TODO update.

[doldaconnect.git] / lib / guile / hubmgr

#!/usr/bin/guile -s
!#

(use-modules (dolcon ui) (dolcon util))
(use-modules (ice-9 format))

(define max-hubs 6)
(define hub-list '())
(define hl-file (string-append (getenv "HOME") "/.hublist"))
(define hublist '())
(define connlist '())
(define statelist '())

(define (logf . args)
  (let ((fmt (car args)) (args (cdr args)))
    (apply format (cons* #t (string-append fmt "~%") args))))

(define (list-delta l1 l2)
  (let ((r1 '()) (r2 '()))
    (for-each (lambda (o1)
		(catch 'found
		       (lambda ()
			 (for-each (lambda (o2)
				     (if (equal? o1 o2) (throw 'found o2)))
				   l2)
			 (set! r2 (cons o1 r2)))
		       (lambda (sig ret)
			 (set! r1 (cons (cons o1 ret) r1))
			 (set! l2 (delq ret l2)))))
	      l1)
    (list r1 r2 l2)))

(define (read-hl)
  (catch 'system-error
	 (lambda () 
	   (let ((p (open-input-file hl-file)))
	     (catch 'eof
		    (lambda ()
		      (let ((lines '()))
			(while #t
			       (let ((line (read-line p)))
				 (if (eof-object? line)
				     (throw 'eof lines)
				     (let ((lexed (dc-lexsexpr line)))
				       (if (> (length lexed) 0)
					   (set! lines (append lines (list lexed))))))))))
		    (lambda (s a) (close-port p) a))))
	 (lambda (key . args)
	   '())))

(define (cklist)
  (set! statelist (let ((nl '()) (ct (current-time)))
		    (for-each (lambda (o)
				(if (< ct (+ (cadr o) (caddr o)))
				    (set! nl (cons o nl))))
			      statelist)
		    nl))
  (for-each (lambda (o)
	      (if (and (not (assq o connlist))
		       (not (assq o statelist)))
		  (begin (logf "connecting to ~a" (cadr o))
			 (set! connlist (cons (cons o 'pend) connlist))
			 (dc-qcmd (list* "cnct" o)
				  (let ((hub o))
				    (lambda (resp)
				      (let ((er (dc-extract resp)) (ir (dc-intresp resp)))
					(if (= (cdr (assq 'code er)) 200)
					    (begin (set-cdr! (assq hub connlist) (car ir))
						   (logf "~a state syn (~a)" (cadr hub) (car ir)))
					    (begin (set! connlist (delq (assq hub connlist) connlist))
						   (set! statelist (cons (list hub (current-time) 10) statelist))
						   (logf "~a failed (~a)" (cadr hub) (cdr (assq 'code er))))))))))))
	    hublist))

(define (hubmgr-main args)
  (let ((dc-server #f))
    (set! hublist (read-hl))
    (logf "read ~a hubs" (length hublist))
    (dc-c&l #t dc-server #t)
    (dc-ecmd-assert 200 "notify" "fn:act" "on")
    (dc-handle-fn)
    (dc-fnproc-reg 'state (lambda (fn)
			    (if (and (eq? (cdr (assq 'state fn)) 'dead)
				     (assq (cdr (assq 'id fn)) (map (lambda (o) (cons (cdr o) (car o))) connlist)))
				(begin (logf "~a died" (cdr (assq 'id fn)))
				       (dc-qcmd (list "dcnct" (cdr (assq 'id fn))))))
			    (cklist)))
    (dc-fnproc-reg 'dstr (lambda (fn)
			   (let ((clf (assq (cdr (assq 'id fn)) (map (lambda (o) (cons (cdr o) (car o))) connlist))))
			     (if clf
				 (let ((hlf (cdr clf)))
				   (logf "~a disappeared" (cadr hlf))
				   (set! connlist (delq (assq hlf connlist) connlist))
				   (set! statelist (cons (list hlf (current-time) 10) statelist)))))
			   (cklist)))
    (dc-loop-reg ".periodic" #f cklist)
    
    (cklist)
    (dc-loop)))

(setlocale LC_ALL "")
(hubmgr-main (command-line))