lifecycle.lisp

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   2 ;;;; Copyright (c) 2012 Zachary Beane, All Rights Reserved
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  27 ;;;;
  28 ;;;; lifecycle.lisp
  29
  30 (in-package #:zs3)
  31
  32 ;;; Object expiration for buckets
  33
  34 (defbinder lifecycle-configuration
  35   ("LifecycleConfiguration"
  36    (sequence :rules
  37              ("Rule"
  38               ("ID" (bind :id))
  39               ("Prefix" (bind :prefix))
  40               ("Status" (bind :status))
  41               ("Expiration"
  42                ("Days" (bind :days)))))))
  43
  44 (defclass lifecycle-rule ()
  45   ((id
  46     :initarg :id
  47     :accessor id)
  48    (prefix
  49     :initarg :prefix
  50     :accessor prefix)
  51    (enabledp
  52     :initarg :enabledp
  53     :accessor enabledp)
  54    (days
  55     :initarg :days
  56     :accessor days)))
  57
  58 (defmethod print-object ((rule lifecycle-rule) stream)
  59   (print-unreadable-object (rule stream :type t)
  60     (format stream "~S expire prefix ~S in ~D day~:P (~:[disabled~;enabled~])"
  61             (id rule)
  62             (prefix rule)
  63             (days rule)
  64             (enabledp rule))))
  65
  66 ;;; FIXME: The GFs for ENABLE and DISABLE should really be moved
  67 ;;; somewhere out of cloudfront.lisp now that I'm adding more methods.
  68
  69 (defmethod disable ((rule lifecycle-rule))
  70   (setf (enabledp rule) nil))
  71
  72 (defmethod enable ((rule lifecycle-rule))
  73   (setf (enabledp rule) t))
  74
  75 (defun lifecycle-rule (&key id prefix (enabled t) days)
  76   (unless id
  77     (setf id (string (gensym))))
  78   (unless prefix
  79     (error "Missing PREFIX argument"))
  80   (unless days
  81     (error "Missing DAYS argument"))
  82   (make-instance 'lifecycle-rule
  83                  :id id
  84                  :prefix prefix
  85                  :enabledp enabled
  86                  :days days))
  87
  88 (defun lifecycle-document (rules)
  89   (cxml:with-xml-output (cxml:make-octet-vector-sink)
  90     (cxml:with-element "LifecycleConfiguration"
  91       (dolist (rule rules)
  92         (cxml:with-element "Rule"
  93           (cxml:with-element "ID"
  94             (cxml:text (id rule)))
  95           (cxml:with-element "Prefix"
  96             (cxml:text (prefix rule)))
  97           (cxml:with-element "Status"
  98             (cxml:text (if (enabledp rule)
  99                            "Enabled"
 100                            "Disabled")))
 101           (cxml:with-element "Expiration"
 102             (cxml:with-element "Days"
 103               (cxml:text (princ-to-string (days rule))))))))))
 104
 105 (defun bindings-lifecycle-rules (bindings)
 106   (let ((rules '()))
 107     (dolist (rule-bindings (bvalue :rules bindings) (nreverse rules))
 108       (alist-bind (id prefix status days)
 109           rule-bindings
 110         (push (make-instance 'lifecycle-rule
 111                              :id id
 112                              :prefix prefix
 113                              :enabledp (string= status "Enabled")
 114                              :days (parse-integer days))
 115               rules)))))
 116
 117 (define-specific-error (no-such-lifecycle-configuration
 118                         "NoSuchLifecycleConfiguration")
 119     () ())
 120
 121 (defun bucket-lifecycle (bucket)
 122   "Return the bucket lifecycle rules for BUCKET. Signals
 123 NO-SUCH-LIFECYCLE-CONFIGURATION if the bucket has no lifecycle
 124 configuration."
 125   (let ((response
 126          (submit-request (make-instance 'request
 127                                         :method :get
 128                                         :bucket bucket
 129                                         :sub-resource "lifecycle"))))
 130     (bindings-lifecycle-rules
 131      (xml-bind 'lifecycle-configuration (body response)))))
 132
 133 (defun delete-bucket-lifecycle (bucket)
 134   "Delete the lifecycle configuration of BUCKET."
 135   (submit-request (make-instance 'request
 136                                  :method :delete
 137                                  :bucket bucket
 138                                  :sub-resource "lifecycle")))
 139
 140 (defun (setf bucket-lifecycle) (rules bucket)
 141   "Set the lifecycle configuration of BUCKET to RULES. RULES is
 142 coerced to a list if needed. If RULES is NIL, the lifecycle
 143 configuration is deleted with DELETE-BUCKET-LIFECYCLE."
 144   (when (null rules)
 145     (return-from bucket-lifecycle
 146       (delete-bucket-lifecycle bucket)))
 147   (unless (listp rules)
 148     (setf rules (list rules)))
 149   (let* ((content (lifecycle-document rules))
 150          (md5 (vector-md5/b64 content)))
 151     (submit-request (make-instance 'request
 152                                    :method :put
 153                                    :bucket bucket
 154                                    :sub-resource "lifecycle"
 155                                    :content-md5 md5
 156                                    :content content))))