Merge pull request #11 from wavetermdev/sawka/use-blockstore

use blockstore, save/restore terminal state output (tab switching or app restart)

frontend/app/view/term.tsx

@@ -40,14 +40,21 @@ function getThemeFromCSSVars(el: Element): ITheme {
     return theme;
 }
 
+type InitialLoadDataType = {
+    loaded: boolean;
+    heldData: Uint8Array[];
+};
+
 const TerminalView = ({ blockId }: { blockId: string }) => {
     const connectElemRef = React.useRef<HTMLDivElement>(null);
     const termRef = React.useRef<Terminal>(null);
+    const initialLoadRef = React.useRef<InitialLoadDataType>({ loaded: false, heldData: [] });
 
     React.useEffect(() => {
         if (!connectElemRef.current) {
             return;
         }
+        console.log("terminal created");
         const term = new Terminal({
             theme: getThemeFromCSSVars(connectElemRef.current),
             fontSize: 12,
@@ -89,7 +96,11 @@ const TerminalView = ({ blockId }: { blockId: string }) => {
         blockSubject.subscribe((data) => {
             // base64 decode
             const decodedData = base64ToArray(data.ptydata);
+            if (initialLoadRef.current.loaded) {
                 term.write(decodedData);
+            } else {
+                initialLoadRef.current.heldData.push(decodedData);
+            }
         });
 
         return () => {
@@ -99,6 +110,39 @@ const TerminalView = ({ blockId }: { blockId: string }) => {
         };
     }, [connectElemRef.current]);
 
+    React.useEffect(() => {
+        if (!termRef.current) {
+            return;
+        }
+        // load data from blockfile
+        const startTs = Date.now();
+        let loadedBytes = 0;
+        const localTerm = termRef.current; // avoids devmode double effect running issue (terminal gets created twice)
+        const usp = new URLSearchParams();
+        usp.set("blockid", blockId);
+        usp.set("name", "main");
+        fetch("/wave/blockfile?" + usp.toString())
+            .then((resp) => {
+                if (resp.ok) {
+                    return resp.arrayBuffer();
+                }
+                console.log("error loading blockfile", resp.status, resp.statusText);
+            })
+            .then((data: ArrayBuffer) => {
+                const uint8View = new Uint8Array(data);
+                localTerm.write(uint8View);
+                loadedBytes = uint8View.byteLength;
+            })
+            .finally(() => {
+                initialLoadRef.current.heldData.forEach((data) => {
+                    localTerm.write(data);
+                });
+                initialLoadRef.current.loaded = true;
+                initialLoadRef.current.heldData = [];
+                console.log(`terminal loaded blockfile ${loadedBytes} bytes, ${Date.now() - startTs}ms`);
+            });
+    }, [termRef.current]);
+
     return (
         <div className="view-term">
             <div key="conntectElem" className="term-connectelem" ref={connectElemRef}></div>

main.go

@@ -8,13 +8,20 @@ package main
 import (
 	"context"
 	"embed"
+	"encoding/base64"
+	"encoding/json"
 	"fmt"
+	"io/fs"
 	"log"
 	"net/http"
+	"os"
+	"os/signal"
 	"runtime"
 	"strings"
+	"syscall"
 	"time"
 
+	"github.com/google/uuid"
 	"github.com/wavetermdev/thenextwave/pkg/blockstore"
 	"github.com/wavetermdev/thenextwave/pkg/eventbus"
 	"github.com/wavetermdev/thenextwave/pkg/service/blockservice"
@@ -77,19 +84,80 @@ func createWindow(windowData *wstore.Window, app *application.App) {
 		eventbus.UnregisterWailsWindow(window.ID())
 	})
 	window.Show()
+	go func() {
+		time.Sleep(100 * time.Millisecond)
+		objectService := &objectservice.ObjectService{}
+		uiContext := wstore.UIContext{
+			WindowId:    windowData.OID,
+			ActiveTabId: windowData.ActiveTabId,
+		}
+		_, err := objectService.SetActiveTab(uiContext, windowData.ActiveTabId)
+		if err != nil {
+			log.Printf("error setting active tab for new window: %v\n", err)
+		}
+	}()
 }
 
