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wormhole
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sdk/rust: Add serde_wormhole::RawMessage 

Add a RawMessage type that can be used to defer parsing parts of a
payload, similar to the `json.RawMessage` from Go.  The implementation
is inspired by `serde_json::RawValue`, which does a similar thing.

When serializing, RawMessage will serialize to a base64-encoded string
if it detects that the data format is human readable (like JSON).
Otherwise it will simply forward the raw bytes to the serializer.

RawMessage has both borrowed and boxed versions.  The borrowed version
is the most efficient as it enables zero-copy handling of the input data
but also requires that the input data already contains raw bytes and is
not suitable when dealing with human-readable formats like JSON.

The boxed version is more flexible as it supports byte slices, base64-
encoded strings, and byte sequences but is slightly less efficient as it
requires copying or decoding the input data.
This commit is contained in:
Chirantan Ekbote 2023-01-11 19:36:35 +09:00 committed by Chirantan Ekbote
parent 8f08d68baa
commit 3c6702b6f7
7 changed files with 688 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cosmwasm/Cargo.lock generated
View File

@ -1649,8 +1649,10 @@ dependencies = [
name = "serde_wormhole"
version = "0.1.0"
dependencies = [
"base64",
"itoa",
"serde",
"serde_bytes",
"thiserror",
]

8
sdk/rust/Cargo.lock generated
View File

@ -8,6 +8,12 @@ version = "1.0.66"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
[[package]]
name = "base64"
version = "0.13.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
[[package]]
name = "block-buffer"
version = "0.10.3"
@ -209,9 +215,11 @@ dependencies = [
name = "serde_wormhole"
version = "0.1.0"
dependencies = [
"base64",
"itoa",
"serde",
"serde_bytes",
"serde_json",
"serde_repr",
"thiserror",
]

4
sdk/rust/serde_wormhole/Cargo.toml
View File

@ -5,11 +5,13 @@ edition = "2021"
description = "Serde data format for VAA payloads"
[dependencies]
base64 = "0.13"
itoa = "1.0.1"
serde = { version = "1.0.103", default-features = false }
serde_bytes = "0.11.5"
thiserror = "1.0"
[dev-dependencies]
serde = { version = "1.0.103", default-features = false, features = ["alloc", "derive"] }
serde_bytes = "0.11.5"
serde_json = "1"
serde_repr = "0.1.7"

18
sdk/rust/serde_wormhole/src/de.rs
View File

@ -1,8 +1,11 @@
use std::{convert::TryFrom, mem::size_of};
use std::{
convert::TryFrom,
mem::{self, size_of},
};
use serde::de::{
self, DeserializeSeed, EnumAccess, Error as DeError, IntoDeserializer, MapAccess, SeqAccess,
VariantAccess, Visitor,
self, value::BorrowedBytesDeserializer, DeserializeSeed, EnumAccess, Error as DeError,
IntoDeserializer, MapAccess, SeqAccess, VariantAccess, Visitor,
};
use crate::error::Error;
@ -250,13 +253,18 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
#[inline]
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
visitor.visit_newtype_struct(self)
if name == crate::raw::TOKEN {
let rem = mem::take(&mut self.input);
visitor.visit_newtype_struct(BorrowedBytesDeserializer::new(rem))
} else {
visitor.visit_newtype_struct(self)
}
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>

2
sdk/rust/serde_wormhole/src/lib.rs
View File

@ -127,9 +127,11 @@ use serde::{de::DeserializeOwned, Deserialize, Serialize};
mod de;
mod error;
mod raw;
mod ser;
pub use error::Error;
pub use raw::{to_raw_message, RawMessage};
/// Deserialize an instance of type `T` from the provided reader.
pub fn from_reader<R: Read, T: DeserializeOwned>(mut r: R) -> Result<T, Error> {

