Merge pull request #870 from ydb-platform/errors-brief-test

added `metrics.TestErrorBrief` + allowed to create `xerrors.TransportError()` from grpc status error

metrics/error_brief.go

@@ -0,0 +1,55 @@
+package metrics
+
+import (
+	"context"
+	"io"
+	"net"
+
+	"github.com/ydb-platform/ydb-go-sdk/v3/internal/allocator"
+	"github.com/ydb-platform/ydb-go-sdk/v3/internal/xerrors"
+)
+
+func errorBrief(err error) string {
+	if err == nil {
+		return "OK"
+	}
+	if xerrors.Is(err, io.EOF) {
+		return "io/EOF"
+	}
+	if netErr := (*net.OpError)(nil); xerrors.As(err, &netErr) {
+		buffer := allocator.Buffers.Get()
+		defer allocator.Buffers.Put(buffer)
+		buffer.WriteString("network")
+		if netErr.Op != "" {
+			buffer.WriteByte('/')
+			buffer.WriteString(netErr.Op)
+		}
+		if netErr.Addr != nil {
+			buffer.WriteByte('[')
+			buffer.WriteString(netErr.Addr.String())
+			buffer.WriteByte(']')
+		}
+		if netErr.Err != nil {
+			buffer.WriteByte('(')
+			buffer.WriteString(errorBrief(netErr.Err))
+			buffer.WriteByte(')')
+		}
+		return buffer.String()
+	}
+	if xerrors.Is(err, context.DeadlineExceeded) {
+		return "context/DeadlineExceeded"
+	}
+	if xerrors.Is(err, context.Canceled) {
+		return "context/Canceled"
+	}
+	if xerrors.IsTransportError(err) {
+		return xerrors.TransportError(err).Name()
+	}
+	if xerrors.IsOperationError(err) {
+		return xerrors.OperationError(err).Name()
+	}
+	if ydbErr := xerrors.Error(nil); xerrors.As(err, &ydbErr) {
+		return ydbErr.Name()
+	}
+	return "unknown"
+}