[client, management] offload client config generation to the client (#6711)

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>
Co-authored-by: crn4 <vladimir@netbird.io>
Co-authored-by: pascal <pascal@netbird.io>

shared/management/grpc/sync_message_versions.go

@@ -0,0 +1,67 @@
+package grpc
+
+import (
+	"errors"
+	"fmt"
+)
+
+type SyncMessageVersion uint16
+
+const (
+	Base SyncMessageVersion = iota
+	ComponentNetworkMap
+)
+
+const DefaultSyncMessageVersion = Base
+const HighestSyncMessageVersion = ComponentNetworkMap
+
+var ErrorUnrecognizedSyncMessageVersion = errors.New("unrecognized SyncMessageVersion")
+
+func ValidateSyncMessageVersion(v *int) error {
+	// empty list == we support all available versions
+	if v == nil {
+		return nil
+	}
+	if *v < 0 || *v > int(HighestSyncMessageVersion) {
+		return fmt.Errorf("sync message version must between 0 and %d, %w", HighestSyncMessageVersion, ErrorUnrecognizedSyncMessageVersion)
+	}
+	return nil
+}
+
+// returns SyncMessage version from config, or highest available version if the config is missing or
+// base if it is invalid
+// the assumption is ValidateSyncMessageVersion() has been called before using SyncMessageVersionFromConfig()
+func SyncMessageVersionFromConfig(v *int) SyncMessageVersion {
+	if v == nil {
+		return DefaultSyncMessageVersion
+	}
+	if *v < 0 || *v > int(HighestSyncMessageVersion) {
+		return Base
+	}
+
+	return SyncMessageVersion(*v)
+}
+
+// convert per-account supported versions to SyncMessageVersion
+// the assumption is ValidateSyncMessageVersion() has been called before using SyncMessageVersionsFromMap()
+func SyncMessageVersionsFromMap(toconvert map[string]int) map[string]SyncMessageVersion {
+	// no per-account overrides
+	if len(toconvert) == 0 {
+		return nil
+	}
+
+	toret := make(map[string]SyncMessageVersion)
+
+	for account, version := range toconvert {
+		toret[account] = SyncMessageVersionFromConfig(&version)
+	}
+	return toret
+}
+
+// return highest common sync message version, or Default (which is always available)
+func HighestCommonSyncMessageVersion(a SyncMessageVersion, b SyncMessageVersion) SyncMessageVersion {
+	if a > b {
+		return b
+	}
+	return a
+}

shared/management/grpc/sync_message_versions_test.go

@@ -0,0 +1,39 @@
+package grpc
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidation(t *testing.T) {
+	assert.NoError(t, ValidateSyncMessageVersion(nil))
+	assert.NoError(t, ValidateSyncMessageVersion(toIntPtr(0)))
+	assert.NoError(t, ValidateSyncMessageVersion(toIntPtr(1)))
+	assert.ErrorIs(t, ValidateSyncMessageVersion(toIntPtr(int(^uint(0)>>1))), ErrorUnrecognizedSyncMessageVersion)
+	assert.ErrorIs(t, ValidateSyncMessageVersion(toIntPtr(-1)), ErrorUnrecognizedSyncMessageVersion)
+}
+
+func TestVersionFromConfig(t *testing.T) {
+	assert.Equal(t, DefaultSyncMessageVersion, SyncMessageVersionFromConfig(nil))
+	assert.Equal(t, Base, SyncMessageVersionFromConfig(toIntPtr(0)))
+	assert.Equal(t, ComponentNetworkMap, SyncMessageVersionFromConfig(toIntPtr(1)))
+	assert.Equal(t, DefaultSyncMessageVersion, SyncMessageVersionFromConfig(toIntPtr(-1)))
+	assert.Equal(t, DefaultSyncMessageVersion, SyncMessageVersionFromConfig(toIntPtr(int(^uint(0)>>1))))
+}
+
+func TestPerAccountConversionStringToEnum(t *testing.T) {
+	assert.Equal(t, map[string]SyncMessageVersion{"1": HighestSyncMessageVersion}, SyncMessageVersionsFromMap(map[string]int{"1": 1}))
+	assert.Equal(t, map[string]SyncMessageVersion{"2": DefaultSyncMessageVersion}, SyncMessageVersionsFromMap(map[string]int{"2": -1}))
+}
+
+func TestCommonVersions(t *testing.T) {
+	assert.Equal(t, Base, HighestCommonSyncMessageVersion(Base, HighestSyncMessageVersion))
+	assert.Equal(t, Base, HighestCommonSyncMessageVersion(HighestSyncMessageVersion, Base))
+	assert.Equal(t, Base, HighestCommonSyncMessageVersion(Base, Base))
+	assert.Equal(t, HighestSyncMessageVersion, HighestCommonSyncMessageVersion(HighestSyncMessageVersion, HighestSyncMessageVersion))
+}
+
+func toIntPtr(v int) *int {
+	return &v
+}