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@ -5,12 +5,17 @@ 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::{parse_msg_pack_str, write_str_msg_pack, Id};
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use super::{read_header_bytes, read_key_eq, 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, Hash, Serialize, Deserialize)]
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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pub struct Response<T> {
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/// Optional header data to include with response
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#[serde(default, skip_serializing_if = "Header::is_empty")]
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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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@ -22,9 +27,10 @@ pub struct Response<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
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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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@ -49,6 +55,11 @@ where
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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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utils::serialize_to_vec(&self.header)?
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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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@ -72,16 +83,40 @@ 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 key is wrong
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InvalidHeaderKey,
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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 key for the id is wrong
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InvalidIdKey,
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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 key for the origin id is wrong
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InvalidOriginIdKey,
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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 the key for the payload is wrong
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InvalidPayloadKey,
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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, serde::Serialize, serde::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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@ -93,9 +128,14 @@ pub struct UntypedResponse<'a> {
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}
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impl<'a> UntypedResponse<'a> {
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/// Attempts to convert an untyped request to a typed request
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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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utils::deserialize_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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@ -105,6 +145,10 @@ impl<'a> UntypedResponse<'a> {
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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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@ -123,6 +167,10 @@ impl<'a> UntypedResponse<'a> {
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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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@ -138,6 +186,11 @@ impl<'a> UntypedResponse<'a> {
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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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@ -150,76 +203,90 @@ impl<'a> UntypedResponse<'a> {
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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![0x83];
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let mut bytes = vec![];
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write_str_msg_pack("id", &mut bytes);
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write_str_msg_pack(&self.id, &mut bytes);
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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_map_len(&mut bytes, 4).unwrap();
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} else {
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rmp::encode::write_map_len(&mut bytes, 3).unwrap();
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}
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write_str_msg_pack("origin_id", &mut bytes);
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write_str_msg_pack(&self.origin_id, &mut bytes);
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if has_header {
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rmp::encode::write_str(&mut bytes, "header").unwrap();
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bytes.extend_from_slice(&self.header);
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}
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write_str_msg_pack("payload", &mut bytes);
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rmp::encode::write_str(&mut bytes, "id").unwrap();
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rmp::encode::write_str(&mut bytes, &self.id).unwrap();
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rmp::encode::write_str(&mut bytes, "origin_id").unwrap();
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rmp::encode::write_str(&mut bytes, &self.origin_id).unwrap();
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rmp::encode::write_str(&mut bytes, "payload").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, or the original bytes if it does not
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/// represent a [`Response`].
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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.len() < 2 {
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if input.is_empty() {
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return Err(UntypedResponseParseError::WrongType);
