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Complete re-write, thank god.

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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@ -1,28 +1,18 @@
===============================================================================
FACILSERVIL : `Easy Server` Dead-simple, dead-useful.
FACILSERVIL : `Easy Server`
===============================================================================
Sometimes, it's just annoying and time-draining to deal with all of the
intricacies of :usockets-- if, to that, you say something like...
"I just want to write a simple TCP server, dammit!
There's got to be an easier way!"
... then Facilservil is for you!
Facilservil ("easy server") abstracts away the entire server bits, allowing you
to focus on flexibility.
intricacies of :usockets— facilservil abstracts away all of those bits.
----------------------------------------
FEATURES
----------------------------------------
* Multi-user
* Shutdown protection
* Multi-threaded
* Input-handling
* Simple logging system
* Flexibility
* Logging system
* UTF-8
@ -32,25 +22,25 @@ DEMONSTRATION
Load up Facilservil, then run this in your repl:
(facilservil:ex-server 8888)
(facilservil:ex-server "localhost" 8888)
Now, connect your computer on port 8888.
This example server is a chat server, so it might be useful to connect a couple
of times, for demonstration's sake.
Now, connect your computer on port 8888!
If you're on LiGNUx or BSD, you can use "telnet localhost 8888"
It'll show you a pretty example server. :)
In reality, 'ex-server is just a small function for demonstration-- the
example server really looks like this:
(facilservil:server "0.0.0.0" port
'facilservil:connect-ex 'facilservil:disconnect-ex
'facilservil:input-handle-ex)
(facilservil:server host port
#'ex-connect #'ex-disconnect #'ex-input #'ex-loop)
It runs #'connect-ex when you connect, #'disconnect-ex when you disconnect,
and #'input-handle-ex after you finish a command, to handle your input.
It runs #'ex-connect when you connect, #'ex-disconnect when you disconnect,
and #'ex-input-ex after you finish a command, and #'ex-loop after handling
everyone's input (or after timeout of waiting for input).
If you wanna see this example's code (is there a better way to learn?), look
in "/src/ex.lisp".
For a different kind of example (less interesting, since it takes no user
input), look at QOTDD (https://git.eunichx.us/qotdd).
@ -58,93 +48,41 @@ input), look at QOTDD (https://git.eunichx.us/qotdd).
For a more comprehensive guide to Facilservil, look to USAGE, coming right up.
----------------------------------------
USAGE
----------------------------------------
To use Facilservil, just use the `facilservil:server` function somewhere:
(facilservil:server host port
connecting disconnecting input-handler
&key (command-byte 10) (halting 'halt-ex))
To use Facilservil, just use the `facilservil:server` function somewhere.
"host" and "port" are, obviously, the host-IP and port, respectively.
"connecting" is the function that will be executed when a user connects.
"disconnecting" is the function that will run when someone disconnects.
"input-handler" interprets the input of a user, when they complete a command.
"command-byte" is the byte which determines if they've completed a command.
it's 10 by default, which is newline.
"halting" is the function executed when the server shuts down.
"on-connect" is the function that will be executed when a user connects.
"on-disconnect" is the function that will run when someone disconnects.
"on-input" is the function that will run when someone sends a command
"on-loop" is the function running when all input is complete/timeouts
Basically, you write the "connecting", "disconnecting", and "input-handler"
functions (maybe "halting"), and you've got a handy-dandy server.
These functions you write must accept the following arguments:
connecting (socket client-id)
disconnecting (socket client-id)
input-handler (socket client-id input-string)
halting ()
Let's say that you want to write a connecting function which sends a friendly
"welcome" message. You'd do that like this, just about:
(defun my-connecting-function (socket client-id)
(client-write socket
(format nil "Hey, welcome to this server, ~A! <3" client-id)
'T))
This will write to the connecting user's socket (which is passed to your
function), "Hey, welcome to this server," followed by their client-id.
