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rebase: bump the k8s-dependencies group with 1 update

Browse Source 
Bumps the k8s-dependencies group with 1 update: [k8s.io/klog/v2](https://github.com/kubernetes/klog).

- [Release notes](https://github.com/kubernetes/klog/releases)
- [Changelog](https://github.com/kubernetes/klog/blob/main/RELEASE.md)
- [Commits](https://github.com/kubernetes/klog/compare/v2.100.1...v2.110.1)

---
updated-dependencies:
- dependency-name: k8s.io/klog/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: k8s-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
This commit is contained in:
dependabot[bot]
2023-11-06 20:22:58 +00:00
committed by mergify[bot]
parent dc655f03a8
commit 1c1d852080
22 changed files with 1165 additions and 174 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
vendor/github.com/go-logr/logr/README.md generated vendored
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@ -1,6 +1,7 @@
# A minimal logging API for Go
[![Go Reference](https://pkg.go.dev/badge/github.com/go-logr/logr.svg)](https://pkg.go.dev/github.com/go-logr/logr)
[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/go-logr/logr/badge)](https://securityscorecards.dev/viewer/?platform=github.com&org=go-logr&repo=logr)
logr offers an(other) opinion on how Go programs and libraries can do logging
without becoming coupled to a particular logging implementation. This is not
@ -73,6 +74,29 @@ received:
If the Go standard library had defined an interface for logging, this project
probably would not be needed. Alas, here we are.
When the Go developers started developing such an interface with
[slog](https://github.com/golang/go/issues/56345), they adopted some of the
logr design but also left out some parts and changed others:
| Feature | logr | slog |
|---------|------|------|
| High-level API | `Logger` (passed by value) | `Logger` (passed by [pointer](https://github.com/golang/go/issues/59126)) |
| Low-level API | `LogSink` | `Handler` |
| Stack unwinding | done by `LogSink` | done by `Logger` |
| Skipping helper functions | `WithCallDepth`, `WithCallStackHelper` | [not supported by Logger](https://github.com/golang/go/issues/59145) |
| Generating a value for logging on demand | `Marshaler` | `LogValuer` |
| Log levels | >= 0, higher meaning "less important" | positive and negative, with 0 for "info" and higher meaning "more important" |
| Error log entries | always logged, don't have a verbosity level | normal log entries with level >= `LevelError` |
| Passing logger via context | `NewContext`, `FromContext` | no API |
| Adding a name to a logger | `WithName` | no API |
| Modify verbosity of log entries in a call chain | `V` | no API |
| Grouping of key/value pairs | not supported | `WithGroup`, `GroupValue` |
The high-level slog API is explicitly meant to be one of many different APIs
that can be layered on top of a shared `slog.Handler`. logr is one such
alternative API, with [interoperability](#slog-interoperability) provided by the [`slogr`](slogr)
package.
### Inspiration
Before you consider this package, please read [this blog post by the
@ -118,6 +142,91 @@ There are implementations for the following logging libraries:
- **github.com/go-kit/log**: [gokitlogr](https://github.com/tonglil/gokitlogr) (also compatible with github.com/go-kit/kit/log since v0.12.0)
- **bytes.Buffer** (writing to a buffer): [bufrlogr](https://github.com/tonglil/buflogr) (useful for ensuring values were logged, like during testing)
## slog interoperability
Interoperability goes both ways, using the `logr.Logger` API with a `slog.Handler`
and using the `slog.Logger` API with a `logr.LogSink`. [slogr](./slogr) provides `NewLogr` and
`NewSlogHandler` API calls to convert between a `logr.Logger` and a `slog.Handler`.
As usual, `slog.New` can be used to wrap such a `slog.Handler` in the high-level
slog API. `slogr` itself leaves that to the caller.