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}
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// MsgPack marks a fixmap using 0x80 - 0x8f to indicate the size (up to 15 elements).
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//
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// In the case of the request, there are only three elements: id, origin_id, and payload.
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// So the first byte should ALWAYS be 0x83 (131).
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if input[0] != 0x83 {
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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::FixMap(3) => false,
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rmp::Marker::FixMap(4) => true,
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_ => return Err(UntypedResponseParseError::WrongType),
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};
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// Skip the first byte representing the fixmap
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// Advance position by marker
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let input = &input[1..];
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// Validate that first field is id
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let (input, id_key) =
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parse_msg_pack_str(input).map_err(|_| UntypedResponseParseError::WrongType)?;
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if id_key != "id" {
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return Err(UntypedResponseParseError::WrongType);
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}
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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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let (_, input) = read_key_eq(input, "header")
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.map_err(|_| UntypedResponseParseError::InvalidHeaderKey)?;
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let (header, input) =
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read_header_bytes(input).map_err(|_| UntypedResponseParseError::InvalidHeader)?;
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(header, input)
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} else {
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([0u8; 0].as_slice(), input)
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};
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// Validate that next field is id
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let (_, input) =
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read_key_eq(input, "id").map_err(|_| UntypedResponseParseError::InvalidIdKey)?;
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// Get the id itself
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let (input, id) =
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parse_msg_pack_str(input).map_err(|_| UntypedResponseParseError::InvalidId)?;
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let (id, input) =
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read_str_bytes(input).map_err(|_| UntypedResponseParseError::InvalidId)?;
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// Validate that second field is origin_id
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let (input, origin_id_key) =
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parse_msg_pack_str(input).map_err(|_| UntypedResponseParseError::WrongType)?;
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if origin_id_key != "origin_id" {
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return Err(UntypedResponseParseError::WrongType);
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}
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// Validate that next field is origin_id
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let (_, input) = read_key_eq(input, "origin_id")
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.map_err(|_| UntypedResponseParseError::InvalidOriginIdKey)?;
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// Get the origin_id itself
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let (input, origin_id) =
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parse_msg_pack_str(input).map_err(|_| UntypedResponseParseError::InvalidOriginId)?;
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let (origin_id, input) =
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read_str_bytes(input).map_err(|_| UntypedResponseParseError::InvalidOriginId)?;
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// Validate that second field is payload
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let (input, payload_key) =
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parse_msg_pack_str(input).map_err(|_| UntypedResponseParseError::WrongType)?;
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if payload_key != "payload" {
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return Err(UntypedResponseParseError::WrongType);
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}
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// Validate that final field is payload
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let (_, input) = read_key_eq(input, "payload")
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.map_err(|_| UntypedResponseParseError::InvalidPayloadKey)?;
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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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@ -236,22 +303,52 @@ mod tests {
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const TRUE_BYTE: u8 = 0xc3;
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const NEVER_USED_BYTE: u8 = 0xc1;
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// fixstr of 6 bytes with str "header"
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const HEADER_FIELD_BYTES: &[u8] = &[0xa6, b'h', b'e', b'a', b'd', b'e', b'r'];