Every user, upon connection, is given a client ID number which is correlated
with their connection socket. This ID number is random, and can be up to
999999 in value.
To send a message to a user, get their socket, and run
(facilservil:client-write socket string &optional newline)
"newline", which defaults to nil, determines whether or not your message is
followed with a newline.
I'll give you one more quick example-- then you'll probably get usage.
Let's write a quick input handler.
(defun my-input-handler (socket client-id input-string)
(if (equal input-string "Hello")
(facilservil:client-write socket "And hi to you!" 't)
(facilservil:client-write socket "You won't even say hi?" 'T)))
It should be pretty self-explanatory.
You just scale up from them-- write a nice command parser or something, and
you're on your way! :)
Now, one more thing: to run the server with your new functions, just do this:
(facilservil:server host port
'my-connecting-function 'facilservil:disconnect-ex
'my-input-handler)
on-connect (connection connection-list)
on-disconnect (connection connection-list)
on-input (connection input-string connection-list)
on-loop (connection-list)
TIP: When it comes to user data, you might want to use a hash-table or two which
correlate client-ids and user data. ^_^
You can use #'send to send strings to a given connection.
Each connection has a built-in hashtable (for storing user-IDs, usernames,
whatever you need). You can store/set a variable with #'bury, and retrieve with
#'dig.
----------------------------------------
NON-FEATURES (TODO)
----------------------------------------
* Ctrl-C etc will crash servers
* Some UTF characters don't go over well
* Internationalization should be supported--
right now, logs etc are always in English.
Not cool.
* You should be able to log to a file.
----------------------------------------
BORING STUFF
----------------------------------------
License is in COPYING (GNU GPLv3)
Based on Trout's server.
Author is Jaidyn Ann <jadedctrl@teknik.io>
Sauce is at https://git.eunichx.us/facilservil
Sauce is at https://git.eunichx.us/facilservil.git

15
facilservil.asd
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@ -1,16 +1,7 @@
(defsystem "facilservil"
:version "0.2"
:version "1.0"
:author "Jaidyn Lev <jadedctrl@teknik.io>"
:license "CC0"
:depends-on ("usocket" "trivial-utf-8" "alexandria" "nih")
:components ((:module "src"
:components
((:file "package")
(:file "meta")
(:file "io")
(:file "ex")
(:file "client")
(:file "server"))))
:depends-on ("usocket" "flexi-streams" "bordeaux-threads")
:components ((:file "facilservil"))
:description
"Simple TCP/telnet server for Lisp.")

312
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@ -0,0 +1,312 @@
;; facilservil.lisp
;; A simple lib for making a TCP server.
;; Based on a server by Trout,
;; https://gist.github.com/traut/6bf71d0da54493e6f22eb3d00671f2a9
;; which is in turn inspired by
; https://gist.github.com/shortsightedsid/71cf34282dfae0dd2528
; https://gist.github.com/shortsightedsid/a760e0d83a9557aaffcc
; http://mihai.bazon.net/blog/howto-multi-threaded-tcp-server-in-common-lisp
(defpackage :facilservil
(:use :cl)
(:export :server :ex-server
:send :recieve
:dig :bury
:close-it
:get-ip
:socket→con
:logger))
(in-package :facilservil)
;; —————————————————————————————————————
;; CLASSES
(defclass connection ()
((socket :accessor con→socket :initarg :socket)
(data :initform (make-hash-table :test #'equal) :initarg :data)))
;; —————————————————————————————————————
;; MACROS
;; LIST-OF-CONNECTIONS CONNECTION FUNCTION FUNCTION → NIL
(defmacro old-activity (all-connections con on-input on-disconnect)
"Macro for #'server, for handling client activity."
`(bordeaux-threads:make-thread
(lambda ()
(handler-case
(process-con-activity ,con ,all-connections ,on-input)
(t (e)
(logger "Error during processing ~a" e)
(setf ,all-connections (delete ,con ,all-connections))
(funcall ,on-disconnect ,con ,all-connections)
(close-it ,con))))))
;; LIST-OF-CONNECTIONS CONNECTION FUNCTION
(defmacro new-connection (all-connections master-con on-connect)
"Macro for #'server, for handling new connections."
