cdrs 2.2.0

Cassandra DB driver written in Rust
Documentation 
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use rand;

use crate::frame::*;
use crate::query::QueryParams;
use crate::types::*;

/// The structure that represents a body of a frame of type `execute`.
#[derive(Debug)]
pub struct BodyReqExecute<'a> {
  /// Id of prepared query
  id: &'a CBytesShort,
  /// Query paramaters which have the same meaning as one for `query`
  /// TODO: clarify if it is QueryParams or its shortened variant
  query_parameters: QueryParams,
}

impl<'a> BodyReqExecute<'a> {
  /// The method which creates new instance of `BodyReqExecute`
  pub fn new(id: &CBytesShort, query_parameters: QueryParams) -> BodyReqExecute {
    BodyReqExecute {
      id: id,
      query_parameters: query_parameters,
    }
  }
}

impl<'a> IntoBytes for BodyReqExecute<'a> {
  fn into_cbytes(&self) -> Vec<u8> {
    let mut v: Vec<u8> = vec![];
    v.extend_from_slice(self.id.into_cbytes().as_slice());
    v.extend_from_slice(self.query_parameters.into_cbytes().as_slice());
    v
  }
}

impl Frame {
  /// **Note:** This function should be used internally for building query request frames.
  pub fn new_req_execute(
    id: &CBytesShort,
    query_parameters: QueryParams,
    flags: Vec<Flag>,
  ) -> Frame {
    let version = Version::Request;
    let stream = rand::random::<u16>();
    let opcode = Opcode::Execute;
    debug!(
      "prepared statement id{:?} getting executed with parameters {:?}",
      id, query_parameters
    );
    let body = BodyReqExecute::new(id, query_parameters);

    Frame {
      version: version,
      flags: flags,
      stream: stream,
      opcode: opcode,
      body: body.into_cbytes(),
      // for request frames it's always None
      tracing_id: None,
      warnings: vec![],
    }
  }
}