rebase: update kubernetes to 1.30

updating kubernetes to 1.30 release

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/klog/v2/internal/verbosity/verbosity.go

@@ -0,0 +1,303 @@
+/*
+Copyright 2013 Google Inc. All Rights Reserved.
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package verbosity
+
+import (
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+)
+
+// New returns a struct that implements -v and -vmodule support. Changing and
+// checking these settings is thread-safe, with all concurrency issues handled
+// internally.
+func New() *VState {
+	vs := new(VState)
+
+	// The two fields must have a pointer to the overal struct for their
+	// implementation of Set.
+	vs.vmodule.vs = vs
+	vs.verbosity.vs = vs
+
+	return vs
+}
+
+// Value is an extension that makes it possible to use the values in pflag.
+type Value interface {
+	flag.Value
+	Type() string
+}
+
+func (vs *VState) V() Value {
+	return &vs.verbosity
+}
+
+func (vs *VState) VModule() Value {
+	return &vs.vmodule
+}
+
+// VState contains settings and state. Some of its fields can be accessed
+// through atomic read/writes, in other cases a mutex must be held.
+type VState struct {
+	mu sync.Mutex
+
+	// These flags are modified only under lock, although verbosity may be fetched
+	// safely using atomic.LoadInt32.
+	vmodule   moduleSpec // The state of the -vmodule flag.
+	verbosity levelSpec  // V logging level, the value of the -v flag/
+
+	// pcs is used in V to avoid an allocation when computing the caller's PC.
+	pcs [1]uintptr
+	// vmap is a cache of the V Level for each V() call site, identified by PC.
+	// It is wiped whenever the vmodule flag changes state.
+	vmap map[uintptr]Level
+	// filterLength stores the length of the vmodule filter chain. If greater
+	// than zero, it means vmodule is enabled. It may be read safely
+	// using sync.LoadInt32, but is only modified under mu.
+	filterLength int32
+}
+
+// Level must be an int32 to support atomic read/writes.
+type Level int32
+
+type levelSpec struct {
+	vs *VState
+	l  Level
+}
+
+// get returns the value of the level.
+func (l *levelSpec) get() Level {
+	return Level(atomic.LoadInt32((*int32)(&l.l)))
+}
+
+// set sets the value of the level.
+func (l *levelSpec) set(val Level) {
+	atomic.StoreInt32((*int32)(&l.l), int32(val))
+}
+
+// String is part of the flag.Value interface.
+func (l *levelSpec) String() string {
+	return strconv.FormatInt(int64(l.l), 10)
+}
+
+// Get is part of the flag.Getter interface. It returns the
+// verbosity level as int32.
+func (l *levelSpec) Get() interface{} {
+	return int32(l.l)
+}
+
+// Type is part of pflag.Value.
+func (l *levelSpec) Type() string {
+	return "Level"
+}
+
+// Set is part of the flag.Value interface.
+func (l *levelSpec) Set(value string) error {
+	v, err := strconv.ParseInt(value, 10, 32)
+	if err != nil {
+		return err
+	}
+	l.vs.mu.Lock()
+	defer l.vs.mu.Unlock()
+	l.vs.set(Level(v), l.vs.vmodule.filter, false)
+	return nil
+}
+
+// moduleSpec represents the setting of the -vmodule flag.
+type moduleSpec struct {
+	vs     *VState
+	filter []modulePat
+}
+
+// modulePat contains a filter for the -vmodule flag.
+// It holds a verbosity level and a file pattern to match.
+type modulePat struct {
+	pattern string
+	literal bool // The pattern is a literal string
+	level   Level
+}
+
+// match reports whether the file matches the pattern. It uses a string
+// comparison if the pattern contains no metacharacters.
+func (m *modulePat) match(file string) bool {
+	if m.literal {
+		return file == m.pattern
+	}
+	match, _ := filepath.Match(m.pattern, file)
+	return match
+}
+
+func (m *moduleSpec) String() string {
+	// Lock because the type is not atomic. TODO: clean this up.
+	// Empty instances don't have and don't need a lock (can
+	// happen when flag uses introspection).
+	if m.vs != nil {
+		m.vs.mu.Lock()
+		defer m.vs.mu.Unlock()
+	}
+	var b bytes.Buffer
+	for i, f := range m.filter {
+		if i > 0 {
+			b.WriteRune(',')
+		}
+		fmt.Fprintf(&b, "%s=%d", f.pattern, f.level)
+	}
+	return b.String()
+}
+
+// Get is part of the (Go 1.2)  flag.Getter interface. It always returns nil for this flag type since the
+// struct is not exported.
+func (m *moduleSpec) Get() interface{} {
+	return nil
+}
+
+// Type is part of pflag.Value
