weather/internal/config.go

61 lines
1.8 KiB
Go

package internal
import (
"fmt"
"go/weather/internal/storage"
"io/ioutil"
"os"
"path/filepath"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/gohcl"
"github.com/hashicorp/hcl/v2/hclsyntax"
"go.uber.org/zap"
)
//WeatherConfig weather application relative configuration file
// this configuration is common to weather server and poller
type WeatherConfig struct {
OpenweatherSecret string `hcl:"openweather_secret"`
S3Storage *storage.WeatherS3StorageConfig `hcl:"s3,block"`
}
//ParseConfiguration parse configuration from filename path
func ParseConfiguration(sLogger *zap.SugaredLogger, filename string) *WeatherConfig {
dir, err := os.Getwd()
if err != nil {
sLogger.Fatalw("Fail to determine current directory to load default ./config.hcl file", zap.Error(err))
}
sLogger.Debugf("current dir is %s", dir)
if filename == "config.hcl" {
filename = fmt.Sprintf("%s%c%s", dir, os.PathSeparator, filename)
}
relativeFilename, err := filepath.Rel(dir, filename)
if err != nil {
sLogger.Fatalw(fmt.Sprintf("Fail to determine configuration relative directory for file %s", filename), zap.Error(err))
}
src, err := ioutil.ReadFile(relativeFilename)
if err != nil {
sLogger.Fatalw(fmt.Sprintf("Missing required parameter filename got : %s", relativeFilename), zap.Error(err))
}
file, diags := hclsyntax.ParseConfig(src, relativeFilename, hcl.Pos{Line: 1, Column: 1})
if diags.HasErrors() {
sLogger.Fatal("config parse", zap.Error(diags))
}
config := &WeatherConfig{}
diags = gohcl.DecodeBody(file.Body, nil, config)
if diags.HasErrors() {
sLogger.Fatal("config decode", zap.Error(diags))
}
if config.OpenweatherSecret == "" {
sLogger.Fatal("Missing required parameter : openweather-secret")
}
return config
}