diff --git a/README.md b/README.md index a8c29bf..8969526 100644 --- a/README.md +++ b/README.md @@ -91,11 +91,12 @@ logr design but also left out some parts and changed others: | 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` | +| Pass context for extracting additional values | no API | API variants like `InfoCtx` | 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. +alternative API, with [interoperability](#slog-interoperability) provided by +some conversion functions. ### Inspiration @@ -145,24 +146,24 @@ There are implementations for the following logging libraries: ## 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`. +and using the `slog.Logger` API with a `logr.LogSink`. `FromSlogHandler` and +`ToSlogHandler` 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. +slog API. -## Using a `logr.Sink` as backend for slog +### Using a `logr.LogSink` 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 +implementing both the normal logr interface(s) and `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 +without the need to convert parameters. `FromSlogHandler` and `ToSlogHandler` 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 +`ToSlogHandler` has to use a wrapper which adjusts the verbosity for future log calls. Such an implementation should also support values that implement specific @@ -187,13 +188,13 @@ Not supporting slog has several drawbacks: 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 `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 +- Stack unwinding is done by the `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. @@ -205,27 +206,39 @@ 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 +### 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. +slog. `NewContextWithSlogLogger` and `FromContextAsSlogLogger` can be +used to fill this gap. They store and retrieve a `slog.Logger` pointer +under the same context key that is also used by `NewContext` and +`FromContext` for `logr.Logger` value. + +When `NewContextWithSlogLogger` is followed by `FromContext`, the latter will +automatically convert the `slog.Logger` to a +`logr.Logger`. `FromContextAsSlogLogger` does the same for the other direction. + +With this approach, binaries which use either slog or logr are as efficient as +possible with no unnecessary allocations. This is also why the API stores a +`slog.Logger` pointer: when storing a `slog.Handler`, creating a `slog.Logger` +on retrieval would need to allocate one. + +The downside is that switching back and forth needs more allocations. Because +logr is the API that is already in use by different packages, in particular +Kubernetes, the recommendation is to use the `logr.Logger` API in code which +uses contextual logging. + +An alternative to adding values to a logger and storing that logger in the +context is to store the values in the context and to configure a logging +backend to extract those values when emitting log entries. This only works when +log calls are passed the context, which is not supported by the logr API. + +With the slog API, it is possible, but not +required. https://github.com/veqryn/slog-context is a package for slog which +provides additional support code for this approach. It also contains wrappers +for the context functions in logr, so developers who prefer to not use the logr +APIs directly can use those instead and the resulting code will still be +interoperable with logr. ## FAQ diff --git a/context.go b/context.go new file mode 100644 index 0000000..de8bcc3 --- /dev/null +++ b/context.go @@ -0,0 +1,33 @@ +/* +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 logr + +// contextKey is how we find Loggers in a context.Context. With Go < 1.21, +// the value is always a Logger value. With Go >= 1.21, the value can be a +// Logger value or a slog.Logger pointer. +type contextKey struct{} + +// notFoundError exists to carry an IsNotFound method. +type notFoundError struct{} + +func (notFoundError) Error() string { + return "no logr.Logger was present" +} + +func (notFoundError) IsNotFound() bool { + return true +} diff --git a/context_noslog.go b/context_noslog.go new file mode 100644 index 0000000..f012f9a --- /dev/null +++ b/context_noslog.go @@ -0,0 +1,49 @@ +//go:build !go1.21 +// +build !go1.21 + +/* +Copyright 2019 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 logr + +import ( + "context" +) + +// FromContext returns a Logger from ctx or an error if no Logger is found. +func FromContext(ctx context.Context) (Logger, error) { + if v, ok := ctx.Value(contextKey{}).