add relay builder

crates/ptth_relay/src/config.rs

@@ -88,6 +88,7 @@ pub mod file {
 
 /// Config fields as they are used at runtime
 
+#[derive (Default)]
 pub struct Config {
 	pub iso: file::Isomorphic,
 	

crates/ptth_relay/src/relay_state.rs

@@ -184,4 +184,41 @@ impl Relay {
 		.map (|(k, _)| (*k).clone ())
 		.collect ()
 	}
+	
+	pub fn build () -> Builder {
+		Builder::default ()
+	}
+}
+
+#[derive (Default)]
+pub struct Builder {
+	config: Config,
+}
+
+impl Builder {
+	pub fn build (self) -> Result <Relay, RelayError> {
+		Relay::try_from (self.config)
+	}
+	
+	pub fn enable_scraper_api (&mut self, b: bool) -> &mut Self {
+		self.config.iso.enable_scraper_api = b;
+		self
+	}
+	
+	pub fn port (&mut self, port: u16) -> &mut Self {
+		self.config.port = Some (port);
+		self
+	}
+	
+	pub fn scraper_key (&mut self, key: crate::key_validity::ScraperKey <crate::key_validity::Valid30Days>) 
+	-> &mut Self 
+	{
+		self.config.scraper_keys.insert (key.hash.encode_base64 (), key);
+		self
+	}
+	
+	pub fn server (&mut self, server: crate::config::file::Server) -> &mut Self {
+		self.config.servers.insert (server.name.clone (), server);
+		self
+	}
 }