax error)
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[(lambda (x) #t)
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(lambda (the-exn)
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(output-response/method
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conn
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((responders-servlet-loading (host-responders
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host-info)) uri
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the-exn)
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(request-method req)))])
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(let ([sema (make-semaphore 0)]
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[last-inst (thread-cell-ref current-servlet-instance)])
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(let/cc suspend
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(let* ([servlet-custodian (make-servlet-custodian)]
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[inst (create-new-instance!
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config:instances servlet-custodian
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(make-execution-context
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conn req (lambda () (suspend #t)))
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sema
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(start-timer 0 (lambda () (void))))]
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[real-servlet-path (url-path->path
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(paths-servlet (host-paths host-info))
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(url-path->string (url-path uri)))]
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[servlet-exit-handler (make-servlet-exit-handler inst)])
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(parameterize ([current-directory (get-servlet-base-dir real-servlet-path)]
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[current-custodian servlet-custodian]
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[exit-handler servlet-exit-handler])
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(thread-cell-set! current-servlet-instance inst)
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(let-values (;; timer thread must be within the dynamic extent of
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;; servlet custodian
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[(time-bomb) (start-timer (timeouts-default-servlet
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(host-timeouts host-info))
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(lambda ()
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(servlet-exit-handler #f)))]
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;; any resources (e.g. threads) created when the
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;; servlet is loaded should be within the dynamic
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;; extent of the servlet custodian
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[(servlet-program servlet-namespace) (cached-load real-servlet-path)])
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(parameterize ([current-namespace servlet-namespace])
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(set-servlet-instance-timer! inst time-bomb)
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(with-handlers ([(lambda (x) #t)
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(make-servlet-exception-handler inst host-info)])
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;; Two possibilities:
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;; - module servlet. start : Request -> Void handles
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;; output-response via send/finish, etc.
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;; - unit/sig or simple xexpr servlet. These must produce a
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;; response, which is then output by the server.
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;; Here, we do not know if the servlet was a module,
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;; unit/sig, or Xexpr; we do know whether it produces a
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;; response.
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(let ([r (servlet-program req)])
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(when (response? r)
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(send/back r)))))))))
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(thread-cell-set! current-servlet-instance last-inst)
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(semaphore-post sema))))
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;; make-servlet-exit-handler: servlet-instance -> alpha -> void
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;; exit handler for a servlet
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(define (make-servlet-exit-handler inst)
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(lambda (x)
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(remove-instance! config:instances inst)
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(kill-connection!
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(execution-context-connection
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(servlet-instance-context inst)))
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(custodian-shutdown-all (servlet-instance-custodian inst))))
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;; make-servlet-exception-handler: host -> exn -> void
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;; This exception handler traps all unhandled servlet exceptions
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;; * Must occur within the dynamic extent of the servlet
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;; custodian since several connection custodians will typically
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;; be shutdown during the dynamic extent of a continuation
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;; * Use the connection from the current-servlet-context in case
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;; the exception is raised while invoking a continuation.
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;; * Use the suspend from the servlet-instanct-context which is
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;; closed over the current tcp ports which may need to be
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;; closed for an http 1.0 request.
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;; * Also, suspend will post to the semaphore so that future
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;; requests won't be blocked.
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;; * This fixes PR# 7066
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(define (make-servlet-exception-handler inst host-info)
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(lambda (the-exn)
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(let* ([ctxt (servlet-instance-context inst)]
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[req (execution-context-request ctxt)]
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[resp ((responders-servlet (host-responders
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host-info))
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(request-uri req)
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the-exn)])
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;; Don't handle twice
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(with-handlers ([exn:fail? (lambda (exn) (void))])
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(output-response/method
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(execution-context-connection ctxt)
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resp (request-method req)))
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((execution-context-suspend ctxt)))))
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;; path -> path
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;; The actual servlet's parent directory.
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(define (get-servlet-base-dir servlet-path)
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(let loop ((path servlet-path))
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(let-values ([(base name must-be-dir?) (split-path path)])
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(if must-be-dir?
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(or (and (directory-exists? path) path)
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(loop base))
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(or (and (directory-exists? base) base)
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(loop base))))))
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;; invoke-servlet-continuation: connection request continuation-reference
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;; host -> void
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;; pull the continuation out of the table and apply it
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(define (invoke-servlet-continuation conn req k-ref host-info)
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(with-handlers ([exn:servlet-instance?
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(lambda (the-exn)
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(output-response/method
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conn
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((responders-file-not-found (host-responders
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host-info))
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(request-uri req))
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(request-method req)))]
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[exn:servlet-continuation?