466
sdk/rust/serde_wormhole/src/raw.rs Normal file
View File

@ -0,0 +1,466 @@
use std::{fmt, ops::Deref};
use base64::display::Base64Display;
use serde::{
de::{Error as DeError, SeqAccess, Visitor},
Deserialize, Deserializer, Serialize, Serializer,
};
use serde_bytes::Bytes;
use crate::Error;
pub(crate) const TOKEN: &str = "$serde_wormhole::private::RawMessage";
/// Reference to a range of bytes in the input data.
///
/// A `RawMessage` can be used to defer parsing parts of the input data until later, or to avoid
/// parsing it at all if it needs to be passed on verbatim to a different output object.
///
/// When used to deserialize data in the wormhole data format, `RawMessage` will consume all the
/// remaining data in the input since the wormhole wire format is not self-describing. However when
/// used with self-describing formats like JSON, `RawMessage` will expect either a sequence of bytes
/// or a base64-encoded string.
///
/// When serializing, a `RawMessage` will either serialize to a base64-encoded string if the data
/// format is human readable (like JSON) or will forward the raw bytes to the serializer if not.
///
/// # Examples
///
/// Defer parsing the payload of a VAA body:
///
/// ```
/// # fn example() -> Result<(), serde_wormhole::Error> {
/// # let data = [
/// # 0x62, 0xb9, 0xf7, 0x91, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
/// # 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf1, 0x9a, 0x2a, 0x01, 0xb7, 0x05, 0x19, 0xf6,
/// # 0x7a, 0xdb, 0x30, 0x9a, 0x99, 0x4e, 0xc8, 0xc6, 0x9a, 0x96, 0x7e, 0x8b, 0x00, 0x00, 0x00,
/// # 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x46, 0x72, 0x6f, 0x6d, 0x3a, 0x20, 0x65, 0x76, 0x6d,
/// # 0x30, 0x5c, 0x6e, 0x4d, 0x73, 0x67, 0x3a, 0x20, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57,
/// # 0x6f, 0x72, 0x6c, 0x64, 0x21,
/// # ];
/// #
/// use serde::{Serialize, Deserialize};
/// use serde_wormhole::{from_slice, RawMessage};
///
/// #[derive(Serialize, Deserialize, Debug)]
/// struct Body<'a> {
/// timestamp: u32,
/// nonce: u32,
/// emitter_chain: u16,
/// emitter_address: [u8; 32],
/// sequence: u64,
/// consistency_level: u8,
/// #[serde(borrow)]
/// payload: &'a RawMessage,
/// }
///
/// let body = from_slice::<Body>(&data)?;
/// assert_eq!(b"From: evm0\\nMsg: Hello World!", body.payload.get());
/// #
/// # Ok(())
/// # }
/// #
/// # example().unwrap();
/// ```
///
/// # Ownership
///
/// The typical usage of `RawMessage` will be in its borrowed form:
///
/// ```
/// # use serde::Deserialize;
/// # use serde_wormhole::RawMessage;
/// #
/// #[derive(Deserialize)]
/// struct MyStruct<'a> {
/// #[serde(borrow)]
/// raw_message: &'a RawMessage,
/// }
/// ```
///
/// The borrowed form is suitable for use with `serde_wormhole::from_slice` because it supports
/// borrowing from the input data without memory allocation. If the value is encoded as a string,
/// deserializing to the borrowed form may or may not succeed depending on the deserializer
/// implementation. In the case where the deserialization is successful, the contents of the string
/// will not be interpreted in any way and the `RawMessage` will simply contain the raw bytes of
/// the input string. This may have unexpected consequences (such as the bytes being base64-encoded
/// if the `RawMessage` is re-serialized, potentially leading to double-encoding). In general, you
/// should only use the borrowed form if you know the input data contains raw bytes. Otherwise, the
/// boxed form is a safer choice.
///
/// When deserializing through `serde_wormhole::from_reader` or when the value is encoded as a
/// base64 string, it is necessary to use the boxed form. This involves either copying the data
/// from the IO stream or decoding the base64 string and then storing it in memory.
///
/// ```
/// # use serde::Deserialize;
