kafkang 0.3.0

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

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

#[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,
            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,
            max_offsets: 1,
            time,
        }
    }
}

impl ToByte for OffsetRequest<'_> {
    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 ToByte for TopicPartitionOffsetRequest<'_> {
    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 to_offset(&self) -> std::result::Result<PartitionOffset, KafkaCode> {
        if let Some(code) = KafkaCode::from_protocol(self.error) {
            Err(code)
        } else {
            let offset = self.offset.first().copied().unwrap_or(-1);

            Ok(PartitionOffset {
                partition: self.partition,
                offset,
            })
        }
    }
}

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)
        )
    }
}