attrs.go

package btclog

import (
	"context"
	"encoding/hex"
	"log/slog"
)

// Hex is a convenience function for a hex-encoded log attributes.
func Hex(key string, value []byte) slog.Attr {
	h := hex.EncodeToString(value)

	return slog.String(key, h)
}

type attrsKey struct{}

// WithCtx returns a copy of the context with which the logging attributes are
// associated.
//
// Usage:
//
//	ctx := log.WithCtx(ctx, "height", 1234)
//	...
//	log.Info(ctx, "Height processed") // Will contain attribute: height=1234
func WithCtx(ctx context.Context, attrs ...any) context.Context {
	return context.WithValue(ctx, attrsKey{}, mergeAttrs(ctx, attrs))
}

// mergeAttrs returns the attributes from the context merged with the provided attributes.
func mergeAttrs(ctx context.Context, attrs []any) []any {
	resp, _ := ctx.Value(attrsKey{}).([]any) // We know the type.
	resp = append(resp, attrs...)

	return resp
}