build: bump version to 0.7.2

Updating crates.io index
Updating cc v1.0.74 -> v1.0.76
Updating chrono v0.4.22 -> v0.4.23
Updating cxx v1.0.80 -> v1.0.82
Updating cxx-build v1.0.80 -> v1.0.82
Updating cxxbridge-flags v1.0.80 -> v1.0.82
Updating cxxbridge-macro v1.0.80 -> v1.0.82
Updating digest v0.10.5 -> v0.10.6
Updating hyper v0.14.22 -> v0.14.23
Updating indexmap v1.9.1 -> v1.9.2
Updating regex v1.6.0 -> v1.7.0
Updating regex-syntax v0.6.27 -> v0.6.28
Updating serde_json v1.0.87 -> v1.0.88
Updating tokio v1.21.2 -> v1.22.0
Updating uuid v1.2.1 -> v1.2.2

Cargo.lock

@@ -200,9 +200,9 @@ checksum = "ec8a7b6a70fde80372154c65702f00a0f56f3e1c36abbc6c440484be248856db"
 
 [[package]]
 name = "cc"
-version = "1.0.74"
+version = "1.0.76"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "581f5dba903aac52ea3feb5ec4810848460ee833876f1f9b0fdeab1f19091574"
+checksum = "76a284da2e6fe2092f2353e51713435363112dfd60030e22add80be333fb928f"
 
 [[package]]
 name = "cfg-if"
@@ -212,9 +212,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.22"
+version = "0.4.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfd4d1b31faaa3a89d7934dbded3111da0d2ef28e3ebccdb4f0179f5929d1ef1"
+checksum = "16b0a3d9ed01224b22057780a37bb8c5dbfe1be8ba48678e7bf57ec4b385411f"
 dependencies = [
  "iana-time-zone",
  "num-integer",
@@ -381,9 +381,9 @@ dependencies = [
 
 [[package]]
 name = "cxx"
-version = "1.0.80"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b7d4e43b25d3c994662706a1d4fcfc32aaa6afd287502c111b237093bb23f3a"
+checksum = "d4a41a86530d0fe7f5d9ea779916b7cadd2d4f9add748b99c2c029cbbdfaf453"
 dependencies = [
  "cc",
  "cxxbridge-flags",
@@ -393,9 +393,9 @@ dependencies = [
 
 [[package]]
 name = "cxx-build"
-version = "1.0.80"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84f8829ddc213e2c1368e51a2564c552b65a8cb6a28f31e576270ac81d5e5827"
+checksum = "06416d667ff3e3ad2df1cd8cd8afae5da26cf9cec4d0825040f88b5ca659a2f0"
 dependencies = [
  "cc",
  "codespan-reporting",
@@ -408,15 +408,15 @@ dependencies = [
 
 [[package]]
 name = "cxxbridge-flags"
-version = "1.0.80"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e72537424b474af1460806647c41d4b6d35d09ef7fe031c5c2fa5766047cc56a"
+checksum = "820a9a2af1669deeef27cb271f476ffd196a2c4b6731336011e0ba63e2c7cf71"
 
 [[package]]
 name = "cxxbridge-macro"
-version = "1.0.80"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "309e4fb93eed90e1e14bea0da16b209f81813ba9fc7830c20ed151dd7bc0a4d7"
+checksum = "a08a6e2fcc370a089ad3b4aaf54db3b1b4cee38ddabce5896b33eb693275f470"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -438,9 +438,9 @@ dependencies = [
 
 [[package]]
 name = "digest"
-version = "0.10.5"
+version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfbc57365a37acbd2ebf2b64d7e69bb766e2fea813521ed536f5d0520dcf86c"
+checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -789,9 +789,9 @@ checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
 [[package]]
 name = "hyper"
-version = "0.14.22"
+version = "0.14.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abfba89e19b959ca163c7752ba59d737c1ceea53a5d31a149c805446fc958064"
+checksum = "034711faac9d2166cb1baf1a2fb0b60b1f277f8492fd72176c17f3515e1abd3c"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -872,9 +872,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.9.1"
+version = "1.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
+checksum = "1885e79c1fc4b10f0e172c475f458b7f7b93061064d98c3293e98c5ba0c8b399"
 dependencies = [
  "autocfg 1.1.0",
  "hashbrown 0.12.3",
@@ -1095,7 +1095,7 @@ checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
 
