From f2cfeb844dcb50af374e87791188ef8bb56f4e81 Mon Sep 17 00:00:00 2001
From: Jakob Meier <comcloudway@ccw.icu>
Date: Sun, 26 Feb 2023 21:37:50 +0100
Subject: [PATCH] Started working on p2p Multiplayer

Known problem: The Map messages are not being received
(when map is to big)
---
 .build.yml               |    1 +
 Cargo.lock               | 3610 +++++++++++++++++++++++++++++++++++---
 Cargo.toml               |   11 +
 src/main.rs              |    3 +
 src/p2p.rs               |  446 +++++
 src/screens/build.rs     |  109 +-
 src/screens/inventory.rs |    8 +-
 src/screens/welcome.rs   |   30 +-
 src/types.rs             |    2 +-
 9 files changed, 3997 insertions(+), 223 deletions(-)
 create mode 100644 src/p2p.rs

diff --git a/.build.yml b/.build.yml
index d26f630..5b44430 100644
--- a/.build.yml
+++ b/.build.yml
@@ -6,6 +6,7 @@ packages:
   - wget
   - clang
   - alsa-lib-dev
+  - protoc
 artifacts:
   - ./LittleTown-amd64-musl
   - ./LittleTown-amd64-gnu
diff --git a/Cargo.lock b/Cargo.lock
index faa3389..5b2a6f6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,17 +8,260 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aead"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b613b8e1e3cf911a086f53f03bf286f52fd7a7258e4fa606f0ef220d39d8877"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "aes"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e8b47f52ea9bae42228d07ec09eb676433d7c4ed1ebdf0f1d1c29ed446f1ab8"
+dependencies = [
+ "cfg-if",
+ "cipher 0.3.0",
+ "cpufeatures",
+ "opaque-debug",
+]
+
+[[package]]
+name = "aes-gcm"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df5f85a83a7d8b0442b6aa7b504b8212c1733da07b98aae43d4bc21b2cb3cdf6"
+dependencies = [
+ "aead",
+ "aes",
+ "cipher 0.3.0",
+ "ctr",
+ "ghash",
+ "subtle",
+]
+
 [[package]]
 name = "ahash"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
 dependencies = [
- "getrandom",
+ "getrandom 0.2.8",
  "once_cell",
  "version_check",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
+
+[[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
+name = "asn1_der"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e22d1f4b888c298a027c99dc9048015fac177587de20fc30232a057dfbe24a21"
+
+[[package]]
+name = "async-channel"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf46fee83e5ccffc220104713af3292ff9bc7c64c7de289f66dae8e38d826833"
+dependencies = [
+ "concurrent-queue",
+ "event-listener",
+ "futures-core",
+]
+
+[[package]]
+name = "async-executor"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17adb73da160dfb475c183343c8cccd80721ea5a605d3eb57125f0a7b7a92d0b"
+dependencies = [
+ "async-lock",
+ "async-task",
+ "concurrent-queue",
+ "fastrand",
+ "futures-lite",
+ "slab",
+]
+
+[[package]]
+name = "async-global-executor"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1b6f5d7df27bd294849f8eec66ecfc63d11814df7a4f5d74168a2394467b776"
+dependencies = [
+ "async-channel",
+ "async-executor",
+ "async-io",
+ "async-lock",
+ "blocking",
+ "futures-lite",
+ "once_cell",
+]
+
+[[package]]
+name = "async-io"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c374dda1ed3e7d8f0d9ba58715f924862c63eae6849c92d3a18e7fbde9e2794"
+dependencies = [
+ "async-lock",
+ "autocfg",
+ "concurrent-queue",
+ "futures-lite",
+ "libc",
+ "log",
+ "parking",
+ "polling",
+ "slab",
+ "socket2",
+ "waker-fn",
+ "windows-sys 0.42.0",
+]
+
+[[package]]
+name = "async-lock"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8101efe8695a6c17e02911402145357e718ac92d3ff88ae8419e84b1707b685"
+dependencies = [
+ "event-listener",
+ "futures-lite",
+]
+
+[[package]]
+name = "async-process"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6381ead98388605d0d9ff86371043b5aa922a3905824244de40dc263a14fcba4"
+dependencies = [
+ "async-io",
+ "async-lock",
+ "autocfg",
+ "blocking",
+ "cfg-if",
+ "event-listener",
+ "futures-lite",
+ "libc",
+ "signal-hook",
+ "windows-sys 0.42.0",
+]
+
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+checksum = "62565bb4402e926b29953c785397c6dc0391b7b446e45008b0049eb43cec6f5d"
+dependencies = [
+ "async-channel",
+ "async-global-executor",
+ "async-io",
+ "async-lock",
+ "async-process",
+ "crossbeam-utils",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-lite",
+ "gloo-timers",
+ "kv-log-macro",
+ "log",
+ "memchr",
+ "once_cell",
+ "pin-project-lite 0.2.9",
+ "pin-utils",
+ "slab",
+ "wasm-bindgen-futures",
+]
+
+[[package]]
+name = "async-std-resolver"
+version = "0.21.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f2f8a4a203be3325981310ab243a28e6e4ea55b6519bffce05d41ab60e09ad8"
+dependencies = [
+ "async-std",
+ "async-trait",
+ "futures-io",
+ "futures-util",
+ "pin-utils",
+ "socket2",
+ "trust-dns-resolver",
+]
+
+[[package]]
+name = "async-task"
+version = "4.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a40729d2133846d9ed0ea60a8b9541bccddab49cd30f0715a1da672fe9a2524"
+
+[[package]]
+name = "async-trait"
+version = "0.1.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd7fce9ba8c3c042128ce72d8b2ddbf3a05747efb67ea0313c635e10bda47a2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "asynchronous-codec"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06a0daa378f5fd10634e44b0a29b2a87b890657658e072a30d6f26e57ddee182"
+dependencies = [
+ "bytes",
+ "futures-sink",
+ "futures-util",
+ "memchr",
+ "pin-project-lite 0.2.9",
+]
+
+[[package]]
+name = "atomic"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b88d82667eca772c4aa12f0f1348b3ae643424c8876448f3f7bd5787032e234c"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "atomic-waker"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "debc29dde2e69f9e47506b525f639ed42300fc014a3e007832592448fa8e4599"
+
 [[package]]
 name = "audir-sles"
 version = "0.1.0"
@@ -43,12 +286,71 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
+[[package]]
+name = "bimap"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc0455254eb5c6964c4545d8bac815e1a1be4f3afe0ae695ea539c12d728d44b"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "blake2"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46502ad458c9a52b69d4d4d32775c788b7a1b85e8bc9d482d92250fc0e3f8efe"
+dependencies = [
+ "digest 0.10.6",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cce20737498f97b993470a6e536b8523f0af7892a4f928cceb1ac5e52ebe7e"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "blocking"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c67b173a56acffd6d2326fb7ab938ba0b00a71480e14902b2591c87bc5741e8"
+dependencies = [
+ "async-channel",
+ "async-lock",
+ "async-task",
+ "atomic-waker",
+ "fastrand",
+ "futures-lite",
+]
+
+[[package]]
+name = "bs58"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
+
 [[package]]
 name = "bumpalo"
 version = "3.12.0"
@@ -67,384 +369,3274 @@ version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
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+name = "bytes"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+
+[[package]]
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+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
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 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+name = "chacha20"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
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+ "chacha20",
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+
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+dependencies = [
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+
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+
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+checksum = "de3887528ad530ba7bdbb1faa8275ec7a1155a45ffa57c37993960277145d640"
 
