use alloc::{
borrow::ToOwned,
collections::BTreeMap,
format,
string::{String, ToString},
vec::Vec,
};
use core::convert::TryFrom;
use cid::serde::CID_SERDE_PRIVATE_IDENTIFIER;
use cid::Cid;
use serde::ser;
use crate::error::SerdeError;
use crate::ipld::Ipld;
pub fn to_ipld<T>(value: T) -> Result<Ipld, SerdeError>
where
T: ser::Serialize,
{
value.serialize(Serializer)
}
impl ser::Serialize for Ipld {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: ser::Serializer,
{
match &self {
Self::Null => serializer.serialize_none(),
Self::Bool(value) => serializer.serialize_bool(*value),
Self::Integer(value) => serializer.serialize_i128(*value),
Self::Float(value) => serializer.serialize_f64(*value),
Self::String(value) => serializer.serialize_str(value),
Self::Bytes(value) => serializer.serialize_bytes(value),
Self::List(value) => serializer.collect_seq(value),
Self::Map(value) => serializer.collect_map(value),
Self::Link(value) => value.serialize(serializer),
}
}
}
pub struct Serializer;
impl serde::Serializer for Serializer {
type Ok = Ipld;
type Error = SerdeError;
type SerializeSeq = SerializeVec;
type SerializeTuple = SerializeVec;
type SerializeTupleStruct = SerializeVec;
type SerializeTupleVariant = SerializeTupleVariant;
type SerializeMap = SerializeMap;
type SerializeStruct = SerializeMap;
type SerializeStructVariant = SerializeStructVariant;
#[inline]
fn serialize_bool(self, value: bool) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Bool(value))
}
#[inline]
fn serialize_i8(self, value: i8) -> Result<Self::Ok, Self::Error> {
self.serialize_i64(i64::from(value))
}
#[inline]
fn serialize_i16(self, value: i16) -> Result<Self::Ok, Self::Error> {
self.serialize_i64(i64::from(value))
}
#[inline]
fn serialize_i32(self, value: i32) -> Result<Self::Ok, Self::Error> {
self.serialize_i64(i64::from(value))
}
#[inline]
fn serialize_i64(self, value: i64) -> Result<Self::Ok, Self::Error> {
self.serialize_i128(i128::from(value))
}
fn serialize_i128(self, value: i128) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Integer(value))
}
#[inline]
fn serialize_u8(self, value: u8) -> Result<Self::Ok, Self::Error> {
self.serialize_i128(value.into())
}
#[inline]
fn serialize_u16(self, value: u16) -> Result<Self::Ok, Self::Error> {
self.serialize_i128(value.into())
}
#[inline]
fn serialize_u32(self, value: u32) -> Result<Self::Ok, Self::Error> {
self.serialize_i128(value.into())
}
#[inline]
fn serialize_u64(self, value: u64) -> Result<Self::Ok, Self::Error> {
self.serialize_i128(value.into())
}
#[inline]
fn serialize_f32(self, value: f32) -> Result<Self::Ok, Self::Error> {
self.serialize_f64(f64::from(value))
}
#[inline]
fn serialize_f64(self, value: f64) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Float(value))
}
#[inline]
fn serialize_char(self, value: char) -> Result<Self::Ok, Self::Error> {
self.serialize_str(&value.to_string())
}
#[inline]
fn serialize_str(self, value: &str) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::String(value.to_owned()))
}
fn serialize_bytes(self, value: &[u8]) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Bytes(value.to_vec()))
}
#[inline]
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("Unit is not supported"))
}
#[inline]
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("Unit structs are not supported"))
}
#[inline]
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
self.serialize_str(variant)
}
#[inline]
fn serialize_newtype_struct<T: ?Sized>(
self,
name: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: ser::Serialize,
{
let ipld = value.serialize(self);
if name == CID_SERDE_PRIVATE_IDENTIFIER {
if let Ok(Ipld::Bytes(bytes)) = ipld {
let cid = Cid::try_from(bytes)
.map_err(|err| ser::Error::custom(format!("Invalid CID: {}", err)))?;
return Ok(Self::Ok::Link(cid));
}
}
ipld
}
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: ser::Serialize,
{
let values = BTreeMap::from([(variant.to_owned(), value.serialize(self)?)]);
Ok(Self::Ok::Map(values))
}
#[inline]
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Null)
}
#[inline]
fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
where
T: ser::Serialize,
{
value.serialize(self)
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
Ok(SerializeVec {
vec: Vec::with_capacity(len.unwrap_or(0)),
})
}
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> {
self.serialize_tuple(len)
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
Ok(SerializeTupleVariant {
name: String::from(variant),
vec: Vec::with_capacity(len),
})
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
Ok(SerializeMap {
map: BTreeMap::new(),
next_key: None,
})
}
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> {
Ok(SerializeStructVariant {
name: String::from(variant),
map: BTreeMap::new(),
})
}
#[inline]
fn is_human_readable(&self) -> bool {
false
}
}
pub struct SerializeVec {
vec: Vec<Ipld>,
}
pub struct SerializeTupleVariant {
name: String,
vec: Vec<Ipld>,
}
pub struct SerializeMap {
map: BTreeMap<String, Ipld>,
next_key: Option<String>,
}
pub struct SerializeStructVariant {
name: String,
map: BTreeMap<String, Ipld>,
}
impl ser::SerializeSeq for SerializeVec {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
self.vec.push(value.serialize(Serializer)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::List(self.vec))
}
}
impl ser::SerializeTuple for SerializeVec {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
ser::SerializeSeq::serialize_element(self, value)
}
fn end(self) -> Result<Self::Ok, Self::Error> {
ser::SerializeSeq::end(self)
}
}
impl ser::SerializeTupleStruct for SerializeVec {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
ser::SerializeSeq::serialize_element(self, value)
}
fn end(self) -> Result<Self::Ok, Self::Error> {
ser::SerializeSeq::end(self)
}
}
impl ser::SerializeTupleVariant for SerializeTupleVariant {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
self.vec.push(value.serialize(Serializer)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
let map = BTreeMap::from([(self.name, Self::Ok::List(self.vec))]);
Ok(Self::Ok::Map(map))
}
}
impl ser::SerializeMap for SerializeMap {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
match key.serialize(Serializer)? {
Ipld::String(string_key) => {
self.next_key = Some(string_key);
Ok(())
}
_ => Err(ser::Error::custom("Map keys must be strings".to_string())),
}
}
fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
let key = self.next_key.take();
let key = key.expect("serialize_value called before serialize_key");
self.map.insert(key, value.serialize(Serializer)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(Self::Ok::Map(self.map))
}
}
impl ser::SerializeStruct for SerializeMap {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_field<T: ?Sized>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
serde::ser::SerializeMap::serialize_key(self, key)?;
serde::ser::SerializeMap::serialize_value(self, value)
}
fn end(self) -> Result<Self::Ok, Self::Error> {
serde::ser::SerializeMap::end(self)
}
}
impl ser::SerializeStructVariant for SerializeStructVariant {
type Ok = Ipld;
type Error = SerdeError;
fn serialize_field<T: ?Sized>(
&mut self,
key: &'static str,
value: &T,
) -> Result<(), Self::Error>
where
T: ser::Serialize,
{
self.map
.insert(key.to_string(), value.serialize(Serializer)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
let mut object = BTreeMap::new();
object.insert(self.name, Self::Ok::Map(self.map));
Ok(Self::Ok::Map(object))
}
}