 [[package]]
 name = "nostr-rs-relay"
-version = "0.7.1"
+version = "0.7.2"
 dependencies = [
  "anyhow",
  "bitcoin_hashes",
@@ -1664,9 +1664,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c4eb3267174b8c6c2f654116623910a0fef09c4753f8dd83db29c48a0df988b"
+checksum = "e076559ef8e241f2ae3479e36f97bd5741c0330689e217ad51ce2c76808b868a"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1684,9 +1684,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.27"
+version = "0.6.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3f87b73ce11b1619a3c6332f45341e0047173771e8b8b73f87bfeefb7b56244"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
 
 [[package]]
 name = "remove_dir_all"
@@ -1836,9 +1836,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.87"
+version = "1.0.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce777b7b150d76b9cf60d28b55f5847135a003f7d7350c6be7a773508ce7d45"
+checksum = "8e8b3801309262e8184d9687fb697586833e939767aea0dda89f5a8e650e8bd7"
 dependencies = [
  "indexmap",
  "itoa",
@@ -1997,9 +1997,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.21.2"
+version = "1.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9e03c497dc955702ba729190dc4aac6f2a0ce97f913e5b1b5912fc5039d9099"
+checksum = "d76ce4a75fb488c605c54bf610f221cea8b0dafb53333c1a67e8ee199dcd2ae3"
 dependencies = [
  "autocfg 1.1.0",
  "bytes",
@@ -2367,9 +2367,9 @@ checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
 [[package]]
 name = "uuid"
-version = "1.2.1"
+version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "feb41e78f93363bb2df8b0e86a2ca30eed7806ea16ea0c790d757cf93f79be83"
+checksum = "422ee0de9031b5b948b97a8fc04e3aa35230001a722ddd27943e0be31564ce4c"
 dependencies = [
  "getrandom",
 ]

Cargo.toml

@@ -1,7 +1,15 @@
 [package]
 name = "nostr-rs-relay"
-version = "0.7.1"
+version = "0.7.2"
 edition = "2021"
+authors = ["Greg Heartsfield <scsibug@imap.cc>"]
+description = "A relay implementation for the Nostr protocol"
+readme = "README.md"
+homepage = "https://sr.ht/~gheartsfield/nostr-rs-relay/"
+repository = "https://git.sr.ht/~gheartsfield/nostr-rs-relay"
+license = "MIT"
+keywords = ["nostr", "server"]
+categories = ["network-programming", "web-programming"]
 
 [dependencies]
 tracing = "0.1.36"

Dockerfile

@@ -1,16 +1,21 @@
 FROM docker.io/library/rust:1.65.0@sha256:1bca14676a365d0ed37a1e2a1da86c2bcf883fdf6e6886469434763d94d4afd5 as builder
 
+RUN USER=root cargo install cargo-auditable
 RUN USER=root cargo new --bin nostr-rs-relay
 WORKDIR ./nostr-rs-relay
 COPY ./Cargo.toml ./Cargo.toml
 COPY ./Cargo.lock ./Cargo.lock
-RUN cargo build --release
+# build dependencies only (caching)
+RUN cargo auditable build --release --locked
+# get rid of starter project code
 RUN rm src/*.rs
 
+# copy project source code
 COPY ./src ./src
 
+# build auditable release using locked deps
 RUN rm ./target/release/deps/nostr*relay*
-RUN cargo build --release
+RUN cargo auditable build --release --locked
 
 FROM docker.io/library/debian:bullseye-20221024-slim@sha256:76cdda8fe5eb597ef5e712e4c9a9f5f1fb119e69f353daaa7bd6d0f6e66e541d
 