## Using a `logr.Sink` as backend for slog
Ideally, a logr sink implementation should support both logr and slog by
implementing both the normal logr interface(s) and `slogr.SlogSink`. Because
of a conflict in the parameters of the common `Enabled` method, it is [not
possible to implement both slog.Handler and logr.Sink in the same
type](https://github.com/golang/go/issues/59110).
If both are supported, log calls can go from the high-level APIs to the backend
without the need to convert parameters. `NewLogr` and `NewSlogHandler` can
convert back and forth without adding additional wrappers, with one exception:
when `Logger.V` was used to adjust the verbosity for a `slog.Handler`, then
`NewSlogHandler` has to use a wrapper which adjusts the verbosity for future
log calls.
Such an implementation should also support values that implement specific
interfaces from both packages for logging (`logr.Marshaler`, `slog.LogValuer`,
`slog.GroupValue`). logr does not convert those.
Not supporting slog has several drawbacks:
- Recording source code locations works correctly if the handler gets called
through `slog.Logger`, but may be wrong in other cases. That's because a
`logr.Sink` does its own stack unwinding instead of using the program counter
provided by the high-level API.
- slog levels <= 0 can be mapped to logr levels by negating the level without a
loss of information. But all slog levels > 0 (e.g. `slog.LevelWarning` as
used by `slog.Logger.Warn`) must be mapped to 0 before calling the sink
because logr does not support "more important than info" levels.
- The slog group concept is supported by prefixing each key in a key/value
pair with the group names, separated by a dot. For structured output like
JSON it would be better to group the key/value pairs inside an object.
- Special slog values and interfaces don't work as expected.
- The overhead is likely to be higher.
These drawbacks are severe enough that applications using a mixture of slog and
logr should switch to a different backend.
## Using a `slog.Handler` as backend for logr
Using a plain `slog.Handler` without support for logr works better than the
other direction:
- All logr verbosity levels can be mapped 1:1 to their corresponding slog level
by negating them.
- Stack unwinding is done by the `slogr.SlogSink` and the resulting program
counter is passed to the `slog.Handler`.
- Names added via `Logger.WithName` are gathered and recorded in an additional
attribute with `logger` as key and the names separated by slash as value.
- `Logger.Error` is turned into a log record with `slog.LevelError` as level
and an additional attribute with `err` as key, if an error was provided.
The main drawback is that `logr.Marshaler` will not be supported. Types should
ideally support both `logr.Marshaler` and `slog.Valuer`. If compatibility
with logr implementations without slog support is not important, then
`slog.Valuer` is sufficient.
## Context support for slog
Storing a logger in a `context.Context` is not supported by
slog. `logr.NewContext` and `logr.FromContext` can be used with slog like this
to fill this gap:
func HandlerFromContext(ctx context.Context) slog.Handler {
logger, err := logr.FromContext(ctx)
if err == nil {
return slogr.NewSlogHandler(logger)
}
return slog.Default().Handler()
}
func ContextWithHandler(ctx context.Context, handler slog.Handler) context.Context {
return logr.NewContext(ctx, slogr.NewLogr(handler))
}
The downside is that storing and retrieving a `slog.Handler` needs more
allocations compared to using a `logr.Logger`. Therefore the recommendation is
to use the `logr.Logger` API in code which uses contextual logging.
## FAQ
### Conceptual
@ -241,7 +350,9 @@ Otherwise, you can start out with `0` as "you always want to see this",
Then gradually choose levels in between as you need them, working your way
down from 10 (for debug and trace style logs) and up from 1 (for chattier
info-type logs.)
info-type logs). For reference, slog pre-defines -4 for debug logs
(corresponds to 4 in logr), which matches what is
[recommended for Kubernetes](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-instrumentation/logging.md#what-method-to-use).
#### How do I choose my keys?

18
vendor/github.com/go-logr/logr/SECURITY.md generated vendored Normal file
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@ -0,0 +1,18 @@
# Security Policy
If you have discovered a security vulnerability in this project, please report it
privately. **Do not disclose it as a public issue.** This gives us time to work with you
to fix the issue before public exposure, reducing the chance that the exploit will be
used before a patch is released.
