Golang dbg.Warn函數代碼示例

func NewDup(from, to string) Redirs {
	switch from {
	case "1", "2":
	default:
		dbg.Warn("%s: unknown dup %s", addr, from)
		nerrors++
		return nil
	}
	switch to {
	case "1", "2":
	default:
		dbg.Warn("%s: unknown dup %s", addr, to)
		nerrors++
		return nil
	}
	if from == to {
		dbg.Warn("%s: stupid dup %s %s", addr, from, to)
		nerrors++
		return nil
	}
	return []*Redir{
		{
			From: int(from[0] - '0'),
			To:   int(to[0] - '0'),
			Name: "|=",
		},
	}
}

// If ln is "path addr" and addr is of the form
// net ! addr ! proto ! tree ! path
// or
// /one/path
// the dial the tree and walk to the path.
func specialForm(ln string) (string, zx.Dir) {
	if len(ln)==0 || ln[0]!='/' {
		return "", nil
	}
	toks := strings.Fields(ln)
	if len(toks)!=2 || len(toks[0])==0 || len(toks[1])==0 {
		return "", nil
	}
	p, addr := toks[0], toks[1]
	if addr[0] == '/' {
		addr = "*!*!lfs!main!" + addr
	}
	atoks := strings.SplitN(addr, "!", -1)
	if len(atoks) < 2 {
		return "", nil
	}
	t, err := rfs.Import(addr)
	if err != nil {
		dbg.Warn("ns: %s: import: %s", ln, err)
		return "", nil
	}
	path := "/"
	if len(atoks)>=5 && atoks[2]!="lfs" {
		path = atoks[4]
	}
	d, err := zx.Stat(t, path)
	if err != nil {
		dbg.Warn("ns: %s: stat: %s", ln, err)
		return "", nil
	}
	return p, d
}

/*
	Authenticate the wax server. To be called early within the
	handler function for wax pages. It returns false if auth failed
	and the handler should return without handling anything.
	When TLS is disabled, or there's no key file, auth is considered ok.
*/
func Auth(w http.ResponseWriter, r *http.Request) bool {
	if auth.TLSserver == nil || !auth.Enabled {
		return true
	}
	clive, err := r.Cookie("clive")
	if err != nil {
		dbg.Warn("wax/auth: no cookie: %s", err)
		failed(w)
		return false
	}
	toks := strings.SplitN(string(clive.Value), ":", 2)
	if len(toks) < 2 {
		dbg.Warn("wax/auth: wrong cookie")
		failed(w)
		return false
	}
	ch, resp := toks[0], toks[1]
	u, ok := auth.ChallengeResponseOk("wax", ch, resp)
	if !ok {
		dbg.Warn("wax/auth: failed for %s", u)
		failed(w)
		return false
	}
	return ok
}

// Make a new repl for the given name and local and remote tree addresses.
// Pred defaults to exclude all dot files and dirs: 'name~^\.&prune|true'
func New(name, pred, laddr, raddr string) (*Repl, error) {
	r := &Repl{
		Name: name,
		Laddr: laddr,
		Raddr: raddr,
		pred: pred,
	}
	r.vprintf = dbg.FlagPrintf(os.Stdout, &r.Verb)
	if err := r.dial(); err != nil {
		return nil, err
	}
	var err, rerr error
	r.Ldb, err = sync.NewDB(name + "[" + laddr + "]", pred, r.lfs)
	if err != nil {
		dbg.Warn("%s: %s", laddr, err)
	}
	r.Rdb, rerr = sync.NewDB(name + "[" + raddr + "]", pred, r.rfs)
	if rerr != nil {
		err = rerr
		dbg.Warn("%s: %s", raddr, rerr)
	}
	r.Ldb.Pred = r.pred
	r.Rdb.Pred = r.pred
	return r, err
}

