kafka 0.3.2

Rust client for Apache Kafka
Documentation 
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use std::io::{Read, Write};

use codecs::{ToByte, FromByte};
use error::{Error, Result};
use utils::PartitionOffset;
use super::{HeaderRequest, HeaderResponse};
use super::{API_KEY_OFFSET, API_VERSION};


#[derive(Debug)]
pub struct OffsetRequest<'a> {
    pub header: HeaderRequest<'a>,
    pub replica: i32,
    pub topic_partitions: Vec<TopicPartitionOffsetRequest<'a>>
}

#[derive(Default, Debug)]
pub struct TopicPartitionOffsetRequest<'a> {
    pub topic: &'a str,
    pub partitions: Vec<PartitionOffsetRequest>
}

#[derive(Default, Debug)]
pub struct PartitionOffsetRequest {
    pub partition: i32,
    pub max_offsets: i32,
    pub time: i64,
}

impl<'a> OffsetRequest<'a> {
    pub fn new(correlation_id: i32, client_id: &'a str) -> OffsetRequest<'a> {
        OffsetRequest {
            header: HeaderRequest::new(
                API_KEY_OFFSET, API_VERSION, correlation_id, client_id),
            replica: -1,
            topic_partitions: vec!()
        }
    }

    pub fn add(&mut self, topic: &'a str, partition: i32, time: i64) {
        for tp in &mut self.topic_partitions {
            if tp.topic == topic {
                tp.add(partition, time);
                return;
            }
        }
        let mut tp = TopicPartitionOffsetRequest::new(topic);
        tp.add(partition, time);
        self.topic_partitions.push(tp);
    }
}

impl<'a> TopicPartitionOffsetRequest<'a> {
    pub fn new(topic: &'a str) -> TopicPartitionOffsetRequest<'a> {
        TopicPartitionOffsetRequest {
            topic: topic,
            partitions: vec!()
        }
    }

    pub fn add(&mut self, partition: i32, time: i64) {
        self.partitions.push(PartitionOffsetRequest::new(partition, time));
    }
}

impl PartitionOffsetRequest {
    pub fn new(partition: i32, time: i64) -> PartitionOffsetRequest {
        PartitionOffsetRequest{
            partition: partition,
            max_offsets: 1,
            time: time,
        }
    }
}

impl<'a> ToByte for OffsetRequest<'a> {
    fn encode<T:Write>(&self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.header.encode(buffer),
            self.replica.encode(buffer),
            self.topic_partitions.encode(buffer)
        )
    }
}

impl<'a> ToByte for TopicPartitionOffsetRequest<'a> {
    fn encode<T: Write>(&self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.topic.encode(buffer),
            self.partitions.encode(buffer)
        )
    }
}

impl ToByte for PartitionOffsetRequest {
    fn encode<T: Write>(&self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.partition.encode(buffer),
            self.time.encode(buffer),
            self.max_offsets.encode(buffer)
        )
    }
}

// --------------------------------------------------------------------

#[derive(Default, Debug)]
pub struct OffsetResponse {
    pub header: HeaderResponse,
    pub topic_partitions: Vec<TopicPartitionOffsetResponse>,
}

#[derive(Default, Debug)]
pub struct TopicPartitionOffsetResponse {
    pub topic: String,
    pub partitions: Vec<PartitionOffsetResponse>,
}

#[derive(Default, Debug)]
pub struct PartitionOffsetResponse {
    pub partition: i32,
    pub error: i16,
    pub offset: Vec<i64>
}

impl PartitionOffsetResponse {
    pub fn into_offset(self) -> PartitionOffset {
        PartitionOffset {
            partition: self.partition,
            offset: match Error::from_protocol_error(self.error) {
                None => Ok(match self.offset.first() {
                    Some(offs) => *offs,
                    None => -1,
                }),
                Some(e) => Err(e),
            }
        }
    }
}

impl FromByte for OffsetResponse {
    type R = OffsetResponse;

    #[allow(unused_must_use)]
    fn decode<T: Read>(&mut self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.header.decode(buffer),
            self.topic_partitions.decode(buffer)
        )
    }
}

impl FromByte for TopicPartitionOffsetResponse {
    type R = TopicPartitionOffsetResponse;

    #[allow(unused_must_use)]
    fn decode<T: Read>(&mut self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.topic.decode(buffer),
            self.partitions.decode(buffer)
        )
    }
}

impl FromByte for PartitionOffsetResponse {
    type R = PartitionOffsetResponse;

    #[allow(unused_must_use)]
    fn decode<T: Read>(&mut self, buffer: &mut T) -> Result<()> {
        try_multi!(
            self.partition.decode(buffer),
            self.error.decode(buffer),
            self.offset.decode(buffer)
        )
    }
}