feldera-sqllib 0.331.0

use thiserror::Error;

/// Error that may be produced by a function at runtime
#[derive(Error, Debug)]
pub enum SqlRuntimeError {
    #[error("{0}")]
    CustomError(String),
}

impl SqlRuntimeError {
    /// Create a Boxed SqlRuntimeError from a message string
    pub fn from_string(message: String) -> Box<Self> {
        Box::new(SqlRuntimeError::CustomError(message))
    }

    /// Create a Boxed SqlRuntimeError from a message slice
    pub fn from_strng(message: &str) -> Box<Self> {
        Box::new(SqlRuntimeError::CustomError(message.to_string()))
    }
}

pub type SqlResult<T> = Result<T, Box<SqlRuntimeError>>;

#[doc(hidden)]
// Convert a SqlResult<T> into a SqlResult<Option<T>>
pub(crate) fn r2o<T>(result: SqlResult<T>) -> SqlResult<Option<T>> {
    match result {
        Err(e) => Err(e),
        Ok(value) => Ok(Some(value)),
    }
}

#[doc(hidden)]
// Convert a Result<R, E> into a SqlResult<T>
pub(crate) fn convert_error<T, E>(x: Result<T, E>) -> SqlResult<T>
where
    E: std::fmt::Display,
{
    match x {
        Ok(value) => Ok(value),
        Err(e) => Err(SqlRuntimeError::from_string(e.to_string())),
    }
}

#[doc(hidden)]
// If the data is Ok(None), convert it to Err, otherwise leave it unchanged
pub fn unwrap_sql_result<T>(data: SqlResult<Option<T>>) -> SqlResult<T> {
    match data {
        Err(e) => Err(e),
        Ok(None) => Err(SqlRuntimeError::from_strng("NULL result produced")),
        Ok(Some(data)) => Ok(data),
    }
}

#[doc(hidden)]
pub fn wrap_sql_result<T>(data: T) -> SqlResult<T> {
    Ok(data)
}