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664 lines
20 KiB
Rust
664 lines
20 KiB
Rust
use std::borrow::Cow;
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use std::io;
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use derive_more::{Display, Error};
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use serde::de::DeserializeOwned;
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use serde::{Deserialize, Serialize};
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use super::{read_header_bytes, read_str_bytes, Header, Id};
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use crate::common::utils;
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use crate::header;
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/// Represents a response received related to some response.
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct Response<T> {
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/// Optional header data to include with response.
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pub header: Header,
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/// Unique id associated with the response.
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pub id: Id,
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/// Unique id associated with the response that triggered the response.
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pub origin_id: Id,
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/// Payload associated with the response.
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pub payload: T,
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}
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impl<T> Response<T> {
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/// Creates a new response with a random, unique id and no header data.
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pub fn new(origin_id: Id, payload: T) -> Self {
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Self {
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header: header!(),
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id: rand::random::<u64>().to_string(),
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origin_id,
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payload,
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}
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}
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}
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impl<T> Response<T>
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where
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T: Serialize,
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{
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/// Serializes the response into bytes using a compact approach.
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pub fn to_vec(&self) -> std::io::Result<Vec<u8>> {
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Ok(self.to_untyped_response()?.to_bytes())
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}
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/// Serializes the response's payload into bytes.
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pub fn to_payload_vec(&self) -> io::Result<Vec<u8>> {
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utils::serialize_to_vec(&self.payload)
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}
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/// Attempts to convert a typed response to an untyped response.
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pub fn to_untyped_response(&self) -> io::Result<UntypedResponse> {
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Ok(UntypedResponse {
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header: Cow::Owned(if !self.header.is_empty() {
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self.header.to_vec()?
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} else {
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Vec::new()
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}),
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id: Cow::Borrowed(&self.id),
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origin_id: Cow::Borrowed(&self.origin_id),
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payload: Cow::Owned(self.to_payload_vec()?),
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})
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}
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}
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impl<T> Response<T>
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where
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T: DeserializeOwned,
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{
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/// Deserializes the response from bytes.
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pub fn from_slice(slice: &[u8]) -> std::io::Result<Self> {
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UntypedResponse::from_slice(slice)
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.map_err(|x| io::Error::new(io::ErrorKind::InvalidData, x))?
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.to_typed_response()
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}
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}
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mod serde_impl {
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use super::*;
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use serde::de::{self, Deserialize, Deserializer, SeqAccess, Visitor};
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use serde::ser::{Serialize, SerializeSeq, Serializer};
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use std::fmt;
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use std::marker::PhantomData;
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impl<T> Serialize for Response<T>
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where
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T: Serialize,
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{
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let has_header = !self.header.is_empty();
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let mut cnt = 3;
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if has_header {
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cnt += 1;
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}
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let mut seq = serializer.serialize_seq(Some(cnt))?;
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if has_header {
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seq.serialize_element(&self.header)?;
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}
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seq.serialize_element(&self.id)?;
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seq.serialize_element(&self.origin_id)?;
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seq.serialize_element(&self.payload)?;
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seq.end()
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}
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}
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impl<'de, T> Deserialize<'de> for Response<T>
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where
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T: Deserialize<'de>,
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{
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'de>,
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{
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deserializer.deserialize_seq(ResponseVisitor::new())
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}
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}
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struct ResponseVisitor<T> {
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marker: PhantomData<fn() -> Response<T>>,
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}
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impl<T> ResponseVisitor<T> {
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fn new() -> Self {
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Self {
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marker: PhantomData,
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}
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}
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}
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impl<'de, T> Visitor<'de> for ResponseVisitor<T>
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where
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T: Deserialize<'de>,
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{
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type Value = Response<T>;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a response")
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}
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fn visit_seq<S>(self, mut access: S) -> Result<Self::Value, S::Error>
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where
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S: SeqAccess<'de>,
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{
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// Attempt to determine if we have a header based on size, defaulting to attempting
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// to parse the header first if we don't know the size. If we cannot parse the header,
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// we use the default header and keep going.
