1 files changed, 61 insertions, 0 deletions
diff --git a/remote/error.rs b/remote/error.rs
new file mode 100644
index 0000000000..7f88735059
--- /dev/null
+++ b/remote/error.rs
@@ -0,0 +1,61 @@
+// 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 std::num;
+
+use http;
+use nserror::{
+    nsresult, NS_ERROR_ILLEGAL_VALUE, NS_ERROR_INVALID_ARG, NS_ERROR_LAUNCHED_CHILD_PROCESS,
+    NS_ERROR_NOT_AVAILABLE,
+};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum RemoteAgentError {
+    #[error("expected address syntax [<host>]:<port>: {0}")]
+    AddressSpec(#[from] http::uri::InvalidUri),
+
+    #[error("may only be instantiated in parent process")]
+    ChildProcess,
+
+    #[error("invalid port: {0}")]
+    InvalidPort(#[from] num::ParseIntError),
+
+    #[error("listener restricted to loopback devices")]
+    LoopbackRestricted,
+
+    #[error("missing port number")]
+    MissingPort,
+
+    #[error("unavailable")]
+    Unavailable,
+
+    #[error("error result {0}")]
+    XpCom(#[source] nsresult),
+}
+
+impl From<RemoteAgentError> for nsresult {
+    fn from(err: RemoteAgentError) -> nsresult {
+        use RemoteAgentError::*;
+        match err {
+            AddressSpec(_) | InvalidPort(_) => NS_ERROR_INVALID_ARG,
+            ChildProcess => NS_ERROR_LAUNCHED_CHILD_PROCESS,
+            LoopbackRestricted => NS_ERROR_ILLEGAL_VALUE,
+            MissingPort => NS_ERROR_INVALID_ARG,
+            Unavailable => NS_ERROR_NOT_AVAILABLE,
+            XpCom(result) => result,
+        }
+    }
+}
+
+impl From<nsresult> for RemoteAgentError {
+    fn from(result: nsresult) -> Self {
+        use RemoteAgentError::*;
+        match result {
+            NS_ERROR_NOT_AVAILABLE => Unavailable,
+            NS_ERROR_LAUNCHED_CHILD_PROCESS => ChildProcess,
+            x => RemoteAgentError::XpCom(x),
+        }
+    }
+}