`(let* ((new-socket
(usocket:socket-accept (con→socket ,master-con) :element-type 'character))
(new-con
(make-instance 'connection :socket new-socket)))
(logger "New connection from ~A" (get-ip new-con))
(push new-con ,all-connections)
(funcall on-connect new-con ,all-connections)))
;; —————————————————————————————————————
;; SERVER
;; STRING NUMBER [:FUNCTION :FUNCTION :FUNCTION] → NIL
(defun server (host port &key (on-connect #'blank) (on-input #'blank)
(on-disconnect #'blank) (on-loop #'blank))
"Starts server on given host at given port; and executes the given functions
(with connection/connections/input as arguments) according to their triggers.
This is the function you want to use.
Look at #'ex-*, the example server, for example of use."
(let* ((master-socket (usocket:socket-listen host port :backlog 256))
(master-con (make-instance 'connection :socket master-socket))
(all-connections `(,master-con)))
(loop
(loop for con in (wait-for-input all-connections)
do (if (eq con master-con)
(new-connection all-connections master-con on-connect)
(old-activity all-connections con on-input on-disconnect)))
(funcall on-loop all-connections))))
;; STRING NUMBER → THREAD
(defun server-in-thread (host port)
"Run the TCP server in a seperate thread."
(let ((thread-name (format nil "facilservil")))
(logger "Starting server in a separate thread:'~a'" thread-name)
(bordeaux-threads:make-thread
(lambda () (server host port))
:name thread-name)))
;; —————————————————————————————————————
;; CONNECTION I/O
(defgeneric send (target message &rest args)
(:documentation "Send a given message to a target user."))
;; CONNECTION VARYING → NIL
(defmethod send ((con connection) message &rest args)
(apply 'send (append (list (con→socket con) message) args)))
;; STREAM-USOCKET VARYING → NIL
(defmethod send ((socket usocket::stream-usocket) message &rest args)
(let ((sstream (usocket:socket-stream socket)))
(apply 'format (append (list sstream message) args))
;; (format sstream (format nil (format nil "~A" message)))
(force-output sstream)))
;; STREAM-SERVER-USOCKET VARYING → NIL
(defmethod send ((s usocket::stream-server-usocket) a &rest d) nil)
;; LIST-OF-SOCKETS/CONNECTIONS VARYING → NIL
(defmethod send ((sockets list) message &rest args)
(mapcar (lambda (socket)
(apply 'send (append (list socket message) args))) sockets))
;; —————————————————
(defgeneric recieve (target)
(:documentation "Recieve a string from a given target."))
;; CONNECTION → STRING
(defmethod recieve ((con connection))
(recieve (con→socket con)))
;; STREAM-USOCKET → STRING
(defmethod recieve ((socket usocket::stream-usocket))
(string-sanitize (read-line (usocket:socket-stream socket))))
;; STREAM-SERVER-USOCKET → NIL
(defmethod recieve ((socket usocket::stream-server-usocket)) nil)
;; —————————————————————————————————————
;; CONNECTION STORAGE
;; CONNECTION STRING → VARYING
(defun dig (connection variable)
"Get the value of a variable from the connection's hashtable."
(gethash variable (slot-value connection 'data)))
;; CONNECTION STRING VARYING → VARYING
(defun bury (connection variable value)
"Set the value of a variable in the connection's hashtable."
(setf (gethash variable (slot-value connection 'data)) value))
;; —————————————————————————————————————
;; CONNECTION MANAGEMENT
;; SOCKET → NIL
(defun process-con-activity (con connection-list on-input)
"Process client socket that got some activity"
(let ((message (recieve con)))
(logger "~A: ~A" (get-ip con) message)
(funcall on-input con message connection-list)))
;; —————————————————
(defgeneric close-it (target con-list on-disconnect)
(:documentation "Shut down a target's connection, forcefully.
