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use r2d2;
use std::cell::RefCell;
use std::io::{Cursor, Read};
use std::ops::Deref;
use super::*;
use crate::compression::Compression;
use crate::error;
use crate::frame::frame_response::ResponseBody;
use crate::frame::FromCursor;
use crate::transport::CDRSTransport;
use crate::types::data_serialization_types::decode_timeuuid;
use crate::types::{from_bytes, from_u16_bytes, CStringList, UUID_LEN};
pub fn from_connection<M, T>(
conn: &r2d2::PooledConnection<M>,
compressor: &Compression,
) -> error::Result<Frame>
where
T: CDRSTransport + 'static,
M: r2d2::ManageConnection<Connection = RefCell<T>, Error = error::Error> + Sized,
{
parse_frame(conn.deref(), compressor)
}
pub fn parse_frame(cursor_cell: &RefCell<dyn Read>, compressor: &Compression) -> error::Result<Frame> {
let mut version_bytes = [0; Version::BYTE_LENGTH];
let mut flag_bytes = [0; Flag::BYTE_LENGTH];
let mut opcode_bytes = [0; Opcode::BYTE_LENGTH];
let mut stream_bytes = [0; STREAM_LEN];
let mut length_bytes = [0; LENGTH_LEN];
let mut cursor = cursor_cell.borrow_mut();
cursor.read_exact(&mut version_bytes)?;
cursor.read_exact(&mut flag_bytes)?;
cursor.read_exact(&mut stream_bytes)?;
cursor.read_exact(&mut opcode_bytes)?;
cursor.read_exact(&mut length_bytes)?;
let version = Version::from(version_bytes.to_vec());
let flags = Flag::get_collection(flag_bytes[0]);
let stream = from_u16_bytes(&stream_bytes);
let opcode = Opcode::from(opcode_bytes[0]);
let length = from_bytes(&length_bytes) as usize;
let mut body_bytes = Vec::with_capacity(length);
unsafe {
body_bytes.set_len(length);
}
cursor.read_exact(&mut body_bytes)?;
let full_body = if flags.iter().any(|flag| flag == &Flag::Compression) {
compressor.decode(body_bytes)?
} else {
Compression::None.decode(body_bytes)?
};
let mut body_cursor = Cursor::new(full_body.as_slice());
let tracing_id = if flags.iter().any(|flag| flag == &Flag::Tracing) {
let mut tracing_bytes = Vec::with_capacity(UUID_LEN);
unsafe {
tracing_bytes.set_len(UUID_LEN);
}
body_cursor.read_exact(&mut tracing_bytes)?;
decode_timeuuid(tracing_bytes.as_slice()).ok()
} else {
None
};
let warnings = if flags.iter().any(|flag| flag == &Flag::Warning) {
CStringList::from_cursor(&mut body_cursor)?.into_plain()
} else {
vec![]
};
let mut body = vec![];
body_cursor.read_to_end(&mut body)?;
let frame = Frame {
version: version,
flags: flags,
opcode: opcode,
stream: stream,
body: body,
tracing_id: tracing_id,
warnings: warnings,
};
convert_frame_into_result(frame)
}
fn convert_frame_into_result(frame: Frame) -> error::Result<Frame> {
match frame.opcode {
Opcode::Error => frame.get_body().and_then(|err| match err {
ResponseBody::Error(err) => Err(error::Error::Server(err)),
_ => unreachable!(),
}),
_ => Ok(frame),
}
}