doc/README: changelog for v0.4.0

README.md

@@ -10,14 +10,16 @@ This is an experimental application and you should generally prefer to use [qbol
 - Connect to multiple databases
 - Browse table/bucket content
 - Run custom SQL queries
+  - Select text to run partial query
 - Safe handling for non-UTF8 key and data fields
 - Supported databases:
+  - Badger v4
   - Bolt
     - Full compatibility via the upstream [etcd-io/bbolt](https://github.com/etcd-io/bbolt) library
     - Recursive bucket support
   - SQLite
     - Uses CGo if available or modernc.org if not
-  - Badger v4
+  - Redis
 
 ## License
 
@@ -25,6 +27,8 @@ The code in this project is licensed under the ISC license (see `LICENSE` file f
 
 This project redistributes images from the famfamfam/silk icon set under the [CC-BY 2.5 license](http://creativecommons.org/licenses/by/2.5/).
 
+This project includes trademarked logo images for each supported database type.
+
 ## Usage
 
 1. `CGO_ENABLED=1 go build`
@@ -34,20 +38,32 @@ This project redistributes images from the famfamfam/silk icon set under the [CC
 
 ## Changelog
 
+2024-06-23 v0.4.0
+
+- Redis: Add as supported database
+- Badger: Allow creating in-memory databases
+- App: Allow selecting partial query text to execute
+- App: Allow closing database connections from context menu
+- App: Allow scrolling large content on Properties pane
+- App: Preload recursive navigation
+- App: Automatically switch to selected database when new connection is created
+- App: Add help website link
+- App: Add database logo images
+
 2024-06-25 v0.3.0
 
-- Add support for running custom queries
-- Add BadgerDB v4 as supported database
-- Add support for CGo-free SQLite driver under cross-compilation
-- Add status bar showing currently selected DB
-- Update Bolt to v1.4.0-alpha.1
-- Fix missing icons in nav when selecting items 
-- Fix extra quotemarks when browsing string content of database
+- Badger: Add BadgerDB v4 as supported database
+- SQLite: Add support for CGo-free SQLite driver under cross-compilation
+- Bolt: Update Bolt to v1.4.0-alpha.1
+- App: Add support for running custom queries
+- App: Add status bar showing currently selected DB
+- App: Fix missing icons in nav when selecting items 
+- App: Fix extra quotemarks when browsing string content of database
 
 2024-06-08 v0.2.0
 
-- Add SQLite support (now requires CGo)
-- Add images for menu and navigation items
+- SQLite: Add SQLite support (now requires CGo)
+- App: Add images for menu and navigation items
 
 2024-06-03 v0.1.0
 

TODO

@@ -7,7 +7,6 @@
 - More DB types
 	- MySQL
 	- Postgres
-	- Redis
 	- MSSQL (recursive navigation for instances)
 - SSH tunnels
 - Special actions
@@ -18,6 +17,8 @@
 	- https://ricardoanderegg.com/posts/sqlite-remote-explorer-gui/
 	- https://github.com/litements/litexplore
 - Badger encryption key dialog
-- Badger in-memory
 - Makefile to cross-compile release binaries in docker
+- Build own liblcl binaries in docker
 - Win32 icon resource
+- Faster virtual rendering
+	- https://github.com/ying32/govcl/blob/master/samples/listviewvirtualdata/main.go

db_badger.go

@@ -12,7 +12,6 @@ import (
 
 type badgerLoadedDatabase struct {
 	displayName string
-	path        string
 	db          *badger.DB
 	nav         *vcl.TTreeNode
 
@@ -108,24 +107,41 @@ func (ld *badgerLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListVie
 	vcl.ShowMessage("Badger doesn't support querying")
 }
 
+func (ld *badgerLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
 var _ loadedDatabase = &badgerLoadedDatabase{} // interface assertion
 
 //
 
+func (f *TMainForm) badgerAddDatabaseFromMemory() {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions("").WithInMemory(true))
+}
+
 func (f *TMainForm) badgerAddDatabaseFromDirectory(path string) {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions(path))
+}
+
+func (f *TMainForm) badgerAddDatabaseFrom(opts badger.Options) {
 	// TODO load in background thread to stop blocking the UI
-	db, err := badger.Open(badger.DefaultOptions(path))
+	db, err := badger.Open(opts)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
 		return
 	}
 
 	ld := &badgerLoadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
 		db: db,
 	}
 
+	if opts.Dir == "" {
+		ld.displayName = ":memory:" // SQLite-style naming
+	} else {
+		ld.displayName = filepath.Base(opts.Dir)
+	}
+
 	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
 	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
 	ld.nav.SetImageIndex(imgDatabase)
@@ -138,6 +154,7 @@ func (f *TMainForm) badgerAddDatabaseFromDirectory(path string) {
 	ld.nav.SetData(unsafe.Pointer(navData))
 
