feat: chain-tip test program

.gitignore

@@ -9,6 +9,7 @@
 /block-fetch
 /peer-sharing
 /tx-submission
+/chain-tip
 
 # Test binary, built with `go test -c`
 *.test

cmd/chain-tip/main.go

@@ -0,0 +1,66 @@
+// Copyright 2023 Blink Labs, LLC.
+//
+// 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 main
+
+import (
+	"fmt"
+	"os"
+
+	ouroboros "github.com/blinklabs-io/gouroboros"
+	"github.com/blinklabs-io/gouroboros/cmd/common"
+)
+
+type txSubmissionFlags struct {
+	*common.GlobalFlags
+}
+
+func main() {
+	// Parse commandline
+	f := txSubmissionFlags{
+		GlobalFlags: common.NewGlobalFlags(),
+	}
+	f.Parse()
+	// Create connection
+	conn := common.CreateClientConnection(f.GlobalFlags)
+	errorChan := make(chan error)
+	go func() {
+		for {
+			err := <-errorChan
+			fmt.Printf("ERROR(async): %s\n", err)
+			os.Exit(1)
+		}
+	}()
+	o, err := ouroboros.New(
+		ouroboros.WithConnection(conn),
+		ouroboros.WithNetworkMagic(uint32(f.NetworkMagic)),
+		ouroboros.WithErrorChan(errorChan),
+		ouroboros.WithNodeToNode(f.NtnProto),
+		ouroboros.WithKeepAlive(true),
+	)
+	if err != nil {
+		fmt.Printf("ERROR: %s\n", err)
+		os.Exit(1)
+	}
+
+	tip, err := o.ChainSync().Client.GetCurrentTip()
+	if err != nil {
+		fmt.Printf("ERROR: %s\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Print("Current chain tip:\n\n")
+	fmt.Printf("Block hash: %x\n", tip.Point.Hash)
+	fmt.Printf("Slot number: %d\n", tip.Point.Slot)
+}