wtx 0.28.0

A collection of different transport implementations and related tools focused primarily on web technologies.
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use crate::{
  database::client::rdbms::{
    statement::StatementMut, statement_builder::StatementBuilder, statements_misc::StatementsMisc,
  },
  misc::{_random_state, BlocksDeque, FnMutFut, Rng},
};
use foldhash::fast::FixedState;
use hashbrown::HashMap;

/// Statements
#[derive(Debug)]
pub(crate) struct Statements<A, C, T> {
  max_stmts: usize,
  rs: FixedState,
  stmts: BlocksDeque<(C, T), StatementsMisc<A>>,
  stmts_indcs: HashMap<u64, usize>,
}

impl<A, C, T> Statements<A, C, T> {
  #[inline]
  pub(crate) fn new<RNG>(max_stmts: usize, rng: RNG) -> Self
  where
    RNG: Rng,
  {
    Self {
      max_stmts: max_stmts.max(1),
      rs: _random_state(rng),
      stmts: BlocksDeque::new(),
      stmts_indcs: HashMap::new(),
    }
  }

  #[inline]
  pub(crate) fn with_capacity<RNG>(
    columns: usize,
    max_stmts: usize,
    rng: RNG,
    stmts: usize,
  ) -> crate::Result<Self>
  where
    RNG: Rng,
  {
    Ok(Self {
      max_stmts: max_stmts.max(1),
      rs: _random_state(rng),
      stmts: BlocksDeque::with_capacity(stmts, columns)?,
      stmts_indcs: HashMap::with_capacity(stmts),
    })
  }

  #[inline]
  pub(crate) async fn builder<AUX>(
    &mut self,
    mut aux: AUX,
    mut stmt_cb: impl for<'any> FnMutFut<(&'any mut AUX, StatementsMisc<A>), Result = crate::Result<()>>,
  ) -> crate::Result<StatementBuilder<'_, A, C, T>> {
    if self.stmts.blocks_len() >= self.max_stmts {
      let to_remove = (self.max_stmts / 2).max(1);
      for _ in 0..to_remove {
        if let Some(stmt) = self.stmts.pop_front() {
          stmt_cb.call((&mut aux, stmt)).await?;
        }
      }
      self.stmts_indcs.retain(|_, value| {
        if *value < to_remove {
          return false;
        }
        *value = value.wrapping_sub(to_remove);
        true
      })
    }
    Ok(StatementBuilder::new(&mut self.stmts, &mut self.stmts_indcs))
  }

  #[inline]
  pub(crate) fn clear(&mut self) {
    let Self { max_stmts: _, rs: _, stmts, stmts_indcs } = self;
    stmts.clear();
    stmts_indcs.clear();
  }

  #[inline]
  pub(crate) fn get_by_idx(&mut self, idx: usize) -> Option<StatementMut<'_, A, C, T>>
  where
    A: Clone,
  {
    let stmt = self.stmts.get_mut(idx)?;
    Some(StatementMut::new(
      stmt.misc._aux.clone(),
      &mut stmt.misc.columns_len,
      &mut stmt.misc.types_len,
      stmt.data,
    ))
  }

  #[inline]
  pub(crate) fn get_by_stmt_cmd_id(&mut self, stmt_cmd_id: u64) -> Option<StatementMut<'_, A, C, T>>
  where
    A: Clone,
  {
    self.get_by_idx(*self.stmts_indcs.get(&stmt_cmd_id)?)
  }

  #[inline]
  pub(crate) fn hasher_mut(&mut self) -> &mut FixedState {
    &mut self.rs
  }
}

#[cfg(all(feature = "_async-tests", test))]
mod tests {
  use crate::{
    database::client::rdbms::{
      statement::Statement,
      statements::Statements,
      statements_misc::StatementsMisc,
      tests::{_column0, _column1, _column2, _column3},
    },
    misc::{Xorshift64, simple_seed},
  };

