Allow the use of custom context

The main goal of events/reports is to update a context object, which
will be used in filters to generate a response. It is now possible to
use any object implementing both Clone and Default as a context object.
It is also possible to define no context at all.

opensmtpd/Cargo.toml

@@ -20,5 +20,9 @@ opensmtpd_derive = { path = "../opensmtpd-derive", version="0.1" }
 name = "dummy"
 path = "examples/dummy.rs"
 
+[[example]]
+name = "counter"
+path = "examples/session_event_counter.rs"
+
 [dev-dependencies]
 env_logger = "0.6"

opensmtpd/examples/dummy.rs

@@ -1,14 +1,14 @@
 use env_logger::{Builder, Env};
 use log::{debug, info};
-use opensmtpd::{event, handlers, Entry, NoContext, SmtpIn};
+use opensmtpd::{event, handlers, Entry, SmtpIn};
 
 #[event(Any)]
-fn on_event(_context: &mut NoContext, entry: &Entry) {
+fn on_event(entry: &Entry) {
     debug!("Event received: {:?}", entry);
 }
 
 #[event(LinkConnect)]
-fn on_connect(_context: &mut NoContext, entry: &Entry) {
+fn on_connect(entry: &Entry) {
     info!("New client on session {:x}.", entry.session_id);
 }
 

opensmtpd/examples/session_event_counter.rs

@@ -0,0 +1,19 @@
+use env_logger::{Builder, Env};
+use log::info;
+use opensmtpd::{event, handlers, Entry, SmtpIn};
+
+#[derive(Clone, Default)]
+struct MyContext {
+    nb: usize,
+}
+
+#[event(Any)]
+fn on_event(ctx: &mut MyContext, entry: &Entry) {
+    ctx.nb += 1;
+    info!("Event received: {}, {}", entry.session_id, ctx.nb);
+}
+
+fn main() {
+    Builder::from_env(Env::default().default_filter_or("debug")).init();
+    SmtpIn::new().event_handlers(handlers!(on_event)).run();
+}

opensmtpd/src/event_handlers.rs

@@ -65,11 +65,7 @@ mod test {
 
     #[test]
     fn test_eventhandler_build_noctx() {
-        // TODO: Remove the ::<NoContext>
-        EventHandler::new(
-            "Any",
-            Callback::NoCtx::<NoContext>(|_entry: &Entry| {}),
-        );
+        EventHandler::new("Any", Callback::NoCtx::<NoContext>(|_entry: &Entry| {}));
     }
 
     #[test]

opensmtpd/src/lib.rs

@@ -79,16 +79,14 @@ impl<T: Clone + Default + 'static> SmtpIn<T> {
         let mut evts = Vec::new();
         for eh in self.event_handlers.iter() {
             match eh.event {
-                MatchEvent::Evt(ref v) => {
-                    for e in v.iter() {
-                        evts.push(e);
-                    }
+                MatchEvent::Evt(ref v) => for e in v.iter() {
+                    evts.push(e);
                 },
                 MatchEvent::All => {
                     println!("register|report|smtp-in|*");
                     evts.clear();
-                    break ;
-                },
+                    break;
+                }
             }
         }
         evts.dedup();