README.md

@@ -26,6 +26,7 @@ mirrored on [GitHub](https://github.com/scsibug/nostr-rs-relay).
 - [x] NIP-12: [Generic Tag Queries](https://github.com/nostr-protocol/nips/blob/master/12.md)
 - [x] NIP-15: [End of Stored Events Notice](https://github.com/nostr-protocol/nips/blob/master/15.md)
 - [x] NIP-16: [Event Treatment](https://github.com/nostr-protocol/nips/blob/master/16.md)
+- [x] NIP-20: [Command Results](https://github.com/nostr-protocol/nips/blob/master/20.md)
 - [x] NIP-22: [Event `created_at` limits](https://github.com/nostr-protocol/nips/blob/master/22.md) (_future-dated events only_)
 - [x] NIP-26: [Event Delegation](https://github.com/nostr-protocol/nips/blob/master/26.md)
 

src/conn.rs

@@ -2,7 +2,6 @@
 use crate::close::Close;
 use crate::error::Error;
 use crate::error::Result;
-use crate::event::Event;
 
 use crate::subscription::Subscription;
 use std::collections::HashMap;
@@ -43,6 +42,10 @@ impl ClientConn {
         }
     }
 
+    pub fn subscriptions(&self) -> &HashMap<String, Subscription> {
+        &self.subscriptions
+    }
+
     /// Get a short prefix of the client's unique identifier, suitable
     /// for logging.
     #[must_use]
@@ -55,18 +58,6 @@ impl ClientConn {
         &self.client_ip
     }
 
-    /// Find all matching subscriptions.
-    #[must_use]
-    pub fn get_matching_subscriptions(&self, e: &Event) -> Vec<&str> {
-        let mut v: Vec<&str> = vec![];
-        for (id, sub) in &self.subscriptions {
-            if sub.interested_in_event(e) {
-                v.push(id);
-            }
-        }
-        v
-    }
-
     /// Add a new subscription for this connection.
     /// # Errors
     ///
@@ -110,9 +101,9 @@ impl ClientConn {
         // TODO: return notice if subscription did not exist.
         self.subscriptions.remove(&c.id);
         debug!(
-            "removed subscription, currently have {} active subs (cid={:?})",
+            "removed subscription, currently have {} active subs (cid={})",
             self.subscriptions.len(),
-            self.client_id
+            self.get_client_prefix(),
         );
     }
 }

src/db.rs

@@ -6,6 +6,7 @@ use crate::event::{single_char_tagname, Event};
 use crate::hexrange::hex_range;
 use crate::hexrange::HexSearch;
 use crate::nip05;
+use crate::notice::Notice;
 use crate::schema::{upgrade_db, STARTUP_SQL};
 use crate::subscription::ReqFilter;
 use crate::subscription::Subscription;
@@ -32,7 +33,7 @@ pub type PooledConnection = r2d2::PooledConnection<r2d2_sqlite::SqliteConnection
 /// Events submitted from a client, with a return channel for notices
 pub struct SubmittedEvent {
     pub event: Event,
-    pub notice_tx: tokio::sync::mpsc::Sender<String>,
+    pub notice_tx: tokio::sync::mpsc::Sender<Notice>,
 }
 
