diff --git a/src/common/client.rs b/src/common/client.rs
new file mode 100644
index 0000000..ad3b378
--- /dev/null
+++ b/src/common/client.rs
@@ -0,0 +1,91 @@
+use libpso::crypto::{PSOCipher, NullCipher};
+use libpso::{PSOPacket, PacketParseError};
+
+use crate::common::serverstate::{ServerState, ServerPacket, OnConnect};
+use crate::common::network::{send_packet, recv_packet};
+
+use std::net;
+use mio::tcp::TcpStream;
+use mio::{Poll, Events, Token, Ready, PollOpt};
+
+pub struct Client<P, E> {
+    running: bool,
+    socket: mio::tcp::TcpStream,
+    cipher_in: Box<dyn PSOCipher>,
+    cipher_out: Box<dyn PSOCipher>,
+    state: Box<dyn ServerState<Packet = P, PacketError = E>>,
+}
+
+impl<P: ServerPacket + std::fmt::Debug, E: std::fmt::Debug> Client<P, E> {
+    pub fn new(socket: net::TcpStream, state: Box<dyn ServerState<Packet = P, PacketError = E>>) -> Client<P, E> {
+        let mut client = Client {
+            running: true,
+            socket: mio::tcp::TcpStream::from_stream(socket).expect("could not convert socket to nonblocking"),
+            cipher_in: Box::new(NullCipher {}),
+            cipher_out: Box::new(NullCipher {}),
+            state: state,
+        };
+
+        for task in client.state.on_connect() {
+            match task {
+                OnConnect::Packet(pkt) => client.send(&*pkt),
+                OnConnect::Cipher((cipher_in, cipher_out)) => {
+                    client.cipher_in = cipher_in;
+                    client.cipher_out = cipher_out;
+                },
+            }
+        }
+        
+        client
+    }
+
+    fn send(&mut self, pkt: &dyn PSOPacket) {
+        match send_packet(&mut self.socket, &mut *self.cipher_out, pkt) {
+            Ok(_) => {
+                println!("[patch] send ({:?}): {:?}", self.socket, pkt);
+            },
+            Err(err) => {
+                println!("[patch] error sending packet to {:?}: {:?}", self.socket, err);
+                self.running = false;
+            }
+        }
+    }
+
+    pub fn io_loop(mut self) {
+        let poll = mio::Poll::new().unwrap();
+        poll.register(&self.socket, Token(0), Ready::readable(), PollOpt::edge()).unwrap();
+
+
+        let mut events = Events::with_capacity(1024);
+        loop {
+            poll.poll(&mut events, None).unwrap();
+
+            for event in &events{
+                println!("event! {:?}", event);
+                if event.token() == Token(0) {
+                    loop {
+                        let pkt = recv_packet(&mut self.socket, &mut *self.cipher_in)
+                            .and_then(|pkt| {
+                                P::from_bytes(&pkt)
+                                    .map_err(|err| err.into())
+                            });
+
+                        match pkt {
+                            Ok(pkt) => {
+                                let response = self.state.handle(&pkt);
+                                for r in response {
+                                    self.send(&*r);
+                                }
+                            },
+                            Err(err) => {
+                                println!("error recv-ing packet with {:?}: {:?}", self.socket, err);
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        
+    }
+}
diff --git a/src/common/mod.rs b/src/common/mod.rs
index a6bb89e..29ec690 100644
--- a/src/common/mod.rs
+++ b/src/common/mod.rs
@@ -1,4 +1,5 @@
 pub mod cipherkeys;
 pub mod network;
-
+pub mod serverstate;
+pub mod client;
 
diff --git a/src/common/network.rs b/src/common/network.rs
index c1976f0..f110462 100644
--- a/src/common/network.rs
+++ b/src/common/network.rs
@@ -36,7 +36,6 @@ pub fn recv_packet<T: Read>(socket: &mut T, cipher: &mut dyn PSOCipher) -> Resul
     let mut offset = 0;
     while offset < cipher.header_size() {
         let diff = socket.read(&mut size_buf[offset..])?;
-        println!("! {} {:?}", diff, size_buf);
         if diff == 0 {
             return Err(PacketNetworkError::ClientDisconnected);
         }
@@ -76,6 +75,8 @@ pub fn recv_packet<T: Read>(socket: &mut T, cipher: &mut dyn PSOCipher) -> Resul
     Ok(full_buf)
 }
 
