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/
config.go
84 lines (70 loc) · 2.51 KB
/
config.go
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// Copyright 2020 the Exposure Notifications Verification Server 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 config defines the environment baased configuration for this project.
// Each server has a unique config type.
package config
import (
"context"
"fmt"
"time"
"github.com/google/exposure-notifications-server/pkg/secrets"
"github.com/sethvargo/go-envconfig"
)
// Validatable indicates that a type can be validated.
type Validatable interface {
Validate() error
}
// ProcessWith creates a new config with the given lookuper for parsing config.
func ProcessWith(ctx context.Context, spec interface{}, l envconfig.Lookuper) error {
// Build a list of mutators. This list will grow as we initialize more of the
// configuration, such as the secret manager.
var mutatorFuncs []envconfig.MutatorFunc
{
// Load the secret manager configuration first - this needs to be loaded first
// because other processors may need secrets.
var smConfig secrets.Config
if err := envconfig.ProcessWith(ctx, &smConfig, l); err != nil {
return fmt.Errorf("unable to process secret configuration: %w", err)
}
sm, err := secrets.SecretManagerFor(ctx, &smConfig)
if err != nil {
return fmt.Errorf("unable to connect to secret manager: %w", err)
}
// Enable caching, if a TTL was provided.
if ttl := smConfig.SecretCacheTTL; ttl > 0 {
sm, err = secrets.WrapCacher(ctx, sm, ttl)
if err != nil {
return fmt.Errorf("unable to create secret manager cache: %w", err)
}
}
// Update the mutators to process secrets.
mutatorFuncs = append(mutatorFuncs, secrets.Resolver(sm, &smConfig))
}
// Parse the main configuration.
if err := envconfig.ProcessWith(ctx, spec, l, mutatorFuncs...); err != nil {
return err
}
if typ, ok := spec.(Validatable); ok {
if err := typ.Validate(); err != nil {
return err
}
}
return nil
}
func checkPositiveDuration(d time.Duration, name string) error {
if d < 0 {
return fmt.Errorf("%v must be a positive duration, got: %v", name, d)
}
return nil
}