Run the disconnect function as well."))
;; CONNECTION LIST-OF-CONNECTIONS FUNCTION
(defmethod close-it ((con connection) connection-list on-disconnect)
(close (con→stream con) connection-list on-disconnect))
;; STREAM-USOCKET LIST-OF-CONNECTIONS FUNCTION
(defmethod close-it ((socket usocket:stream-usocket) connection-list on-disconnect)
(funcall on-disconnect socket connection-list)
(handler-case
(usocket:socket-close socket)
(error (e)
(logger "Ignoring the error from closing connection: ~a" e)))
(logger "Connection closed: ~A" con))
;; —————————————————
;; SOCKET LIST-OF-CONNECTIONS → CONNECTION
(defun socket→con (socket connections)
"Return the connection— from a list of them— that matches the given socket."
(loop :for con :in connections
:if (eq (con→socket con) socket)
:return con))
;; —————————————————
;; LIST-OF-CONNECTIONS → LIST-OF-READY-CONNECTIONS
(defun wait-for-input (connections)
"Basically a wrapper around #'usocket:wait-for-input, but for connections
rather than stream-usocket objects."
(let ((sockets (mapcar #'con→socket connections)))
(mapcar (lambda (socket) (socket→con socket connections))
(usocket:wait-for-input sockets :timeout 10 :ready-only 'T))))
;; —————————————————————————————————————
;; LOGGING, ETC
;; STRING … ARG → NIL
(defun logger (text &rest args)
"Simple wrapper around format func to simplify logging."
(apply 'format (append (list t (concatenate 'string text "~%")) args)))
;; —————————————————————————————————————
;; CONNECTION METADATA
(defgeneric server-p (target)
(:documentation "Return if a given item's the server's connection/socket."))
;; USOCKET → BOOL
(defmethod server-p ((socket usocket::usocket))
(eq (type-of socket) 'usocket:stream-server-usocket))
;; CONNECTION → BOOL
(defmethod server-p ((con connection))
(server-p (con→socket con)))
;; —————————————————
(defgeneric get-ip (target)
(:documentation "Return the IP address of a given socket/connection."))
;; CONNECTION → IP
(defmethod get-ip ((con connection))
(get-ip (con→socket con)))
;; STREAM-USOCKET → IP
(defmethod get-ip ((socket usocket::stream-usocket))
(usocket:get-peer-address socket))
;; —————————————————————————————————————
;; MISC
;; STRING → STRING
(defun string-remove-octets (string &rest restricted-octs)
"Remove characters from a string matching any passed 'restricted' octet."
(let ((octets (flexi-streams:string-to-octets string :external-format :utf-8)))
(mapcar (lambda (octet) (setq octets (remove octet octets))) restricted-octs)
(flexi-streams:octets-to-string octets :external-format :utf-8)))
;; NUMBER NUMBER → LIST
(defun range (start end)
"Return whole numbers between start and end, inclusive."
(loop :for i :from start :to end :collect i))
(defun string-sanitize (string)
(string-remove-octets string 12 13 14 15))
;; VARYING … → NIL
(defun blank (&rest ignored)
"Literal nothing. Used as a default for #'server, so that one can ommit
any given trigger, if they want."
nil)
;; —————————————————————————————————————
;; EXAMPLE SERVER
;; This is a general outline of any server using facilservil.
;; Four functions for each type of trigger (connection, disconnection, input,
;; loop), passed to the #'facilservil:server function.
;; If you can't tell, it's a simple chat server!
;; STRING NUMBER
(defun ex-server (host port)
"Wrapping up the example-server for convenience."
(server host port
:on-connect #'ex-connect :on-disconnect #'ex-disconnect
:on-input #'ex-input :on-loop #'ex-loop))
;; CONNECTION LIST-OF-CONNECTIONS → NIL
(defun ex-connect (con con-list)
"Executed whenever a client connects."
