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use std::io::Error;
use std::mem::size_of;
use std::fmt::Debug;
use log::trace;
use crc32c;
use kf_protocol::bytes::Buf;
use kf_protocol::bytes::BufMut;
use kf_protocol::Decoder;
use kf_protocol::Encoder;
use kf_protocol::Version;
use kf_protocol_derive::Decode;
use crate::Offset;
use crate::Size;
use super::DefaultRecord;
pub type DefaultBatchRecords = Vec<DefaultRecord>;
pub type DefaultBatch = Batch<DefaultBatchRecords>;
pub trait BatchRecords: Default + Debug + Encoder + Decoder {
fn remainder_bytes(&self,remainder: usize ) -> usize {
remainder
}
}
impl BatchRecords for DefaultBatchRecords {}
pub const BATCH_PREAMBLE_SIZE: usize =
size_of::<Offset>()
+ size_of::<i32>();
#[derive(Default,Debug)]
pub struct Batch<R> where R: BatchRecords {
pub base_offset: Offset,
pub batch_len: i32,
pub header: BatchHeader,
pub records: R
}
impl <R>Batch<R> where R: BatchRecords {
pub fn get_mut_header(&mut self) -> &mut BatchHeader {
&mut self.header
}
pub fn get_header(&self) -> &BatchHeader {
&self.header
}
pub fn get_base_offset(&self) -> Offset {
self.base_offset
}
pub fn set_base_offset(&mut self,offset: Offset) {
self.base_offset = offset;
}
pub fn base_offset(mut self, offset: Offset) -> Self {
self.base_offset = offset;
self
}
pub fn set_offset_delta(&mut self,delta: i32) {
self.header.last_offset_delta = delta;
}
pub fn get_last_offset(&self) -> Offset {
self.get_base_offset() + self.get_last_offset_delta() as Offset
}
pub fn get_last_offset_delta(&self) -> Size {
self.get_header().last_offset_delta as Size
}
pub fn decode_from_file_buf<T>(&mut self, src: &mut T,version: Version) -> Result<(), Error> where T: Buf,
{
trace!("decoding premable");
self.base_offset.decode(src,version)?;
self.batch_len.decode(src,version)?;
self.header.decode(src,version)?;
Ok(())
}
}
impl Batch<DefaultBatchRecords> {
pub fn add_record(&mut self,mut record: DefaultRecord) {
let last_offset_delta = if self.records.len() == 0 { 0 } else { self.records.len() as Offset };
record.preamble.set_offset_delta(last_offset_delta);
self.header.last_offset_delta = last_offset_delta as i32;
self.records.push(record)
}
}
impl <R>Decoder for Batch<R> where R: BatchRecords {
fn decode<T>(&mut self, src: &mut T,version: Version) -> Result<(), Error> where T: Buf,
{
trace!("decoding batch");
self.decode_from_file_buf(src,version)?;
self.records.decode(src,version)?;
Ok(())
}
}
impl <R>Encoder for Batch<R> where R: BatchRecords {
fn write_size(&self,version: Version) -> usize {
BATCH_PREAMBLE_SIZE + BATCH_HEADER_SIZE + self.records.write_size(version)
}
fn encode<T>(&self, dest: &mut T,version: Version) -> Result<(), Error> where T: BufMut
{
trace!("Encoding Batch");
self.base_offset.encode(dest,version)?;
let batch_len: i32 = (BATCH_HEADER_SIZE + self.records.write_size(version)) as i32;
batch_len.encode(dest,version)?;
self.header.partition_leader_epoch.encode(dest,version)?;
self.header.magic.encode(dest,version)?;
let mut out: Vec<u8> = Vec::new();
let buf = &mut out;
self.header.attributes.encode(buf,version)?;
self.header.last_offset_delta.encode(buf,version)?;
self.header.first_timestamp.encode(buf,version)?;
self.header.max_time_stamp.encode(buf,version)?;
self.header.producer_id.encode(buf,version)?;
self.header.producer_epoch.encode(buf,version)?;
self.header.first_sequence.encode(buf,version)?;
self.records.encode(buf,version)?;
let crc = crc32c::crc32c(&out);
crc.encode(dest,version)?;
dest.put_slice(&out);
Ok(())
}
}
#[derive(Debug,Decode)]
pub struct BatchHeader {
pub partition_leader_epoch: i32,
pub magic: i8,
pub crc: u32,
pub attributes: i16,
pub last_offset_delta: i32,
pub first_timestamp: i64,
pub max_time_stamp: i64,
pub producer_id: i64,
pub producer_epoch: i16,
pub first_sequence: i32,
}
impl Default for BatchHeader {
fn default() -> Self {
BatchHeader {
partition_leader_epoch: -1,
magic: 2,
crc: 0,
attributes: 0,
last_offset_delta: 0,
first_timestamp: 0,
max_time_stamp: 0,
producer_id: -1,
producer_epoch: -1,
first_sequence: -1,
}
}
}
#[allow(dead_code)]
pub const BATCH_HEADER_SIZE: usize =
size_of::<i32>()
+ size_of::<u8>()
+ size_of::<i32>()
+ size_of::<i16>()
+ size_of::<i32>()
+ size_of::<i64>()
+ size_of::<i64>()
+ size_of::<i64>()
+ size_of::<i16>()
+ size_of::<i32>();
#[cfg(test)]
mod test {
use std::io::Cursor;
use std::io::Error as IoError;
use kf_protocol::Decoder;
use kf_protocol::Encoder;
use crate::DefaultRecord;
use crate::DefaultBatch;
#[test]
fn test_encode_and_decode_batch() -> Result<(),IoError> {
let record: DefaultRecord = vec![0x74,0x65,0x73,0x74].into();
let mut batch = DefaultBatch::default();
batch.records.push(record);
batch.header.first_timestamp = 1555478494747;
batch.header.max_time_stamp = 1555478494747;
let bytes = batch.as_bytes(0)?;
println!("batch raw bytes: {:#X?}",bytes.as_ref());
let batch = DefaultBatch::decode_from(&mut Cursor::new(bytes),0)?;
println!("batch: {:#?}",batch);
let decoded_record = batch.records.get(0).unwrap();
println!("record crc: {}",batch.header.crc);
assert_eq!(batch.header.crc, 1514417201);
if let Some(ref b) = decoded_record.value.inner_value_ref() {
assert_eq!(b.as_slice(),"test".to_owned().as_bytes());
} else {
assert!(false);
}
Ok(())
}
#[test]
fn test_records_offset() {
let mut batch = DefaultBatch::default();
batch.add_record(DefaultRecord::default());
batch.add_record(DefaultRecord::default());
batch.add_record(DefaultRecord::default());
assert_eq!(batch.records.get(0).expect("index 0 should exists").get_offset_delta(),0);
assert_eq!(batch.records.get(1).expect("index 1 should exists").get_offset_delta(),1);
assert_eq!(batch.records.get(2).expect("index 2 should exists").get_offset_delta(),2);
assert_eq!(batch.get_last_offset_delta(),2);
}
}