 /// Database file
@@ -158,7 +159,10 @@ pub async fn db_writer(
                         event.get_event_id_prefix()
                     );
                     notice_tx
-                        .try_send("pubkey is not allowed to publish to this relay".to_owned())
+                        .try_send(Notice::blocked(
+                            event.id,
+                            "pubkey is not allowed to publish to this relay",
+                        ))
                         .ok();
                     continue;
                 }
@@ -189,10 +193,10 @@ pub async fn db_writer(
                                   event.get_author_prefix()
                             );
                             notice_tx
-                                .try_send(
-                                    "NIP-05 verification is no longer valid (expired/wrong domain)"
-                                        .to_owned(),
-                                )
+                                .try_send(Notice::blocked(
+                                    event.id,
+                                    "NIP-05 verification is no longer valid (expired/wrong domain)",
+                                ))
                                 .ok();
                             continue;
                         }
@@ -203,7 +207,10 @@ pub async fn db_writer(
                             event.get_author_prefix()
                         );
                         notice_tx
-                            .try_send("NIP-05 verification needed to publish events".to_owned())
+                            .try_send(Notice::blocked(
+                                event.id,
+                                "NIP-05 verification needed to publish events",
+                            ))
                             .ok();
                         continue;
                     }
@@ -218,7 +225,7 @@ pub async fn db_writer(
             if event.kind >= 20000 && event.kind < 30000 {
                 bcast_tx.send(event.clone()).ok();
                 info!(
-                    "published ephemeral event {:?} from {:?} in {:?}",
+                    "published ephemeral event: {:?} from: {:?} in: {:?}",
                     event.get_event_id_prefix(),
                     event.get_author_prefix(),
                     start.elapsed()
@@ -229,9 +236,10 @@ pub async fn db_writer(
                     Ok(updated) => {
                         if updated == 0 {
                             trace!("ignoring duplicate or deleted event");
+                            notice_tx.try_send(Notice::duplicate(event.id)).ok();
                         } else {
                             info!(
-                                "persisted event {:?} from {:?} in {:?}",
+                                "persisted event: {:?} from: {:?} in: {:?}",
                                 event.get_event_id_prefix(),
                                 event.get_author_prefix(),
                                 start.elapsed()
@@ -239,16 +247,13 @@ pub async fn db_writer(
                             event_write = true;
                             // send this out to all clients
                             bcast_tx.send(event.clone()).ok();
+                            notice_tx.try_send(Notice::saved(event.id)).ok();
                         }
                     }
                     Err(err) => {
                         warn!("event insert failed: {:?}", err);
-                        notice_tx
-                            .try_send(
-                                "relay experienced an error trying to publish the latest event"
-                                    .to_owned(),
-                            )
-                            .ok();
+                        let msg = "relay experienced an error trying to publish the latest event";
+                        notice_tx.try_send(Notice::error(event.id, msg)).ok();
                     }
                 }
             }
@@ -577,7 +582,7 @@ fn query_from_sub(sub: &Subscription) -> (String, Vec<Box<dyn ToSql>>) {
         .map(|s| format!("SELECT content, created_at FROM ({})", s))
         .collect();
     let query: String = subqueries_selects.join(" UNION ");
-    debug!("final query string: {}", query);
+    trace!("final query string: {}", query);
     (query, params)
 }
 
@@ -595,12 +600,12 @@ pub async fn db_query(
     mut abandon_query_rx: tokio::sync::oneshot::Receiver<()>,
 ) {
     task::spawn_blocking(move || {
-        debug!("going to query for: {:?}", sub);
+        trace!("going to query for: {:?}", sub);
         let mut row_count: usize = 0;
         let start = Instant::now();
         // generate SQL query
         let (q, p) = query_from_sub(&sub);
-        debug!("SQL generated in {:?}", start.elapsed());
+        trace!("SQL generated in {:?}", start.elapsed());
         // show pool stats
         debug!("DB pool stats: {:?}", pool.state());
         let start = Instant::now();

src/error.rs

@@ -17,10 +17,16 @@ pub enum Error {
     ConnWriteError,
     #[error("EVENT parse failed")]
     EventParseFailed,
-    #[error("ClOSE message parse failed")]
+    #[error("CLOSE message parse failed")]
     CloseParseFailed,
-    #[error("Event validation failed")]
-    EventInvalid,
+    #[error("Event invalid signature")]
+    EventInvalidSignature,
+    #[error("Event invalid id")]
+    EventInvalidId,
+    #[error("Event malformed pubkey")]
+    EventMalformedPubkey,
+    #[error("Event could not canonicalize")]
+    EventCouldNotCanonicalize,
     #[error("Event too large")]
     EventMaxLengthError(usize),
     #[error("Subscription identifier max length exceeded")]