/// # use serde_wormhole::RawMessage;
/// #
/// #[derive(Deserialize)]
/// struct MyStruct {
/// raw_message: Box<RawMessage>,
/// }
/// ```
#[repr(transparent)]
#[derive(PartialEq, Eq, PartialOrd, Ord)]
pub struct RawMessage {
bytes: [u8],
}
impl RawMessage {
const fn from_borrowed(b: &[u8]) -> &Self {
// Safety: repr(transparent) guarantees that `RawMessage` and `[u8]` have the same layout
// and ABI.
unsafe { &*(b as *const [u8] as *const RawMessage) }
}
fn from_owned(b: Box<[u8]>) -> Box<Self> {
#[cfg(debug_assertions)]
{
use std::alloc::Layout;
let a = Layout::for_value::<[u8]>(&b);
let b = Layout::for_value::<RawMessage>(Self::from_borrowed(&b));
debug_assert_eq!(a, b);
}
// Safety: repr(transparent) guarantees that `RawMessage` and `[u8]` have the same layout
// and ABI.
unsafe { Box::from_raw(Box::into_raw(b) as *mut Self) }
}
fn into_owned(self: Box<Self>) -> Box<[u8]> {
#[cfg(debug_assertions)]
{
use std::alloc::Layout;
let a = Layout::for_value::<RawMessage>(&self);
let b = Layout::for_value::<[u8]>(&self.bytes);
debug_assert_eq!(a, b);
}
// Safety: repr(transparent) guarantees that `RawMessage` and `[u8]` have the same layout
// and ABI.
unsafe { Box::from_raw(Box::into_raw(self) as *mut [u8]) }
}
/// Create a new borrowed `RawMessage` from an existing `&[u8]`.
pub const fn new(b: &[u8]) -> &Self {
Self::from_borrowed(b)
}
/// Access the raw bytes underlying a `RawMessage`.
pub const fn get(&self) -> &[u8] {
&self.bytes
}
}
impl<'a> From<&'a [u8]> for &'a RawMessage {
fn from(value: &'a [u8]) -> Self {
RawMessage::new(value)
}
}
impl<'a> From<&'a RawMessage> for &'a [u8] {
fn from(value: &'a RawMessage) -> Self {
&value.bytes
}
}
impl From<Vec<u8>> for Box<RawMessage> {
fn from(value: Vec<u8>) -> Self {
RawMessage::from_owned(value.into_boxed_slice())
}
}
impl From<Box<[u8]>> for Box<RawMessage> {
fn from(value: Box<[u8]>) -> Self {
RawMessage::from_owned(value)
}
}
impl From<Box<RawMessage>> for Box<[u8]> {
fn from(value: Box<RawMessage>) -> Self {
value.into_owned()
}
}
impl AsRef<[u8]> for RawMessage {
fn as_ref(&self) -> &[u8] {
&self.bytes
}
}
impl Deref for RawMessage {
type Target = [u8];
fn deref(&self) -> &Self::Target {
&self.bytes
}
}
impl fmt::Debug for RawMessage {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("RawMessage")
.field(&format_args!("{:?}", &self.bytes))
.finish()
}
}
impl fmt::Display for RawMessage {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{}",
Base64Display::with_config(&self.bytes, base64::STANDARD)
)
}
}
impl ToOwned for RawMessage {
type Owned = Box<RawMessage>;
fn to_owned(&self) -> Self::Owned {
RawMessage::from_owned(self.bytes.to_owned().into_boxed_slice())
}
}
impl Clone for Box<RawMessage> {
fn clone(&self) -> Self {
(**self).to_owned()
}
}
impl Default for Box<RawMessage> {
fn default() -> Self {
RawMessage::from_owned(Default::default())
}
}
impl Serialize for RawMessage {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if serializer.is_human_readable() {
let bytes = base64::encode(&self.bytes);
serializer.serialize_newtype_struct(TOKEN, &bytes)
} else {
serializer.serialize_newtype_struct(TOKEN, Bytes::new(&self.bytes))
}
}
}
impl<'a, 'de: 'a> Deserialize<'de> for &'a RawMessage {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct ReferenceVisitor;
impl<'de> Visitor<'de> for ReferenceVisitor {
type Value = &'de RawMessage;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a borrowed byte slice")
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_bytes(self)
}
fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>
where
E: DeError,
{
Ok(RawMessage::from_borrowed(v))
}
}
deserializer.deserialize_newtype_struct(TOKEN, ReferenceVisitor)
}
}
impl<'de> Deserialize<'de> for Box<RawMessage> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct BoxedVisitor;
impl<'de> Visitor<'de> for BoxedVisitor {
