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use std::marker::PhantomData;
use serde::{
ser::Serialize,
de::DeserializeOwned,
};
use serde_json;
use drop_bomb::DropBomb;
use ::{
Result,
req::{ClientRequest, Notification},
io::{RawResponse, RawRequest, RawNotification},
};
pub struct Responder<R: ClientRequest> {
id: u64,
bomb: DropBomb,
ph: PhantomData<fn(R)>,
}
impl<R: ClientRequest> Responder<R> {
pub fn into_response(mut self, result: Result<R::Result>) -> Result<RawResponse> {
self.bomb.defuse();
let res = match result {
Ok(result) => {
RawResponse {
id: self.id,
result: serde_json::to_value(result)?,
error: serde_json::Value::Null,
}
}
Err(e) => {
error_response(
self.id,
ErrorCode::InternalError,
format!("internal error: {}", e),
)?
}
};
Ok(res)
}
}
fn parse_request_as<R: ClientRequest>(raw: RawRequest)
-> Result<::std::result::Result<(R::Params, Responder<R>), RawRequest>>
{
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 handle_request<R, F>(req: RawRequest, f: F) -> Result<::std::result::Result<u64, RawRequest>>
where
R: ClientRequest,
F: FnOnce(R::Params, Responder<R>) -> Result<()>
{
let id = req.id;
match parse_request_as::<R>(req)? {
Ok((params, responder)) => {
let () = f(params, responder)?;
Ok(Ok(id))
},
Err(r) => Ok(Err(r)),
}
}
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 send_notification<N>(params: N::Params) -> RawNotification
where
N: Notification,
N::Params: Serialize
{
RawNotification {
method: N::METHOD.to_string(),
params: serde_json::to_value(params)
.unwrap(),
}
}
pub fn unknown_method(id: u64) -> Result<RawResponse> {
error_response(id, ErrorCode::MethodNotFound, "unknown method")
}
fn error_response(id: u64, code: ErrorCode, message: impl Into<String>) -> Result<RawResponse> {
#[derive(Serialize)]
struct Error {
code: i32,
message: String,
}
let resp = RawResponse {
id,
result: serde_json::Value::Null,
error: serde_json::to_value(Error {
code: code as i32,
message: message.into(),
})?,
};
Ok(resp)
}
#[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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