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// Copyright 2018-2019 Mozilla
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::{error, fmt, result, str::Utf8Error, string::FromUtf16Error};
use crate::guid::Guid;
use crate::Item;
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug)]
pub struct Error(ErrorKind);
impl Error {
pub fn kind(&self) -> &ErrorKind {
&self.0
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self.kind() {
ErrorKind::MalformedString(err) => Some(err.as_ref()),
_ => None,
}
}
}
impl From<ErrorKind> for Error {
fn from(kind: ErrorKind) -> Error {
Error(kind)
}
}
impl From<FromUtf16Error> for Error {
fn from(error: FromUtf16Error) -> Error {
Error(ErrorKind::MalformedString(error.into()))
}
}
impl From<Utf8Error> for Error {
fn from(error: Utf8Error) -> Error {
Error(ErrorKind::MalformedString(error.into()))
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// We format the guid-specific params with <guid: {}> to make it easier on the
// telemetry side to parse out the user-specific guid and normalize the errors
// to better aggregate the data
match self.kind() {
ErrorKind::MismatchedItemKind(local_item, remote_item) => write!(
f,
"Can't merge local {} <guid: {}> and remote {} <guid: {}>",
local_item.kind, local_item.guid, remote_item.kind, remote_item.guid,
),
ErrorKind::DuplicateItem(guid) => {
write!(f, "Item <guid: {}> already exists in tree", guid)
}
ErrorKind::MissingItem(guid) => {
write!(f, "Item <guid: {}> doesn't exist in tree", guid)
}
ErrorKind::InvalidParent(child, parent) => write!(
f,
"Can't insert {} <guid: {}> into {} <guid: {}>",
child.kind, child.guid, parent.kind, parent.guid,
),
ErrorKind::InvalidParentForUnknownChild(child_guid, parent) => write!(
f,
"Can't insert unknown child <guid: {}> into {} <guid: {}>",
child_guid, parent.kind, parent.guid,
),
ErrorKind::MissingParent(child, parent_guid) => write!(
f,
"Can't insert {} <guid: {}> into nonexistent parent <guid: {}>",
child.kind, child.guid, parent_guid,
),
ErrorKind::MissingParentForUnknownChild(child_guid, parent_guid) => write!(
f,
"Can't insert unknown child <guid: {}> into nonexistent parent <guid: {}>",
child_guid, parent_guid,
),
ErrorKind::Cycle(guid) => write!(f, "Item <guid: {}> can't contain itself", guid),
ErrorKind::MergeConflict => write!(f, "Local tree changed during merge"),
ErrorKind::UnmergedLocalItems => {
write!(f, "Merged tree doesn't mention all items from local tree")
}
ErrorKind::UnmergedRemoteItems => {
write!(f, "Merged tree doesn't mention all items from remote tree")
}
ErrorKind::InvalidGuid(invalid_guid) => {
write!(
f,
"Merged tree contains invalid GUID <guid: {}>",
invalid_guid
)
}
ErrorKind::InvalidByte(b) => write!(f, "Invalid byte <byte: {}> in UTF-16 encoding", b),
ErrorKind::MalformedString(err) => err.fmt(f),
ErrorKind::Abort => write!(f, "Operation aborted"),
}
}
}
#[derive(Debug)]
pub enum ErrorKind {
MismatchedItemKind(Item, Item),
DuplicateItem(Guid),
InvalidParent(Item, Item),
InvalidParentForUnknownChild(Guid, Item),
MissingParent(Item, Guid),
MissingParentForUnknownChild(Guid, Guid),
MissingItem(Guid),
Cycle(Guid),
MergeConflict,
UnmergedLocalItems,
UnmergedRemoteItems,
InvalidGuid(Guid),
InvalidByte(u16),
MalformedString(Box<dyn error::Error + Send + Sync + 'static>),
Abort,
}
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