348 lines
9.5 KiB
Rust
348 lines
9.5 KiB
Rust
use std::collections::BTreeMap;
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use std::fmt::{self, Debug, Display, Formatter};
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use std::marker::PhantomData;
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use serde::{Deserialize, Serialize};
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use thiserror::Error;
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use crate::{parser, InputType, Pos, Value};
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/// Extensions to the error.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
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#[serde(transparent)]
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pub struct ErrorExtensionValues(BTreeMap<String, Value>);
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impl ErrorExtensionValues {
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/// Set an extension value.
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pub fn set(&mut self, name: impl AsRef<str>, value: impl Into<Value>) {
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self.0.insert(name.as_ref().to_string(), value.into());
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}
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}
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/// An error in a GraphQL server.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct ServerError {
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/// An explanatory message of the error.
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pub message: String,
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/// Where the error occurred.
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#[serde(skip_serializing_if = "Vec::is_empty", default)]
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pub locations: Vec<Pos>,
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/// If the error occurred in a resolver, the path to the error.
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#[serde(skip_serializing_if = "Vec::is_empty", default)]
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pub path: Vec<PathSegment>,
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/// Extensions to the error.
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#[serde(skip_serializing_if = "error_extensions_is_empty", default)]
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pub extensions: Option<ErrorExtensionValues>,
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}
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fn error_extensions_is_empty(values: &Option<ErrorExtensionValues>) -> bool {
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values.as_ref().map_or(true, |values| values.0.is_empty())
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}
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impl ServerError {
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/// Create a new server error with the message.
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pub fn new(message: impl Into<String>) -> Self {
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Self {
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message: message.into(),
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locations: Vec::new(),
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path: Vec::new(),
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extensions: None,
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}
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}
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/// Add a position to the error.
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pub fn at(mut self, at: Pos) -> Self {
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self.locations.push(at);
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self
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}
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/// Prepend a path to the error.
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pub fn path(mut self, path: PathSegment) -> Self {
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self.path.insert(0, path);
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self
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}
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}
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impl Display for ServerError {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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f.write_str(&self.message)
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}
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}
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impl From<ServerError> for Vec<ServerError> {
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fn from(single: ServerError) -> Self {
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vec![single]
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}
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}
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impl From<Error> for ServerError {
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fn from(e: Error) -> Self {
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e.into_server_error()
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}
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}
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impl From<parser::Error> for ServerError {
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fn from(e: parser::Error) -> Self {
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Self {
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message: e.to_string(),
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locations: e.positions().collect(),
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path: Vec::new(),
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extensions: None,
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}
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}
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}
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/// A segment of path to a resolver.
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///
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/// This is like [`QueryPathSegment`](enum.QueryPathSegment.html), but owned and used as a part of
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/// errors instead of during execution.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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#[serde(untagged)]
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pub enum PathSegment {
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/// A field in an object.
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Field(String),
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/// An index in a list.
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Index(usize),
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}
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/// Alias for `Result<T, ServerError>`.
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pub type ServerResult<T> = std::result::Result<T, ServerError>;
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/// An error parsing an input value.
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///
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/// This type is generic over T as it uses T's type name when converting to a regular error.
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#[derive(Debug)]
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pub struct InputValueError<T> {
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message: String,
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phantom: PhantomData<T>,
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}
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impl<T: InputType> InputValueError<T> {
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fn new(message: String) -> Self {
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Self {
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message,
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phantom: PhantomData,
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}
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}
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/// The expected input type did not match the actual input type.
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#[must_use]
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pub fn expected_type(actual: Value) -> Self {
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Self::new(format!(
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r#"Expected input type "{}", found {}."#,
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T::type_name(),
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actual
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))
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}
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/// A custom error message.
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///
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/// Any type that implements `Display` is automatically converted to this if you use the `?`
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/// operator.
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#[must_use]
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pub fn custom(msg: impl Display) -> Self {
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Self::new(format!(r#"Failed to parse "{}": {}"#, T::type_name(), msg))
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}
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/// Propagate the error message to a different type.
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pub fn propagate<U: InputType>(self) -> InputValueError<U> {
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if T::type_name() != U::type_name() {
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InputValueError::new(format!(
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r#"{} (occurred while parsing "{}")"#,
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self.message,
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U::type_name()
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))
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} else {
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InputValueError::new(self.message)
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}
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}
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/// Convert the error into a server error.
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pub fn into_server_error(self) -> ServerError {
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ServerError::new(self.message)
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}
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}
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impl<T: InputType, E: Display> From<E> for InputValueError<T> {
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fn from(error: E) -> Self {
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Self::custom(error)
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}
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}
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/// An error parsing a value of type `T`.
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pub type InputValueResult<T> = Result<T, InputValueError<T>>;
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/// An error with a message and optional extensions.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
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pub struct Error {
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/// The error message.