func main() {
	defer dbg.Exits("")
	os.Args[0] = "zxdump"
	dfltdump := zx.Path(dbg.Home, "dump")
	opts.NewFlag("s", "don't dump right now, wait until next at 5am", &Skip)
	opts.NewFlag("1", "dump once and exit", &Once)
	opts.NewFlag("v", "verbose", &Verbose)
	opts.NewFlag("D", "debug", &Debug)
	opts.NewFlag("x", "expr: files excluded (.*, tmp.* if none given); tmp always excluded.", &Xcludes)
	Dump = dfltdump
	opts.NewFlag("d", "dir: where to keep the dump, or empty if none", &Dump)
	args, err := opts.Parse(os.Args)
	if err != nil {
		dbg.Warn("%s", err)
		opts.Usage()
		dbg.Exits(err)
	}
	if len(Xcludes) == 0 {
		Xcludes = []string{".*", "tmp.*", "*.tmp"}
	}
	Xcludes = append(Xcludes, "tmp")
	if len(args) == 0 {
		dbg.Warn("arguments missing")
		opts.Usage()
		dbg.Exits("usage")
	}
	if Skip && Once {
		dbg.Fatal("can't skip the current dump and dump once now")
	}
	nt := 0
	ec := make(chan bool)
	for i := 0; i < len(args); i++ {
		al := strings.SplitN(args[i], "!", 2)
		if len(al) == 1 {
			al = append(al, al[0])
			al[0] = path.Base(al[0])
		}
		t, err := lfs.New(al[0], al[1], lfs.RO)
		if err != nil {
			dbg.Warn("%s: %s", al[0], err)
			continue
		}
		t.ReadAttrs(true)
		nt++
		go dump(Dump, t, ec)
	}
	if nt == 0 {
		dbg.Fatal("no trees to dump")
	}
	for nt > 0 {
		<-ec
		nt--
	}
}

/*
	Start the wax web server.
*/
func Serve(port string) error {
	startedlk.Lock()
	defer startedlk.Unlock()
	if started {
		return fmt.Errorf("already started")
	}
	started = true
	http.HandleFunc("/js/", jsHandler)
	if auth.TLSserver != nil {
		dbg.Warn("wax: listening at https://%s:%s\n", dbg.Sys, port)
		return http.ListenAndServeTLS(port, auth.ServerPem, auth.ServerKey, nil)
	}
	dbg.Warn("wax: listening at http://%s:%s\n", dbg.Sys, port)
	return http.ListenAndServe(port, nil)
}

/*
	Check out to see if resp is the expected response for the ch challenge on
	the named auth domain.
	Returns the user who authenticates and the status for authentication.
	Always returns true when Auth is not enabled.
*/
func ChallengeResponseOk(name, ch, resp string) (user string, ok bool) {
	u := dbg.Usr
	if !Enabled {
		return u, true
	}
	if keys==nil || iv==nil {
		return u, false
	}
	u = keys[0].Uid
	key := keys[0].Key
	if name!="" && name!="default" {
		var err error
		ks, err := LoadKey(KeyDir(), name)
		if err != nil {
			dbg.Warn("auth: loadkey %s: %s", name, err)
			return u, false
		}
		u, key = ks[0].Uid, ks[0].Key
	}
	chresp, ok := encrypt(key, iv, []byte(ch))
	if !ok || len(chresp)==0 {
		return u, false
	}
	return u, fmt.Sprintf("%x", chresp) == resp
}

func NewRedir(from, name string, app bool) Redirs {
	if len(from) == 0 {
		return nil
	}

	if len(from) > 1 {
		rdr := NewRedir(from[:1], name, app)
		for i := 1; i < len(from); i++ {
			rdr = append(rdr, NewDup(from[i:i+1], from[:1])...)
		}
		return rdr
	}
	switch from {
	case "0", "1", "2":
	default:
		dbg.Warn("%s: unknown redirect %c", addr, from)
		nerrors++
		return nil
	}
	return []*Redir{
		{
			From: int(from[0] - '0'),
			Name: name,
			App:  app,
		},
	}
}