You may submit the report in the following ways:
- send an email to go-logr-security@googlegroups.com
- send us a [private vulnerability report](https://github.com/go-logr/logr/security/advisories/new)
Please provide the following information in your report:
- A description of the vulnerability and its impact
- How to reproduce the issue
We ask that you give us 90 days to work on a fix before public exposure.

48
vendor/github.com/go-logr/logr/funcr/funcr.go generated vendored
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@ -116,17 +116,17 @@ type Options struct {
// Equivalent hooks are offered for key-value pairs saved via
// logr.Logger.WithValues or Formatter.AddValues (see RenderValuesHook) and
// for user-provided pairs (see RenderArgsHook).
RenderBuiltinsHook func(kvList []interface{}) []interface{}
RenderBuiltinsHook func(kvList []any) []any
// RenderValuesHook is the same as RenderBuiltinsHook, except that it is
// only called for key-value pairs saved via logr.Logger.WithValues. See
// RenderBuiltinsHook for more details.
RenderValuesHook func(kvList []interface{}) []interface{}
RenderValuesHook func(kvList []any) []any
// RenderArgsHook is the same as RenderBuiltinsHook, except that it is only
// called for key-value pairs passed directly to Info and Error. See
// RenderBuiltinsHook for more details.
RenderArgsHook func(kvList []interface{}) []interface{}
RenderArgsHook func(kvList []any) []any
// MaxLogDepth tells funcr how many levels of nested fields (e.g. a struct
// that contains a struct, etc.) it may log. Every time it finds a struct,
@ -163,7 +163,7 @@ func (l fnlogger) WithName(name string) logr.LogSink {
return &l
}
func (l fnlogger) WithValues(kvList ...interface{}) logr.LogSink {
func (l fnlogger) WithValues(kvList ...any) logr.LogSink {
l.Formatter.AddValues(kvList)
return &l
}
@ -173,12 +173,12 @@ func (l fnlogger) WithCallDepth(depth int) logr.LogSink {
return &l
}
func (l fnlogger) Info(level int, msg string, kvList ...interface{}) {
func (l fnlogger) Info(level int, msg string, kvList ...any) {
prefix, args := l.FormatInfo(level, msg, kvList)
l.write(prefix, args)
}
func (l fnlogger) Error(err error, msg string, kvList ...interface{}) {
func (l fnlogger) Error(err error, msg string, kvList ...any) {
prefix, args := l.FormatError(err, msg, kvList)
l.write(prefix, args)
}
@ -229,7 +229,7 @@ func newFormatter(opts Options, outfmt outputFormat) Formatter {
type Formatter struct {
outputFormat outputFormat
prefix string
values []interface{}
values []any
valuesStr string
depth int
opts *Options
@ -246,10 +246,10 @@ const (
)
// PseudoStruct is a list of key-value pairs that gets logged as a struct.
type PseudoStruct []interface{}
type PseudoStruct []any
// render produces a log line, ready to use.
func (f Formatter) render(builtins, args []interface{}) string {
func (f Formatter) render(builtins, args []any) string {
// Empirically bytes.Buffer is faster than strings.Builder for this.
buf := bytes.NewBuffer(make([]byte, 0, 1024))
if f.outputFormat == outputJSON {
@ -292,7 +292,7 @@ func (f Formatter) render(builtins, args []interface{}) string {
// This function returns a potentially modified version of kvList, which
// ensures that there is a value for every key (adding a value if needed) and
// that each key is a string (substituting a key if needed).
func (f Formatter) flatten(buf *bytes.Buffer, kvList []interface{}, continuing bool, escapeKeys bool) []interface{} {
func (f Formatter) flatten(buf *bytes.Buffer, kvList []any, continuing bool, escapeKeys bool) []any {
// This logic overlaps with sanitize() but saves one type-cast per key,
// which can be measurable.
