1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
#[macro_export]
macro_rules! prost_into_vec {
($(($type:ty, $cap:expr)),*) => {
$(impl std::convert::From<$type> for Vec<u8> {
fn from(msg: $type) -> Self {
let mut buf = bytes::BytesMut::with_capacity($cap);
msg.encode(&mut buf).unwrap();
buf.to_vec()
}
}
impl std::convert::From<&$type> for Vec<u8> {
fn from(msg: &$type) -> Self {
let mut buf = bytes::BytesMut::with_capacity($cap);
msg.encode(&mut buf).unwrap();
buf.to_vec()
}
})*
};
}
#[macro_export]
macro_rules! vec_try_into_prost {
($($type:ty),*) => {
$(impl std::convert::TryFrom<Vec<u8>> for $type {
type Error = prost::DecodeError;
fn try_from(buf: Vec<u8>) -> Result<Self, Self::Error> {
let msg: $type = Message::decode(&buf[..])?;
Ok(msg)
}
}
impl std::convert::TryFrom<&[u8]> for $type {
type Error = prost::DecodeError;
fn try_from(buf: &[u8]) -> Result<Self, Self::Error> {
let msg: $type = Message::decode(buf)?;
Ok(msg)
}
})*
};
}
#[cfg(feature = "json")]
#[macro_export]
macro_rules! prost_to_json {
($($type:ty),*) => {
$(impl ToJson for $type {
fn to_json(&self) -> String {
serde_json::to_string(self).unwrap()
}
})*
};
}
#[cfg(test)]
mod tests {
use prost::Message;
use serde::{Deserialize, Serialize};
use std::convert::TryInto;
#[derive(Clone, PartialEq, Message, Serialize, Deserialize)]
pub struct Hello {
#[prost(string, tag = "1")]
pub msg: String,
#[prost(uint64, tag = "2")]
pub value: u64,
}
#[derive(Clone, PartialEq, Message, Serialize, Deserialize)]
struct World {
#[prost(string, tag = "1")]
pub msg: String,
}
#[test]
fn test_prost_try_into_vec() {
prost_into_vec!((Hello, 32), (World, 256));
vec_try_into_prost!(Hello, World);
let hello = Hello::default();
let data: Vec<u8> = hello.clone().into();
let data_ref = &data[..];
let hello_result1: Result<Hello, prost::DecodeError> = data_ref.try_into();
let hello_result2: Result<Hello, prost::DecodeError> = data.try_into();
assert_eq!(hello_result1.is_ok(), true);
assert_eq!(hello_result1.unwrap(), hello);
assert_eq!(hello_result2.is_ok(), true);
assert_eq!(hello_result2.unwrap(), hello);
}
#[cfg(feature = "json")]
#[test]
fn test_prost_to_json() {
use crate::ToJson;
prost_to_json!(Hello, World);
let hello = Hello::default();
let result = hello.to_json();
assert_eq!(result, r#"{"msg":"","value":0}"#);
}
}