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   (let ((response
 123          (submit-request (make-instance 'request
 124                                         :method :get
 125                                         :bucket bucket
 126                                         :sub-resource "lifecycle"))))
 127     (bindings-lifecycle-rules
 128      (xml-bind 'lifecycle-configuration (body response)))))
 129
 130 (defun delete-bucket-lifecycle (bucket)
 131   (submit-request (make-instance 'request
 132                                  :method :delete
 133                                  :bucket bucket
 134                                  :sub-resource "lifecycle")))
 135
 136 (defun (setf bucket-lifecycle) (rules bucket)
 137   (when (null rules)
 138     (return-from bucket-lifecycle
 139       (delete-bucket-lifecycle bucket)))
 140   (unless (listp rules)
 141     (setf rules (list rules)))
 142   (let* ((content (lifecycle-document rules))
 143          (md5 (vector-md5/b64 content)))
 144     (submit-request (make-instance 'request
 145                                    :method :put
 146                                    :bucket bucket
 147                                    :sub-resource "lifecycle"
 148                                    :content-md5 md5
 149                                    :content content))))