Implement session locking with --lock-session option

main.go

@@ -7,6 +7,7 @@ import (
 	"os/signal"
 
 	"github.com/gin-gonic/gin"
+	"github.com/jessevdk/go-flags"
 
 	"github.com/sosedoff/pgweb/pkg/api"
 	"github.com/sosedoff/pgweb/pkg/client"
@@ -54,6 +55,12 @@ func initClient() {
 func initOptions() {
 	err := command.ParseOptions()
 	if err != nil {
+		switch err.(type) {
+		case *flags.Error:
+			// no need to print error, flags package already does that
+		default:
+			fmt.Println(err.Error())
+		}
 		os.Exit(1)
 	}
 

pkg/api/api.go

@@ -68,6 +68,11 @@ func GetSessions(c *gin.Context) {
 }
 
 func Connect(c *gin.Context) {
+	if command.Opts.LockSession {
+		c.JSON(400, Error{"Session is locked"})
+		return
+	}
+
 	var sshInfo *shared.SSHInfo
 	url := c.Request.FormValue("url")
 
@@ -114,6 +119,11 @@ func Connect(c *gin.Context) {
 }
 
 func Disconnect(c *gin.Context) {
+	if command.Opts.LockSession {
+		c.JSON(400, Error{"Session is locked"})
+		return
+	}
+
 	conn := DB(c)
 
 	if conn == nil {
@@ -261,7 +271,10 @@ func GetConnectionInfo(c *gin.Context) {
 		return
 	}
 
-	c.JSON(200, res.Format()[0])
+	info := res.Format()[0]
+	info["session_lock"] = command.Opts.LockSession
+
+	c.JSON(200, info)
 }
 
 func GetActivity(c *gin.Context) {

pkg/command/options.go

@@ -1,6 +1,7 @@
 package command
 
 import (
+	"fmt"
 	"os"
 	"strings"
 
@@ -8,23 +9,24 @@ import (
 )
 
 type Options struct {
-	Version  bool   `short:"v" long:"version" description:"Print version"`
-	Debug    bool   `short:"d" long:"debug" description:"Enable debugging mode" default:"false"`
-	Url      string `long:"url" description:"Database connection string"`
-	Host     string `long:"host" description:"Server hostname or IP"`
-	Port     int    `long:"port" description:"Server port" default:"5432"`
-	User     string `long:"user" description:"Database user"`
-	Pass     string `long:"pass" description:"Password for user"`
-	DbName   string `long:"db" description:"Database name"`
-	Ssl      string `long:"ssl" description:"SSL option"`
-	HttpHost string `long:"bind" description:"HTTP server host" default:"localhost"`
-	HttpPort uint   `long:"listen" description:"HTTP server listen port" default:"8081"`
-	AuthUser string `long:"auth-user" description:"HTTP basic auth user"`
-	AuthPass string `long:"auth-pass" description:"HTTP basic auth password"`
-	SkipOpen bool   `short:"s" long:"skip-open" description:"Skip browser open on start"`
-	Sessions bool   `long:"sessions" description:"Enable multiple database sessions" default:"false"`
-	Prefix   string `long:"prefix" description:"Add a url prefix"`
-	ReadOnly bool   `long:"readonly" description:"Run database connection in readonly mode"`
+	Version     bool   `short:"v" long:"version" description:"Print version"`
+	Debug       bool   `short:"d" long:"debug" description:"Enable debugging mode" default:"false"`
+	Url         string `long:"url" description:"Database connection string"`
+	Host        string `long:"host" description:"Server hostname or IP"`
+	Port        int    `long:"port" description:"Server port" default:"5432"`
+	User        string `long:"user" description:"Database user"`
+	Pass        string `long:"pass" description:"Password for user"`
+	DbName      string `long:"db" description:"Database name"`
+	Ssl         string `long:"ssl" description:"SSL option"`
+	HttpHost    string `long:"bind" description:"HTTP server host" default:"localhost"`
+	HttpPort    uint   `long:"listen" description:"HTTP server listen port" default:"8081"`
+	AuthUser    string `long:"auth-user" description:"HTTP basic auth user"`
+	AuthPass    string `long:"auth-pass" description:"HTTP basic auth password"`
+	SkipOpen    bool   `short:"s" long:"skip-open" description:"Skip browser open on start"`
+	Sessions    bool   `long:"sessions" description:"Enable multiple database sessions" default:"false"`
+	Prefix      string `long:"prefix" description:"Add a url prefix"`
+	ReadOnly    bool   `long:"readonly" description:"Run database connection in readonly mode"`
+	LockSession bool   `long:"lock-session" description:"Lock session to a single database connection" default:"false"`
 }
 
 var Opts Options
@@ -43,6 +45,16 @@ func ParseOptions() error {
 		Opts.Sessions = true
 	}
 
+	if os.Getenv("LOCK_SESSION") != "" {
+		Opts.LockSession = true
+		Opts.Sessions = false
+	}
+
+	// When session is locked, connection UI is not displayed.
+	if Opts.LockSession && Opts.Url == "" {
+		return fmt.Errorf("Please provide connection url")
+	}
+
 	if Opts.Prefix != "" && !strings.Contains(Opts.Prefix, "/") {
 		Opts.Prefix = Opts.Prefix + "/"
 	}

static/css/app.css

@@ -475,6 +475,7 @@
   position: fixed;
   right: 8px;
   top: 10px;
+  display: none;
 }
 
 #edit_connection, #close_connection {

static/js/app.js

@@ -1080,6 +1080,10 @@ $(document).ready(function() {
 
       $("#current_database").text(resp.current_database);
       $("#main").show();
+
+      if (!resp.session_lock) {
+        $(".connection-actions").show();
+      }
     }
   });
 });