 	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
 
 	ld.Keepalive(navData)
 }

db_bolt.go

@@ -98,6 +98,11 @@ func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView)
 	vcl.ShowMessage("Bolt doesn't support querying")
 }
 
+func (ld *boltLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
 var _ loadedDatabase = &boltLoadedDatabase{} // interface assertion
 
 //
@@ -128,6 +133,7 @@ func (f *TMainForm) boltAddDatabaseFromFile(path string) {
 	ld.nav.SetData(unsafe.Pointer(navData))
 
 	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
 
 	ld.Keepalive(navData)
 }

db_none.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"github.com/ying32/govcl/vcl"
+)
+
+type noLoadedDatabase struct{}
+
+func (n *noLoadedDatabase) DisplayName() string {
+	return "yvbolt"
+}
+
+func (n *noLoadedDatabase) DriverName() string {
+	return "No database selected"
+}
+
+func (n *noLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return nil
+}
+
+func (n *noLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+	f.propertiesBox.SetText("Open a database to get started...")
+	f.contentBox.SetEnabled(false)
+	f.contentBox.Clear()
+}
+
+func (n *noLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+}
+
+func (n *noLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	return []string{}, nil
+}
+
+func (n *noLoadedDatabase) Keepalive(ndata *navData) {
+}
+
+func (n *noLoadedDatabase) Close() {}