 [[package]]
-name = "quad-snd"
-version = "0.2.7"
+name = "windows_i686_msvc"
+version = "0.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53c954bb70493a2872775b74b663a767686e6d96d242e789d6a92cc4ebd2a64e"
-dependencies = [
- "audir-sles",
- "audrey",
- "libc",
- "quad-alsa-sys",
- "winapi",
-]
+checksum = "9cd9d32ba70453522332c14d38814bceeb747d80b3958676007acadd7e166956"
 
 [[package]]
-name = "quad-storage"
-version = "0.1.3"
+name = "windows_i686_msvc"
+version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e73edba8c792f3b5a45c68a1086f6f8c1bbda34ab9399a7faabd7dc7d4e14a0e"
-dependencies = [
- "lazy_static",
- "nanoserde",
- "quad-storage-sys",
-]
+checksum = "bf4d1122317eddd6ff351aa852118a2418ad4214e6613a50e0191f7004372605"
 
 [[package]]
-name = "quad-storage-sys"
-version = "0.1.0"
+name = "windows_x86_64_gnu"
+version = "0.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1187c77ced2cc6ae79bd6e35cc09e22159164a05c4d867e299bfbf1f801e9157"
-dependencies = [
- "sapp-jsutils",
-]
+checksum = "cfce6deae227ee8d356d19effc141a509cc503dfd1f850622ec4b0f84428e1f4"
 
 [[package]]
-name = "sapp-jsutils"
-version = "0.1.5"
+name = "windows_x86_64_gnu"
+version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb8ababa867431fa6c0a178248bfe7e77b5d1de357c9848883ba8e3946bb21d4"
+checksum = "c1040f221285e17ebccbc2591ffdc2d44ee1f9186324dd3e84e99ac68d699c45"
 
