util: add helper sum type for unix and tcp socket addresses

this patch introduces a new sum type that can represent either a
tcp socket address or a unix domain socket path.

src/util/lib.rs

@@ -14,6 +14,7 @@ pub mod forwarded_headers;
 pub mod metrics;
 pub mod migrate;
 pub mod persister;
+pub mod socket_address;
 pub mod time;
 pub mod tranquilizer;
 pub mod version;

src/util/socket_address.rs

@@ -0,0 +1,44 @@
+use std::fmt::{Debug, Display, Formatter};
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use std::str::FromStr;
+
+use serde::de::Error;
+use serde::{Deserialize, Deserializer};
+
+#[derive(Debug, Clone)]
+pub enum UnixOrTCPSocketAddress {
+	TCPSocket(SocketAddr),
+	UnixSocket(PathBuf),
+}
+
+impl Display for UnixOrTCPSocketAddress {
+	fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result {
+		match self {
+			UnixOrTCPSocketAddress::TCPSocket(address) => write!(formatter, "http://{}", address),
+			UnixOrTCPSocketAddress::UnixSocket(path) => {
+				write!(formatter, "http+unix://{}", path.to_string_lossy())
+			}
+		}
+	}
+}
+
+impl<'de> Deserialize<'de> for UnixOrTCPSocketAddress {
+	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+	where
+		D: Deserializer<'de>,
+	{
+		let string = String::deserialize(deserializer)?;
+		let string = string.as_str();
+
+		if string.starts_with("/") {
+			Ok(UnixOrTCPSocketAddress::UnixSocket(
+				PathBuf::from_str(string).map_err(Error::custom)?,
+			))
+		} else {
+			Ok(UnixOrTCPSocketAddress::TCPSocket(
+				SocketAddr::from_str(string).map_err(Error::custom)?,
+			))
+		}
+	}
+}