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Merge pull request #291 from negz/error
Add an `errors` package with a similar API to `github.com/pkg/errors`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| Copyright 2021 The Crossplane Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| // Package errors is a github.com/pkg/errors compatible API for native errors. | ||
| // It includes only the subset of the github.com/pkg/errors API that is used by | ||
| // the Crossplane project. | ||
| package errors | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // New returns an error that formats as the given text. Each call to New returns | ||
| // a distinct error value even if the text is identical. | ||
| func New(text string) error { return errors.New(text) } | ||
|
|
||
| // Is reports whether any error in err's chain matches target. | ||
| // | ||
| // The chain consists of err itself followed by the sequence of errors obtained | ||
| // by repeatedly calling Unwrap. | ||
| // | ||
| // An error is considered to match a target if it is equal to that target or if | ||
| // it implements a method Is(error) bool such that Is(target) returns true. | ||
| // | ||
| // An error type might provide an Is method so it can be treated as equivalent | ||
| // to an existing error. For example, if MyError defines | ||
| // | ||
| // func (m MyError) Is(target error) bool { return target == fs.ErrExist } | ||
| // | ||
| // then Is(MyError{}, fs.ErrExist) returns true. See syscall.Errno.Is for | ||
| // an example in the standard library. | ||
| func Is(err, target error) bool { return errors.Is(err, target) } | ||
|
|
||
| // As finds the first error in err's chain that matches target, and if so, sets | ||
| // target to that error value and returns true. Otherwise, it returns false. | ||
| // | ||
| // The chain consists of err itself followed by the sequence of errors obtained | ||
| // by repeatedly calling Unwrap. | ||
| // | ||
| // An error matches target if the error's concrete value is assignable to the | ||
| // value pointed to by target, or if the error has a method As(interface{}) bool | ||
| // such that As(target) returns true. In the latter case, the As method is | ||
| // responsible for setting target. | ||
| // | ||
| // An error type might provide an As method so it can be treated as if it were a | ||
| // different error type. | ||
| // | ||
| // As panics if target is not a non-nil pointer to either a type that implements | ||
| // error, or to any interface type. | ||
| func As(err error, target interface{}) bool { return errors.As(err, target) } | ||
|
|
||
| // Unwrap returns the result of calling the Unwrap method on err, if err's type | ||
| // contains an Unwrap method returning error. Otherwise, Unwrap returns nil. | ||
| func Unwrap(err error) error { return errors.Unwrap(err) } | ||
|
|
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| // Errorf formats according to a format specifier and returns the string as a | ||
| // value that satisfies error. | ||
| // | ||
| // If the format specifier includes a %w verb with an error operand, the | ||
| // returned error will implement an Unwrap method returning the operand. It is | ||
| // invalid to include more than one %w verb or to supply it with an operand that | ||
| // does not implement the error interface. The %w verb is otherwise a synonym | ||
| // for %v. | ||
| func Errorf(format string, a ...interface{}) error { return fmt.Errorf(format, a...) } | ||
|
|
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| // WithMessage annotates err with a new message. If err is nil, WithMessage | ||
| // returns nil. | ||
| func WithMessage(err error, message string) error { | ||
| if err == nil { | ||
| return nil | ||
| } | ||
| return fmt.Errorf("%s: %w", message, err) | ||
| } | ||
|
|
||
| // WithMessagef annotates err with the format specifier. If err is nil, | ||
| // WithMessagef returns nil. | ||
| func WithMessagef(err error, format string, args ...interface{}) error { | ||
| if err == nil { | ||
| return nil | ||
| } | ||
| return fmt.Errorf("%s: %w", fmt.Sprintf(format, args...), err) | ||
| } | ||
|
|
||
| // Wrap is an alias for WithMessage. | ||
| func Wrap(err error, message string) error { | ||
