trust-dns 0.11.0

TRust-DNS is a safe and secure DNS library. This is the Client library with DNSec support. DNSSec with NSEC validation for negative records, is complete. The client supports dynamic DNS with SIG0 authenticated requests, implementing easy to use high level funtions. TRust-DNS is based on the Tokio and Futures libraries, which means it should be easily integrated into other software that also use those libraries.
Documentation 
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/*
 * Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//! Operation code for queries, updates, and responses

use std::convert::From;

use ::error::*;

/// Operation code for queries, updates, and responses
///
/// [RFC 1035, DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION, November 1987](https://tools.ietf.org/html/rfc1035)
///
/// ```text
/// OPCODE          A four bit field that specifies kind of query in this
///                 message.  This value is set by the originator of a query
///                 and copied into the response.  The values are:
///
///                 0               a standard query (QUERY)
///
///                 1               an inverse query (IQUERY)
///
///                 2               a server status request (STATUS)
///
///                 3-15            reserved for future use
/// ```
#[derive(Debug, PartialEq, PartialOrd, Copy, Clone)]
#[allow(dead_code)]
pub enum OpCode {
    /// Query request [RFC 1035](https://tools.ietf.org/html/rfc1035)
    Query,

    /// Status message [RFC 1035](https://tools.ietf.org/html/rfc1035)
    Status,

    /// Notify of change [RFC 1996](https://tools.ietf.org/html/rfc1996)
    Notify,

    /// Update message [RFC 2136](https://tools.ietf.org/html/rfc2136)
    Update,
}

/// Convert from OpCode to u8
///
/// ```
/// use std::convert::From;
/// use trust_dns::op::op_code::OpCode;
///
/// let var: u8 = From::from(OpCode::Query);
/// assert_eq!(0, var);
///
/// let var: u8 = OpCode::Query.into();
/// assert_eq!(0, var);
/// ```
impl From<OpCode> for u8 {
    fn from(rt: OpCode) -> Self {
        match rt {
            OpCode::Query => 0,
            // 1	IQuery (Inverse Query, OBSOLETE)	[RFC3425]
            OpCode::Status => 2,
            // 3	Unassigned
            OpCode::Notify => 4,
            OpCode::Update => 5,
            // 6-15	Unassigned
        }
    }
}

/// Convert from u8 to OpCode
///
/// ```
/// use std::convert::From;
/// use trust_dns::op::op_code::OpCode;
///
/// let var: OpCode = OpCode::from_u8(0).unwrap();
/// assert_eq!(OpCode::Query, var);
/// ```
impl OpCode {
    /// Decodes the binary value of the OpCode
    pub fn from_u8(value: u8) -> DecodeResult<Self> {
        match value {
            0 => Ok(OpCode::Query),
            2 => Ok(OpCode::Status),
            4 => Ok(OpCode::Notify),
            5 => Ok(OpCode::Update),
            _ => Err(DecodeErrorKind::Msg(format!("unknown OpCode: {}", value)).into()),
        }
    }
}