Serve the menu on an HTTP server

cmd/main.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"io"
+	"net/http"
 	"os"
 	"path"
 
@@ -23,6 +25,65 @@ var (
 	scriptDir = path.Join("services", "registration")
 )
 
+
+type LocalHandler struct {
+	sessionId string
+}	
+
+func NewLocalHandler() *LocalHandler {
+	return &LocalHandler{
+		sessionId: "",
+	}
+}
+
+type RequestParser interface {
+	GetSessionId(*http.Request) (string, error)
+	GetInput(*http.Request) ([]byte, error)
+}
+
+type DefaultRequestParser struct {
+}
+
+func(rp *DefaultRequestParser) GetSessionId(rq *http.Request) (string, error) {
+	v := rq.Header.Get("X-Vise-Session")
+	if v == "" {
+		return "", fmt.Errorf("no session found")
+	}
+	return v, nil
+}
+
+func(rp *DefaultRequestParser) GetInput(rq *http.Request) ([]byte, error) {
+	defer rq.Body.Close()
+	v, err := io.ReadAll(rq.Body)
+	if err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+type DefaultSessionHandler struct {
+	cfgTemplate engine.Config
+	rp RequestParser
+	rh *LocalHandler
+	dbDir string
+	resourceDir string
+}
+
+func NewDefaultSessionHandler(dbDir string, resourceDir string, rp RequestParser, outputSize uint32, flagCount uint32) *DefaultSessionHandler {
+	rh := NewLocalHandler()
+	return &DefaultSessionHandler{
+		cfgTemplate: engine.Config{
+			OutputSize: outputSize,
+			Root: "root",
+			FlagCount: flagCount,
+		},
+		rh: rh,
+		rp: rp,
+		dbDir: dbDir,
+		resourceDir: resourceDir,
+	}
+}
+
 func getParser(fp string, debug bool) (*asm.FlagParser, error) {
 	flagParser := asm.NewFlagParser().WithDebug()
 	_, err := flagParser.Load(fp)
@@ -74,29 +135,29 @@ func getHandler(appFlags *asm.FlagParser, rs *resource.DbResource, pe *persist.P
 	return ussdHandlers, nil
 }
 
-func getPersister(dbDir string, ctx context.Context) (*persist.Persister, error) {
+func(f *DefaultSessionHandler) getPersister(ctx context.Context) (*persist.Persister, error) {
-	err := os.MkdirAll(dbDir, 0700)
+	err := os.MkdirAll(f.dbDir, 0700)
 	if err != nil {
 		return nil, fmt.Errorf("state dir create exited with error: %v\n", err)
 	}
 	store := gdbmdb.NewGdbmDb()
-	storeFile := path.Join(dbDir, "state.gdbm")
+	storeFile := path.Join(f.dbDir, "state.gdbm")
 	store.Connect(ctx, storeFile)
 	pr := persist.NewPersister(store)
 	return pr, nil
 }
 
-func getUserdataDb(dbDir string, ctx context.Context) db.Db {
+func(f *DefaultSessionHandler) getUserdataDb(ctx context.Context) db.Db {
 	store := gdbmdb.NewGdbmDb()
-	storeFile := path.Join(dbDir, "userdata.gdbm")
+	storeFile := path.Join(f.dbDir, "userdata.gdbm")
 	store.Connect(ctx, storeFile)
 
 	return store
 }
 
-func getResource(resourceDir string, ctx context.Context) (resource.Resource, error) {
+func(f *DefaultSessionHandler) getResource(ctx context.Context) (resource.Resource, error) {
 	store := fsdb.NewFsDb()
-	err := store.Connect(ctx, resourceDir)
+	err := store.Connect(ctx, f.resourceDir)
 	if err != nil {
 		return nil, err
 	}
@@ -104,87 +165,144 @@ func getResource(resourceDir string, ctx context.Context) (resource.Resource, er
 	return rfs, nil
 }
 
-func getEngine(cfg engine.Config, rs resource.Resource, pr *persist.Persister) *engine.DefaultEngine {
+func(f *DefaultSessionHandler) getEngine(rs resource.Resource, pr *persist.Persister, sessionId string) *engine.DefaultEngine {
+	cfg := f.cfgTemplate
+	cfg.SessionId = sessionId
 	en := engine.NewEngine(cfg, rs)
 	en = en.WithPersister(pr)
 	return en
 }
 