db_redis.go

@@ -0,0 +1,282 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"unsafe"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+)
+
+type redisLoadedDatabase struct {
+	displayName string
+	db          *redis.Client
+	nav         *vcl.TTreeNode
+
+	currentDb     int
+	maxDb         int
+	serverVersion string // populated at connection-time from INFO command
+
+	arena []*navData // keepalive
+}
+
+func (ld *redisLoadedDatabase) DisplayName() string {
+	return ld.displayName
+}
+
+func (ld *redisLoadedDatabase) DriverName() string {
+	return "Redis " + ld.serverVersion
+}
+
+func (ld *redisLoadedDatabase) RootElement() *vcl.TTreeNode {
+	return ld.nav
+}
+
+func (ld *redisLoadedDatabase) Keepalive(ndata *navData) {
+	ld.arena = append(ld.arena, ndata)
+}
+
+func (ld *redisLoadedDatabase) RenderForNav(f *TMainForm, ndata *navData) {
+	ctx := context.Background()
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level: Show info() on main Properties tab
+		infostr, err := ld.db.Info(ctx).Result()
+		if err != nil {
+			vcl.ShowMessage(fmt.Sprintf("Retreiving database info: %v", err))
+			return
+		}
+
+		f.propertiesBox.SetText(infostr)
+
+		// Disable data tab
+		f.contentBox.SetEnabled(false)
+		f.contentBox.Clear()
+
+	} else if len(ndata.bucketPath) == 1 {
+		// One selected database
+		// Figure out its content
+		err := ld.db.Do(ctx, "SELECT", ndata.bucketPath[0]).Err()
+		if err != nil {
+			vcl.ShowMessage(fmt.Sprintf("Switching to database %q: %v", ndata.bucketPath[0], err))
+			return
+		}
+
+		allKeys, err := ld.db.Keys(ctx, "*").Result()
+		if err != nil {
+			vcl.ShowMessage(fmt.Sprintf("Listing keys in database %q: %v", ndata.bucketPath[0], err))
+			return
+		}
+
+		f.propertiesBox.SetText(fmt.Sprintf("Database %s\nTotal keys: %d\n", ndata.bucketPath[0], len(allKeys)))
+
+		// Redis always uses Key + Value as the columns
+
+		f.contentBox.SetEnabled(false)
+		f.contentBox.Clear()
+
+		f.contentBox.Columns().Clear()
+		colKey := f.contentBox.Columns().Add()
+		colKey.SetCaption("Key")
+		colKey.SetWidth(MY_WIDTH)
+		colKey.SetAlignment(types.TaLeftJustify)
+		colType := f.contentBox.Columns().Add()
+		colType.SetCaption("Type")
+		colVal := f.contentBox.Columns().Add()
+		colVal.SetCaption("Value")
+
+		for _, key := range allKeys {
+			typeName, err := ld.db.Type(ctx, key).Result()
+			if err != nil {
+				vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+				return
+			}
+
+			dataEntry := f.contentBox.Items().Add()
+			dataEntry.SetCaption(key) // formatUtf8
+			dataEntry.SubItems().Add(typeName)
+
+			switch typeName {
+			case "string":
+				val, err := ld.db.Get(ctx, key).Result()
+				if err != nil {
+					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+					return
+				}
+				dataEntry.SubItems().Add(val)
+
+			case "hash":
+				val, err := ld.db.HGetAll(ctx, key).Result()
+				if err != nil {
+					vcl.ShowMessage(fmt.Sprintf("Loading %q/%q: %v", ndata.bucketPath[0], key, err))
+					return
+				}
+				// It's a map[string]string
+				dataEntry.SubItems().Add(formatAny(val))
+
+			case "lists":
+				fallthrough
+			case "sets":
+				fallthrough
+			case "sorted sets":
+				fallthrough
+			case "stream":
+				fallthrough
+
+			default:
+				dataEntry.SubItems().Add("<<<other object type>>>")
+			}
+
+		}
+
+		// Valid
+		f.contentBox.SetEnabled(true)
+
+	} else {
+		vcl.ShowMessage(fmt.Sprintf("Unexpected nav position %q", ndata.bucketPath))
+		return
+
+	}
+}
+
+func (ld *redisLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
+	// ctx := context.Background()
+
+	if len(ndata.bucketPath) == 0 {
+		// Top-level: list of all child databases (usually 16x)
+		ret := make([]string, 0, ld.maxDb)
+		for i := 0; i < ld.maxDb; i++ {
+			ret = append(ret, fmt.Sprintf("%d", i))
+		}
+		return ret, nil
+
+	} else if len(ndata.bucketPath) == 1 {
+		// One selected database
+		// No child keys underneath it
+		return []string{}, nil
+
+	} else {
+		return nil, fmt.Errorf("Unexpected nav position %q", ndata.bucketPath)
+
+	}
+}
+
+func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
+	ctx := context.Background()
+
+	// Need to parse the query into separate string+args fields for the protocol
+	// TODO This needs to better handle quotes, escaping, ...
+	fields := strings.Fields(query)
+
+	fields_boxed := box_interface(fields)
+
+	ret, err := ld.db.Do(ctx, fields_boxed...).Result()
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("The redis query returned an error: %v", err))
+		return
+	}
+
+	resultArea.SetEnabled(false)
+	resultArea.Clear()
+
+	resultArea.Columns().Clear()
+	colVal := resultArea.Columns().Add()
+	colVal.SetCaption("Result")
+
+	// The result is probably a single value or a string slice
+	switch ret := ret.(type) {
+	case []string:
+		// Multiple values
+		for _, single := range ret {
+			cell := resultArea.Items().Add()
+			cell.SetCaption(single) // formatUtf8
+		}
+
+	default:
+		// Single value
+		dataEntry := resultArea.Items().Add()
+		dataEntry.SetCaption(formatAny(ret)) // formatUtf8
+
+	}
+
+	resultArea.SetEnabled(true)
+}
+
+func (ld *redisLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
+var _ loadedDatabase = &redisLoadedDatabase{} // interface assertion
+
+//
+
+func (f *TMainForm) redisConnect(opts *redis.Options) {
+	// TODO load in background thread to stop blocking the UI
+	ctx := context.Background()
+
+	ld := &redisLoadedDatabase{
+		displayName:   opts.Addr,
+		currentDb:     0,
+		maxDb:         1,
+		serverVersion: "<unknown>",
+	}
+
+	// Patch in a hook to remember current DB after keepalive reconnection
+	opts.DB = 0 // Default
+	opts.OnConnect = func(ctx context.Context, cn *redis.Conn) error {
+		return cn.Select(ctx, ld.currentDb).Err()
+	}
+
+	// NewClient doesn't necessarily connect, so it can't throw an err
+	ld.db = redis.NewClient(opts)
+
+	// Make an INFO request (mandatory)
+	info, err := ld.db.InfoMap(ctx).Result()
+	if err != nil {
+		vcl.ShowMessage(fmt.Sprintf("Failed to connect to Redis server: During INFO: %v", err))
+		return
+	}
+
+	if serverInfo, ok := info["Server"]; ok {
+		if v, ok := serverInfo["redis_version"]; ok {
+			ld.serverVersion = v
+		}
+	}
+
+	// List available databases (usually 1..16) with "0" as default
+	// If this fails, probably the target redis does not support multiple databases
+	// (e.g. Redis Cluster). Assume max=0.
+	if maxDatabases, err := ld.db.ConfigGet(ctx, "databases").Result(); err == nil {
+		// Got a result. Must parse it
+		m, err := strconv.ParseInt(maxDatabases["databases"], 10, 64)
+		if err != nil {
+			vcl.ShowMessage(fmt.Sprintf("Failed to connect to Redis server: During CONFIG GET databases: %v", err))
+			return
+		}
+
+		ld.maxDb = int(m)
+	}
+
+	// Done with setup
+
+	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
+	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
+	ld.nav.SetImageIndex(imgDatabase)
+	ld.nav.SetSelectedIndex(imgDatabase)
+	navData := &navData{
+		ld:             ld,
+		childrenLoaded: false,      // will be loaded dynamically
+		bucketPath:     []string{}, // empty = root
+	}
+	ld.nav.SetData(unsafe.Pointer(navData))
+
+	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
+
+	ld.Keepalive(navData)
+}

db_sqlite.go

@@ -230,6 +230,11 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
 }
 
+func (ld *sqliteLoadedDatabase) Close() {
+	_ = ld.db.Close()
+	ld.arena = nil
+}
+
 var _ loadedDatabase = &sqliteLoadedDatabase{} // interface assertion
 