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let header = match access.size_hint() {
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Some(3) => Header::default(),
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Some(4) => access
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.next_element()?
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.ok_or_else(|| de::Error::custom("missing header"))?,
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Some(_) => return Err(de::Error::custom("invalid response array len")),
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None => access
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.next_element::<Header>()
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.ok()
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.flatten()
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.unwrap_or_default(),
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};
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let id = access
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.next_element()?
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.ok_or_else(|| de::Error::custom("missing id"))?;
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let origin_id = access
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.next_element()?
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.ok_or_else(|| de::Error::custom("missing origin_id"))?;
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let payload = access
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.next_element()?
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.ok_or_else(|| de::Error::custom("missing payload"))?;
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Ok(Response {
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header,
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id,
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origin_id,
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payload,
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})
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}
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}
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}
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/// Error encountered when attempting to parse bytes as an untyped response.
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#[derive(Copy, Clone, Debug, Display, Error, PartialEq, Eq, Hash)]
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pub enum UntypedResponseParseError {
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/// When the bytes do not represent a response.
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WrongType,
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/// When a header should be present, but the header bytes are wrong.
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InvalidHeader,
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/// When the id is not a valid UTF-8 string.
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InvalidId,
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/// When the origin id is not a valid UTF-8 string.
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InvalidOriginId,
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/// When no payload found in the request.
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MissingPayload,
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}
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#[inline]
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fn header_is_empty(header: &[u8]) -> bool {
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header.is_empty()
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}
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/// Represents a response to send whose payload is bytes instead of a specific type.
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#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
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pub struct UntypedResponse<'a> {
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/// Header data associated with the response as bytes.
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#[serde(default, skip_serializing_if = "header_is_empty")]
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pub header: Cow<'a, [u8]>,
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/// Unique id associated with the response.
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pub id: Cow<'a, str>,
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/// Unique id associated with the response that triggered the response.
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pub origin_id: Cow<'a, str>,
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/// Payload associated with the response as bytes.
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pub payload: Cow<'a, [u8]>,
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}
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impl<'a> UntypedResponse<'a> {
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/// Attempts to convert an untyped response to a typed response.
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pub fn to_typed_response<T: DeserializeOwned>(&self) -> io::Result<Response<T>> {
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Ok(Response {
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header: if header_is_empty(&self.header) {
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header!()
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} else {
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Header::from_slice(&self.header)?
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},
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id: self.id.to_string(),
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origin_id: self.origin_id.to_string(),
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payload: utils::deserialize_from_slice(&self.payload)?,
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})
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}
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/// Convert into a borrowed version.
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pub fn as_borrowed(&self) -> UntypedResponse<'_> {
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UntypedResponse {
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header: match &self.header {
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Cow::Borrowed(x) => Cow::Borrowed(x),
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Cow::Owned(x) => Cow::Borrowed(x.as_slice()),
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},
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id: match &self.id {
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Cow::Borrowed(x) => Cow::Borrowed(x),
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Cow::Owned(x) => Cow::Borrowed(x.as_str()),
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},
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origin_id: match &self.origin_id {
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Cow::Borrowed(x) => Cow::Borrowed(x),
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Cow::Owned(x) => Cow::Borrowed(x.as_str()),
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},
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payload: match &self.payload {
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Cow::Borrowed(x) => Cow::Borrowed(x),
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Cow::Owned(x) => Cow::Borrowed(x.as_slice()),
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},
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}
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}
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/// Convert into an owned version.
