async-jsonrpc-client 0.1.2

use std::{error, fmt};

use serde::{Deserialize, Deserializer, Serialize, Serializer};

use crate::types::Value;

/// JSON-RPC error code
#[derive(Debug, PartialEq, Clone)]
pub enum ErrorCode {
    /// Invalid JSON was received by the server.
    /// An error occurred on the server while parsing the JSON text.
    ParseError,
    /// The JSON sent is not a valid Request object.
    InvalidRequest,
    /// The method does not exist / is not available.
    MethodNotFound,
    /// Invalid method parameter(s).
    InvalidParams,
    /// Internal JSON-RPC error.
    InternalError,
    /// Reserved for implementation-defined server-errors.
    ServerError(i64),
}

impl ErrorCode {
    /// Returns integer code value
    pub fn code(&self) -> i64 {
        match *self {
            ErrorCode::ParseError => -32700,
            ErrorCode::InvalidRequest => -32600,
            ErrorCode::MethodNotFound => -32601,
            ErrorCode::InvalidParams => -32602,
            ErrorCode::InternalError => -32603,
            ErrorCode::ServerError(code) => code,
        }
    }

    /// Returns human-readable description
    pub fn description(&self) -> String {
        let desc = match *self {
            ErrorCode::ParseError => "Parse error",
            ErrorCode::InvalidRequest => "Invalid request",
            ErrorCode::MethodNotFound => "Method not found",
            ErrorCode::InvalidParams => "Invalid params",
            ErrorCode::InternalError => "Internal error",
            ErrorCode::ServerError(_) => "Server error",
        };
        desc.to_string()
    }
}

impl From<i64> for ErrorCode {
    fn from(code: i64) -> Self {
        match code {
            -32700 => ErrorCode::ParseError,
            -32600 => ErrorCode::InvalidRequest,
            -32601 => ErrorCode::MethodNotFound,
            -32602 => ErrorCode::InvalidParams,
            -32603 => ErrorCode::InternalError,
            code => ErrorCode::ServerError(code),
        }
    }
}

impl Serialize for ErrorCode {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_i64(self.code())
    }
}

impl<'de> Deserialize<'de> for ErrorCode {
    fn deserialize<D>(deserializer: D) -> Result<ErrorCode, D::Error>
    where
        D: Deserializer<'de>,
    {
        let code: i64 = Deserialize::deserialize(deserializer)?;
        Ok(ErrorCode::from(code))
    }
}

/// Error object as defined in Spec
#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub struct Error {
    /// Code
    pub code: ErrorCode,
    /// Message
    pub message: String,
    /// Optional data
    #[serde(skip_serializing_if = "Option::is_none")]
    pub data: Option<Value>,
}

impl Error {
    /// Wraps given `ErrorCode`
    pub fn new(code: ErrorCode) -> Self {
        Error {
            message: code.description(),
            code,
            data: None,
        }
    }

    /// Creates new `ParseError`
    pub fn parse_error() -> Self {
        Self::new(ErrorCode::ParseError)
    }

    /// Creates new `InvalidRequest`
    pub fn invalid_request() -> Self {
        Self::new(ErrorCode::InvalidRequest)
    }

    /// Creates new `MethodNotFound`
    pub fn method_not_found() -> Self {
        Self::new(ErrorCode::MethodNotFound)
    }

    /// Creates new `InvalidParams`
    pub fn invalid_params<M>(message: M) -> Self
    where
        M: Into<String>,
    {
        Error {
            code: ErrorCode::InvalidParams,
            message: message.into(),
            data: None,
        }
    }

    /// Creates `InvalidParams` for given parameter, with details.
    pub fn invalid_params_with_details<M, T>(message: M, details: T) -> Error
    where
        M: Into<String>,
        T: fmt::Debug,
    {
        Error {
            code: ErrorCode::InvalidParams,
            message: format!("Invalid parameters: {}", message.into()),
            data: Some(Value::String(format!("{:?}", details))),
        }
    }

    /// Creates new `InternalError`
    pub fn internal_error() -> Self {
        Self::new(ErrorCode::InternalError)
    }

    /// Creates new `InvalidRequest` with invalid version description
    pub fn invalid_version() -> Self {
        Error {
            code: ErrorCode::InvalidRequest,
            message: "Unsupported JSON-RPC protocol version".to_owned(),
            data: None,
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}: {}", self.code.description(), self.message)
    }
}

impl error::Error for Error {}