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processmod.scm at [1e545a3411]
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File processmod.scm artifact f591b3597d part of check-in 1e545a3411


;;======================================================================
;; Copyright 2017, Matthew Welland.
;; 
;; This file is part of Megatest.
;; 
;;     Megatest is free software: you can redistribute it and/or modify
;;     it under the terms of the GNU General Public License as published by
;;     the Free Software Foundation, either version 3 of the License, or
;;     (at your option) any later version.
;; 
;;     Megatest is distributed in the hope that it will be useful,
;;     but WITHOUT ANY WARRANTY; without even the implied warranty of
;;     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;     GNU General Public License for more details.
;; 
;;     You should have received a copy of the GNU General Public License
;;     along with Megatest.  If not, see <http://www.gnu.org/licenses/>.

;;======================================================================

(declare (unit processmod))
;; (declare (uses mtver))
(declare (uses debugprint))
;; (declare (uses stml2))
;; (declare (uses pkts))

(module processmod
	*
	
(import scheme
	chicken.base
 	chicken.condition
 	chicken.file
;; 	chicken.time
;; 	chicken.file.posix
 	chicken.pathname
;; 	chicken.port
 	chicken.process
 	chicken.process-context
 	chicken.process-context.posix
 	chicken.process.signal
;; 	chicken.pretty-print
;; 	chicken.random
 	chicken.io
 	chicken.string
;; 	chicken.sort
;; 	chicken.time.posix
;; 	
;; 	(prefix base64 base64:)
;; 	(prefix sqlite3 sqlite3:)
	directory-utils
;; 	matchable
;; 	md5
;; 	message-digest
 	regex
;; 	regex-case
;; 	sparse-vectors
 	srfi-1
;; 	srfi-13
 	srfi-18
 	srfi-69
;; 	system-information
;; 	typed-records
;; 	z3
;; 
;; 	mtver
 	debugprint
;; 	stml2
;; 	pkts
	)

;;======================================================================
;; Process convience utils
;;======================================================================

;;======================================================================
;; accept an alist or hash table containing envvar/env value pairs (value of #f causes unset) 
;;   execute thunk in context of environment modified as per this list
;;   restore env to prior state then return value of eval'd thunk.
;;   ** this is not thread safe **
(define (common:with-env-vars delta-env-alist-or-hash-table thunk)
  (let* ((delta-env-alist (if (hash-table? delta-env-alist-or-hash-table)
                              (hash-table->alist delta-env-alist-or-hash-table)
                              delta-env-alist-or-hash-table))
         (restore-thunks
          (filter
           identity
           (map (lambda (env-pair)
                  (let* ((env-var     (car env-pair))
                         (new-val     (let ((tmp (cdr env-pair)))
                                        (if (list? tmp) (car tmp) tmp)))
                         (current-val (get-environment-variable env-var))
                         (restore-thunk
                          (cond
                           ((not current-val) (lambda () (unset-environment-variable! env-var)))
                           ((not (string? new-val)) #f)
                           ((eq? current-val new-val) #f)
                           (else 
                            (lambda () (set-environment-variable! env-var current-val))))))
                    ;;(when (not (string? new-val))
                    ;;    (debug:print 0 *default-log-port* " PROBLEM: not a string: "new-val"\n from env-alist:\n"delta-env-alist)
                    ;;    (pp delta-env-alist)
                    ;;    (exit 1))
                        
                    
                    (cond
                     ((not new-val)  ;; modify env here
                      (unset-environment-variable! env-var))
                     ((string? new-val)
                      (set-environment-variable! env-var new-val)))
                    restore-thunk))
                delta-env-alist))))
    (let ((rv (thunk)))
      (for-each (lambda (x) (x)) restore-thunks) ;; restore env to original state
      rv)))

;;  (use regex directory-utils)
;;  (declare (unit process))

(define (process:conservative-read port)
  (let loop ((res ""))
    (if (not (eof-object? (peek-char port)))
	(loop (conc res (read-char port)))
	res)))

(define (process:cmd-run-with-stderr->list cmd . params)
  ;; (print "Called with cmd=" cmd ", proc=" proc ", params=" params)
;;  (handle-exceptions
;;   exn
;;   (begin
;;     (print "ERROR:  Failed to run command: " cmd " " (string-intersperse params " "))
;;     (print "       " ((condition-property-accessor 'exn 'message) exn))
;;     #f)
   (let-values (((fh fho pid fhe) (if (null? params)
				      (process* cmd)
				      (process* cmd params))))
       (let loop ((curr (read-line fh))
		  (result  '()))
	 (let ((errstr (process:conservative-read fhe)))
	   (if (not (string=? errstr ""))
	       (set! result (append result (list errstr)))))
       (if (not (eof-object? curr))
	   (loop (read-line fh)
		 (append result (list curr)))
	   (begin
	     (close-input-port fh)
	     (close-input-port fhe)
	     (close-output-port fho)
	     result))))) ;; )

(define (process:cmd-run-with-stderr-and-exitcode->list cmd . params)
  ;; (print "Called with cmd=" cmd ", proc=" proc ", params=" params)
;;  (handle-exceptions
;;   exn
;;   (begin
;;     (print "ERROR:  Failed to run command: " cmd " " (string-intersperse params " "))
;;     (print "       " ((condition-property-accessor 'exn 'message) exn))
;;     #f)
   (let-values (((fh fho pid fhe) (if (null? params)
				      (process* cmd)
				      (process* cmd params))))
       (let loop ((curr (read-line fh))
		  (result  '()))
	 (let ((errstr (process:conservative-read fhe)))
	   (if (not (string=? errstr ""))
	       (set! result (append result (list errstr)))))
       (if (not (eof-object? curr))
	   (loop (read-line fh)
		 (append result (list curr)))
	   (begin
             (let-values (((anotherpid normalexit? exitstatus)  (process-wait pid)))
	     (close-input-port fh)
	     (close-input-port fhe)
	     (close-output-port fho)
               (list result (if normalexit? exitstatus -1))))))))