if len(kvList)%2 != 0 {
@ -334,7 +334,7 @@ func (f Formatter) flatten(buf *bytes.Buffer, kvList []interface{}, continuing b
return kvList
}
func (f Formatter) pretty(value interface{}) string {
func (f Formatter) pretty(value any) string {
return f.prettyWithFlags(value, 0, 0)
}
@ -343,7 +343,7 @@ const (
)
// TODO: This is not fast. Most of the overhead goes here.
func (f Formatter) prettyWithFlags(value interface{}, flags uint32, depth int) string {
func (f Formatter) prettyWithFlags(value any, flags uint32, depth int) string {
if depth > f.opts.MaxLogDepth {
return `"<max-log-depth-exceeded>"`
}
@ -614,7 +614,7 @@ func isEmpty(v reflect.Value) bool {
return false
}
func invokeMarshaler(m logr.Marshaler) (ret interface{}) {
func invokeMarshaler(m logr.Marshaler) (ret any) {
defer func() {
if r := recover(); r != nil {
ret = fmt.Sprintf("<panic: %s>", r)
@ -675,12 +675,12 @@ func (f Formatter) caller() Caller {
const noValue = "<no-value>"
func (f Formatter) nonStringKey(v interface{}) string {
func (f Formatter) nonStringKey(v any) string {
return fmt.Sprintf("<non-string-key: %s>", f.snippet(v))
}
// snippet produces a short snippet string of an arbitrary value.
func (f Formatter) snippet(v interface{}) string {
func (f Formatter) snippet(v any) string {
const snipLen = 16
snip := f.pretty(v)
@ -693,7 +693,7 @@ func (f Formatter) snippet(v interface{}) string {
// sanitize ensures that a list of key-value pairs has a value for every key
// (adding a value if needed) and that each key is a string (substituting a key
// if needed).
func (f Formatter) sanitize(kvList []interface{}) []interface{} {
func (f Formatter) sanitize(kvList []any) []any {
if len(kvList)%2 != 0 {
kvList = append(kvList, noValue)
}
@ -727,8 +727,8 @@ func (f Formatter) GetDepth() int {
// FormatInfo renders an Info log message into strings. The prefix will be
// empty when no names were set (via AddNames), or when the output is
// configured for JSON.
func (f Formatter) FormatInfo(level int, msg string, kvList []interface{}) (prefix, argsStr string) {
args := make([]interface{}, 0, 64) // using a constant here impacts perf
func (f Formatter) FormatInfo(level int, msg string, kvList []any) (prefix, argsStr string) {
args := make([]any, 0, 64) // using a constant here impacts perf
prefix = f.prefix
if f.outputFormat == outputJSON {
args = append(args, "logger", prefix)
@ -745,10 +745,10 @@ func (f Formatter) FormatInfo(level int, msg string, kvList []interface{}) (pref
}
// FormatError renders an Error log message into strings. The prefix will be
// empty when no names were set (via AddNames), or when the output is
// empty when no names were set (via AddNames), or when the output is
// configured for JSON.
func (f Formatter) FormatError(err error, msg string, kvList []interface{}) (prefix, argsStr string) {
args := make([]interface{}, 0, 64) // using a constant here impacts perf
func (f Formatter) FormatError(err error, msg string, kvList []any) (prefix, argsStr string) {
args := make([]any, 0, 64) // using a constant here impacts perf
prefix = f.prefix
if f.outputFormat == outputJSON {
args = append(args, "logger", prefix)
@ -761,12 +761,12 @@ func (f Formatter) FormatError(err error, msg string, kvList []interface{}) (pre
args = append(args, "caller", f.caller())
}
args = append(args, "msg", msg)
var loggableErr interface{}
var loggableErr any
if err != nil {
loggableErr = err.Error()
}
args = append(args, "error", loggableErr)
return f.prefix, f.render(args, kvList)
return prefix, f.render(args, kvList)
}
// AddName appends the specified name. funcr uses '/' characters to separate
@ -781,7 +781,7 @@ func (f *Formatter) AddName(name string) {
// AddValues adds key-value pairs to the set of saved values to be logged with
// each log line.
func (f *Formatter) AddValues(kvList []interface{}) {
func (f *Formatter) AddValues(kvList []any) {
// Three slice args forces a copy.
n := len(f.values)
f.values = append(f.values[:n:n], kvList...)

