cdrs 2.2.0

Cassandra DB driver written in Rust
Documentation 
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#![warn(missing_docs)]
//! Contains Query Frame related functionality.
use rand;

use crate::consistency::Consistency;
use crate::frame::*;
use crate::query::{Query, QueryFlags, QueryParams, QueryValues};
use crate::types::*;

/// Structure which represents body of Query request
#[derive(Debug)]
pub struct BodyReqQuery {
  /// Query string.
  pub query: CStringLong,
  /// Query parameters.
  pub query_params: QueryParams,
}

impl BodyReqQuery {
  // Fabric function that produces Query request body.
  fn new(
    query: String,
    consistency: Consistency,
    values: Option<QueryValues>,
    with_names: Option<bool>,
    page_size: Option<i32>,
    paging_state: Option<CBytes>,
    serial_consistency: Option<Consistency>,
    timestamp: Option<i64>,
  ) -> BodyReqQuery {
    // query flags
    let mut flags: Vec<QueryFlags> = vec![];
    if values.is_some() {
      flags.push(QueryFlags::Value);
    }
    if with_names.unwrap_or(false) {
      flags.push(QueryFlags::WithNamesForValues);
    }
    if page_size.is_some() {
      flags.push(QueryFlags::PageSize);
    }
    if paging_state.is_some() {
      flags.push(QueryFlags::WithPagingState);
    }
    if serial_consistency.is_some() {
      flags.push(QueryFlags::WithSerialConsistency);
    }
    if timestamp.is_some() {
      flags.push(QueryFlags::WithDefaultTimestamp);
    }

    BodyReqQuery {
      query: CStringLong::new(query),
      query_params: QueryParams {
        consistency,
        flags,
        with_names,
        values,
        page_size,
        paging_state,
        serial_consistency,
        timestamp,
      },
    }
  }
}

impl IntoBytes for BodyReqQuery {
  fn into_cbytes(&self) -> Vec<u8> {
    let mut v: Vec<u8> = vec![];
    v.extend_from_slice(self.query.clone().into_cbytes().as_slice());
    v.extend_from_slice(self.query_params.into_cbytes().as_slice());
    v
  }
}

// Frame implementation related to BodyReqStartup

impl Frame {
  /// **Note:** This function should be used internally for building query request frames.
  pub fn new_req_query(
    query: String,
    consistency: Consistency,
    values: Option<QueryValues>,
    with_names: Option<bool>,
    page_size: Option<i32>,
    paging_state: Option<CBytes>,
    serial_consistency: Option<Consistency>,
    timestamp: Option<i64>,
    flags: Vec<Flag>,
  ) -> Frame {
    let version = Version::Request;
    let stream = rand::random::<u16>();
    let opcode = Opcode::Query;
    let body = BodyReqQuery::new(
      query,
      consistency,
      values,
      with_names,
      page_size,
      paging_state,
      serial_consistency,
      timestamp,
    );

    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![],
    }
  }

  /// **Note:** This function should be used internally for building query request frames.
  pub fn new_query(query: Query, flags: Vec<Flag>) -> Frame {
    Frame::new_req_query(
      query.query,
      query.params.consistency,
      query.params.values,
      query.params.with_names,
      query.params.page_size,
      query.params.paging_state,
      query.params.serial_consistency,
      query.params.timestamp,
      flags,
    )
  }
}