 [[package]]
-name = "smallvec"
-version = "0.6.14"
+name = "windows_x86_64_gnullvm"
+version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
-dependencies = [
- "maybe-uninit",
-]
+checksum = "628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463"
 
 [[package]]
-name = "ttf-parser"
-version = "0.15.2"
+name = "windows_x86_64_msvc"
+version = "0.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b3e06c9b9d80ed6b745c7159c40b311ad2916abb34a49e9be2653b90db0d8dd"
+checksum = "d19538ccc21819d01deaf88d6a17eae6596a12e9aafdbb97916fb49896d89de9"
 
 [[package]]
-name = "version_check"
-version = "0.9.4"
+name = "windows_x86_64_msvc"
+version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd"
 
 [[package]]
-name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
+name = "winreg"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
 
 [[package]]
-name = "winapi"
-version = "0.3.9"
+name = "x25519-dalek"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+checksum = "2392b6b94a576b4e2bf3c5b2757d63f10ada8020a2e4d08ac849ebcf6ea8e077"
 dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
+ "curve25519-dalek 3.2.1",
+ "rand_core 0.5.1",
+ "zeroize",
 ]
 
 [[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
+name = "yamux"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+checksum = "e5d9ba232399af1783a58d8eb26f6b5006fbefe2dc9ef36bd283324792d03ea5"
+dependencies = [
+ "futures",
+ "log",
+ "nohash-hasher",
+ "parking_lot 0.12.1",
+ "rand 0.8.5",
+ "static_assertions",
+]
 
 [[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
+name = "zeroize"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44bf07cb3e50ea2003396695d58bf46bc9887a1f362260446fad6bc4e79bd36c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 8aed4c6..4cde149 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,18 @@ repository = "https://codeberg.org/comcloudway/little_town"
 license = "AGPL-3.0-or-later"
 keywords = ["game", "isometric", "town", "macroquad"]
 
+[features]
+default = ["multiplayer"]
+multiplayer = ["libp2p", "futures", "async-std", "getrandom"]
+
 [dependencies]
 macroquad = "0.3.25"
 nanoserde = "0.1.32"
 quad-storage = "0.1.3"
+
+# p2p dependencies
+libp2p = { version = "0.44.0", optional = true }
+futures = { version = "0.3.21", optional = true }
+async-std = { version = "1.11.0", optional = true }
+getrandom = { version = "0.2", features = ["js"], optional = true }
+quad-rand = "0.2.1"
diff --git a/src/main.rs b/src/main.rs
index 7bd8a6b..e591cea 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,6 +11,9 @@ mod types;
 mod blocks;
 mod draw;
 
