### Install slog-zap Go Library

Source: https://github.com/samber/slog-zap/blob/main/README.md

This command installs the `slog-zap` Go library, which provides a `slog.Handler` for `uber-go/zap`. It fetches the module and its dependencies, making it available for use in Go projects.

```Shell
go get github.com/samber/slog-zap/v2
```

--------------------------------

### Basic slog-zap Logger Initialization and Usage Example in Go

Source: https://github.com/samber/slog-zap/blob/main/README.md

Demonstrates how to initialize a `slog` logger using `slog-zap` with a `zap.Logger`, add global attributes to the logger, and log messages at different levels. It includes examples of structured error logging with multiple attributes and info logging with grouped attributes.

```go
import (
    slogzap "github.com/samber/slog-zap/v2"
    "go.uber.org/zap"
    "log/slog"
)

func main() {
    zapLogger, _ := zap.NewProduction()

    logger := slog.New(slogzap.Option{Level: slog.LevelDebug, Logger: zapLogger}.NewZapHandler())
    logger = logger.
        With("environment", "dev").
        With("release", "v1.0.0")

    // log error
    logger.
        With("category", "sql").
        With("query.statement", "SELECT COUNT(*) FROM users;").
        With("query.duration", 1*time.Second).
        With("error", fmt.Errorf("could not count users")).
        Error("caramba!")

    // log user signup
    logger.
        With(
            slog.Group("user",
                slog.String("id", "user-123"),
                slog.Time("created_at", time.Now()),
            ),
        ).
        Info("user registration")
}
```

--------------------------------

### Integrate OpenTelemetry Tracing with slog-zap in Go

Source: https://github.com/samber/slog-zap/blob/main/README.md

Illustrates how to integrate OpenTelemetry tracing with `slog-zap` by configuring a `TracerProvider` and starting a span. It shows how to extract trace and span IDs from the OpenTelemetry context and include them as `slog` attributes using the `slog-otel` library, ensuring trace context propagation in logs.

```go
import (
	slogzap "github.com/samber/slog-zap"
	slogotel "github.com/samber/slog-otel"
	"go.opentelemetry.io/otel/sdk/trace"
)

func main() {
	tp := trace.NewTracerProvider(
		trace.WithSampler(trace.AlwaysSample()),
	)
	tracer := tp.Tracer("hello/world")

	ctx, span := tracer.Start(context.Background(), "foo")
	defer span.End()

	span.AddEvent("bar")

	logger := slog.New(
		slogzap.Option{
			// ...
			AttrFromContext: []func(ctx context.Context) []slog.Attr{
				slogotel.ExtractOtelAttrFromContext([]string{"tracing"}, "trace_id", "span_id"),
			},
		}.NewZapHandler(),
	)

	logger.ErrorContext(ctx, "a message")
}
```

--------------------------------

### Development and Testing Commands for slog-zap

Source: https://github.com/samber/slog-zap/blob/main/README.md

Provides essential `make` commands for developers to set up the development environment, run unit tests, and continuously watch for changes while testing the `slog-zap` project. These commands streamline the development workflow for contributors.

```bash
# Install some dev dependencies
make tools

# Run tests
make test
# or
make watch-test
```

--------------------------------

### Configure Global slog-zap Parameters in Go

Source: https://github.com/samber/slog-zap/blob/main/README.md

Sets global parameters for the `slog-zap` library, including the key used for source information in log output, a list of string keys that should be treated as errors, and a mapping between `slog.Level` and `zapcore.Level` for log level translation.

```go
slogzap.SourceKey = "source"
slogzap.ErrorKeys = []string{"error", "err"}
slogzap.LogLevels = map[slog.Level]zapcore.Level{...}
```

--------------------------------

### Define slog-zap Handler Options in Go

Source: https://github.com/samber/slog-zap/blob/main/README.md

Defines the configuration options for the `slog-zap` handler, allowing customization of the log level, underlying Zap logger instance, attribute conversion logic, context-based attribute extraction, and standard `slog.HandlerOptions` like source addition and attribute replacement.

```go
type Option struct {
	// log level (default: debug)
	Level slog.Leveler

	// optional: zap logger (default: zap.L())
	Logger *zap.Logger

	// optional: customize json payload builder
	Converter Converter
    // optional: fetch attributes from context
    AttrFromContext []func(ctx context.Context) []slog.Attr

	// optional: see slog.HandlerOptions
	AddSource   bool
	ReplaceAttr func(groups []string, a slog.Attr) slog.Attr
}
```

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