(define (process:cmd-run-proc-each-line cmd proc . params)
  ;; (print "Called with cmd=" cmd ", proc=" proc ", params=" params)
  (handle-exceptions
   exn
   (begin
     (print "ERROR:  Failed to run command: " cmd " " (string-intersperse params " "))
     (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
     (debug:print 5 *default-log-port* "exn=" (condition->list exn))
     #f)
   (let-values (((fh fho pid) (if (null? params)
				  (process cmd)
				  (process cmd params))))
       (let loop ((curr (read-line fh))
		(result  '()))
       (if (not (eof-object? curr))
	   (loop (read-line fh)
		 (append result (list (proc curr))))
	   (begin
	     (close-input-port fh)
	     ;;(close-input-port fhe)
	     (close-output-port fho)
	     result))))))

(define (process:cmd-run-proc-each-line-alt cmd proc)
  (let* ((fh (open-input-pipe cmd))
         (res (port-proc->list fh proc))
         (status (close-input-pipe fh)))
    (if (eq? status 0) res #f)))

(define (process:cmd-run->list cmd #!key (delta-env-alist-or-hash-table '()))
  (common:with-env-vars
   delta-env-alist-or-hash-table
   (lambda ()
     (let* ((fh (open-input-pipe cmd))
            (res (port->list fh))
            (status (close-input-pipe fh)))
       (list res status)))))
   
(define (port->list fh)
  (if (eof-object? fh) #f
      (let loop ((curr (read-line fh))
                 (result '()))
        (if (not (eof-object? curr))
            (loop (read-line fh)
                  (append result (list curr)))
            result))))

(define (port-proc->list fh proc)
  (if (eof-object? fh) #f
      (let loop ((curr (proc (read-line fh)))
                 (result '()))
        (if (not (eof-object? curr))
            (loop (let ((l (read-line fh)))
                    (if (eof-object? l) l (proc l)))
                  (append result (list curr)))
            result))))

;; here is an example line where the shell is sh or bash
;; "find / -print 2&>1 > findall.log"
(define (run-n-wait cmdline #!key (params #f)(print-cmd #f)(run-dir #f))
  (if print-cmd 
      (debug:print 0 *default-log-port* 
		   (if (string? print-cmd)
		       print-cmd
		       "")
		   (if run-dir (conc "Run in " run-dir ";") "")
		   cmdline
		   (if params
		       (conc " " (string-intersperse params " "))
		       "")))
  (if (and run-dir
	   (directory-exists? run-dir))
      (push-directory run-dir))
  (let ((pid (if params
		 (process-run cmdline params)
		 (process-run cmdline))))
    (let loop ((i 0))
      (let-values (((pid-val exit-status exit-code) (process-wait pid #t)))
         (if (eq? pid-val 0)
	     (begin
	       (thread-sleep! 2)
	       (loop (+ i 1)))
	     (begin
	       (if (and run-dir
			(directory-exists? run-dir))
		   (pop-directory))
	       (values pid-val exit-status exit-code)))))))
  
;;======================================================================
;; MISC PROCESS RELATED STUFF
;;======================================================================

(define (process:children proc)
  (with-input-from-pipe
   (conc "ps h --ppid " (current-process-id) " -o pid")
   (lambda ()
     (let loop ((inl (read-line))
		(res '()))
       (if (eof-object? inl)
	   (reverse res)
	   (let ((pid (string->number inl)))
	     (if proc (proc pid))
	     (loop (read-line) (cons pid res))))))))

(define (process:alive? pid)
  (handle-exceptions
   exn
   ;; possibly pid is a process not a child, look in /proc to see if it is running still
   (file-exists? (conc "/proc/" pid))
   (let-values (((rpid exit-type exit-signal)(process-wait pid #t)))
       (and (number? rpid)
	    (equal? rpid pid)))))

(define (process:alive-on-host? host pid)
  (let ((cmd (conc "ssh " host " ps -o pid= -p " pid)))
    (handle-exceptions
	exn
      (begin
	(debug:print 0 *default-log-port* "failed to identify if process " pid ", on host " host " is alive. exn=" exn)
	#f) ;; anything goes wrong - assume the process in NOT running.
     (with-input-from-pipe 
      cmd
      (lambda ()
	(let loop ((inl (read-line)))
	  (if (eof-object? inl)
	      #f
	      (let* ((clean-str (string-substitute "^[^\\d]*([0-9]+)[^\\d]*$" "\\1" inl))
		     (innum     (string->number clean-str)))
		(and innum
		     (eq? pid innum))))))))))

(define (process:get-sub-pids pid)
  (with-input-from-pipe
   (conc "pstree -A -p " pid) ;; | tr 'a-z\\-+`()\\.' ' ' " pid)
   (lambda ()
     (let loop ((inl (read-line))
		(res '()))
       (if (eof-object? inl)
	   (reverse res)
	   (let ((nums (map string->number
			    (string-split-fields "\\d+" inl))))
	     (loop (read-line)
		   (append res nums))))))))

)