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pub message: String,
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/// Extensions to the error.
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#[serde(skip_serializing_if = "error_extensions_is_empty")]
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pub extensions: Option<ErrorExtensionValues>,
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}
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impl Error {
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/// Create an error from the given error message.
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pub fn new(message: impl Into<String>) -> Self {
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Self {
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message: message.into(),
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extensions: None,
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}
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}
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/// Convert the error to a server error.
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#[must_use]
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pub fn into_server_error(self) -> ServerError {
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ServerError {
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message: self.message,
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locations: Vec::new(),
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path: Vec::new(),
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extensions: self.extensions,
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}
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}
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}
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impl<T: Display> From<T> for Error {
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fn from(e: T) -> Self {
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Self {
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message: e.to_string(),
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extensions: None,
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}
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}
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}
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/// An alias for `Result<T, Error>`.
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pub type Result<T, E = Error> = std::result::Result<T, E>;
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/// An error parsing the request.
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#[derive(Debug, Error)]
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#[non_exhaustive]
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pub enum ParseRequestError {
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/// An IO error occurred.
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#[error("{0}")]
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Io(#[from] std::io::Error),
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/// The request's syntax was invalid.
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#[error("Invalid request: {0}")]
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InvalidRequest(serde_json::Error),
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/// The request's files map was invalid.
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#[error("Invalid files map: {0}")]
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InvalidFilesMap(serde_json::Error),
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/// The request's multipart data was invalid.
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#[error("Invalid multipart data")]
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#[cfg(feature = "multipart")]
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#[cfg_attr(feature = "nightly", doc(cfg(feature = "multipart")))]
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InvalidMultipart(multer::Error),
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/// Missing "operators" part for multipart request.
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#[error("Missing \"operators\" part")]
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MissingOperatorsPart,
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/// Missing "map" part for multipart request.
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#[error("Missing \"map\" part")]
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MissingMapPart,
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/// It's not an upload operation
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#[error("It's not an upload operation")]
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NotUpload,
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/// Files were missing the request.
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#[error("Missing files")]
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MissingFiles,
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/// The request's payload is too large, and this server rejected it.
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#[error("Payload too large")]
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PayloadTooLarge,
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/// The request is a batch request, but the server does not support batch requests.
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#[error("Batch requests are not supported")]
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UnsupportedBatch,
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}
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#[cfg(feature = "multipart")]
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impl From<multer::Error> for ParseRequestError {
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fn from(err: multer::Error) -> Self {
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match err {
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multer::Error::FieldSizeExceeded { .. } | multer::Error::StreamSizeExceeded { .. } => {
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ParseRequestError::PayloadTooLarge
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}
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_ => ParseRequestError::InvalidMultipart(err),
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}
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}
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}
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/// An error which can be extended into a `Error`.
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pub trait ErrorExtensions: Sized {
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/// Convert the error to a `Error`.
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fn extend(&self) -> Error;
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/// Add extensions to the error, using a callback to make the extensions.
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fn extend_with<C>(self, cb: C) -> Error
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where
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C: FnOnce(&Self, &mut ErrorExtensionValues),
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{
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let message = self.extend().message;
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let mut extensions = self.extend().extensions.unwrap_or_default();
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cb(&self, &mut extensions);
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Error {
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message,
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extensions: Some(extensions),
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}
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}
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}
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impl ErrorExtensions for Error {
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fn extend(&self) -> Error {
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self.clone()
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}
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}
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// implementing for &E instead of E gives the user the possibility to implement for E which does
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// not conflict with this implementation acting as a fallback.
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impl<E: std::fmt::Display> ErrorExtensions for &E {
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fn extend(&self) -> Error {
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Error {
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message: self.to_string(),
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extensions: None,
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}
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}
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}
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/// Extend a `Result`'s error value with [`ErrorExtensions`](trait.ErrorExtensions.html).
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pub trait ResultExt<T, E>: Sized {
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/// Extend the error value of the result with the callback.
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fn extend_err<C>(self, cb: C) -> Result<T>
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where
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C: FnOnce(&E, &mut ErrorExtensionValues);
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/// Extend the result to a `Result`.
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fn extend(self) -> Result<T>;
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}
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// This is implemented on E and not &E which means it cannot be used on foreign types.
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// (see example).
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impl<T, E> ResultExt<T, E> for std::result::Result<T, E>
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where
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E: ErrorExtensions + Send + Sync + 'static,
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{
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fn extend_err<C>(self, cb: C) -> Result<T>
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where
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C: FnOnce(&E, &mut ErrorExtensionValues),
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{
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match self {
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Err(err) => Err(err.extend_with(|e, ee| cb(e, ee))),
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Ok(value) => Ok(value),
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}
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}
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fn extend(self) -> Result<T> {
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match self {
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Err(err) => Err(err.extend()),
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Ok(value) => Ok(value),
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}
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}
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}
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