cqlls 1.0.1

/*
MIT License

Copyright (c) 2025-2026 アクゼスティア

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
use futures::stream::StreamExt;
use scylla::{
    DeserializeRow,
    client::session::Session,
    client::session_builder::SessionBuilder,
    statement::{Statement, prepared::PreparedStatement},
};
use std::fmt;
use std::time::Duration;

use log::info;
use rustls::pki_types::{CertificateDer, pem::PemObject};
use rustls::{ClientConfig, RootCertStore};
use rustls_pemfile;
use std::fs::File;
use std::io::BufReader;
use std::sync::Arc;

#[derive(DeserializeRow)]
pub struct Table {
    pub keyspace_name: String,
    pub table_name: String,
}

impl Table {
    pub fn united(&self) -> String {
        format!("{}.{}", self.keyspace_name, self.table_name)
    }
}

#[derive(Debug, DeserializeRow)]
pub struct KeySpace {
    pub keyspace_name: String,
    pub durable_writes: bool,
    pub replication: std::collections::HashMap<String, String>,
}

#[derive(Debug)]
pub struct Column {
    pub keyspace_name: String,
    pub table_name: String,
    pub column_name: String,
    pub column_type: String,
}

impl fmt::Display for Column {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "Column [keyspace: {}, table: {}, column: {}, type: {}]",
            self.keyspace_name, self.table_name, self.column_name, self.column_type
        )
    }
}

impl FromIterator<KeySpace> for Vec<String> {
    fn from_iter<I: IntoIterator<Item = KeySpace>>(iter: I) -> Self {
        iter.into_iter().map(|item| item.keyspace_name).collect()
    }
}

#[derive(Debug)]
pub struct Role {
    pub name: String,
}

#[derive(Debug)]
pub struct Aggregate {
    pub keyspace_name: String,
    pub aggregate_name: String,
}

#[derive(Debug)]
pub struct Function {
    pub keyspace_name: String,
    pub function_name: String,
}

#[derive(Debug)]
pub struct Index {
    pub keyspace_name: String,
    pub index_name: String,
}

#[derive(Debug)]
pub struct Type {
    pub keyspace_name: String,
    pub type_name: String,
}

#[derive(Debug)]
pub struct View {
    pub keyspace_name: String,
    pub view_name: String,
}

#[derive(Debug, Clone)]
pub enum TlsMode {
    None,
    Tls { ca_cert_path: String },
}

/// Global CQL settings for cqlls
#[derive(Debug)]
pub struct CqlSettings {
    pub url: String,
    pub pswd: String,
    pub user: String,
    pub tls: TlsMode,
}

impl CqlSettings {
    pub fn new() -> Self {
        Self {
            url: String::from("127.0.0.1:9042"),
            pswd: String::from("cassandra"),
            user: String::from("cassandra"),
            tls: TlsMode::None,
        }
    }

    pub fn new_docker() -> Self {
        Self {
            url: String::from("172.17.0.2:9042"),
            pswd: String::from("cassandra"),
            user: String::from("cassandra"),
            tls: TlsMode::None,
        }
    }

    pub fn from_env(url: &str, pswd: &str, user: &str) -> Self {
        Self {
            url: String::from(url),
            pswd: String::from(pswd),
            user: String::from(user),
            tls: TlsMode::None,
        }
    }

    pub fn with_tls(mut self, ca_cert_path: impl Into<String>) -> Self {
        self.tls = TlsMode::Tls {
            ca_cert_path: ca_cert_path.into(),
        };
        self
    }
}

