You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: proc_fops_hooking.go
    path of file: ./repos/tracee/signatures/golang
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"

	"github.com/aquasecurity/tracee/signatures/helpers"
	"github.com/aquasecurity/tracee/types/detect"
	"github.com/aquasecurity/tracee/types/protocol"
	"github.com/aquasecurity/tracee/types/trace"
)

type ProcFopsHooking struct {
	cb detect.SignatureHandler
}

func (sig *ProcFopsHooking) Init(ctx detect.SignatureContext) error {
	sig.cb = ctx.Callback
	return nil
}

func (sig *ProcFopsHooking) GetMetadata() (detect.SignatureMetadata, error) {
	return detect.SignatureMetadata{
		ID:          "TRC-1020",
		Version:     "1",
		Name:        "File operations hooking on proc filesystem detected",
		EventName:   "proc_fops_hooking",
		Description: "File operations hooking on proc filesystem detected. The proc filesystem is an interface for the running processes as files. This allows programs like `ps` and `top` to check what are the running processes. File operations are the functions defined on a file or directory. File operations hooking includes replacing the default function used to perform a basic task on files and directories like enumerating files. By hooking the file operations of /proc an adversary gains control on certain system function, such as file list
    
func (sig *ProcFopsHooking) GetMetadata() (detect.SignatureMetadata, error) {
	return detect.SignatureMetadata{
		ID:          "TRC-1020",
		Version:     "1",
		Name:        "File operations hooking on proc filesystem detected",
		EventName:   "proc_fops_hooking",
		Description: "File operations hooking on proc filesystem detected. The proc filesystem is an interface for the running processes as files. This allows programs like `ps` and `top` to check what are the running processes. File operations are the functions defined on a file or directory. File operations hooking includes replacing the default function used to perform a basic task on files and directories like enumerating files. By hooking the file operations of /proc an adversary gains control on certain system function, such as file listing or other basic function performed by the operation system. The adversary may also hijack the execution flow and execute it's own code. File operation hooking is considered a malicious behavior that is performed by rootkits and may indicate that the host's kernel has been compromised. Hidden modules are marked as hidden symbol owners and indicate further malicious activity of an adversary.",
		Properties: map[string]interface{}{
			"Severity":             3,
			"Category":             "defense-evasion",
			"Technique":            "Rootkit",
			"Kubernetes_Technique": "",
			"id":                   "attack-pattern--0f20e3cb-245b-4a61-8a91-2d93f7cb0e9b",
			"external_id":          "T1014",
		},
	}, nil
}