use bytes::BufMut;
use crate::primitives::fixed::{get_i32, put_i32};
use crate::tagged_fields::{WriteTaggedFields, read_tagged_fields, tagged_fields_len};
use crate::{DecodeBorrow, Encode, ProtocolError, UnknownTaggedFields};
pub const MIN_VERSION: i16 = 0;
pub const MAX_VERSION: i16 = 1;
pub const FLEXIBLE_MIN: i16 = 1;
#[inline]
fn is_flexible(version: i16) -> bool {
version >= FLEXIBLE_MIN
}
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct ResponseHeader {
pub correlation_id: i32,
pub unknown_tagged_fields: UnknownTaggedFields,
}
impl ResponseHeader {
pub fn to_owned(&self) -> crate::owned::response_header::ResponseHeader {
crate::owned::response_header::ResponseHeader {
correlation_id: (self.correlation_id),
unknown_tagged_fields: self.unknown_tagged_fields.clone(),
}
}
}
impl Encode for ResponseHeader {
fn encode<B: BufMut>(&self, buf: &mut B, version: i16) -> Result<(), ProtocolError> {
if !(MIN_VERSION..=MAX_VERSION).contains(&version) {
return Err(ProtocolError::SchemaMismatch(
"ResponseHeader version out of range",
));
}
let flex = is_flexible(version);
if version >= 0 {
put_i32(buf, self.correlation_id);
}
if flex {
let tagged = WriteTaggedFields::new();
tagged.write(buf, &self.unknown_tagged_fields);
}
Ok(())
}
fn encoded_len(&self, version: i16) -> usize {
let flex = is_flexible(version);
let mut n: usize = 0;
if version >= 0 {
n += 4;
}
if flex {
let known_pairs: Vec<(u32, usize)> = Vec::new();
n += tagged_fields_len(&known_pairs, &self.unknown_tagged_fields);
}
n
}
}
impl<'de> DecodeBorrow<'de> for ResponseHeader {
fn decode_borrow(buf: &mut &'de [u8], version: i16) -> Result<Self, ProtocolError> {
if !(MIN_VERSION..=MAX_VERSION).contains(&version) {
return Err(ProtocolError::SchemaMismatch(
"ResponseHeader version out of range",
));
}
let flex = is_flexible(version);
let mut out = Self::default();
if version >= 0 {
out.correlation_id = get_i32(buf)?;
}
if flex {
out.unknown_tagged_fields = read_tagged_fields(buf, |_tag, _payload| Ok(false))?;
}
Ok(out)
}
}
#[cfg(test)]
impl ResponseHeader {
#[must_use]
pub fn populated(version: i16) -> Self {
let mut m = Self::default();
if version >= 0 {
m.correlation_id = 1i32;
}
m
}
}