+#[cfg(feature = "multiplayer")]
+mod p2p;
+
 use types::{
     GameComponent,
     GameEvent
diff --git a/src/p2p.rs b/src/p2p.rs
new file mode 100644
index 0000000..75e3ac2
--- /dev/null
+++ b/src/p2p.rs
@@ -0,0 +1,446 @@
+// templated from poemhub
+// https://codeberg.org/comcloudway/poemhub/raw/branch/main/poemhub-peer/src/lib.rs
+// licensed under AGPL-3.0
+
+use async_std::task;
+use futures::{
+    prelude::stream::StreamExt,
+    channel:: mpsc::{
+        self,
+        UnboundedSender,
+    },
+    select,
+};
+use libp2p::{
+    floodsub::{self, Floodsub, FloodsubEvent},
+    identity,
+    kad::{
+        Kademlia,
+        KademliaConfig,
+        KademliaEvent,
+        record::store::MemoryStore
+    },
+    mdns::{Mdns, MdnsConfig, MdnsEvent},
+    swarm::SwarmEvent,
+    Multiaddr, NetworkBehaviour, PeerId, Swarm,
+    ping, Transport
+};
+use std::{
+    collections::HashMap,
+    sync::{
+        Arc,
+        RwLock,
+    },
+    thread,
+    time::{
+        UNIX_EPOCH,
+        SystemTime
+    }
+};
+use nanoserde::{SerJson, DeJson};
+use crate::blocks::Block;
+use crate::types::{
+    Pos3,
+    Direction
+};
+
+/// a collection of a PeerId and a MultiAddress
+/// used to connect to external servers
+pub type Bootnode = (PeerId, Multiaddr);
+/// a bootnode collection
+pub type Bootnodes = Vec<Bootnode>;
+
+/// A custom network behaviour that combines floodsub, ping and mDNS.
+/// floodsub is used to broadcast messages and events
+/// ping is used to keep the connection alive
+/// mDNS is used for peer discovery
+#[derive(NetworkBehaviour)]
+#[behaviour(out_event = "PeerEvent")]
+struct PeerBehaviour {
+    /// for message broadcasting
+    floodsub: Floodsub,
+    /// for local peer discovery
+    mdns: Mdns,
+    /// to keep connection alive
+    ping: ping::Behaviour,
+    /// for bootnode based external peer discovery
+    kademlia: Kademlia<MemoryStore>,
+
+    // Struct fields which do not implement NetworkBehaviour need to be ignored
+    #[behaviour(ignore)]
+    #[allow(dead_code)]
+    ignored_member: bool,
+}
+impl PeerBehaviour {
+    pub fn new(local_peer_id: PeerId) -> Self {
+        let mdns = task::block_on(Mdns::new(MdnsConfig::default())).expect("Failed to create mDNS config");
+        let kademlia_config = KademliaConfig::default();
+
+        Self {
+            floodsub: Floodsub::new(local_peer_id),
+            mdns,
+            kademlia: Kademlia::with_config(local_peer_id, MemoryStore::new(local_peer_id), kademlia_config),
+            ping: ping::Behaviour::new(ping::Config::new().with_keep_alive(true)),
+            ignored_member: false,
+        }
+    }
+}
+
+#[derive(Debug)]
+/// events that can be received by network Behaviour
+enum PeerEvent {
+    /// events from floodsub protocol
+    /// used to communicate between the peers
+    Floodsub(FloodsubEvent),
+    /// events from mDNS protocol
+    /// used for peer discovery in local network
+    Mdns(MdnsEvent),
+    /// events from ping protocol
+    /// used to keep connection alive
+    /// no real reson to actually store them
+    Ping(ping::Event),
+    Kademlia(KademliaEvent),
+}
+impl From<MdnsEvent> for PeerEvent {
+    fn from(v: MdnsEvent) -> Self {
+        Self::Mdns(v)
+    }
+}
+impl From<FloodsubEvent> for PeerEvent {
+    fn from(v: FloodsubEvent) -> Self {
+        Self::Floodsub(v)
+    }
+}
+impl From<ping::Event> for PeerEvent {
+    fn from(v: ping::Event) -> Self {
+        Self::Ping(v)
+    }
+}
+impl From<KademliaEvent> for PeerEvent {
+    fn from(v: KademliaEvent) -> Self {
+        Self::Kademlia(v)
+    }
+}
+
+/// the topic using which data is broadcasted
+const FLOODSUB_TOPIC: &str = "little-town";
+
+/// a GameEvent worth while broadcasting to peers
+#[derive(DeJson, SerJson)]
+pub enum GameAction {
+    /// event send when a block has been placed
+    /// contains the block, direction and position
+    PlaceBlock(Pos3, Block, Direction),
+    /// event send when a block has been removed
+    /// contains block and position
+    RemoveBlock(Pos3, Block),
+    /// event send when a peer joins the map
+    /// contains the inventory
+    /// including blocks and their count
+    /// the second argument is true
+    /// if the user has an infinite amount of items
+    TransmitInventory(HashMap<Block, usize>, bool),
+    /// one of the peers requested an inventory transmission
+    RequestInventory,
+    /// event send when a peer joins the map
+    /// contains the map
+    /// including blocks, their direction and position
+    TransmitMap(HashMap<Pos3, (Block, Direction)>),
+    /// one of the peers requested a map transmission
+    RequestMap,
+}
+
+enum ChannelEvent {
+    /// process game action
+    Action(GameAction),
+    /// leave the p2p session
+    Quit
+}
+
+/// struct to manage all relevant options for connection with poemhub p2p network
+pub struct Peer {
+    /// a list of known bootnodes,
+    /// should be provided by the application
+    /// NOTE: you might want to fetch a bootnode list from a file server
+    bootnodes: Bootnodes,
+    /// the local port to run on
+    /// recommended for bootnodes to be able to do port forwarding
+    /// NOTE: should only be used when running as bootnode
+    port: Option<usize>,
+    /// Sender
+    /// to broadcast ChannelEvents
+    bridge: Option<UnboundedSender<ChannelEvent>>,
+    /// actions to perform by client
+    /// should be processed by client in each iteration
+    incoming: Arc<RwLock<Vec<GameAction>>>,
+    /// only the host should respond to Request* actions
+    /// the host should not change their local state
+    /// when receiving Transmit* actions
+    /// true if this client is the host
