esi 0.4.0-pre3

use thiserror::Error;

use fastly::http::request::SendError;

/// Describes an error encountered during ESI parsing or execution.
#[derive(Error, Debug)]
#[allow(clippy::large_enum_variant)]
pub enum ExecutionError {
    /// Invalid XML was encountered during parsing.
    #[error("xml parsing error: {0}")]
    XMLError(#[from] quick_xml::Error),

    /// The ESI document contains a tag with a missing paraemter.
    #[error("tag `{0}` is missing required parameter `{1}`")]
    MissingRequiredParameter(String, String),

    /// The ESI document contains an opening tag without a matching closing tag.
    #[error("unexpected `{0}` closing tag")]
    UnexpectedClosingTag(String),

    // One or more of the URLs in the ESI template were invalid.
    #[error("invalid request URL provided: `{0}`")]
    InvalidRequestUrl(String),

    /// An error occurred when sending a fragment request to a backend.
    #[error("error sending request: {0}")]
    RequestError(#[from] SendError),

    /// An ESI fragment request returned an unexpected HTTP status code.
    #[error("received unexpected status code for fragment `{0}`: {1}")]
    UnexpectedStatus(String, u16),
}

pub type Result<T> = std::result::Result<T, ExecutionError>;