1 files changed, 66 insertions, 0 deletions
diff --git a/mullvad-relay-selector/src/error.rs b/mullvad-relay-selector/src/error.rs
new file mode 100644
index 0000000000..f988be1b89
--- /dev/null
+++ b/mullvad-relay-selector/src/error.rs
@@ -0,0 +1,66 @@
+//! Definition of relay selector errors
+#![allow(dead_code)]
+
+use mullvad_types::{relay_constraints::MissingCustomBridgeSettings, relay_list::Relay};
+
+use crate::{detailer, WireguardConfig};
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Failed to open relay cache file")]
+    OpenRelayCache(#[source] std::io::Error),
+
+    #[error("Failed to write relay cache file to disk")]
+    WriteRelayCache(#[source] std::io::Error),
+
+    #[error("No relays matching current constraints")]
+    NoRelay,
+
+    #[error("No bridges matching current constraints")]
+    NoBridge,
+
+    #[error("No obfuscators matching current constraints")]
+    NoObfuscator,
+
+    #[error("No endpoint could be constructed due to {} for relay {:?}", .internal, .relay)]
+    NoEndpoint {
+        internal: detailer::Error,
+        relay: EndpointErrorDetails,
+    },
+
+    #[error("Failure in serialization of the relay list")]
+    Serialize(#[from] serde_json::Error),
+
+    #[error("Invalid bridge settings")]
+    InvalidBridgeSettings(#[from] MissingCustomBridgeSettings),
+}
+
+/// Special type which only shows up in [`Error`]. This error variant signals that no valid
+/// endpoint could be constructed from the selected relay.
+#[derive(Debug)]
+pub enum EndpointErrorDetails {
+    /// No valid Wireguard endpoint could be constructed from this [`WireguardConfig`].
+    ///
+    /// # Note
+    /// The inner value is boxed to not bloat the size of [`Error`] due to the size of [`WireguardConfig`].
+    Wireguard(Box<WireguardConfig>),
+    /// No valid OpenVPN endpoint could be constructed from this [`Relay`]
+    ///
+    /// # Note
+    /// The inner value is boxed to not bloat the size of [`Error`] due to the size of [`Relay`].
+    OpenVpn(Box<Relay>),
+}
+
+impl EndpointErrorDetails {
+    /// Helper function for constructing an [`Error::NoEndpoint`] from `relay`.
+    /// Takes care of boxing the [`WireguardConfig`] for you!
+    pub(crate) fn from_wireguard(relay: WireguardConfig) -> Self {
+        EndpointErrorDetails::Wireguard(Box::new(relay))
+    }
+
+    /// Helper function for constructing an [`Error::NoEndpoint`] from `relay`.
+    /// Takes care of boxing the [`Relay`] for you!
+    pub(crate) fn from_openvpn(relay: Relay) -> Self {
+        EndpointErrorDetails::OpenVpn(Box::new(relay))
+    }
+}