test: chainsync client tests (#565)

Fixes #318

protocol/chainsync/client_test.go

@@ -0,0 +1,249 @@
+// Copyright 2024 Blink Labs Software
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package chainsync_test
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+	"time"
+
+	ouroboros "github.com/blinklabs-io/gouroboros"
+	"github.com/blinklabs-io/gouroboros/cbor"
+	"github.com/blinklabs-io/gouroboros/internal/test"
+	"github.com/blinklabs-io/gouroboros/ledger"
+	"github.com/blinklabs-io/gouroboros/protocol"
+	"github.com/blinklabs-io/gouroboros/protocol/chainsync"
+	ocommon "github.com/blinklabs-io/gouroboros/protocol/common"
+
+	ouroboros_mock "github.com/blinklabs-io/ouroboros-mock"
+	"go.uber.org/goleak"
+)
+
+var conversationHandshakeFindIntersect = []ouroboros_mock.ConversationEntry{
+	ouroboros_mock.ConversationEntryHandshakeRequestGeneric,
+	ouroboros_mock.ConversationEntryHandshakeNtCResponse,
+	ouroboros_mock.ConversationEntryInput{
+		ProtocolId:  chainsync.ProtocolIdNtC,
+		MessageType: chainsync.MessageTypeFindIntersect,
+	},
+}
+
+type testInnerFunc func(*testing.T, *ouroboros.Connection)
+
+func runTest(t *testing.T, conversation []ouroboros_mock.ConversationEntry, innerFunc testInnerFunc) {
+	defer goleak.VerifyNone(t)
+	mockConn := ouroboros_mock.NewConnection(
+		ouroboros_mock.ProtocolRoleClient,
+		conversation,
+	)
+	// Async mock connection error handler
+	asyncErrChan := make(chan error, 1)
+	go func() {
+		err := <-mockConn.(*ouroboros_mock.Connection).ErrorChan()
+		if err != nil {
+			asyncErrChan <- fmt.Errorf("received unexpected error: %s", err)
+		}
+		close(asyncErrChan)
+	}()
+	oConn, err := ouroboros.New(
+		ouroboros.WithConnection(mockConn),
+		ouroboros.WithNetworkMagic(ouroboros_mock.MockNetworkMagic),
+	)
+	if err != nil {
+		t.Fatalf("unexpected error when creating Ouroboros object: %s", err)
+	}
+	// Async error handler
+	go func() {
+		err, ok := <-oConn.ErrorChan()
+		if !ok {
+			return
+		}
+		// We can't call t.Fatalf() from a different Goroutine, so we panic instead
+		panic(fmt.Sprintf("unexpected Ouroboros error: %s", err))
+	}()
+	// Run test inner function
+	innerFunc(t, oConn)
+	// Wait for mock connection shutdown
+	select {
+	case err, ok := <-asyncErrChan:
+		if ok {
+			t.Fatal(err.Error())
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatalf("did not complete within timeout")
+	}
+	// Close Ouroboros connection
+	if err := oConn.Close(); err != nil {
+		t.Fatalf("unexpected error when closing Ouroboros object: %s", err)
+	}
+	// Wait for connection shutdown
+	select {
+	case <-oConn.ErrorChan():
+	case <-time.After(10 * time.Second):
+		t.Errorf("did not shutdown within timeout")
+	}
+}
+
+func TestIntersectNotFound(t *testing.T) {
+	conversation := append(
+		conversationHandshakeFindIntersect,
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: chainsync.ProtocolIdNtC,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				chainsync.NewMsgIntersectNotFound(
+					chainsync.Tip{
+						// NOTE: these values don't matter
+						BlockNumber: 12345,
+						Point:       ocommon.NewPointOrigin(),
+					},
+				),
+			},
+		},
+	)
+	runTest(
+		t,
+		conversation,
+		func(t *testing.T, oConn *ouroboros.Connection) {
+			// Start sync with "bad" intersect points
+			err := oConn.ChainSync().Client.Sync([]ocommon.Point{})
+			if err == nil {
+				t.Fatalf("did not receive expected error")
+			}
+			if err != chainsync.IntersectNotFoundError {
+				t.Fatalf("did not receive expected error\n  got:    %s\n  wanted: %s", err, chainsync.IntersectNotFoundError)
