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//! Crate-specific errors (using `failure`)
//!
//! The justification for this complexity is that we need to return correct HTTP error types as
//! well as helpful error messages in API responses.
// Design goals:
// - be able to call '?' on random things and collect them in endpoint handlers
// - be able to 'bail!()' and 'ensure!()' and have those end up as InternalErrors
// - do conversion into ErrorResponse model in this file, not endpoint handlers, and ErrorReponse
// should have good context about the error
//
// Plan:
// - use .map_err() to convert to the correct type
// - map to
pub use failure::Error;
use failure::Fail;
use fatcat_api_spec::models;
use std::result;
/// A type alias for handling errors throughout this crate
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug, Fail, Clone)]
pub enum FatcatError {
#[fail(display = "no such {} found: {}", _0, _1)]
NotFound(String, String),
#[fail(
display = "invalid fatcat identifier (expect 26-char base32 encoded): {}",
_0
)]
InvalidFatcatId(String),
#[fail(
display = "external identifier doesn't match required pattern for a {}: {}",
_0, _1
)]
MalformedExternalId(String, String),
#[fail(
display = "checksum doesn't match required pattern ({} in hex encoding): {}",
_0, _1
)]
MalformedChecksum(String, String),
#[fail(display = "not a valid UUID: {}", _0)]
MalformedUuid(String),
#[fail(display = "'{}' is not a an known/acceptable '{}' value", _1, _0)]
NotInControlledVocabulary(String, String), // vocab, word
#[fail(
display = "attempted to accept or mutate an editgroup which was already accepted: {}",
_0
)]
EditgroupAlreadyAccepted(String),
#[fail(
display = "external identifiers missing or multiple specified; please supply exactly one: {}",
_0
)]
MissingOrMultipleExternalId(String),
#[fail(display = "tried to mutate an entity into impossible state: {}", _0)]
InvalidEntityStateTransform(String),
#[fail(
display = "auth token was missing, expired, revoked, or corrupt: {}",
_0
)]
InvalidCredentials(String),
#[fail(display = "editor account doesn't have authorization: {}", _0)]
InsufficientPrivileges(String),
#[fail(
display = "broke a constraint or made an otherwise invalid request: {}",
_0
)]
// Utf8Decode, StringDecode, Uuid
BadRequest(String),
#[fail(display = "unexpected database error: {}", _0)]
// Diesel constraint that we think is a user error
ConstraintViolation(String),
#[fail(display = "generic database 'not-found'")]
// This should generally get caught and handled
DatabaseRowNotFound,
// TODO: can these hold context instead of Inner?
#[fail(display = "unexpected database error: {}", _0)]
// other Diesel, R2d2 errors which we don't think are user errors (eg, connection failure)
DatabaseError(String),
#[fail(display = "unexpected internal error: {}", _0)]
// Fmt, Io, Serde,
InternalError(String),
} // NOTE: this enum is not exhaustive and shouldn't be matched over!
impl Into<models::ErrorResponse> for FatcatError {
/// Format an error as an API response (ErrorResponse model, used by all HTTP 4xx and 5xx
/// responses)
fn into(self) -> models::ErrorResponse {
// TODO: something more complex? context?
models::ErrorResponse {
success: false,
// enum variant name, without fields. whew, what a pile
error: format!("{:?}", self).split('(').collect::<Vec<&str>>()[0].to_string(),
message: self.to_string(),
}
}
}
impl From<diesel::result::Error> for FatcatError {
fn from(inner: diesel::result::Error) -> FatcatError {
match inner {
diesel::result::Error::NotFound => FatcatError::DatabaseRowNotFound,
diesel::result::Error::DatabaseError(_, _) => {
FatcatError::ConstraintViolation(inner.to_string())
}
_ => FatcatError::InternalError(inner.to_string()),
}
}
}
impl From<std::fmt::Error> for FatcatError {
fn from(inner: std::fmt::Error) -> FatcatError {
FatcatError::InternalError(inner.to_string())
}
}
impl From<diesel::r2d2::Error> for FatcatError {
fn from(inner: diesel::r2d2::Error) -> FatcatError {
FatcatError::InternalError(inner.to_string())
}
}
impl From<uuid::ParseError> for FatcatError {
fn from(inner: uuid::ParseError) -> FatcatError {
FatcatError::MalformedUuid(inner.to_string())
}
}
impl From<serde_json::Error> for FatcatError {
fn from(inner: serde_json::Error) -> FatcatError {
FatcatError::InternalError(inner.to_string())
}
}
impl From<std::string::FromUtf8Error> for FatcatError {
fn from(inner: std::string::FromUtf8Error) -> FatcatError {
FatcatError::InternalError(inner.to_string())
}
}
impl From<data_encoding::DecodeError> for FatcatError {
fn from(inner: data_encoding::DecodeError) -> FatcatError {
FatcatError::InternalError(inner.to_string())
}
}
// A big catchall!
impl From<failure::Error> for FatcatError {
fn from(error: failure::Error) -> FatcatError {
// TODO: I think it should be possible to match here? regardless, this is *super* janky
if let Some(_) = error.downcast_ref::<FatcatError>() {
return error.downcast::<FatcatError>().unwrap();
}
if let Some(_) = error.downcast_ref::<std::fmt::Error>() {
return error.downcast::<std::fmt::Error>().unwrap().into();
}
if let Some(_) = error.downcast_ref::<diesel::result::Error>() {
return error.downcast::<diesel::result::Error>().unwrap().into();
}
if let Some(_) = error.downcast_ref::<uuid::ParseError>() {
return error.downcast::<uuid::ParseError>().unwrap().into();
}
FatcatError::InternalError(error.to_string())
}
}
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