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config.go
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config.go
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package config
import (
"fmt"
"os"
"strings"
"github.com/BurntSushi/toml"
)
var (
defaultPort = "5000"
)
type Config struct {
DatabaseURI string `toml:"database_uri"`
Port string `toml:"port"`
}
func Read(data string) (Config, error) {
var cfg Config
meta, err := toml.Decode(data, &cfg)
if err != nil {
return Config{}, err
}
// gather extra values
extra := []string{}
for _, keys := range meta.Undecoded() {
key := keys[0]
extra = append(extra, key)
}
// error upon extra values
if len(extra) > 0 {
msg := strings.Join(extra, ", ")
return Config{}, fmt.Errorf("extra config values: %s", msg)
}
// build set of present config keys
present := make(map[string]bool)
for _, keys := range meta.Keys() {
key := keys[0]
present[key] = true
}
required := []string{
"database_uri",
}
// gather missing values
missing := []string{}
for _, key := range required {
if _, ok := present[key]; !ok {
missing = append(missing, key)
}
}
// error upon missing values
if len(missing) > 0 {
msg := strings.Join(missing, ", ")
return Config{}, fmt.Errorf("missing config values: %s", msg)
}
// handle defaults
if cfg.Port == "" {
cfg.Port = defaultPort
}
return cfg, nil
}
func ReadFile(path string) (Config, error) {
data, err := os.ReadFile(path)
if err != nil {
return Config{}, err
}
return Read(string(data))
}