From 6353df8bca63075a24ee736ba36055f4e87e334a Mon Sep 17 00:00:00 2001
From: Alejandro Lopez <a.lopez@yadro.com>
Date: Fri, 4 Aug 2023 11:43:36 +0300
Subject: [PATCH] [#142] Fix unwrapErr for go 1.20

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>
---
 client/errors.go | 65 ++++++++++++++++--------------------------------
 1 file changed, 22 insertions(+), 43 deletions(-)

diff --git a/client/errors.go b/client/errors.go
index 769b442..64144b6 100644
--- a/client/errors.go
+++ b/client/errors.go
@@ -1,85 +1,64 @@
 package client
 
 import (
-	"errors"
 	"fmt"
 
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 )
 
-// unwraps err using errors.Unwrap and returns the result.
-func unwrapErr(err error) error {
-	for e := errors.Unwrap(err); e != nil; e = errors.Unwrap(err) {
-		err = e
+// wrapsErrType returns true if any error in the error tree of err is of type E.
+func wrapsErrType[E error](err error) bool {
+	switch e := err.(type) {
+	case E:
+		return true
+	case interface{ Unwrap() error }:
+		return wrapsErrType[E](e.Unwrap())
+	case interface{ Unwrap() []error }:
+		for _, ei := range e.Unwrap() {
+			if wrapsErrType[E](ei) {
+				return true
+			}
+		}
+		return false
+	default:
+		return false
 	}
-
-	return err
 }
 
 // IsErrContainerNotFound checks if err corresponds to FrostFS status
 // return corresponding to missing container. Supports wrapped errors.
 func IsErrContainerNotFound(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.ContainerNotFound:
-		return true
-	}
+	return wrapsErrType[*apistatus.ContainerNotFound](err)
 }
 
 // IsErrEACLNotFound checks if err corresponds to FrostFS status
 // return corresponding to missing eACL table. Supports wrapped errors.
 func IsErrEACLNotFound(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.EACLNotFound:
-		return true
-	}
+	return wrapsErrType[*apistatus.EACLNotFound](err)
 }
 
 // IsErrObjectNotFound checks if err corresponds to FrostFS status
 // return corresponding to missing object. Supports wrapped errors.
 func IsErrObjectNotFound(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.ObjectNotFound:
-		return true
-	}
+	return wrapsErrType[*apistatus.ObjectNotFound](err)
 }
 
 // IsErrObjectAlreadyRemoved checks if err corresponds to FrostFS status
 // return corresponding to already removed object. Supports wrapped errors.
 func IsErrObjectAlreadyRemoved(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.ObjectAlreadyRemoved:
-		return true
-	}
+	return wrapsErrType[*apistatus.ObjectAlreadyRemoved](err)
 }
 
 // IsErrSessionExpired checks if err corresponds to FrostFS status return
 // corresponding to expired session. Supports wrapped errors.
 func IsErrSessionExpired(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.SessionTokenExpired:
-		return true
-	}
+	return wrapsErrType[*apistatus.SessionTokenExpired](err)
 }
 
 // IsErrSessionNotFound checks if err corresponds to FrostFS status return
 // corresponding to missing session. Supports wrapped errors.
 func IsErrSessionNotFound(err error) bool {
-	switch unwrapErr(err).(type) {
-	default:
-		return false
-	case *apistatus.SessionTokenNotFound:
-		return true
-	}
+	return wrapsErrType[*apistatus.SessionTokenNotFound](err)
 }
 
 // returns error describing missing field with the given name.