+func(f *DefaultSessionHandler) writeError(w http.ResponseWriter, code int, msg string, err error) {
+	w.Header().Set("X-Vise", msg + ": " + err.Error())
+	w.Header().Set("Content-Length", "0")
+	w.WriteHeader(code)
+	_, err = w.Write([]byte{})
+	if err != nil {
+		w.WriteHeader(500)
+		w.Header().Set("X-Vise", err.Error())
+	}
+	return 
+}
+
+func(f *DefaultSessionHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	var r bool
+
+	sessionId, err := f.rp.GetSessionId(req)
+	if err != nil {
+		f.writeError(w, 400, "Session missing", err)
+		return
+	}
+
+	input, err := f.rp.GetInput(req)
+	if err != nil {
+		f.writeError(w, 400, "Input read fail", err)
+		return
+	}
+
+	ctx := req.Context()
+	ctx = context.WithValue(ctx, "SessionId", sessionId)
+
+	pfp := path.Join(scriptDir, "pp.csv")
+	flagParser, err := getParser(pfp, true)
+	if err != nil {
+		f.writeError(w, 500, "flagParser failed with error:", err)
+		return
+	}
+
+	rs, err := f.getResource(ctx)
+	if err != nil {
+		f.writeError(w, 500, "getResource failed with error:", err)
+		return
+	}
+
+	pr, err := f.getPersister(ctx)
+	if err != nil {
+		f.writeError(w, 500, "getPersister failed with error:", err)
+		return
+	}
+
+	store := f.getUserdataDb(ctx)
+	
+	dbResource, ok := rs.(*resource.DbResource)
+	if !ok {
+		f.writeError(w, 500, "getHandler exited with error:", err)
+		return
+	}
+
+	hl, err := getHandler(flagParser, dbResource, pr, store)
+	if err != nil {
+		f.writeError(w, 500, "getHandler exited with error:", err)
+		return
+	}
+
+	en := f.getEngine(rs, pr, sessionId)
+	en = en.WithFirst(hl.Init)
+
+	if len(input) == 0 {
+		r, err = en.Init(ctx)
+	} else {
+		r, err = en.Exec(ctx, input)
+	}
+	if err != nil {
+		f.writeError(w, 500, "Engine exec fail", err)
+		return
+	}
+
+	// _, err = en.Init(ctx)
+	// if err != nil {
+	// 	f.writeError(w, 500, "Engine exec fail", err)
+	// 	return
+	// }
+
+	// err = engine.Loop(ctx, en, os.Stdin, os.Stdout)
+	// if err != nil {
+	// 	f.writeError(w, 500, "Loop exec fail", err)
+	// 	return
+	// }
+
+	w.WriteHeader(200)
+	w.Header().Set("Content-Type", "text/plain")
+	_, err = en.WriteResult(ctx, w)
+	if err != nil {
+		f.writeError(w, 500, "Write result fail", err)
+		return
+	}
+
+	_ = r
+}
+
 func main() {
+	var host string
+	var port string
 	var dbDir string
 	var resourceDir string
 	var size uint
+	var flagCount uint
 	var sessionId string
 	var debug bool
+	flag.StringVar(&host, "h", "127.0.0.1", "http host")
+	flag.StringVar(&port, "p", "7123", "http port")
 	flag.StringVar(&sessionId, "session-id", "075xx2123", "session id")
 	flag.StringVar(&dbDir, "dbdir", ".state", "database dir to read from")
 	flag.StringVar(&resourceDir, "resourcedir", path.Join("services", "registration"), "resource dir")
 	flag.BoolVar(&debug, "d", false, "use engine debug output")
 	flag.UintVar(&size, "s", 160, "max size of output")
+	flag.UintVar(&flagCount, "f", 16, "flag count")
 	flag.Parse()
 
-	logg.Infof("start command", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size)
+	logg.Infof("starting server", "dbdir", dbDir, "resourcedir", resourceDir, "outputsize", size, "flagCount", flagCount)
 
-	ctx := context.Background()
+	rp := &DefaultRequestParser{}
-	ctx = context.WithValue(ctx, "SessionId", sessionId)
+	h := NewDefaultSessionHandler(dbDir, resourceDir, rp, uint32(size), uint32(flagCount))
-	pfp := path.Join(scriptDir, "pp.csv")
+	s := &http.Server{
-	flagParser, err := getParser(pfp, true)
+		Addr: fmt.Sprintf("%s:%s", host, port),
+		Handler: h,
+	}
 
+	err := s.ListenAndServe()
 	if err != nil {
-		os.Exit(1)
+		fmt.Fprintf(os.Stderr, "Server error: %s", err)
-	}
-
-	cfg := engine.Config{
-		Root:       "root",
-		SessionId:  sessionId,
-		OutputSize: uint32(size),
-		FlagCount:  uint32(16),
-	}
-
-	rs, err := getResource(resourceDir, ctx)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
-		os.Exit(1)
-	}
-
-	pr, err := getPersister(dbDir, ctx)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
-		os.Exit(1)
-	}
-
-	store := getUserdataDb(dbDir, ctx)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
-		os.Exit(1)
-	}
-
-	dbResource, ok := rs.(*resource.DbResource)
-	if !ok {
-		os.Exit(1)
-	}
-
-	hl, err := getHandler(flagParser, dbResource, pr, store)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
-		os.Exit(1)
-	}
-
-	en := getEngine(cfg, rs, pr)
-	en = en.WithFirst(hl.Init)
-	if debug {
-		en = en.WithDebug(nil)
-	}
-
-	_, err = en.Init(ctx)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "engine init exited with error: %v\n", err)
-		os.Exit(1)
-	}
-
-	err = engine.Loop(ctx, en, os.Stdin, os.Stdout)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "loop exited with error: %v\n", err)
 		os.Exit(1)
 	}
 }