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use std::io::{BufRead, Write};
use lsp_types::{notification::Notification, request::Request};
use serde::{Deserialize, Serialize};
use serde_json::{from_str, from_value, to_string, to_value, Value};
use failure::{bail, format_err};
use crate::Result;
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(untagged)]
pub enum RawMessage {
Request(RawRequest),
Notification(RawNotification),
Response(RawResponse),
}
impl From<RawRequest> for RawMessage {
fn from(raw: RawRequest) -> RawMessage {
RawMessage::Request(raw)
}
}
impl From<RawNotification> for RawMessage {
fn from(raw: RawNotification) -> RawMessage {
RawMessage::Notification(raw)
}
}
impl From<RawResponse> for RawMessage {
fn from(raw: RawResponse) -> RawMessage {
RawMessage::Response(raw)
}
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct RawRequest {
pub id: u64,
pub method: String,
pub params: Value,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct RawResponse {
// 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: u64,
#[serde(skip_serializing_if = "Option::is_none")]
pub result: Option<Value>,
#[serde(skip_serializing_if = "Option::is_none")]
pub error: Option<RawResponseError>,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct RawResponseError {
pub code: i32,
pub message: String,
#[serde(skip_serializing_if = "Option::is_none")]
pub data: Option<Value>,
}
#[derive(Clone, Copy, Debug)]
#[allow(unused)]
pub enum ErrorCode {
ParseError = -32700,
InvalidRequest = -32600,
MethodNotFound = -32601,
InvalidParams = -32602,
InternalError = -32603,
ServerErrorStart = -32099,
ServerErrorEnd = -32000,
ServerNotInitialized = -32002,
UnknownErrorCode = -32001,
RequestCanceled = -32800,
ContentModified = -32801,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct RawNotification {
pub method: String,
pub params: Value,
}
impl RawMessage {
pub fn read(r: &mut impl BufRead) -> Result<Option<RawMessage>> {
let text = match read_msg_text(r)? {
None => return Ok(None),
Some(text) => text,
};
let msg = from_str(&text)?;
Ok(Some(msg))
}
pub fn write(self, w: &mut impl Write) -> Result<()> {
#[derive(Serialize)]
struct JsonRpc {
jsonrpc: &'static str,
#[serde(flatten)]
msg: RawMessage,
}
let text = to_string(&JsonRpc { jsonrpc: "2.0", msg: self })?;
write_msg_text(w, &text)?;
Ok(())
}
}
impl RawRequest {
pub fn new<R>(id: u64, params: &R::Params) -> RawRequest
where
R: Request,
R::Params: serde::Serialize,
{
RawRequest { id, method: R::METHOD.to_string(), params: to_value(params).unwrap() }
}
pub fn cast<R>(self) -> ::std::result::Result<(u64, R::Params), RawRequest>
where
R: Request,
R::Params: serde::de::DeserializeOwned,
{
if self.method != R::METHOD {
return Err(self);
}
let id = self.id;
let params: R::Params = from_value(self.params).unwrap();
Ok((id, params))
}
}
impl RawResponse {
pub fn ok<R>(id: u64, result: &R::Result) -> RawResponse
where
R: Request,
R::Result: serde::Serialize,
{
RawResponse { id, result: Some(to_value(&result).unwrap()), error: None }
}
pub fn err(id: u64, code: i32, message: String) -> RawResponse {
let error = RawResponseError { code, message, data: None };
RawResponse { id, result: None, error: Some(error) }
}
}
impl RawNotification {
pub fn new<N>(params: &N::Params) -> RawNotification
where
N: Notification,
N::Params: serde::Serialize,
{
RawNotification { method: N::METHOD.to_string(), params: to_value(params).unwrap() }
}
pub fn is<N>(&self) -> bool
where
N: Notification,
{
self.method == N::METHOD
}
pub fn cast<N>(self) -> ::std::result::Result<N::Params, RawNotification>
where
N: Notification,
N::Params: serde::de::DeserializeOwned,
{
if !self.is::<N>() {
return Err(self);
}
Ok(from_value(self.params).unwrap())
}
}
fn read_msg_text(inp: &mut impl BufRead) -> Result<Option<String>> {
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") {
bail!("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(|| format_err!("malformed header: {:?}", buf))?;
if header_name == "Content-Length" {
size = Some(header_value.parse::<usize>()?);
}
}
let size = size.ok_or_else(|| format_err!("no Content-Length"))?;
let mut buf = buf.into_bytes();
buf.resize(size, 0);
inp.read_exact(&mut buf)?;
let buf = String::from_utf8(buf)?;
log::debug!("< {}", buf);
Ok(Some(buf))
}
fn write_msg_text(out: &mut impl Write, msg: &str) -> 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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