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

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• Hash : b0ab5bb5
  Author : Thomas de Grivel
  Date : 2022-12-04T18:50:53
  

  cl-unix-cybernetics

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• core/probe.lisp

• ;; cl-unix-cybernetics
  ;; Copyright 2013-2022 Thomas de Grivel <thodg@kmx.io>
  ;;
  ;; Permission is hereby granted to use this software granted
  ;; the above copyright notice and this permission paragraph
  ;; are included in all copies and substantial portions of this
  ;; software.
  ;;
  ;; THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
  ;; PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
  ;; AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
  ;; THIS SOFTWARE.
  
  (in-package :cl-unix-cybernetics)
  
  ;;  Probe methods
  
  (defmethod probe-generic-function ((probe probe))
    (symbol-function (probe-name probe)))
  
  (defmethod print-object ((probe probe) stream)
    (print-unreadable-object (probe stream :type t :identity (not *print-pretty*))
      (format stream "~S (~{~A~^ ~})"
  	    (probe-name probe)
  	    (probe-properties probe))))
  
  ;;  Relate probes to properties in each resource class
  
  (defmethod probe-class ((rc resource-class))
    'probe)
  
  (defmethod compute-probes ((rc resource-class))
    (let ((class-precedence-list (closer-mop:class-precedence-list rc))
          (probes))
      (loop
         (when (endp class-precedence-list)
           (return))
         (let* ((class (pop class-precedence-list))
                (direct-probes (when (typep class 'resource-class)
                                 (direct-probes class))))
           (dolist (probe-definition direct-probes)
             (let ((probe (apply #'make-instance (probe-class rc)
                                 :name probe-definition)))
               (push probe probes)))))
      (nreverse probes)))
  
  (defmethod probe-properties ((rc resource-class))
    (let ((properties nil))
      (dolist (probe (probes-of rc))
        (dolist (property (probe-properties probe))
  	(pushnew property properties)))
      (sort properties #'string<)))
  
  ;;  Probing resources
  
  (defmethod probe-properties ((r resource))
    (probe-properties (class-of r)))
  
  (defmethod probes-of ((r resource))
    (probes-of (class-of r)))
  
  (defmethod find-probe ((r resource)
  		       (property symbol)
  		       os)
      (some (lambda (probe)
  	    (when (find property (probe-properties probe) :test #'eq)
  	      (let ((f (probe-generic-function probe)))
  		(when (compute-applicable-methods f (list r os))
  		  probe))))
  	  (probes-of r)))
  
  (defun add-probed-properties (resource properties)
    (format t "~&(resource '~A ~S ~{~S ~S~^ ~})~%"
            (class-name (class-of resource))
            (resource-id resource)
            properties)
    (setf #1=(probed-properties resource)
          (merge-properties resource #1# properties)))
  
  (defmethod probe ((r resource) (property symbol))
    (let* ((os (unless (and (typep r 'host)
                            (eq property :os))
                 (host-os (current-host))))
  	 (probe (or (find-probe r property os)
  		    (error 'resource-probe-not-found
  			   :resource r
  			   :property property
  			   :host (current-host)
  			   :os os)))
  	 (result (funcall (probe-generic-function probe) r os)))
      (when (eq +undefined+ (get-property property result))
        (error 'resource-probe-failed
  	     :probe probe
  	     :resource r
  	     :property property
  	     :host (current-host)
  	     :os os))
      (add-probed-properties r result)
      result))
  
  (defmethod probe ((host host) (property symbol))
    (with-host host
      (call-next-method)))
  
  (defmethod get-probed ((r resource) (property symbol))
    (let ((value (get-property property (probed-properties r))))
      (when (eq +undefined+ value)
        (setq value (get-property property (probe r property))))
      value))
  
  (defmethod clear-probed% ((r resource) (properties null))
    (setf (probed-properties r) nil))
  
  (defmethod clear-probed% ((r resource) (property symbol))
    (remf* (probed-properties r) property))
  
  (defmethod clear-probed% ((r resource) (properties cons))
    (dolist (p properties)
      (when p
        (clear-probed r p))))
  
  (defmethod clear-probed% ((res resource-container) properties)
    (call-next-method)
    (do-resources (child) res
      (clear-probed% child properties)))
  
  (defun clear-probed (&optional (resource *parent-resource*) properties)
    (clear-probed% resource properties))
  
  ;;  Conditions
  
  (defmethod print-object ((c resource-probe-not-found) stream)
    (if *print-escape*
        (call-next-method)
        (with-slots (resource property host os) c
  	(format stream "Probe not found~%resource ~A~%property ~A~%host ~S~%~A"
  		resource property (hostname host)
  		(class-name (class-of os))))))
  
  (defmethod print-object ((c resource-probe-failed) stream)
    (if *print-escape*
        (call-next-method)
        (with-slots (probe resource property host os) c
  	(format stream "~A failed~%resource ~A~%property ~A~%host ~S~%~A"
  		(probe-name probe) resource property (hostname host)
  		(class-name (class-of os))))))
  

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