 type waveAssetHandler struct {
 	AssetHandler http.Handler
 }
 
+func serveBlockFile(w http.ResponseWriter, r *http.Request) {
+	blockId := r.URL.Query().Get("blockid")
+	name := r.URL.Query().Get("name")
+	if _, err := uuid.Parse(blockId); err != nil {
+		http.Error(w, fmt.Sprintf("invalid blockid: %v", err), http.StatusBadRequest)
+		return
+	}
+	if name == "" {
+		http.Error(w, "name is required", http.StatusBadRequest)
+		return
+
+	}
+	file, err := blockstore.GBS.Stat(r.Context(), blockId, name)
+	if err == fs.ErrNotExist {
+		http.NotFound(w, r)
+		return
+	}
+	if err != nil {
+		http.Error(w, fmt.Sprintf("error getting file info: %v", err), http.StatusInternalServerError)
+		return
+	}
+	jsonFileBArr, err := json.Marshal(file)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("error serializing file info: %v", err), http.StatusInternalServerError)
+	}
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("Content-Length", fmt.Sprintf("%d", file.Size))
+	w.Header().Set("X-BlockFileInfo", base64.StdEncoding.EncodeToString(jsonFileBArr))
+	w.Header().Set("Last-Modified", time.UnixMilli(file.ModTs).UTC().Format(http.TimeFormat))
+	for offset := file.DataStartIdx(); offset < file.Size; offset += blockstore.DefaultPartDataSize {
+		_, data, err := blockstore.GBS.ReadAt(r.Context(), blockId, name, offset, blockstore.DefaultPartDataSize)
+		if err != nil {
+			if offset == 0 {
+				http.Error(w, fmt.Sprintf("error reading file: %v", err), http.StatusInternalServerError)
+			} else {
+				// nothing to do, the headers have already been sent
+				log.Printf("error reading file %s/%s @ %d: %v\n", blockId, name, offset, err)
+			}
+			return
+		}
+		w.Write(data)
+	}
+}
+
 func serveWaveUrls(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Cache-Control", "no-cache")
 	if r.URL.Path == "/wave/stream-file" {
 		fileName := r.URL.Query().Get("path")
 		fileName = wavebase.ExpandHomeDir(fileName)
 		http.ServeFile(w, r, fileName)
 		return
 	}
+	if r.URL.Path == "/wave/blockfile" {
+		serveBlockFile(w, r)
+		return
+	}
 	http.NotFound(w, r)
 }
 
@@ -101,6 +169,27 @@ func (wah waveAssetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	wah.AssetHandler.ServeHTTP(w, r)
 }
 
+func doShutdown(reason string) {
+	log.Printf("shutting down: %s\n", reason)
+	ctx, cancelFn := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancelFn()
+	// TODO deal with flush in progress
+	blockstore.GBS.FlushCache(ctx)
+	time.Sleep(200 * time.Millisecond)
+	os.Exit(0)
+}
+
+func installShutdownSignalHandlers() {
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGTERM, syscall.SIGINT)
+	go func() {
+		for sig := range sigCh {
+			doShutdown(fmt.Sprintf("got signal %v", sig))
+			break
+		}
+	}()
+}
+
 func main() {
 	err := wavebase.EnsureWaveHomeDir()
 	if err != nil {
@@ -129,6 +218,7 @@ func main() {
 		log.Printf("error ensuring initial data: %v\n", err)
 		return
 	}
+	installShutdownSignalHandlers()
 
 	app := application.New(application.Options{
 		Name:        "NextWave",

pkg/blockcontroller/blockcontroller.go

@@ -4,6 +4,7 @@
 package blockcontroller
 
 import (
+	"bytes"
 	"context"
 	"encoding/base64"
 	"encoding/json"
@@ -15,6 +16,7 @@ import (
 
 	"github.com/creack/pty"
 	"github.com/wailsapp/wails/v3/pkg/application"
+	"github.com/wavetermdev/thenextwave/pkg/blockstore"
 	"github.com/wavetermdev/thenextwave/pkg/eventbus"
 	"github.com/wavetermdev/thenextwave/pkg/shellexec"
 	"github.com/wavetermdev/thenextwave/pkg/wstore"
@@ -86,7 +88,54 @@ func (bc *BlockController) Close() {
 	}
 }
 
