Fix error when connecting to other relays

Basically it was because if some field from a `Filter` is not
being used, it should not be serialized and sent to the relay.

Before it was being sent as null, therefore for some fields like
`ids` that would expect an array, it would incur on an error.

TODO.md

@@ -49,6 +49,8 @@ It is working. The problem was with sending the message as BINARY to the client.
 - [x] [CLIENT] Should save its own filters in order to request data from different relays.
 - [x] [CLIENT] Must validate signature.
 - [ ] [CLIENT] Disconnect from relay.
+- [ ] [CLIENT] Add reply/comment function.
+- [ ] [CLIENT] Add retweet function.
 - [ ] [CLIENT/RELAY] Finish the implementation of all the required NIPs (just `NIP01`)
 - [-] [CLIENT] ~~Should have a way of handling duplicated events, since a client can be connected to multiple relays~~ To be used when calling from a frontend or whatnot.
 

client/src/main.rs

@@ -11,17 +11,19 @@ async fn main() {
   let mut client = client::Client::new();
   client.connect().await;
   client.get_notifications().await;
-  // client.follow_author(String::from("82341f882b6eabcd2ba7f1ef90aad961cf074af15b9ef44a09f9d2a8fbfbe6a2")).await; // jack's pubkey
-  client.follow_myself().await;
+  client.follow_author(String::from("82341f882b6eabcd2ba7f1ef90aad961cf074af15b9ef44a09f9d2a8fbfbe6a2")).await; // jack's pubkey
+  // client.follow_myself().await;
   client
     .name("Nostr Client")
     .about("This is a nostr client")
     .picture("someurl.image.com")
     .send_updated_metadata().await;
   client.add_relay(String::from("wss://relay.damus.io")).await;
-  client.subscribe_to_all_stored_requests().await;
+  // client.add_relay(String::from("wss://nostr.wine")).await;
+  client.add_relay(String::from("wss://pow.nostrati.com")).await;
+  // client.subscribe_to_all_stored_requests().await;
   // client.unsubscribe("d8e67092-c17f-4934-8b7d-6c97cb697cc1").await;
-  // client.publish_text_note("hello, potato".to_string()).await;
+  // client.publish_text_note("TESTING!!!".to_string()).await;
 
   let ctrl_c = async {
     tokio::signal::ctrl_c().await.unwrap();

nostr-sdk/src/filter.rs

@@ -23,15 +23,21 @@ use crate::event::{id::EventId, kind::EventKind, PubKey, Timestamp};
 ///
 #[derive(Debug, Serialize, Deserialize, Default, Clone, PartialEq, Eq)]
 pub struct Filter {
+  #[serde(skip_serializing_if="Option::is_none")]
   pub ids: Option<Vec<EventId>>,
+  #[serde(skip_serializing_if="Option::is_none")]
   pub authors: Option<Vec<PubKey>>,
+  #[serde(skip_serializing_if="Option::is_none")]
   pub kinds: Option<Vec<EventKind>>,
-  #[serde(alias = "#e", rename(serialize = "#e"))]
+  #[serde(alias = "#e", rename(serialize = "#e"), skip_serializing_if="Option::is_none")]
   pub e: Option<Vec<String>>,
-  #[serde(alias = "#p", rename(serialize = "#p"))]
+  #[serde(alias = "#p", rename(serialize = "#p"), skip_serializing_if="Option::is_none")]
   pub p: Option<Vec<String>>,
+  #[serde(skip_serializing_if="Option::is_none")]
   pub since: Option<Timestamp>,
+  #[serde(skip_serializing_if="Option::is_none")]
   pub until: Option<Timestamp>,
+  #[serde(skip_serializing_if="Option::is_none")]
   pub limit: Option<Timestamp>,
 }