Struct Link 

pub struct Link {
    pub trace_id: Vec<u8>,
    pub span_id: Vec<u8>,
    pub trace_state: String,
    pub attributes: Vec<KeyValue>,
    pub dropped_attributes_count: u32,
    pub flags: u32,
}

A pointer from the current span to another span in the same trace or in a different trace. For example, this can be used in batching operations, where a single batch handler processes multiple requests from different traces or when the handler receives a request from a different project.

Fields

trace_id: Vec<u8>

A unique identifier of a trace that this linked span is part of. The ID is a 16-byte array.

span_id: Vec<u8>

A unique identifier for the linked span. The ID is an 8-byte array.

trace_state: String

The trace_state associated with the link.

attributes: Vec<KeyValue>

A collection of attribute key/value pairs on the link. Attribute keys MUST be unique (it is not allowed to have more than one attribute with the same key). The behavior of software that receives duplicated keys can be unpredictable.

dropped_attributes_count: u32

The number of dropped attributes. If the value is 0, then no attributes were dropped.

flags: u32

Flags, a bit field.

Bits 0-7 (8 least significant bits) are the trace flags as defined in W3C Trace Context specification. To read the 8-bit W3C trace flag, use flags & SPAN_FLAGS_TRACE_FLAGS_MASK.

See https://www.w3.org/TR/trace-context-2/#trace-flags for the flag definitions.

Bits 8 and 9 represent the 3 states of whether the link is remote. The states are (unknown, is not remote, is remote). To read whether the value is known, use (flags & SPAN_FLAGS_CONTEXT_HAS_IS_REMOTE_MASK) != 0. To read whether the link is remote, use (flags & SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK) != 0.

Readers MUST NOT assume that bits 10-31 (22 most significant bits) will be zero. When creating new spans, bits 10-31 (most-significant 22-bits) MUST be zero.

[Optional].

Trait Implementations

impl Clone for Link

fn clone(&self) -> Link

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Link

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Link

fn default() -> Self

Returns the “default value” for a type.

impl Message for Link

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for Link

fn eq(&self, other: &Link) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Link