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85 lines
2.5 KiB
Rust
85 lines
2.5 KiB
Rust
4 years ago
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use serde::{Serialize, Deserialize};
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use crate::result::{VentedResult, VentedError};
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use byteorder::{BigEndian, ByteOrder, ReadBytesExt};
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use std::io::Read;
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use serde::de::DeserializeOwned;
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#[cfg(test)]
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mod tests;
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#[derive(Clone, Serialize, Deserialize)]
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pub struct EmptyPayload {}
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/// A single event that has a name and payload.
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/// The payload is encoded with message pack
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#[derive(Clone, Debug)]
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pub struct Event<T> {
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pub name: String,
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pub payload: T,
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}
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impl Event<EmptyPayload> {
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/// Creates a new Event with an empty payload
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pub fn new(name: String) -> Self {
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Self {
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name,
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payload: EmptyPayload {}
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}
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}
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}
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impl<T> Event<T> where T: Serialize + DeserializeOwned {
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/// Creates a new Event with a payload
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pub fn with_payload(name: String, payload: T) -> Self {
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Self {
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name,
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payload,
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}
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}
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4 years ago
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/// Returns the byte representation for the message
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/// the format is
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/// `name-length`: `u16`,
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/// `name`: `name-length`,
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/// `payload-length`: `u64`,
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/// `payload`: `payload-length`,
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pub fn to_bytes(&self) -> VentedResult<Vec<u8>> {
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let mut payload_raw = rmp_serde::to_vec(&self.payload)?;
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4 years ago
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let mut name_raw = self.name.as_bytes().to_vec();
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4 years ago
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let name_length = name_raw.len();
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let mut name_length_raw = [0u8; 2];
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BigEndian::write_u16(&mut name_length_raw, name_length as u16);
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let payload_length = payload_raw.len();
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let mut payload_length_raw = [0u8; 8];
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BigEndian::write_u64(&mut payload_length_raw, payload_length as u64);
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let mut data = Vec::new();
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data.append(&mut name_length_raw.to_vec());
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data.append(&mut name_raw);
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data.append(&mut payload_length_raw.to_vec());
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data.append(&mut payload_raw);
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Ok(data)
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}
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/// Deserializes the message from bytes that can be read from the given reader
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/// The result will be the Message with the specific message payload type
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pub fn from_bytes<R: Read>(bytes: &mut R) -> VentedResult<Self> {
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let name_length = bytes.read_u16::<BigEndian>()?;
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let mut name_buf = vec![0u8; name_length as usize];
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bytes.read_exact(&mut name_buf)?;
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let event_name = String::from_utf8(name_buf).map_err(|_| VentedError::NameDecodingError)?;
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let payload_length = bytes.read_u64::<BigEndian>()?;
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let payload = rmp_serde::from_read(bytes.take(payload_length))?;
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Ok(Self {
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name: event_name,
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4 years ago
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payload,
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})
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}
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}
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