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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 2 bytes with str "id"
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const ID_FIELD_BYTES: &[u8] = &[0xa2, 0x69, 0x64];
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const ID_FIELD_BYTES: &[u8] = &[0xa2, b'i', b'd'];
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// fixstr of 9 bytes with str "origin_id"
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const ORIGIN_ID_FIELD_BYTES: &[u8] =
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&[0xa9, 0x6f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x5f, 0x69, 0x64];
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// fixstr of 7 bytes with str "payload"
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const PAYLOAD_FIELD_BYTES: &[u8] = &[0xa7, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64];
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const PAYLOAD_FIELD_BYTES: &[u8] = &[0xa7, b'p', b'a', b'y', b'l', b'o', b'a', b'd'];
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/// fixstr of 4 bytes with str "test"
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const TEST_STR_BYTES: &[u8] = &[0xa4, 0x74, 0x65, 0x73, 0x74];
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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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@ -263,9 +360,32 @@ mod tests {
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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_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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|
);
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}
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|
#[test]
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|
|
|
fn untyped_response_should_support_parsing_from_response_bytes_with_valid_payload() {
|
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|
|
|
let bytes = Response {
|
|
|
|
|
header: header!(),
|
|
|
|
|
id: "some id".to_string(),
|
|
|
|
|
origin_id: "some origin id".to_string(),
|
|
|
|
|
payload: true,
|
|
|
|
@ -276,6 +396,7 @@ mod tests {
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|
|
|
assert_eq!(
|
|
|
|
|
UntypedResponse::from_slice(&bytes),
|
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|
|
|
Ok(UntypedResponse {
|
|
|
|
|
header: Cow::Owned(vec![]),
|
|
|
|
|
id: Cow::Borrowed("some id"),
|
|
|
|
|
origin_id: Cow::Borrowed("some origin id"),
|
|
|
|
|
payload: Cow::Owned(vec![TRUE_BYTE]),
|
|
|
|
@ -287,6 +408,7 @@ mod tests {
|
|
|
|
|
fn untyped_response_should_support_parsing_from_response_bytes_with_invalid_payload() {
|
|
|
|
|
// Response with id < 32 bytes
|
|
|
|
|
let mut bytes = Response {
|
|
|
|
|
header: header!(),
|
|
|
|
|
id: "".to_string(),
|
|
|
|
|
origin_id: "".to_string(),
|
|
|
|
|
payload: true,
|
|
|
|
@ -301,6 +423,7 @@ mod tests {
|
|
|
|
|
assert_eq!(
|
|
|
|
|
UntypedResponse::from_slice(&bytes),
|
|
|
|
|
Ok(UntypedResponse {
|
|
|
|
|
header: Cow::Owned(vec![]),
|
|
|
|
|
id: Cow::Owned("".to_string()),
|
|
|
|
|
origin_id: Cow::Owned("".to_string()),
|
|
|
|
|
payload: Cow::Owned(vec![TRUE_BYTE, NEVER_USED_BYTE]),
|
|
|
|
@ -308,6 +431,31 @@ mod tests {
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
|
fn untyped_response_should_support_parsing_full_request() {
|
|
|
|
|
let input = [
|
|
|
|
|
&[0x84],
|
|
|
|
|
HEADER_FIELD_BYTES,
|
|
|
|
|
HEADER_BYTES,
|
|
|
|
|
ID_FIELD_BYTES,
|
|
|
|
|
TEST_STR_BYTES,
|
|
|
|
|
ORIGIN_ID_FIELD_BYTES,
|
|
|
|
|
&[0xa2, b'o', b'g'],
|
|
|
|
|
PAYLOAD_FIELD_BYTES,
|
|
|
|
|
&[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
|
|
|
|
@ -328,10 +476,50 @@ mod tests {
|
|
|
|
|
Err(UntypedResponseParseError::WrongType)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Invalid header key
|
|
|
|
|
assert_eq!(
|
|
|
|
|
UntypedResponse::from_slice(
|
|
|
|
|
[
|
|
|
|
|
&[0x84],
|
|
|
|
|
&[0xa0], // header key would be defined here, set to empty str
|
|
|
|
|
HEADER_BYTES,
|
|
|
|
|
ID_FIELD_BYTES,
|
|
|
|
|
TEST_STR_BYTES,
|
|
|
|
|
ORIGIN_ID_FIELD_BYTES,
|
|
|
|
|
TEST_STR_BYTES,
|
|
|
|
|
PAYLOAD_FIELD_BYTES,
|
|
|
|
|
&[TRUE_BYTE],
|
|
|
|
|
]
|
|
|
|
|
.concat()
|
|
|
|
|
.as_slice()
|
|
|
|
|
),
|
|
|
|
|
Err(UntypedResponseParseError::InvalidHeaderKey)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Invalid header bytes
|
|
|
|
|
assert_eq!(
|
|
|
|
|
UntypedResponse::from_slice(
|
|
|
|
|
[
|
|
|
|
|
&[0x84],
|
|
|
|
|
HEADER_FIELD_BYTES,
|
|
|
|
|
&[0xa0], // header would be defined here, set to empty str
|
|
|
|
|
ID_FIELD_BYTES,
|
|
|
|
|
TEST_STR_BYTES,
|
|
|
|
|
ORIGIN_ID_FIELD_BYTES,
|
|
|
|
|
TEST_STR_BYTES,
|
|
|
|
|
PAYLOAD_FIELD_BYTES,
|
|
|
|
|
&[TRUE_BYTE],
|
|
|
|
|
]
|
|
|
|
|
.concat()
|
|
|
|
|
.as_slice()
|
|
|
|
|
),
|
|
|
|
|
Err(UntypedResponseParseError::InvalidHeader)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Missing fields (corrupt data)
|
|
|
|
|
assert_eq!(
|
|
|
|
|
UntypedResponse::from_slice(&[0x83]),
|
|
|
|
|
Err(UntypedResponseParseError::WrongType)
|
|
|
|
|
Err(UntypedResponseParseError::InvalidIdKey)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Missing id field (has valid data itself)
|
|
|
|
@ -349,7 +537,7 @@ mod tests {
|
|
|
|
|
.concat()
|
|
|
|
|
.as_slice()
|
|
|
|
|
),
|
|
|
|
|
Err(UntypedResponseParseError::WrongType)
|
|
|
|
|
Err(UntypedResponseParseError::InvalidIdKey)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Non-str id field value
|
|
|
|
@ -403,7 +591,7 @@ mod tests {
|
|
|
|
|
.concat()
|
|
|
|
|
.as_slice()
|
|
|
|
|
),
|
|
|
|
|
Err(UntypedResponseParseError::WrongType)
|
|
|
|
|
Err(UntypedResponseParseError::InvalidOriginIdKey)
|
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
// Non-str origin_id field value
|
|
|
|
@ -457,7 +645,7 @@ mod tests {
|
|
|
|
|
.concat()
|
|
|
|
|
.as_slice()
|
|
|
|
|
),
|
|
|
|
|
Err(UntypedResponseParseError::WrongType)
|
|
|
|
|
Err(UntypedResponseParseError::InvalidPayloadKey)
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|