(Logger); ok { + return v, nil + } + + return Logger{}, notFoundError{} +} + +// FromContextOrDiscard returns a Logger from ctx. If no Logger is found, this +// returns a Logger that discards all log messages. +func FromContextOrDiscard(ctx context.Context) Logger { + if v, ok := ctx.Value(contextKey{}).(Logger); ok { + return v + } + + return Discard() +} + +// NewContext returns a new Context, derived from ctx, which carries the +// provided Logger. +func NewContext(ctx context.Context, logger Logger) context.Context { + return context.WithValue(ctx, contextKey{}, logger) +} diff --git a/context_slog.go b/context_slog.go new file mode 100644 index 0000000..065ef0b --- /dev/null +++ b/context_slog.go @@ -0,0 +1,83 @@ +//go:build go1.21 +// +build go1.21 + +/* +Copyright 2019 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 logr + +import ( + "context" + "fmt" + "log/slog" +) + +// FromContext returns a Logger from ctx or an error if no Logger is found. +func FromContext(ctx context.Context) (Logger, error) { + v := ctx.Value(contextKey{}) + if v == nil { + return Logger{}, notFoundError{} + } + + switch v := v.(type) { + case Logger: + return v, nil + case *slog.Logger: + return FromSlogHandler(v.Handler()), nil + default: + // Not reached. + panic(fmt.Sprintf("unexpected value type for logr context key: %T", v)) + } +} + +// FromContextAsSlogLogger returns a slog.Logger from ctx or nil if no such Logger is found. +func FromContextAsSlogLogger(ctx context.Context) *slog.Logger { + v := ctx.Value(contextKey{}) + if v == nil { + return nil + } + + switch v := v.(type) { + case Logger: + return slog.New(ToSlogHandler(v)) + case *slog.Logger: + return v + default: + // Not reached. + panic(fmt.Sprintf("unexpected value type for logr context key: %T", v)) + } +} + +// FromContextOrDiscard returns a Logger from ctx. If no Logger is found, this +// returns a Logger that discards all log messages. +func FromContextOrDiscard(ctx context.Context) Logger { + if logger, err := FromContext(ctx); err == nil { + return logger + } + return Discard() +} + +// NewContext returns a new Context, derived from ctx, which carries the +// provided Logger. +func NewContext(ctx context.Context, logger Logger) context.Context { + return context.WithValue(ctx, contextKey{}, logger) +} + +// NewContextWithSlogLogger returns a new Context, derived from ctx, which carries the +// provided slog.Logger. +func NewContextWithSlogLogger(ctx context.Context, logger *slog.Logger) context.Context { + return context.WithValue(ctx, contextKey{}, logger) +} diff --git a/slogr/example/main.go b/examples/slog/main.go similarity index 93% rename from slogr/example/main.go rename to examples/slog/main.go index c6379d2..599d156 100644 --- a/slogr/example/main.go +++ b/examples/slog/main.go @@ -28,7 +28,6 @@ import ( "github.com/go-logr/logr" "github.com/go-logr/logr/funcr" - "github.com/go-logr/logr/slogr" ) type e struct { @@ -62,7 +61,7 @@ func main() { Level: slog.Level(-1), } handler := slog.NewJSONHandler(os.Stderr, &opts) - logrLogger := slogr.NewLogr(handler) + logrLogger := logr.FromSlogHandler(handler) logrExample(logrLogger) logrLogger = funcr.NewJSON( @@ -72,7 +71,7 @@ func main() { LogTimestamp: true, Verbosity: 1, }) - slogLogger := slog.New(slogr.NewSlogHandler(logrLogger)) + slogLogger := slog.New(logr.ToSlogHandler(logrLogger)) slogExample(slogLogger) } @@ -91,7 +90,7 @@ func logrExample(log logr.Logger) { func slogExample(log *slog.Logger) { // There's no guarantee that this logs the right source code location. - // It works for Go 1.21.0 by compensating in slogr.NewSlogHandler + // It works for Go 1.21.0 by compensating in logr.ToSlogHandler // for the additional callers, but those might change. log = log.With("saved", "value") log.Info("1) hello", "val1", 1, "val2", map[string]int{"k": 1}) diff --git a/logr.go b/logr.go index 2a5075a..b4428e1 100644 --- a/logr.go +++ b/logr.go @@ -207,10 +207,6 @@ limitations under the License. // those. package logr -import ( - "context" -) - // New returns a new Logger instance. This is primarily used by libraries // implementing LogSink, rather than end users. Passing a nil sink will create // a Logger which discards all log lines. @@ -410,45 +406,6 @@ func (l Logger) IsZero() bool { return l.sink == nil } -// contextKey is how we find Loggers in a context.Context. -type contextKey struct{} - -// FromContext returns a Logger from ctx or an error if no Logger is found. -func FromContext(ctx context.Context) (Logger, error) { - if v, ok := ctx.Value(contextKey{}).