src/event.rs

@@ -27,6 +27,12 @@ pub struct EventCmd {
     event: Event,
 }
 
+impl EventCmd {
+    pub fn event_id(&self) -> &str {
+        &self.event.id
+    }
+}
+
 /// Parsed nostr event.
 #[derive(Serialize, Deserialize, PartialEq, Eq, Debug, Clone)]
 pub struct Event {
@@ -83,13 +89,13 @@ impl From<EventCmd> for Result<Event> {
         // ensure command is correct
         if ec.cmd != "EVENT" {
             Err(CommandUnknownError)
-        } else if ec.event.is_valid() {
-            let mut e = ec.event;
-            e.build_index();
-            e.update_delegation();
-            Ok(e)
         } else {
-            Err(EventInvalid)
+            ec.event.validate().map(|_| {
+                let mut e = ec.event;
+                e.build_index();
+                e.update_delegation();
+                e
+            })
         }
     }
 }
@@ -220,7 +226,7 @@ impl Event {
     }
 
     /// Check if this event has a valid signature.
-    fn is_valid(&self) -> bool {
+    fn validate(&self) -> Result<()> {
         // TODO: return a Result with a reason for invalid events
         // validation is performed by:
         // * parsing JSON string into event fields
@@ -229,8 +235,8 @@ impl Event {
         // * serialize with no spaces/newlines
         let c_opt = self.to_canonical();
         if c_opt.is_none() {
-            debug!("event could not be canonicalized");
-            return false;
+            debug!("could not canonicalize");
+            return Err(EventCouldNotCanonicalize);
         }
         let c = c_opt.unwrap();
         // * compute the sha256sum.
@@ -239,21 +245,21 @@ impl Event {
         // * ensure the id matches the computed sha256sum.
         if self.id != hex_digest {
             debug!("event id does not match digest");
-            return false;
+            return Err(EventInvalidId);
         }
         // * validate the message digest (sig) using the pubkey & computed sha256 message hash.
         let sig = schnorr::Signature::from_str(&self.sig).unwrap();
         if let Ok(msg) = secp256k1::Message::from_slice(digest.as_ref()) {
             if let Ok(pubkey) = XOnlyPublicKey::from_str(&self.pubkey) {
-                let verify = SECP.verify_schnorr(&sig, &msg, &pubkey);
-                matches!(verify, Ok(()))
+                SECP.verify_schnorr(&sig, &msg, &pubkey)
+                    .map_err(|_| EventInvalidSignature)
             } else {
                 debug!("client sent malformed pubkey");
-                false
+                Err(EventMalformedPubkey)
             }
         } else {
             info!("error converting digest to secp256k1 message");
-            false
+            Err(EventInvalidSignature)
         }
     }
 

src/info.rs

@@ -35,7 +35,7 @@ impl From<config::Info> for RelayInfo {
             description: i.description,
             pubkey: i.pubkey,
             contact: i.contact,
-            supported_nips: Some(vec![1, 2, 9, 11, 12, 15, 16, 22, 26]),
+            supported_nips: Some(vec![1, 2, 9, 11, 12, 15, 16, 20, 22, 26]),
             software: Some("https://git.sr.ht/~gheartsfield/nostr-rs-relay".to_owned()),
             version: CARGO_PKG_VERSION.map(|x| x.to_owned()),
         }

src/lib.rs

@@ -8,6 +8,7 @@ pub mod event;
 pub mod hexrange;
 pub mod info;
 pub mod nip05;
+pub mod notice;
 pub mod schema;
 pub mod subscription;
 pub mod utils;

