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|
//! A simplified version of lsp base protocol for rpc
use std::{
fmt,
io::{self, BufRead, Write},
};
use serde::{de::DeserializeOwned, Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(untagged)]
pub enum Message {
Request(Request),
Response(Response),
}
impl From<Request> for Message {
fn from(request: Request) -> Message {
Message::Request(request)
}
}
impl From<Response> for Message {
fn from(response: Response) -> Message {
Message::Response(response)
}
}
#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[serde(transparent)]
pub struct RequestId(IdRepr);
#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[serde(untagged)]
enum IdRepr {
U64(u64),
String(String),
}
impl From<u64> for RequestId {
fn from(id: u64) -> RequestId {
RequestId(IdRepr::U64(id))
}
}
impl From<String> for RequestId {
fn from(id: String) -> RequestId {
RequestId(IdRepr::String(id))
}
}
impl fmt::Display for RequestId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match &self.0 {
IdRepr::U64(it) => fmt::Display::fmt(it, f),
IdRepr::String(it) => fmt::Display::fmt(it, f),
}
}
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Request {
pub id: RequestId,
pub method: String,
pub params: serde_json::Value,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Response {
// JSON RPC allows this to be null if it was impossible
// to decode the request's id. Ignore this special case
// and just die horribly.
pub id: RequestId,
#[serde(skip_serializing_if = "Option::is_none")]
pub result: Option<serde_json::Value>,
#[serde(skip_serializing_if = "Option::is_none")]
pub error: Option<ResponseError>,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ResponseError {
pub code: i32,
pub message: String,
#[serde(skip_serializing_if = "Option::is_none")]
pub data: Option<serde_json::Value>,
}
#[derive(Clone, Copy, Debug)]
#[allow(unused)]
pub enum ErrorCode {
// Defined by JSON RPC
ParseError = -32700,
InvalidRequest = -32600,
MethodNotFound = -32601,
InvalidParams = -32602,
InternalError = -32603,
ServerErrorStart = -32099,
ServerErrorEnd = -32000,
ServerNotInitialized = -32002,
UnknownErrorCode = -32001,
// Defined by protocol
ExpansionError = -32900,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Notification {
pub method: String,
pub params: serde_json::Value,
}
impl Message {
pub fn read(r: &mut impl BufRead) -> io::Result<Option<Message>> {
let text = match read_msg_text(r)? {
None => return Ok(None),
Some(text) => text,
};
let msg = serde_json::from_str(&text)?;
Ok(Some(msg))
}
pub fn write(self, w: &mut impl Write) -> io::Result<()> {
#[derive(Serialize)]
struct JsonRpc {
jsonrpc: &'static str,
#[serde(flatten)]
msg: Message,
}
let text = serde_json::to_string(&JsonRpc { jsonrpc: "2.0", msg: self })?;
write_msg_text(w, &text)
}
}
impl Response {
pub fn new_ok<R: Serialize>(id: RequestId, result: R) -> Response {
Response { id, result: Some(serde_json::to_value(result).unwrap()), error: None }
}
pub fn new_err(id: RequestId, code: i32, message: String) -> Response {
let error = ResponseError { code, message, data: None };
Response { id, result: None, error: Some(error) }
}
}
impl Request {
pub fn new<P: Serialize>(id: RequestId, method: String, params: P) -> Request {
Request { id, method, params: serde_json::to_value(params).unwrap() }
}
pub fn extract<P: DeserializeOwned>(self, method: &str) -> Result<(RequestId, P), Request> {
if self.method == method {
let params = serde_json::from_value(self.params).unwrap_or_else(|err| {
panic!("Invalid request\nMethod: {}\n error: {}", method, err)
});
Ok((self.id, params))
} else {
Err(self)
}
}
}
impl Notification {
pub fn new(method: String, params: impl Serialize) -> Notification {
Notification { method, params: serde_json::to_value(params).unwrap() }
}
pub fn extract<P: DeserializeOwned>(self, method: &str) -> Result<P, Notification> {
if self.method == method {
let params = serde_json::from_value(self.params).unwrap();
Ok(params)
} else {
Err(self)
}
}
}
fn read_msg_text(inp: &mut impl BufRead) -> io::Result<Option<String>> {
fn invalid_data(error: impl Into<Box<dyn std::error::Error + Send + Sync>>) -> io::Error {
io::Error::new(io::ErrorKind::InvalidData, error)
}
macro_rules! invalid_data {
($($tt:tt)*) => (invalid_data(format!($($tt)*)))
}
let mut size = None;
let mut buf = String::new();
loop {
buf.clear();
if inp.read_line(&mut buf)? == 0 {
return Ok(None);
}
if !buf.ends_with("\r\n") {
return Err(invalid_data!("malformed header: {:?}", buf));
}
let buf = &buf[..buf.len() - 2];
if buf.is_empty() {
break;
}
let mut parts = buf.splitn(2, ": ");
let header_name = parts.next().unwrap();
let header_value =
parts.next().ok_or_else(|| invalid_data!("malformed header: {:?}", buf))?;
if header_name == "Content-Length" {
size = Some(header_value.parse::<usize>().map_err(invalid_data)?);
}
}
let size: usize = size.ok_or_else(|| invalid_data!("no Content-Length"))?;
let mut buf = buf.into_bytes();
buf.resize(size, 0);
inp.read_exact(&mut buf)?;
let buf = String::from_utf8(buf).map_err(invalid_data)?;
log::debug!("< {}", buf);
Ok(Some(buf))
}
fn write_msg_text(out: &mut impl Write, msg: &str) -> io::Result<()> {
log::debug!("> {}", msg);
write!(out, "Content-Length: {}\r\n\r\n", msg.len())?;
out.write_all(msg.as_bytes())?;
out.flush()?;
Ok(())
}
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