英文:
Undefined: ctx was encountered while running go libp2p
问题
以下是代码的中文翻译：
// 如果在命令行中传递了远程对等点，连接到它并发送5个ping消息，否则等待停止信号
if len(os.Args) > 1 {
addr, err := multiaddr.NewMultiaddr(os.Args[1])
if err != nil {
panic(err)
}
peer, err := peerstore.AddrInfoFromP2pAddr(addr)
if err != nil {
panic(err)
}
if err := node.Connect(ctx, *peer); err != nil {
panic(err)
}
fmt.Println("发送5个ping消息到", addr)
}
导入的包如下：
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/libp2p/go-libp2p"
peerstore "github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p/p2p/protocol/ping"
multiaddr "github.com/multiformats/go-multiaddr"
)
希望对你有帮助！如果还有其他问题，请随时提问。
英文:
The code is following,it is the an offical demo of go-libp2p.And I didn't encounter any other references or undefined errors
// if a remote peer has been passed on the command line, connect to it
// and send it 5 ping messages, otherwise wait for a signal to stop
if len(os.Args) > 1 {
addr, err := multiaddr.NewMultiaddr(os.Args[1])
if err != nil {
panic(err)
}
peer, err := peerstore.AddrInfoFromP2pAddr(addr)
if err != nil {
panic(err)
}
if err := node.Connect(ctx, *peer); err != nil {
panic(err)
}
fmt.Println("sending 5 ping messages to", addr)
The import is following:
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/libp2p/go-libp2p"
peerstore "github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p/p2p/protocol/ping"
multiaddr "github.com/multiformats/go-multiaddr"
)
答案1
得分: 1
看起来你正在按照"入门教程"进行操作。在你的问题代码块之前，你需要导入context并创建一个上下文：
// 创建上下文
ctx := context.Background()
// 如果在命令行中传递了远程对等点，请连接到它并发送5个ping消息，否则等待停止信号
if len(os.Args) > 1 {
addr, err := multiaddr.NewMultiaddr(os.Args[1])
if err != nil {
panic(err)
}
peer, err := peerstore.AddrInfoFromP2pAddr(addr)
if err != nil {
panic(err)
}
if err := node.Connect(ctx, *peer); err != nil {
panic(err)
}
fmt.Println("发送5个ping消息到", addr)
}
英文:
Looks like you are following the "Getting Started" tutorial.
You'll need to import context and prior to the code block in your question, you'll need to create a context:
// create context
ctx:=context.Background()
// if a remote peer has been passed on the command line, connect to it
// and send it 5 ping messages, otherwise wait for a signal to stop
if len(os.Args) > 1 {
addr, err := multiaddr.NewMultiaddr(os.Args[1])
if err != nil {
panic(err)
}
peer, err := peerstore.AddrInfoFromP2pAddr(addr)
if err != nil {
panic(err)
}
if err := node.Connect(ctx, *peer); err != nil {
panic(err)
}
fmt.Println("sending 5 ping messages to", addr)
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