/// Builds client session
/// Builds client session
async fn build_session(config: &CqlSettings) -> Result<Session, Box<dyn std::error::Error>> {
    let mut builder = SessionBuilder::new()
        .known_node(&config.url)
        .user(&config.user, &config.pswd)
        .connection_timeout(Duration::from_secs(3));

    match &config.tls {
        TlsMode::None => {
            info!("Connecting without TLS");
        }
        TlsMode::Tls { ca_cert_path } => {
            if ca_cert_path.is_empty() {
                return Err("TLS enabled but ca_cert_path is empty".into());
            }

            info!("Connecting with TLS, cert path: {}", ca_cert_path);

            let rustls_ca = CertificateDer::from_pem_file(ca_cert_path)
                .map_err(|e| format!("Failed to load CA cert '{}': {}", ca_cert_path, e))?;

            let mut root_store = RootCertStore::empty();
            root_store.add(rustls_ca)?;

            let tls_config = ClientConfig::builder()
                .with_root_certificates(root_store)
                .with_no_client_auth();

            builder = builder.tls_context(Some(Arc::new(tls_config)));
        }
    }

    Ok(builder.build().await?)
}
pub async fn query_keyspaces(
    config: &CqlSettings,
) -> Result<Vec<KeySpace>, Box<dyn std::error::Error>> {
    info!("Start transaction");
    let session = build_session(config).await?;
    let select_statement: Statement = Statement::new("SELECT * FROM system_schema.keyspaces;");
    let statement: PreparedStatement = session.prepare(select_statement).await?;

    let mut rows_stream = session
        .execute_iter(statement, &[])
        .await?
        .rows_stream::<KeySpace>()?;

    let mut items = Vec::<KeySpace>::new();

    while let Some(next_row_res) = rows_stream.next().await {
        let keyspace: KeySpace = next_row_res?;
        info!("Keyspace {:?}", keyspace.keyspace_name);
        items.push(keyspace);
    }

    info!("End transaction");

    Ok(items)
}

pub async fn query_g_fields(
    config: &CqlSettings,
) -> Result<Vec<Column>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let mut items = Vec::<Column>::new();
    let tables = query_g_tables(config).await?;

    for table in tables {
        let query = format!(
            "SELECT column_name, type  FROM system_schema.columns WHERE keyspace_name = '{}' AND table_name = '{}';",
            table.keyspace_name, table.table_name
        );

        let result_rows = session
            .query_unpaged(query, &[])
            .await?
            .into_rows_result()?;

        for row in result_rows.rows::<(String, String)>()? {
            let column = row?;
            info!("Found field: {}", column.0);
            items.push(Column {
                column_name: column.0,
                keyspace_name: table.keyspace_name.clone(),
                table_name: table.table_name.clone(),
                column_type: column.1,
            });
        }
    }

    Ok(items)
}

pub async fn check_connection(config: &CqlSettings) -> Result<bool, Box<dyn std::error::Error>> {
    _ = build_session(config).await?;
    Ok(true)
}

pub async fn query_keyspace_scoped_tables(
    config: &CqlSettings,
    keyspace: &str,
) -> Result<Vec<Table>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!(
        "SELECT keyspace_name, table_name FROM system_schema.tables WHERE keyspace_name = '{keyspace}';"
    );

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Table>::new();

    for row in result_rows.rows::<Table>()? {
        let table = row?;
        items.push(table);
    }
    Ok(items)
}

pub async fn query_g_tables(
    config: &CqlSettings,
) -> Result<Vec<Table>, Box<dyn std::error::Error>> {
    let keyspaces = query_keyspaces(&config).await?;
    let mut items = Vec::<Table>::new();

    for keyspace in keyspaces {
        let mut tables = query_keyspace_scoped_tables(&config, &keyspace.keyspace_name).await?;
        items.append(&mut tables);
    }

    Ok(items)
}

pub async fn query_keyspace_scoped_fields(
    config: &CqlSettings,
    keyspace: &str,
) -> Result<Vec<Column>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let select_tables_query =
        format!("SELECT table_name FROM system_schema.tables WHERE keyspace_name = '{keyspace}';");

    let result_rows = session
        .query_unpaged(select_tables_query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Column>::new();

    for row in result_rows.rows::<(String,)>()? {
        let row_result = row?;
        info!("Table_name: {}", row_result.0);
        let table = row_result.0;

        let select_columns_query = format!(
            "SELECT keyspace_name, table_name, column_name, type FROM system_schema.columns WHERE keyspace_name = '{keyspace}' AND table_name = '{table}'"
        );

