feat(ext/fetch): Parse vsock proxy from env var

Author: lrowe

ext/fetch/proxy.rs

@@ -214,6 +214,14 @@ impl Target {
         path: decoded.into(),
       });
     }
+    // vsock:<cid>:<port> is valid RFC3986 but not as an http::Uri
+    #[cfg(any(target_os = "linux", target_os = "macos"))]
+    if let Some(cid_port) = val.strip_prefix("vsock:") {
+      let (left, right) = cid_port.split_once(":")?;
+      let cid = left.parse::<u32>().ok()?;
+      let port = right.parse::<u32>().ok()?;
+      return Some(Target::Vsock { cid, port });
+    }
 
     let uri = val.parse::<Uri>().ok()?;
 
@@ -920,6 +928,16 @@ fn test_proxy_parse_from_env() {
     }
     _ => panic!("bad target"),
   }
+
+  // vsock
+  #[cfg(any(target_os = "linux", target_os = "macos"))]
+  match parse("vsock:1234:5678") {
+    Target::Vsock { cid, port } => {
+      assert_eq!(cid, 1234);
+      assert_eq!(port, 5678);
+    }
+    _ => panic!("bad target"),
+  }
 }
 
 #[test]