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pub fn into_owned(self) -> UntypedResponse<'static> {
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UntypedResponse {
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header: match self.header {
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Cow::Borrowed(x) => Cow::Owned(x.to_vec()),
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Cow::Owned(x) => Cow::Owned(x),
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},
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id: match self.id {
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Cow::Borrowed(x) => Cow::Owned(x.to_string()),
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Cow::Owned(x) => Cow::Owned(x),
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},
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origin_id: match self.origin_id {
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Cow::Borrowed(x) => Cow::Owned(x.to_string()),
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Cow::Owned(x) => Cow::Owned(x),
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},
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payload: match self.payload {
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Cow::Borrowed(x) => Cow::Owned(x.to_vec()),
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Cow::Owned(x) => Cow::Owned(x),
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},
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}
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}
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/// Updates the header of the response to the given `header`.
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pub fn set_header(&mut self, header: impl IntoIterator<Item = u8>) {
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self.header = Cow::Owned(header.into_iter().collect());
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}
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/// Updates the id of the response to the given `id`.
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pub fn set_id(&mut self, id: impl Into<String>) {
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self.id = Cow::Owned(id.into());
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}
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/// Updates the origin id of the response to the given `origin_id`.
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pub fn set_origin_id(&mut self, origin_id: impl Into<String>) {
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self.origin_id = Cow::Owned(origin_id.into());
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}
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/// Allocates a new collection of bytes representing the response.
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pub fn to_bytes(&self) -> Vec<u8> {
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let mut bytes = vec![];
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let has_header = !header_is_empty(&self.header);
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if has_header {
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rmp::encode::write_array_len(&mut bytes, 4).unwrap();
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} else {
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rmp::encode::write_array_len(&mut bytes, 3).unwrap();
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}
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if has_header {
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bytes.extend_from_slice(&self.header);
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}
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rmp::encode::write_str(&mut bytes, &self.id).unwrap();
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rmp::encode::write_str(&mut bytes, &self.origin_id).unwrap();
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bytes.extend_from_slice(&self.payload);
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bytes
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}
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/// Parses a collection of bytes, returning an untyped response if it can be potentially
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/// represented as a [`Response`] depending on the payload.
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///
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/// NOTE: This supports parsing an invalid response where the payload would not properly
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/// deserialize, but the bytes themselves represent a complete response of some kind.
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pub fn from_slice(input: &'a [u8]) -> Result<Self, UntypedResponseParseError> {
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if input.is_empty() {
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return Err(UntypedResponseParseError::WrongType);
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}
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let has_header = match rmp::Marker::from_u8(input[0]) {
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rmp::Marker::FixArray(3) => false,
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rmp::Marker::FixArray(4) => true,
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_ => return Err(UntypedResponseParseError::WrongType),
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};
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// Advance position by marker
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let input = &input[1..];
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// Parse the header if we have one
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let (header, input) = if has_header {
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read_header_bytes(input).map_err(|_| UntypedResponseParseError::InvalidHeader)?
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} else {
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([0u8; 0].as_slice(), input)
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};
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let (id, input) =
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read_str_bytes(input).map_err(|_| UntypedResponseParseError::InvalidId)?;
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let (origin_id, input) =
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read_str_bytes(input).map_err(|_| UntypedResponseParseError::InvalidOriginId)?;
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// Check if we have input remaining, which should be our payload
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if input.is_empty() {
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return Err(UntypedResponseParseError::MissingPayload);
