Vincent Herlemont
70 lines
1.9 KiB
Rust
70 lines
1.9 KiB
Rust
use bincode;
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use bincode::{config, Decode, Encode};
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use native_model::native_model;
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pub struct Bincode;
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impl<T: bincode::Encode> native_model::Encode<T> for Bincode {
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type Error = bincode::error::EncodeError;
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fn encode(obj: &T) -> Result<Vec<u8>, bincode::error::EncodeError> {
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bincode::encode_to_vec(obj, config::standard())
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}
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}
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impl<T: bincode::Decode> native_model::Decode<T> for Bincode {
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type Error = bincode::error::DecodeError;
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fn decode(data: Vec<u8>) -> Result<T, bincode::error::DecodeError> {
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bincode::decode_from_slice(&data, config::standard()).map(|(result, _)| result)
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}
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}
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#[derive(Encode, Decode, PartialEq, Debug)]
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#[native_model(id = 1, version = 1, with = Bincode)]
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struct DotV1(u32, u32);
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#[derive(Encode, Decode, PartialEq, Debug)]
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#[native_model(id = 1, version = 2, with = Bincode, from = DotV1)]
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struct DotV2 {
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name: String,
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x: u64,
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y: u64,
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}
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impl From<DotV1> for DotV2 {
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fn from(dot: DotV1) -> Self {
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DotV2 {
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name: "".to_string(),
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x: dot.0 as u64,
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y: dot.1 as u64,
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}
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}
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}
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impl From<DotV2> for DotV1 {
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fn from(dot: DotV2) -> Self {
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DotV1(dot.x as u32, dot.y as u32)
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}
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}
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#[test]
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fn run_example() {
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// Application 1
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let dot = DotV1(1, 2);
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let bytes = native_model::encode(&dot).unwrap();
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// Application 1 sends bytes to Application 2.
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// Application 2
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let (mut dot, source_version) = native_model::decode::<DotV2>(bytes).unwrap();
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// Use the struct DataV2 which has more fields and a different structure.
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dot.name = "Dot".to_string();
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dot.x = 5;
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// Encode the dot with the application 1 version in order to be compatible with it.
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let bytes = native_model::encode_downgrade(dot, source_version).unwrap();
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// Application 2 sends bytes to Application 1.
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// Application 1
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let (dot, _) = native_model::decode::<DotV1>(bytes).unwrap();
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assert_eq!(dot, DotV1(5, 2));
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}
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