Add utils and config

model/config.go

@@ -0,0 +1,49 @@
+package model
+
+import (
+	"fmt"
+	"io/ioutil"
+
+	"gopkg.in/yaml.v2"
+)
+
+const (
+	DefaultPort = 8080
+)
+
+type Config struct {
+	DatabasePath *string `yaml:"database_path"`
+	Port         *int    `yaml:"port"`
+}
+
+func (c *Config) SetDefaults() {
+	if c.Port == nil {
+		c.Port = NewInt(DefaultPort)
+	}
+}
+
+func (c *Config) IsValid() error {
+	if c.DatabasePath == nil || *c.DatabasePath == "" {
+		return fmt.Errorf("database_path cannot be empty")
+	}
+
+	if c.Port == nil || *c.Port == 0 {
+		return fmt.Errorf("port cannot be empty")
+	}
+
+	return nil
+}
+
+func ReadConfig(path string) (*Config, error) {
+	b, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var config Config
+	if err := yaml.Unmarshal(b, &config); err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}

model/utils.go

@@ -4,6 +4,9 @@ import (
 	"github.com/google/uuid"
 )
 
+func NewString(s string) *string { return &s }
+func NewInt(i int) *int          { return &i }
+
 func NewID() string {
 	return uuid.New().String()
 }