(bury con "id-number" (random 9999))
(send con "Welcome to facila example! ♥~%")
(send con "Users online now—~%")
(mapcar (lambda (acon) (send con "~A, " (dig acon "id-number"))) con-list)
(send con "~%~%")
(send con-list
(format nil "~A just joined as ~A!~%"
(get-ip con) (dig con "id-number"))))
;; CONNECTION LIST-OF-CONNECTIONS → NIL
(defun ex-disconnect (con con-list)
"Executed whenever a client disconnects."
(send con-list (format nil "~A just died~%" (dig con "id-number"))))
;; CONNECTION STRING LIST-OF-CONNECTIONS → NIL
(defun ex-input (con input con-list)
"Executed on a connection + it's input."
(send (remove con con-list) "~A: ~A~%" (dig con "id-number") input))
;; LIST-OF-CONNECTIONS → NIL
(defun ex-loop (con-list)
"Executed after input taken, or after #'wait-until-input timeout
(so maximum, every 10 seconds)."
nil)

119
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@ -1,119 +0,0 @@
(in-package :facilservil)
;: SOCKET --> STRING
(defun make-socket-id (socket)
"Create a socket-id from a socket."
(format nil "~A" socket))
;; NIL --> NUMBER
(defun make-client-id ()
"Generate a new client ID."
(random 999999))
;; STRING --> STRING
(defun client-data-id (client-id data)
"Make an 'input ID' from a client-id."
(format nil "~A-~A" client-id data))
;; -------------------------------------
;; SOCKET --> NUMBER
(defun socket-to-client (socket)
"Return the client of a socket."
(cadr (socket-pair socket)))
;; NUMBER --> SOCKET
(defun client-to-socket (client)
"Return the socket of a client."
(car (client-pair client)))
;; NUMBER --> LIST
(defun client-pair (client)
"Return the '(socket client) pair of a client."
(nih:getf-cadr *socket-client* client))
;; SOCKET --> LIST
(defun socket-pair (socket)
"Return the '(socket client) pair of a socket."
(nih:getf-car *socket-client* socket))
;; -------------------------------------
;; NUMBER STRING DATA --> NIL
(defun client-data-set (client data value)
"Set a piece of a `client`'s `data` to `value`."
(setf
(gethash (client-data-id client data) *client-data*)
value))
;; NUMBER STRING --> ???
(defun client-data-get (client data)
"Get the value of a client's `data` from *client-data*."
(gethash (client-data-id client data) *client-data*))
;; NUMBER STRING --> NIL
(defun client-data-rem (client data)
"Remove a piece of client's `data` from *client-data*."
(remhash (client-data-id client data) *client-data*))
;; -------------------------------------
;; SOCKET --> NIL
(defun socket-register (socket)
"Register a new socket; add their data to globals, log it, etc."
(let* ((client-id (make-client-id)))
(setq *socket-list* (concatenate 'list *socket-list* (list socket)))
(setq *socket-client* (concatenate 'list *socket-client*
(list (list socket client-id))))
(setq *csocket-list* (concatenate 'list *csocket-list*
(list socket)))
(setq
*client-list* (concatenate 'list *client-list*
(list client-id)))
(client-data-set client-id "input" '())
(journal (format nil "Client ~A has connected!" client-id) "Connect")))
;; -------------------------------------
;; NUMBER --> NIL
(defun client-slaughter (client)
"Clean up data from client, and disconnect their socket."
(socket-slaughter (client-to-socket client)))
;; SOCKET --> NIL
(defun socket-slaughter (socket)
"Clean up data from a client, and disconnect their socket."
(let* ((client-id (socket-to-client socket)))
(client-data-rem client-id "input")
(setq *socket-client* (delete (socket-pair socket) *socket-client*))
(setq *socket-list* (delete socket *socket-list*))
(setq *client-list* (delete client-id *client-list*))
(setq *csocket-list* (delete socket *csocket-list*))
(usocket:socket-close socket)
(journal
(format nil "Client ~A has disconnected." client-id)
"Disconnect")))

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@ -1,60 +0,0 @@
(in-package :facilservil)
(defun connect-ex (socket client-id)
"Example connection handler-- sends a friendly welcome message!"
