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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 (
"github.com/bliiitz/dirk/services/checker"
"github.com/bliiitz/dirk/services/fetcher"
"github.com/bliiitz/dirk/services/metrics"
"github.com/bliiitz/dirk/services/peers"
"github.com/bliiitz/dirk/services/sender"
"github.com/bliiitz/dirk/services/unlocker"
"github.com/pkg/errors"
"github.com/rs/zerolog"
keystorev4 "github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)
type parameters struct {
logLevel zerolog.Level
monitor metrics.ProcessMonitor
checker checker.Service
fetcher fetcher.Service
sender sender.Service
unlocker unlocker.Service
encryptor e2wtypes.Encryptor
id uint64
peers peers.Service
stores []e2wtypes.Store
generationPassphrase []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.ProcessMonitor) Parameter {
return parameterFunc(func(p *parameters) {
p.monitor = monitor
})
}
// WithChecker sets the checker for this module.
func WithChecker(checker checker.Service) Parameter {
return parameterFunc(func(p *parameters) {
p.checker = checker
})
}
// WithFetcher sets the account fetcher for this module.
func WithFetcher(fetcher fetcher.Service) Parameter {
return parameterFunc(func(p *parameters) {
p.fetcher = fetcher
})
}
// WithSender sets the sender for this module.
func WithSender(sender sender.Service) Parameter {
return parameterFunc(func(p *parameters) {
p.sender = sender
})
}
// WithUnlocker sets the unlocker for this module.
func WithUnlocker(unlocker unlocker.Service) Parameter {
return parameterFunc(func(p *parameters) {
p.unlocker = unlocker
})
}
// WithEncryptor sets the encryptor for this module.
func WithEncryptor(encryptor e2wtypes.Encryptor) Parameter {
return parameterFunc(func(p *parameters) {
p.encryptor = encryptor
})
}
// WithPeers sets the peers for this module.
func WithPeers(peers peers.Service) Parameter {
return parameterFunc(func(p *parameters) {
p.peers = peers
})
}
// WithID sets the ID for this module.
func WithID(id uint64) Parameter {
return parameterFunc(func(p *parameters) {
p.id = id
})
}
// WithStores sets the stores for this module.
func WithStores(stores []e2wtypes.Store) Parameter {
return parameterFunc(func(p *parameters) {
p.stores = stores
})
}
// WithGenerationPassphrase sets the generation passphrase for this module.
func WithGenerationPassphrase(generationPassphrase []byte) Parameter {
return parameterFunc(func(p *parameters) {
p.generationPassphrase = generationPassphrase
})
}
// 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(),
encryptor: keystorev4.New(),
}
for _, p := range params {
if params != nil {
p.apply(¶meters)
}
}
if parameters.monitor == nil {
// Use no-op monitor.
parameters.monitor = &noopMonitor{}
}
if parameters.checker == nil {
return nil, errors.New("no checker specified")
}
if parameters.fetcher == nil {
return nil, errors.New("no fetcher specified")
}
if parameters.sender == nil {
return nil, errors.New("no sender specified")
}
if parameters.unlocker == nil {
return nil, errors.New("no unlocker specified")
}
if parameters.encryptor == nil {
return nil, errors.New("no encryptor specified")
}
if parameters.id == 0 {
return nil, errors.New("no ID specified")
}
if parameters.peers == nil {
return nil, errors.New("no peers specified")
}
if parameters.stores == nil {
return nil, errors.New("no stores specified")
}
return ¶meters, nil
}