+			}
+		},
+	)
+}
+
+func TestGetCurrentTip(t *testing.T) {
+	expectedTip := chainsync.Tip{
+		BlockNumber: 12345,
+		Point: ocommon.NewPoint(
+			23456,
+			test.DecodeHexString("0123456789abcdef"),
+		),
+	}
+	conversation := append(
+		conversationHandshakeFindIntersect,
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: chainsync.ProtocolIdNtC,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				chainsync.NewMsgIntersectNotFound(expectedTip),
+			},
+		},
+	)
+	runTest(
+		t,
+		conversation,
+		func(t *testing.T, oConn *ouroboros.Connection) {
+			tip, err := oConn.ChainSync().Client.GetCurrentTip()
+			if err != nil {
+				t.Fatalf("received unexpected error: %s", err)
+			}
+			if !reflect.DeepEqual(tip, &expectedTip) {
+				t.Fatalf("did not receive expected tip\n  got:    %#v\n  wanted: %#v", tip, expectedTip)
+			}
+		},
+	)
+}
+
+func TestGetAvailableBlockRange(t *testing.T) {
+	expectedIntersect := ocommon.NewPoint(
+		20001,
+		test.DecodeHexString("123456789abcdef0"),
+	)
+	expectedTip := chainsync.Tip{
+		BlockNumber: 12345,
+		Point: ocommon.NewPoint(
+			23456,
+			test.DecodeHexString("0123456789abcdef"),
+		),
+	}
+	// Create basic block and round-trip it through the CBOR encoder to get the hash populated
+	// The slot value is one higher than our intersect point and the block height is less than
+	// our expected tip
+	testBlock := ledger.BabbageBlock{
+		Header: &ledger.BabbageBlockHeader{},
+	}
+	testBlock.Header.Body.BlockNumber = 12001
+	testBlock.Header.Body.Slot = 20002
+	blockCbor, err := cbor.Encode(testBlock)
+	if err != nil {
+		t.Fatalf("received unexpected error: %s", err)
+	}
+	if _, err := cbor.Decode(blockCbor, &testBlock); err != nil {
+		t.Fatalf("received unexpected error: %s", err)
+	}
+	expectedStart := ocommon.NewPoint(
+		testBlock.SlotNumber(),
+		test.DecodeHexString(testBlock.Hash()),
+	)
+	conversation := append(
+		conversationHandshakeFindIntersect,
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: chainsync.ProtocolIdNtC,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				chainsync.NewMsgIntersectFound(expectedIntersect, expectedTip),
+			},
+		},
+		ouroboros_mock.ConversationEntryInput{
+			ProtocolId:  chainsync.ProtocolIdNtC,
+			MessageType: chainsync.MessageTypeRequestNext,
+		},
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: chainsync.ProtocolIdNtC,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				chainsync.NewMsgRollBackward(expectedIntersect, expectedTip),
+			},
+		},
+		ouroboros_mock.ConversationEntryInput{
+			ProtocolId:  chainsync.ProtocolIdNtC,
+			MessageType: chainsync.MessageTypeRequestNext,
+		},
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: chainsync.ProtocolIdNtC,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				chainsync.NewMsgRollForwardNtC(
+					ledger.BlockTypeBabbage,
+					blockCbor,
+					expectedTip,
+				),
+			},
+		},
+	)
+	runTest(
+		t,
+		conversation,
+		func(t *testing.T, oConn *ouroboros.Connection) {
+			start, end, err := oConn.ChainSync().Client.GetAvailableBlockRange([]ocommon.Point{expectedIntersect})
+			if err != nil {
+				t.Fatalf("received unexpected error: %s", err)
+			}
+			if !reflect.DeepEqual(start, expectedStart) {
+				t.Fatalf("did not receive expected start point\n  got:    %#v\n  wanted: %#v", start, expectedStart)
+			}
+			if !reflect.DeepEqual(end, expectedTip.Point) {
+				t.Fatalf("did not receive expected end point\n  got:    %#v\n  wanted: %#v", end, expectedTip.Point)
+			}
+		},
+	)
+}