cdrs 2.2.0

Cassandra DB driver written in Rust
Documentation 
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use std::cell::RefCell;

use crate::cluster::{GetCompressor, GetConnection};
use crate::error;
use crate::frame::parser::from_connection;
use crate::frame::{Flag, Frame};
use crate::transport::CDRSTransport;

pub fn prepare_flags(with_tracing: bool, with_warnings: bool) -> Vec<Flag> {
  let mut flags = vec![];

  if with_tracing {
    flags.push(Flag::Tracing);
  }

  if with_warnings {
    flags.push(Flag::Warning);
  }

  flags
}

pub fn send_frame<S, T, M>(sender: &S, frame_bytes: Vec<u8>) -> error::Result<Frame>
where
  S: GetConnection<T, M> + GetCompressor<'static> + Sized,
  T: CDRSTransport + 'static,
  M: r2d2::ManageConnection<Connection = RefCell<T>, Error = error::Error> + Sized,
{
  let ref compression = sender.get_compressor();

  sender
    .get_connection()
    .ok_or(error::Error::from("Unable to get transport"))
    .and_then(|transport_cell| {
      let write_res = transport_cell
        .borrow_mut()
        .write(frame_bytes.as_slice())
        .map_err(error::Error::from);
      write_res.map(|_| transport_cell)
    })
    .and_then(|transport_cell| from_connection(&transport_cell, compression))
}

#[cfg(test)]
mod test {
  use super::*;

  #[test]
  fn prepare_flags_test() {
    assert_eq!(prepare_flags(true, false), vec![Flag::Tracing]);
    assert_eq!(prepare_flags(false, true), vec![Flag::Warning]);
    assert_eq!(
      prepare_flags(true, true),
      vec![Flag::Tracing, Flag::Warning]
    );
  }
}