From 2d7036f910bc58c5d791dba560e50ff18adfa70f Mon Sep 17 00:00:00 2001
From: Piotr Szarmanski
Date: Fri, 25 Aug 2023 19:44:07 +0200
Subject: Remove function-cache, cached-lambda.

---
 src/cache.lisp       | 45 ---------------------------------------------
 src/eris-decode.lisp | 30 ++++++++----------------------
 src/package.lisp     |  2 +-
 3 files changed, 9 insertions(+), 68 deletions(-)
 delete mode 100644 src/cache.lisp

(limited to 'src')

diff --git a/src/cache.lisp b/src/cache.lisp
deleted file mode 100644
index d6bce9c..0000000
--- a/src/cache.lisp
+++ /dev/null
@@ -1,45 +0,0 @@
-;; This is a patch for function-cache, enabling a per-stream cache for
-;; eris-decode-stream.
-
-(in-package :function-cache)
-
-(defmacro cached-lambda (cache-list lambda-list &body body)
-  "Creates a cached lambda function with the cache-list
-   cache-list is a list (&rest CACHE-INIT-ARGS
-                           &key CACHE-CLASS TABLE TIMEOUT SHARED-RESULTS?)
-
-   TABLE - a shared cache-store to use, usually a hash-table, a function that returns
-     a hashtable, or a symbol whose value is a hash-table
-   TIMEOUT - how long entries in the cache should be considered valid for
-   CACHE-CLASS - controls what cache class will be instantiated (uses
-     default-cache-class if not provided)
-   SHARED-RESULTS? - do we expect that we are sharing cache space with other things
-     defaults to t if TABLE is provided
-   CACHE-INIT-ARGS - any other args that should be passed to the cache
-  "
-  (destructuring-bind (&rest cache-args
-                       &key table (shared-results? nil shared-result-input?)
-                         cache-class
-                       &allow-other-keys)
-      (ensure-list cache-list)
-    (declare (ignore cache-class)) ;; handled in default-cache-class
-    (remf cache-args :cache-class)
-    (remf cache-args :table)
-    (remf cache-args :shared-results?)
-    (when (and table (not shared-result-input?))  (setf shared-results? t))
-    (let* ((cache-class (default-cache-class (cons nil cache-list) lambda-list))
-           (call-list (%call-list-for-lambda-list lambda-list))
-           (cache (gensym)))
-      `(let ((,cache
-               (make-instance ',cache-class
-                              :body-fn (lambda ,lambda-list
-                                         ,@body)
-                              :name nil
-                              :lambda-list ',lambda-list
-                              :shared-results? ,shared-results?
-                              :cached-results ,table
-                              ,@cache-args)))
-         (lambda ,lambda-list
-           (cacher ,cache ,call-list))))))
-
-(export 'cached-lambda)
diff --git a/src/eris-decode.lisp b/src/eris-decode.lisp
index df64913..ac458fb 100644
--- a/src/eris-decode.lisp
+++ b/src/eris-decode.lisp
@@ -209,7 +209,7 @@ it is necessary and sets the position in the buffer to 0."
 
 
 
-(defun eris-decode (read-capability fetch-function &key (cache-capacity 2048))
+(defun eris-decode (read-capability fetch-function)
   "Using the FETCH-FUNCTION, return a stream that decodes the READ-CAPABILITY.
 This stream implements the Gray streams protocol.
 
@@ -219,32 +219,18 @@ be destructively modified, so you MUST provide a fresh array every time. If a
 hash-table is used, a (copy-seq) needs to be done on the return value of
 gethash.
 
-The keyword argument CACHE-CAPACITY indicates the amount of blocks stored in the
-cache. It may be NIL to turn off caching entirely.
-
 The conditions ERIS:MISSING-BLOCK, ERIS:PADDING, ERIS:HASH-MISMATCH and ERIS:EOF
 may be signaled by operations on the stream. Any condition signaled from within
 FETCH-FUNCTION is not handled."
   (declare (type read-capability read-capability)
-           (type function fetch-function)
-           (type (or integer null) cache-capacity))
+           (type function fetch-function))
   (with-slots (level block-size root-reference-pair) read-capability
-    (let* ((get-block (if cache-capacity ;; handle caching
-                          (cached-lambda (:cache-class 'lru-cache 
-                                                       :capacity cache-capacity
-                                                       :table (make-hash-table :size (1+ cache-capacity) :test #'equalp))
-                                         (rk nonce)
-                                         (declare (type octet-vector rk nonce))
-                                         (let ((block (execute-fetch-function fetch-function rk)))
-                                           (declare (type octet-vector block))
-                                           (hash-check block rk)
-                                           (decrypt-block block rk nonce)))
-                        (lambda (rk nonce)
-                          (declare (type octet-vector rk nonce)) 
-                          (let ((block (execute-fetch-function fetch-function rk)))
-                            (declare (type octet-vector block))
-                            (hash-check block rk)
-                            (decrypt-block block rk nonce)))))
+    (let* ((get-block (lambda (rk nonce)
+                        (declare (type octet-vector rk nonce)) 
+                        (let ((block (execute-fetch-function fetch-function rk)))
+                          (declare (type octet-vector block))
+                          (hash-check block rk)
+                          (decrypt-block block rk nonce))))
            (root (funcall get-block root-reference-pair  (make-nonce level))))
       ;; "Implementations MUST verify the key appearing in the read capability
       ;; if level of encoded content is larger than 0."
diff --git a/src/package.lisp b/src/package.lisp
index 51ca5c7..e516e74 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -15,7 +15,7 @@
 
 
 (defpackage eris
-  (:use #:common-lisp #:trivial-gray-streams #:alexandria #:serapeum #:function-cache)
+  (:use #:common-lisp #:trivial-gray-streams #:alexandria #:serapeum)
   (:export
    #:eris-encode
    #:eris-decode
-- 
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