 //
@@ -261,6 +266,7 @@ func (f *TMainForm) sqliteAddDatabaseFromFile(path string) {
 	ld.nav.SetData(unsafe.Pointer(navData))
 
 	f.dbs = append(f.dbs, ld)
+	f.Buckets.SetSelected(ld.nav) // Select new element
 
 	ld.Keepalive(navData)
 }

go.mod

@@ -13,6 +13,7 @@ require (
 require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/dgraph-io/ristretto v0.1.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/glog v1.0.0 // indirect
@@ -24,7 +25,9 @@ require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/klauspost/compress v1.12.3 // indirect
 	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/redis/go-redis/v9 v9.5.3 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	go.opencensus.io v0.22.5 // indirect
 	golang.org/x/mod v0.3.0 // indirect

go.sum

@@ -13,6 +13,8 @@ github.com/dgraph-io/ristretto v0.1.1 h1:6CWw5tJNgpegArSHpNHJKldNeq03FQCwYvfMVWa
 github.com/dgraph-io/ristretto v0.1.1/go.mod h1:S1GPSBCYCIhmVNfcth17y2zZtQT6wzkzgwUve0VDWWA=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 h1:tdlZCpZ/P9DhczCTSixgIKmwPv6+wP5DGjqLYw5SUiA=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
@@ -49,10 +51,14 @@ github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peK
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
 github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 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/redis/go-redis/v9 v9.5.3 h1:fOAp1/uJG+ZtcITgZOfYFmTKPE7n4Vclj1wZFgRciUU=
+github.com/redis/go-redis/v9 v9.5.3/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
@@ -102,6 +108,7 @@ golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20221010170243-090e33056c14/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
 golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

images.go

@@ -21,6 +21,11 @@ const (
 	imgTableAdd
 	imgTableDelete
 	imgTableSave
+	imgVendorDgraph
+	imgVendorGithub
+	imgVendorMySQL
+	imgVendorRedis
+	imgVendorSqlite
 )
 
 func loadImages(owner vcl.IComponent) *vcl.TImageList {
@@ -51,6 +56,11 @@ func loadImages(owner vcl.IComponent) *vcl.TImageList {
 	ilist.Add(mustLoad("assets/table_add.png"), nil)
 	ilist.Add(mustLoad("assets/table_delete.png"), nil)
 	ilist.Add(mustLoad("assets/table_save.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_dgraph.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_github.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_mysql.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_redis.png"), nil)
+	ilist.Add(mustLoad("assets/vendor_sqlite.png"), nil)
 	return ilist
 
 }

loadedDatabase.go

@@ -13,6 +13,7 @@ type loadedDatabase interface {
 	ExecQuery(query string, resultArea *vcl.TListView)
 	NavChildren(ndata *navData) ([]string, error)
 	Keepalive(ndata *navData)
+	Close()
 }
 
 // navData is the .Data() pointer for each TTreeNode in the left-hand tree.

main.go

@@ -5,15 +5,10 @@ import (
 	"strings"
 	"unsafe"
 
-	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
+	"github.com/pkg/browser"
 	"github.com/ying32/govcl/vcl"
 	"github.com/ying32/govcl/vcl/types"
-)
-
-const (
-	MY_SPACING = 6
-	MY_HEIGHT  = 90
-	MY_WIDTH   = 180
+	"github.com/ying32/govcl/vcl/types/colors"
 )
 
 type TMainForm struct {
@@ -29,6 +24,7 @@ type TMainForm struct {
 	queryInput    *vcl.TMemo
 	queryResult   *vcl.TListView
 
+	none *noLoadedDatabase
 	dbs  []loadedDatabase
 }
 
@@ -44,35 +40,76 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.ImageList = loadImages(f)
 
 	f.SetCaption("yvbolt")
+	f.ScreenCenter()
 	f.ImageList.GetIcon(imgDatabaseLightning, f.Icon())
 
 	mnuFile := vcl.NewMenuItem(f)
 	mnuFile.SetCaption("File")
 
-	mnuFileOpen := vcl.NewMenuItem(mnuFile)
-	mnuFileOpen.SetCaption("Open Bolt database...")
-	mnuFileOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileOpen.SetShortCutFromString("Ctrl+O")
-	mnuFileOpen.SetOnClick(f.OnMnuFileOpenClick)
-	mnuFile.Add(mnuFileOpen)
+	mnuFileBadger := vcl.NewMenuItem(mnuFile)
+	mnuFileBadger.SetCaption("Badger")
+	mnuFileBadger.SetImageIndex(imgVendorDgraph)
+	mnuFile.Add(mnuFileBadger)
 
