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x/net cannot use errors.Is on net.DNSError #40179

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georgettica opened this issue Jul 12, 2020 · 2 comments
Closed

x/net cannot use errors.Is on net.DNSError #40179

georgettica opened this issue Jul 12, 2020 · 2 comments
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@georgettica
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What version of Go are you using (go version)?

$ go version
go version go1.14.4 darwin/amd64

Does this issue reproduce with the latest release?

this is the latest release on brew, so I would say yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN="/Users/$USER/.gvm/pkgsets/system/global/bin/"
GOCACHE="/Users/$USER/Library/Caches/go-build"
GOENV="/Users/$USER/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/$USER/.gvm/pkgsets/system/global"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.14.4/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14.4/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/$TEMP_FOLDER=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

when I used a a http.Get(url) to a location that is not public accessible, I get a net.DNSError. I am trying to catch that error, and tried to use errors.Is but this seemed to fail.
My current workarounds:

  • remove test url.Error instead (not ideal)
  • unwrap to the level I need and test for net.DNSError

you can see the code here..
https://play.golang.org/p/hl9bbhQnL2i
if you comment section 3 you will see section 4 succeed aswell.

What did you expect to see?

I expect errors.Is to work for me or at lest to find a documentation for how to make it work

What did you see instead?

I see I need to use the unwrapping and testing myself
@gopherbot gopherbot added this to the Unreleased milestone Jul 12, 2020
@seankhliao
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seankhliao commented Jul 12, 2020 •
edited

use errors.As https://blog.golang.org/go1.13-errors#TOC_3.2.

see https://github.com/golang/go/wiki/Questions for the appropriate place to ask questions

@mdlayher
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See above, closing.

@golang golang locked and limited conversation to collaborators Jul 12, 2021
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@mdlayher @gopherbot @seankhliao @georgettica