type Value = Box<RawMessage>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a byte slice or a base64-encoded string")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: DeError,
{
let v = base64::decode(v)
.map_err(|e| E::custom(format_args!("failed to decode base64: {e}")))?;
Ok(RawMessage::from_owned(v.into_boxed_slice()))
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_any(self)
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: DeError,
{
Ok(RawMessage::from_owned(v.to_owned().into_boxed_slice()))
}
fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
where
E: DeError,
{
Ok(RawMessage::from_owned(v.into_boxed_slice()))
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: SeqAccess<'de>,
{
let mut buf = Vec::with_capacity(seq.size_hint().unwrap_or(0));
while let Some(b) = seq.next_element()? {
buf.push(b);
}
Ok(RawMessage::from_owned(buf.into_boxed_slice()))
}
}
deserializer.deserialize_newtype_struct(TOKEN, BoxedVisitor)
}
}
/// Convert a `T` into a boxed `RawMessage`.
pub fn to_raw_message<T: Serialize + ?Sized>(value: &T) -> Result<Box<RawMessage>, Error> {
let bytes = crate::to_vec(value)?;
Ok(RawMessage::from_owned(bytes.into_boxed_slice()))
}
#[cfg(test)]
mod test {
use super::*;
#[derive(Serialize, Deserialize, Debug, PartialEq)]
struct MyStruct<P> {
f1: u32,
f2: u16,
payload: P,
}
#[test]
fn borrowed() {
let data = [
0x5b, 0x4a, 0x55, 0xca, 0x80, 0x53, 0xfe, 0x25, 0x6d, 0xdc, 0xb3, 0x3b, 0x8d, 0x38,
0xf7, 0x1b,
];
let expected = MyStruct {
f1: 0x5b4a55ca,
f2: 0x8053,
payload: RawMessage::from_borrowed(&data[6..]),
};
let actual = crate::from_slice::<MyStruct<&RawMessage>>(&data).unwrap();
assert_eq!(expected, actual);
assert_eq!(&data[..], crate::to_vec(&expected).unwrap());
}
#[test]
fn owned() {
let data = [
0x5b, 0x4a, 0x55, 0xca, 0x80, 0x53, 0xfe, 0x25, 0x6d, 0xdc, 0xb3, 0x3b, 0x8d, 0x38,
0xf7, 0x1b,
];
let expected = MyStruct {
f1: 0x5b4a55ca,
f2: 0x8053,
payload: Box::<RawMessage>::from(data[6..].to_vec()),
};
let actual = crate::from_slice::<MyStruct<Box<RawMessage>>>(&data).unwrap();
assert_eq!(expected, actual);
assert_eq!(&data[..], crate::to_vec(&expected).unwrap());
}
#[test]
fn json_string() {
#[derive(Serialize, Deserialize, Debug, PartialEq)]
struct MyStruct {
f1: u32,
payload: Box<RawMessage>,
f2: u16,
}
let data = r#"{"f1":1531598282,"payload":"/iVt3LM7jTj3Gw==","f2":32851}"#;
let expected = MyStruct {
f1: 0x5b4a55ca,
payload: Box::<RawMessage>::from(vec![
0xfe, 0x25, 0x6d, 0xdc, 0xb3, 0x3b, 0x8d, 0x38, 0xf7, 0x1b,
]),
f2: 0x8053,
};
let actual = serde_json::from_str(data).unwrap();
assert_eq!(expected, actual);
assert_eq!(data, serde_json::to_string(&expected).unwrap());
}
#[test]
fn json_sequence() {
let data = r#"{"f1":1531598282,"f2":32851,"payload":[223,35,191,255,175]}"#;
let expected = MyStruct {
f1: 0x5b4a55ca,
f2: 0x8053,
payload: Box::<RawMessage>::from(vec![223, 35, 191, 255, 175]),
};
let actual = serde_json::from_str(data).unwrap();
assert_eq!(expected, actual);
}
#[test]
fn json_reference() {
#[derive(Serialize, Deserialize, Debug, PartialEq)]
struct Referenced<'a> {
#[serde(borrow)]
raw_message: &'a RawMessage,
}
let data = r#"{"raw_message":"/iVt3LM7jTj3Gw=="}"#;
let expected = Referenced {
raw_message: RawMessage::from_borrowed(&[
0x2f, 0x69, 0x56, 0x74, 0x33, 0x4c, 0x4d, 0x37, 0x6a, 0x54, 0x6a, 0x33, 0x47, 0x77,
0x3d, 0x3d,
]),
};
// This works because serde_json will forward the raw bytes of the string to the visitor
// but the content won't be decoded. This *would not* work if the value contained invalid
// UTF-8.
let actual = serde_json::from_str::<Referenced>(data).unwrap();
assert_eq!(expected, actual);
// Serializing will re-encode the bytes so we'll get a different result.
assert_eq!(
r#"{"raw_message":"L2lWdDNMTTdqVGozR3c9PQ=="}"#.as_bytes(),
serde_json::to_vec(&expected).unwrap()
);
}
}

