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use crate::v2::params::{Id, TwoPointZero};
use serde::de::Deserializer;
use serde::ser::Serializer;
use serde::{Deserialize, Serialize};
use serde_json::value::RawValue;
use std::fmt;
use thiserror::Error;
#[derive(Serialize, Deserialize, Debug, PartialEq)]
pub struct JsonRpcError<'a> {
pub jsonrpc: TwoPointZero,
#[serde(borrow)]
pub error: JsonRpcErrorObject<'a>,
pub id: Id<'a>,
}
impl<'a> fmt::Display for JsonRpcError<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", serde_json::to_string(&self).expect("infallible; qed"))
}
}
#[derive(Debug, Deserialize, Serialize, Clone)]
#[serde(deny_unknown_fields)]
pub struct JsonRpcErrorObject<'a> {
pub code: JsonRpcErrorCode,
pub message: &'a str,
#[serde(skip_serializing_if = "Option::is_none")]
#[serde(borrow)]
pub data: Option<&'a RawValue>,
}
impl<'a> From<JsonRpcErrorCode> for JsonRpcErrorObject<'a> {
fn from(code: JsonRpcErrorCode) -> Self {
Self { code, message: code.message(), data: None }
}
}
impl<'a> PartialEq for JsonRpcErrorObject<'a> {
fn eq(&self, other: &Self) -> bool {
let this_raw = self.data.map(|r| r.get());
let other_raw = self.data.map(|r| r.get());
self.code == other.code && self.message == other.message && this_raw == other_raw
}
}
pub const PARSE_ERROR_CODE: i32 = -32700;
pub const INTERNAL_ERROR_CODE: i32 = -32603;
pub const INVALID_PARAMS_CODE: i32 = -32602;
pub const INVALID_REQUEST_CODE: i32 = -32600;
pub const METHOD_NOT_FOUND_CODE: i32 = -32601;
pub const CALL_EXECUTION_FAILED_CODE: i32 = -32000;
pub const PARSE_ERROR_MSG: &str = "Parse error";
pub const INTERNAL_ERROR_MSG: &str = "Internal error";
pub const INVALID_PARAMS_MSG: &str = "Invalid params";
pub const INVALID_REQUEST_MSG: &str = "Invalid request";
pub const METHOD_NOT_FOUND_MSG: &str = "Method not found";
pub const SERVER_ERROR_MSG: &str = "Server error";
#[derive(Error, Debug, PartialEq, Copy, Clone)]
pub enum JsonRpcErrorCode {
ParseError,
InvalidRequest,
MethodNotFound,
InvalidParams,
InternalError,
ServerError(i32),
}
impl JsonRpcErrorCode {
pub const fn code(&self) -> i32 {
match *self {
JsonRpcErrorCode::ParseError => PARSE_ERROR_CODE,
JsonRpcErrorCode::InvalidRequest => INVALID_REQUEST_CODE,
JsonRpcErrorCode::MethodNotFound => METHOD_NOT_FOUND_CODE,
JsonRpcErrorCode::InvalidParams => INVALID_PARAMS_CODE,
JsonRpcErrorCode::InternalError => INTERNAL_ERROR_CODE,
JsonRpcErrorCode::ServerError(code) => code,
}
}
pub const fn message(&self) -> &'static str {
match self {
JsonRpcErrorCode::ParseError => PARSE_ERROR_MSG,
JsonRpcErrorCode::InvalidRequest => INVALID_REQUEST_MSG,
JsonRpcErrorCode::MethodNotFound => METHOD_NOT_FOUND_MSG,
JsonRpcErrorCode::InvalidParams => INVALID_PARAMS_MSG,
JsonRpcErrorCode::InternalError => INTERNAL_ERROR_MSG,
JsonRpcErrorCode::ServerError(_) => SERVER_ERROR_MSG,
}
}
}
impl fmt::Display for JsonRpcErrorCode {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}: {}", self.code(), self.message())
}
}
impl From<i32> for JsonRpcErrorCode {
fn from(code: i32) -> Self {
match code {
PARSE_ERROR_CODE => JsonRpcErrorCode::ParseError,
INVALID_REQUEST_CODE => JsonRpcErrorCode::InvalidRequest,
METHOD_NOT_FOUND_CODE => JsonRpcErrorCode::MethodNotFound,
INVALID_PARAMS_CODE => JsonRpcErrorCode::InvalidParams,
INTERNAL_ERROR_CODE => JsonRpcErrorCode::InternalError,
code => JsonRpcErrorCode::ServerError(code),
}
}
}
impl<'a> serde::Deserialize<'a> for JsonRpcErrorCode {
fn deserialize<D>(deserializer: D) -> Result<JsonRpcErrorCode, D::Error>
where
D: Deserializer<'a>,
{
let code: i32 = Deserialize::deserialize(deserializer)?;
Ok(JsonRpcErrorCode::from(code))
}
}
impl serde::Serialize for JsonRpcErrorCode {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_i32(self.code())
}
}
#[cfg(test)]
mod tests {
use super::{Id, JsonRpcError, JsonRpcErrorCode, JsonRpcErrorObject, TwoPointZero};
#[test]
fn deserialize_works() {
let ser = r#"{"jsonrpc":"2.0","error":{"code":-32700,"message":"Parse error"},"id":null}"#;
let exp = JsonRpcError {
jsonrpc: TwoPointZero,
error: JsonRpcErrorObject { code: JsonRpcErrorCode::ParseError, message: "Parse error".into(), data: None },
id: Id::Null,
};
let err: JsonRpcError = serde_json::from_str(ser).unwrap();
assert_eq!(exp, err);
}
#[test]
fn deserialize_with_optional_data() {
let ser = r#"{"jsonrpc":"2.0","error":{"code":-32700,"message":"Parse error", "data":"vegan"},"id":null}"#;
let data = serde_json::value::to_raw_value(&"vegan").unwrap();
let exp = JsonRpcError {
jsonrpc: TwoPointZero,
error: JsonRpcErrorObject {
code: JsonRpcErrorCode::ParseError,
message: "Parse error".into(),
data: Some(&*data),
},
id: Id::Null,
};
let err: JsonRpcError = serde_json::from_str(ser).unwrap();
assert_eq!(exp, err);
}
#[test]
fn serialize_works() {
let exp = r#"{"jsonrpc":"2.0","error":{"code":-32603,"message":"Internal error"},"id":1337}"#;
let err = JsonRpcError {
jsonrpc: TwoPointZero,
error: JsonRpcErrorObject { code: JsonRpcErrorCode::InternalError, message: "Internal error", data: None },
id: Id::Number(1337),
};
let ser = serde_json::to_string(&err).unwrap();
assert_eq!(exp, ser);
}
}