HashMap with valuable is represented as a string in when using JSON formatter

[banool]

Say I have code like this:

fn my_function() {
    let mut mymap: HashMap<String, String> = HashMap::new();
    mymap.insert("hey".to_string(), "friend".to_string());
    
    info!(mymap = tracing::field::valuable(&mymap), blah=2);
}

I'm using tracing_subscriber::fmt::layer().json().

The output looks like this:

{
  "timestamp": "2024-07-24T09:04:17.987349Z",
  "level": "INFO",
  "target": "aptos_api_gateway::http_proxy::http_handler",
  "mymap": "{\"hey\": \"friend\"}",
  "blah": 2
}

I was hoping that the HashMap would be represented as JSON within the top level JSON, but as you can see, it's just a string representation.

Is there any way to get the output to look like this?

{
  "timestamp": "2024-07-24T09:04:17.987349Z",
  "level": "INFO",
  "target": "aptos_api_gateway::http_proxy::http_handler",
  "mymap": {
    "hey": "friend"
  },
  "blah": 2
}

I have tried this instead:

#[derive(serde::Deserialize, serde::Serialize, valuable::Valuable)]
struct MyWrapper {
    mymap: HashMap<String, String>,
}

...

info!(mywrapper = tracing::field::valuable(&MyHeaders::new(headers)));

But I just get this:

"mywrapper":"MyWrapper { mymap: {\"hey\": \"friend\"} }"

[banool]

Linking back to the Discord thread: https://discord.com/channels/500028886025895936/819261130861051986/1265600592693166177.

[mladedav]

Are you using the unstable features and the valuable feature on tracing-subscriber?

[davidbarsky]

As @mladedav said, you are likely not enabling the unstable valuable feature on tracing-subscriber.

[banool]

Ah yes turns out that was it! I had the unstable feature enable but not the valuable feature on tracing-subscriber. Thanks all!