35
vendor/github.com/go-logr/logr/logr.go generated vendored
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@ -127,9 +127,9 @@ limitations under the License.
// such a value can call its methods without having to check whether the
// instance is ready for use.
//
// Calling methods with the null logger (Logger{}) as instance will crash
// because it has no LogSink. Therefore this null logger should never be passed
// around. For cases where passing a logger is optional, a pointer to Logger
// The zero logger (= Logger{}) is identical to Discard() and discards all log
// entries. Code that receives a Logger by value can simply call it, the methods
// will never crash. For cases where passing a logger is optional, a pointer to Logger
// should be used.
//
// # Key Naming Conventions
@ -258,6 +258,12 @@ type Logger struct {
// Enabled tests whether this Logger is enabled. For example, commandline
// flags might be used to set the logging verbosity and disable some info logs.
func (l Logger) Enabled() bool {
// Some implementations of LogSink look at the caller in Enabled (e.g.
// different verbosity levels per package or file), but we only pass one
// CallDepth in (via Init). This means that all calls from Logger to the
// LogSink's Enabled, Info, and Error methods must have the same number of
// frames. In other words, Logger methods can't call other Logger methods
// which call these LogSink methods unless we do it the same in all paths.
return l.sink != nil && l.sink.Enabled(l.level)
}
@ -267,11 +273,11 @@ func (l Logger) Enabled() bool {
// line. The key/value pairs can then be used to add additional variable
// information. The key/value pairs must alternate string keys and arbitrary
// values.
func (l Logger) Info(msg string, keysAndValues ...interface{}) {
func (l Logger) Info(msg string, keysAndValues ...any) {
if l.sink == nil {
return
}
if l.Enabled() {
if l.sink.Enabled(l.level) { // see comment in Enabled
if withHelper, ok := l.sink.(CallStackHelperLogSink); ok {
withHelper.GetCallStackHelper()()
}
@ -289,7 +295,7 @@ func (l Logger) Info(msg string, keysAndValues ...interface{}) {
// while the err argument should be used to attach the actual error that
// triggered this log line, if present. The err parameter is optional
// and nil may be passed instead of an error instance.
func (l Logger) Error(err error, msg string, keysAndValues ...interface{}) {
func (l Logger) Error(err error, msg string, keysAndValues ...any) {
if l.sink == nil {
return
}
@ -314,9 +320,16 @@ func (l Logger) V(level int) Logger {
return l
}
// GetV returns the verbosity level of the logger. If the logger's LogSink is
// nil as in the Discard logger, this will always return 0.
func (l Logger) GetV() int {
// 0 if l.sink nil because of the if check in V above.
return l.level
}
// WithValues returns a new Logger instance with additional key/value pairs.
// See Info for documentation on how key/value pairs work.
func (l Logger) WithValues(keysAndValues ...interface{}) Logger {
func (l Logger) WithValues(keysAndValues ...any) Logger {
if l.sink == nil {
return l
}
@ -467,15 +480,15 @@ type LogSink interface {
// The level argument is provided for optional logging. This method will
// only be called when Enabled(level) is true. See Logger.Info for more
// details.
Info(level int, msg string, keysAndValues ...interface{})
Info(level int, msg string, keysAndValues ...any)
// Error logs an error, with the given message and key/value pairs as
// context. See Logger.Error for more details.
Error(err error, msg string, keysAndValues ...interface{})
Error(err error, msg string, keysAndValues ...any)
// WithValues returns a new LogSink with additional key/value pairs. See
// Logger.WithValues for more details.