+// TODO: this fails horribly when the send buffer is full
+// if it didnt send it all make a mio poll
 pub fn send_packet<T: Write>(socket: &mut T, cipher: &mut dyn PSOCipher, pkt: &dyn PSOPacket) -> Result<(), PacketNetworkError> {
     let buf = pkt.as_bytes();
     //println!("[send]: {:X?}", buf);
diff --git a/src/common/serverstate.rs b/src/common/serverstate.rs
new file mode 100644
index 0000000..affb31f
--- /dev/null
+++ b/src/common/serverstate.rs
@@ -0,0 +1,23 @@
+use libpso::{PSOPacket, PacketParseError};
+use libpso::crypto::PSOCipher;
+
+
+pub enum OnConnect {
+    Packet(Box<dyn PSOPacket>),
+    Cipher((Box<dyn PSOCipher>, Box<dyn PSOCipher>)),
+}
+
+pub trait ServerPacket: Sized {
+    fn from_bytes(data: &Vec<u8>) -> Result<Self, PacketParseError>;
+}
+
+pub trait ServerState {
+    type Packet: ServerPacket;
+    type PacketError;
+    
+    //fn handle(&mut self, pkt: &Self::Packet) -> Result<Vec<Box<dyn PSOPacket>>, Self::PacketError>;
+    fn on_connect(&mut self) -> Vec<OnConnect>;
+    //fn handle(&mut self, pkt: &Self::Packet) -> Result<Box<dyn Iterator<Item = Box<dyn PSOPacket>>>, Self::PacketError>;
+    fn handle(&mut self, pkt: &Self::Packet) -> Box<dyn Iterator<Item = Box<dyn PSOPacket>>>;
+}
+
diff --git a/src/patch/main.rs b/src/patch/main.rs
index 8760a98..91de59f 100644
--- a/src/patch/main.rs
+++ b/src/patch/main.rs
@@ -12,9 +12,10 @@ use rand::{Rng, RngCore};
 use crc::{crc32, Hasher32};
 use libpso::{PacketParseError, PSOPacket};
 use libpso::packet::patch::*;
-use libpso::crypto::{CipherError, PSOCipher, NullCipher};
 use libpso::crypto::pc::PSOPCCipher;
 use elseware::common::network::{send_packet, recv_packet, PacketNetworkError};
+use elseware::common::client::Client;
+use elseware::common::serverstate::{ServerPacket, ServerState, OnConnect};
 
 const PATCH_PORT: u16 = 11000;
 
@@ -43,25 +44,6 @@ impl From<std::io::Error> for PatchError {
     }
 }
 
-#[derive(Debug)]
-pub enum PatchPacket {
-    PatchWelcomeReply(PatchWelcomeReply),
-    LoginReply(LoginReply),
-    FileInfoReply(FileInfoReply),
-    FileInfoListEnd(FileInfoListEnd),
-}
-
-impl PatchPacket {
-    pub fn from_bytes(data: &Vec<u8>) -> Result<PatchPacket, PacketParseError> {
-        match data[2] {
-            0x02 => Ok(PatchPacket::PatchWelcomeReply(PatchWelcomeReply::from_bytes(data)?)),
-            0x04 => Ok(PatchPacket::LoginReply(LoginReply::from_bytes(data)?)),
-            0x0F => Ok(PatchPacket::FileInfoReply(FileInfoReply::from_bytes(data)?)),
-            0x10 => Ok(PatchPacket::FileInfoListEnd(FileInfoListEnd::from_bytes(data)?)),
-            _ => Err(PacketParseError::WrongPacketForServerType)
-        }
-    }
-}
 
 #[derive(Debug, Clone)]
 struct PatchFile {
@@ -70,7 +52,6 @@ struct PatchFile {
     size: u32,
 }
 
-
 enum PatchTreeIterItem {
     Directory(PathBuf),
     File(PathBuf, u32),
@@ -109,50 +90,87 @@ impl PatchFileTree {
 }
 
 
+#[derive(Debug)]
+pub enum PatchPacket {
+    PatchWelcomeReply(PatchWelcomeReply),
+    LoginReply(LoginReply),
+    FileInfoReply(FileInfoReply),
+    FileInfoListEnd(FileInfoListEnd),
+}
+
+impl ServerPacket for PatchPacket {
+    fn from_bytes(data: &Vec<u8>) -> Result<PatchPacket, PacketParseError> {
+        match data[2] {
+            0x02 => Ok(PatchPacket::PatchWelcomeReply(PatchWelcomeReply::from_bytes(data)?)),
+            0x04 => Ok(PatchPacket::LoginReply(LoginReply::from_bytes(data)?)),
+            0x0F => Ok(PatchPacket::FileInfoReply(FileInfoReply::from_bytes(data)?)),
+            0x10 => Ok(PatchPacket::FileInfoListEnd(FileInfoListEnd::from_bytes(data)?)),
+            _ => Err(PacketParseError::WrongPacketForServerType)
+        }
+    }
+}
 
