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use std::marker::PhantomData;
use serde::{
ser::Serialize,
de::DeserializeOwned,
};
use serde_json;
use drop_bomb::DropBomb;
use ::{
Result,
req::{Request, Notification},
io::{Io, RawMsg, RawResponse, RawRequest, RawNotification},
};
pub struct Responder<R: Request> {
id: u64,
bomb: DropBomb,
ph: PhantomData<R>,
}
impl<R: Request> Responder<R>
where
R::Params: DeserializeOwned,
R::Result: Serialize,
{
pub fn response(self, io: &mut Io, resp: Result<R::Result>) -> Result<()> {
match resp {
Ok(res) => self.result(io, res)?,
Err(e) => {
self.error(io)?;
return Err(e);
}
}
Ok(())
}
pub fn result(mut self, io: &mut Io, result: R::Result) -> Result<()> {
self.bomb.defuse();
io.send(RawMsg::Response(RawResponse {
id: Some(self.id),
result: serde_json::to_value(result)?,
error: serde_json::Value::Null,
}));
Ok(())
}
pub fn error(mut self, io: &mut Io) -> Result<()> {
self.bomb.defuse();
error(io, self.id, ErrorCode::InternalError, "internal error")
}
}
pub fn parse_request_as<R>(raw: RawRequest) -> Result<::std::result::Result<(R::Params, Responder<R>), RawRequest>>
where
R: Request,
R::Params: DeserializeOwned,
R::Result: Serialize,
{
if raw.method != R::METHOD {
return Ok(Err(raw));
}
let params: R::Params = serde_json::from_value(raw.params)?;
let responder = Responder {
id: raw.id,
bomb: DropBomb::new("dropped request"),
ph: PhantomData,
};
Ok(Ok((params, responder)))
}
pub fn expect_request<R>(io: &mut Io, raw: RawRequest) -> Result<Option<(R::Params, Responder<R>)>>
where
R: Request,
R::Params: DeserializeOwned,
R::Result: Serialize,
{
let ret = match parse_request_as::<R>(raw)? {
Ok(x) => Some(x),
Err(raw) => {
unknown_method(io, raw)?;
None
}
};
Ok(ret)
}
pub fn parse_notification_as<N>(raw: RawNotification) -> Result<::std::result::Result<N::Params, RawNotification>>
where
N: Notification,
N::Params: DeserializeOwned,
{
if raw.method != N::METHOD {
return Ok(Err(raw));
}
let params: N::Params = serde_json::from_value(raw.params)?;
Ok(Ok(params))
}
pub fn handle_notification<N, F>(not: &mut Option<RawNotification>, f: F) -> Result<()>
where
N: Notification,
N::Params: DeserializeOwned,
F: FnOnce(N::Params) -> Result<()>
{
match not.take() {
None => Ok(()),
Some(n) => match parse_notification_as::<N>(n)? {
Ok(params) => f(params),
Err(n) => {
*not = Some(n);
Ok(())
},
}
}
}
pub fn unknown_method(io: &mut Io, raw: RawRequest) -> Result<()> {
error(io, raw.id, ErrorCode::MethodNotFound, "unknown method")
}
fn error(io: &mut Io, id: u64, code: ErrorCode, message: &'static str) -> Result<()> {
#[derive(Serialize)]
struct Error {
code: i32,
message: &'static str,
}
io.send(RawMsg::Response(RawResponse {
id: Some(id),
result: serde_json::Value::Null,
error: serde_json::to_value(Error {
code: code as i32,
message,
})?,
}));
Ok(())
}
#[allow(unused)]
enum ErrorCode {
ParseError = -32700,
InvalidRequest = -32600,
MethodNotFound = -32601,
InvalidParams = -32602,
InternalError = -32603,
ServerErrorStart = -32099,
ServerErrorEnd = -32000,
ServerNotInitialized = -32002,
UnknownErrorCode = -32001,
RequestCancelled = -32800,
}
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