refactor: Remove unused imports and handle unused results

This commit performs general code cleanup to improve quality and address compiler warnings.

Unused import statements have been removed from several files, including `HashSet`, `anyhow`, `log::error`, `serde::Deserialize`, and `serde_json::Value`. This declutters the code and makes dependencies clearer.

Additionally, the `Result` returned by `RelayMessage::send_ok` and `RelayMessage::send_notice` is now explicitly ignored. This resolves `must_use` warnings for these fire-and-forget message sending functions, where error handling is not critical to the application's flow.

src/database.rs

@@ -4,7 +4,6 @@ use anyhow::Result;
 use log::error;
 use sqlx::sqlite::SqlitePool;
 use sqlx::{Row, query};
-use std::collections::HashSet;
 
 pub async fn init_database(pool: &SqlitePool) -> Result<()> {
     let create_events_table = r#"

src/handlers.rs

@@ -1,6 +1,5 @@
-use anyhow::{Result, anyhow};
+use anyhow::Result;
 use httparse::{EMPTY_HEADER, Request};
-use log::{error, info};
 use sqlx::SqlitePool;
 use std::collections::{HashMap, HashSet};
 use std::sync::Arc;

src/models.rs

@@ -1,5 +1,5 @@
 use crate::nostr::Filter;
-use serde::{Deserialize, Serialize};
+use serde::Serialize;
 use std::collections::HashMap;
 use tokio::sync::mpsc;
 use uuid::Uuid;

src/nostr/event.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
-use log::{debug, error, info};
+use log::{debug, info};
 use secp256k1::{
     Message as SecpMessage, Secp256k1, XOnlyPublicKey, schnorr::Signature as SchnorrSignature,
 };
-use serde_json::{Value, json};
+use serde_json::json;
 use sha2::{Digest, Sha256};
 use sqlx::SqlitePool;
 use std::{
@@ -31,7 +31,7 @@ pub trait NostrEventExt {
 impl NostrEventExt for NostrEvent {
     // 根据 Nostr 协议规则序列化事件，用于计算事件 ID
     fn serialize_for_id(&self) -> String {
-        let serialized = json!([
+        json!([
             0, // 用于 ID 计算的协议版本，Nostr 当前为 0
             self.pubkey,
             self.created_at,
@@ -39,8 +39,7 @@ impl NostrEventExt for NostrEvent {
             self.tags,
             self.content
         ])
-        .to_string();
-        serialized
+        .to_string()
     }
 
     // 验证事件的有效性（ID、时间戳、标签数量、签名）
@@ -259,7 +258,7 @@ impl NostrEventExt for NostrEvent {
     ) -> Result<(), anyhow::Error> {
         // 1. 验证事件类型是否为 NIP-42 认证事件 (kind 22242)
         if self.kind != 22242 {
-            RelayMessage::send_ok(
+            let _ = RelayMessage::send_ok(
                 &self.id,
                 false,
                 "AUTH event must be kind 22242".to_string(), // 根据协议，OK 消息应包含事件 ID
@@ -271,7 +270,10 @@ impl NostrEventExt for NostrEvent {
 
         // 2. 验证事件签名是否有效
         if !self.verify() {
-            RelayMessage::send_notice("Invalid AUTH event signature".to_string(), to_client_msg_tx)
+            let _ = RelayMessage::send_notice(
+                "Invalid AUTH event signature".to_string(),
+                to_client_msg_tx,
+            )
             .await;
             return Ok(());
         }
@@ -293,7 +295,7 @@ impl NostrEventExt for NostrEvent {
         let challenge = match challenge {
             Some(c) => c,
             None => {
-                RelayMessage::send_notice(
+                let _ = RelayMessage::send_notice(
                     "AUTH event missing challenge tag".to_string(),
                     to_client_msg_tx,
                 )
@@ -318,7 +320,10 @@ impl NostrEventExt for NostrEvent {
         };
 