-	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFile)
-	mnuFileSqliteOpen.SetCaption("Open SQLite database...")
-	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
-	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
-	mnuFile.Add(mnuFileSqliteOpen)
-
-	mnuFileBadgerOpen := vcl.NewMenuItem(mnuFile)
-	mnuFileBadgerOpen.SetCaption("Open Badger v4 database...")
+	mnuFileBadgerOpen := vcl.NewMenuItem(mnuFileBadger)
+	mnuFileBadgerOpen.SetCaption("Open database...")
 	mnuFileBadgerOpen.SetImageIndex(imgDatabaseAdd)
 	mnuFileBadgerOpen.SetOnClick(f.OnMnuFileBadgerOpenClick)
-	mnuFile.Add(mnuFileBadgerOpen)
+	mnuFileBadger.Add(mnuFileBadgerOpen)
 
-	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFile)
-	mnuFileSqliteMemory.SetCaption("New SQLite in-memory database")
+	mnuFileBadgerMemory := vcl.NewMenuItem(mnuFileBadger)
+	mnuFileBadgerMemory.SetCaption("New in-memory database")
+	mnuFileBadgerMemory.SetImageIndex(imgDatabaseAdd)
+	mnuFileBadgerMemory.SetOnClick(f.OnMnuFileBadgerMemoryClick)
+	mnuFileBadger.Add(mnuFileBadgerMemory)
+
+	//
+
+	mnuFileBolt := vcl.NewMenuItem(mnuFile)
+	mnuFileBolt.SetCaption("Bolt")
+	mnuFileBolt.SetImageIndex(imgVendorGithub)
+	mnuFile.Add(mnuFileBolt)
+
+	mnuFileBoltOpen := vcl.NewMenuItem(mnuFileBolt)
+	mnuFileBoltOpen.SetCaption("Open database...")
+	mnuFileBoltOpen.SetImageIndex(imgDatabaseAdd)
+	mnuFileBoltOpen.SetShortCutFromString("Ctrl+O")
+	mnuFileBoltOpen.SetOnClick(f.OnMnuFileOpenClick)
+	mnuFileBolt.Add(mnuFileBoltOpen)
+
+	//
+
+	mnuFileRedis := vcl.NewMenuItem(mnuFile)
+	mnuFileRedis.SetCaption("Redis")
+	mnuFileRedis.SetImageIndex(imgVendorRedis)
+	mnuFile.Add(mnuFileRedis)
+
+	mnuFileRedisConnect := vcl.NewMenuItem(mnuFileRedis)
+	mnuFileRedisConnect.SetCaption("Connect...")
+	mnuFileRedisConnect.SetImageIndex(imgDatabaseAdd)
+	mnuFileRedisConnect.SetOnClick(f.OnMnuFileRedisConnectClick)
+	mnuFileRedis.Add(mnuFileRedisConnect)
+
+	//
+
+	mnuFileSqlite := vcl.NewMenuItem(mnuFile)
+	mnuFileSqlite.SetCaption("SQLite")
+	mnuFileSqlite.SetImageIndex(imgVendorSqlite)
+	mnuFile.Add(mnuFileSqlite)
+
+	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFileSqlite)
+	mnuFileSqliteOpen.SetCaption("Open database...")
+	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
+	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
+	mnuFileSqlite.Add(mnuFileSqliteOpen)
+
+	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFileSqlite)
+	mnuFileSqliteMemory.SetCaption("New in-memory database")
 	mnuFileSqliteMemory.SetImageIndex(imgDatabaseAdd)
 	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
-	mnuFile.Add(mnuFileSqliteMemory)
+	mnuFileSqlite.Add(mnuFileSqliteMemory)
+
+	//
 
 	mnuSep := vcl.NewMenuItem(mnuFile)
 	mnuSep.SetCaption("-") // Creates separator
@@ -93,10 +130,20 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuQueryExecute.SetImageIndex(imgLightning)
 	mnuQuery.Add(mnuQueryExecute)
 
+	mnuHelp := vcl.NewMenuItem(f)
+	mnuHelp.SetCaption("Help")
+
+	mnuHelpHomepage := vcl.NewMenuItem(mnuHelp)
+	mnuHelpHomepage.SetCaption("About yvbolt")
+	mnuHelpHomepage.SetShortCutFromString("F1")
+	mnuHelpHomepage.SetOnClick(f.OnMnuHelpHomepage)
+	mnuHelp.Add(mnuHelpHomepage)
+
 	f.Menu = vcl.NewMainMenu(f)
 	f.Menu.SetImages(f.ImageList)
 	f.Menu.Items().Add(mnuFile)
 	f.Menu.Items().Add(mnuQuery)
+	f.Menu.Items().Add(mnuHelp)
 
