feat(): added sql config server

config_server.go

@@ -3,6 +3,7 @@ package env
 import (
 	"encoding/json"
 	"errors"
+	"github.com/alfarih31/nb-go-env/internal"
 	"github.com/joho/godotenv"
 	"log"
 	"os"
@@ -34,11 +35,11 @@ func (dc defaultConfigServer) Get(k string) (string, bool) {
 	if dc.useDotEnv {
 		cfg, exist := dc.envs[k]
 
-		return cfg, !hasZeroValue(cfg) && exist
+		return cfg, !internal.HasZeroValue(cfg) && exist
 	}
 
 	cfg := os.Getenv(k)
-	return cfg, !hasZeroValue(cfg)
+	return cfg, !internal.HasZeroValue(cfg)
 }
 
 func NewDefaultConfigServer(envPath string, fallbackToWide ...bool) (ConfigServer, error) {

env.go

@@ -4,32 +4,12 @@ import (
 	"errors"
 	"fmt"
 	"github.com/alfarih31/nb-go-parser"
-	"reflect"
 )
 
 type Err struct {
 	e error
 }
 
-// HasZeroValue Check a variable has Zero Value
-func hasZeroValue(v interface{}) bool {
-	if v == nil {
-		return true
-	}
-
-	t := reflect.TypeOf(v)
-	if t == nil {
-		return true
-	}
-
-	switch t.Kind() {
-	case reflect.Map, reflect.Slice, reflect.Array:
-		return false
-	}
-
-	return v == reflect.Zero(t).Interface()
-}
-
 func (e *Err) Errorf(f string, s ...interface{}) *Err {
 	return &Err{
 		e: errors.New(fmt.Sprintf(fmt.Sprintf("this %s: %s", e.e.Error(), f), s...)),

examples/using-sql-config-server/go.mod

@@ -0,0 +1,10 @@
+module example
+
+go 1.19
+
+require (
+	github.com/alfarih31/nb-go-env v1.0.4 // indirect
+	github.com/alfarih31/nb-go-parser v1.0.11 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
+	github.com/lib/pq v1.10.9 // indirect
+)

examples/using-sql-config-server/go.sum

@@ -0,0 +1,8 @@
+github.com/alfarih31/nb-go-env v1.0.4 h1:jIrQUsunn9uUMecqHQaK1lMJ3XgEqa420HQSJkUkTlg=
+github.com/alfarih31/nb-go-env v1.0.4/go.mod h1:oPDLWPYpw2X/NVLoJfhr5KzZ3Wy+UPxKktOBIk7TL5s=
+github.com/alfarih31/nb-go-parser v1.0.11 h1:jW+pU/UH1pBwP/HSavsGhsVmIzEDS6cvmLiAAheKaao=
+github.com/alfarih31/nb-go-parser v1.0.11/go.mod h1:0+2qf5oT5sEy4qyNxY/ewsREpHtUYfis3/bERolDFGI=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=

examples/using-sql-config-server/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	env2 "github.com/alfarih31/nb-go-env"
+	sql_config_server "github.com/alfarih31/nb-go-env/sql-config-server"
+	_ "github.com/lib/pq"
+)
+
+const (
+	host      = "localhost"
+	port      = 5432
+	user      = "postgres"
+	password  = "postgres"
+	dbname    = "postgres"
+	namespace = "example"
+)
+
+func CheckError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func main() {
+	psqlconn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbname)
+
+	// open database
+	db, err := sql.Open("postgres", psqlconn)
+	CheckError(err)
+
+	// create config server
+	configService, err := sql_config_server.NewSqlConfigServer(db, "configs",
+		sql_config_server.WithNamespace(namespace),
+		sql_config_server.WithTableCreation(sql_config_server.DialectPostgres))
+
+	CheckError(err)
+
+	// seed the database
+	insertStmt := fmt.Sprintf(`insert into "configs"("key", "value", "namespace") values('foo', 'ba2', '%s')`, namespace)
+	_, e := db.Exec(insertStmt)
+	CheckError(e)
+
+	env, err := env2.LoadWithConfigServer(configService)
+	CheckError(err)
+
+	fmt.Printf("Config with key 'foo' -> '%s'\n", env.MustGetString("foo"))
+
+	db.Close()
+}

go.mod

@@ -10,6 +10,7 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/mattn/go-sqlite3 v1.14.17 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )

go.sum

@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/joho/godotenv v1.4.0 h1:3l4+N6zfMWnkbPEXKng2o2/MR5mSwTrBih4ZEkkz1lg=
 github.com/joho/godotenv v1.4.0/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
+github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

go.work

@@ -0,0 +1,6 @@
+go 1.19
+
+use (
+	examples/using-sql-config-server
+	.
+)

