Merge a few relay fixes from ken

Pick a few fixes from #380

Link: #380

Ken Sedgwick (5):
      build: Cargo.lock updates to mitigate num_enum_derive problem
      add .rustfmt.toml to specify edition
      Fix parsing of subscription id for RelayMessage::Event
      Skip adding relays that are already in the pool
      canonicalize relay urls to avoid false duplicates

.rustfmt.toml

@@ -0,0 +1 @@
+edition = "2021"

enostr/Cargo.toml

@@ -15,3 +15,4 @@ nostrdb = { git = "https://github.com/damus-io/nostrdb-rs", rev = "9bbafd8a2e904
 hex = "0.4.3"
 tracing = "0.1.40"
 env_logger = "0.11.1"
+url = "2.5.2"

enostr/src/relay/message.rs

@@ -90,7 +90,17 @@ impl<'a> RelayMessage<'a> {
         // Event
         // Relay response format: ["EVENT", <subscription id>, <event JSON>]
         if &msg[0..=7] == "[\"EVENT\"" {
-            return Ok(Self::event(msg, "fixme"));
+            let mut start = 9;
+            while let Some(&b' ') = msg.as_bytes().get(start) {
+                start += 1; // Move past optional spaces
+            }
+            if let Some(comma_index) = msg[start..].find(',') {
+                let subid_end = start + comma_index;
+                let subid = &msg[start..subid_end].trim().trim_matches('"');
+                return Ok(Self::event(msg, subid));
+            } else {
+                return Ok(Self::event(msg, "fixme"));
+            }
         }
 
         // EOSE (NIP-15)

enostr/src/relay/pool.rs

@@ -4,6 +4,8 @@ use nostrdb::Filter;
 
 use std::time::{Duration, Instant};
 
+use url::Url;
+
 #[cfg(not(target_arch = "wasm32"))]
 use ewebsock::{WsEvent, WsMessage};
 
@@ -152,6 +154,11 @@ impl RelayPool {
         url: String,
         wakeup: impl Fn() + Send + Sync + Clone + 'static,
     ) -> Result<()> {
+        let url = Self::canonicalize_url(url);
+        // Check if the URL already exists in the pool.
+        if self.has(&url) {
+            return Ok(());
+        }
         let relay = Relay::new(url, wakeup)?;
         let pool_relay = PoolRelay::new(relay);
 
@@ -160,6 +167,14 @@ impl RelayPool {
         Ok(())
     }
 
+    // standardize the format (ie, trailing slashes)
+    fn canonicalize_url(url: String) -> String {
+        match Url::parse(&url) {
+            Ok(parsed_url) => parsed_url.to_string(),
+            Err(_) => url, // If parsing fails, return the original URL.
+        }
+    }
+
     /// Attempts to receive a pool event from a list of relays. The
     /// function searches each relay in the list in order, attempting to
     /// receive a message from each. If a message is received, return it.