Feat: Allow to setup Graphjin with a pre-existing Postgres databse #382

New argument `-db-url` on the `new` sub-command allows you to point a new app
to a local database.
Eg. graphjin new testapp --db-url=postgres://user:pass@localhost/testapp-development

internal/cmd/cmd_new.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"bytes"
 	"embed"
+	"net/url"
 	"os"
 	"path"
 	"strings"
@@ -13,13 +14,19 @@ import (
 	"golang.org/x/text/language"
 )
 
+var (
+	dbURL string
+)
+
 func newCmd() *cobra.Command {
 	c := &cobra.Command{
 		Use:   "new <app-name>",
 		Short: "Create a new application",
 		Long:  "Generate all the required files to start on a new GraphJin app",
 		Run:   cmdNew,
 	}
+
+	c.PersistentFlags().StringVar(&dbURL, "db-url", "", "URL of the database")
 	return c
 }
 
@@ -29,10 +36,55 @@ func cmdNew(cmd *cobra.Command, args []string) {
 		os.Exit(1)
 	}
 
+	dbType := "postgres"
+	dbHost := "db"
+	dbPort := "5432"
+	dbName := ""
+	dbUser := "postgres"
+	dbPass := "postgres"
+
+	if dbURL != "" {
+		u, err := url.Parse(dbURL)
+		if err != nil {
+			log.Fatal(err)
+		}
+		dbType = u.Scheme
+		dbHost = u.Host
+
+		if v := u.Port(); v != "" {
+			dbPort = v
+		} else if dbType == "mysql" {
+			dbPort = "3306"
+		}
+
+		if v := u.User.Username(); v != "" {
+			dbUser = v
+		} else if dbType == "mysql" {
+			dbPort = "root"
+		}
+
+		if v, ok := u.User.Password(); ok {
+			dbPass = v
+		} else if dbType == "mysql" {
+			dbPort = ""
+		}
+
+		if v := u.Path; len(v) > 1 {
+			dbName = v[1:]
+		}
+	}
+
 	en := cases.Title(language.English)
-	tmpl := newTempl(map[string]string{
+	tmpl := newTempl(map[string]interface{}{
 		"AppName":     en.String(strings.Join(args, " ")),
 		"AppNameSlug": strings.ToLower(strings.Join(args, "_")),
+		"CreateDB":    (dbURL == ""),
+		"DBType":      dbType,
+		"DBHost":      dbHost,
+		"DBPort":      dbPort,
+		"DBUser":      dbUser,
+		"DBPass":      dbPass,
+		"DBName":      dbName,
 	})
 
 	// Create app folder and add relevant files
@@ -139,10 +191,10 @@ func cmdNew(cmd *cobra.Command, args []string) {
 var tmpl embed.FS
 
 type Templ struct {
-	values map[string]string
+	values map[string]interface{}
 }
 
-func newTempl(values map[string]string) *Templ {
+func newTempl(values map[string]interface{}) *Templ {
 	return &Templ{values}
 }
 

internal/cmd/cmd_serv.go

@@ -14,13 +14,13 @@ func servCmd() *cobra.Command {
 		Use:     "serve",
 		Aliases: []string{"serv"},
 		Short:   "Run the GraphJin service",
-		RunE:    cmdServ,
+		Run:     cmdServ,
 	}
 	c.Flags().BoolVar(&deployActive, "deploy-active", false, "Deploy active config")
 	return c
 }
 
-func cmdServ(*cobra.Command, []string) error {
+func cmdServ(*cobra.Command, []string) {
 	setup(cpath)
 
 	var opt []serv.Option
@@ -30,11 +30,10 @@ func cmdServ(*cobra.Command, []string) error {
 
 	gj, err := serv.NewGraphJinService(conf, opt...)
 	if err != nil {
-		return err
+		log.Fatalf("%s", err)
 	}
 
 	if err := gj.Start(); err != nil {
-		return err
+		log.Fatalf("%s", err)
 	}
-	return nil
 }

internal/cmd/tmpl/dev.yml

@@ -193,12 +193,16 @@ auths:
 # GJ_DATABASE_PASSWORD
 
 database:
-  type: postgres
-  host: db
-  port: 5432
+  type: {{ .DBType }}
+  host: {{ .DBHost }}
+  port: {{ .DBPort }}
+  {{- if eq .DBName "" }}
   dbname: {{ .AppNameSlug -}}_development
-  user: postgres
-  password: postgres 
+  {{- else }}
+  dbname: {{ .DBName }}
+  {{- end }}
+  user: {{ .DBUser }}
+  password: {{ .DBPass }}
   #schema: "public"
 
   # Size of database connection pool

internal/cmd/tmpl/docker-compose.yml

@@ -1,5 +1,5 @@
-version: "3.4"
 services:
+  {{- if .CreateDB }}
   # Postgres DB
   db:
     image: postgres:12
@@ -9,6 +9,7 @@ services:
     ports:
       - "5432:5432"
 
+  {{- end }}
   api:
     image: dosco/graphjin:latest
     command: serve
@@ -18,5 +19,7 @@ services:
       - ./config:/home/nonroot/config
     ports:
       - "8080:8080"
+    {{- if .CreateDB }}
     depends_on:
       - db
+    {{- end }}

internal/cmd/tmpl/prod.yml

@@ -104,12 +104,16 @@ hot_deploy: true
 #     sample: 0.6
 
 database:
-  type: postgres
-  host: db
-  port: 5432
+  type: {{ .DBType }}
+  host: {{ .DBHost }}
+  port: {{ .DBPort }}
+  {{- if eq .DBName "" }}
   dbname: {{ .AppNameSlug -}}_production
-  user: postgres
-  password: postgres
+  {{- else }}
+  dbname: {{ .DBName }}
+  {{- end }}
+  user: {{ .DBUser }}
+  password: {{ .DBPass }}
   #schema: "public"
 
   # Size of database connection pool