(client-write client-id
(format nil "Hey, welcome to this server, ~A! <3" client-id)
'T))
(defun disconnect-ex (socket client-id)
"Example disconnection handler-- tells the world, for some reason."
(client-broadcast
(format nil "~%~A's just run away... </3~%" client-id)
'T))
(defun input-handle-ex (socket client-id input-string)
"Example input-handler. Reverses user input and sends it back at them!"
(if (< 0 (length input-string))
(let* ((reversed-input
(nih:char-string (reverse (nih:char-list input-string))))
(output-string
(nih:string-combine
(format nil "Sorry, I didn't hear that quite right.~%")
(format nil "Did you say, \"~A?\"" reversed-input))))
(client-write client-id output-string 'T))))
(defun halt-ex ()
"Example (and default) halt-handler-- send halt messages to everyone."
(journal "Sending halt messages..." "Halt")
(ignore-errors (client-broadcast
(format nil "~%Server shutting down! </3~%"))))
(defun reboot-ex ()
"Example (and default) reboot-handler-- send reboot messages to everyone."
(journal "Sending reboot messages..." "Reboot")
(ignore-errors (client-broadcast
(format nil "~%Server restarting now! ^-^~%"))))
;; -------------------------------------
;; NUMBER --> NIL
(defun ex-server (port)
"Start a server-instance with the built-in example functions.
Demonstration purposes only!"
(server "0.0.0.0" port 'connect-ex 'disconnect-ex 'input-handle-ex))

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(in-package :facilservil)
;; -------------------------------------
;; SOCKET I/O
;; SOCKET --> NIL
(defun socket-read (socket)
"Read new input from a client socket to its `stack` list of bytes."
(let* ((client-id (socket-to-client socket))
(input-stack (client-data-get client-id "input")))
(client-data-set
client-id "input"
(concatenate 'list input-stack
(list (read-byte (usocket:socket-stream socket)))))))
;; SOCKET LIST/ARRAY --> NIL
(defun socket-write-bytes (socket bytes)
"Write bytes to a client socket."
(let ((sstream (usocket:socket-stream socket))
(i 0))
(loop
:while (< i (length bytes))
:do
(cond ((listp bytes)
(write-byte (nth i bytes) sstream))
((arrayp bytes)
(write-byte (aref bytes i) sstream)))
(setq i (+ i 1)))
(force-output sstream)))
;; SOCKET STRING [BOOLEAN] --> NIL
(defun socket-write (socket string &optional (line-break nil))
"Writes a string to a socket-- w/o line-break, by default."
(socket-write-bytes
socket
(ignore-errors
(babel:string-to-octets
(if line-break
(format nil "~A~%" string)
string)
:encoding :utf-8))))
;; STRING [BOOLEAN] [SOCKET] --> NIL
(defun socket-broadcast (string &optional (line-break nil) (exception nil))
"Writes a `string` to all client sockets (aside from an `exception`)."
(client-broadcast string line-break
(socket-to-client exception)))
;; SOCKET --> NIL
(defun socket-input-flush (socket)
"Clean all input from a socket."
(let ((client-id (socket-to-client socket)))
(client-data-set client-id "input" '())))
;; SOCKET --> STRING
(defun socket-input-string (socket)
"Get input from a socket as a string."
(client-input-string (socket-to-client socket)))
;; -------------------------------------
;; CLIENT I/O
;; NUMBER --> NIL
(defun client-read (client)
"Read new input from a client to their stack of input bytes."
(socket-read (client-to-socket client)))
;; NUMBER LIST --> NIL
(defun client-write-bytes (client bytes)
"Write bytes to a client's socket."
