From c738d59a98e2e5c91cc9ac15f131eae55bb3a717 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 8 Aug 2021 20:51:56 +0100
Subject: [PATCH] server: MetadataFieldIterator::need

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/multipart.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/multipart.rs b/src/multipart.rs
index 4ebff64..5099f05 100644
--- a/src/multipart.rs
+++ b/src/multipart.rs
@@ -87,6 +87,14 @@ impl<'b> MetadataFieldIterator<'b> {
     iter: memchr::Memchr::new(b'\n', buf),
   } }
 
+  #[throws(AE)]
+  pub fn need<T>(&mut self) -> T
+  where T: FromStr,
+        T::Err: std::error::Error + Sync + Send + 'static,
+  {
+    self.parse()?.ok_or_else(|| anyhow!("missing"))?
+  }
+
   #[throws(AE)]
   pub fn parse<T>(&mut self) -> Option<T>
   where T: FromStr,
-- 
2.30.2