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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,4 @@ | ||
| bin/ | ||
| .idea/ | ||
| coverage.out | ||
| release |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/linuxsuren/transfer/pkg" | ||
| "github.com/spf13/cobra" | ||
| "time" | ||
| ) | ||
|
|
||
| func NewSendCmd() (cmd *cobra.Command) { | ||
| opt := &sendOption{} | ||
|
|
||
| cmd = &cobra.Command{ | ||
| Use: "send", | ||
| Short: "Send data with UDP protocol", | ||
| PreRunE: opt.preRunE, | ||
| RunE: opt.runE, | ||
| } | ||
| flags := cmd.Flags() | ||
| flags.IntVarP(&opt.port, "port", "p", 3000, "The port to send") | ||
| return | ||
| } | ||
|
|
||
| type sendOption struct { | ||
| ip string | ||
| port int | ||
| } | ||
|
|
||
| func (o *sendOption) preRunE(cmd *cobra.Command, args []string) (err error) { | ||
| if len(args) >= 2 { | ||
| o.ip = args[1] | ||
| return | ||
| } | ||
|
|
||
| cmd.Println("no target ip provided, trying to find it") | ||
|
|
||
| ctx, cancel := context.WithCancel(cmd.Context()) | ||
|
|
||
| waiter := make(chan string, 10) | ||
| pkg.FindWaiters(ctx, waiter) | ||
|
|
||
| o.ip = <-waiter | ||
| cancel() | ||
| return | ||
| } | ||
|
|
||
| func (o *sendOption) runE(cmd *cobra.Command, args []string) (err error) { | ||
| beginTime := time.Now() | ||
| if len(args) <= 0 { | ||
| cmd.PrintErrln("filename is required") | ||
| return | ||
| } | ||
|
|
||
| file := args[0] | ||
|
|
||
| sender := pkg.NewUDPSender(o.ip).WithPort(o.port) | ||
| msg := make(chan string, 10) | ||
|
|
||
| go func() { | ||
| for a := range msg { | ||
| cmd.Println(a) | ||
| } | ||
| }() | ||
|
|
||
| err = sender.Send(msg, file) | ||
| endTime := time.Now() | ||
| fmt.Printf("sent over with %f\n", endTime.Sub(beginTime).Seconds()) | ||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| package cmd | ||
|
|
||
| import ( | ||
| "github.com/linuxsuren/transfer/pkg" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| type waitOption struct { | ||
| port int | ||
| listen string | ||
| } | ||
|
|
||
| func (o *waitOption) preRunE(cmd *cobra.Command, _ []string) (err error) { | ||
| err = pkg.Broadcast(cmd.Context()) | ||
| return | ||
| } | ||
|
|
||
| func (o *waitOption) runE(cmd *cobra.Command, args []string) error { | ||
| waiter := pkg.NewUDPWaiter(o.port).ListenAddress(o.listen) | ||
| msg := make(chan string, 10) | ||
|
|
||
| go func() { | ||
| for a := range msg { | ||
| cmd.Println(a) | ||
| } | ||
| }() | ||
| return waiter.Start(msg) | ||
| } | ||
|
|
||
| func NewWaitCmd() (cmd *cobra.Command) { | ||
| opt := &waitOption{} | ||
| cmd = &cobra.Command{ | ||
| Use: "wait", | ||
| Short: "Wait the data from a UDP protocol", | ||
| PreRunE: opt.preRunE, | ||
| RunE: opt.runE, | ||
| } | ||
| flags := cmd.Flags() | ||
| flags.IntVarP(&opt.port, "port", "p", 3000, "The port to listen") | ||
| flags.StringVarP(&opt.listen, "listen", "l", "0.0.0.0", "The address that want to listen") | ||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package pkg | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "time" | ||
| ) | ||
|
|
||
| // Broadcast sends the broadcast message to all the potential ip addresses | ||
| func Broadcast(ctx context.Context) (err error) { | ||
| var ifaces []net.Interface | ||
| if ifaces, err = net.Interfaces(); err != nil { | ||
| return | ||
| } | ||
|
|
||
| var addrs []net.Addr | ||
| var allIPs []net.IP | ||
| for _, i := range ifaces { | ||
| if addrs, err = i.Addrs(); err != nil { | ||
| continue | ||
| } | ||
|
|
||
| for _, addr := range addrs { | ||
| var ip net.IP | ||
| switch v := addr.(type) { | ||
| case *net.IPNet: | ||
| ip = v.IP | ||
| } | ||
|
|
||
| if ip == nil || ip.IsLinkLocalUnicast() || ip.IsLoopback() || ip.To4() == nil { | ||
| continue | ||
| } | ||
|
|
||
| allIPs = append(allIPs, ip) | ||
| } | ||
| } | ||
|
|
||
| for _, ip := range allIPs { | ||
| go func(ctx context.Context, ip net.IP) { | ||
| broadcast(ctx, ip) | ||
| }(ctx, ip) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func broadcast(ctx context.Context, ip net.IP) { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-time.After(3 * time.Second): | ||
| ip.To4()[3] = 255 | ||
| srcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0} | ||
| dstAddr := &net.UDPAddr{IP: ip, Port: 9981} | ||
| conn, err := net.ListenUDP("udp", srcAddr) | ||
| if err != nil { | ||
| return | ||
| } | ||
| _, _ = conn.WriteToUDP([]byte("hello"), dstAddr) | ||
| } | ||
| } | ||
| } |
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