github.com/lbryio/lbcd@v0.22.119/rpcclient/examples/btcdwebsockets/main.go (about)

     1  // Copyright (c) 2014-2017 The btcsuite developers
     2  // Use of this source code is governed by an ISC
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"io/ioutil"
     9  	"log"
    10  	"path/filepath"
    11  	"time"
    12  
    13  	"github.com/lbryio/lbcd/rpcclient"
    14  	"github.com/lbryio/lbcd/wire"
    15  	btcutil "github.com/lbryio/lbcutil"
    16  )
    17  
    18  func main() {
    19  	// Only override the handlers for notifications you care about.
    20  	// Also note most of these handlers will only be called if you register
    21  	// for notifications.  See the documentation of the rpcclient
    22  	// NotificationHandlers type for more details about each handler.
    23  	ntfnHandlers := rpcclient.NotificationHandlers{
    24  		OnFilteredBlockConnected: func(height int32, header *wire.BlockHeader, txns []*btcutil.Tx) {
    25  			log.Printf("Block connected: %v (%d) %v",
    26  				header.BlockHash(), height, header.Timestamp)
    27  		},
    28  		OnFilteredBlockDisconnected: func(height int32, header *wire.BlockHeader) {
    29  			log.Printf("Block disconnected: %v (%d) %v",
    30  				header.BlockHash(), height, header.Timestamp)
    31  		},
    32  	}
    33  
    34  	// Connect to local btcd RPC server using websockets.
    35  	btcdHomeDir := btcutil.AppDataDir("lbcd", false)
    36  	certs, err := ioutil.ReadFile(filepath.Join(btcdHomeDir, "rpc.cert"))
    37  	if err != nil {
    38  		log.Fatal(err)
    39  	}
    40  	connCfg := &rpcclient.ConnConfig{
    41  		Host:         "localhost:9245",
    42  		Endpoint:     "ws",
    43  		User:         "yourrpcuser",
    44  		Pass:         "yourrpcpass",
    45  		Certificates: certs,
    46  	}
    47  	client, err := rpcclient.New(connCfg, &ntfnHandlers)
    48  	if err != nil {
    49  		log.Fatal(err)
    50  	}
    51  
    52  	// Register for block connect and disconnect notifications.
    53  	if err := client.NotifyBlocks(); err != nil {
    54  		log.Fatal(err)
    55  	}
    56  	log.Println("NotifyBlocks: Registration Complete")
    57  
    58  	// Get the current block count.
    59  	blockCount, err := client.GetBlockCount()
    60  	if err != nil {
    61  		log.Fatal(err)
    62  	}
    63  	log.Printf("Block count: %d", blockCount)
    64  
    65  	// For this example gracefully shutdown the client after 10 seconds.
    66  	// Ordinarily when to shutdown the client is highly application
    67  	// specific.
    68  	log.Println("Client shutdown in 10 seconds...")
    69  	time.AfterFunc(time.Second*10, func() {
    70  		log.Println("Client shutting down...")
    71  		client.Shutdown()
    72  		log.Println("Client shutdown complete.")
    73  	})
    74  
    75  	// Wait until the client either shuts down gracefully (or the user
    76  	// terminates the process with Ctrl+C).
    77  	client.WaitForShutdown()
    78  }