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feat(remote_wal): introduce wal meta to organize wal codes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // 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. | ||
|
|
||
| pub mod demand_builder; | ||
|
|
||
| pub use demand_builder::WalMetaDemandBuilder; | ||
| use serde::{Deserialize, Serialize}; | ||
| use snafu::OptionExt; | ||
|
|
||
| use crate::error::{MissingKafkaTopicManagerSnafu, Result}; | ||
| use crate::kv_backend::KvBackendRef; | ||
| use crate::wal::kafka::{KafkaTopic as Topic, KafkaTopicManager as TopicManager}; | ||
| use crate::wal::{WalOptions, WalProvider}; | ||
|
|
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| /// Wal metadata allocated to a table. | ||
| #[derive(Debug, Serialize, Deserialize, Default)] | ||
| pub struct WalMeta { | ||
| pub region_topics: Vec<Topic>, | ||
| } | ||
|
|
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| /// The allocator user shall state what wal meta it demands. | ||
| pub struct WalMetaDemand { | ||
| pub num_topics: Option<usize>, | ||
| } | ||
|
|
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| /// The allocator responsible for allocating wal metadata for a table. | ||
| #[derive(Default)] | ||
| pub struct WalMetaAllocator { | ||
| wal_provider: WalProvider, | ||
| topic_manager: Option<TopicManager>, | ||
| } | ||
|
|
||
| impl WalMetaAllocator { | ||
| pub async fn try_new(wal_opts: &WalOptions, kv_backend: &KvBackendRef) -> Result<Self> { | ||
| let mut this = Self { | ||
| wal_provider: wal_opts.provider.clone(), | ||
| ..Default::default() | ||
| }; | ||
|
|
||
| match this.wal_provider { | ||
| WalProvider::RaftEngine => {} | ||
| WalProvider::Kafka => { | ||
| let topic_manager = | ||
| TopicManager::try_new(wal_opts.kafka_opts.as_ref(), kv_backend).await?; | ||
| this.topic_manager = Some(topic_manager); | ||
| } | ||
| } | ||
|
|
||
| Ok(this) | ||
| } | ||
|
|
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| /// Allocate wal meta according to the wal provider. | ||
| pub async fn try_alloc(&self, demand: WalMetaDemand) -> Result<WalMeta> { | ||
| let mut allocated = WalMeta::default(); | ||
|
|
||
| if let Some(num_topics) = demand.num_topics.as_ref() { | ||
| allocated.region_topics = self.try_alloc_topics(*num_topics).await?; | ||
| } | ||
|
|
||
| Ok(allocated) | ||
| } | ||
|
|
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| pub async fn try_alloc_topics(&self, num_topics: usize) -> Result<Vec<Topic>> { | ||
| let topics = self | ||
| .topic_manager | ||
| .as_ref() | ||
| .context(MissingKafkaTopicManagerSnafu)? | ||
| .select_topics(num_topics); | ||
| Ok(topics) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // 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 crate::wal::meta::WalMetaDemand; | ||
|
|
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| #[derive(Default)] | ||
| pub struct WalMetaDemandBuilder { | ||
| num_topics: Option<usize>, | ||
| } | ||
|
|
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| impl WalMetaDemandBuilder { | ||
| pub fn new() -> Self { | ||
| Self::default() | ||
| } | ||
|
|
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| pub fn with_num_topics(&mut self, num_topics: usize) -> &mut Self { | ||
| self.num_topics = Some(num_topics); | ||
| self | ||
| } | ||
|
|
||
| pub fn build(&self) -> WalMetaDemand { | ||
| WalMetaDemand { | ||
| num_topics: self.num_topics, | ||
| } | ||
| } | ||
| } |
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