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// file: datasource/users.go
package datasource
import (
// Engine is from where to fetch the data, in this case the users.
type Engine uint32
const (
// Memory stands for simple memory location;
// map[int64] datamodels.User ready to use, it's our source in this example.
Memory Engine = iota
// Bolt for boltdb source location.
// MySQL for mysql-compatible source location.
// LoadUsers returns all users(empty map) from the memory, for the shake of simplicty.
func LoadUsers(engine Engine) (map[int64]datamodels.User, error) {
if engine != Memory {
return nil, errors.New("for the shake of simplicity we're using a simple map as the data source")
return make(map[int64]datamodels.User), nil
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