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use std::io; use std::fmt; use std::error; #[derive(Debug)] pub enum MemcacheError { Io(io::Error), Error, ClientError(String), ServerError(String), } impl fmt::Display for MemcacheError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match *self { MemcacheError::Io(ref err) => err.fmt(f), MemcacheError::Error => write!(f, "Error"), MemcacheError::ClientError(ref s) => s.fmt(f), MemcacheError::ServerError(ref s) => s.fmt(f), } } } impl error::Error for MemcacheError { fn description(&self) -> &str { match *self { MemcacheError::Io(ref err) => err.description(), MemcacheError::Error => "Error", MemcacheError::ClientError(ref s) => s.as_str(), MemcacheError::ServerError(ref s) => s.as_str(), } } fn cause(&self) -> Option<&error::Error> { match *self { MemcacheError::Io(ref err) => Some(err), MemcacheError::Error => None, MemcacheError::ClientError(_) => None, MemcacheError::ServerError(_) => None, } } } impl From<io::Error> for MemcacheError { fn from(err: io::Error) -> MemcacheError { MemcacheError::Io(err) } } impl From<String> for MemcacheError { fn from(s: String) -> MemcacheError { if s == "ERROR\r\n" { return MemcacheError::Error; } else if s.starts_with("CLIENT_ERROR") { return MemcacheError::ClientError(s); } else if s.starts_with("SERVER_ERROR") { return MemcacheError::ServerError(s); } else { panic!("{} if not a memcached error!", s); } } } pub fn is_memcache_error(s: &str) -> bool { return s == "ERROR\r\n" || s.starts_with("CIENT_ERROR") || s.starts_with("SERVER_ERROR"); }