 	//
 
@@ -114,6 +161,7 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.Buckets.SetReadOnly(true) // prevent click to rename on nodes
 	f.Buckets.SetOnExpanding(f.OnNavExpanding)
 	f.Buckets.SetOnChange(f.OnNavChange)
+	f.Buckets.SetOnContextPopup(f.OnNavContextPopup)
 
 	hsplit := vcl.NewSplitter(f)
 	hsplit.SetParent(f)
@@ -135,9 +183,11 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.propertiesBox.BorderSpacing().SetAround(MY_SPACING)
 	f.propertiesBox.SetAlign(types.AlClient) // fill remaining space
 	f.propertiesBox.SetReadOnly(true)
-	f.propertiesBox.SetEnabled(false)
+	f.propertiesBox.SetEnabled(true)        // Need to leave it enabled so scrolling works
+	f.propertiesBox.SetColor(colors.ClForm) // 0x00f0f0f0
+
 	f.propertiesBox.SetBorderStyle(types.BsNone)
-	f.propertiesBox.SetText("Open a database to get started...")
+	f.propertiesBox.SetScrollBars(types.SsAutoVertical)
 
 	dataTab := vcl.NewTabSheet(f.Tabs)
 	dataTab.SetParent(f.Tabs)
@@ -199,6 +249,9 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	f.queryResult.BorderSpacing().SetLeft(MY_SPACING)
 	f.queryResult.BorderSpacing().SetRight(MY_SPACING)
 	f.queryResult.BorderSpacing().SetBottom(MY_SPACING)
+
+	f.none = &noLoadedDatabase{}
+	f.OnNavChange(f, nil) // calls f.none.RenderForNav and sets up status bar content
 }
 
 func (f *TMainForm) OnMnuFileOpenClick(sender vcl.IObject) {
@@ -230,14 +283,101 @@ func (f *TMainForm) OnMnuFileBadgerOpenClick(sender vcl.IObject) {
 	}
 }
 
+func (f *TMainForm) OnMnuFileBadgerMemoryClick(sender vcl.IObject) {
+	f.badgerAddDatabaseFromMemory()
+
+}
+
 func (f *TMainForm) OnMnuFileSqliteMemoryClick(sender vcl.IObject) {
 	f.sqliteAddDatabaseFromFile(`:memory:`)
 }
 
+func (f *TMainForm) OnMnuFileRedisConnectClick(sender vcl.IObject) {
+
+	var child *TRedisConnectionDialog
+	vcl.Application.CreateForm(&child)
+	defer child.Free()
+
+	var ret TRedisConnectionDialogResult
+	child.CustomReturn = &ret
+
+	mr := child.ShowModal() // Fake blocking
+	if mr != types.MrOk || ret == nil {
+		return // Cancelled
+	}
+
+	// Connect
+	f.redisConnect(ret)
+}
+
 func (f *TMainForm) OnMnuFileExitClick(sender vcl.IObject) {
 	f.Close()
 }
 
+func (f *TMainForm) OnMnuHelpHomepage(sender vcl.IObject) {
+	err := browser.OpenURL("https://code.ivysaur.me/yvbolt")
+	if err != nil {
+		vcl.ShowMessage("Opening browser: " + err.Error())
+	}
+}
+
+func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint, handled *bool) {
+	*handled = true
+
+	curItem := f.Buckets.Selected()
+	if curItem == nil {
+		// Nothing is selected at all
+		return
+	}
+
+	mnu := vcl.NewPopupMenu(f.Buckets)
+
+	mnuRefresh := vcl.NewMenuItem(mnu)
+	mnuRefresh.SetCaption("Refresh")
+	mnuRefresh.SetOnClick(f.OnNavContextRefresh)
+	mnu.Items().Add(mnuRefresh)
+
+	// Check what custom actions the ndata->db itself wants to add
+	// ...
+
+	if curItem.Parent() == nil {
+		// Top-level item (database connection). Allow closing by right-click.
+		mnuSep := vcl.NewMenuItem(mnu)
+		mnuSep.SetCaption("-")
+		mnu.Items().Add(mnuSep)
+
+		mnuClose := vcl.NewMenuItem(mnu)
+		mnuClose.SetCaption("Close")
+		mnuClose.SetOnClick(f.OnNavContextClose)
+		mnu.Items().Add(mnuClose)
+	}
+
+	// Show popup
+	mnu.Popup2()
+}
+
+func (f *TMainForm) OnNavContextRefresh(sender vcl.IObject) {
+	vcl.ShowMessage("TODO")
+	// TODO
+}
+
+func (f *TMainForm) OnNavContextClose(sender vcl.IObject) {
+	curItem := f.Buckets.Selected()
+	if curItem == nil {
+		return // Nothing selected (shouldn't happen)
+	}
+	if curItem.Parent() != nil {
+		return // Selection is not top-level DB connection (shouldn't happen)
+	}
+
+	ndata := (*navData)(curItem.Data())
+
+	ndata.ld.Close()
+	curItem.Delete()
+
+	// n.b. This triggers OnNavChange, which will then re-render from noLoadedDatabase{}
+}
+
 func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	// If query tab is not selected, switch to it, but do not exec
 	if f.Tabs.ActivePageIndex() != 2 {
@@ -245,6 +385,11 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 		return
 	}
 