        let result_rows = session
            .query_unpaged(select_columns_query, &[])
            .await?
            .into_rows_result()?;

        for jrow in result_rows.rows::<(String, String, String, String)>()? {
            let jrow_result = jrow?;
            let column = Column {
                keyspace_name: jrow_result.0,
                table_name: jrow_result.1,
                column_name: jrow_result.2,
                column_type: jrow_result.3,
            };

            items.push(column);
        }
    }

    Ok(items)
}

pub async fn query_hard_scoped_fields(
    config: &CqlSettings,
    keyspace_name: &str,
    table_name: &str,
) -> Result<Vec<Column>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!(
        "SELECT column_name, type  FROM system_schema.columns WHERE keyspace_name = '{}' AND table_name = '{}';",
        keyspace_name, table_name
    );

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Column>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let column_name = row_result.0;
        let column_type = row_result.1;
        items.push(Column {
            keyspace_name: keyspace_name.to_string(),
            table_name: table_name.to_string(),
            column_name,
            column_type,
        });
    }

    Ok(items)
}

/*
    keyspace_name |
    aggregate_name |
    argument_types |
    final_func |
    initcond |
    return_type |
    state_func |
    state_type
*/
pub async fn query_aggregates(
    config: &CqlSettings,
) -> Result<Vec<Aggregate>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!("SELECT keyspace_name, aggregate_name FROM system_schema.aggregates;");

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Aggregate>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let keyspace_name = row_result.0;
        let aggregate_name = row_result.1;
        items.push(Aggregate {
            keyspace_name,
            aggregate_name,
        });
    }

    Ok(items)
}

/*
    keyspace_name |
    function_name |
    argument_types |
    argument_names |
    body |
    called_on_null_input |
    language |
    return_type
*/
pub async fn query_functions(
    config: &CqlSettings,
) -> Result<Vec<Function>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!("SELECT keyspace_name, function_name FROM system_schema.functions;");

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Function>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let keyspace_name = row_result.0;
        let function_name = row_result.1;
        items.push(Function {
            keyspace_name,
            function_name,
        });
    }

    Ok(items)
}

/*
    keyspace_name |
    table_name |
    index_name |
    kind |
    options
*/
pub async fn query_indexes(config: &CqlSettings) -> Result<Vec<Index>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!("SELECT keyspace_name, index_name FROM system_schema.indexes;");

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Index>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let keyspace_name = row_result.0;
        let index_name = row_result.1;
        items.push(Index {
            keyspace_name,
            index_name,
        });
    }

    Ok(items)
}

/*
    keyspace_name |
    type_name   |
    field_names |
    field_type
*/
pub async fn query_types(config: &CqlSettings) -> Result<Vec<Type>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;
    let query = format!("SELECT keyspace_name, type_name FROM system_schema.types;");

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<Type>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let keyspace_name = row_result.0;
        let type_name = row_result.1;
        items.push(Type {
            keyspace_name,
            type_name,
        });
    }

    Ok(items)
}

/*
    keyspace_name |
    view_name |
    base_table_id |
    base_table_name |
    bloom_filter_fp_chance |
    caching |
    comment |
    compaction |
    compression |
    crc_check_chance |
    dclocal_read_repair_chance |
    default_time_to_live |
    extensions | gc_grace_seconds |
    id | include_all_columns |
    max_index_interval |
    memtable_flush_period_in_ms |
    min_index_interval |
    read_repair_chance |
    speculative_retry |
    where_clause
*/
pub async fn query_views(config: &CqlSettings) -> Result<Vec<View>, Box<dyn std::error::Error>> {
    let session = build_session(config).await?;

    let query = format!("SELECT keyspace_name, view_name FROM system_schema.views;");

    let result_rows = session
        .query_unpaged(query, &[])
        .await?
        .into_rows_result()?;

    let mut items = Vec::<View>::new();

    for row in result_rows.rows::<(String, String)>()? {
        let row_result = row?;
        let keyspace_name = row_result.0;
        let view_name = row_result.1;
        items.push(View {
            keyspace_name,
            view_name,
        });
    }

    Ok(items)
}