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use r2d2;
use std::cell::RefCell;
use cluster::{GetCompressor, GetConnection};
use error;
use frame::parser::from_connection;
use frame::{Flag, Frame, IntoBytes};
use transport::CDRSTransport;
use types::CBytesShort;
pub type PreparedQuery = CBytesShort;
pub trait PrepareExecutor<
T: CDRSTransport + 'static,
M: r2d2::ManageConnection<Connection = RefCell<T>, Error = error::Error> + Sized,
>: GetConnection<T, M> + GetCompressor<'static>
{
fn prepare_tw<Q: ToString>(
&self,
query: Q,
with_tracing: bool,
with_warnings: bool,
) -> error::Result<PreparedQuery> {
let mut flags = vec![];
if with_tracing {
flags.push(Flag::Tracing);
}
if with_warnings {
flags.push(Flag::Warning);
}
let query_frame = Frame::new_req_prepare(query.to_string(), flags).into_cbytes();
let ref compression = self.get_compressor();
self
.get_connection()
.ok_or(error::Error::from("Unable to get transport"))
.and_then(|transport_cell| {
let write_res = transport_cell
.borrow_mut()
.write(query_frame.as_slice())
.map_err(error::Error::from);
write_res.map(|_| transport_cell)
})
.and_then(|transport_cell| from_connection(&transport_cell, compression))
.and_then(|response| response.get_body())
.and_then(|body| {
Ok(
body
.into_prepared()
.expect("CDRS BUG: cannot convert frame into prepared")
.id,
)
})
}
fn prepare<Q: ToString>(&self, query: Q) -> error::Result<PreparedQuery> {
self.prepare_tw(query, false, false)
}
}