/
configError.go
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/
configError.go
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// Copyright 2017 Istio 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 adapter
import (
"fmt"
me "github.com/hashicorp/go-multierror"
)
// ConfigErrors is a collection of configuration errors
//
// The usage pattern for this type is pretty simple:
//
// func (a *adapterState) ValidateConfig(cfg adapter.AspectConfig) (ce *adapter.ConfigErrors) {
// c := cfg.(*Config)
// if c.Url == nil {
// ce = ce.Appendf("url", "Must have a valid URL")
// }
// if c.RetryCount < 0 {
// ce = ce.Appendf("retryCount", "Expecting >= 0, got %d", cfg.RetryCount)
// }
// return
// }
type ConfigErrors struct {
// Multi is the accumulator of errors
Multi *me.Error
}
// ConfigError represents an error encountered while validating a block of configuration state.
type ConfigError struct {
Field string
Underlying error
}
// Appendf adds a ConfigError to a multierror. This function is intended
// to be used by adapter's ValidateConfig method to report errors
// in configuration. The field parameter indicates the name of the
// specific configuration field name that is problematic.
func (e *ConfigErrors) Appendf(field, format string, args ...interface{}) *ConfigErrors {
ce := e
if ce == nil {
ce = &ConfigErrors{}
}
ce.Multi = me.Append(ce.Multi, ConfigError{field, fmt.Errorf(format, args...)})
return ce
}
// Append adds a ConfigError to a multierror. This function is intended
// to be used by adapter's ValidateConfig method to report errors
// in configuration. The field parameter indicates the name of the
// specific configuration field name that is problematic.
func (e *ConfigErrors) Append(field string, err error) *ConfigErrors {
ce := e
if ce == nil {
ce = &ConfigErrors{}
}
ce.Multi = me.Append(ce.Multi, ConfigError{field, err})
return ce
}
// Error returns a string representation of the configuration error.
func (e ConfigError) Error() string {
return fmt.Sprintf("%s: %s", e.Field, e.Underlying)
}
func (e ConfigError) String() string {
return e.Error()
}
func (e *ConfigErrors) Error() string {
if e == nil || e.Multi == nil {
return ""
}
return e.Multi.Error()
}
func (e *ConfigErrors) String() string {
return e.Error()
}
// Extend joins 2 configErrors together.
func (e *ConfigErrors) Extend(ee *ConfigErrors) *ConfigErrors {
if e == nil {
return ee
}
if ee != nil {
e.Multi = me.Append(e.Multi, ee.Multi.Errors...)
}
return e
}