Makes config testable

config/config-sample.yaml

@@ -0,0 +1,11 @@
+app:
+    environment: "devel"
+    port: 8080
+
+db:
+    type: "type"
+    host: "host"
+    port: 1234
+    user: USER
+    password: PASSWORD
+    database: gogmagog

config/config.go

@@ -7,40 +7,54 @@ import (
 	"github.com/spf13/viper"
 )
 
-// Key represents a particular config flag.
-type Key string
-
-// These constants are the list of keys that can be used.
-const (
-	Environment Key = `app.environment`
-	Port        Key = `app.port`
-	DBType      Key = `db.type`
-	DBHost      Key = `db.host`
-	DBPort      Key = `db.port`
-	DBUser      Key = `db.user`
-	DBPassword  Key = `db.password`
-	DBDatabase  Key = `db.database`
-)
-
-// GetString returns the string value of the provided config key.
-func (k Key) GetString() string {
-	return viper.GetString(string(k))
+// AppConfig represents the config flags for the base application.
+type AppConfig struct {
+	Environment string
+	Port        string
 }
 
-// Init sets all of the viper config parameters.
-func Init() {
+// DBConfig is the config for the DB connection.
+type DBConfig struct {
+	Type     string
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Database string
+}
 
-	viper.SetDefault(string(Environment), "local")
-	viper.SetDefault(string(Port), "8080")
+// Conf represents the overall configuration of the application.
+type Conf struct {
+	App AppConfig
+	Db  DBConfig
+}
 
-	log.Print("Initialising config...")
-	viper.SetConfigName("config")
-	viper.SetConfigType("yaml")
-	viper.AddConfigPath(".")
+// GetConf returns config values
+func GetConf(filename string) *Conf {
 
-	err := viper.ReadInConfig()
+	cnf := &Conf{
+		App: AppConfig{
+			Environment: "local",
+			Port:        "8080",
+		},
+	}
+
+	vv := viper.New()
+	vv.SetConfigName(filename)
+	vv.SetConfigType("yaml")
+	vv.AddConfigPath(".")
+	log.Printf("Initialising config with filename %s", filename)
+
+	err := vv.ReadInConfig()
 	if err != nil {
-		log.Fatal("Could not read config file: \n", err)
+		log.Fatal("Could not load config file: \n", err)
 		os.Exit(1)
 	}
+
+	err = vv.Unmarshal(&cnf)
+	if err != nil {
+		log.Fatal("Could not read config file into struct: \n", err)
+		os.Exit(1)
+	}
+	return cnf
 }

config/config_test.go

@@ -1,10 +1,26 @@
 package config_test
 
 import (
-	"log"
 	"testing"
+	"github.com/stretchr/testify/assert"
+
+	"gitea.deepak.science/deepak/gogmagog/config"
 )
 
 func TestTrue(t *testing.T) {
-	log.Print("no real test")
+	assert := assert.New(t)
+
+	conf := config.GetConf("config-sample")
+
+	appConf := conf.App
+	assert.Equal("devel", appConf.Environment)
+	assert.Equal("8080", appConf.Port)
+
+	dbConf := conf.Db
+	assert.Equal("type", dbConf.Type)
+	assert.Equal("host", dbConf.Host)
+	assert.Equal("1234", dbConf.Port)
+	assert.Equal("USER", dbConf.User)
+	assert.Equal("PASSWORD", dbConf.Password)
+	assert.Equal("gogmagog", dbConf.Database)
 }

db/postgres.go

@@ -23,19 +23,19 @@ type postgresStore struct {
 }
 
 // GetStore provides a store to back the model based on a postgres connection.
-func GetStore() models.Store {
+func GetStore(dbConf *config.DBConfig) models.Store {
 
-	if config.DBType.GetString() != "postgres" {
-		log.Fatalf("Unsupported database type: " + config.DBType.GetString())
+	if dbConf.Type != "postgres" {
+		log.Fatalf("Unsupported database type: " + dbConf.Type)
 		os.Exit(1)
 	}
 
 	connStr := fmt.Sprintf("user=%s password=%s host=%s port=%s database=%s sslmode=disable",
-		config.DBUser.GetString(),
-		config.DBPassword.GetString(),
-		config.DBHost.GetString(),
-		config.DBPort.GetString(),
-		config.DBDatabase.GetString())
+		dbConf.User,
+		dbConf.Password,
+		dbConf.Host,
+		dbConf.Port,
+		dbConf.Database)
 
 	tmp, err := sql.Open("pgx", connStr)
 	if err != nil {

db/postgres_test.go

@@ -1,10 +1 @@
 package db_test
-
-import (
-	"log"
-	"testing"
-)
-
-func TestTrue(t *testing.T) {
-	log.Print("no real test")
-}

main.go

@@ -9,15 +9,17 @@ import (
 
 func main() {
 	// Config
-	config.Init()
-	port := config.Port.GetString()
-	env := config.Environment.GetString()
+	conf := config.GetConf("config")
+
+	appConf := conf.App
+	port := appConf.Port
+	env := appConf.Environment
 
 	log.Print("Running server on " + port)
 	log.Print("App environment is " + env)
 
 	// DB
-	store := db.GetStore()
+	store := db.GetStore(&conf.Db)
 
 	if store != nil {
 		log.Print("Got DB connection")