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//! TCP client implementation
pub mod actions;
pub use actions::TcpClientProtocol;
use anyhow::{Context, Result};
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio::net::TcpStream;
use tokio::sync::{mpsc, Mutex};
use tracing::{error, info, trace};
use crate::client::llm_budget::call_llm_for_client;
use crate::client::tcp::actions::{TCP_CLIENT_CONNECTED_EVENT, TCP_CLIENT_DATA_RECEIVED_EVENT};
use crate::llm::ollama_client::OllamaClient;
use crate::llm::ClientLlmResult;
use crate::logging::patterns;
use crate::protocol::Event;
use crate::state::app_state::AppState;
use crate::state::{ClientId, ClientStatus};
/// Connection state for LLM processing
#[derive(Debug, Clone, PartialEq)]
enum ConnectionState {
Idle,
Processing,
Accumulating,
}
/// Per-client data for LLM handling
struct ClientData {
state: ConnectionState,
queued_data: Vec<u8>,
memory: String,
}
/// TCP client that connects to a remote TCP server
pub struct TcpClient;
impl TcpClient {
/// Connect to a TCP server with integrated LLM actions
pub async fn connect_with_llm_actions(
remote_addr: String,
llm_client: OllamaClient,
app_state: Arc<AppState>,
status_tx: mpsc::UnboundedSender<String>,
client_id: ClientId,
) -> Result<SocketAddr> {
// Resolve and connect
let stream = TcpStream::connect(&remote_addr)
.await
.context(format!("Failed to connect to {}", remote_addr))?;
let local_addr = stream.local_addr()?;
let remote_sock_addr = stream.peer_addr()?;
info!(
"TCP client {} connected to {} (local: {})",
client_id, remote_sock_addr, local_addr
);
// Update client state
app_state
.update_client_status(client_id, ClientStatus::Connected)
.await;
let _ = status_tx.send(format!("[CLIENT] TCP client {} connected", client_id));
let _ = status_tx.send("__UPDATE_UI__".to_string());
// Split stream
let (mut read_half, write_half) = tokio::io::split(stream);
let write_half_arc = Arc::new(Mutex::new(write_half));
let write_half_for_connected = write_half_arc.clone();
// Initialize client data
let client_data = Arc::new(Mutex::new(ClientData {
state: ConnectionState::Idle,
queued_data: Vec::new(),
memory: String::new(),
}));
// Command channel: lets the dashboard (and any programmatic caller)
// inject actions into this loop via AppState::send_to_client.
//
// Registered BEFORE the connected event is handled: a `manual` routing
// rule can park that event at the dashboard for minutes, and until
// registration the UI reports "no command channel" — reading as a
// protocol limitation when it is only a queue. Registered here, a send
// during the park waits in the channel instead of being refused.
let mut command_rx =
crate::client::command_support::register_command_channel(&app_state, client_id).await;
// Call LLM with tcp_connected event
if let Some(instruction) = app_state.get_instruction_for_client(client_id).await {
let event = Event::new(
&TCP_CLIENT_CONNECTED_EVENT,
serde_json::json!({
"remote_addr": remote_sock_addr.to_string(),
}),
);
match call_llm_for_client(
&llm_client,
&app_state,
client_id.to_string(),
&instruction,
&client_data.lock().await.memory,
Some(&event),
&crate::client::tcp::actions::TcpClientProtocol,
&status_tx,
)
.await
{
Ok(result) => {
// Update memory if provided
if let Some(new_memory) = result.memory_updates {
client_data.lock().await.memory = new_memory;
}
// Execute actions from LLM response using the proper execute_action method
use crate::llm::actions::client_trait::Client;
let protocol = crate::client::tcp::actions::TcpClientProtocol::new();
for action in result.actions {
match protocol.execute_action(action) {
Ok(
crate::llm::actions::client_trait::ClientActionResult::SendData(
bytes,
),
) => {
let mut write_guard = write_half_for_connected.lock().await;
if let Err(e) = write_guard.write_all(&bytes).await {
error!("Failed to send data after connect: {}", e);
} else if let Err(e) = write_guard.flush().await {
error!("Failed to flush after connect: {}", e);
} else {
info!("Sent {} {}", bytes.len(), patterns::TCP_CLIENT_SENT);
}
}
Ok(
crate::llm::actions::client_trait::ClientActionResult::Disconnect,
) => {
info!("LLM requested disconnect after connect");
return Ok(local_addr);
}
Ok(
crate::llm::actions::client_trait::ClientActionResult::WaitForMore,
) => {
// Just wait for data
}
Ok(_) => {
// Other action results
}
Err(e) => {
error!("Failed to execute action after connect: {}", e);
}
}
}
}
Err(e) => {
error!("LLM error on tcp_connected event: {}", e);
}
}
}
// Spawn read loop. The handle is registered with AppState so that
// stop_client / remove_client can abort it — dropping a JoinHandle only
// detaches the task, leaving the socket open and the LLM being called.