// called from yacc, to execute a top-level node.
func (nd *Nd) Exec() error {
	if nd==nil || nd.Kind==Nnone || nd.Kind==Nnop {
		return nil
	}
	var err error
	switch nd.Kind {
	case Npipe:
		nd.mkExec(os.Stdin, os.Stdout, os.Stderr, Argv...)
		err = nd.xPipe()
		if err == nil {
			if nd.async() {
				bg.Add(nd)
				go func() {
					err := nd.wait()
					bg.Del(nd, err)
				}()
			} else {
				err = nd.wait()
			}
		}
	case Nset:
		nd.mkExec(os.Stdin, os.Stdout, os.Stderr, Argv...)
		nd.xSet()
		err = nd.wait()
	default:
		dbg.Warn("%s not yet implemented", nd.Kind)
		err = dbg.ErrBug
	}
	setsts(err)
	return err
}

func TestWait(t *testing.T) {
	os.Args[0] = "app.test"
	t.Skip("this is not a test")
	Debug = testing.Verbose()
	defer Exiting()
	c := New()
	c.Args = []string{"proc1"}
	wc := make(chan *Ctx)
	Printf("getting ctx\n")
	go func() {
		c := New()
		c.Args = []string{"proc2"}
		defer Exiting()
		defer dbg.Warn("D2")
		wc <- c
		Printf("print2\n")
		Fatal("ouch")
		dprintf("end2\n")
	}()
	cc := <-wc
	Printf("got ctx\n")
	<-cc.Wait
	Warn("cc sts %v\n", cerror(cc.Wait))
	Fatal("fatal")
	dprintf("end\n")
}

func lfscache(t zx.Tree, fn func()) (zx.Tree, func(), error) {
	m, err := lfs.New("clfs", lfsdir, lfs.RW)
	if err != nil {
		return nil, nil, fmt.Errorf("lfs", err)
	}
	m.SaveAttrs(true)
	m.IOstats = &zx.IOstats{}
	m.Dbg = zdebug
	ncfs.Debug = zdebug
	xfs, err := ncfs.New("cfs", m, t, rflag)
	if err != nil {
		return nil, nil, fmt.Errorf("cfs: %s", err)
	}
	st := &zx.IOstats{}
	xfs.IOstats = st
	if xaddr != "" {
		serve(xfs, xaddr)
	}
	if sflag {
		xfn := func() {
			st.Averages()
			dbg.Warn("%s iostats:\n%s\n", xfs.Name(), st)
			if fn != nil {
				fn()
			}
		}
		return xfs, xfn, nil
	}
	return xfs, fn, nil
}

// no locks, used only at init time
func (t *Fs) reloadChild(f *mFile) {
	ds, err := zx.GetDir(t.lfs, f.d["path"])
	if err != nil {
		dbg.Warn("%s: reload: %s", t.name, err)
		return
	}
	for _, d := range ds {
		if d["path"] == "/Ctl" || d["path" ] == "/Chg" {
			continue
		}
		cf := &mFile{
			name: d["name"],
			d: zx.Dir{
				"name": d["name"],
				"path": d["path"],
				"spath": d["path"],
				"tpath": t.path,
				"type": d["type"],
				"Wuid": d["Wuid"],
				"Sum": d["Sum"],
			},
		}
		for k, v := range d.UsrAttrs() {
			cf.d[k] = v
		}
		f.child = append(f.child, cf)
		if cf.d["type"] == "d" {
			t.reloadChild(cf)
		}
	}
}

func usage(err error) {
	dbg.Warn("%s", err)
	opts.Usage()
	fmt.Fprintf(os.Stderr, "\tspec is name | name!file | name!file!flags \n")
	fmt.Fprintf(os.Stderr, "\tspec flags are ro | rw | ncro | ncrw \n")
	dbg.Exits(err)
}

func ExampleNew() {
	// create a tree
	fs, err := New("example mfs")
	if err != nil {
		dbg.Fatal("lfs: %s", err)
	}
	dbg.Warn("fs %s ready", fs)
	// Now use it...
}

func (c *FileInfo) checkClean() {
	if c.state != CClean && c.state != CUnread && !c.busy {
		dbg.Warn("%s: not clean and not busy: %s", c.path, c.state)
		panic("bugs")
	}
	for _, cc := range c.child {
		cc.checkClean()
	}
}