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pub mod angreal;
pub mod mcp;
use anyhow::Result;
use mcp::{JsonRpcRequest, JsonRpcResponse, McpServer};
use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
#[tokio::main]
async fn main() -> Result<()> {
let server = McpServer::new();
let stdin = tokio::io::stdin();
let mut stdout = tokio::io::stdout();
let mut reader = BufReader::new(stdin);
eprintln!("Angreal MCP server started");
let mut line = String::new();
loop {
line.clear();
match reader.read_line(&mut line).await {
Ok(0) => {
eprintln!("EOF received, shutting down");
break;
}
Ok(_) => {
let trimmed = line.trim();
if trimmed.is_empty() {
continue;
}
match serde_json::from_str::<JsonRpcRequest>(trimmed) {
Ok(request) => {
eprintln!("Received request: {}", request.method);
match server.handle_request(request).await {
Ok(response) => {
let response_str = serde_json::to_string(&response)?;
stdout.write_all(response_str.as_bytes()).await?;
stdout.write_all(b"\n").await?;
stdout.flush().await?;
}
Err(e) => {
eprintln!("Error handling request: {}", e);
let error_response = JsonRpcResponse {
jsonrpc: "2.0".to_string(),
id: None,
result: None,
error: Some(mcp::JsonRpcError {
code: -32603,
message: "Internal error".to_string(),
data: Some(serde_json::json!({
"details": e.to_string()
})),
}),
};
let response_str = serde_json::to_string(&error_response)?;
stdout.write_all(response_str.as_bytes()).await?;
stdout.write_all(b"\n").await?;
stdout.flush().await?;
}
}
}
Err(e) => {
eprintln!("Failed to parse JSON-RPC request: {}", e);
let error_response = JsonRpcResponse {
jsonrpc: "2.0".to_string(),
id: None,
result: None,
error: Some(mcp::JsonRpcError {
code: -32700,
message: "Parse error".to_string(),
data: None,
}),
};
let response_str = serde_json::to_string(&error_response)?;
stdout.write_all(response_str.as_bytes()).await?;
stdout.write_all(b"\n").await?;
stdout.flush().await?;
}
}
}
Err(e) => {
eprintln!("Error reading from stdin: {}", e);
break;
}
}
}
Ok(())
}