Srlion's Hook Library

This is a simple^{rip 2020~2021} fat, realible, fast and optimized hook library for Garry's Mod. It's well tested and will not mess anything when added to your server. It will improve your server performance.

Thanks to Meepen for his hook library because im using some ideas from it and inspired me to make this <3

Ulx support!

Now you can just drop it in your server and will replace ULib's hook library! But you will have to watch for warnings that could appear if an addon tries to modify hook.GetULibTable directly to fix it. Otherwise it's just drop in replacement.

Steam Workhop

Latest update is not on workshop yet, need to make sure that everything is working as intended to not kill lots of servers.

Installation

Add this in: addons/custom_hook/lua/includes/modules/hook.lua

Priorities

• PRE_HOOK
• PRE_HOOK_RETURN
• NORMAL_HOOK (Default)
• POST_HOOK_RETURN
• POST_HOOK

Usage

hook.Add(event_name, name, func, priority)

Examples

PRE_HOOK

This hook is guaranteed to be called under all circumstances, and cannot be interrupted by a return statement. You can rely on its consistent execution.

This primarily serves as a logging hook.

hook.Add("PlayerSay", "pre_player_say", function(sender, text)
    print(sender:Name() .. "is attempting to send a text: " .. text)
end, PRE_HOOK)

PRE_HOOK_RETURN

Consider a scenario where you have an admin mod that checks for "!menu". In this case, your hook might not be called before it. To ensure that your hook runs prior to this and is able to check for your command, you can utilize PRE_HOOK_RETURN.

hook.Add("PlayerSay", "pre_return_player_say", function(sender, text)
    if text == "!superpower" then
        sender:give_superpower()
        return ""
    end
end, PRE_HOOK_RETURN)

POST_HOOK_RETURN

This allows for the modification of results returned from preceding hooks!

-- arguments = {[1] = hook_name, [2] = returned_value_1, [3] = returned_value_2, ...etc}
-- hook_name can be the gamemode table that was passed to hook.Call
hook.Add("PlayerSay", "post_return_player_say", function(arguments, sender, text)
    local hook_name = arguments[1] -- This is the name of the hook that gave back a result.
    local returned_string = arguments[2]
    print(string.format("%s returned: %s, but we are changing it to : %s", hook_name, returned_string, "help"))
    return "help"
end, POST_HOOK_RETURN)

POST_HOOK

This hook is guaranteed to be called under all circumstances, and cannot be interrupted by a return statement. You can rely on its consistent execution.

Modifications made by POST_HOOK_RETURN will also modify the results in POST_HOOK

This primarily serves as a logging hook.

-- arguments = {[1] = hook_name, [2] = returned_value_1, [3] = returned_value_2, ...etc}
-- hook_name can be the gamemode table that was passed to hook.Call
hook.Add("PlayerSay", "post_player_say", function(arguments, sender, text)
    local hook_name = arguments[1] -- This is the name of the hook that gave back a result.
    local returned_string = arguments[2]
    print(string.format("%s said: %s", sender, text))
end, POST_HOOK)

Benchmarks

Using this simple hook caller to do C++ -> Lua hook.Call

Empty 500 Calls - jit.off() in lua/includes/init.lua

concommand.Add("hooktest", function()
    require("hooktest")

    for i = 1, 500 do
        hook.Add("HOOK_CALL_TEST", tostring(i), function(arg)
        end)
    end

    print("Number of hooks: " .. table.Count(hook.GetTable().HOOK_CALL_TEST))

    print("Warming up...")
    HOOK_CALL_TEST()

    local calls_sum = 0

    print("Starting hook bench test...")
    for i = 1, 6 do
        calls_sum = calls_sum + HOOK_CALL_TEST()
    end

    print("hook.Call average time: " .. math.Round(calls_sum / 6, 3) .. " seconds")
    print("~!")
end)

Srlion's hook.Call: 1.775 seconds
    Faster than ULX's hook by 56.90%
    Faster than Default's hook by 325.58%
    Faster than DLib's hook by 597.46%

ULX's hook.Call: 2.785 seconds
    Faster than Default's hook by 171.24%
    Faster than DLib's hook by 344.52%

Default's hook.Call: 7.554 seconds
    Faster than DLib's hook by 63.89%

DLib's hook.Call: 12.380 seconds

CurTime() 250 Calls

concommand.Add("hooktest", function()
    require("hooktest")

    local CurTime = CurTime
    for i = 1, 250 do
        hook.Add("HOOK_CALL_TEST", tostring(i), function(arg)
            CurTime()
        end)
    end

    print("Number of hooks: " .. table.Count(hook.GetTable().HOOK_CALL_TEST))

    print("Warming up...")
    HOOK_CALL_TEST()

    local calls_sum = 0

    print("Starting hook bench test...")
    for i = 1, 6 do
        calls_sum = calls_sum + HOOK_CALL_TEST()
    end

    print("hook.Call average time: " .. math.Round(calls_sum / 6, 3) .. " seconds")
    print("~!")
end)

Srlion's hook.Call: 1.775 seconds
    Faster than ULX's hook by 21.86%
    Faster than Default's hook by 216.96%
    Faster than DLib's hook by 326.70%

ULX's hook.Call: 2.163 seconds
    Faster than Default's hook by 160.10%
    Faster than DLib's hook by 250.16%

Default's hook.Call: 5.626 seconds
    Faster than DLib's hook by 34.62%

DLib's hook.Call: 7.574 seconds

Hey, you're just boosting your server for free! No drawbacks, only extra goodies!

Tested On Physgun Dev Server

Gamemode: Sandbox

• Lua Refresh -> OFF
• Physgun Utils -> OFF