forked from attestantio/dirk
/
parameters.go
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/
parameters.go
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// Copyright © 2020 Attestant Limited.
// 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 standard
import (
"errors"
"github.com/rs/zerolog"
)
type parameters struct {
logLevel zerolog.Level
storagePath string
adminIPs []string
}
// Parameter is the interface for service parameters.
type Parameter interface {
apply(*parameters)
}
type parameterFunc func(*parameters)
func (f parameterFunc) apply(p *parameters) {
f(p)
}
// WithLogLevel sets the log level for the module.
func WithLogLevel(logLevel zerolog.Level) Parameter {
return parameterFunc(func(p *parameters) {
p.logLevel = logLevel
})
}
// WithStoragePath sets the storage path for the module.
func WithStoragePath(storagePath string) Parameter {
return parameterFunc(func(p *parameters) {
p.storagePath = storagePath
})
}
// WithAdminIPs sets the administration IP addreses for the module.
func WithAdminIPs(adminIPs []string) Parameter {
return parameterFunc(func(p *parameters) {
p.adminIPs = adminIPs
})
}
// parseAndCheckParameters parses and checks parameters to ensure that mandatory parameters are present and correct.
func parseAndCheckParameters(params ...Parameter) (*parameters, error) {
parameters := parameters{
logLevel: zerolog.GlobalLevel(),
}
for _, p := range params {
if params != nil {
p.apply(¶meters)
}
}
if parameters.storagePath == "" {
return nil, errors.New("no storage path specified")
}
return ¶meters, nil
}