devtools-core 0.3.6

CrabNebula devtools for Tauri: Inspect, monitor, and understand your application with ease.
Documentation 
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use devtools_wire_format::Field;
use std::fmt::Debug;
use tracing_subscriber::field::Visit;

/// A visitor that collects all fields from tracing events and spans.
pub struct FieldVisitor {
    meta_id: u64,
    /// A set of custom fields that provide additional data about the event.
    fields: Vec<Field>,
}

/// A visitor that collects metadata needed to construct a log event from a tracing event.
pub struct EventVisitor {
    field_visitor: FieldVisitor,
    /// The optional message associated with the event.
    message: Option<String>,
}

impl FieldVisitor {
    pub(crate) fn new(meta_id: u64) -> Self {
        Self {
            fields: Vec::default(),
            meta_id,
        }
    }
    pub(crate) fn result(self) -> Vec<Field> {
        self.fields
    }
}

impl EventVisitor {
    pub(crate) fn new(meta_id: u64) -> Self {
        Self {
            field_visitor: FieldVisitor::new(meta_id),
            message: None,
        }
    }
    pub(crate) fn result(self) -> (Option<String>, Vec<Field>) {
        (self.message, self.field_visitor.result())
    }
}

impl Visit for FieldVisitor {
    /// Visit a double-precision floating point value.
    fn record_f64(&mut self, field: &tracing_core::Field, value: f64) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }

    /// Visit a signed 64-bit integer value.
    fn record_i64(&mut self, field: &tracing_core::Field, value: i64) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }

    /// Visit an unsigned 64-bit integer value.
    fn record_u64(&mut self, field: &tracing_core::Field, value: u64) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }

    /// Visit a boolean value.
    fn record_bool(&mut self, field: &tracing_core::Field, value: bool) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }

    /// Visit a string value.
    fn record_str(&mut self, field: &tracing_core::Field, value: &str) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }

    fn record_debug(&mut self, field: &tracing_core::Field, value: &dyn Debug) {
        self.fields.push(Field {
            metadata_id: self.meta_id,
            name: field.name().into(),
            value: Some(value.into()),
        });
    }
}

impl Visit for EventVisitor {
    /// Visit a double-precision floating point value.
    fn record_f64(&mut self, field: &tracing_core::Field, value: f64) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(value.to_string()),
            _ => self.field_visitor.record_f64(field, value),
        }
    }

    /// Visit a signed 64-bit integer value.
    fn record_i64(&mut self, field: &tracing_core::Field, value: i64) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(value.to_string()),
            _ => self.field_visitor.record_i64(field, value),
        }
    }

    /// Visit an unsigned 64-bit integer value.
    fn record_u64(&mut self, field: &tracing_core::Field, value: u64) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(value.to_string()),
            _ => self.field_visitor.record_u64(field, value),
        }
    }

    /// Visit a boolean value.
    fn record_bool(&mut self, field: &tracing_core::Field, value: bool) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(value.to_string()),
            _ => self.field_visitor.record_bool(field, value),
        }
    }

    /// Visit a string value.
    fn record_str(&mut self, field: &tracing_core::Field, value: &str) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(value.to_string()),
            _ => self.field_visitor.record_str(field, value),
        }
    }

    fn record_debug(&mut self, field: &tracing_core::Field, value: &dyn Debug) {
        match field.name() {
            // skip fields that are `log` metadata that have already been handled
            "message" if self.message.is_none() => self.message = Some(format!("{value:?}")),
            _ => self.field_visitor.record_debug(field, value),
        }
    }
}