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config_gen.go
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config_gen.go
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package main
import (
"errors"
"fmt"
"os"
"strconv"
)
var (
ErrInvalidBuildType = errors.New("invalid build type")
ErrKeyNotFound = errors.New("env var key not found")
)
func NewConfig() (*Config, error) {
var (
err error
c *Config
)
c.Host, err = ParseStringOptional("localhost", "HOST")
if err != nil {
return c, err
}
c.Port, err = ParseIntOptional("3000", "PORT")
if err != nil {
return c, err
}
c.DataStore, err = NewDataStoreConfig("DATA_STORE")
if err != nil {
return c, err
}
return c, err
}
func NewDataStoreConfig(prefix string) (*DataStoreConfig, error) {
var (
err error
c *DataStoreConfig
)
c.Type, err = ParseStringRequired(prefix + "_TYPE")
if err != nil {
return c, err
}
c.MemDataStoreConfig, err = NewMemDataStoreConfig(prefix + "_MEM")
if err != nil {
return c, err
}
c.SqliteDataStoreConfig, err = NewSqliteDataStoreConfig(prefix + "_SQLITE")
if err != nil {
return c, err
}
return c, err
}
func (c *DataStoreConfig) Build() (DataStore, error) {
switch c.Type {
case "MEM":
return c.NewMemDataStore()
case "SQLITE":
return c.NewSqliteDataStore()
default:
return nil, fmt.Errorf("%w: %v", ErrInvalidBuildType, c.Type)
}
}
func NewMemDataStoreConfig(prefix string) (*MemDataStoreConfig, error) {
var (
err error
c *MemDataStoreConfig
)
return c, err
}
func NewSqliteDataStoreConfig(prefix string) (*SqliteDataStoreConfig, error) {
var (
err error
c *SqliteDataStoreConfig
)
c.Filename, err = ParseStringOptional("data.db", prefix+"_FILENAME")
if err != nil {
return c, err
}
return c, err
}
func ParseStringOptional(def, key string) (string, error) {
v, ok := os.LookupEnv(key)
if !ok {
v = def
}
return v, nil
}
func ParseIntOptional(def, key string) (int, error) {
v, ok := os.LookupEnv(key)
if !ok {
v = def
}
v64, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return 0, err
}
return int(v64), nil
}
func ParseStringRequired(key string) (string, error) {
v, ok := os.LookupEnv(key)
if !ok {
return "", fmt.Errorf("%w: %v", ErrKeyNotFound, key)
}
return v, nil
}