amq-protocol 6.0.0-rc1

AMQP specifications
Documentation 
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/// Traits required for parsing
pub use crate::types::parsing::traits;
use crate::{
    frame::*,
    protocol::{basic::parse_properties, *},
    types::parsing::*,
};
use nom::{
    branch::alt,
    bytes::streaming::{tag, take},
    combinator::{all_consuming, flat_map, map, map_opt, map_res},
    error::context,
    sequence::{pair, tuple},
};
use traits::ParsableInput;

/// Parse a channel id
pub fn parse_channel<I: ParsableInput>(i: I) -> ParserResult<I, AMQPChannel> {
    context("parse_channel", map(parse_id, From::from))(i)
}

/// Parse the protocol header
pub fn parse_protocol_header<I: ParsableInput>(i: I) -> ParserResult<I, ProtocolVersion> {
    context(
        "parse_protocol_header",
        map(
            tuple((
                tag(metadata::NAME.as_bytes()),
                tag(&[0][..]),
                parse_short_short_uint,
                parse_short_short_uint,
                parse_short_short_uint,
            )),
            |(_, _, major, minor, revision)| ProtocolVersion {
                major,
                minor,
                revision,
            },
        ),
    )(i)
}

/// Parse the frame type
pub fn parse_frame_type<I: ParsableInput>(i: I) -> ParserResult<I, AMQPFrameType> {
    context(
        "parse_frame_type",
        map_opt(parse_short_short_uint, |method| match method {
            constants::FRAME_METHOD => Some(AMQPFrameType::Method),
            constants::FRAME_HEADER => Some(AMQPFrameType::Header),
            constants::FRAME_BODY => Some(AMQPFrameType::Body),
            constants::FRAME_HEARTBEAT => Some(AMQPFrameType::Heartbeat),
            _ => None,
        }),
    )(i)
}

/// Parse a full AMQP Frame (with contents)
pub fn parse_frame<I: ParsableInput>(i: I) -> ParserResult<I, AMQPFrame> {
    context(
        "parse_frame",
        alt((
            map_res(
                parse_raw_frame,
                |AMQPRawFrame {
                     channel_id,
                     frame_type,
                     payload,
                 }: AMQPRawFrame<I>| match frame_type {
                    AMQPFrameType::Method => all_consuming(parse_class)(payload)
                        .map(|(_, m)| AMQPFrame::Method(channel_id, m)),
                    AMQPFrameType::Header => all_consuming(parse_content_header)(payload)
                        .map(|(_, h)| AMQPFrame::Header(channel_id, h.class_id, Box::new(h))),
                    AMQPFrameType::Body => Ok(AMQPFrame::Body(
                        channel_id,
                        payload.iter_elements().collect(),
                    )),
                    AMQPFrameType::Heartbeat => Ok(AMQPFrame::Heartbeat(channel_id)),
                },
            ),
            map(parse_protocol_header, AMQPFrame::ProtocolHeader),
        )),
    )(i)
}

/// Parse a raw AMQP frame
pub fn parse_raw_frame<I: ParsableInput>(i: I) -> ParserResult<I, AMQPRawFrame<I>> {
    context(
        "parse_raw_frame",
        flat_map(
            tuple((parse_frame_type, parse_id, parse_long_uint)),
            move |(frame_type, channel_id, size)| {
                map(
                    pair(take(size), tag(&[constants::FRAME_END][..])),
                    move |(payload, _)| AMQPRawFrame {
                        frame_type,
                        channel_id,
                        payload,
                    },
                )
            },
        ),
    )(i)
}

/// Parse a content header frame
pub fn parse_content_header<I: ParsableInput>(i: I) -> ParserResult<I, AMQPContentHeader> {
    context(
        "parse_content_header",
        map(
            tuple((
                parse_id,
                parse_short_uint,
                parse_long_long_uint,
                context("parse_properties", parse_properties),
            )),
            |(class_id, weight, body_size, properties)| AMQPContentHeader {
                class_id,
                weight,
                body_size,
                properties,
            },
        ),
    )(i)
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_protocol_header() {
        assert_eq!(parse_frame(&['A' as u8, 'M' as u8, 'Q' as u8, 'P' as u8, 0, 0, 9, 1][..]), Ok((&[][..], AMQPFrame::ProtocolHeader(ProtocolVersion::amqp_0_9_1()))));
    }

    #[test]
    fn test_heartbeat() {
        assert_eq!(parse_frame(&[8, 0, 1, 0, 0, 0, 0, 206][..]), Ok((&[][..], AMQPFrame::Heartbeat(1))));
    }
}