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use std::default::Default;
use std::io::Error as IoError;
use std::io::ErrorKind;
use std::fs::File;
use std::io::Cursor;
use std::path::Path;
use std::io::Read;
use std::fmt::Debug;
use std::fmt;
use std::convert::TryFrom;
use log::trace;
use log::debug;
use crate::core::Decoder;
use crate::core::Encoder;
use crate::derive::Decode;
use crate::derive::Encode;
use crate::core::bytes::Buf;
pub trait Request: Encoder + Decoder + Debug {
const API_KEY: u16;
const DEFAULT_API_VERSION: i16 = 0;
const MIN_API_VERSION: i16 = 0;
const MAX_API_VERSION: i16 = -1;
type Response: Encoder + Decoder + Debug ;
}
pub trait ApiMessage: Sized + Default
{
type ApiKey: Decoder + Debug ;
fn decode_with_header<T>(src: &mut T, header: RequestHeader) -> Result<Self,IoError>
where
Self: Default + Sized,
Self::ApiKey: Sized,
T: Buf;
fn decode_from<T>(src: &mut T) -> Result<Self,IoError>
where T: Buf,
{
let header = RequestHeader::decode_from(src,0)?;
Self::decode_with_header(src,header)
}
fn decode_from_file<P: AsRef<Path>>(file_name: P) -> Result<Self,IoError> {
debug!("decoding from file: {:#?}", file_name.as_ref());
let mut f = File::open(file_name)?;
let mut buffer: [u8; 1000] = [0; 1000];
f.read_exact(&mut buffer)?;
let data = buffer.to_vec();
let mut src = Cursor::new(&data);
let mut size: i32 = 0;
size.decode(&mut src,0)?;
trace!("decoded request size: {} bytes", size);
if src.remaining() < size as usize {
return Err(IoError::new(
ErrorKind::UnexpectedEof,
"not enought bytes for request message",
));
}
Self::decode_from(&mut src)
}
}
pub trait ApiKey: Sized + Encoder + Decoder + TryFrom<u16> {
}
#[derive(Debug, Encode, Decode, Default)]
pub struct RequestHeader {
api_key: u16,
api_version: i16,
correlation_id: i32,
client_id: String,
}
impl fmt::Display for RequestHeader {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f,"api: {} client: {}",self.api_key,self.client_id)
}
}
impl RequestHeader {
pub fn new(api_key: u16) -> Self {
Self::new_with_client(api_key,"dummy".to_owned())
}
pub fn new_with_client<T>(api_key: u16,client_id: T) -> Self
where T: Into<String>
{
RequestHeader {
api_key,
api_version: 1,
correlation_id: 1,
client_id: client_id.into()
}
}
pub fn api_key(&self) -> u16 {
self.api_key
}
pub fn api_version(&self) -> i16 {
self.api_version
}
pub fn set_api_version(&mut self,version: i16) -> &mut Self {
self.api_version = version;
self
}
pub fn correlation_id(&self) -> i32 {
self.correlation_id
}
pub fn set_correlation_id(&mut self,id: i32) -> &mut Self {
self.correlation_id = id;
self
}
pub fn client_id(&self) -> &String {
&self.client_id
}
pub fn set_client_id<T>(&mut self,client_id: T) -> &mut Self
where T: Into<String>
{
self.client_id = client_id.into();
self
}
}
impl From<&RequestHeader> for i32 {
fn from(header: &RequestHeader) -> i32 {
header.correlation_id()
}
}