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use std::io;
use std::sync::PoisonError;
use lmdb;
#[derive(Debug, Fail)]
pub enum Error {
#[fail(display = "Error in LMDB: {}", _0)]
LMDB(#[cause] lmdb::Error),
#[fail(display = "IO error: {}", _0)]
IO(#[cause] io::Error),
#[fail(display = "Requested bucket doesn't exist")]
InvalidBucket,
#[fail(display = "Requested key doesn't exist")]
NotFound,
#[fail(display = "Cannot write in a ReadOnly transaction")]
ReadOnly,
#[fail(display = "Could not encode or decode value")]
InvalidEncoding,
#[fail(display = "Configuration is invalid")]
InvalidConfiguration,
#[fail(display = "Directory doesn't exist")]
DirectoryNotFound,
#[fail(display = "RwLock is poisoned")]
Poison,
}
impl From<lmdb::Error> for Error {
fn from(err: lmdb::Error) -> Error {
match err {
lmdb::Error::NotFound => Error::NotFound,
lmdb::Error::BadDbi => Error::InvalidBucket,
lmdb::Error::Other(2) => Error::DirectoryNotFound,
_ => Error::LMDB(err),
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::IO(err)
}
}
impl<T> From<PoisonError<T>> for Error {
fn from(_: PoisonError<T>) -> Error {
Error::Poison
}
}
impl Error {
pub fn key_exists_error(&self) -> bool {
match self {
Error::LMDB(lmdb::Error::KeyExist) => true,
_ => false,
}
}
}