/
config.go
125 lines (102 loc) · 3.32 KB
/
config.go
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// Copyright 2023 Igor Zibarev
//
// 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 auditum
import (
"fmt"
"os"
"strings"
"github.com/knadh/koanf/parsers/yaml"
"github.com/knadh/koanf/providers/env"
"github.com/knadh/koanf/providers/file"
"github.com/knadh/koanf/providers/structs"
"github.com/knadh/koanf/v2"
"github.com/auditumio/auditum/internal/aud"
)
const (
envPrefix = "AUDITUM_"
envConfigFilepath = envPrefix + "CONFIG"
)
type Configuration struct {
Log LogConfig `yaml:"log" json:"log"`
Tracing TracingConfig `yaml:"tracing" json:"tracing"`
HTTP HTTPConfig `yaml:"http" json:"http"`
GRPC GRPCConfig `yaml:"grpc" json:"grpc"`
Store StoreConfig `yaml:"store" json:"store"`
Settings aud.Settings `yaml:"settings" json:"settings"`
// Note: json tag in structs is used by validation package.
}
func (c Configuration) Validate() error {
if err := c.Log.Validate(); err != nil {
return fmt.Errorf("invalid 'log': %v", err)
}
if err := c.Tracing.Validate(); err != nil {
return fmt.Errorf("invalid 'tracing': %v", err)
}
if err := c.HTTP.Validate(); err != nil {
return fmt.Errorf("invalid 'http': %v", err)
}
if err := c.GRPC.Validate(); err != nil {
return fmt.Errorf("invalid 'grpc': %v", err)
}
if err := c.Store.Validate(); err != nil {
return fmt.Errorf("invalid 'store': %v", err)
}
if err := c.Settings.Validate(); err != nil {
return fmt.Errorf("invalid 'settings': %v", err)
}
return nil
}
// NOTE: must be in sync with config/auditum.yaml
var defaultConfig = Configuration{
Log: defaultLogConfig,
Tracing: defaultTracingConfig,
HTTP: defaultHTTPConfig,
GRPC: defaultGRPCConfig,
Store: defaultStoreConfig,
Settings: aud.DefaultSettings,
}
func loadConfiguration(fpath string) (*Configuration, error) {
if fpath == "" {
fpath = os.Getenv(envConfigFilepath)
}
// Load configuration from sources, considering default configuration.
// Then save it into the structure.
k := koanf.New(".")
if err := k.Load(structs.Provider(defaultConfig, "yaml"), nil); err != nil {
return nil, fmt.Errorf("load default configuration: %v", err)
}
if fpath != "" {
if err := k.Load(file.Provider(fpath), yaml.Parser()); err != nil {
return nil, fmt.Errorf("load yaml file configuration: %v", err)
}
}
if err := k.Load(env.Provider(envPrefix, ".", func(s string) string {
return strings.ReplaceAll(
strings.TrimPrefix(s, envPrefix),
"_",
".",
)
}), nil); err != nil {
return nil, fmt.Errorf("load environment variables configuration: %v", err)
}
var conf Configuration
if err := k.Unmarshal("", &conf); err != nil {
return nil, fmt.Errorf("unmarshal merged configuration: %v", err)
}
// Validate configuration.
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("validate config: %v", err)
}
return &conf, nil
}