Lua bindings for client side minetest protocol – written in Go, using anon5’s mt package. Capable of deserializing ToClt packets and serializing ToSrv packets.

Main use case are bot clients. Multiple clients can easily be spawend and polled from one script – hence the name “Hydra”. Hydra may also be useful for integration testing or network debugging.

Hydra is WIP: there are bugs, API may change any time, some packets are unimplemented and many components are yet to be added.


Go 1.18 is required. go install github.com/dragonfireclient/[email protected]


Due to limitations of Go, hydra can not simply be required from a Lua script. Instead, the hydra binary has to be invoked with a script as argument: hydra-dragonfire file.lua <args>. Any additional arguments <args> are provided to the script.


By default, hydra will only take care of connection and packet serialization, no state management takes place. Hydra is a library, not a framework: it does not organize your code and there is no module system.

Multiple clients can be created independently by calling the hydra.client function. poll can be used on one or multiple clients to receive packets and send can be used to send packets. Only selected packets will be returned by poll, to avoid unnecessary conversion of packets to Lua. Poll will return early if the script is interrupted by a signal, one of the selected clients is disconnected or the configured timeout elapses.

Additionally, different native components can be enabled per-client to manage state. Currently only the auth component is available, but components like map, objs, inv, pos, playerlist etc. will be added in the future. Components handle packets asynchronously, they will process them even if poll is not called.


For available packets, see spec/client and spec/server.

For available utilities, see builtin.

Documentation for native functions is yet TODO.


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