-struct Client {
-    running: bool,
-    key_in: u32,
-    key_out: u32,
-    socket: mio::tcp::TcpStream,
-    cipher_in: Box<dyn PSOCipher>,
-    cipher_out: Box<dyn PSOCipher>,
+struct PatchServerState {
     patch_file_tree: PatchFileTree,
     patch_file_lookup: HashMap<u32, PatchFile>,
     patch_file_info: Vec<FileInfoReply>,
 }
 
-impl Client {
-    fn new(socket: net::TcpStream, patch_file_tree: PatchFileTree, patch_file_lookup: HashMap<u32, PatchFile>) -> Client {
+impl PatchServerState {
+    fn new(patch_file_tree: PatchFileTree, patch_file_lookup: HashMap<u32, PatchFile>) -> PatchServerState {
+        PatchServerState {
+            patch_file_tree: patch_file_tree,
+            patch_file_lookup: patch_file_lookup,
+            patch_file_info: Vec::new(),
+        }
+    }
+}
+
+impl ServerState for PatchServerState {
+    type Packet = PatchPacket;
+    type PacketError = PatchError;
+
+    fn on_connect(&mut self) -> Vec<OnConnect> {
         let mut rng = rand::thread_rng();
         let key_in: u32 = rng.gen();
         let key_out: u32 = rng.gen();
 
-        Client {
-            running: true,
-            key_in: key_in,
-            key_out: key_out,
-            socket: mio::tcp::TcpStream::from_stream(socket).expect("could not convert socket to nonblocking"),
-            cipher_in: Box::new(NullCipher {}),
-            cipher_out: Box::new(NullCipher {}),
-            patch_file_tree: patch_file_tree,
-            patch_file_lookup: patch_file_lookup,
-            patch_file_info: Vec::new()
-        }
+        vec![OnConnect::Packet(Box::new(PatchWelcome::new(key_out, key_in))),
+             OnConnect::Cipher((Box::new(PSOPCCipher::new(key_in)), Box::new(PSOPCCipher::new(key_out))))
+        ]
     }
 
-    fn send(&mut self, pkt: &dyn PSOPacket) {
-        match send_packet(&mut self.socket, &mut *self.cipher_out, pkt) {
-            Ok(_) => {
-                println!("[patch] send ({:?}): {:?}", self.socket, pkt);
+    fn handle(&mut self, pkt: &PatchPacket) -> Box<dyn Iterator<Item = Box<dyn PSOPacket>>> {
+        match pkt {
+            PatchPacket::PatchWelcomeReply(_pkt) => {
+                let p: Vec<Box<dyn PSOPacket>> = vec![Box::new(RequestLogin {})];
+                Box::new(p.into_iter())
+            },
+            PatchPacket::LoginReply(_pkt) => {
+                let mut p: Vec<Box<dyn PSOPacket>> = vec![Box::new(Message::new("hello player".to_string()))];
+                p.append(&mut get_file_list_packets(&self.patch_file_tree));
+                p.push(Box::new(PatchEndList {}));
+                Box::new(p.into_iter())
+            },
+            PatchPacket::FileInfoReply(pkt) => {
+                self.patch_file_info.push(pkt.clone());
+                Box::new(None.into_iter())
             },
-            Err(err) => {
-                println!("[patch] error sending packet to {:?}: {:?}", self.socket, err);
-                self.running = false;
+            PatchPacket::FileInfoListEnd(_pkt) => {
+                let need_update = self.patch_file_info.iter()
+                    .filter(|file_info| does_file_need_updating(file_info, &self.patch_file_lookup))
+                    .collect::<Vec<_>>();
+
+                let total_size = need_update.iter().fold(0, |a, file_info| a + file_info.size);
+                let total_files = need_update.len() as u32;
+
+                let p: Vec<Box<dyn PSOPacket>> = vec![Box::new(FilesToPatchMetadata::new(total_size, total_files)),
+                                                      Box::new(PatchStartList {}),
+                ];
+                Box::new(p.into_iter().chain(SendFileIterator::new(&self)))
             }
         }
     }
-
 }
 
 fn load_patch_dir(basedir: &str, patchbase: &str, file_ids: &mut HashMap<u32, PatchFile>) -> PatchFileTree {
@@ -192,7 +210,6 @@ fn generate_patch_tree(basedir: &str) -> (PatchFileTree, HashMap<u32, PatchFile>
 }
 