+    is_host: bool
+}
+impl Peer {
+    /// create a new peer
+    /// in client mode
+    pub fn client() -> Self {
+        let mut this = Self {
+            bridge: None,
+            port: None,
+            bootnodes: Vec::new(),
+            incoming: Arc::new(RwLock::new(Vec::new())),
+            is_host: false
+        };
+        this.connect();
+        this
+    }
+    /// create a new peer
+    /// in host mode
+    pub fn host() -> Self {
+        let mut this = Self {
+            bridge: None,
+            port: None,
+            bootnodes: Vec::new(),
+            incoming: Arc::new(RwLock::new(Vec::new())),
+            is_host: true
+        };
+        this.connect();
+        this
+    }
+
+
+
+    /// adds a specific port to the setup
+    /// has to be called before connect() is being called
+    pub fn with_port(mut self, port: usize) -> Self {
+        self.port = Some(port);
+        self
+    }
+    /// appends the given bootnode to the bootnodes list
+    /// has to be called before connect() is being called
+    pub fn with_bootnode(mut self, node: Bootnode) -> Self {
+        self.bootnodes.push(node);
+        self
+    }
+
+    /// closes the connection to the p2p network
+    /// obviously requires you to connect beforehand
+    /// if closing the connection fails, an error will be thrown
+    pub fn close(&mut self) -> Option<()> {
+        if let Some(tx) = &mut self.bridge {
+            if tx.start_send(ChannelEvent::Quit).is_ok() {
+                return Some(());
+            }
+        }
+        None
+    }
+
+    /// attempts to broadcast an event
+    /// requires you to connect to the network first
+    /// NOTE: to be able to publish a poem you have to login first
+    /// This function only redirects your data
+    /// and thus wont throw an error as long as the data was transmitted to the second thread
+    pub fn perform_action(&mut self, act: GameAction) -> Option<()> {
+        let evt = ChannelEvent::Action(act);
+
+        // send data on bridge
+        if let Some(tx) = &mut self.bridge {
+            if tx.unbounded_send(evt).is_ok() {
+                return Some(());
+            }
+        }
+        None
+    }
+    /// returns the next action to process
+    /// if any
+    pub fn get_next_task(&mut self) -> Option<GameAction> {
+        if self.incoming.read().unwrap().is_empty() {
+            None
+        } else {
+            Some(self.incoming.write().unwrap().remove(0))
+        }
+    }
+
+    /// starts a new instance
+    /// everytime you run connect a new local key will be generated
+    /// NOTE: spawning multiple instances is possible - but if you do, you are not able to interact with them
+    /// NOTE: Before running connect please make sure that the old instance has been stopped
+    pub fn connect(&mut self) {
+        let (tx, mut rx) = mpsc::unbounded::<ChannelEvent>();
+        self.bridge=Some(tx);
+
+        let bootnodes = self.bootnodes.clone();
+        let port = self.port;
+        let inbox = self.incoming.clone();
+        let is_host = self.is_host.clone();
+
+        thread::spawn(move ||async_std::task::block_on(async {
+            let local_key = identity::Keypair::generate_ed25519();
+            let local_peer_id = PeerId::from(local_key.public());
+
+            // Set up an encrypted DNS-enabled TCP Transport over the Mplex and Yamux protocols
+            let transport = libp2p::tcp::TcpConfig::new()
+                .upgrade(libp2p::core::upgrade::Version::V1)
+                .authenticate(libp2p::noise::NoiseConfig::xx(
+                    libp2p::noise::Keypair::<libp2p::noise::X25519Spec>::new()
+                        .into_authentic(&local_key)
+                        .expect("Setting up noise encryption failed")
+                ).into_authenticated())
+                .multiplex(libp2p::mplex::MplexConfig::new())
+                .boxed();
+
+            // Create a Floodsub topic
+            let floodsub_topic = floodsub::Topic::new(FLOODSUB_TOPIC);
+
+            // Create a Swarm to manage peers and events
+            let mut swarm = {
+                let mut behaviour = PeerBehaviour::new(local_peer_id);
+
+                behaviour.floodsub.subscribe(floodsub_topic.clone());
+                Swarm::new(transport, behaviour, local_peer_id)
+            };
+
+            // Reach out to another node if specified
+            let mut i = 0;
+            while let Some(to_dial) = bootnodes.get(i) {
+                i+=1;
+                let (peer_id, addr) = to_dial;
+                swarm
+                    .behaviour_mut()
+                    .kademlia
+                    .add_address(
+                        &peer_id,
+                        addr.clone()
+                    );
+                swarm.behaviour_mut()
+                     .floodsub
+                     .add_node_to_partial_view(peer_id.clone());
+            }
+
+            swarm
+                .behaviour_mut()
+                .kademlia
+                .get_closest_peers(local_peer_id);
+            if !bootnodes.is_empty() {
+                swarm
+                    .behaviour_mut()
+                    .kademlia
+                    .bootstrap()
+                    .expect("Failed to bootstrap kademlia");
+            }
+
+            // Listen on all interfaces and whatever port the OS assigns
+            quad_rand::srand(SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs());
+            let port = port.unwrap_or(quad_rand::gen_range(4000, 9999));
+            println!("Setting up port {}", port);
+            swarm.listen_on(
+                format!(