WithValues(keysAndValues ...interface{}) LogSink
WithValues(keysAndValues ...any) LogSink
// WithName returns a new LogSink with the specified name appended. See
// Logger.WithName for more details.
@ -546,5 +559,5 @@ type Marshaler interface {
// with exported fields
//
// It may return any value of any type.
MarshalLog() interface{}
MarshalLog() any
}

168
vendor/github.com/go-logr/logr/slogr/sloghandler.go generated vendored Normal file
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@ -0,0 +1,168 @@
//go:build go1.21
// +build go1.21
/*
Copyright 2023 The logr 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 slogr
import (
"context"
"log/slog"
"github.com/go-logr/logr"
)
type slogHandler struct {
// May be nil, in which case all logs get discarded.
sink logr.LogSink
// Non-nil if sink is non-nil and implements SlogSink.
slogSink SlogSink
// groupPrefix collects values from WithGroup calls. It gets added as
// prefix to value keys when handling a log record.
groupPrefix string
// levelBias can be set when constructing the handler to influence the
// slog.Level of log records. A positive levelBias reduces the
// slog.Level value. slog has no API to influence this value after the
// handler got created, so it can only be set indirectly through
// Logger.V.
levelBias slog.Level
}
var _ slog.Handler = &slogHandler{}
// groupSeparator is used to concatenate WithGroup names and attribute keys.
const groupSeparator = "."
// GetLevel is used for black box unit testing.
func (l *slogHandler) GetLevel() slog.Level {
return l.levelBias
}
func (l *slogHandler) Enabled(ctx context.Context, level slog.Level) bool {
return l.sink != nil && (level >= slog.LevelError || l.sink.Enabled(l.levelFromSlog(level)))
}
func (l *slogHandler) Handle(ctx context.Context, record slog.Record) error {
if l.slogSink != nil {
// Only adjust verbosity level of log entries < slog.LevelError.
if record.Level < slog.LevelError {
record.Level -= l.levelBias
}
return l.slogSink.Handle(ctx, record)
}
// No need to check for nil sink here because Handle will only be called
// when Enabled returned true.
kvList := make([]any, 0, 2*record.NumAttrs())
record.Attrs(func(attr slog.Attr) bool {
if attr.Key != "" {
kvList = append(kvList, l.addGroupPrefix(attr.Key), attr.Value.Resolve().Any())
}
return true
})
if record.Level >= slog.LevelError {
l.sinkWithCallDepth().Error(nil, record.Message, kvList...)
} else {
level := l.levelFromSlog(record.Level)
l.sinkWithCallDepth().Info(level, record.Message, kvList...)
}
return nil
}
// sinkWithCallDepth adjusts the stack unwinding so that when Error or Info
// are called by Handle, code in slog gets skipped.
//
// This offset currently (Go 1.21.0) works for calls through
// slog.New(NewSlogHandler(...)). There's no guarantee that the call
// chain won't change. Wrapping the handler will also break unwinding. It's
// still better than not adjusting at all....
//
// This cannot be done when constructing the handler because NewLogr needs
// access to the original sink without this adjustment. A second copy would
// work, but then WithAttrs would have to be called for both of them.
func (l *slogHandler) sinkWithCallDepth() logr.LogSink {
if sink, ok := l.sink.(logr.CallDepthLogSink); ok {
return sink.WithCallDepth(2)
}
return l.sink
}
func (l *slogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
if l.sink == nil || len(attrs) == 0 {
return l
}
copy := *l
if l.slogSink != nil {
copy.slogSink = l.slogSink.WithAttrs(attrs)
copy.sink = copy.slogSink
} else {
kvList := make([]any, 0, 2*len(attrs))
for _, attr := range attrs {
if attr.Key != "" {
kvList = append(kvList, l.addGroupPrefix(attr.Key), attr.Value.Resolve().Any())
}
}
copy.sink = l.sink.WithValues(kvList...)