         if !is_valid_challenge {
-            RelayMessage::send_notice("Invalid or expired challenge".to_string(), to_client_msg_tx)
+            let _ = RelayMessage::send_notice(
+                "Invalid or expired challenge".to_string(),
+                to_client_msg_tx,
+            )
             .await;
             return Ok(());
         }
@@ -329,7 +334,7 @@ impl NostrEventExt for NostrEvent {
             .unwrap_or(Duration::ZERO)
             .as_secs();
         if self.created_at < now.saturating_sub(60) || self.created_at > now + 60 {
-            RelayMessage::send_notice(
+            let _ = RelayMessage::send_notice(
                 "AUTH event timestamp out of acceptable range (must be within 60s of now)"
                     .to_string(),
                 to_client_msg_tx,
@@ -347,7 +352,7 @@ impl NostrEventExt for NostrEvent {
 
         info!("Client authenticated with pubkey: {}", self.pubkey);
         // 根据 NIP-42，认证成功也应该回复 OK 消息
-        RelayMessage::send_ok(
+        let _ = RelayMessage::send_ok(
             &self.id,
             true,
             "Authentication successful.".to_string(),

src/nostr/filter.rs

@@ -2,7 +2,6 @@ use anyhow::Result;
 use log::debug;
 use sqlx::sqlite::SqlitePool;
 use sqlx::{Execute, QueryBuilder, Row};
-use std::collections::HashMap;
 
 use crate::constants::{DEFAULT_LIMIT, MAX_LIMIT};
 use crate::nostr::Filter;

src/nostr/messages.rs

@@ -3,6 +3,7 @@ use log::error;
 use serde_json;
 use tokio::sync::mpsc;
 pub struct RelayMessage;
+use anyhow::{Result, anyhow};
 
 impl RelayMessage {
     // 发送 OK 消息 (NIP-20)
@@ -23,27 +24,46 @@ impl RelayMessage {
         event: &NostrEvent,
         sub_id: &str,
         to_client_msg_tx: &mpsc::Sender<String>,
-    ) {
+    ) -> Result<()> {
         // 尝试将 NostrEvent 序列化为 JSON 字符串
         let event_json = match serde_json::to_string(event) {
             Ok(json) => json,
             Err(e) => {
                 error!("Failed to serialize event {} for sending: {}", event.id, e);
-                return; // 序列化失败则不发送
+                return Err(anyhow!(
+                    "Failed to serialize event {} for sending: {}",
+                    event.id,
+                    e
+                ));
             }
         };
         let msg = format!("[\"EVENT\", \"{}\", {}]", sub_id, event_json);
-        if let Err(e) = to_client_msg_tx.send(msg).await {
-            // 此错误通常表示客户端的接收端已关闭（客户端已断开）
+        match to_client_msg_tx.send(msg).await {
+            Ok(_) => Ok(()),
+            Err(e) => {
                 error!("Failed to send EVENT message (sub_id: {}): {}", sub_id, e);
+                Err(anyhow!(
+                    "Failed to send EVENT message (sub_id: {}): {}",
+                    sub_id,
+                    e
+                ))
+            }
         }
     }
 
     // 发送 EOSE 消息 (NIP-15)
-    pub async fn send_eose(sub_id: &str, to_client_msg_tx: &mpsc::Sender<String>) {
+    pub async fn send_eose(sub_id: &str, to_client_msg_tx: &mpsc::Sender<String>) -> Result<()> {
         let msg = format!("[\"EOSE\", \"{}\"]", sub_id);
-        if let Err(e) = to_client_msg_tx.send(msg).await {
+        match to_client_msg_tx.send(msg).await {
+            Ok(_) => Ok(()),
+            Err(e) => {
                 error!("Failed to send EOSE message (sub_id: {}): {}", sub_id, e);
+                Err(anyhow!(
+                    "Failed to send EOSE message (sub_id: {}): {}",
+                    sub_id,
+                    e
+                ))
+            }
         }
     }
 
