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use self::JsonError::*;
use crate::json::*;
use futures::channel::oneshot::Canceled as FutureCanceled;
use serde_json::Error as SerdeError;
use std::{
error::Error,
fmt,
io::{self, Error as IoError},
option::NoneError,
};
#[derive(
Clone, Debug, PartialEq, Eq, Serialize, Deserialize, DefaultJson, Hash, PartialOrd, Ord,
)]
pub enum JsonError {
ErrorGeneric(String),
IoError(String),
SerializationError(String),
}
impl JsonError {
pub fn new(msg: &str) -> JsonError {
JsonError::ErrorGeneric(msg.to_string())
}
}
pub type JsonResult<T> = Result<T, JsonError>;
impl fmt::Display for JsonError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
ErrorGeneric(err_msg) => write!(f, "{}", err_msg),
SerializationError(err_msg) => write!(f, "{}", err_msg),
IoError(err_msg) => write!(f, "{}", err_msg),
}
}
}
impl Error for JsonError {}
impl From<JsonError> for String {
fn from(holochain_json_error: JsonError) -> Self {
holochain_json_error.to_string()
}
}
impl From<String> for JsonError {
fn from(error: String) -> Self {
JsonError::new(&error)
}
}
impl From<&'static str> for JsonError {
fn from(error: &str) -> Self {
JsonError::new(error)
}
}
fn reason_for_io_error(error: &IoError) -> String {
match error.kind() {
io::ErrorKind::InvalidData => format!("contains invalid data: {}", error),
io::ErrorKind::PermissionDenied => format!("missing permissions to read: {}", error),
_ => format!("unexpected error: {}", error),
}
}
impl<T> From<::std::sync::PoisonError<T>> for JsonError {
fn from(error: ::std::sync::PoisonError<T>) -> Self {
JsonError::ErrorGeneric(format!("sync poison error: {}", error))
}
}
impl From<IoError> for JsonError {
fn from(error: IoError) -> Self {
JsonError::IoError(reason_for_io_error(&error))
}
}
impl From<SerdeError> for JsonError {
fn from(error: SerdeError) -> Self {
JsonError::SerializationError(error.to_string())
}
}
impl From<base64::DecodeError> for JsonError {
fn from(error: base64::DecodeError) -> Self {
JsonError::ErrorGeneric(format!("base64 decode error: {}", error.to_string()))
}
}
impl From<std::str::Utf8Error> for JsonError {
fn from(error: std::str::Utf8Error) -> Self {
JsonError::ErrorGeneric(format!("std::str::Utf8Error error: {}", error.to_string()))
}
}
impl From<FutureCanceled> for JsonError {
fn from(_: FutureCanceled) -> Self {
JsonError::ErrorGeneric("Failed future".to_string())
}
}
impl From<NoneError> for JsonError {
fn from(_: NoneError) -> Self {
JsonError::ErrorGeneric("Expected Some and got None".to_string())
}
}
impl From<hcid::HcidError> for JsonError {
fn from(error: hcid::HcidError) -> Self {
JsonError::ErrorGeneric(format!("{:?}", error))
}
}
#[cfg(test)]
mod tests {
use super::*;
fn raises_json_error(yes: bool) -> JsonResult<()> {
if yes {
Err(JsonError::new("borked"))
} else {
Ok(())
}
}
#[test]
fn to_string() {
let err = JsonError::new("foo");
assert_eq!("foo", err.to_string());
}
#[test]
fn test_to_json() {
let err = JsonError::new("foo");
assert_eq!(
JsonString::from_json("{\"ErrorGeneric\":\"foo\"}"),
JsonString::from(err),
);
}
#[test]
fn can_instantiate() {
let err = JsonError::new("borked");
assert_eq!(JsonError::ErrorGeneric("borked".to_string()), err);
}
#[test]
fn can_raise_json_error() {
let err = raises_json_error(true).expect_err("should return an error when yes=true");
match err {
JsonError::ErrorGeneric(msg) => assert_eq!(msg, "borked"),
_ => panic!("raises_json_error should return an ErrorGeneric"),
};
}
#[test]
fn can_return_result() {
let result = raises_json_error(false);
assert!(result.is_ok());
}
#[test]
fn error_test() {
for (input, output) in vec![
(JsonError::ErrorGeneric(String::from("foo")), "foo"),
(JsonError::SerializationError(String::from("foo")), "foo"),
(JsonError::IoError(String::from("foo")), "foo"),
] {
assert_eq!(output, &input.to_string());
}
}
}