Mercurial > lbo > hg > sstable
view src/types.rs @ 38:5f4219f141ba
types: Remove FileMetaData
author | Lewin Bormann <lbo@spheniscida.de> |
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date | Mon, 18 Sep 2017 19:16:24 +0200 |
parents | 8fe35754a39d |
children | d2559e2729e4 |
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#![allow(dead_code)] //! A collection of fundamental and/or simple types used by other modules use std::error::Error; use std::fmt::{self, Display, Formatter}; use std::io; use std::result; #[derive(Debug, PartialOrd, PartialEq)] pub enum ValueType { TypeDeletion = 0, TypeValue = 1, } /// Represents a sequence number of a single entry. pub type SequenceNumber = u64; pub const MAX_SEQUENCE_NUMBER: SequenceNumber = (1 << 56) - 1; #[derive(Clone, Debug)] #[allow(dead_code)] pub enum Status { OK, NotFound(String), Corruption(String), NotSupported(String), InvalidArgument(String), PermissionDenied(String), IOError(String), Unknown(String), } impl Display for Status { fn fmt(&self, fmt: &mut Formatter) -> result::Result<(), fmt::Error> { fmt.write_str(self.description()) } } impl Error for Status { fn description(&self) -> &str { match *self { Status::OK => "ok", Status::NotFound(ref s) => s, Status::Corruption(ref s) => s, Status::NotSupported(ref s) => s, Status::InvalidArgument(ref s) => s, Status::PermissionDenied(ref s) => s, Status::IOError(ref s) => s, Status::Unknown(ref s) => s, } } } /// LevelDB's result type pub type Result<T> = result::Result<T, Status>; pub fn from_io_result<T>(e: io::Result<T>) -> Result<T> { match e { Ok(r) => result::Result::Ok(r), Err(e) => { let err = e.description().to_string(); let r = match e.kind() { io::ErrorKind::NotFound => Err(Status::NotFound(err)), io::ErrorKind::InvalidData => Err(Status::Corruption(err)), io::ErrorKind::InvalidInput => Err(Status::InvalidArgument(err)), io::ErrorKind::PermissionDenied => Err(Status::PermissionDenied(err)), _ => Err(Status::IOError(err)), }; r } } }