From 89a7a946dcd500b01b772a2f418c8adf0ea9a5bd Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Tue, 3 Nov 2020 11:29:41 +0300
Subject: [PATCH] [#187] sdk: Implement IsSupportedVersion function

Implement function that checks the compatibility of the specified version
with the current NeoFS revision.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/version.go      | 17 +++++++++++++++++
 pkg/version_test.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/pkg/version.go b/pkg/version.go
index 6ffc54c4..a1c83165 100644
--- a/pkg/version.go
+++ b/pkg/version.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+	"github.com/pkg/errors"
 )
 
 // Version represents v2-compatible version.
@@ -65,3 +66,19 @@ func (v *Version) ToV2() *refs.Version {
 func (v *Version) String() string {
 	return fmt.Sprintf("v%d.%d", v.GetMajor(), v.GetMinor())
 }
+
+// IsSupportedVersion returns error if v is not supported by current SDK.
+func IsSupportedVersion(v *Version) error {
+	switch mjr := v.GetMajor(); mjr {
+	case 2:
+		switch mnr := v.GetMinor(); mnr {
+		case 0:
+			return nil
+		}
+	}
+
+	return errors.Errorf("unsupported version %d.%d",
+		v.GetMajor(),
+		v.GetMinor(),
+	)
+}
diff --git a/pkg/version_test.go b/pkg/version_test.go
index 18e842a6..a5cc7fa3 100644
--- a/pkg/version_test.go
+++ b/pkg/version_test.go
@@ -29,3 +29,36 @@ func TestSDKVersion(t *testing.T) {
 	require.Equal(t, uint32(sdkMjr), v.GetMajor())
 	require.Equal(t, uint32(sdkMnr), v.GetMinor())
 }
+
+func TestIsSupportedVersion(t *testing.T) {
+	require.Error(t, IsSupportedVersion(nil))
+
+	v := NewVersion()
+
+	v.SetMajor(1)
+	require.Error(t, IsSupportedVersion(v))
+
+	v.SetMajor(3)
+	require.Error(t, IsSupportedVersion(v))
+
+	for _, item := range []struct {
+		mjr, maxMnr uint32
+	}{
+		{
+			mjr:    2,
+			maxMnr: 0,
+		},
+	} {
+		v.SetMajor(item.mjr)
+
+		for i := uint32(0); i < item.maxMnr; i++ {
+			v.SetMinor(i)
+
+			require.NoError(t, IsSupportedVersion(v))
+		}
+
+		v.SetMinor(item.maxMnr + 1)
+
+		require.Error(t, IsSupportedVersion(v))
+	}
+}