let task_registrar = app_state.clone();
let handle = tokio::spawn(async move {
info!("TCP client {} read loop started", client_id);
let mut buffer = vec![0u8; 8192];
'read_loop: loop {
let read_result = tokio::select! {
read = read_half.read(&mut buffer) => read,
Some(cmd) = command_rx.recv() => {
let disconnect = crate::client::command_support::handle_stream_client_command(
&crate::client::tcp::actions::TcpClientProtocol,
&write_half_arc,
cmd,
client_id,
&app_state,
&status_tx,
)
.await;
if disconnect {
app_state
.update_client_status(client_id, ClientStatus::Disconnected)
.await;
let _ = status_tx.send(format!(
"[CLIENT] TCP client {} disconnected (injected action)",
client_id
));
let _ = status_tx.send("__UPDATE_UI__".to_string());
break;
}
continue;
}
};
match read_result {
Ok(0) => {
info!(
"TCP client {} {}",
client_id,
patterns::TCP_CLIENT_DISCONNECTED
);
app_state
.update_client_status(client_id, ClientStatus::Disconnected)
.await;
let _ = status_tx
.send(format!("[CLIENT] TCP client {} disconnected", client_id));
let _ = status_tx.send("__UPDATE_UI__".to_string());
break;
}
Ok(n) => {
let data = buffer[..n].to_vec();
info!(
"TCP client {} received {} {}",
client_id,
n,
patterns::TCP_CLIENT_RECEIVED
);
trace!("TCP client {} received {} bytes", client_id, n);
// Handle data with LLM
let mut client_data_lock = client_data.lock().await;
match client_data_lock.state {
ConnectionState::Idle => {
// Process immediately
client_data_lock.state = ConnectionState::Processing;
drop(client_data_lock);
// Call LLM
if let Some(instruction) =
app_state.get_instruction_for_client(client_id).await
{
let protocol = Arc::new(
crate::client::tcp::actions::TcpClientProtocol::new(),
);
let event = Event::new(
&TCP_CLIENT_DATA_RECEIVED_EVENT,
serde_json::json!({
"data_hex": hex::encode(&data),
"data_length": data.len(),
}),
);
match call_llm_for_client(
&llm_client,
&app_state,
client_id.to_string(),
&instruction,
&client_data.lock().await.memory,
Some(&event),
protocol.as_ref(),
&status_tx,
)
.await
{
Ok(ClientLlmResult {
actions,
memory_updates,
}) => {
// Update memory
if let Some(mem) = memory_updates {
client_data.lock().await.memory = mem;
}
// Execute actions
for action in actions {
use crate::llm::actions::client_trait::Client;
match protocol.as_ref().execute_action(action) {
Ok(crate::llm::actions::client_trait::ClientActionResult::SendData(bytes)) => {
let mut write_guard = write_half_arc.lock().await;
if write_guard.write_all(&bytes).await.is_ok() {
if write_guard.flush().await.is_ok() {
trace!("TCP client {} sent {} bytes", client_id, bytes.len());
}
}
}
Ok(crate::llm::actions::client_trait::ClientActionResult::Disconnect) => {
info!("TCP client {} disconnecting", client_id);
app_state
.update_client_status(client_id, ClientStatus::Disconnected)
.await;
let _ = status_tx.send(format!(
"[CLIENT] TCP client {} disconnected",
client_id
));
let _ = status_tx.send("__UPDATE_UI__".to_string());
break 'read_loop;
}
_ => {}
}
}
}
Err(e) => {
error!("LLM error for TCP client {}: {}", client_id, e);
}
}
}
// Process queued data if any
let mut client_data_lock = client_data.lock().await;
if !client_data_lock.queued_data.is_empty() {
client_data_lock.queued_data.clear();
}
client_data_lock.state = ConnectionState::Idle;
}
ConnectionState::Processing => {
// Queue data
client_data_lock.queued_data.extend_from_slice(&data);
client_data_lock.state = ConnectionState::Accumulating;
}
ConnectionState::Accumulating => {
// Continue queuing
client_data_lock.queued_data.extend_from_slice(&data);
}
}
}
Err(e) => {
error!("TCP client {} read error: {}", client_id, e);
app_state
.update_client_status(client_id, ClientStatus::Error(e.to_string()))
.await;
let _ = status_tx.send("__UPDATE_UI__".to_string());
break;
}
}
}
// The loop owns the only receiver; dropping the registered handle
// makes later send_to_client calls fail fast instead of timing out.
app_state.remove_client_handle(client_id).await;
});
task_registrar.register_client_task(client_id, handle).await;
Ok(local_addr)
}
}