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#!/usr/bin/csi -s
;;; A tiny little control utility for baresip, written in CHICKEN Scheme.
;;; This won't work out of the box right now, because the port of
;;; netstring to CHICKEN 5 hasn't been published.
;;; Usage:
;;; bscmd COMMAND [parameter-string]
;;; bscmd
;;; With called without arguments, displays the stream of events from baresip.
(import base64 brev (chicken random) json matchable netstring socket)
(define (generate-token) (base64-encode (random-bytes (make-string 9))))
(define (write-object-json-netstring obj . rest) (apply netstring-write (with-output-to-string (fn (json-write obj))) rest))
(define (maybe-cons key value lst)
(if value (cons (cons key value) lst) lst))
(define (send-baresip-command command #!key params port token)
(let ((obj
(maybe-cons 'params params
(maybe-cons 'token token
`((command . ,command))))))
(
(if port
(cut write-object-json-netstring <> port)
write-object-json-netstring)
(list->vector obj))))
(define-options (bscmd bscmd.scm)
'((host
"Hostname or IP address."
(default "localhost")
(single-char #\H)
(value #t))
(port
"Port where baresip is listening."
(default "4444")
(single-char #\p)
(value #t))))
(define (make-socket h p)
(let* ((addrinfo (car (address-information h p)))
(sock (socket (addrinfo-family addrinfo) (addrinfo-socktype addrinfo) (addrinfo-protocol addrinfo))))
(socket-connect sock (addrinfo-address addrinfo)) sock))
(define (json-netstring-read port)
(vector->list (with-input-from-string (netstring-read port) json-read)))
(define (with-baresip-connection proc)
(let ((client-socket (make-socket host (string->number port))))
(call-with-values (fn (socket-i/o-ports client-socket)) proc)))
(define (process-events handler)
(fn
(let loop ()
(when (handler (json-netstring-read x))
(loop)))))
(define (watch-events)
(with-baresip-connection (process-events (fn (print x) #t))))
(define (baresip-transact command params)
(with-baresip-connection
(lambda (inp outp)
(let ((token (generate-token)))
(send-baresip-command
command params: params token: token port: outp)
((process-events
(fn
(if (aand (assoc "token" x) (string=? token (cdr it)))
(begin (print x) #f)
#t))) inp outp)))))
(define (main . ignored-args)
(match (cdr argument-stragglers)
(((? string? command) (? string? params))
(baresip-transact command params))
(((? string? command)) (print (baresip-transact command #f)))
(() (watch-events))
(_ (print "Expected: COMMAND PARAMS"))))
(main)
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