test: blockfetch client tests (#568)

Fixes #319

protocol/blockfetch/client_test.go

@@ -0,0 +1,193 @@
+// 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 blockfetch_test
+
+import (
+	"fmt"
+	"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/blockfetch"
+	ocommon "github.com/blinklabs-io/gouroboros/protocol/common"
+	ouroboros_mock "github.com/blinklabs-io/ouroboros-mock"
+	"go.uber.org/goleak"
+)
+
+var conversationHandshakeRequestRange = []ouroboros_mock.ConversationEntry{
+	ouroboros_mock.ConversationEntryHandshakeRequestGeneric,
+	ouroboros_mock.ConversationEntryHandshakeNtNResponse,
+	ouroboros_mock.ConversationEntryInput{
+		ProtocolId:  blockfetch.ProtocolId,
+		MessageType: blockfetch.MessageTypeRequestRange,
+	},
+}
+
+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),
+		ouroboros.WithNodeToNode(true),
+	)
+	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 TestGetBlock(t *testing.T) {
+	var testBlockSlot uint64 = 23456
+	var testBlockNumber uint64 = 12345
+	// 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 = testBlockNumber
+	testBlock.Header.Body.Slot = testBlockSlot
+	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)
+	}
+	testBlockHash := test.DecodeHexString(testBlock.Hash())
+	wrappedBlock := blockfetch.WrappedBlock{
+		Type:     ledger.BlockTypeBabbage,
+		RawBlock: cbor.RawMessage(blockCbor),
+	}
+	wrappedBlockCbor, err := cbor.Encode(wrappedBlock)
+	if err != nil {
+		t.Fatalf("received unexpected error: %s", err)
+	}
+	conversation := append(
+		conversationHandshakeRequestRange,
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: blockfetch.ProtocolId,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				blockfetch.NewMsgStartBatch(),
+				blockfetch.NewMsgBlock(
+					wrappedBlockCbor,
+				),
+				blockfetch.NewMsgBatchDone(),
+			},
+		},
+	)
+	runTest(
+		t,
+		conversation,
+		func(t *testing.T, oConn *ouroboros.Connection) {
+			blk, err := oConn.BlockFetch().Client.GetBlock(
+				ocommon.NewPoint(
+					testBlockSlot,
+					testBlockHash,
+				),
+			)
+			if err != nil {
+				t.Fatalf("received unexpected error: %s", err)
+			}
+			if blk.Hash() != testBlock.Hash() {
+				t.Fatalf("did not receive expected block hash: got %s, wanted %s", blk.Hash(), testBlock.Hash())
+			}
+			if blk.SlotNumber() != testBlockSlot {
+				t.Fatalf("did not receive expected block slot: got %d, wanted %d", blk.SlotNumber(), testBlockSlot)
+			}
+		},
+	)
+}
+
+func TestGetBlockNoBlocks(t *testing.T) {
+	conversation := append(
+		conversationHandshakeRequestRange,
+		ouroboros_mock.ConversationEntryOutput{
+			ProtocolId: blockfetch.ProtocolId,
+			IsResponse: true,
+			Messages: []protocol.Message{
+				blockfetch.NewMsgNoBlocks(),
+			},
+		},
+	)
+	expectedErr := `block(s) not found`
+	runTest(
+		t,
+		conversation,
+		func(t *testing.T, oConn *ouroboros.Connection) {
+			_, err := oConn.BlockFetch().Client.GetBlock(
+				ocommon.NewPoint(
+					12345,
+					test.DecodeHexString("abcdef0123456789"),
+				),
+			)
+			if err == nil {
+				t.Fatalf("did not receive expected error")
+			}
+			if err.Error() != expectedErr {
+				t.Fatalf("did not receive expected error\n  got:    %s\n  wanted: %s", err, expectedErr)
+			}
+		},
+	)
+}