ErrJson: easy complex and intuitive Rust Error json
rust
use errjson::*;
fn myfnc() -> Result<i32, Box<dyn std::error::Error>> {
ErrJson!(code = "ERR001", message = "An error message")
}
return a valid Rust Error with a json stringify
json
{
"iserr":true,
"err":{
"code":"ERR001",
"message":"An error message"
}
}
You can also embed cascading errors and get a json that looks like this (full example code)
json
{
"meta": { "whoami": { "filename": "errjson/examples/full.rs", "function": "main", "line": 42 } },
"iserr": true,
"err": {
"code": "ERR0001",
"message": "Error when main() call myfnc()",
"origin": {
"meta": { "whoami": { "filename": "errjson/examples/full.rs", "function": "myfnc", "line": 26 } },
"iserr": true,
"err": {
"code": "ERR0002",
"message": "Error when myfnc() call mysubfnc()",
"origin": {
"meta": { "whoami": { "filename": "errjson/examples/full.rs", "function": "mysubfnc", "line": 11 } },
"iserr": true,
"err": {
"code": "ERR003",
"message": "Error when mysubfnc() call mysubsubfnc()",
"origin": "No such file or directory (os error 2)"
},
}
},
}
},
}
cargo run --example fullcargo run --example minimalWithout ErrJson, you can can write basic Err like this, but hard with a complex json, not normalize and difficult to embed 'caused' error.
Err(r#"{"error":"json", ...}"#);Err(serde_json::to_string(serde_json::json!({"error": "json", ...})));