@@ -52,21 +72,40 @@ impl RelayMessage {
         sub_id: &str,
         message: String,
         to_client_msg_tx: &mpsc::Sender<String>,
-    ) {
+    ) -> Result<()> {
         let msg = format!("[\"CLOSED\", \"{}\", \"{}\"]", sub_id, message);
-        if let Err(e) = to_client_msg_tx.send(msg).await {
+        match to_client_msg_tx.send(msg).await {
+            Ok(_) => Ok(()),
+            Err(e) => {
                 error!("Failed to send CLOSED message (sub_id: {}): {}", sub_id, e);
+                Err(anyhow!(
+                    "Failed to send CLOSED message (sub_id: {}): {}",
+                    sub_id,
+                    e
+                ))
+            }
         }
     }
 
     // 发送 NOTICE 消息 (NIP-01)
-    pub async fn send_notice(message: String, to_client_msg_tx: &mpsc::Sender<String>) {
+    pub async fn send_notice(
+        message: String,
+        to_client_msg_tx: &mpsc::Sender<String>,
+    ) -> Result<()> {
         let msg = format!("[\"NOTICE\", \"{}\"]", message);
-        if let Err(e) = to_client_msg_tx.send(msg).await {
+        match to_client_msg_tx.send(msg).await {
+            Ok(_) => Ok(()),
+            Err(e) => {
                 error!(
                     "Failed to send NOTICE message (message: {}): {}",
                     message, e
                 );
+                Err(anyhow!(
+                    "Failed to send NOTICE message (message: {}): {}",
+                    message,
+                    e
+                ))
+            }
         }
     }
 }

src/ws_logic.rs

@@ -9,7 +9,7 @@ use std::{
 };
 use tokio::net::TcpStream;
 use tokio::sync::{RwLock, broadcast, mpsc};
-use tokio_tungstenite::{WebSocketStream, accept_async, tungstenite::protocol::Message};
+use tokio_tungstenite::{accept_async, tungstenite::protocol::Message};
 use uuid::Uuid;
 
 use crate::constants::{CLIENT_CHANNEL_SIZE, MAX_FILTERS_PER_REQ, MAX_SUBSCRIPTIONS, SERVER_INFO};
@@ -18,7 +18,7 @@ use crate::nostr::event::NostrEventExt;
 use crate::nostr::filter::FilterExt;
 use crate::nostr::messages::RelayMessage;
 use crate::nostr::utils::extract_p_tags_from_vec;
-use crate::nostr::{ClientMessage, Filter, NostrEvent};
+use crate::nostr::{Filter, NostrEvent};
 
 pub async fn handle_ws_connection(
     stream: TcpStream,
@@ -77,7 +77,13 @@ pub async fn handle_ws_connection(
                     let conn = client_conn_for_send.read().await;
                     for (sub_id, subscription) in &conn.subscriptions {
                         if subscription.filters.iter().any(|filter| filter.matches(&event)) {
-                            RelayMessage::send_event(&event, sub_id, &conn.sender).await;
+                            match RelayMessage::send_event(&event, sub_id, &conn.sender).await {
+                                Ok(()) => debug!("Sent event to client {}", client_id),
+                                Err(e) => {
+                                    error!("Failed to send event to client {}: {}", client_id, e);
+                                    break;
+                                },
+                            }
                         }
                     }
                 }
@@ -124,8 +130,21 @@ pub async fn handle_ws_connection(
                     .await
                     {
                         error!("Error handling message for client {}: {}", client_id, e);
-                        RelayMessage::send_notice(format!("Invalid message: {}", e), &client_tx)
-                            .await;
+                        match RelayMessage::send_notice(
+                            format!("Invalid message: {}", e),
+                            &client_tx,
+                        )
+                        .await
+                        {
+                            Ok(()) => debug!("Sent error notice to client {}", client_id),
+                            Err(e) => {
+                                debug!(
+                                    "Failed to send error notice to client {}: {}",
+                                    client_id, e
+                                );
+                                return;
+                            }
+                        };
                     }
                 });
             }
@@ -185,7 +204,7 @@ pub async fn handle_message(
                         .to_string(),
                     to_client_msg_tx,
                 )
-                .await;
+                .await?;
                 return Ok(());
             }
             let sub_id = arr
@@ -203,7 +222,7 @@ pub async fn handle_message(
                         format!("Maximum subscriptions ({}) exceeded", MAX_SUBSCRIPTIONS),
                         to_client_msg_tx,
                     )
-                    .await;
+                    .await?;
                     return Ok(());
                 }
             }
@@ -215,7 +234,7 @@ pub async fn handle_message(
                         format!("Maximum filters ({}) exceeded", MAX_FILTERS_PER_REQ),
                         to_client_msg_tx,
                     )
-                    .await;
+                    .await?;
                     return Ok(());
                 }
                 let filter: Filter = serde_json::from_value(arr[i].clone())
@@ -239,12 +258,12 @@ pub async fn handle_message(
             for filter in &filters {
                 let events = filter.select(pool).await?; // 使用 FilterExt
                 for event in events {
-                    RelayMessage::send_event(&event, &sub_id, to_client_msg_tx).await;
+                    RelayMessage::send_event(&event, &sub_id, to_client_msg_tx).await?;
                 }
             }
 
