feat: add handler execution timer (GreptimeTeam#1791)

* feat: add handler execution timer

* fix: by cr

src/meta-srv/src/handler.rs

@@ -25,12 +25,12 @@ use api::v1::meta::{
 pub use check_leader_handler::CheckLeaderHandler;
 pub use collect_stats_handler::CollectStatsHandler;
 use common_meta::instruction::{Instruction, InstructionReply};
-use common_telemetry::{debug, info, warn};
+use common_telemetry::{debug, info, timer, warn};
 use dashmap::DashMap;
 pub use failure_handler::RegionFailureHandler;
 pub use keep_lease_handler::KeepLeaseHandler;
 use metrics::{decrement_gauge, increment_gauge};
-pub use on_leader_start::OnLeaderStartHandler;
+pub use on_leader_start_handler::OnLeaderStartHandler;
 pub use persist_stats_handler::PersistStatsHandler;
 pub use response_header_handler::ResponseHeaderHandler;
 use snafu::{OptionExt, ResultExt};
@@ -40,7 +40,7 @@ use tokio::sync::{oneshot, Notify, RwLock};
 use self::node_stat::Stat;
 use crate::error::{self, DeserializeFromJsonSnafu, Result, UnexpectedInstructionReplySnafu};
 use crate::metasrv::Context;
-use crate::metrics::METRIC_META_HEARTBEAT_CONNECTION_NUM;
+use crate::metrics::{METRIC_META_HANDLER_EXECUTE, METRIC_META_HEARTBEAT_CONNECTION_NUM};
 use crate::sequence::Sequence;
 use crate::service::mailbox::{
     BroadcastChannel, Channel, Mailbox, MailboxReceiver, MailboxRef, MessageId,
@@ -52,7 +52,7 @@ pub(crate) mod failure_handler;
 mod keep_lease_handler;
 pub mod mailbox_handler;
 pub mod node_stat;
-mod on_leader_start;
+mod on_leader_start_handler;
 mod persist_stats_handler;
 pub(crate) mod region_lease_handler;
 mod response_header_handler;
@@ -61,6 +61,12 @@ mod response_header_handler;
 pub trait HeartbeatHandler: Send + Sync {
     fn is_acceptable(&self, role: Role) -> bool;
 
+    fn name(&self) -> &'static str {
+        let type_name = std::any::type_name::<Self>();
+        // short name
+        type_name.split("::").last().unwrap_or(type_name)
+    }
+
     async fn handle(
         &self,
         req: &HeartbeatRequest,
@@ -171,9 +177,22 @@ impl Pushers {
     }
 }
 
+struct NameCachedHandler {
+    name: &'static str,
+    handler: Box<dyn HeartbeatHandler>,
+}
+
+impl NameCachedHandler {
+    fn new(handler: impl HeartbeatHandler + 'static) -> Self {
+        let name = handler.name();
+        let handler = Box::new(handler);
+        Self { name, handler }
+    }
+}
+
 #[derive(Clone, Default)]
 pub struct HeartbeatHandlerGroup {
-    handlers: Arc<RwLock<Vec<Box<dyn HeartbeatHandler>>>>,
+    handlers: Arc<RwLock<Vec<NameCachedHandler>>>,
     pushers: Pushers,
 }
 
@@ -187,7 +206,7 @@ impl HeartbeatHandlerGroup {
 
     pub async fn add_handler(&self, handler: impl HeartbeatHandler + 'static) {
         let mut handlers = self.handlers.write().await;
-        handlers.push(Box::new(handler));
+        handlers.push(NameCachedHandler::new(handler));
     }
 
     pub async fn register(&self, key: impl AsRef<str>, pusher: Pusher) {
@@ -223,13 +242,14 @@ impl HeartbeatHandlerGroup {
                 err_msg: format!("invalid role: {:?}", req.header),
             })?;
 
-        for h in handlers.iter() {
+        for NameCachedHandler { name, handler } in handlers.iter() {
             if ctx.is_skip_all() {
                 break;
             }
 
-            if h.is_acceptable(role) {
-                h.handle(&req, &mut ctx, &mut acc).await?;
+            if handler.is_acceptable(role) {
+                let _timer = timer!(METRIC_META_HANDLER_EXECUTE, &[("name", *name)]);
+                handler.handle(&req, &mut ctx, &mut acc).await?;
             }
         }
         let header = std::mem::take(&mut acc.header);
@@ -383,7 +403,11 @@ mod tests {
     use api::v1::meta::{MailboxMessage, RequestHeader, Role, PROTOCOL_VERSION};
     use tokio::sync::mpsc;
 
-    use crate::handler::{HeartbeatHandlerGroup, HeartbeatMailbox, Pusher};
+    use crate::handler::mailbox_handler::MailboxHandler;
+    use crate::handler::{
+        CheckLeaderHandler, CollectStatsHandler, HeartbeatHandlerGroup, HeartbeatMailbox,
+        OnLeaderStartHandler, PersistStatsHandler, Pusher, ResponseHeaderHandler,
+    };
     use crate::sequence::Sequence;
     use crate::service::mailbox::{Channel, MailboxReceiver, MailboxRef};
     use crate::service::store::memory::MemStore;
@@ -452,4 +476,25 @@ mod tests {
 
         (mailbox, receiver)
     }
+
+    #[tokio::test]
+    async fn test_handler_name() {
+        let group = HeartbeatHandlerGroup::default();
+        group.add_handler(ResponseHeaderHandler::default()).await;
+        group.add_handler(CheckLeaderHandler::default()).await;
+        group.add_handler(OnLeaderStartHandler::default()).await;
+        group.add_handler(CollectStatsHandler::default()).await;
+        group.add_handler(MailboxHandler::default()).await;
+        group.add_handler(PersistStatsHandler::default()).await;
+
+        let handlers = group.handlers.read().await;
+
+        assert_eq!(6, handlers.len());
+        assert_eq!("ResponseHeaderHandler", handlers[0].handler.name());
+        assert_eq!("CheckLeaderHandler", handlers[1].handler.name());
+        assert_eq!("OnLeaderStartHandler", handlers[2].handler.name());
+        assert_eq!("CollectStatsHandler", handlers[3].handler.name());
+        assert_eq!("MailboxHandler", handlers[4].handler.name());
+        assert_eq!("PersistStatsHandler", handlers[5].handler.name());
+    }
 }

src/meta-srv/src/metrics.rs

@@ -17,3 +17,4 @@ pub(crate) const METRIC_META_CREATE_SCHEMA: &str = "meta.create_schema";
 pub(crate) const METRIC_META_KV_REQUEST: &str = "meta.kv_request";
 pub(crate) const METRIC_META_ROUTE_REQUEST: &str = "meta.route_request";
 pub(crate) const METRIC_META_HEARTBEAT_CONNECTION_NUM: &str = "meta.heartbeat_connection_num";
+pub(crate) const METRIC_META_HANDLER_EXECUTE: &str = "meta.handler_execute";