| return WithMessage(err, message) | ||
| } | ||
|
|
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| // Wrapf is an alias for WithMessagef | ||
| func Wrapf(err error, format string, args ...interface{}) error { | ||
| return WithMessagef(err, format, args...) | ||
| } | ||
|
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| // Cause calls Unwrap on each error it finds. It returns the first error it | ||
| // finds that does not have an Unwrap method - i.e. the first error that was not | ||
| // the result of a Wrap call, a Wrapf call, or an Errorf call with %w wrapping. | ||
| func Cause(err error) error { | ||
| type wrapped interface { | ||
| Unwrap() error | ||
| } | ||
|
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| for err != nil { | ||
| // We're ignoring errorlint telling us to use errors.As because | ||
| // we actually do want to check the outermost error. | ||
| //nolint:errorlint | ||
| w, ok := err.(wrapped) | ||
| if !ok { | ||
| return err | ||
| } | ||
| err = w.Unwrap() | ||
| } | ||
|
|
||
| return err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /* | ||
| Copyright 2021 The Crossplane Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package errors | ||
|
|
||
| import ( | ||
| "testing" | ||
|
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| "github.com/google/go-cmp/cmp" | ||
|
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| "github.com/crossplane/crossplane-runtime/pkg/test" | ||
| ) | ||
|
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| func TestWrap(t *testing.T) { | ||
| type args struct { | ||
| err error | ||
| message string | ||
| } | ||
| cases := map[string]struct { | ||
| args args | ||
| want error | ||
| }{ | ||
| "NilError": { | ||
| args: args{ | ||
| err: nil, | ||
| message: "very useful context", | ||
| }, | ||
| want: nil, | ||
| }, | ||
| "NonNilError": { | ||
| args: args{ | ||
| err: New("boom"), | ||
| message: "very useful context", | ||
| }, | ||
| want: Errorf("very useful context: %w", New("boom")), | ||
| }, | ||
| } | ||
|
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| for name, tc := range cases { | ||
| t.Run(name, func(t *testing.T) { | ||
| got := Wrap(tc.args.err, tc.args.message) | ||
| if diff := cmp.Diff(tc.want, got, test.EquateErrors()); diff != "" { | ||
| t.Errorf("Wrap(...): -want, +got:\n%s", diff) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func TestWrapf(t *testing.T) { | ||
| type args struct { | ||
| err error | ||
| message string | ||
| args []interface{} | ||
| } | ||
| cases := map[string]struct { | ||
| args args | ||
| want error | ||
| }{ | ||
| "NilError": { | ||
| args: args{ | ||
| err: nil, | ||
| message: "very useful context", | ||
| }, | ||
| want: nil, | ||
| }, | ||
| "NonNilError": { | ||
| args: args{ | ||
| err: New("boom"), | ||
| message: "very useful context about %s", | ||
| args: []interface{}{"ducks"}, | ||
| }, | ||
| want: Errorf("very useful context about %s: %w", "ducks", New("boom")), | ||
| }, | ||
| } | ||
|
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| for name, tc := range cases { | ||
| t.Run(name, func(t *testing.T) { | ||
| got := Wrapf(tc.args.err, tc.args.message, tc.args.args...) | ||
| if diff := cmp.Diff(tc.want, got, test.EquateErrors()); diff != "" { | ||
| t.Errorf("Wrapf(...): -want, +got:\n%s", diff) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
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| func TestCause(t *testing.T) { | ||
| cases := map[string]struct { | ||
| err error | ||
| want error | ||
| }{ | ||
| "NilError": { | ||
| err: nil, | ||
| want: nil, | ||
| }, | ||
| "BareError": { | ||
| err: New("boom"), | ||
| want: New("boom"), | ||
| }, | ||
| "WrappedError": { | ||
| err: Wrap(Wrap(New("boom"), "interstitial context"), "very important context"), | ||
| want: New("boom"), | ||
| }, | ||
| } | ||
|
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| for name, tc := range cases { | ||
| t.Run(name, func(t *testing.T) { | ||
| got := Cause(tc.err) | ||
| if diff := cmp.Diff(tc.want, got, test.EquateErrors()); diff != "" { | ||
| t.Errorf("Cause(...): -want, +got:\n%s", diff) | ||
| } | ||
| }) | ||
| } | ||
| } |
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