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}
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let header = Cow::Borrowed(header);
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let id = Cow::Borrowed(id);
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let origin_id = Cow::Borrowed(origin_id);
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let payload = Cow::Borrowed(input);
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Ok(Self {
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header,
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id,
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origin_id,
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payload,
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})
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}
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}
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#[cfg(test)]
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mod tests {
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use test_log::test;
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use super::*;
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const TRUE_BYTE: u8 = 0xc3;
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const NEVER_USED_BYTE: u8 = 0xc1;
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// fixmap of 2 objects with
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// 1. key fixstr "key" and value fixstr "value"
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// 1. key fixstr "num" and value fixint 123
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const HEADER_BYTES: &[u8] = &[
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0x82, // valid map with 2 pair
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0xa3, b'k', b'e', b'y', // key: "key"
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0xa5, b'v', b'a', b'l', b'u', b'e', // value: "value"
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0xa3, b'n', b'u', b'm', // key: "num"
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0x7b, // value: 123
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];
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/// fixstr of 4 bytes with str "test"
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const TEST_STR_BYTES: &[u8] = &[0xa4, b't', b'e', b's', b't'];
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#[test]
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fn untyped_response_should_support_converting_to_bytes() {
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let bytes = Response {
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header: header!(),
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id: "some id".to_string(),
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origin_id: "some origin id".to_string(),
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payload: true,
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}
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.to_vec()
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.unwrap();
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let untyped_response = UntypedResponse::from_slice(&bytes).unwrap();
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assert_eq!(untyped_response.to_bytes(), bytes);
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}
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#[test]
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fn untyped_response_should_support_converting_to_bytes_with_header() {
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let bytes = Response {
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header: header!("key" -> 123),
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id: "some id".to_string(),
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origin_id: "some origin id".to_string(),
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payload: true,
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}
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.to_vec()
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.unwrap();
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let untyped_response = UntypedResponse::from_slice(&bytes).unwrap();
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assert_eq!(untyped_response.to_bytes(), bytes);
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}
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|
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#[test]
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fn untyped_response_should_support_parsing_from_response_bytes_with_header() {
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let bytes = Response {
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header: header!("key" -> 123),
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id: "some id".to_string(),
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origin_id: "some origin id".to_string(),
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payload: true,
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}
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.to_vec()
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.unwrap();
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assert_eq!(
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UntypedResponse::from_slice(&bytes),
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Ok(UntypedResponse {
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header: Cow::Owned(utils::serialize_to_vec(&header!("key" -> 123)).unwrap()),
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id: Cow::Borrowed("some id"),
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origin_id: Cow::Borrowed("some origin id"),
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payload: Cow::Owned(vec![TRUE_BYTE]),
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})
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);
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}
|
|
|
|
#[test]
|
|
fn untyped_response_should_support_parsing_from_response_bytes_with_valid_payload() {
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let bytes = Response {
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header: header!(),
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id: "some id".to_string(),
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origin_id: "some origin id".to_string(),
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payload: true,
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}
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.to_vec()
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.unwrap();
|
|
|
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assert_eq!(