(format t "CLIENT-TO-SOCKET: " (client-to-socket client))
(socket-write-bytes (client-to-socket client) bytes))
;; NUMBER STRING [BOOLEAN] --> NIL
(defun client-write (client string &optional (line-break nil))
"Writes a string to a client's socket-- w/o line-break, default."
(socket-write (client-to-socket client) string line-break))
;; NUMBER --> NIL
(defun client-input-flush (client)
"Clean up input from a client."
(socket-input-flush (client-to-socket client)))
;; STRING [BOOLEAN] [SOCKET] --> NIL
(defun client-broadcast (string &optional (line-break nil) (exception nil))
"Writes a `string` to all client sockets (aside from an `exception`-- w/o line-break, by default."
(mapcar
(lambda (client)
(if (not (eq client exception))
(client-write client string line-break)))
*client-list*))
;; NUMBER --> STRING
(defun client-input-string (client)
"Get input from a client as a string."
(let* ((input-bytes (client-data-get client "input"))
(sanitized-bytes (remove-newline-bytes input-bytes))
(byte-vector (list-to-byte-vector sanitized-bytes)))
(if sanitized-bytes
(ignore-errors (babel:octets-to-string byte-vector :encoding :utf-8))
"")))
(defun list-to-byte-vector (list)
(make-array (list (length list))
:initial-contents list
:element-type '(unsigned-byte 8)))
;; -------------------------------------
;; SOCKET --> BOOLEAN
(defun socket-connectp (socket)
"Return whether or not a socket is still connected."
(listen (usocket:socket-stream socket)))
;; -------------------------------------
;; MISC.
;; LIST --> LIST
(defun remove-newline-bytes (bytes)
"Remove undesired bytes-- null, LF, CR, etc, from a list of bytes."
(remove 0 (remove 10 (remove 13 bytes))))
;; SOCKET
(defun commandp (byte-list command-byte)
"Returns whether or not a command is complete, judging on it's bytes."
(let* ((last-byte (car (last byte-list))))
(eq command-byte last-byte)))

58
src/meta.lisp
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(in-package :facilservil)
;; DATA [STRING] --> STRING
(defun journal (data &optional (name "unnamed") (second-name "-"))
"Print out a piece of data for logging on stdout."
(format t "~A | ~A | ~A | ~A~%"
(string-date (get-universal-time))
(force-string-length name 10)
(force-string-length second-name 10)
data))
(defun standard-journaling ())
;; -------------------------------------
(defun string-date (universal-time)
(multiple-value-bind (second minute hour day month year)
(decode-universal-time universal-time)
(nih:string-combine
(nih:string-combine year (make-digits month 2) (make-digits day 2)
:seperator "-")
" "
(nih:string-combine (make-digits hour 2) (make-digits minute 2)
(make-digits second 2) :seperator ":"))))
(defun make-digits (string number)
(nih:min-string-length string number :prefix "0"))
;; LIST --> STRING
(defun print-bytes (bytes)
"Print a list of (UTF-8) bytes as a string to stdout."
(if bytes
(format t "~A"
(ignore-errors (babel:octets-to-string bytes :encoding :utf-8)))))
;; STRING NUMBER [STRING} --> STRING
(defun force-string-length (string desired-length &key (prefix "") (suffix " "))
"Force a string to be of a certain length-- by whatever means necessary!"