             // 发送 EOSE 消息，表示历史事件已发送完毕
-            RelayMessage::send_eose(&sub_id, to_client_msg_tx).await;
+            RelayMessage::send_eose(&sub_id, to_client_msg_tx).await?;
             Ok(())
         }
 
@@ -279,26 +298,43 @@ pub async fn handle_message(
                 if SERVER_INFO.auth_required {
                     let conn = client_conn_clone.read().await;
                     if !conn.authenticated {
-                        RelayMessage::send_closed(
+                        match RelayMessage::send_closed(
                             // NIP-42 Auth: Forbid unauthenticated EVENT
                             &conn.id.to_string(), // 使用 client_id 作为 sub_id 来匹配 AUTH 挑战
                             "auth-required: Authentication required to publish events".to_string(),
                             &to_client_msg_tx_clone,
                         )
-                        .await;
+                        .await
+                        {
+                            Ok(_) => debug!("Client {}: Authentication challenge sent.", conn.id),
+                            Err(e) => {
+                                debug!("Failed to send authentication challenge: {}", e);
+                                return;
+                            }
+                        };
                         debug!("Client {}: Not authenticated, event rejected.", conn.id);
                         return;
                     }
                     let trust_accounts_guard = trust_accounts_clone.read().await;
                     if !trust_accounts_guard.contains(&event_clone.pubkey) {
-                        RelayMessage::send_closed(
+                        match RelayMessage::send_closed(
                             // NIP-42 Auth: Forbid unauthorized EVENT
                             &conn.id.to_string(),
                             "restricted: You are not in the trust list to publish events"
                                 .to_string(),
                             &to_client_msg_tx_clone,
                         )
-                        .await;
+                        .await
+                        {
+                            Ok(_) => debug!(
+                                "Client {}: Pubkey {} not in trust list, authentication challenge sent.",
+                                conn.id, event_clone.pubkey
+                            ),
+                            Err(e) => {
+                                error!("Failed to send authentication challenge: {}", e);
+                                return;
+                            }
+                        };
                         debug!(
                             "Client {}: Pubkey {} not in trust list, event rejected.",
                             conn.id, event_clone.pubkey
@@ -369,7 +405,7 @@ pub async fn handle_message(
                 "Subscription cancelled".to_string(),
                 to_client_msg_tx,
             )
-            .await;
+            .await?;
             Ok(())
         }
 
@@ -379,7 +415,7 @@ pub async fn handle_message(
                     "AUTH message requires an event: [\"AUTH\", <auth_event>]".to_string(),
                     to_client_msg_tx,
                 )
-                .await;
+                .await?;
                 return Ok(());
             }