https://pkg.go.dev/github.com/jtolio/crawlspace
package crawlspace provides a means to dynamically interact with registered Go objects in a live process, using small scripting language based around the reflect package.
Inspiration is mainly from Twisted's manhole library: https://twistedmatrix.com/documents/current/api/twisted.conch.manhole.html
Example usage:
package main
import (
"github.com/jtolds/crawlspace"
)
type MyType struct{ x int }
func (m *MyType) Set(x int) { m.x = x }
func (m *MyType) Get() int { return m.x }
func main() {
space := crawlspace.New(nil)
space.RegisterVal("x", &MyType{})
panic(crawlspace.ListenAndServe("localhost:2222"))
}
After running the above program, you can now connect via telnet or netcat to localhost:2222, and run the following interaction:
> x.Get()
0
> x.Set(5)
> x.Get()
5
If you import the github.com/jtolds/crawlspace/tools package, you can have an
extremely powerful experience that doesn't require type registration, driven by
https://github.com/zeebo/goof.
space := crawlspace.New(tools.Env)
And here's an example history inspecting a process:
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
github.com/jtolio/[email protected]
github.com/jtolio/crawlspace-test@(devel)
> import "net"
> import "reflect"
> import "unsafe"
> conn := reflect.NewAt(net.conn, unsafe.Pointer(uintptr(0xc00028e038))).Interface()
> dir(conn)
[]string{"Close", "File", "LocalAddr", "Read", "RemoteAddr", "SetDeadline", "SetReadBuffer", "SetReadDeadline", "SetWriteBuffer", "SetWriteDeadline", "Write", "fd"}
> addr := conn.RemoteAddr()
> addr.String()
"127.0.0.1:43868"
> dir(addr)
[]string{"AddrPort", "IP", "Network", "Port", "String", "Zone"}
> ips, err := net.LookupIP("google.com")
> err
nil
> ips[1].String()
"172.217.2.46"
>
Copyright 2015-2023, JT Olds. Licensed under Apache License 2.0