 
-// TODO: this should be a function that takes client and sends packets instead of returning a vec of packets
 fn get_file_list_packets(patch_file_tree: &PatchFileTree) -> Vec<Box<dyn PSOPacket>> {
     let mut pkts: Vec<Box<dyn PSOPacket>> = Vec::new();
 
@@ -213,20 +230,6 @@ fn get_file_list_packets(patch_file_tree: &PatchFileTree) -> Vec<Box<dyn PSOPack
     pkts
 }
 
-
-fn send_file_list(client: &mut Client) -> Result<(), PatchError> {
-    client.send(&PatchStartList {});
-
-    let pkts = get_file_list_packets(&client.patch_file_tree);
-    for pkt in pkts {
-        client.send(&*pkt);
-    }
-
-    client.send(&PatchEndList {});
-
-    Ok(())
-}
-
 fn get_checksum_and_size(path: &PathBuf) -> Result<(u32, u32), PatchError> {
     let file = fs::File::open(path)?;
     let size = file.metadata().unwrap().len();
@@ -248,124 +251,92 @@ fn does_file_need_updating(file_info: &FileInfoReply, patch_file_lookup: &HashMa
     patch_file.checksum != file_info.checksum || patch_file.size != file_info.size
 }
 
-fn send_file(client: &mut Client, actual_path: &PathBuf, patch_path: &PathBuf, id: u32) -> Result<(), PatchError>{
-    let file = fs::File::open(actual_path)?;
-    let size = file.metadata().unwrap().len();
-
-    client.send(&StartFileSend::new(patch_path.to_str().unwrap(), size as u32, id));
 
-    let mut buf = [0u8; PATCH_FILE_CHUNK_SIZE as usize];
-    let mut reader = io::BufReader::new(file);
-    let mut chunk_num = 0;
-    while let Ok(len) = reader.read(&mut buf) {
-        if len == 0 {
-            break;
-        }
-
-        let mut crc = crc32::Digest::new(crc32::IEEE);
-        crc.write(&buf[0..len]);
-
-        let pkt = FileSend {
-            chunk_num: chunk_num,
-            checksum: crc.sum32(),
-            chunk_size: len as u32,
-            buffer: buf
-        };
-
-        client.send(&pkt);
-
-        chunk_num += 1;
-    }
-
-    client.send(&EndFileSend::new());
-    Ok(())
+struct SendFileIterator {
+    done: bool,
+    file_iter: Box<dyn Iterator<Item = PatchTreeIterItem>>,
+    file_ids_to_update: HashSet<u32>,
+    patch_file_lookup: HashMap<u32, PatchFile>,
+    current_file: Option<io::BufReader<fs::File>>,
+    chunk_num: u32,
 }
 
-
-fn send_file_data(client: &mut Client) -> Result<(), PatchError> {
-    let need_update = client.patch_file_info.iter()
-        .filter(|file_info| does_file_need_updating(file_info, &client.patch_file_lookup))
-        .collect::<Vec<_>>();
-
-    let total_size = need_update.iter().fold(0, |a, file_info| a + file_info.size);
-    let total_files = need_update.len() as u32;
-
-    let file_ids_to_update = need_update.iter().map(|k| k.id).collect::<HashSet<_>>();
-
-    client.send(&FilesToPatchMetadata::new(total_size, total_files));
-    client.send(&PatchStartList {});
-
-    for file in client.patch_file_tree.flatten() {
-        match file {
-            PatchTreeIterItem::Directory(path) => {
-                client.send(&ChangeDirectory::new(path.to_str().unwrap()));
-            },
-            PatchTreeIterItem::File(path, id) => {
-                if file_ids_to_update.contains(&id) {
-                    let patch_file = client.patch_file_lookup.get(&id).unwrap().clone();
-                    send_file(client, &patch_file.path, &path, id)?;
-                }
-            },
-            PatchTreeIterItem::UpDirectory => {
-                client.send(&UpOneDirectory {});
-            }
+impl SendFileIterator {
+    fn new(state: &PatchServerState) -> SendFileIterator {
+        let need_update = state.patch_file_info.iter()
+            .filter(|file_info| does_file_need_updating(file_info, &state.patch_file_lookup))
+            .collect::<Vec<_>>();
+        let file_ids_to_update = need_update.iter().map(|k| k.id).collect::<HashSet<_>>();
+
+        SendFileIterator {
+            done: false,
+            file_ids_to_update: file_ids_to_update,
+            patch_file_lookup: state.patch_file_lookup.clone(),
+            file_iter: Box::new(state.patch_file_tree.flatten().into_iter()),
+            current_file: None,
+            chunk_num: 0,
         }
-
     }
-    client.send(&FinalizePatching {});
-
-    Ok(())
 }
 