(cond
((< (length string) desired-length)
(nih:min-string-length string desired-length :suffix suffix :prefix prefix))
((< desired-length (length string))
(nih:line-car (nih:max-string-length string desired-length)))
((eq (length string) desired-length)
string)
(nih:min-string-length string desired-length :suffix suffix)))

54
src/package.lisp
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(defpackage :facilservil
(:use :cl)
(:nicknames :fs)
(:export
*socket-client*
*socket-list*
*csocket-list*
*client-list*
*client-data*
:journal
:client-write
:cline-write-bytes
:client-broadcast
:client-read
:client-slaughter
:socket-write
:socket-write-bytes
:socket-broadcast
:socket-read
:socket-register
:socket-slaughter
:client-data-get
:client-data-set
:client-data-rem
:socket-to-client
:client-to-socket
:connect-ex
:disconnect-ex
:input-handle-ex
:halt-ex
:reboot-ex
:ex-server
:server-shutdown
:server-reboot
:strequal
:server))
(in-package :facilservil)
(rename-package :trivial-utf-8 :trivial-utf-8 (list :tu8))

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src/server.lisp
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(in-package :facilservil)
;; -------------------------------------
;; GLOBAL VARIABLES
(defvar *socket-client* '())
(defvar *client-list* '())
(defvar *client-data* '())
(defvar *socket-list* '())
(defvar *csocket-list* '())
(defun reset-globals ()
"Set all global variables to default state."
(setq *socket-client* '()) ;; list correlating client IDs and sockets
(setq *client-list* '()) ;; list of client (ID numbers)
(setq *client-data* (make-hash-table :test 'equal))
(setq *socket-list* '()) ;; all sockets
(setq *csocket-list* '())) ;; all sockets except for master socket
;; -------------------------------------
;; STRING NUMBER CHARACTER FUNCTION-NAME FUNCTION-NAME FUNCTION-NAME --> NIL
(defun server
(host port connecting disconnecting input-handler
&key (command-byte 10) (halting 'halt-ex) (init 'blank))
"Runs the basic server on `host`:`port`, running `connecting` when a new
client connects, `disconnecting` when one disconnects, and `input-handler`
when the byte `command-byte` is recieved as input.
The three user-provided functions must take the following two arguments:
(socket client-id)
The exception, `input-handler`, takes three arguments:
(socket client-id client-input-string)
Inspired by
http://mihai.bazon.net/blog/howto-multi-threaded-tcp-server-in-common-lisp"
(let* ((master-socket
(usocket:socket-listen host port
:reuse-address 'T
:element-type '(unsigned-byte 8))))
(reset-globals)
(setq *socket-list* (list master-socket))
(funcall init)
(unwind-protect
(loop
(loop
:for socket
:in (usocket:wait-for-input *socket-list* :ready-only 'T)
:do
(cond
;; if new connection...
((eq socket master-socket)
(let ((new-socket (usocket:socket-accept socket)))
;; add data to client-pairs, socket-pairs, client-data vv
(socket-register new-socket)
;; execute user-provided #'connecting ^-^
(funcall connecting new-socket (socket-to-client new-socket))))
;; ...if functioning old connection...
((socket-connectp socket)
(progn (socket-read socket)
;; check if command is complete-- if so, use user-provided
;; input-handler.
(let* ((client-id (socket-to-client socket))
(client-bytes (client-data-get client-id "input"))
(client-input (client-input-string client-id)))
;; if reached *command-byte*, handle and flush input
(if (commandp client-bytes command-byte)
(progn
(funcall input-handler socket client-id client-input)
(socket-input-flush socket))))))
;; ...if EOF connection or error... </3
('T
;; execute user-provided #'disconnecting ;-;
(funcall disconnecting socket (socket-to-client socket))
(socket-slaughter socket))))
;; now, let's write that shit down
(standard-journaling))
;; unwind-protect's cleanup form:
;; if error, shut down gracefully.
(progn
(funcall halting)
(server-shutdown)))))
;; -------------------------------------
(defun server-shutdown ()
"Shut down the server and close all connections."
(journal "Shutting down server..." "Halt")
(ignore-errors (mapcar #'usocket:socket-close *socket-list*)))
;; STRING NUMBER
(defun server-reboot
(host port connecting disconnecting input-handler command-byte halting)
"Shut down the server, then start it again."
(journal "Server stopping..." "Reboot")
(server-shutdown)
(journal "Server starting..." "Reboot")
(server host port connecting disconnecting input-handler
:command-byte command-byte
:halting halting))
(defun blank ())