}
return &copy
}
func (l *slogHandler) WithGroup(name string) slog.Handler {
if l.sink == nil {
return l
}
copy := *l
if l.slogSink != nil {
copy.slogSink = l.slogSink.WithGroup(name)
copy.sink = l.slogSink
} else {
copy.groupPrefix = copy.addGroupPrefix(name)
}
return &copy
}
func (l *slogHandler) addGroupPrefix(name string) string {
if l.groupPrefix == "" {
return name
}
return l.groupPrefix + groupSeparator + name
}
// levelFromSlog adjusts the level by the logger's verbosity and negates it.
// It ensures that the result is >= 0. This is necessary because the result is
// passed to a logr.LogSink and that API did not historically document whether
// levels could be negative or what that meant.
//
// Some example usage:
// logrV0 := getMyLogger()
// logrV2 := logrV0.V(2)
// slogV2 := slog.New(slogr.NewSlogHandler(logrV2))
// slogV2.Debug("msg") // =~ logrV2.V(4) =~ logrV0.V(6)
// slogV2.Info("msg") // =~ logrV2.V(0) =~ logrV0.V(2)
// slogv2.Warn("msg") // =~ logrV2.V(-4) =~ logrV0.V(0)
func (l *slogHandler) levelFromSlog(level slog.Level) int {
result := -level
result += l.levelBias // in case the original logr.Logger had a V level
if result < 0 {
result = 0 // because logr.LogSink doesn't expect negative V levels
}
return int(result)
}

108
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//go:build go1.21
// +build go1.21
/*
Copyright 2023 The logr 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 slogr enables usage of a slog.Handler with logr.Logger as front-end
// API and of a logr.LogSink through the slog.Handler and thus slog.Logger
// APIs.
//
// See the README in the top-level [./logr] package for a discussion of
// interoperability.
package slogr
import (
"context"
"log/slog"
"github.com/go-logr/logr"
)
// NewLogr returns a logr.Logger which writes to the slog.Handler.
//
// The logr verbosity level is mapped to slog levels such that V(0) becomes
// slog.LevelInfo and V(4) becomes slog.LevelDebug.
func NewLogr(handler slog.Handler) logr.Logger {
if handler, ok := handler.(*slogHandler); ok {
if handler.sink == nil {
return logr.Discard()
}
return logr.New(handler.sink).V(int(handler.levelBias))
}
return logr.New(&slogSink{handler: handler})
}
// NewSlogHandler returns a slog.Handler which writes to the same sink as the logr.Logger.
//
// The returned logger writes all records with level >= slog.LevelError as
// error log entries with LogSink.Error, regardless of the verbosity level of
// the logr.Logger:
//
// logger := <some logr.Logger with 0 as verbosity level>
// slog.New(NewSlogHandler(logger.V(10))).Error(...) -> logSink.Error(...)
//
// The level of all other records gets reduced by the verbosity
// level of the logr.Logger and the result is negated. If it happens
// to be negative, then it gets replaced by zero because a LogSink
// is not expected to handled negative levels:
//
// slog.New(NewSlogHandler(logger)).Debug(...) -> logger.GetSink().Info(level=4, ...)
// slog.New(NewSlogHandler(logger)).Warning(...) -> logger.GetSink().Info(level=0, ...)
// slog.New(NewSlogHandler(logger)).Info(...) -> logger.GetSink().Info(level=0, ...)
// slog.New(NewSlogHandler(logger.V(4))).Info(...) -> logger.GetSink().Info(level=4, ...)
func NewSlogHandler(logger logr.Logger) slog.Handler {
if sink, ok := logger.GetSink().(*slogSink); ok && logger.GetV() == 0 {
return sink.handler
}
handler := &slogHandler{sink: logger.GetSink(), levelBias: slog.Level(logger.GetV())}
if slogSink, ok := handler.sink.(SlogSink); ok {
handler.slogSink = slogSink
}
return handler
}
// SlogSink is an optional interface that a LogSink can implement to support
// logging through the slog.Logger or slog.Handler APIs better. It then should
// also support special slog values like slog.Group. When used as a
// slog.Handler, the advantages are:
//
// - stack unwinding gets avoided in favor of logging the pre-recorded PC,
// as intended by slog
// - proper grouping of key/value pairs via WithGroup
// - verbosity levels > slog.LevelInfo can be recorded
// - less overhead
//
// Both APIs (logr.Logger and slog.Logger/Handler) then are supported equally
// well. Developers can pick whatever API suits them better and/or mix
// packages which use either API in the same binary with a common logging
// implementation.
