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Adding [slightly better] socket support.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| package socket | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/strategicpause/memory-leak/metrics" | ||
| "golang.org/x/sys/unix" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| // MaxConnections defines the maximum number of connections that can be accepted by a given socket. This value is | ||
| // defined by /proc/sys/net/core/somaxconn. | ||
| MaxConnections = 4096 | ||
| StartPort = 9090 | ||
| // By default each established socket connection will write 1 KiB to the buffer. | ||
| KiB = 1024 | ||
| ) | ||
|
|
||
| var ( | ||
| LocalAddr = [4]byte{127, 0, 0, 1} | ||
| ) | ||
|
|
||
| type Params struct { | ||
| NumSockets int64 | ||
| NetworkAddressDomain int | ||
| ConnectionType int | ||
| CommunicationProtocol int | ||
| PauseTimeInSeconds time.Duration | ||
| } | ||
|
|
||
| func tcpLeak(params *Params) error { | ||
| PrintParams(params) | ||
|
|
||
| var stopChan chan bool | ||
| var err error | ||
|
|
||
| nextPort := StartPort | ||
| currentPort := nextPort | ||
|
|
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| for i := int64(0); i < params.NumSockets; i++ { | ||
| // Setup a new service every 4096 connections. | ||
| if i%MaxConnections == 0 { | ||
| if stopChan != nil { | ||
| stopChan <- true | ||
| } | ||
| currentPort = nextPort | ||
| stopChan, err = resetServer(params, currentPort) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| nextPort = nextPort + 1 | ||
| } | ||
|
|
||
| clientFd, err := unix.Socket(params.NetworkAddressDomain, params.ConnectionType, params.CommunicationProtocol) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err = unix.Connect(clientFd, &unix.SockaddrInet4{Port: currentPort, Addr: LocalAddr}); err != nil { | ||
| return err | ||
| } | ||
|
|
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| _, err = unix.Write(clientFd, make([]byte, KiB)) | ||
|
|
||
| if i%100 == 0 { | ||
| metrics.PrintSocketStats() | ||
| time.Sleep(params.PauseTimeInSeconds) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // resetServer will create a new service socket after 4096 connections (which is the maximum backlog value for listen). | ||
| func resetServer(params *Params, port int) (chan bool, error) { | ||
| stopChan := make(chan bool, 1) | ||
| serverFd := Must(unix.Socket(params.NetworkAddressDomain, params.ConnectionType, params.CommunicationProtocol)) | ||
|
|
||
| serviceAddr := &unix.SockaddrInet4{ | ||
| Port: port, | ||
| Addr: LocalAddr, | ||
| } | ||
|
|
||
| if err := unix.Bind(serverFd, serviceAddr); err != nil { | ||
| return stopChan, err | ||
| } | ||
|
|
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| if err := unix.Listen(serverFd, MaxConnections); err != nil { | ||
| return stopChan, err | ||
| } | ||
| fmt.Printf("Service bound to 127.0.0.1:%d.\n", port) | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case <-stopChan: | ||
| unix.Close(serverFd) | ||
| return | ||
| default: | ||
| unix.Accept(serverFd) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return stopChan, nil | ||
| } | ||
|
|
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| func PrintParams(params *Params) { | ||
| fmt.Printf("NumSockets: %v\n", params.NumSockets) | ||
| } | ||
|
|
||
| func Must[T any](obj T, err error) T { | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return obj | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package socket | ||
|
|
||
| import ( | ||
| "github.com/urfave/cli" | ||
| "golang.org/x/sys/unix" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| NumSocketsName = "num-sockets" | ||
| CommunicationProtocolName = "comm-protocol" | ||
| PauseDurationName = "pause" | ||
| ) | ||
|
|
||
| func Register() cli.Command { | ||
| return cli.Command{ | ||
| Name: "socket", | ||
| Usage: "Reproduces a socket leak.", | ||
| Action: action, | ||
| Flags: flags(), | ||
| } | ||
| } | ||
|
|
||
| func flags() []cli.Flag { | ||
| return []cli.Flag{ | ||
| cli.Int64Flag{ | ||
| Name: NumSocketsName, | ||
| Usage: "specify the number of sockets to create.", | ||
| Value: 9223372036854775807, | ||
| }, | ||
| cli.DurationFlag{ | ||
| Name: PauseDurationName, | ||
| Usage: "Time between allocations in seconds.", | ||
| Value: time.Second, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func action(ctx *cli.Context) error { | ||
| params := &Params{ | ||
| NumSockets: ctx.Int64(NumSocketsName), | ||
| NetworkAddressDomain: unix.AF_INET, | ||
| ConnectionType: unix.SOCK_STREAM, | ||
| CommunicationProtocol: unix.IPPROTO_TCP, | ||
| PauseTimeInSeconds: ctx.Duration(PauseDurationName), | ||
| } | ||
| return tcpLeak(params) | ||
| } |
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