src/notice.rs

@@ -0,0 +1,86 @@
+pub enum EventResultStatus {
+    Saved,
+    Duplicate,
+    Invalid,
+    Blocked,
+    RateLimited,
+    Error,
+}
+
+pub struct EventResult {
+    pub id: String,
+    pub msg: String,
+    pub status: EventResultStatus,
+}
+
+pub enum Notice {
+    Message(String),
+    EventResult(EventResult),
+}
+
+impl EventResultStatus {
+    pub fn to_bool(&self) -> bool {
+        match self {
+            Self::Saved => true,
+            Self::Duplicate => true,
+            Self::Invalid => false,
+            Self::Blocked => false,
+            Self::RateLimited => false,
+            Self::Error => false,
+        }
+    }
+
+    pub fn prefix(&self) -> &'static str {
+        match self {
+            Self::Saved => "saved",
+            Self::Duplicate => "duplicate",
+            Self::Invalid => "invalid",
+            Self::Blocked => "blocked",
+            Self::RateLimited => "rate-limited",
+            Self::Error => "error",
+        }
+    }
+}
+
+impl Notice {
+    //pub fn err(err: error::Error, id: String) -> Notice {
+    //    Notice::err_msg(format!("{}", err), id)
+    //}
+
+    pub fn message(msg: String) -> Notice {
+        Notice::Message(msg)
+    }
+
+    fn prefixed(id: String, msg: &str, status: EventResultStatus) -> Notice {
+        let msg = format!("{}: {}", status.prefix(), msg);
+        Notice::EventResult(EventResult { id, msg, status })
+    }
+
+    pub fn invalid(id: String, msg: &str) -> Notice {
+        Notice::prefixed(id, msg, EventResultStatus::Invalid)
+    }
+
+    pub fn blocked(id: String, msg: &str) -> Notice {
+        Notice::prefixed(id, msg, EventResultStatus::Blocked)
+    }
+
+    pub fn rate_limited(id: String, msg: &str) -> Notice {
+        Notice::prefixed(id, msg, EventResultStatus::RateLimited)
+    }
+
+    pub fn duplicate(id: String) -> Notice {
+        Notice::prefixed(id, "", EventResultStatus::Duplicate)
+    }
+
+    pub fn error(id: String, msg: &str) -> Notice {
+        Notice::prefixed(id, msg, EventResultStatus::Error)
+    }
+
+    pub fn saved(id: String) -> Notice {
+        Notice::EventResult(EventResult {
+            id,
+            msg: "".into(),
+            status: EventResultStatus::Saved,
+        })
+    }
+}

src/server.rs

@@ -10,6 +10,7 @@ use crate::event::Event;
 use crate::event::EventCmd;
 use crate::info::RelayInfo;
 use crate::nip05;
+use crate::notice::Notice;
 use crate::subscription::Subscription;
 use futures::SinkExt;
 use futures::StreamExt;
@@ -405,8 +406,13 @@ fn convert_to_msg(msg: String, max_bytes: Option<usize>) -> Result<NostrMessage>
 }
 
 /// Turn a string into a NOTICE message ready to send over a WebSocket
-fn make_notice_message(msg: &str) -> Message {
-    Message::text(json!(["NOTICE", msg]).to_string())
+fn make_notice_message(notice: Notice) -> Message {
+    let json = match notice {
+        Notice::Message(ref msg) => json!(["NOTICE", msg]),
+        Notice::EventResult(ref res) => json!(["OK", res.id, res.status.to_bool(), res.msg]),
+    };
+
+    Message::text(json.to_string())
 }
 
 struct ClientInfo {
@@ -435,7 +441,7 @@ async fn nostr_server(
     // we will send out the tx handle to any query we generate.
     let (query_tx, mut query_rx) = mpsc::channel::<db::QueryResult>(256);
     // Create channel for receiving NOTICEs
-    let (notice_tx, mut notice_rx) = mpsc::channel::<String>(32);
+    let (notice_tx, mut notice_rx) = mpsc::channel::<Notice>(32);
 