+impl Iterator for SendFileIterator {
+    type Item = Box<dyn PSOPacket>;
 
-fn handle_packet(client: &mut Client, pkt: PatchPacket) -> Result<(), PatchError> {
-    println!("[patch] recv({:?}): {:?}", client.socket, pkt);
-
-    match pkt {
-        PatchPacket::PatchWelcomeReply(_pkt) => {
-            client.send(&RequestLogin {});
-        },
-        PatchPacket::LoginReply(_pkt) => {
-            client.send(&Message::new("hello player".to_string()));
-            send_file_list(client)?;
-        },
-        PatchPacket::FileInfoReply(pkt) => {
-            client.patch_file_info.push(pkt);
-        },
-        PatchPacket::FileInfoListEnd(_pkt) => {
-            send_file_data(client)?;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.done {
+            return None;
         }
-    }
 
-    Ok(())
-}
-
-fn client_loop(mut client: Client) {
-    let poll = mio::Poll::new().unwrap();
-    poll.register(&client.socket, Token(0), Ready::readable(), PollOpt::edge()).unwrap();
-
-    let mut events = Events::with_capacity(1024);
-    loop {
-        poll.poll(&mut events, None).unwrap();
-
-        for event in &events{
-            println!("event! {:?}", event);
-            if event.token() == Token(0) {
-                loop {
-                    let pkt = recv_packet(&mut client.socket, &mut *client.cipher_in)
-                        .and_then(|pkt| {
-                            PatchPacket::from_bytes(&pkt)
-                                .map_err(|err| err.into())
-                        });
-
-                    match pkt {
-                        Ok(pkt) => {
-                            handle_packet(&mut client, pkt).expect("could not handle packet");
-                        },
-                        Err(err) => {
-                            println!("[patch] error recv-ing packet with {:?}: {:?}", client.socket, err);
-                            break;
+        match self.current_file {
+            Some(ref mut file) => {
+                let mut buf = [0u8; PATCH_FILE_CHUNK_SIZE as usize];
+                let len = file.read(&mut buf).unwrap();
+                if len == 0 {
+                    self.current_file = None;
+                    self.chunk_num = 0;
+                    Some(Box::new(EndFileSend::new()))
+                }
+                else {
+                    let mut crc = crc32::Digest::new(crc32::IEEE);
+                    crc.write(&buf[0..len]);
+                    let pkt = FileSend {
+                        chunk_num: self.chunk_num,
+                        checksum: crc.sum32(),
+                        chunk_size: len as u32,
+                        buffer: buf,
+                    };
+                    self.chunk_num += 1;
+                    Some(Box::new(pkt))
+                }
+            },
+            None => {
+                match self.file_iter.next() {
+                    Some(next_file) => {
+                        match next_file {
+                            PatchTreeIterItem::Directory(path) => {
+                                Some(Box::new(ChangeDirectory::new(path.to_str().unwrap())))
+                            },
+                            PatchTreeIterItem::File(path, id) => {
+                                if self.file_ids_to_update.contains(&id) {
+                                    let patch_file = self.patch_file_lookup.get(&id).unwrap();
+                                    let file = fs::File::open(&patch_file.path).unwrap();
+                                    let size = file.metadata().unwrap().len();
+                                    self.current_file = Some(io::BufReader::new(file));
+                                    Some(Box::new(StartFileSend::new(path.to_str().unwrap(), size as u32, id)))
+                                }
+                                else {
+                                    self.next()
+                                }
+                            },
+                            PatchTreeIterItem::UpDirectory => {
+                                Some(Box::new(UpOneDirectory {}))
+                            },
                         }
+                    },
+                    None => {
+                        self.current_file = None;
+                        self.done = true;
+                        Some(Box::new(FinalizePatching {}))
                     }
                 }
             }
@@ -373,16 +344,16 @@ fn client_loop(mut client: Client) {
     }
 }
 
+
+
 fn new_client(socket: net::TcpStream, patch_file_tree: PatchFileTree, patch_file_lookup: HashMap<u32, PatchFile>) {
-    let mut client = Client::new(socket, patch_file_tree, patch_file_lookup);
-    let welcome_pkt = PatchWelcome::new(client.key_out, client.key_in);
-    client.send(&welcome_pkt);
-    client.cipher_in = Box::new(PSOPCCipher::new(client.key_in));
-    client.cipher_out = Box::new(PSOPCCipher::new(client.key_out));
-    client_loop(client);
+    let state = PatchServerState::new(patch_file_tree, patch_file_lookup);
+    let client = Client::new(socket, Box::new(state));
+    client.io_loop();
 }
 
 
+
 fn main() {
     println!("[patch] starting server");