Add GetVPNPeers pubapi endpoint

Signed-off-by: Malte Poll <mp@edgeless.systems>

coordinator/pubapi/vpn_test.go

@@ -0,0 +1,57 @@
+package pubapi
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/edgelesssys/constellation/coordinator/peer"
+	"github.com/edgelesssys/constellation/coordinator/pubapi/pubproto"
+	"github.com/edgelesssys/constellation/coordinator/role"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+)
+
+func TestGetVPNPeers(t *testing.T) {
+	wantedPeers := []peer.Peer{
+		{
+			PublicIP:  "192.0.2.1",
+			VPNIP:     "10.118.0.1",
+			VPNPubKey: []byte{0x1, 0x2, 0x3},
+			Role:      role.Coordinator,
+		},
+	}
+
+	testCases := map[string]struct {
+		coreGetPeersErr error
+		wantErr         bool
+	}{
+		"GetVPNPeers works": {},
+		"GetVPNPeers fails if core cannot retrieve VPN peers": {
+			coreGetPeersErr: errors.New("failed to get peers"),
+			wantErr:         true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+			require := require.New(t)
+
+			logger := zaptest.NewLogger(t)
+			cor := &fakeCore{peers: wantedPeers, GetPeersErr: tc.coreGetPeersErr}
+			api := New(logger, cor, nil, nil, nil, nil)
+			defer api.Close()
+			resp, err := api.GetVPNPeers(context.Background(), &pubproto.GetVPNPeersRequest{})
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+			require.NoError(err)
+
+			peers := peer.FromPubProto(resp.Peers)
+			assert.Equal(wantedPeers, peers)
+		})
+	}
+}