Files
job-search/internal/config/load.go
T

115 lines
3.1 KiB
Go

package config
import (
"fmt"
"log/slog"
"os"
"strings"
"github.com/joho/godotenv"
"github.com/spf13/viper"
)
// envKeyReplacer turns a dotted key into its environment variable's suffix
// (logging.level to LOGGING_LEVEL, once upper-cased).
var envKeyReplacer = strings.NewReplacer(".", "_")
// envVarName returns the environment variable that sets key, e.g.
// JOBSEARCH_LOGGING_LEVEL for logging.level.
func envVarName(key string) string {
return EnvPrefix + "_" + strings.ToUpper(envKeyReplacer.Replace(key))
}
// isExplicitlySet reports whether key's value in Viper was set by the config
// file or by its environment variable, rather than coming from its default.
// As Viper does, it ignores an empty environment variable. Values set with
// viper.Set (e.g. by StoreValue) are not counted.
func isExplicitlySet(key string) bool {
if viper.InConfig(key) {
return true
}
value, ok := os.LookupEnv(envVarName(key))
return ok && value != ""
}
// loadEnv loads environment variables from a .env file in the working
// directory.
func loadEnv() error {
if err := godotenv.Load(); err != nil {
return fmt.Errorf("invalid .env file: %w", err)
}
return nil
}
// loadConfig sets up Viper with the defaults, cfgFile (or config.* found in
// EtcConfigPath or the working directory) and JOBSEARCH_* environment
// variables. A missing config file is only a warning.
func loadConfig(cfgFile string) error {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Search config in /etc or local directory.
viper.AddConfigPath(EtcConfigPath)
viper.AddConfigPath(".")
viper.SetConfigName("config")
}
// Load default configuration
LoadDefaultConfig()
viper.SetEnvPrefix(EnvPrefix)
viper.SetEnvKeyReplacer(envKeyReplacer)
viper.AutomaticEnv() // read in environment variables that match
err := viper.ReadInConfig()
if err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok {
// Indicates an explicitly set config file is not found or
// that no config file was found in any search path
slog.Warn("No config file found!")
} else {
// Config file was found but another error was produced
return err
}
} else {
// Config file found and successfully parsed
slog.Info("Using config file: " + viper.ConfigFileUsed())
}
return nil
}
// Init loads the .env file and the configuration (see loadConfig) into conf.
// A debug or error log level already set in conf, from --debug or --quiet,
// is kept over the loaded one.
func Init(cfgFile string, conf *JobSearchConfig) error {
if err := loadEnv(); err != nil {
return err
}
if conf.Logging.LogLevel() <= slog.LevelDebug {
printEnv()
}
if err := loadConfig(cfgFile); err != nil {
return err
}
// Load configuration from Viper, ensure -debug and -quiet are retained
oldLogLevel := conf.Logging.LogLevel()
LoadFromViper(conf)
if oldLogLevel == slog.LevelDebug {
conf.Logging.Level = "debug"
}
if oldLogLevel == slog.LevelError {
conf.Logging.Level = "error"
}
if conf.Logging.LogLevel() <= slog.LevelDebug {
printLoadedConfig()
printConfig(*conf)
}
return nil
}