greptimedb/src/servers/tests/mod.rs

// Copyright 2022 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::collections::HashMap;
use std::sync::{Arc, RwLock};

use async_trait::async_trait;
use catalog::local::{MemoryCatalogManager, MemoryCatalogProvider, MemorySchemaProvider};
use catalog::{CatalogList, CatalogProvider, SchemaProvider};
use common_catalog::consts::{DEFAULT_CATALOG_NAME, DEFAULT_SCHEMA_NAME};
use common_query::Output;
use query::{QueryEngineFactory, QueryEngineRef};
use servers::error::Result;
use servers::query_handler::{
    ScriptHandler, ScriptHandlerRef, SqlQueryHandler, SqlQueryHandlerRef,
};
use table::test_util::MemTable;

mod http;
mod mysql;
use script::engine::{CompileContext, EvalContext, Script, ScriptEngine};
use script::python::{PyEngine, PyScript};
use session::context::QueryContextRef;

mod opentsdb;
mod postgres;

struct DummyInstance {
    query_engine: QueryEngineRef,
    py_engine: Arc<PyEngine>,
    scripts: RwLock<HashMap<String, Arc<PyScript>>>,
}

impl DummyInstance {
    fn new(query_engine: QueryEngineRef) -> Self {
        Self {
            py_engine: Arc::new(PyEngine::new(query_engine.clone())),
            scripts: RwLock::new(HashMap::new()),
            query_engine,
        }
    }
}

#[async_trait]
impl SqlQueryHandler for DummyInstance {
    async fn do_query(&self, query: &str, query_ctx: QueryContextRef) -> Vec<Result<Output>> {
        let plan = self.query_engine.sql_to_plan(query, query_ctx).unwrap();
        let output = self.query_engine.execute(&plan).await.unwrap();
        vec![Ok(output)]
    }

    async fn do_statement_query(
        &self,
        _stmt: sql::statements::statement::Statement,
        _query_ctx: QueryContextRef,
    ) -> Result<Output> {
        unimplemented!()
    }
}

#[async_trait]
impl ScriptHandler for DummyInstance {
    async fn insert_script(&self, name: &str, script: &str) -> Result<()> {
        let script = self
            .py_engine
            .compile(script, CompileContext::default())
            .await
            .unwrap();
        self.scripts
            .write()
            .unwrap()
            .insert(name.to_string(), Arc::new(script));

        Ok(())
    }

    async fn execute_script(&self, name: &str) -> Result<Output> {
        let py_script = self.scripts.read().unwrap().get(name).unwrap().clone();

        Ok(py_script.execute(EvalContext::default()).await.unwrap())
    }
}

fn create_testing_instance(table: MemTable) -> DummyInstance {
    let table_name = table.table_name().to_string();
    let table = Arc::new(table);

    let schema_provider = Arc::new(MemorySchemaProvider::new());
    let catalog_provider = Arc::new(MemoryCatalogProvider::new());
    let catalog_list = Arc::new(MemoryCatalogManager::default());
    schema_provider.register_table(table_name, table).unwrap();
    catalog_provider
        .register_schema(DEFAULT_SCHEMA_NAME.to_string(), schema_provider)
        .unwrap();
    catalog_list
        .register_catalog(DEFAULT_CATALOG_NAME.to_string(), catalog_provider)
        .unwrap();

    let factory = QueryEngineFactory::new(catalog_list);
    let query_engine = factory.query_engine();
    DummyInstance::new(query_engine)
}

fn create_testing_script_handler(table: MemTable) -> ScriptHandlerRef {
    Arc::new(create_testing_instance(table)) as _
}

fn create_testing_sql_query_handler(table: MemTable) -> SqlQueryHandlerRef {
    Arc::new(create_testing_instance(table)) as _
}