Files
musenalm/app/config.go
2025-02-09 20:13:52 +01:00

102 lines
2.0 KiB
Go

package app
import (
"encoding/json"
"fmt"
"github.com/Theodor-Springmann-Stiftung/musenalm/helpers"
"github.com/kelseyhightower/envconfig"
"log/slog"
"os"
)
// WARNING: this is not intended to be used in a multi-threaded environment
// Instatiate this once on startup before any goroutines are started
const (
DEFAULT_PORT = "8080"
DEFAULT_ADDR = "localhost"
DEFAULT_HTTPS = false
ENV_PREFIX = "MUSENALM"
)
type ConfigProvider struct {
Files []string
DevFiles []string
*Config
}
type Config struct {
// At least one of these should be set
Debug bool `json:"debug,omitempty" envconfig:"DEBUG"`
AllowTestLogin bool `json:"allow_test_login,omitempty" envconfig:"ALLOW_TEST_LOGIN"`
}
func NewConfigProvider(files []string, devfiles []string) *ConfigProvider {
return &ConfigProvider{Files: files, DevFiles: devfiles}
}
func (c *ConfigProvider) Read() error {
c.Config = &Config{}
for _, file := range c.Files {
conf, err := readSettingsFile(file)
if err == nil {
c.Config = conf
} else {
panic(err)
}
}
for _, file := range c.DevFiles {
conf, err := readSettingsFile(file)
if c.Debug {
if err == nil {
c.Config = conf
} else {
panic(err)
}
}
}
c.Config = readSettingsEnv(c.Config)
c.Config = readDefaults(c.Config)
return nil
}
func (c *ConfigProvider) Validate() error {
return nil
}
func readSettingsFile(path string) (*Config, error) {
cfg := &Config{}
f, err := os.Open(path)
if err != nil {
slog.Error("Error opening config file ", "path", path, "error", err)
return cfg, err
}
defer f.Close()
dec := json.NewDecoder(f)
err = dec.Decode(cfg)
helpers.Assert(err, "Error decoding config file")
return cfg, nil
}
func readSettingsEnv(cfg *Config) *Config {
_ = envconfig.Process(ENV_PREFIX, cfg)
return cfg
}
func readDefaults(cfg *Config) *Config {
return cfg
}
// Implement stringer
func (c *Config) String() string {
json, err := json.MarshalIndent(c, "", " ")
if err != nil {
return fmt.Sprintf("Error marshalling config: %v", err)
}
return string(json)
}