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use faiss_sys::*;
use std::error::Error as StdError;
use std::ffi::CStr;
use std::fmt;
use std::os::raw::c_int;
pub type Result<T> = ::std::result::Result<T, Error>;
#[derive(Debug, Clone, PartialEq)]
pub enum Error {
Native(NativeError),
BadCast,
IndexDescription,
BadFilePath,
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.write_str(self.description())
}
}
impl StdError for Error {
fn description(&self) -> &str {
match *self {
Error::Native(ref e) => &e.msg,
Error::BadCast => "Invalid index type cast",
Error::IndexDescription => "Invalid index description",
Error::BadFilePath => "Invalid file path",
}
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct NativeError {
code: c_int,
msg: String,
}
impl NativeError {
pub fn code(&self) -> c_int {
self.code
}
pub fn msg(&self) -> &str {
&self.msg
}
}
impl NativeError {
pub fn from_last_error(code: c_int) -> Self {
unsafe {
let e: *const _ = faiss_get_last_error();
assert!(!e.is_null());
let cstr = CStr::from_ptr(e);
let msg: String = cstr.to_string_lossy().into_owned();
NativeError { code, msg }
}
}
}
impl fmt::Display for NativeError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.write_str(&self.msg)
}
}
impl StdError for NativeError {
fn description(&self) -> &str {
&self.msg
}
}
impl From<NativeError> for Error {
fn from(e: NativeError) -> Self {
Error::Native(e)
}
}