     // last time this client sent data (message, ping, etc.)
     let mut last_message_time = Instant::now();
@@ -458,14 +464,14 @@ async fn nostr_server(
     // and how many it received from queries.
     let mut client_published_event_count: usize = 0;
     let mut client_received_event_count: usize = 0;
-    debug!("new connection for client: {:?}, ip: {:?}", cid, conn.ip());
+    debug!("new connection for client: {}, ip: {:?}", cid, conn.ip());
     if let Some(ua) = client_info.user_agent {
-        debug!("client: {:?} has user-agent: {:?}", cid, ua);
+        debug!("client: {} has user-agent: {:?}", cid, ua);
     }
     loop {
         tokio::select! {
             _ = shutdown.recv() => {
-        info!("Shutting client connection down due to shutdown: {:?}, ip: {:?}", cid, conn.ip());
+        info!("Close connection down due to shutdown, client: {}, ip: {:?}", cid, conn.ip());
                 // server shutting down, exit loop
                 break;
             },
@@ -480,7 +486,7 @@ async fn nostr_server(
                 ws_stream.send(Message::Ping(Vec::new())).await.ok();
             },
             Some(notice_msg) = notice_rx.recv() => {
-                ws_stream.send(make_notice_message(&notice_msg)).await.ok();
+                ws_stream.send(make_notice_message(notice_msg)).await.ok();
             },
             Some(query_result) = query_rx.recv() => {
                 // database informed us of a query result we asked for
@@ -499,12 +505,15 @@ async fn nostr_server(
             Ok(global_event) = bcast_rx.recv() => {
                 // an event has been broadcast to all clients
                 // first check if there is a subscription for this event.
-                let matching_subs = conn.get_matching_subscriptions(&global_event);
-                for s in matching_subs {
+                for (s, sub) in conn.subscriptions() {
+                    if !sub.interested_in_event(&global_event) {
+                        continue;
+                    }
+
                     // TODO: serialize at broadcast time, instead of
                     // once for each consumer.
                     if let Ok(event_str) = serde_json::to_string(&global_event) {
-                        debug!("sub match for client: {:?}, sub: {:?}, event: {:?}",
+                        debug!("sub match for client: {}, sub: {:?}, event: {:?}",
                                cid, s,
                                global_event.get_event_id_prefix());
                         // create an event response and send it
@@ -525,7 +534,7 @@ async fn nostr_server(
                     },
             Some(Ok(Message::Binary(_))) => {
             ws_stream.send(
-                make_notice_message("binary messages are not accepted")).await.ok();
+                make_notice_message(Notice::message("binary messages are not accepted".into()))).await.ok();
                         continue;
                     },
                     Some(Ok(Message::Ping(_) | Message::Pong(_))) => {
@@ -535,8 +544,7 @@ async fn nostr_server(
                     },
             Some(Err(WsError::Capacity(MessageTooLong{size, max_size}))) => {
             ws_stream.send(
-                make_notice_message(
-                &format!("message too large ({} > {})",size, max_size))).await.ok();
+                make_notice_message(Notice::message(format!("message too large ({} > {})",size, max_size)))).await.ok();
                         continue;
             },
                     None |
@@ -544,17 +552,17 @@ async fn nostr_server(
              Err(WsError::AlreadyClosed | WsError::ConnectionClosed |
                  WsError::Protocol(tungstenite::error::ProtocolError::ResetWithoutClosingHandshake)))
                         => {
-                            debug!("websocket close from client: {:?}, ip: {:?}",cid, conn.ip());
+                            debug!("websocket close from client: {}, ip: {:?}",cid, conn.ip());
                         break;
                     },
                     Some(Err(WsError::Io(e))) => {
                         // IO errors are considered fatal
-                        warn!("IO error (client: {:?}, ip: {:?}): {:?}", cid, conn.ip(), e);
+                        warn!("IO error (client: {}, ip: {:?}): {:?}", cid, conn.ip(), e);
                         break;
                     }
                     x => {
                         // default condition on error is to close the client connection
-                        info!("unknown error (client: {:?}, ip: {:?}): {:?} (closing conn)", cid, conn.ip(), x);
+                        info!("unknown error (client: {}, ip: {:?}): {:?} (closing conn)", cid, conn.ip(), x);
                         break;
                     }
                 };
@@ -564,11 +572,12 @@ async fn nostr_server(
                     Ok(NostrMessage::EventMsg(ec)) => {
                         // An EventCmd needs to be validated to be converted into an Event
                         // handle each type of message
+                        let evid = ec.event_id().to_owned();
                         let parsed : Result<Event> = Result::<Event>::from(ec);
                         match parsed {
                             Ok(e) => {
                                 let id_prefix:String = e.id.chars().take(8).collect();
