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error_behavior.go
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/
error_behavior.go
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// Copyright (c) 2019 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 storage
import "fmt"
var (
// NB: Container behavior must not be defined in configs, so it does not count
// as a parsable behavior. This is because it's a composite storage type that
// refers to fanout storage, and requires further parsing to determine error
// behavior.
parsableErrorBehaviors = []ErrorBehavior{
BehaviorFail,
BehaviorWarn,
}
)
func (e ErrorBehavior) String() string {
switch e {
case BehaviorFail:
return "fail"
case BehaviorWarn:
return "warn"
case BehaviorContainer:
return "container"
default:
return "unknown"
}
}
// ParseErrorBehavior parses an error behavior.
func ParseErrorBehavior(str string) (ErrorBehavior, error) {
for _, valid := range parsableErrorBehaviors {
if str == valid.String() {
return valid, nil
}
}
return 0, fmt.Errorf("unrecognized error behavior: %v", str)
}
// UnmarshalYAML unmarshals an error behavior.
func (e *ErrorBehavior) UnmarshalYAML(unmarshal func(interface{}) error) error {
var str string
if err := unmarshal(&str); err != nil {
return err
}
if value, err := ParseErrorBehavior(str); err == nil {
*e = value
return nil
}
return fmt.Errorf("invalid ErrorBehavior '%s' valid types are: %v",
str, parsableErrorBehaviors)
}
// IsWarning determines if the given error coming from the storage is a warning,
// and returns it with appropriate wrapping.
func IsWarning(store Storage, err error) (bool, error) {
if _, ok := err.(warnError); ok {
return true, err
}
if store.ErrorBehavior() == BehaviorWarn {
return true, warnError{err}
}
return false, err
}
// warnError is an error that should only warn on failure.
type warnError struct {
inner error
}
func (e warnError) Error() string {
return e.inner.Error()
}