internal/helper.go

@@ -0,0 +1,22 @@
+package internal
+
+import "reflect"
+
+// HasZeroValue Check a variable has Zero Value
+func HasZeroValue(v interface{}) bool {
+	if v == nil {
+		return true
+	}
+
+	t := reflect.TypeOf(v)
+	if t == nil {
+		return true
+	}
+
+	switch t.Kind() {
+	case reflect.Map, reflect.Slice, reflect.Array:
+		return false
+	}
+
+	return v == reflect.Zero(t).Interface()
+}

sql-config-server/constants.go

@@ -0,0 +1,9 @@
+package sql_config_server
+
+type Dialect uint
+
+const (
+	DialectPostgres Dialect = iota
+	DialectMysql
+	DialectSqlite
+)

sql-config-server/options.go

@@ -0,0 +1,15 @@
+package sql_config_server
+
+type Option func(*sqlConfigServer)
+
+func WithTableCreation(dialect Dialect) Option {
+	return func(server *sqlConfigServer) {
+		server.dialect = &dialect
+	}
+}
+
+func WithNamespace(ns string) Option {
+	return func(server *sqlConfigServer) {
+		server.namespace = &ns
+	}
+}

sql-config-server/sql_config_server.go

@@ -0,0 +1,140 @@
+package sql_config_server
+
+import (
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	env "github.com/alfarih31/nb-go-env"
+	"github.com/alfarih31/nb-go-env/internal"
+	"log"
+)
+
+type sqlConfigServer struct {
+	tableName string
+	namespace *string
+	db        *sql.DB
+	dialect   *Dialect
+}
+
+type SqlConfigServer interface {
+	env.ConfigServer
+}
+
+func (s *sqlConfigServer) Get(key string) (string, bool) {
+	var r *sql.Row
+	if s.namespace != nil {
+		r = s.db.QueryRow(fmt.Sprintf(`SELECT value FROM "%s" WHERE key = '%s' AND namespace = '%s' ORDER BY id DESC LIMIT 1`, s.tableName, key, *s.namespace))
+	} else {
+		r = s.db.QueryRow(fmt.Sprintf(`SELECT value FROM "%s" WHERE key = '%s' ORDER BY id DESC LIMIT 1`, s.tableName, key))
+	}
+
+	var v string
+	if err := r.Scan(&v); err != nil {
+		log.Println(err)
+		return "", false
+	}
+
+	return v, !internal.HasZeroValue(v)
+}
+
+func (s *sqlConfigServer) Dump() (string, error) {
+	var (
+		rs  *sql.Rows
+		err error
+	)
+	if s.namespace != nil {
+		rs, err = s.db.Query(fmt.Sprintf(`SELECT key, value FROM "%s" WHERE namespace = '%s' ORDER BY id DESC`, s.tableName, *s.namespace))
+	} else {
+		rs, err = s.db.Query(fmt.Sprintf(`SELECT key, value FROM "%s" ORDER BY id DESC`, s.tableName))
+	}
+
+	if err != nil {
+		return "", err
+	}
+
+	configs := map[string]string{}
+	for rs.Next() {
+		var k, v string
+		if err = rs.Scan(&k, &v); err != nil {
+			return "", err
+		}
+		configs[k] = v
+	}
+
+	if err = rs.Close(); err != nil {
+		return "", err
+	}
+
+	j, e := json.Marshal(configs)
+
+	return string(j), e
+}
+
+func (s *sqlConfigServer) executeTableCreation() error {
+	if s.dialect != nil {
+		var createStmt string
+		switch *s.dialect {
+		case DialectPostgres:
+			createStmt = fmt.Sprintf(`
+  CREATE TABLE IF NOT EXISTS "%s" (
+  id SERIAL PRIMARY KEY,
+  namespace CHARACTER VARYING(511),
+  key VARCHAR(511) NOT NULL,
+  value TEXT NOT NULL
+  );`, s.tableName)
+		case DialectMysql:
+			createStmt = fmt.Sprintf(`
+  CREATE TABLE IF NOT EXISTS "%s" (
+  id INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  namespace VARCHAR(511),
+  key VARCHAR(511) NOT NULL,
+  value TEXT NOT NULL
+  );`, s.tableName)
+		case DialectSqlite:
+			createStmt = fmt.Sprintf(`
+  CREATE TABLE IF NOT EXISTS "%s" (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  namespace VARCHAR(511),
+  key VARCHAR(511) NOT NULL,
+  value TEXT NOT NULL
+  );`, s.tableName)
+		default:
+			return errors.New("unknown dialect")
+		}
+
+		_, err := s.db.Exec(createStmt)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+
+	return nil
+}
+
+func (s *sqlConfigServer) init() error {
+	if err := s.executeTableCreation(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func NewSqlConfigServer(db *sql.DB, tableName string, opts ...Option) (SqlConfigServer, error) {
+	cs := &sqlConfigServer{
+		db:        db,
+		tableName: tableName,
+	}
+
+	for _, opt := range opts {
+		opt(cs)
+	}
+
+	if err := cs.init(); err != nil {
+		return nil, err
+	}
+
+	return cs, nil
+}