-                                debug!("successfully parsed/validated event: {:?} from client: {:?}", id_prefix, cid);
+                                debug!("successfully parsed/validated event: {:?} from client: {}", id_prefix, cid);
                                 // check if the event is too far in the future.
                                 if e.is_valid_timestamp(settings.options.reject_future_seconds) {
                                     // Write this to the database.
@@ -576,20 +585,22 @@ async fn nostr_server(
                                     event_tx.send(submit_event).await.ok();
                                     client_published_event_count += 1;
                 } else {
-                    info!("client {:?} sent a far future-dated event", cid);
+                    info!("client: {} sent a far future-dated event", cid);
                     if let Some(fut_sec) = settings.options.reject_future_seconds {
-                    ws_stream.send(make_notice_message(&format!("The event created_at field is out of the acceptable range (+{}sec) for this relay and was not stored.",fut_sec))).await.ok();
+                        let msg = format!("The event created_at field is out of the acceptable range (+{}sec) for this relay.",fut_sec);
+                        let notice = Notice::invalid(e.id, &msg);
+                        ws_stream.send(make_notice_message(notice)).await.ok();
                     }
                 }
                             },
-                            Err(_) => {
-                                info!("client: {:?} sent an invalid event", cid);
-                                ws_stream.send(make_notice_message("event was invalid")).await.ok();
+                            Err(e) => {
+                                info!("client: {} sent an invalid event", cid);
+                                ws_stream.send(make_notice_message(Notice::invalid(evid, &format!("{}", e)))).await.ok();
                             }
                         }
                     },
                     Ok(NostrMessage::SubMsg(s)) => {
-                        debug!("client {} requesting a subscription", cid);
+                        debug!("client: {} requesting a subscription", cid);
                         // subscription handling consists of:
                         // * registering the subscription so future events can be matched
                         // * making a channel to cancel to request later
@@ -606,7 +617,7 @@ async fn nostr_server(
                             },
                             Err(e) => {
                                 info!("Subscription error: {}", e);
-                                ws_stream.send(make_notice_message(&e.to_string())).await.ok();
+                                ws_stream.send(make_notice_message(Notice::message(format!("Subscription error: {}", e)))).await.ok();
                             }
                         }
                     },
@@ -625,23 +636,23 @@ async fn nostr_server(
                                 conn.unsubscribe(&c);
                             } else {
                                 info!("invalid command ignored");
-                                ws_stream.send(make_notice_message("could not parse command")).await.ok();
+                                ws_stream.send(make_notice_message(Notice::message("could not parse command".into()))).await.ok();
                             }
                     },
                     Err(Error::ConnError) => {
-                        debug!("got connection close/error, disconnecting client: {:?}, ip: {:?}",cid, conn.ip());
+                        debug!("got connection close/error, disconnecting client: {}, ip: {:?}",cid, conn.ip());
                         break;
                     }
                     Err(Error::EventMaxLengthError(s)) => {
-                        info!("client {:?} sent event larger ({} bytes) than max size", cid, s);
-                        ws_stream.send(make_notice_message("event exceeded max size")).await.ok();
+                        info!("client: {} sent event larger ({} bytes) than max size", cid, s);
+                        ws_stream.send(make_notice_message(Notice::message("event exceeded max size".into()))).await.ok();
                     },
                     Err(Error::ProtoParseError) => {
-                        info!("client {:?} sent event that could not be parsed", cid);
-                        ws_stream.send(make_notice_message("could not parse command")).await.ok();
+                        info!("client {} sent event that could not be parsed", cid);
+                        ws_stream.send(make_notice_message(Notice::message("could not parse command".into()))).await.ok();
                     },
                     Err(e) => {
-                        info!("got non-fatal error from client: {:?}, error: {:?}", cid, e);
+                        info!("got non-fatal error from client: {}, error: {:?}", cid, e);
                     },
                 }
             },
@@ -652,7 +663,7 @@ async fn nostr_server(
         stop_tx.send(()).ok();
     }
     info!(
-        "stopping connection for client: {:?}, ip: {:?} (client sent {} event(s), received {})",
+        "stopping connection for client: {}, ip: {:?} (client sent {} event(s), received {})",
         cid,
         conn.ip(),
         client_published_event_count,