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feat: impl pubsub in metasrv (GreptimeTeam#2045)
* feat: impl pubsub * add test_subscriber_disconnect unit test * chore: cr * cr * cr
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Copyright 2023 Greptime Team | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use api::v1::meta::{HeartbeatRequest, Role}; | ||
| use async_trait::async_trait; | ||
|
|
||
| use crate::error::Result; | ||
| use crate::handler::{HeartbeatAccumulator, HeartbeatHandler}; | ||
| use crate::metasrv::Context; | ||
| use crate::pubsub::{Message, PublishRef}; | ||
|
|
||
| pub struct PublishHeartbeatHandler { | ||
| publish: PublishRef, | ||
| } | ||
|
|
||
| impl PublishHeartbeatHandler { | ||
| pub fn new(publish: PublishRef) -> PublishHeartbeatHandler { | ||
| PublishHeartbeatHandler { publish } | ||
| } | ||
| } | ||
|
|
||
| #[async_trait] | ||
| impl HeartbeatHandler for PublishHeartbeatHandler { | ||
| fn is_acceptable(&self, role: Role) -> bool { | ||
| role == Role::Datanode | ||
| } | ||
|
|
||
| async fn handle( | ||
| &self, | ||
| req: &HeartbeatRequest, | ||
| _: &mut Context, | ||
| _: &mut HeartbeatAccumulator, | ||
| ) -> Result<()> { | ||
| let msg = Message::Heartbeat(Box::new(req.clone())); | ||
| self.publish.send_msg(msg).await; | ||
|
|
||
| Ok(()) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright 2023 Greptime Team | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use api::v1::meta::HeartbeatRequest; | ||
|
|
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| mod publish; | ||
| mod subscribe_manager; | ||
| mod subscriber; | ||
| #[cfg(test)] | ||
| mod tests; | ||
|
|
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| pub use publish::{DefaultPublish, Publish, PublishRef}; | ||
| pub use subscribe_manager::{ | ||
| AddSubRequest, DefaultSubscribeManager, SubscribeManager, SubscribeManagerRef, SubscribeQuery, | ||
| UnSubRequest, | ||
| }; | ||
| pub use subscriber::{Subscriber, SubscriberRef, Transport}; | ||
|
|
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| /// Subscribed topic type, determined by the ability of meta. | ||
| #[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)] | ||
| pub enum Topic { | ||
| Heartbeat, | ||
| } | ||
|
|
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| #[derive(Clone, Debug)] | ||
| pub enum Message { | ||
| Heartbeat(Box<HeartbeatRequest>), | ||
| } | ||
|
|
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| impl Message { | ||
| pub fn topic(&self) -> Topic { | ||
| match self { | ||
| Message::Heartbeat(_) => Topic::Heartbeat, | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // Copyright 2023 Greptime Team | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use std::fmt::Debug; | ||
| use std::marker::PhantomData; | ||
| use std::sync::Arc; | ||
|
|
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| use common_telemetry::error; | ||
|
|
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| use crate::pubsub::{Message, SubscribeManager, Transport, UnSubRequest}; | ||
|
|
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| /// This trait provides a `send_msg` method that can be used by other modules | ||
| /// of meta to publish [Message]. | ||
| #[async_trait::async_trait] | ||
| pub trait Publish: Send + Sync { | ||
| async fn send_msg(&self, message: Message); | ||
| } | ||
|
|
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| pub type PublishRef = Arc<dyn Publish>; | ||
|
|
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| /// The default implementation of [Publish] | ||
| pub struct DefaultPublish<M, T> { | ||
| subscribe_manager: Arc<M>, | ||
| _transport: PhantomData<T>, | ||
| } | ||
|
|
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| impl<M, T> DefaultPublish<M, T> { | ||
| pub fn new(subscribe_manager: Arc<M>) -> Self { | ||
| Self { | ||
| subscribe_manager, | ||
| _transport: PhantomData, | ||
| } | ||
| } | ||
| } | ||
|
|
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| #[async_trait::async_trait] | ||
| impl<M, T> Publish for DefaultPublish<M, T> | ||
| where | ||
| M: SubscribeManager<T>, | ||
| T: Transport + Debug, | ||
| { | ||
| async fn send_msg(&self, message: Message) { | ||
| let sub_list = self | ||
| .subscribe_manager | ||
| .subscribers_by_topic(&message.topic()); | ||
|
|
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| for sub in sub_list { | ||
| if sub.transport_msg(message.clone()).await.is_err() { | ||
| // If an error occurs, we consider the subscriber offline, | ||
| // so un_subscribe here. | ||
| let req = UnSubRequest { | ||
| subscriber_id: sub.id(), | ||
| }; | ||
|
|
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| if let Err(e) = self.subscribe_manager.un_subscribe(req.clone()) { | ||
| error!(e; "failed to un_subscribe, req: {:?}", req); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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