//
// This interface is necessary because the type implementing the LogSink
// interface cannot also implement the slog.Handler interface due to the
// different prototype of the common Enabled method.
//
// An implementation could support both interfaces in two different types, but then
// additional interfaces would be needed to convert between those types in NewLogr
// and NewSlogHandler.
type SlogSink interface {
logr.LogSink
Handle(ctx context.Context, record slog.Record) error
WithAttrs(attrs []slog.Attr) SlogSink
WithGroup(name string) SlogSink
}

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//go:build go1.21
// +build go1.21
/*
Copyright 2023 The logr 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 slogr
import (
"context"
"log/slog"
"runtime"
"time"
"github.com/go-logr/logr"
)
var (
_ logr.LogSink = &slogSink{}
_ logr.CallDepthLogSink = &slogSink{}
_ Underlier = &slogSink{}
)
// Underlier is implemented by the LogSink returned by NewLogr.
type Underlier interface {
// GetUnderlying returns the Handler used by the LogSink.
GetUnderlying() slog.Handler
}
const (
// nameKey is used to log the `WithName` values as an additional attribute.
nameKey = "logger"
// errKey is used to log the error parameter of Error as an additional attribute.
errKey = "err"
)
type slogSink struct {
callDepth int
name string
handler slog.Handler
}
func (l *slogSink) Init(info logr.RuntimeInfo) {
l.callDepth = info.CallDepth
}
func (l *slogSink) GetUnderlying() slog.Handler {
return l.handler
}
func (l *slogSink) WithCallDepth(depth int) logr.LogSink {
newLogger := *l
newLogger.callDepth += depth
return &newLogger
}
func (l *slogSink) Enabled(level int) bool {
return l.handler.Enabled(context.Background(), slog.Level(-level))
}
func (l *slogSink) Info(level int, msg string, kvList ...interface{}) {
l.log(nil, msg, slog.Level(-level), kvList...)
}
func (l *slogSink) Error(err error, msg string, kvList ...interface{}) {
l.log(err, msg, slog.LevelError, kvList...)
}
func (l *slogSink) log(err error, msg string, level slog.Level, kvList ...interface{}) {
var pcs [1]uintptr
// skip runtime.Callers, this function, Info/Error, and all helper functions above that.
runtime.Callers(3+l.callDepth, pcs[:])
record := slog.NewRecord(time.Now(), level, msg, pcs[0])
if l.name != "" {
record.AddAttrs(slog.String(nameKey, l.name))
}
if err != nil {
record.AddAttrs(slog.Any(errKey, err))
}
record.Add(kvList...)
l.handler.Handle(context.Background(), record)
}
func (l slogSink) WithName(name string) logr.LogSink {
if l.name != "" {
l.name = l.name + "/"
}
l.name += name
return &l
}
func (l slogSink) WithValues(kvList ...interface{}) logr.LogSink {
l.handler = l.handler.WithAttrs(kvListToAttrs(kvList...))
return &l
}
func kvListToAttrs(kvList ...interface{}) []slog.Attr {
// We don't need the record itself, only its Add method.
record := slog.NewRecord(time.Time{}, 0, "", 0)
record.Add(kvList...)
attrs := make([]slog.Attr, 0, record.NumAttrs())
record.Attrs(func(attr slog.Attr) bool {
attrs = append(attrs, attr)
return true
})
return attrs
}