  // FIXME(MIRI): The modification of the vector's length makes MIRI think that there is an
  // invalid pointer using stacked borrows.
  //
  // | A | B |   | <- Push back one block of 2 elements. Length is 2
  // | A | B | C | <- Push back one block of 1 element. Length is 3
  // |   |   | C | <- Pop front one block. Length is 1
  //
  // Such behaviour does not occur with "miri-tree-borrows".
  #[cfg_attr(miri, ignore)]
  #[tokio::test]
  async fn two_statements() {
    let mut stmts = Statements::new(2, &mut Xorshift64::from(simple_seed()));

    let stmt_id0 = 123;
    let mut builder = stmts.builder((), builder_fn).await.unwrap();
    let _ = builder.expand(2, ("", 0)).unwrap();
    builder.inserted_elements()[0] = (_column0(), 100);
    builder.inserted_elements()[1] = (_column1(), 100);
    let _ = builder.build(stmt_id0, StatementsMisc::new(10, 2, 1)).unwrap();
    {
      let stmt: Statement<'_, _, _, _> = stmts.get_by_stmt_cmd_id(stmt_id0).unwrap().into();
      assert_eq!(stmt._columns().count(), 2);
      assert_eq!(stmt._column(0).unwrap(), &_column0());
      assert_eq!(stmt._column(1).unwrap(), &_column1());
      assert_eq!(stmt._tys().count(), 1);
      assert_eq!(stmt._ty(0).unwrap(), &100);
    }

    let stmt_id1 = 456;
    let mut builder = stmts.builder((), builder_fn).await.unwrap();
    let _ = builder.expand(1, ("", 0)).unwrap();
    builder.inserted_elements()[0] = (_column2(), 200);
    let _ = builder.build(stmt_id1, StatementsMisc::new(11, 1, 1)).unwrap();
    {
      let stmt: Statement<'_, _, _, _> = stmts.get_by_stmt_cmd_id(stmt_id0).unwrap().into();
      assert_eq!(stmt._columns().count(), 2);
      assert_eq!(stmt._column(0).unwrap(), &_column0());
      assert_eq!(stmt._column(1).unwrap(), &_column1());
      assert_eq!(stmt._tys().count(), 1);
      assert_eq!(stmt._ty(0).unwrap(), &100);
    }
    {
      let stmt: Statement<'_, _, _, _> = stmts.get_by_stmt_cmd_id(stmt_id1).unwrap().into();
      assert_eq!(stmt._columns().count(), 1);
      assert_eq!(stmt._column(0).unwrap(), &_column2());
      assert_eq!(stmt._tys().count(), 1);
      assert_eq!(stmt._ty(0).unwrap(), &200);
    }

    let stmt_id2 = 789;
    let mut builder = stmts.builder((), builder_fn).await.unwrap();
    let _ = builder.expand(1, ("", 0)).unwrap();
    builder.inserted_elements()[0].0 = _column3();
    let _ = builder.build(stmt_id2, StatementsMisc::new(12, 1, 0)).unwrap();
    assert_eq!(stmts.get_by_stmt_cmd_id(stmt_id0), None);
    {
      let stmt: Statement<'_, _, _, _> = stmts.get_by_stmt_cmd_id(stmt_id1).unwrap().into();
      assert_eq!(stmt._columns().count(), 1);
      assert_eq!(stmt._column(0).unwrap(), &_column2());
      assert_eq!(stmt._tys().count(), 1);
      assert_eq!(stmt._ty(0).unwrap(), &200);
    }
    {
      let stmt: Statement<'_, _, _, _> = stmts.get_by_stmt_cmd_id(stmt_id2).unwrap().into();
      assert_eq!(stmt._columns().count(), 1);
      assert_eq!(stmt._column(0).unwrap(), &_column3());
      assert_eq!(stmt._tys().count(), 0);
    }

    stmts.clear();
    assert_eq!(stmts.get_by_stmt_cmd_id(stmt_id0), None);
    assert_eq!(stmts.get_by_stmt_cmd_id(stmt_id1), None);
    assert_eq!(stmts.get_by_stmt_cmd_id(stmt_id2), None);
  }

  pub(crate) async fn builder_fn(_: &mut (), _: StatementsMisc<i32>) -> crate::Result<()> {
    Ok(())
  }
}