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//! mcp.* — MCP server client bridge (async).
//!
//! All functions use `create_async_function` so that Lua coroutines
//! yield while waiting for MCP server I/O.
use mlua::prelude::*;
use std::sync::Arc;
use tokio::sync::Mutex;
use crate::mcp_client::McpManager;
use super::{json_to_lua, lua_to_json};
pub fn register(lua: &Lua, manager: &Arc<Mutex<McpManager>>) -> LuaResult<()> {
let mcp_tbl = lua.create_table()?;
// mcp.connect(name, command, args)
{
let mgr = Arc::clone(manager);
mcp_tbl.set(
"connect",
lua.create_async_function(
move |_, (name, command, args): (String, String, Option<LuaTable>)| {
let mgr = Arc::clone(&mgr);
async move {
let args: Vec<String> = match args {
Some(tbl) => {
let mut v = Vec::new();
for pair in tbl.pairs::<LuaValue, String>() {
let (_, s) = pair?;
v.push(s);
}
v
}
None => Vec::new(),
};
mgr.lock()
.await
.connect(&name, &command, &args)
.await
.map_err(LuaError::external)
}
},
)?,
)?;
}
// mcp.list_tools(name)
{
let mgr = Arc::clone(manager);
mcp_tbl.set(
"list_tools",
lua.create_async_function(move |lua, name: String| {
let mgr = Arc::clone(&mgr);
async move {
let result = mgr.lock().await.list_tools(&name).await;
let tbl = lua.create_table()?;
match result {
Ok(val) => {
tbl.set("ok", true)?;
let tools = val
.get("tools")
.cloned()
.unwrap_or(serde_json::Value::Array(vec![]));
tbl.set("tools", json_to_lua(&lua, tools)?)?;
}
Err(e) => {
tbl.set("ok", false)?;
tbl.set("error", e.to_string())?;
}
}
Ok(tbl)
}
})?,
)?;
}
// mcp.call(name, tool_name, arguments)
{
let mgr = Arc::clone(manager);
mcp_tbl.set(
"call",
lua.create_async_function(
move |lua, (name, tool_name, arguments): (String, String, Option<LuaValue>)| {
let mgr = Arc::clone(&mgr);
async move {
let args_json = match arguments {
Some(v) => lua_to_json(&lua, v)?,
None => serde_json::json!({}),
};
let result = mgr
.lock()
.await
.call_tool(&name, &tool_name, args_json)
.await;
let tbl = lua.create_table()?;
match result {
Ok(val) => {
tbl.set("ok", true)?;
let content = val
.get("content")
.cloned()
.unwrap_or(serde_json::Value::Array(vec![]));
tbl.set("content", json_to_lua(&lua, content)?)?;
}
Err(e) => {
tbl.set("ok", false)?;
tbl.set("error", e.to_string())?;
}
}
Ok(tbl)
}
},
)?,
)?;
}
// mcp.disconnect(name)
{
let mgr = Arc::clone(manager);
mcp_tbl.set(
"disconnect",
lua.create_async_function(move |_, name: String| {
let mgr = Arc::clone(&mgr);
async move {
mgr.lock()
.await
.disconnect(&name)
.await
.map_err(LuaError::external)
}
})?,
)?;
}
lua.globals().set("mcp", mcp_tbl)?;
Ok(())
}