Replace str_split_once to lower actix-tls msrv to 1.50.0 and bump actix-net to 1.50.0 (#434)

Author: david-mcgillicuddy-moixa

actix-tls/CHANGES.md

@@ -1,7 +1,7 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
-
+- Remove use of `str::split_once` to lower MSRV of `actix-tls` to a de-facto 1.50.0 from 1.52.0
 
 ## 3.0.0 - 2021-12-26
 * No significant changes since `3.0.0-rc.2`.

actix-tls/src/connect/host.rs

@@ -27,25 +27,25 @@ pub trait Host: Unpin + 'static {
 
 impl Host for String {
     fn hostname(&self) -> &str {
-        self.split_once(':')
+        str_split_once(self, ':')
             .map(|(hostname, _)| hostname)
             .unwrap_or(self)
     }
 
     fn port(&self) -> Option<u16> {
-        self.split_once(':').and_then(|(_, port)| port.parse().ok())
+        str_split_once(self, ':').and_then(|(_, port)| port.parse().ok())
     }
 }
 
 impl Host for &'static str {
     fn hostname(&self) -> &str {
-        self.split_once(':')
+        str_split_once(self, ':')
             .map(|(hostname, _)| hostname)
             .unwrap_or(self)
     }
 
     fn port(&self) -> Option<u16> {
-        self.split_once(':').and_then(|(_, port)| port.parse().ok())
+        str_split_once(self, ':').and_then(|(_, port)| port.parse().ok())
     }
 }
 
@@ -69,3 +69,11 @@ mod tests {
         assert_connection_info_eq!("example.com:false:false", "example.com", None);
     }
 }
+
+// `str::split_once` is stabilized in 1.52.0
+fn str_split_once(str: &str, delimiter: char) -> Option<(&str, &str)> {
+    let mut splitn = str.splitn(2, delimiter);
+    let prefix = splitn.next()?;
+    let suffix = splitn.next()?;
+    Some((prefix, suffix))
+}