From ce235399e2e1f47eb8e76387de2b88850304f284 Mon Sep 17 00:00:00 2001
From: Martin Becze <mjbecze@riseup.net>
Date: Thu, 30 Jan 2020 11:17:00 -0500
Subject: [PATCH v14 3/6] import: crate: Memorize crate->guix-package.

This adds memorization to procedures that involve network lookups.
'lookup-crate*' is used on every dependency of a package to get its version
list. It is also used to lookup a packages metadata. 'crate-recursive-import'
is also memorized since creating the same package twice will trigger a lookup
on in its dependencies.

* guix/import/crate.scm (lookup-crate*): New procedure.
  (crate->guix-package): Memorize package metadata lookups.
  (crate-recursive-import): Memorize package creation.
---
 guix/import/crate.scm | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/guix/import/crate.scm b/guix/import/crate.scm
index 6054246fa3..ffb74bd8cc 100644
--- a/guix/import/crate.scm
+++ b/guix/import/crate.scm
@@ -28,6 +28,7 @@
   #:use-module (guix import json)
   #:use-module (guix import utils)
   #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix memoization)
   #:use-module (guix monads)
   #:use-module (guix packages)
   #:use-module (guix upstream)
@@ -111,6 +112,8 @@ record or #f if it was not found."
                (json->crate `(,@alist
                               ("actual_versions" . ,versions))))))))
 
+(define lookup-crate* (memoize lookup-crate))
+
 (define (crate-version-dependencies version)
   "Return the list of <crate-dependency> records of VERSION, a
 <crate-version>."
@@ -216,7 +219,7 @@ latest version of CRATE-NAME."
         (eq? (crate-dependency-kind dependency) 'normal)))
 
   (define crate
-    (lookup-crate crate-name))
+    (lookup-crate* crate-name))
 
   (define version-number
     (and crate
@@ -240,7 +243,7 @@ latest version of CRATE-NAME."
   (define (sort-map-dependencies deps)
     (sort (map (lambda (dep)
                  (let* ((name (crate-dependency-id dep))
-                        (crate (lookup-crate name))
+                        (crate (lookup-crate* name))
                         (req (crate-dependency-requirement dep))
                         (ver (find-version crate req)))
                    (list name
@@ -269,7 +272,7 @@ latest version of CRATE-NAME."
 
 (define* (crate-recursive-import crate-name #:key version)
   (recursive-import crate-name
-                    #:repo->guix-package crate->guix-package
+                    #:repo->guix-package (memoize crate->guix-package)
                     #:version version
                     #:guix-name crate-name->package-name))
 
-- 
2.26.2