1 files changed, 89 insertions, 0 deletions
diff --git a/toolkit/components/kvstore/src/error.rs b/toolkit/components/kvstore/src/error.rs
new file mode 100644
index 0000000000..82ed2ce0d8
--- /dev/null
+++ b/toolkit/components/kvstore/src/error.rs
@@ -0,0 +1,89 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use nserror::{
+    nsresult, NS_ERROR_FAILURE, NS_ERROR_NOT_IMPLEMENTED, NS_ERROR_NO_INTERFACE,
+    NS_ERROR_NULL_POINTER, NS_ERROR_UNEXPECTED,
+};
+use nsstring::nsCString;
+use rkv::{MigrateError, StoreError};
+use std::{io::Error as IoError, str::Utf8Error, string::FromUtf16Error, sync::PoisonError};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum KeyValueError {
+    #[error("error converting string: {0:?}")]
+    ConvertBytes(#[from] Utf8Error),
+
+    #[error("error converting string: {0:?}")]
+    ConvertString(#[from] FromUtf16Error),
+
+    #[error("I/O error: {0:?}")]
+    IoError(#[from] IoError),
+
+    #[error("migrate error: {0:?}")]
+    MigrateError(#[from] MigrateError),
+
+    #[error("no interface '{0}'")]
+    NoInterface(&'static str),
+
+    // NB: We can avoid storing the nsCString error description
+    // once nsresult is a real type with a Display implementation
+    // per https://bugzilla.mozilla.org/show_bug.cgi?id=1513350.
+    #[error("error result {0}")]
+    Nsresult(nsCString, nsresult),
+
+    #[error("arg is null")]
+    NullPointer,
+
+    #[error("poison error getting read/write lock")]
+    PoisonError,
+
+    #[error("error reading key/value pair")]
+    Read,
+
+    #[error("store error: {0:?}")]
+    StoreError(#[from] StoreError),
+
+    #[error("unsupported owned value type")]
+    UnsupportedOwned,
+
+    #[error("unexpected value")]
+    UnexpectedValue,
+
+    #[error("unsupported variant type: {0}")]
+    UnsupportedVariant(u16),
+}
+
+impl From<nsresult> for KeyValueError {
+    fn from(result: nsresult) -> KeyValueError {
+        KeyValueError::Nsresult(result.error_name(), result)
+    }
+}
+
+impl From<KeyValueError> for nsresult {
+    fn from(err: KeyValueError) -> nsresult {
+        match err {
+            KeyValueError::ConvertBytes(_) => NS_ERROR_FAILURE,
+            KeyValueError::ConvertString(_) => NS_ERROR_FAILURE,
+            KeyValueError::IoError(_) => NS_ERROR_FAILURE,
+            KeyValueError::NoInterface(_) => NS_ERROR_NO_INTERFACE,
+            KeyValueError::Nsresult(_, result) => result,
+            KeyValueError::NullPointer => NS_ERROR_NULL_POINTER,
+            KeyValueError::PoisonError => NS_ERROR_UNEXPECTED,
+            KeyValueError::Read => NS_ERROR_FAILURE,
+            KeyValueError::StoreError(_) => NS_ERROR_FAILURE,
+            KeyValueError::MigrateError(_) => NS_ERROR_FAILURE,
+            KeyValueError::UnsupportedOwned => NS_ERROR_NOT_IMPLEMENTED,
+            KeyValueError::UnexpectedValue => NS_ERROR_UNEXPECTED,
+            KeyValueError::UnsupportedVariant(_) => NS_ERROR_NOT_IMPLEMENTED,
+        }
+    }
+}
+
+impl<T> From<PoisonError<T>> for KeyValueError {
+    fn from(_err: PoisonError<T>) -> KeyValueError {
+        KeyValueError::PoisonError
+    }
+}