(Logger); ok { - return v, nil - } - - return Logger{}, notFoundError{} -} - -// notFoundError exists to carry an IsNotFound method. -type notFoundError struct{} - -func (notFoundError) Error() string { - return "no logr.Logger was present" -} - -func (notFoundError) IsNotFound() bool { - return true -} - -// FromContextOrDiscard returns a Logger from ctx. If no Logger is found, this -// returns a Logger that discards all log messages. -func FromContextOrDiscard(ctx context.Context) Logger { - if v, ok := ctx.Value(contextKey{}).(Logger); ok { - return v - } - - return Discard() -} - -// NewContext returns a new Context, derived from ctx, which carries the -// provided Logger. -func NewContext(ctx context.Context, logger Logger) context.Context { - return context.WithValue(ctx, contextKey{}, logger) -} - // RuntimeInfo holds information that the logr "core" library knows which // LogSinks might want to know. type RuntimeInfo struct { diff --git a/slogr/sloghandler.go b/sloghandler.go similarity index 83% rename from slogr/sloghandler.go rename to sloghandler.go index ec6725c..7d406d7 100644 --- a/slogr/sloghandler.go +++ b/sloghandler.go @@ -17,18 +17,16 @@ See the License for the specific language governing permissions and limitations under the License. */ -package slogr +package logr 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 + sink LogSink // Non-nil if sink is non-nil and implements SlogSink. slogSink SlogSink @@ -90,15 +88,15 @@ func (l *slogHandler) Handle(ctx context.Context, record slog.Record) error { // 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 +// slog.New(ToSlogHandler(...)). 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 +// This cannot be done when constructing the handler because FromSlogHandler 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 { +func (l *slogHandler) sinkWithCallDepth() LogSink { + if sink, ok := l.sink.(CallDepthLogSink); ok { return sink.WithCallDepth(2) } return l.sink @@ -148,21 +146,22 @@ func (l *slogHandler) addGroupPrefix(name string) string { // 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 +// passed to a 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) +// +// logrV0 := getMyLogger() +// logrV2 := logrV0.V(2) +// slogV2 := slog.New(logr.ToSlogHandler(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 + result += l.levelBias // in case the original Logger had a V level if result < 0 { - result = 0 // because logr.LogSink doesn't expect negative V levels + result = 0 // because LogSink doesn't expect negative V levels } return int(result) } diff --git a/slogr.go b/slogr.go new file mode 100644 index 0000000..28a83d0 --- /dev/null +++ b/slogr.go @@ -0,0 +1,100 @@ +//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 logr + +import ( + "context" + "log/slog" +) + +// FromSlogHandler returns a 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 FromSlogHandler(handler slog.Handler) Logger { + if handler, ok := handler.(*slogHandler); ok { + if handler.sink == nil { + return Discard() + } + return New(handler.sink).V(int(handler.levelBias)) + } + return New(&slogSink{handler: handler}) +} + +// ToSlogHandler returns a slog.Handler which writes to the same sink as the 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 Logger: +// +// logger := +// slog.New(ToSlogHandler(logger.V(10))).Error(...) -> logSink.Error(...) +// +// The level of all other records gets reduced by the verbosity +// level of the 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(ToSlogHandler(logger)).Debug(...) -> logger.GetSink().Info(level=4, ...) +// slog.New(ToSlogHandler(logger)).Warning(...) -> logger.GetSink().Info(level=0, ...) +// slog.New(ToSlogHandler(logger)).Info(...) -> logger.GetSink().Info(level=0, ...) +// slog.New(ToSlogHandler(logger.V(4))).Info(...) -> logger.GetSink().Info(level=4, ...) +func ToSlogHandler(logger 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 (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 FromSlogHandler +// and ToSlogHandler. +type