1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/rust/relevancy/src/error.rs b/third_party/rust/relevancy/src/error.rs
new file mode 100644
index 0000000000..93ca7aabaa
--- /dev/null
+++ b/third_party/rust/relevancy/src/error.rs
@@ -0,0 +1,44 @@
+/* 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 error_support::{ErrorHandling, GetErrorHandling};
+
+/// Errors we return via the public interface.
+#[derive(Debug, thiserror::Error)]
+pub enum RelevancyApiError {
+    #[error("Unexpected Error: {reason}")]
+    Unexpected { reason: String },
+}
+
+/// Errors we use internally
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Error opening database: {0}")]
+    OpenDatabase(#[from] sql_support::open_database::Error),
+
+    #[error("Sql error: {0}")]
+    SqlError(#[from] rusqlite::Error),
+
+    #[error("Error fetching interest data")]
+    FetchInterestDataError,
+}
+
+/// Result enum for the public API
+pub type ApiResult<T> = std::result::Result<T, RelevancyApiError>;
+
+/// Result enum for internal functions
+pub type Result<T> = std::result::Result<T, Error>;
+
+// Define how our internal errors are handled and converted to external errors
+// See `support/error/README.md` for how this works, especially the warning about PII.
+impl GetErrorHandling for Error {
+    type ExternalError = RelevancyApiError;
+
+    fn get_error_handling(&self) -> ErrorHandling<Self::ExternalError> {
+        ErrorHandling::convert(RelevancyApiError::Unexpected {
+            reason: self.to_string(),
+        })
+    }
+}