forked from attestantio/dirk
/
parameters.go
110 lines (95 loc) · 2.79 KB
/
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 grpc
import (
"github.com/bliiitz/dirk/services/metrics"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
type parameters struct {
logLevel zerolog.Level
monitor metrics.SenderMonitor
name string
serverCert []byte
serverKey []byte
caCert []byte
}
// 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
})
}
// WithMonitor sets the monitor for this module.
func WithMonitor(monitor metrics.SenderMonitor) Parameter {
return parameterFunc(func(p *parameters) {
p.monitor = monitor
})
}
// WithName sets the name for this module.
func WithName(name string) Parameter {
return parameterFunc(func(p *parameters) {
p.name = name
})
}
// WithServerCert sets the server certificate for this module.
func WithServerCert(serverCert []byte) Parameter {
return parameterFunc(func(p *parameters) {
p.serverCert = serverCert
})
}
// WithServerKey sets the server key for this module.
func WithServerKey(serverKey []byte) Parameter {
return parameterFunc(func(p *parameters) {
p.serverKey = serverKey
})
}
// WithCACert sets the CA certificate for this module.
func WithCACert(caCert []byte) Parameter {
return parameterFunc(func(p *parameters) {
p.caCert = caCert
})
}
// 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.monitor == nil {
// Use no-op monitor.
parameters.monitor = &noopMonitor{}
}
if parameters.name == "" {
return nil, errors.New("no name specified")
}
if len(parameters.serverCert) == 0 {
return nil, errors.New("no server certificate specified")
}
if len(parameters.serverKey) == 0 {
return nil, errors.New("no server key specified")
}
return ¶meters, nil
}