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labelerrとsuberrを作った話 / created labelerr and suberr
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nametake
December 18, 2018
Technology
1
860
labelerrとsuberrを作った話 / created labelerr and suberr
https://golangtokyo.connpass.com/event/111077/
nametake
December 18, 2018
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Transcript
labelerrͱ suberrΛ࡞ͬͨ @nametake
ࣗݾհ
Shogo Nameki @nametake Go, Vim
Error handling
Έͳ͞Μ
GoͷError handling ͖Ͱ͔͢ʁ
ͪΖΜ ͖Ͱ͢ΑͶʁ
ࢲ͖Ͱ͢
͖ͳΜͰ͕͢……
StackTraceͱ͔ ErrorͷݪҼͱ͔ ແͯ͘ࠔΔ
ͦΜͳ͋ͳͨʹʂ
pkg/errors
Stack Trace͕ Errorʹͭ͘ʂ
errors.CauseͰ ݪҼΛऔΓग़ͤΔʂ
͜Ε͑͋͞Ε ࠔͬͨ͜ͱ ى͜Βͳ͍ʂʂʂ
Θ͚Ͱͳ͔ͬͨ
ྫ͑
WebΞϓϦͰͷ Error Handling
4xx 5xx
4xxϢʔβʔͷ ૢ࡞ʹΑͬͯ ൃੜ͢Δ
4xxͱ5xx ҧ͏ͷͱͯ͠ औΓѻ͍͍ͨ
Go෦తʹ ͲͬͪError (e.g. NotFound)
ൃੜݯͰ 4xxͱ͔5xxͱ͔ ҙࣝ͠ͳ͍
errors.CauseͰ ۠ผͰ͖ͳ͍
΄͔ʹ
None
None
ͲΜͳઃܭͰ
ϏδωεϩδοΫ (DomainϩδοΫ)
Domain Error
Errorͷதͷ Domain ErrorΛ औΓग़͍ͨ͠ (e.g. middleware)
ઌʹผͷError͕ ൃੜ͍ͯͨ͠߹ errors.Cause ͑ͳ͍
ͦͷ݁Ռ
if err := f(); err != nil { return errors.Wrap(
ErrDomain, err.Error(), ) }
if err := f(); err != nil { return errors.Wrap(
ErrDomain, err.Error(), ) }
if err := f(); err != nil { return errors.Wrap(
ErrDomain, err.Error(), ) }
if err := f(); err != nil { return errors.Wrap(
ErrDomain, err.Error(), ) }
Stack Trace ফ͑Δ͠ඇৗʹअѱ
Ͳ͏ʹ͔͍ͨ͠
࡞ͬͨ
github.com/nametake/labelerr github.com/nametake/suberr
github.com/ nametake/labelerr
Wrap(err error, label string) error Label(err error) string
Wrap(err error, label string) error Label(err error) string
Wrap(err error, label string) error Label(err error) string
Wrap(err error, label string) error Label(err error) string
Wrap(err error, label string) error Label(err error) string
Wrap(err error, label string) error Label(err error) string
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err)) third: second: warning: first: cause
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err)) warning
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err)) warning
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = labelerr.Wrap(err,
"warning") err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(labelerr.Label(err)) fmt.Println(errors.Cause(err)) cause
cause first wrap LABEL ERROR second wrap
cause first wrap LABEL ERROR second wrap
github.com/ nametake/suberr
Add(main error, sub error) error SubCause(err error) error
Add(main error, sub error) error SubCause(err error) error
Add(main error, sub error) error SubCause(err error) error
Add(main error, sub error) error SubCause(err error) error
Add(main error, sub error) error SubCause(err error) error
Add(main error, sub error) error SubCause(err error) error
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err)) third: second: sub: first: cause
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err)) sub
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err)) sub
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err))
err := errors.New("cause") err = errors.Wrap(err, "first") err = suberr.Add(err,
errors.New("sub")) err = errors.Wrap(err, "second") err = errors.Wrap(err, "third") fmt.Println(err) fmt.Println(suberr.SubCause(err)) fmt.Println(errors.Cause(err)) cause
cause first wrap second wrap third wrap
cause first wrap second wrap third wrap SUB ERROR
෦Ͱpkg/errorsΛ ͍ͬͯΔͷͰ Stack TraceΔ
ҾฦΓ Primitiveͳܕ͔͠ ͍ͬͯͳ͍
FBͬͯ·͢ʂ