SlogSink interface { + LogSink + + Handle(ctx context.Context, record slog.Record) error + WithAttrs(attrs []slog.Attr) SlogSink + WithGroup(name string) SlogSink +} diff --git a/slogr/slogr.go b/slogr/slogr.go index eb519ae..4fdf3b6 100644 --- a/slogr/slogr.go +++ b/slogr/slogr.go @@ -23,10 +23,11 @@ limitations under the License. // // See the README in the top-level [./logr] package for a discussion of // interoperability. +// +// Deprecated: use the main logr package instead. package slogr import ( - "context" "log/slog" "github.com/go-logr/logr" @@ -34,75 +35,20 @@ import ( // 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. +// Deprecated: use [logr.FromSlogHandler] instead. 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}) + return logr.FromSlogHandler(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 := -// slog.New(NewSlogHandler(logger.V(10))).Error(...) -> logSink.Error(...) +// ToSlogHandler returns a slog.Handler which writes to the same sink as the logr.Logger. // -// 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 +// Deprecated: use [logr.ToSlogHandler] instead. +func ToSlogHandler(logger logr.Logger) slog.Handler { + return logr.ToSlogHandler(logger) } // 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: +// logging through the slog.Logger or slog.Handler APIs better. // -// - 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 -} +// Deprecated: use [logr.SlogSink] instead. +type SlogSink = logr.SlogSink diff --git a/slogr/slogr_test.go b/slogr_test.go similarity index 82% rename from slogr/slogr_test.go rename to slogr_test.go index 2e5f0ff..fff6fb5 100644 --- a/slogr/slogr_test.go +++ b/slogr_test.go @@ -17,7 +17,7 @@ See the License for the specific language governing permissions and limitations under the License. */ -package slogr_test +package logr_test import ( "bytes" @@ -36,7 +36,6 @@ import ( "github.com/go-logr/logr" "github.com/go-logr/logr/funcr" - "github.com/go-logr/logr/slogr" ) var debugWithoutTime = &slog.HandlerOptions{ @@ -49,12 +48,12 @@ var debugWithoutTime = &slog.HandlerOptions{ Level: slog.LevelDebug, } -func ExampleNew() { - logger := slogr.NewLogr(slog.NewTextHandler(os.Stdout, debugWithoutTime)) +func ExampleFromSlogHandler() { + logrLogger := logr.FromSlogHandler(slog.NewTextHandler(os.Stdout, debugWithoutTime)) - logger.Info("hello world") - logger.Error(errors.New("fake error"), "ignore me") - logger.WithValues("x", 1, "y", 2).WithValues("str", "abc").WithName("foo").WithName("bar").V(4).Info("with values, verbosity and name") + logrLogger.Info("hello world") + logrLogger.Error(errors.New("fake error"), "ignore me") + logrLogger.WithValues("x", 1, "y", 2).WithValues("str", "abc").WithName("foo").WithName("bar").V(4).Info("with values, verbosity and name") // Output: // level=INFO msg="hello world" @@ -62,7 +61,7 @@ func ExampleNew() { // level=DEBUG msg="with values, verbosity and name" x=1 y=2 str=abc logger=foo/bar } -func ExampleNewSlogLogger() { +func ExampleToSlogHandler() { funcrLogger := funcr.New(func(prefix, args string) { if prefix != "" { fmt.Fprintln(os.Stdout, prefix, args) @@ -73,13 +72,13 @@ func ExampleNewSlogLogger() { Verbosity: 10, }) - logger := slog.New(slogr.NewSlogHandler(funcrLogger)) - logger.Info("hello world") - logger.Error("ignore me", "err", errors.New("fake error")) - logger.With("x", 1, "y", 2).WithGroup("group").With("str", "abc").Warn("with values and group") + slogLogger := slog.New(logr.ToSlogHandler(funcrLogger)) + slogLogger.Info("hello world") + slogLogger.Error("ignore me", "err", errors.New("fake error")) + slogLogger.With("x", 1, "y", 2).WithGroup("group").With("str", "abc").Warn("with values and group") - logger = slog.New(slogr.NewSlogHandler(funcrLogger.V(int(-slog.LevelDebug)))) - logger.Info("info message reduced to debug level") + slogLogger = slog.New(logr.ToSlogHandler(funcrLogger.V(int(-slog.LevelDebug)))) + slogLogger.Info("info message reduced to debug level") // Output: // "level"=0 "msg"="hello world" @@ -92,7 +91,7 @@ func TestWithCallDepth(t *testing.T) { debugWithCaller := *debugWithoutTime debugWithCaller.AddSource = true var buffer bytes.Buffer - logger := slogr.NewLogr(slog.NewTextHandler(&buffer, &debugWithCaller)) + logger := logr.FromSlogHandler(slog.NewTextHandler(&buffer, &debugWithCaller)) logHelper(logger) _, file, line, _ := runtime.Caller(0) @@ -116,7 +115,7 @@ func TestJSONHandler(t *testing.T) { } var _ logr.LogSink = testSlogSink{} -var _ slogr.SlogSink = testSlogSink{} +var _ logr.SlogSink = testSlogSink{} // testSlogSink is only used through slog and thus doesn't need to implement the // normal LogSink methods. @@ -134,10 +133,10 @@ func (s testSlogSink) WithValues(...interface{}) logr.LogSink { return s } func (s testSlogSink) Handle(ctx context.Context, record slog.Record) error { return s.handler.Handle(ctx, record) } -func (s testSlogSink) WithAttrs(attrs []slog.Attr) slogr.SlogSink { +func (s testSlogSink) WithAttrs(attrs []slog.Attr) logr.SlogSink { return testSlogSink{handler: s.handler.WithAttrs(attrs)} } -func (s testSlogSink) WithGroup(name string) slogr.SlogSink { +func (s testSlogSink) WithGroup(name string) logr.SlogSink { return testSlogSink{handler: s.handler.WithGroup(name)} } @@ -178,7 +177,7 @@ func TestFuncrHandler(t *testing.T) { func testSlog(t *testing.T, createLogger func(buffer *bytes.Buffer) logr.Logger, exceptions ...string) { var buffer bytes.Buffer logger := createLogger(&buffer) - handler := slogr.NewSlogHandler(logger) + handler := logr.ToSlogHandler(logger) err := slogtest.TestHandler(handler, func() []map[string]any { var ms []map[string]any for _, line := range bytes.Split(buffer.Bytes(), []byte{'\n'}) { @@ -223,28 +222,28 @@ func containsOne(hay string, needles ...string) bool { } func TestDiscard(t *testing.T) { - logger := slog.New(slogr.NewSlogHandler(logr.Discard())) + logger := slog.New(logr.ToSlogHandler(logr.Discard())) logger.WithGroup("foo").With("x", 1).Info("hello") } func TestConversion(t *testing.T) { d := logr.Discard() - d2 := slogr.NewLogr(slogr.NewSlogHandler(d)) + d2 := logr.FromSlogHandler(logr.ToSlogHandler(d)) expectEqual(t, d, d2) e := logr.Logger{} - e2 := slogr.NewLogr(slogr.NewSlogHandler(e)) + e2 := logr.FromSlogHandler(logr.ToSlogHandler(e)) expectEqual(t, e, e2) f := funcr.New(func(prefix, args string) {}, funcr.Options{}) - f2 := slogr.NewLogr(slogr.NewSlogHandler(f)) + f2 := logr.FromSlogHandler(logr.ToSlogHandler(f)) expectEqual(t, f, f2) text := slog.NewTextHandler(io.Discard, nil) - text2 := slogr.NewSlogHandler(slogr.NewLogr(text)) + text2 := logr.ToSlogHandler(logr.FromSlogHandler(text)) expectEqual(t, text, text2) - text3 := slogr.NewSlogHandler(slogr.NewLogr(text).V(1)) + text3 := logr.ToSlogHandler(logr.FromSlogHandler(text).V(1)) if handler, ok := text3.(interface { GetLevel() slog.Level }); ok { diff --git a/slogr/slogsink.go b/slogsink.go similarity index 85% rename from slogr/slogsink.go rename to slogsink.go index 6fbac56..93fa4e5 100644 --- a/slogr/slogsink.go +++ b/slogsink.go @@ -17,24 +17,22 @@ See the License for the specific language governing permissions and limitations under the License. */ -package slogr +package logr import ( "context" "log/slog" "runtime" "time" - - "github.com/go-logr/logr" ) var ( - _ logr.LogSink = &slogSink{} - _ logr.CallDepthLogSink = &slogSink{} - _ Underlier = &slogSink{} + _ LogSink = &slogSink{} + _ CallDepthLogSink = &slogSink{} + _ Underlier = &slogSink{} ) -// Underlier is implemented by the LogSink returned by NewLogr. +// Underlier is implemented by the LogSink returned by NewFromLogHandler. type Underlier interface { // GetUnderlying returns the Handler used by the LogSink. GetUnderlying() slog.Handler @@ -54,7 +52,7 @@ type slogSink struct { handler slog.Handler } -func (l *slogSink) Init(info logr.RuntimeInfo) { +func (l *slogSink) Init(info RuntimeInfo) { l.callDepth = info.CallDepth } @@ -62,7 +60,7 @@ func (l *slogSink) GetUnderlying() slog.Handler { return l.handler } -func (l *slogSink) WithCallDepth(depth int) logr.LogSink { +func (l *slogSink) WithCallDepth(depth int) LogSink { newLogger := *l newLogger.callDepth += depth return &newLogger @@ -96,7 +94,7 @@ func (l *slogSink) log(err error, msg string, level slog.Level, kvList ...interf l.handler.Handle(context.Background(), record) } -func (l slogSink) WithName(name string) logr.LogSink { +func (l slogSink) WithName(name string) LogSink { if l.name != "" { l.name = l.name + "/" } @@ -104,7 +102,7 @@ func (l slogSink) WithName(name string) logr.LogSink { return &l } -func (l slogSink) WithValues(kvList ...interface{}) logr.LogSink { +func (l slogSink) WithValues(kvList ...interface{}) LogSink { l.handler = l.handler.WithAttrs(kvListToAttrs(kvList...)) return &l }