+	queryString := f.queryInput.Text()
+	if f.queryInput.SelLength() > 0 {
+		queryString = f.queryInput.SelText() // Just the selected text
+	}
+
 	// Execute
 	node := f.Buckets.Selected()
 	if node == nil {
@@ -253,22 +398,23 @@ func (f *TMainForm) OnQueryExecute(sender vcl.IObject) {
 	}
 
 	ndata := (*navData)(node.Data())
-	ndata.ld.ExecQuery(f.queryInput.Text(), f.queryResult)
+	ndata.ld.ExecQuery(queryString, f.queryResult)
 }
 
 func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {
 
-	if node.Data() == nil {
-		vcl.ShowMessage("unexpected nil data")
-		return
+	var ld loadedDatabase = f.none
+	var ndata *navData = nil
+
+	if node != nil && node.Data() != nil {
+		ndata = (*navData)(node.Data())
+		ld = ndata.ld
 	}
 
-	ndata := (*navData)(node.Data())
-
-	ndata.ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
+	ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
 
 	// We're in charge of common status bar text updates
-	f.StatusBar.SetSimpleText(ndata.ld.DisplayName() + " | " + ndata.ld.DriverName())
+	f.StatusBar.SetSimpleText(ld.DisplayName() + " | " + ld.DriverName())
 }
 
 func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allowExpansion *bool) {
@@ -281,25 +427,58 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 
 	ndata := (*navData)(node.Data())
 
-	if ndata.childrenLoaded {
+	err := f.NavLoadChildren(node, ndata)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+		*allowExpansion = false // Permanently block
 		return
 	}
 
+	*allowExpansion = node.HasChildren()
+
+	// While we're here - preload one single level deep (not any deeper)
+
+	if node.HasChildren() {
+
+		// This node has children that we haven't processed. Process them now
+		cc := node.GetFirstChild()
+
+		for {
+			ndataChild := (*navData)(cc.Data())
+			if ndataChild.childrenLoaded {
+				break // We always do them together, so if one's done, no need to keep looking
+			}
+
+			f.NavLoadChildren(cc, ndataChild)
+
+			cc = cc.GetNextSibling()
+			if cc == nil {
+				break
+			}
+		}
+
+	}
+}
+
+func (f *TMainForm) NavLoadChildren(node *vcl.TTreeNode, ndata *navData) error {
+
+	if ndata.childrenLoaded {
+		return nil // Nothing to do
+	}
+
 	// Find the child buckets from this point under the element
 	nextBucketNames, err := ndata.ld.NavChildren(ndata)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to find child buckets under %q: %s", strings.Join(ndata.bucketPath, `/`), err.Error()))
-		*allowExpansion = false
-		return
+		return fmt.Errorf("Failed to find child buckets under %q: %w", strings.Join(ndata.bucketPath, `/`), err)
 	}
 
 	ndata.childrenLoaded = true // don't repeat this work
 
 	if len(nextBucketNames) == 0 {
 		node.SetHasChildren(false)
-		*allowExpansion = false
 
 	} else {
+		node.SetHasChildren(true)
 
 		// Populate LCL child nodes
 		for _, bucketName := range nextBucketNames {
@@ -319,7 +498,7 @@ func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allo
 
 			ndata.ld.Keepalive(navData)
 		}
-
-		*allowExpansion = true
 	}
+
+	return nil
 }

platform_windows.go

@@ -0,0 +1,5 @@
+package main
+
+import (
+	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
+)

