lemmy/crates/utils/src/error.rs

122 lines
2.9 KiB
Rust
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use std::{
fmt,
fmt::{Debug, Display},
};
use tracing_error::SpanTrace;
#[derive(serde::Serialize)]
struct ApiError {
error: String,
}
pub type LemmyResult<T> = Result<T, LemmyError>;
pub struct LemmyError {
pub message: Option<String>,
pub inner: anyhow::Error,
pub context: SpanTrace,
}
impl LemmyError {
/// Create LemmyError from a message, including stack trace
pub fn from_message(message: &str) -> Self {
let inner = anyhow::anyhow!("{}", message);
LemmyError {
message: Some(message.into()),
inner,
context: SpanTrace::capture(),
}
}
/// Create a LemmyError from error and message, including stack trace
pub fn from_error_message<E>(error: E, message: &str) -> Self
where
E: Into<anyhow::Error>,
{
LemmyError {
message: Some(message.into()),
inner: error.into(),
context: SpanTrace::capture(),
}
}
/// Add message to existing LemmyError (or overwrite existing error)
pub fn with_message(self, message: &str) -> Self {
LemmyError {
message: Some(message.into()),
..self
}
}
pub fn to_json(&self) -> Result<String, Self> {
let api_error = match &self.message {
Some(error) => ApiError {
error: error.into(),
},
None => ApiError {
error: "Unknown".into(),
},
};
Ok(serde_json::to_string(&api_error)?)
}
}
impl<T> From<T> for LemmyError
where
T: Into<anyhow::Error>,
{
fn from(t: T) -> Self {
LemmyError {
message: None,
inner: t.into(),
context: SpanTrace::capture(),
}
}
}
impl Debug for LemmyError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("LemmyError")
.field("message", &self.message)
.field("inner", &self.inner)
.field("context", &self.context)
.finish()
}
}
impl Display for LemmyError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if let Some(message) = &self.message {
write!(f, "{message}: ")?;
}
// print anyhow including trace
// https://docs.rs/anyhow/latest/anyhow/struct.Error.html#display-representations
// this will print the anyhow trace (only if it exists)
// and if RUST_BACKTRACE=1, also a full backtrace
writeln!(f, "{:?}", self.inner)?;
fmt::Display::fmt(&self.context, f)
}
}
impl actix_web::error::ResponseError for LemmyError {
fn status_code(&self) -> http::StatusCode {
match self.inner.downcast_ref::<diesel::result::Error>() {
Some(diesel::result::Error::NotFound) => http::StatusCode::NOT_FOUND,
_ => http::StatusCode::BAD_REQUEST,
}
}
fn error_response(&self) -> actix_web::HttpResponse {
if let Some(message) = &self.message {
actix_web::HttpResponse::build(self.status_code()).json(ApiError {
error: message.into(),
})
} else {
actix_web::HttpResponse::build(self.status_code())
.content_type("text/plain")
.body(self.inner.to_string())
}
}
}