feat(logic): add context extraction util

x/logic/predicate/utils.go

@@ -0,0 +1,22 @@
+package predicate
+
+import (
+	"context"
+	"fmt"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// UnwrapSDKContext retrieves a Context from a context.Context instance
+// attached with WrapSDKContext. It panics if a Context was not properly
+// attached.
+func UnwrapSDKContext(ctx context.Context) (sdk.Context, error) {
+	if sdkCtx, ok := ctx.(sdk.Context); ok {
+		return sdkCtx, nil
+	}
+	if sdkCtx, ok := ctx.Value(sdk.SdkContextKey).(sdk.Context); ok {
+		return sdkCtx, nil
+	}
+
+	return sdk.Context{}, fmt.Errorf("no sdk.Context found in context")
+}