+const DefaultTermMaxFileSize = 256 * 1024
+
+func (bc *BlockController) handleShellProcData(data []byte, seqNum int) error {
+	ctx, cancelFn := context.WithTimeout(context.Background(), DefaultTimeout)
+	defer cancelFn()
+	err := blockstore.GBS.AppendData(ctx, bc.BlockId, "main", data)
+	if err != nil {
+		return fmt.Errorf("error appending to blockfile: %w", err)
+	}
+	eventbus.SendEvent(application.WailsEvent{
+		Name: "block:ptydata",
+		Data: map[string]any{
+			"blockid":   bc.BlockId,
+			"blockfile": "main",
+			"ptydata":   base64.StdEncoding.EncodeToString(data),
+			"seqnum":    seqNum,
+		},
+	})
+	return nil
+}
+
+func (bc *BlockController) resetTerminalState() {
+	ctx, cancelFn := context.WithTimeout(context.Background(), DefaultTimeout)
+	defer cancelFn()
+	var buf bytes.Buffer
+	// buf.WriteString("\x1b[?1049l") // disable alternative buffer
+	buf.WriteString("\x1b[0m")     // reset attributes
+	buf.WriteString("\x1b[?25h")   // show cursor
+	buf.WriteString("\x1b[?1000l") // disable mouse tracking
+	buf.WriteString("\r\n\r\n(restored terminal state)\r\n\r\n")
+	err := blockstore.GBS.AppendData(ctx, bc.BlockId, "main", buf.Bytes())
+	if err != nil {
+		log.Printf("error appending to blockfile (terminal reset): %v\n", err)
+	}
+}
+
 func (bc *BlockController) DoRunShellCommand(rc *RunShellOpts) error {
+	// create a circular blockfile for the output
+	ctx, cancelFn := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancelFn()
+	err := blockstore.GBS.MakeFile(ctx, bc.BlockId, "main", nil, blockstore.FileOptsType{MaxSize: DefaultTermMaxFileSize, Circular: true})
+	if err != nil && err != blockstore.ErrAlreadyExists {
+		return fmt.Errorf("error creating blockfile: %w", err)
+	}
+	if err == blockstore.ErrAlreadyExists {
+		// reset the terminal state
+		bc.resetTerminalState()
+	}
 	if bc.getShellProc() != nil {
 		return nil
 	}
@@ -114,15 +163,13 @@ func (bc *BlockController) DoRunShellCommand(rc *RunShellOpts) error {
 		for {
 			nr, err := bc.ShellProc.Pty.Read(buf)
 			seqNum++
-			eventbus.SendEvent(application.WailsEvent{
-				Name: "block:ptydata",
-				Data: map[string]any{
-					"blockid":   bc.BlockId,
-					"blockfile": "main",
-					"ptydata":   base64.StdEncoding.EncodeToString(buf[:nr]),
-					"seqnum":    seqNum,
-				},
-			})
+			if nr > 0 {
+				handleDataErr := bc.handleShellProcData(buf[:nr], seqNum)
+				if handleDataErr != nil {
+					log.Printf("error handling shell data: %v\n", handleDataErr)
+					break
+				}
+			}
 			if err == io.EOF {
 				break
 			}

pkg/blockstore/blockstore.go

@@ -11,6 +11,8 @@ import (
 	"context"
 	"fmt"
 	"io/fs"
+	"log"
+	"runtime/debug"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -33,9 +35,9 @@ var GBS *BlockStore = &BlockStore{
 }
 
 type FileOptsType struct {
-	MaxSize  int64
-	Circular bool
-	IJson    bool
+	MaxSize  int64 `json:"maxsize,omitempty"`
+	Circular bool  `json:"circular,omitempty"`
+	IJson    bool  `json:"ijson,omitempty"`
 }
 
 type FileMeta = map[string]any
@@ -53,6 +55,24 @@ type BlockFile struct {
 	Meta  FileMeta `json:"meta"` // only top-level keys can be updated (lower levels are immutable)
 }
 
+// for regular files this is just Size
+// for circular files this is min(Size, MaxSize)
+func (f BlockFile) DataLength() int64 {
+	if f.Opts.Circular {
+		return minInt64(f.Size, f.Opts.MaxSize)
+	}
+	return f.Size
+}
+
+// for regular files this is just 0
+// for circular files this is the index of the first byte of data we have
+func (f BlockFile) DataStartIdx() int64 {
+	if f.Opts.Circular && f.Size > f.Opts.MaxSize {
+		return f.Size - f.Opts.MaxSize
+	}
+	return 0
+}
+
 // this works because lower levels are immutable
 func copyMeta(meta FileMeta) FileMeta {
 	newMeta := make(FileMeta)
@@ -265,28 +285,40 @@ func (s *BlockStore) ReadFile(ctx context.Context, blockId string, name string)
 	return
 }
 
-func (s *BlockStore) FlushCache(ctx context.Context) error {
+type FlushStats struct {
+	FlushDuration   time.Duration
+	NumDirtyEntries int
+	NumCommitted    int
+}
+
+func (s *BlockStore) FlushCache(ctx context.Context) (stats FlushStats, rtnErr error) {
 	wasFlushing := s.setUnlessFlushing()
 	if wasFlushing {
-		return fmt.Errorf("flush already in progress")
+		return stats, fmt.Errorf("flush already in progress")
 	}
 	defer s.setIsFlushing(false)
+	startTime := time.Now()
+	defer func() {
+		stats.FlushDuration = time.Since(startTime)
+	}()
 