redisConnectionDialog.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+)
+
+type TRedisConnectionDialogResult = *redis.Options
+
+type TRedisConnectionDialog struct {
+	*vcl.TForm
+
+	Address         *vcl.TEdit
+	Port            *vcl.TSpinEdit
+	Password        *vcl.TEdit
+	IsResp3Protocol *vcl.TCheckBox
+	ConnectBtn      *vcl.TButton
+
+	// CustomReturn must be set by the caller to a *redis.Options variable.
+	CustomReturn *TRedisConnectionDialogResult // nil = no CustomReturn/cancelled dialog
+}
+
+func (f *TRedisConnectionDialog) OnFormCreate(sender vcl.IObject) {
+
+	f.SetCaption("Connect to Redis...")
+	f.ScreenCenter()
+	f.SetWidth(320)
+	f.SetHeight(160)
+
+	// row 1
+
+	row1 := vcl_row(f, 1)
+
+	lblAddress := vcl.NewLabel(row1)
+	lblAddress.SetParent(row1)
+	lblAddress.SetCaption("Address:")
+	lblAddress.SetAlign(types.AlLeft)
+	lblAddress.SetLayout(types.TlCenter)
+	lblAddress.SetLeft(1)
+	lblAddress.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Address = vcl.NewEdit(row1)
+	f.Address.SetParent(row1)
+	f.Address.SetAlign(types.AlClient) // grow AlLeft)
+	f.Address.SetWidth(MY_WIDTH)
+	f.Address.SetLeft(2)
+	f.Address.SetText("127.0.0.1")
+	f.Address.BorderSpacing().SetAround(MY_SPACING)
+
+	lblPort := vcl.NewLabel(row1)
+	lblPort.SetParent(row1)
+	lblPort.SetCaption(":")
+	lblPort.SetAlign(types.AlRight)
+	lblPort.SetLayout(types.TlCenter)
+	lblPort.SetLeft(0)
+	lblPort.SetAutoSize(true)
+	lblPort.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Port = vcl.NewSpinEdit(row1)
+	f.Port.SetParent(row1)
+	f.Port.SetMinValue(1)
+	f.Port.SetMaxValue(65535)
+	f.Port.SetValue(6379) // Redis default port
+	f.Port.SetAlign(types.AlRight)
+	f.Port.SetLeft(1000)
+	f.Port.BorderSpacing().SetAround(MY_SPACING)
+
+	// row 2
+
+	row2 := vcl_row(f, 2)
+
+	lblPassword := vcl.NewLabel(row2)
+	lblPassword.SetParent(row2)
+	lblPassword.SetCaption("Password:")
+	lblPassword.SetAlign(types.AlLeft)
+	lblPassword.SetLayout(types.TlCenter)
+	lblPassword.SetLeft(1)
+	lblPassword.BorderSpacing().SetAround(MY_SPACING)
+
+	f.Password = vcl.NewEdit(row2)
+	f.Password.SetParent(row2)
+	f.Password.SetAlign(types.AlClient) // grow
+	f.Password.SetLeft(2)
+	f.Password.SetWidth(MY_WIDTH)
+	f.Password.SetPasswordChar(uint16('*'))
+	f.Password.BorderSpacing().SetAround(MY_SPACING)
+
+	// row 3
+
+	f.IsResp3Protocol = vcl.NewCheckBox(f)
+	f.IsResp3Protocol.SetParent(f)
+	f.IsResp3Protocol.SetCaption("Use RESP v3 protocol")
+	f.IsResp3Protocol.SetChecked(true)
+	f.IsResp3Protocol.SetAlign(types.AlTop)
+	f.IsResp3Protocol.SetTop(3)
+	f.IsResp3Protocol.BorderSpacing().SetAround(MY_SPACING)
+
+	// buttons
+
+	row4 := vcl_row(f, 4)
+	row4.SetAlign(types.AlBottom)
+
+	f.ConnectBtn = vcl.NewButton(row4)
+	f.ConnectBtn.SetParent(row4)
+	f.ConnectBtn.SetAlign(types.AlRight)
+	f.ConnectBtn.SetCaption("Connect")
+	f.ConnectBtn.SetOnClick(f.OnConnectBtnClick)
+}
+
+func (f *TRedisConnectionDialog) OnConnectBtnClick(sender vcl.IObject) {
+
+	ret := &redis.Options{
+		Addr:     fmt.Sprintf("%s:%d", f.Address.Text(), f.Port.Value()),
+		Password: f.Password.Text(),
+		DB:       0, // Start off with default DB, but, we will browse them ourselves
+		Protocol: 2, // RESP2
+	}
+
+	if f.IsResp3Protocol.Checked() {
+		ret.Protocol = 3 // RESP3
+	}
+
+	// Success.
+	// Fill in target pointer and close dialog with "MrOk" sentinel
+	*f.CustomReturn = ret
+	f.SetModalResult(types.MrOk)
+}

util_types.go

@@ -0,0 +1,11 @@
+package main
+
+// box_interface creates a slice where all elements of the input slice are boxed
+// in an interface{} type.
+func box_interface[T any](input []T) []interface{} {
+	ret := make([]interface{}, 0, len(input))
+	for _, v := range input {
+		ret = append(ret, v)
+	}
+	return ret
+}

util_vcl.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"github.com/ying32/govcl/vcl"
+	"github.com/ying32/govcl/vcl/types"
+)
+
+const (
+	MY_SPACING = 6
+	MY_HEIGHT  = 90
+	MY_WIDTH   = 180
+)
+
+// vcl_row makes a TPanel row inside the target component.
+func vcl_row(owner vcl.IWinControl, top int32) *vcl.TPanel {
+
+	r := vcl.NewPanel(owner)
+	r.SetParent(owner)
+	r.SetBorderStyle(types.BsNone)
+	r.SetBevelInner(types.BvNone)
+	r.SetBevelOuter(types.BvNone)
+	r.SetAlign(types.AlTop)
+	r.SetTop(top)
+	r.SetAutoSize(true)
+
+	return r
+}