+                    "/ip4/0.0.0.0/tcp/{}",port)
+                    .parse()
+                    .expect("Failed to parse provided port"))
+                 .expect("Failed to start p2p network");
+
+
+            loop {
+                select!{
+                    bridge_event = rx.select_next_some() => match bridge_event {
+                        ChannelEvent::Action(act) => {
+                            let json = act.serialize_json();
+                            println!("sending json: {}", json);
+                            swarm
+                                .behaviour_mut()
+                                .floodsub
+                                .publish_any(floodsub_topic.clone(), json.as_bytes())
+                        },
+                        ChannelEvent::Quit => break,
+                    },
+
+                    event = swarm.select_next_some() => match event {
+                        SwarmEvent::NewListenAddr { address, .. } => {
+                            println!("Listening on {:?}", address);
+                        }
+                        SwarmEvent::Behaviour(PeerEvent::Floodsub(
+                            FloodsubEvent::Message(message)
+                        )) => {
+                            // parse incoming action
+                            let text = String::from_utf8_lossy(&message.data);
+                            println!("received: {}", text);
+                            if let Ok(act) = GameAction::deserialize_json(&text) {
+                                // hand on act to game instance
+                                let may_process = if is_host {
+                                    match act {
+                                        GameAction::TransmitMap(_) | GameAction::TransmitInventory(_, _) => false,
+                                        _ => true
+                                    }
+                                } else {
+                                    match act {
+                                        GameAction::RequestMap | GameAction::RequestInventory => false,
+                                        _ => true
+                                    }
+                                };
+
+                                if may_process {
+                                    println!("Adding act to queue");
+                                    inbox.write().unwrap().push(act);
+                                }
+                            }
+                        },
+                        SwarmEvent::Behaviour(PeerEvent::Floodsub(
+                            FloodsubEvent::Subscribed {..}
+                        )) => {
+                            println!("Subscribed");
+                            // ask game to broadcast world map and inventory
+                            // game should then send ChannelEvent::Action as quickly as possible
+                            if !is_host {
+                                // request data
+                                // in case host lost the request
+                                for act in [ GameAction::RequestMap, GameAction::RequestInventory ] {
+                                    let json = act.serialize_json();
+                                    swarm
+                                        .behaviour_mut()
+                                        .floodsub
+                                        .publish_any(floodsub_topic.clone(), json.as_bytes())
+                                }
+                            }
+                        },
+                        SwarmEvent::Behaviour(PeerEvent::Mdns(
+                            MdnsEvent::Discovered(list)
+                        )) => {
+                            for (peer, a) in list {
+                                println!("Discovered {:?}", peer);
+                                swarm
+                                    .behaviour_mut()
+                                    .kademlia
+                                    .add_address(
+                                        &peer,
+                                        a.clone()
+                                    );
+                                swarm
+                                    .behaviour_mut()
+                                    .floodsub
+                                    .add_node_to_partial_view(peer);
+                            }
+                        }
+                        SwarmEvent::Behaviour(PeerEvent::Mdns(MdnsEvent::Expired(
+                            list
+                        ))) => {
+                            for (peer, _) in list {
+                                println!("Disconnected {:?}", peer);
+                                if !swarm.behaviour_mut().mdns.has_node(&peer) {
+                                    swarm
+                                        .behaviour_mut()
+                                        .floodsub
+                                        .remove_node_from_partial_view(&peer);
+                                }
+                            }
+                        },
+                        SwarmEvent::Behaviour(PeerEvent::Kademlia(e)) => {
+                            println!("Kademlia: {:?}", e);
+                        },
+                        // ping events can be ignored
+                        _ => {}
+                    }
+                }
+            }
+        }));
+    }
+}
diff --git a/src/screens/build.rs b/src/screens/build.rs
index 924b0c6..9876312 100644
--- a/src/screens/build.rs
+++ b/src/screens/build.rs
@@ -11,6 +11,12 @@ use crate::blocks::Block;
 use super::inventory::Inventory;
 use nanoserde::{DeJson, SerJson};
 
