use crate::{
resp::{
ARRAY_TAG, BULK_STRING_TAG, DOUBLE_TAG, ERROR_TAG, INTEGER_TAG, MAP_TAG, PUSH_FAKE_FIELD,
PUSH_TAG, SET_TAG, SIMPLE_STRING_TAG,
},
Error,
};
use bytes::{BufMut, BytesMut};
use dtoa::Float;
use itoa::Integer;
use serde::{
ser::{
self, SerializeMap, SerializeSeq, SerializeStruct, SerializeStructVariant, SerializeTuple,
SerializeTupleStruct, SerializeTupleVariant,
},
Serialize, Serializer,
};
pub(crate) const SET_FAKE_FIELD: &str = "~~~SET~~~";
pub(crate) const ERROR_FAKE_FIELD: &str = "---ERROR---";
pub struct RespSerializer {
output: BytesMut,
is_error: bool,
}
impl RespSerializer {
pub fn new() -> Self {
Self {
output: BytesMut::new(),
is_error: false,
}
}
#[inline]
pub fn get_output(self) -> BytesMut {
self.output
}
fn serialize_raw_integer<I: Integer>(&mut self, i: I) {
let mut temp = itoa::Buffer::new();
let str = temp.format(i);
self.output.put_slice(str.as_bytes());
self.output.put_slice(b"\r\n");
}
fn serialize_integer<I: Integer>(&mut self, i: I) {
self.output.put_u8(INTEGER_TAG);
self.serialize_raw_integer(i);
}
fn serialize_float<F: Float>(&mut self, f: F) {
let mut temp = dtoa::Buffer::new();
let str = temp.format(f);
self.output.put_u8(DOUBLE_TAG);
self.output.put_slice(str.as_bytes());
self.output.put_slice(b"\r\n");
}
}
impl Default for RespSerializer {
fn default() -> Self {
Self::new()
}
}
impl<'a> Serializer for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
type SerializeSeq = Self;
type SerializeTuple = Self;
type SerializeTupleStruct = Self;
type SerializeTupleVariant = Self;
type SerializeMap = Self;
type SerializeStruct = Self;
type SerializeStructVariant = Self;
fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
self.output.put_slice(if v { b"#t\r\n" } else { b"#f\r\n" });
Ok(())
}
fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
self.serialize_integer(v);
Ok(())
}
fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
self.serialize_float(v);
Ok(())
}
fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
self.serialize_float(v);
Ok(())
}
fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
let mut buf = [0; 4];
let str = v.encode_utf8(&mut buf);
self.serialize_str(str)
}
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
if self.is_error {
self.is_error = false;
self.output.put_u8(ERROR_TAG);
} else {
self.output.put_u8(SIMPLE_STRING_TAG);
}
self.output.put_slice(v.as_bytes());
self.output.put_slice(b"\r\n");
Ok(())
}
fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
self.output.put_u8(BULK_STRING_TAG);
self.serialize_raw_integer(v.len());
self.output.put_slice(v);
self.output.put_slice(b"\r\n");
Ok(())
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
self.serialize_unit()
}
fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
where
T: serde::Serialize,
{
value.serialize(self)
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
self.output.put_slice(b"_\r\n");
Ok(())
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
self.serialize_unit()
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
self.serialize_str(variant)
}
fn serialize_newtype_struct<T: ?Sized>(
self,
name: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: serde::Serialize,
{
if name == ERROR_FAKE_FIELD {
self.is_error = true;
}
value.serialize(self)
}
fn serialize_newtype_variant<T: ?Sized>(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: serde::Serialize,
{
self.output.put_u8(MAP_TAG);
self.output.put_slice(b"1\r\n");
variant.serialize(&mut *self)?;
value.serialize(&mut *self)?;
Ok(())
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
let Some(len) = len else {
return Err(ser::Error::custom("expecting len on sequence serialization"));
};
self.output.put_u8(ARRAY_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Self::Error> {
self.serialize_seq(Some(len))
}
fn serialize_tuple_struct(
self,
name: &'static str,
len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
match name {
PUSH_FAKE_FIELD => {
self.output.put_u8(PUSH_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
SET_FAKE_FIELD => {
self.output.put_u8(SET_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
_ => self.serialize_seq(Some(len)),
}
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
self.output.put_u8(MAP_TAG);
self.output.put_slice(b"1\r\n");
variant.serialize(&mut *self)?;
self.output.put_u8(ARRAY_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
let Some(len) = len else {
return Err(ser::Error::custom("expecting len on map serialization"));
};
self.output.put_u8(MAP_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
fn serialize_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
self.serialize_map(Some(len))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
self.output.put_u8(MAP_TAG);
self.output.put_slice(b"1\r\n");
variant.serialize(&mut *self)?;
self.output.put_u8(MAP_TAG);
self.serialize_raw_integer(len);
Ok(self)
}
}
impl<'a> SerializeSeq for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeTuple for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeTupleStruct for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeTupleVariant for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeMap for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
key.serialize(&mut **self)
}
#[inline]
fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeStruct for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
key.serialize(&mut **self)?;
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}
impl<'a> SerializeStructVariant for &'a mut RespSerializer {
type Ok = ();
type Error = Error;
#[inline]
fn serialize_field<T: ?Sized>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), Self::Error>
where
T: serde::Serialize,
{
key.serialize(&mut **self)?;
value.serialize(&mut **self)
}
#[inline]
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(())
}
}