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main.go
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main.go
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// Copyright (c) 2014-2015 The btcsuite developers
// Copyright (c) 2015-2021 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"context"
"log"
"os"
"path/filepath"
"time"
"github.com/decred/dcrd/dcrutil/v4"
"github.com/decred/dcrd/rpcclient/v7"
)
func main() {
// Only override the handlers for notifications you care about.
// Also note most of these handlers will only be called if you register
// for notifications. See the documentation of the rpcclient.
// NotificationHandlers type for more details about each handler.
ntfnHandlers := rpcclient.NotificationHandlers{
OnBlockConnected: func(blockHeader []byte, transactions [][]byte) {
log.Printf("Block connected: %v %v", blockHeader, transactions)
},
OnBlockDisconnected: func(blockHeader []byte) {
log.Printf("Block disconnected: %v", blockHeader)
},
}
// Connect to local dcrd RPC server using websockets.
dcrdHomeDir := dcrutil.AppDataDir("dcrd", false)
certs, err := os.ReadFile(filepath.Join(dcrdHomeDir, "rpc.cert"))
if err != nil {
log.Fatal(err)
}
connCfg := &rpcclient.ConnConfig{
Host: "localhost:9109",
Endpoint: "ws",
User: "yourrpcuser",
Pass: "yourrpcpass",
Certificates: certs,
}
client, err := rpcclient.New(connCfg, &ntfnHandlers)
if err != nil {
log.Fatal(err)
}
// Register for block connect and disconnect notifications.
ctx := context.Background()
if err := client.NotifyBlocks(ctx); err != nil {
log.Fatal(err)
}
log.Println("NotifyBlocks: Registration Complete")
// Get the current block count.
blockCount, err := client.GetBlockCount(ctx)
if err != nil {
log.Fatal(err)
}
log.Printf("Block count: %d", blockCount)
// For this example gracefully shutdown the client after 10 seconds.
// Ordinarily when to shutdown the client is highly application
// specific.
log.Println("Client shutdown in 10 seconds...")
time.AfterFunc(time.Second*10, func() {
log.Println("Client shutting down...")
client.Shutdown()
log.Println("Client shutdown complete.")
})
// Wait until the client either shuts down gracefully (or the user
// terminates the process with Ctrl+C).
client.WaitForShutdown()
}