thodg/cl-unix-cybernetics/core/operation.lisp

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• Hash : ca6ffa97
  Author : Thomas de Grivel
  Date : 2018-07-02T16:14:04
  

  rewrite without iterate

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• core/operation.lisp

• ;;
  ;;  adams  -  Remote system administration tools
  ;;
  ;;  Copyright 2013,2014 Thomas de Grivel <thomas@lowh.net>
  ;;
  ;;  Permission to use, copy, modify, and distribute this software for any
  ;;  purpose with or without fee is hereby granted, provided that the above
  ;;  copyright notice and this permission notice appear in all copies.
  ;;
  ;;  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  ;;  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  ;;  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ;;  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  ;;  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ;;  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  ;;  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  ;;
  
  (in-package :adams)
  
  ;;  Operation methods
  
  (declaim (ftype (function (operation) function) operation-generic-function))
  (defgeneric operation-generic-function (operation))
  
  (defmethod operation-generic-function ((op operation))
    (symbol-function (operation-name op)))
  
  (defmethod print-object ((op operation) stream)
    (print-unreadable-object (op stream :type t :identity (not *print-pretty*))
      (format stream "~S (~{~A~^ ~})"
  	    (operation-name op)
  	    (operation-properties op))))
  
  ;;  Relate operations to properties in each resource class
  
  (defmethod operation-class ((rc resource-class))
    'operation)
  
  (defmethod compute-operations ((rc resource-class))
    (let ((class-precedence-list (closer-mop:class-precedence-list rc))
          (ops))
      (loop
         (when (endp class-precedence-list)
           (return))
         (let* ((class (pop class-precedence-list))
                (direct-ops (when (typep class 'resource-class)
                              (direct-operations class))))
           (dolist (op-definition direct-ops)
             (let ((op (apply #'make-instance (operation-class rc)
                              :name op-definition)))
               (push op ops)))))
      (nreverse ops)))
  
  (defmethod operation-properties ((rc resource-class))
    (let ((properties nil))
      (dolist (op (operations-of rc))
        (dolist (property (operation-properties op))
  	(pushnew property properties)))
      (sort properties #'string<)))
  
  ;;  Probing resources
  
  (defmethod operation-properties ((r resource))
    (operation-properties (class-of r)))
  
  (defmethod operations-of ((r resource))
    (operations-of (class-of r)))
  
  (defmethod find-operation ((r resource)
                             (property symbol)
                             os)
    (some (lambda (op)
            (when (find property (operation-properties op) :test #'eq)
              (let ((f (operation-generic-function op)))
                (when (compute-applicable-methods f (list r os))
                  op))))
          (operations-of r)))
  
  (defmethod list-operations (res plist os)
    (let (operations)
      (loop
         (when (endp plist)
           (return))
         (let* ((property (pop plist))
                (value (pop plist))
                (op (find-operation res property os)))
           (declare (ignore value))
           (unless op
             (error 'resource-operation-not-found
                    :resource res
                    :property property
                    :host (current-host)
                    :os os))
           (push op operations)))
      (nreverse operations)))
  
  (defun sort-operations (operations)
    (sort operations (lambda (op1 op2)
                       (find op1 (operations-before op2)))))
  
  (defmethod operate ((res resource) (plist list))
    (let* ((os (host-os (current-host)))
           (operations (list-operations res plist os))
           (sorted-ops (sort-operations operations))
           (results))
      (loop
         (let* ((op (pop sorted-ops))
                (result (apply (operation-generic-function op)
                               res os plist)))
           (push result results)))
      (nreverse results)))
  
  ;;  Conditions
  
  (defmethod print-object ((c resource-operation-not-found) stream)
    (if *print-escape*
        (call-next-method)
        (with-slots (resource property host os) c
  	(format stream "Operation not found~%resource ~A~%property ~A~%host ~S~%~A"
  		resource property (hostname host)
  		(class-name (class-of os))))))
  
  (defmethod print-object ((c resource-operation-failed) stream)
    (if *print-escape*
        (call-next-method)
        (with-slots (operation resource diff host os) c
  	(format stream "~A failed for (resource '~A ~S) on (host ~S) ~A.~%Conflicting values :~%~{ ~A~%  expected ~S~%  probed   ~S~%~}"
  		(operation-name operation)
                  (string-downcase (class-name (class-of resource)))
                  (resource-id resource)
                  (hostname host)
  		(class-name (class-of os))
                  diff))))
  

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