Trait TraceField 

pub trait TraceField {
    // Required methods
    fn field_type() -> FieldType;
    fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>
       where W: Write;

    // Provided method
    fn is_optional() -> bool { ... }
}

Available on crate feature dial9 only.

Trait for types that can be used as trace fields. Provides schema metadata (field_type), encoding (encode), and

Required Methods

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

Encode this field’s value into the event encoder.

Provided Methods

fn is_optional() -> bool

Whether this field is optional on the wire (high-bit modifier).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl TraceField for &[u8]

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for &str

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for TaskId

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for WorkerId

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for bool

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for f64

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for i64

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for u8

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for u16

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for u32

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

impl TraceField for u64

fn field_type() -> FieldType

fn encode<W>(&self, enc: &mut EventEncoder<'_, W>) -> Result<(), Error>

where W: Write,

Implementors

impl TraceField for ApplicationProtocol

impl TraceField for BridgeCloseReason

impl TraceField for Domain

impl TraceField for Host

impl TraceField for InternedStackFrames

impl TraceField for InternedString

impl TraceField for rama::tls::boring::dial9::MaybeAlpnSelected

impl TraceField for rama::tls::rustls::dial9::MaybeAlpnSelected

impl TraceField for MaybeServerName

impl TraceField for ProtocolVersion

impl TraceField for StackFrames

impl TraceField for String

impl TraceField for Vec<(String, String)>

impl TraceField for Vec<u8>

impl<T> TraceField for Option<T>

where T: TraceField,

Blanket TraceField impl for Option<T> where T: TraceField.

On the wire, the field type tag has the high bit set (0x80 | inner_tag). Encoding writes 0x00 for None or 0x01 followed by the inner value for Some. Decoding maps FieldValueRef::None to None and delegates to the inner type for present values.