198
sdk/rust/serde_wormhole/src/ser.rs
View File

@ -1,6 +1,9 @@
use std::{convert::TryFrom, fmt::Display, io::Write};
use serde::{ser, Serialize};
use serde::{
ser::{self, Impossible},
Serialize,
};
use crate::Error;
@ -149,16 +152,19 @@ impl<'a, W: Write> ser::Serializer for &'a mut Serializer<W> {
self.writer.write_all(&[v]).map_err(Error::from)
}
#[inline]
fn serialize_newtype_struct<T: ?Sized>(
self,
_name: &'static str,
name: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
value.serialize(self)
if name == crate::raw::TOKEN {
value.serialize(RawMessageSerializer(&mut self.writer))
} else {
value.serialize(self)
}
}
fn serialize_newtype_variant<T: ?Sized>(
@ -419,6 +425,190 @@ impl<'a, W: Write> ser::SerializeMap for &'a mut Serializer<W> {
}
}
struct RawMessageSerializer<W>(W);
impl<W: Write> ser::Serializer for RawMessageSerializer<W> {
type Ok = ();
type Error = Error;
type SerializeSeq = Impossible<Self::Ok, Self::Error>;
type SerializeTuple = Impossible<Self::Ok, Self::Error>;
type SerializeTupleStruct = Impossible<Self::Ok, Self::Error>;
type SerializeTupleVariant = Impossible<Self::Ok, Self::Error>;
type SerializeMap = Impossible<Self::Ok, Self::Error>;
type SerializeStruct = Impossible<Self::Ok, Self::Error>;
type SerializeStructVariant = Impossible<Self::Ok, Self::Error>;
fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_i128(self, _v: i128) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_u128(self, _v: u128) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_bytes(mut self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
self.0.write_all(v)?;
Ok(())
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_some<T: ?Sized>(self, _value: &T) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_newtype_struct<T: ?Sized>(
self,
_name: &'static str,
_value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize,
{
Err(ser::Error::custom("expected RawMessage"))
}
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: Serialize,
{
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
Err(ser::Error::custom("expected RawMessage"))
}
fn is_human_readable(&self) -> bool {
false
}
}
#[cfg(test)]
mod tests {
use std::{borrow::Cow, collections::BTreeMap};