+func (m *moduleSpec) Type() string {
+	return "pattern=N,..."
+}
+
+var errVmoduleSyntax = errors.New("syntax error: expect comma-separated list of filename=N")
+
+// Set will sets module value
+// Syntax: -vmodule=recordio=2,file=1,gfs*=3
+func (m *moduleSpec) Set(value string) error {
+	var filter []modulePat
+	for _, pat := range strings.Split(value, ",") {
+		if len(pat) == 0 {
+			// Empty strings such as from a trailing comma can be ignored.
+			continue
+		}
+		patLev := strings.Split(pat, "=")
+		if len(patLev) != 2 || len(patLev[0]) == 0 || len(patLev[1]) == 0 {
+			return errVmoduleSyntax
+		}
+		pattern := patLev[0]
+		v, err := strconv.ParseInt(patLev[1], 10, 32)
+		if err != nil {
+			return errors.New("syntax error: expect comma-separated list of filename=N")
+		}
+		if v < 0 {
+			return errors.New("negative value for vmodule level")
+		}
+		if v == 0 {
+			continue // Ignore. It's harmless but no point in paying the overhead.
+		}
+		// TODO: check syntax of filter?
+		filter = append(filter, modulePat{pattern, isLiteral(pattern), Level(v)})
+	}
+	m.vs.mu.Lock()
+	defer m.vs.mu.Unlock()
+	m.vs.set(m.vs.verbosity.l, filter, true)
+	return nil
+}
+
+// isLiteral reports whether the pattern is a literal string, that is, has no metacharacters
+// that require filepath.Match to be called to match the pattern.
+func isLiteral(pattern string) bool {
+	return !strings.ContainsAny(pattern, `\*?[]`)
+}
+
+// set sets a consistent state for V logging.
+// The mutex must be held.
+func (vs *VState) set(l Level, filter []modulePat, setFilter bool) {
+	// Turn verbosity off so V will not fire while we are in transition.
+	vs.verbosity.set(0)
+	// Ditto for filter length.
+	atomic.StoreInt32(&vs.filterLength, 0)
+
+	// Set the new filters and wipe the pc->Level map if the filter has changed.
+	if setFilter {
+		vs.vmodule.filter = filter
+		vs.vmap = make(map[uintptr]Level)
+	}
+
+	// Things are consistent now, so enable filtering and verbosity.
+	// They are enabled in order opposite to that in V.
+	atomic.StoreInt32(&vs.filterLength, int32(len(filter)))
+	vs.verbosity.set(l)
+}
+
+// Enabled checks whether logging is enabled at the given level. This must be
+// called with depth=0 when the caller of enabled will do the logging and
+// higher values when more stack levels need to be skipped.
+//
+// The mutex will be locked only if needed.
+func (vs *VState) Enabled(level Level, depth int) bool {
+	// This function tries hard to be cheap unless there's work to do.
+	// The fast path is two atomic loads and compares.
+
+	// Here is a cheap but safe test to see if V logging is enabled globally.
+	if vs.verbosity.get() >= level {
+		return true
+	}
+
+	// It's off globally but vmodule may still be set.
+	// Here is another cheap but safe test to see if vmodule is enabled.
+	if atomic.LoadInt32(&vs.filterLength) > 0 {
+		// Now we need a proper lock to use the logging structure. The pcs field
+		// is shared so we must lock before accessing it. This is fairly expensive,
+		// but if V logging is enabled we're slow anyway.
+		vs.mu.Lock()
+		defer vs.mu.Unlock()
+		if runtime.Callers(depth+2, vs.pcs[:]) == 0 {
+			return false
+		}
+		// runtime.Callers returns "return PCs", but we want
+		// to look up the symbolic information for the call,
+		// so subtract 1 from the PC. runtime.CallersFrames
+		// would be cleaner, but allocates.
+		pc := vs.pcs[0] - 1
+		v, ok := vs.vmap[pc]
+		if !ok {
+			v = vs.setV(pc)
+		}
+		return v >= level
+	}
+	return false
+}
+
+// setV computes and remembers the V level for a given PC
+// when vmodule is enabled.
+// File pattern matching takes the basename of the file, stripped
+// of its .go suffix, and uses filepath.Match, which is a little more
+// general than the *? matching used in C++.
+// Mutex is held.
+func (vs *VState) setV(pc uintptr) Level {
+	fn := runtime.FuncForPC(pc)
+	file, _ := fn.FileLine(pc)
+	// The file is something like /a/b/c/d.go. We want just the d.
+	file = strings.TrimSuffix(file, ".go")
+	if slash := strings.LastIndex(file, "/"); slash >= 0 {
+		file = file[slash+1:]
+	}
+	for _, filter := range vs.vmodule.filter {
+		if filter.match(file) {
+			vs.vmap[pc] = filter.level
+			return filter.level
+		}
+	}
+	vs.vmap[pc] = 0
+	return 0
+}