[bug#49196] [PATCH v3 3/3] import: go: Improve error handling.

[zimoun <zimon.toutoune@gmail.com>]

* guix/import/go.scm (go-module->guix-package*): Handle errors.
(go-module-recursive-import): Remove 'guard'.
* guix/scripts/import/go.scm (guix-import-go): Adjust.
* tests/go.scm: Adjust.
---
 guix/import/go.scm         | 43 ++++++++++++++++++++++----------------
 guix/scripts/import/go.scm |  6 +++---
 tests/go.scm               |  2 +-
 3 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/guix/import/go.scm b/guix/import/go.scm
index c859098492..c559f02e5b 100644
--- a/guix/import/go.scm
+++ b/guix/import/go.scm
@@ -6,6 +6,7 @@
 ;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -61,7 +62,7 @@
   #:use-module (web response)
   #:use-module (web uri)
 
-  #:export (go-module->guix-package
+  #:export (go-module->guix-package*
             go-module-recursive-import))
 
 ;;; Commentary:
@@ -630,17 +631,9 @@ hint: use one of the following available versions ~a\n"
          dependencies+versions
          dependencies))))
 
-(define go-module->guix-package* (memoize go-module->guix-package))
-
-(define* (go-module-recursive-import package-name
-                                     #:key (goproxy "https://proxy.golang.org")
-                                     version
-                                     pin-versions?)
-
-  (recursive-import
-   package-name
-   #:repo->guix-package
-   (lambda* (name #:key version repo)
+(define go-module->guix-package*
+  (memoize
+   (lambda args
      ;; Disable output buffering so that the following warning gets printed
      ;; consistently.
      (setvbuf (current-error-port) 'none)
@@ -648,15 +641,29 @@ hint: use one of the following available versions ~a\n"
                 (warning (G_ "Failed to import package ~s.
 reason: ~s could not be fetched: HTTP error ~a (~s).
 This package and its dependencies won't be imported.~%")
-                         name
+                         (match args ((name _ ...) name))
                          (uri->string (http-get-error-uri c))
                          (http-get-error-code c)
                          (http-get-error-reason c))
+                (values #f '()))
+               (else
+                (warning (G_ "Something went wrong with ~s.~%") args)
                 (values #f '())))
-       (receive (package-sexp dependencies)
-           (go-module->guix-package* name #:goproxy goproxy
-                                     #:version version
-                                     #:pin-versions? pin-versions?)
-         (values package-sexp dependencies))))
+       (apply go-module->guix-package args)))))
+
+(define* (go-module-recursive-import package-name
+                                     #:key (goproxy "https://proxy.golang.org")
+                                     version
+                                     pin-versions?)
+
+  (recursive-import
+   package-name
+   #:repo->guix-package
+   (lambda* (name #:key version repo)
+     (receive (package-sexp dependencies)
+         (go-module->guix-package* name #:goproxy goproxy
+                                   #:version version
+                                   #:pin-versions? pin-versions?)
+       (values package-sexp dependencies)))
    #:guix-name go-module->guix-package-name
    #:version version))
diff --git a/guix/scripts/import/go.scm b/guix/scripts/import/go.scm
index 74e8e60cce..071ecdb2ef 100644
--- a/guix/scripts/import/go.scm
+++ b/guix/scripts/import/go.scm
@@ -115,10 +115,10 @@ that are not yet in Guix"))
                (map package->definition*
                     (apply go-module-recursive-import arguments))
                ;; Single import.
-               (let ((sexp (apply go-module->guix-package arguments)))
+               (let ((sexp (apply go-module->guix-package* arguments)))
                  (unless sexp
-                   (leave (G_ "failed to download meta-data for module '~a'~%")
-                          module-name))
+                   (leave (G_ "failed to download meta-data for module '~a'.~%")
+                          name))
                  (package->definition* sexp))))))
       (()
        (leave (G_ "too few arguments~%")))
diff --git a/tests/go.scm b/tests/go.scm
index b088ab50d2..929a8b39d1 100644
--- a/tests/go.scm
+++ b/tests/go.scm
@@ -286,6 +286,6 @@ package.")
                               (nix-base32-string->bytevector
                                "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5")
                               #f)))
-                 (go-module->guix-package "github.com/go-check/check")))))))
+                 (go-module->guix-package* "github.com/go-check/check")))))))
 
 (test-end "go")
-- 
2.32.0