+#[cfg(feature = "multiplayer")]
+use crate::p2p::{
+    Peer,
+    GameAction
+};
+
 /// simple Vec2 implementation
 /// because I need to derive Serialize and Deserialize
 #[derive(Copy, Clone, SerJson, DeJson)]
@@ -64,7 +70,10 @@ pub struct BuildScreen {
     cam: Camera,
     show_inv: bool,
     inv: Inventory,
-    mouse_position: Option<(f32, f32)>
+    mouse_position: Option<(f32, f32)>,
+    #[cfg(feature="multiplayer")]
+    #[nserde(skip)]
+    multiplayer: Option<Peer>
 }
 impl BuildScreen {
     pub fn new() -> Self {
@@ -82,13 +91,35 @@ impl BuildScreen {
             cam: Camera::new(),
             show_inv: false,
             inv: Inventory::new(),
-            mouse_position: None
+            mouse_position: None,
+            #[cfg(feature="multiplayer")]
+            multiplayer: None
         };
 
         this.grid.insert(Pos3::new(0, 0, 0), (Block::default(), Direction::North));
 
         this
     }
+    /// creates a new BuildScreen instance
+    /// and starts the p2p multiplayer listener
+    #[cfg(feature="multiplayer")]
+    pub fn multiplayer(is_host: bool) -> Self {
+        if is_host {
+            let mut this = Self::new();
+            this.multiplayer = Some(Peer::host());
+            return this;
+        } else {
+            Self {
+                grid: HashMap::new(),
+                cam: Camera::new(),
+                show_inv: false,
+                inv: Inventory::new(),
+                mouse_position: None,
+                #[cfg(feature="multiplayer")]
+                multiplayer: Some(Peer::client())
+            }
+        }
+    }
 }
 
 fn get_screen_coords(pos: &Pos3, scale: f32, center: CVec2) -> (f32, f32) {
@@ -350,7 +381,13 @@ impl GameComponent for BuildScreen {
 
                             // destroy block
                             if let Some((block, _)) = self.grid.remove(&pos) {
-                                self.inv.add(block);
+                                self.inv.add(block.clone());
+
+                                // transmit block destruction
+                                // if multiplayer mode enabled
+                                if let Some(mp) = &mut self.multiplayer {
+                                    mp.perform_action(GameAction::RemoveBlock(pos.clone(), block));
+                                }
                             }
                         }
                     }
@@ -373,7 +410,13 @@ impl GameComponent for BuildScreen {
                         }
 
                         if let Some(block) = self.inv.place() {
-                            self.grid.insert(pos, (block, self.inv.direction.clone()));
+                            self.grid.insert(pos.clone(), (block.clone(), self.inv.direction.clone()));
+
+                            // transmit block placement
+                            // if multiplayer mode enabled
+                            if let Some(mp) = &mut self.multiplayer {
+                                mp.perform_action(GameAction::PlaceBlock(pos, block, self.inv.direction.clone()));
+                            }
                         }
                     }
                 }
@@ -450,11 +493,69 @@ impl GameComponent for BuildScreen {
             storage.set("build-map", &json);
 
             if is_key_pressed(KeyCode::Q) {
+
+                if let Some(mp) = &mut self.multiplayer {
+                    mp.close();
+                }
+
                 // close game
                 return GameEvent::Quit;
             }
         }
 