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(lambda (the-exn)
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(output-response/method
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conn
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((responders-file-not-found (host-responders
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host-info))
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(request-uri req))
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(request-method req)))])
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(let* ([last-inst (thread-cell-ref current-servlet-instance)]
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[inst
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(hash-table-get config:instances (first k-ref)
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(lambda ()
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(raise
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(make-exn:servlet-instance
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"" (current-continuation-marks)))))]
|
|
[k-table
|
|
(servlet-instance-k-table inst)])
|
|
(let/cc suspend
|
|
; We don't use call-with-semaphore or dynamic-wind because we
|
|
; always call a continuation. The exit-handler above ensures that
|
|
; the post is done.
|
|
(semaphore-wait (servlet-instance-mutex inst))
|
|
(thread-cell-set! current-servlet-instance inst)
|
|
(set-servlet-instance-context!
|
|
inst
|
|
(make-execution-context
|
|
conn req (lambda () (suspend #t))))
|
|
(increment-timer (servlet-instance-timer inst)
|
|
(timeouts-default-servlet
|
|
(host-timeouts host-info)))
|
|
(let ([k*salt
|
|
(hash-table-get k-table (second k-ref)
|
|
(lambda ()
|
|
(raise
|
|
(make-exn:servlet-continuation
|
|
"" (current-continuation-marks)))))])
|
|
(if (= (second k*salt) (third k-ref))
|
|
((first k*salt) req)
|
|
(raise
|
|
(make-exn:servlet-continuation
|
|
"" (current-continuation-marks))))))
|
|
(thread-cell-set! current-servlet-instance last-inst)
|
|
(semaphore-post (servlet-instance-mutex inst))
|
|
)))
|
|
|
|
;; ************************************************************
|
|
;; ************************************************************
|
|
;; Paul's ugly loading code:
|
|
(define make-cache-entry cons)
|
|
(define cache-entry-servlet car)
|
|
(define cache-entry-namespace cdr)
|
|
|
|
;; cached-load : str -> script, namespace
|
|
;; timestamps are no longer checked for performance. The cache must be explicitly
|
|
;; refreshed (see dispatch).
|
|
(define (cached-load name)
|
|
(let ([e
|
|
(call-with-semaphore config:scripts-lock
|
|
(lambda ()
|
|
(hash-table-get (unbox config:scripts)
|
|
name
|
|
(lambda () (reload-servlet-script name)))))])
|
|
(values (cache-entry-servlet e)
|
|
(cache-entry-namespace e))))
|
|
|
|
;; exn:i/o:filesystem:servlet-not-found =
|
|
;; (make-exn:fail:filesystem:exists:servlet str continuation-marks str sym)
|
|
(define-struct (exn:fail:filesystem:exists:servlet
|
|
exn:fail:filesystem:exists) ())
|
|
|
|
;; reload-servlet-script : str -> cache-entry
|
|
;; The servlet is not cached in the servlet-table, so reload it from the filesystem.
|
|
(define (reload-servlet-script servlet-filename)
|
|
(cond
|
|
[(load-servlet/path servlet-filename)
|
|
=> (lambda (entry)
|
|
; This is only called from cached-load, so config:scripts is locked
|
|
(hash-table-put! (unbox config:scripts)
|
|
servlet-filename
|
|
entry)
|
|
entry)]
|
|
[else
|
|
(raise (make-exn:fail:filesystem:exists:servlet
|
|
(string->immutable-string (format "Couldn't find ~a" servlet-filename))
|
|
(current-continuation-marks) ))]))
|
|
|
|
;; load-servlet/path path -> (union #f cache-entry)
|
|
;; given a string path to a filename attempt to load a servlet
|
|
;; A servlet-file will contain either
|
|
;;;; A signed-unit-servlet
|
|
;;;; A module servlet, currently only 'v1
|
|
;;;;;; (XXX: I don't know what 'typed-model-split-store0 was, so it was removed.)
|
|
;;;; A response
|
|
(define (load-servlet/path a-path)
|
|
(parameterize ([current-namespace (config:make-servlet-namespace)])
|
|
(and (file-exists? a-path)
|
|
(let ([s (load/use-compiled a-path)])
|
|
(cond
|
|
;; signed-unit servlet
|
|
; MF: I'd also like to test that s has the correct import signature.
|
|
[(unit/sig? s)
|
|
(make-cache-entry (lambda (initial-request)
|
|
(invoke-unit/sig s servlet^))
|
|
(current-namespace))]
|
|
; FIX - reason about exceptions from dynamic require (catch and report if not already)
|
|
;; module servlet
|
|
[(void? s)
|
|
(let* ([module-name `(file ,(path->string a-path))]
|
|
[version (dynamic-require module-name 'interface-version)])
|
|
(case version
|
|
[(v1)
|
|
(let ([timeout (dynamic-require module-name 'timeout)]
|
|
[start (dynamic-require module-name 'start)])
|
|
(make-cache-entry
|
|
(lambda (initial-request)
|
|
(adjust-timeout! timeout)
|
|
(start initial-request))
|
|
(current-namespace)))]
|
|
[else
|
|
(raise (format "unknown servlet version ~e" version))]))]
|
|
;; response
|
|
[(response? s)
|
|
(letrec ([go (lambda ()
|
|
(begin
|
|
(set! go (lambda () (load/use-compiled a-path)))
|
|
s))])
|
|
(make-cache-entry (lambda (initial-request) (go))
|
|
(current-namespace)))]
|
|
[else
|
|
(raise 'load-servlet/path "Loading ~e produced ~n~e~n instead of a servlet." a-path s)])))))
|
|
))) |