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UntypedResponse::from_slice(&bytes),
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Ok(UntypedResponse {
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header: Cow::Owned(vec![]),
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id: Cow::Borrowed("some id"),
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origin_id: Cow::Borrowed("some origin id"),
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payload: Cow::Owned(vec![TRUE_BYTE]),
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})
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);
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}
|
|
|
|
#[test]
|
|
fn untyped_response_should_support_parsing_from_response_bytes_with_invalid_payload() {
|
|
// Response with id < 32 bytes
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let mut bytes = Response {
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header: header!(),
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id: "".to_string(),
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origin_id: "".to_string(),
|
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payload: true,
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}
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.to_vec()
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.unwrap();
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|
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// Push never used byte in msgpack
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bytes.push(NEVER_USED_BYTE);
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|
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// We don't actually check for a valid payload, so the extra byte shows up
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assert_eq!(
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UntypedResponse::from_slice(&bytes),
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Ok(UntypedResponse {
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header: Cow::Owned(vec![]),
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id: Cow::Owned("".to_string()),
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origin_id: Cow::Owned("".to_string()),
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payload: Cow::Owned(vec![TRUE_BYTE, NEVER_USED_BYTE]),
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})
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);
|
|
}
|
|
|
|
#[test]
|
|
fn untyped_response_should_support_parsing_without_header() {
|
|
let input = [
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&[rmp::Marker::FixArray(3).to_u8()],
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TEST_STR_BYTES,
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|
&[0xa2, b'o', b'g'],
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&[TRUE_BYTE],
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]
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|
.concat();
|
|
|
|
// Convert into typed so we can test
|
|
let untyped_response = UntypedResponse::from_slice(&input).unwrap();
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let response: Response<bool> = untyped_response.to_typed_response().unwrap();
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|
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assert_eq!(response.header, header!());
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assert_eq!(response.id, "test");
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assert_eq!(response.origin_id, "og");
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assert!(response.payload);
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}
|
|
|
|
#[test]
|
|
fn untyped_response_should_support_parsing_full_request() {
|
|
let input = [
|
|
&[rmp::Marker::FixArray(4).to_u8()],
|
|
HEADER_BYTES,
|
|
TEST_STR_BYTES,
|
|
&[0xa2, b'o', b'g'],
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat();
|
|
|
|
// Convert into typed so we can test
|
|
let untyped_response = UntypedResponse::from_slice(&input).unwrap();
|
|
let response: Response<bool> = untyped_response.to_typed_response().unwrap();
|
|
|
|
assert_eq!(response.header, header!("key" -> "value", "num" -> 123));
|
|
assert_eq!(response.id, "test");
|
|
assert_eq!(response.origin_id, "og");
|
|
assert!(response.payload);
|
|
}
|
|
|
|
#[test]
|
|
fn untyped_response_should_fail_to_parse_if_given_bytes_not_representing_a_response() {
|
|
// Empty byte slice
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(&[]),
|
|
Err(UntypedResponseParseError::WrongType)
|
|
);
|
|
|
|
// Wrong starting byte
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(&[0x00]),
|
|
Err(UntypedResponseParseError::WrongType)
|
|
);
|
|
|
|
// Wrong starting byte (fixmap of 0 fields)
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(&[0x80]),
|
|
Err(UntypedResponseParseError::WrongType)
|
|
);
|
|
|
|
// Missing fields (corrupt data)
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(&[rmp::Marker::FixArray(3).to_u8()]),
|
|
Err(UntypedResponseParseError::InvalidId)
|
|
);
|
|
|
|
// Missing fields (corrupt data)
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(&[rmp::Marker::FixArray(4).to_u8()]),
|
|
Err(UntypedResponseParseError::InvalidHeader)
|
|
);
|
|
|
|
// Invalid header bytes
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(4).to_u8()],
|
|
&[0xa0], // header would be defined here, set to empty str
|
|
TEST_STR_BYTES,
|
|
TEST_STR_BYTES,
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::InvalidHeader)
|
|
);
|
|
|
|
// Non-str id field value
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(3).to_u8()],
|
|
&[TRUE_BYTE], // id value set to boolean
|
|
TEST_STR_BYTES,
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::InvalidId)
|
|
);
|
|
|
|
// Non-utf8 id field value
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(3).to_u8()] as &[u8],
|
|
&[0xa4, 0, 159, 146, 150],
|
|
TEST_STR_BYTES,
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::InvalidId)
|
|
);
|
|
|
|
// Non-str origin_id field value
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(3).to_u8()],
|
|
TEST_STR_BYTES,
|
|
&[TRUE_BYTE], // id value set to boolean
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::InvalidOriginId)
|
|
);
|
|
|
|
// Non-utf8 origin_id field value
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(3).to_u8()],
|
|
TEST_STR_BYTES,
|
|
&[0xa4, 0, 159, 146, 150],
|
|
&[TRUE_BYTE],
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::InvalidOriginId)
|
|
);
|
|
|
|
// Missing payload field (has valid data itself)
|
|
assert_eq!(
|
|
UntypedResponse::from_slice(
|
|
[
|
|
&[rmp::Marker::FixArray(3).to_u8()],
|
|
TEST_STR_BYTES,
|
|
TEST_STR_BYTES,
|
|
]
|
|
.concat()
|
|
.as_slice()
|
|
),
|
|
Err(UntypedResponseParseError::MissingPayload)
|
|
);
|
|
}
|
|
}
|