+        if let Some(mp) = &mut self.multiplayer {
+            if let Some(task) = mp.get_next_task() {
+                // match action
+                // and perform neccesarry action
+                match task {
+                    GameAction::RequestMap => {
+                        println!("Sending map");
+                        mp.perform_action(GameAction::TransmitMap(self.grid.clone()));
+                    },
+                    GameAction::RequestInventory => {
+                        println!("Sending inv");
+                        mp.perform_action(GameAction::TransmitInventory(self.inv.contents.clone(), self.inv.has_infinite_items()));
+                    },
+                    GameAction::PlaceBlock(pos, block, dir) => {
+                        // remove block from inventory
+                        if self.inv.has_infinite_items() {
+                            if let Some(slot) = self.inv.contents.get_mut(&block) {
+                                if *slot > 1 {
+                                    *slot -=1;
+                                } else if *slot == 0 {
+                                    self.inv.contents.remove(&block);
+                                }
+                            }
+                        }
+
+                        self.grid.insert(pos, (block, dir));
+                    },
+                    GameAction::RemoveBlock(pos, block) => {
+                        if self.inv.has_infinite_items() {
+                            if let Some(slot) = self.inv.contents.get_mut(&block) {
+                                *slot += 1;
+                            } else {
+                                self.inv.contents.insert(block, 1);
+                            }
+                        }
+
+                        self.grid.remove(&pos);
+                    },
+                    GameAction::TransmitMap(grid) => {
+                        self.grid = grid;
+                    },
+                    GameAction::TransmitInventory(inv, infty) => {
+                        self.inv.contents = inv;
+                        self.inv.toggle_infinite_items(infty);
+
+                        if self.grid.len() == 0 {
+                            mp.perform_action(GameAction::RequestMap);
+                        }
+                    }
+                }
+            }
+        }
+
         GameEvent::None
     }
 }
diff --git a/src/screens/inventory.rs b/src/screens/inventory.rs
index 2a18dc4..b49bae7 100644
--- a/src/screens/inventory.rs
+++ b/src/screens/inventory.rs
@@ -24,7 +24,7 @@ pub struct Inventory {
     /// with their appropriate amount
     /// if amount is zero, the item should be removed
     /// if infinite_items is true, the amount wont decrease
-    contents: HashMap<Block, usize>,
+    pub contents: HashMap<Block, usize>,
     /// which block is currently selected
     pub selected: Option<Block>,
     /// in which direction the block should be facing
@@ -37,6 +37,12 @@ pub struct Inventory {
     page: usize,
 }
 impl Inventory {
+    pub fn has_infinite_items(&self) -> bool {
+        self.infinite_items
+    }
+    pub fn toggle_infinite_items(&mut self, toggle: bool) {
+        self.infinite_items = toggle;
+    }
     pub fn new() -> Self {
         let mut cont = HashMap::new();
         let infinite_items = true;
diff --git a/src/screens/welcome.rs b/src/screens/welcome.rs
index 30b9ff5..ed3cbf4 100644
--- a/src/screens/welcome.rs
+++ b/src/screens/welcome.rs
@@ -21,17 +21,25 @@ impl GameComponent for WelcomeScreen {
     async fn draw(&self, assets: &AssetStore) {
         draw_centered_text(
             "Welcome",
-            screen_width()/2.0, screen_height()/2.0,
+            screen_width()/2.0, screen_height()/2.0 - 60.0,
             Some(assets.font), 100, WHITE);
 
         draw_wide_button(
             "Build", false,
+            screen_width()/2.0, screen_height()/2.0 + 0.0,
+            &assets);
+        draw_wide_button(
+            "Host", false,
             screen_width()/2.0, screen_height()/2.0 + 60.0,
             &assets);
+        draw_wide_button(
+            "Join", false,
+            screen_width()/2.0, screen_height()/2.0 + 120.0,
+            &assets);
 
         draw_wide_button(
             "Quit", false,
-            screen_width()/2.0, screen_height()/2.0 + 130.0,
+            screen_width()/2.0, screen_height()/2.0 + 180.0,
             &assets);
     }
     fn ev_loop(&mut self) -> GameEvent {
@@ -44,14 +52,20 @@ impl GameComponent for WelcomeScreen {
 
             if x >= btn_x_offset && x <= btn_x_offset + 190.0 {
                 // might be pressing a button
-                if y >= sh_2 + 60.0 && y <= sh_2 + 60.0 + btn_height {
-                    // pressing first button
-                    // launch build mode
+                if y >= sh_2 + 00.0 && y <= sh_2 + 0.0 + btn_height {
+                    // pressed build
                     return GameEvent::ChangeScreen(crate::Screen::Build(super::build::BuildScreen::new()));
                 }
-                if y >= sh_2 + 130.0 && y <= sh_2 + 130.0 + btn_height {
-                    // pressing second button
-                    // close game
+                if y >= sh_2 + 60.0 && y <= sh_2 + 60.0 + btn_height {
+                    // pressed host
+                    return GameEvent::ChangeScreen(crate::Screen::Build(super::build::BuildScreen::multiplayer(true)));
+                }
+                if y >= sh_2 + 120.0 && y <= sh_2 + 120.0 + btn_height {
+                    // pressed Join
+                    return GameEvent::ChangeScreen(crate::Screen::Build(super::build::BuildScreen::multiplayer(false)));
+                }
+                if y >= sh_2 + 180.0 && y <= sh_2 + 180.0 + btn_height {
+                    // pressed quit
                     return GameEvent::Quit;
                 }
             }
diff --git a/src/types.rs b/src/types.rs
index 618ff98..5260271 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -9,7 +9,7 @@ use nanoserde::{DeJson, SerJson};
 ///   /
 ///  /
 /// x
-#[derive(Debug,Eq,Hash,PartialEq, DeJson, SerJson)]
+#[derive(Debug,Eq,Hash,PartialEq, DeJson, SerJson, Clone)]
 pub struct Pos3 {
     pub x: i64,
     pub y: i64,
-- 
2.38.5