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error.go
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error.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package zap
import (
"go.uber.org/zap/internal/pool"
"go.uber.org/zap/zapcore"
)
var _errArrayElemPool = pool.New(func() *errArrayElem {
return &errArrayElem{}
})
// Error is shorthand for the common idiom NamedError("error", err).
func Error(err error) Field {
return NamedError("error", err)
}
// NamedError constructs a field that lazily stores err.Error() under the
// provided key. Errors which also implement fmt.Formatter (like those produced
// by github.com/pkg/errors) will also have their verbose representation stored
// under key+"Verbose". If passed a nil error, the field is a no-op.
//
// For the common case in which the key is simply "error", the Error function
// is shorter and less repetitive.
func NamedError(key string, err error) Field {
if err == nil {
return Skip()
}
return Field{Key: key, Type: zapcore.ErrorType, Interface: err}
}
type errArray []error
func (errs errArray) MarshalLogArray(arr zapcore.ArrayEncoder) error {
for i := range errs {
if errs[i] == nil {
continue
}
// To represent each error as an object with an "error" attribute and
// potentially an "errorVerbose" attribute, we need to wrap it in a
// type that implements LogObjectMarshaler. To prevent this from
// allocating, pool the wrapper type.
elem := _errArrayElemPool.Get()
elem.error = errs[i]
err := arr.AppendObject(elem)
elem.error = nil
_errArrayElemPool.Put(elem)
if err != nil {
return err
}
}
return nil
}
type errArrayElem struct {
error
}
func (e *errArrayElem) MarshalLogObject(enc zapcore.ObjectEncoder) error {
// Re-use the error field's logic, which supports non-standard error types.
Error(e.error).AddTo(enc)
return nil
}