tracing-ndjson 0.3.0

A customizable ndjson formatter for outputting tracing events
Documentation 
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use std::collections::BTreeMap;
use std::fmt;

use tracing_core::{Field, field::Visit};

#[derive(Debug, Default)]
pub(crate) struct JsonStorage<'a> {
    pub(crate) values: BTreeMap<&'a str, serde_json::Value>,
}

impl<'a> JsonStorage<'a> {
    pub(crate) fn values(&self) -> &BTreeMap<&'a str, serde_json::Value> {
        &self.values
    }
}

impl Visit for JsonStorage<'_> {
    /// Visit a signed 64-bit integer value.
    fn record_i64(&mut self, field: &Field, value: i64) {
        self.values
            .insert(field.name(), serde_json::Value::from(value));
    }

    /// Visit an unsigned 64-bit integer value.
    fn record_u64(&mut self, field: &Field, value: u64) {
        self.values
            .insert(field.name(), serde_json::Value::from(value));
    }

    /// Visit a 64-bit floating point value.
    fn record_f64(&mut self, field: &Field, value: f64) {
        self.values
            .insert(field.name(), serde_json::Value::from(value));
    }

    /// Visit a boolean value.
    fn record_bool(&mut self, field: &Field, value: bool) {
        self.values
            .insert(field.name(), serde_json::Value::from(value));
    }

    /// Visit a string value.
    fn record_str(&mut self, field: &Field, value: &str) {
        self.values
            .insert(field.name(), serde_json::Value::from(value));
    }

    fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
        match field.name() {
            // Skip fields that are actually log metadata that have already been handled
            name if name.starts_with("log.") => (),
            name if name.starts_with("r#") => {
                self.values
                    .insert(&name[2..], serde_json::Value::from(format!("{:?}", value)));
            }
            name => {
                self.values
                    .insert(name, serde_json::Value::from(format!("{:?}", value)));
            }
        };
    }
}