 	// get a copy of dirty keys so we can iterate without the lock
 	dirtyCacheKeys := s.getDirtyCacheKeys()
+	stats.NumDirtyEntries = len(dirtyCacheKeys)
 	for _, key := range dirtyCacheKeys {
 		err := withLock(s, key.BlockId, key.Name, func(entry *CacheEntry) error {
 			return entry.flushToDB(ctx, false)
 		})
 		if ctx.Err() != nil {
 			// transient error (also must stop the loop)
-			return ctx.Err()
+			return stats, ctx.Err()
 		}
 		if err != nil {
-			return fmt.Errorf("error flushing cache entry[%v]: %v", key, err)
+			return stats, fmt.Errorf("error flushing cache entry[%v]: %v", key, err)
 		}
+		stats.NumCommitted++
 	}
-	return nil
+	return stats, nil
 }
 
 ///////////////////////////////////
@@ -367,7 +399,32 @@ func (s *BlockStore) setUnlessFlushing() bool {
 	}
 	s.IsFlushing = true
 	return false
+}
 
+func (s *BlockStore) runFlushWithNewContext() (FlushStats, error) {
+	ctx, cancelFn := context.WithTimeout(context.Background(), DefaultFlushTime)
+	defer cancelFn()
+	return s.FlushCache(ctx)
+}
+
+func (s *BlockStore) runFlusher() {
+	defer func() {
+		if r := recover(); r != nil {
+			log.Printf("panic in blockstore flusher: %v\n", r)
+			debug.PrintStack()
+		}
+	}()
+	for {
+		stats, err := s.runFlushWithNewContext()
+		if err != nil || stats.NumDirtyEntries > 0 {
+			log.Printf("blockstore flush: %d/%d entries flushed, err:%v\n", stats.NumCommitted, stats.NumDirtyEntries, err)
+		}
+		if stopFlush.Load() {
+			log.Printf("blockstore flusher stopping\n")
+			return
+		}
+		time.Sleep(DefaultFlushTime)
+	}
 }
 
 func minInt64(a, b int64) int64 {

pkg/blockstore/blockstore_dbops.go

@@ -11,10 +11,16 @@ import (
 	"github.com/wavetermdev/waveterm/wavesrv/pkg/dbutil"
 )
 
+var ErrAlreadyExists = fmt.Errorf("file already exists")
+
 func dbInsertFile(ctx context.Context, file *BlockFile) error {
 	// will fail if file already exists
 	return WithTx(ctx, func(tx *TxWrap) error {
-		query := "INSERT INTO db_block_file (blockid, name, size, createdts, modts, opts, meta) VALUES (?, ?, ?, ?, ?, ?, ?)"
+		query := "SELECT blockid FROM db_block_file WHERE blockid = ? AND name = ?"
+		if tx.Exists(query, file.BlockId, file.Name) {
+			return ErrAlreadyExists
+		}
+		query = "INSERT INTO db_block_file (blockid, name, size, createdts, modts, opts, meta) VALUES (?, ?, ?, ?, ?, ?, ?)"
 		tx.Exec(query, file.BlockId, file.Name, file.Size, file.CreatedTs, file.ModTs, dbutil.QuickJson(file.Opts), dbutil.QuickJson(file.Meta))
 		return nil
 	})

pkg/blockstore/blockstore_dbsetup.go

@@ -42,6 +42,9 @@ func InitBlockstore() error {
 	if err != nil {
 		return err
 	}
+	if !stopFlush.Load() {
+		go GBS.runFlusher()
+	}
 	log.Printf("blockstore initialized\n")
 	return nil
 }

pkg/blockstore/blockstore_test.go

@@ -565,7 +565,7 @@ func TestSimpleDBFlush(t *testing.T) {
 		t.Fatalf("error writing data: %v", err)
 	}
 	checkFileData(t, ctx, blockId, fileName, "hello world!")
-	err = GBS.FlushCache(ctx)
+	_, err = GBS.FlushCache(ctx)
 	if err != nil {
 		t.Fatalf("error flushing cache: %v", err)
 	}

pkg/service/objectservice/objectservice.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log"
 	"strings"
 	"time"
 
@@ -108,6 +109,19 @@ func (svc *ObjectService) SetActiveTab(uiContext wstore.UIContext, tabId string)
 	if err != nil {
 		return nil, fmt.Errorf("error setting active tab: %w", err)
 	}
+	// check all blocks in tab and start controllers (if necessary)
+	tab, err := wstore.DBMustGet[*wstore.Tab](ctx, tabId)
+	if err != nil {
+		return nil, fmt.Errorf("error getting tab: %w", err)
+	}
+	for _, blockId := range tab.BlockIds {
+		blockErr := blockcontroller.StartBlockController(ctx, blockId)
+		if blockErr != nil {
+			// we don't want to fail the set active tab operation if a block controller fails to start
+			log.Printf("error starting block controller (blockid:%s): %v", blockId, blockErr)
+			continue
+		}
+	}
 	return updatesRtn(ctx, nil)
 }