yamlbase 0.7.2

A lightweight SQL server that serves YAML-defined tables over standard SQL protocols
Documentation 
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use std::sync::Arc;
use tokio::net::TcpStream;
use tracing::error;

use crate::config::{Config, Protocol};
use crate::database::Storage;
use crate::protocol::{MySqlProtocol, PostgresProtocol};
use crate::protocol::shared_catalog::SharedCatalog;

pub struct Connection {
    config: Arc<Config>,
    storage: Arc<Storage>,
    shared_catalog: Option<SharedCatalog>,
}

impl Connection {
    pub fn new(config: Arc<Config>, storage: Arc<Storage>) -> Self {
        Self { 
            config, 
            storage,
            shared_catalog: None,
        }
    }
    
    pub async fn new_with_shared_catalog(
        config: Arc<Config>, 
        storage: Arc<Storage>
    ) -> crate::Result<Self> {
        let shared_catalog = if matches!(config.protocol, Protocol::Postgres) {
            Some(crate::protocol::shared_catalog::create_shared_catalog(storage.clone()).await?)
        } else {
            None
        };
        
        Ok(Self { 
            config, 
            storage,
            shared_catalog,
        })
    }
    
    pub fn new_with_shared_catalog_ref(
        config: Arc<Config>, 
        storage: Arc<Storage>,
        shared_catalog: SharedCatalog
    ) -> Self {
        Self { 
            config, 
            storage,
            shared_catalog: Some(shared_catalog),
        }
    }

    pub async fn handle(&self, stream: TcpStream) -> crate::Result<()> {
        match self.config.protocol {
            Protocol::Postgres => {
                let mut protocol = if let Some(shared_catalog) = &self.shared_catalog {
                    PostgresProtocol::new_with_shared_catalog(
                        self.config.clone(), 
                        self.storage.clone(),
                        shared_catalog.clone()
                    ).await?
                } else {
                    PostgresProtocol::new(self.config.clone(), self.storage.clone()).await?
                };
                protocol.handle_connection(stream).await
            }
            Protocol::Mysql => {
                let mut protocol =
                    MySqlProtocol::new(self.config.clone(), self.storage.clone()).await?;
                protocol.handle_connection(stream).await
            }
            Protocol::Sqlserver => {
                error!("SQL Server protocol not yet implemented");
                Err(crate::YamlBaseError::NotImplemented(
                    "SQL Server protocol not yet implemented".to_string(),
                ))
            }
        }
    }
}