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,
}

Available on crate features gen-tonic-messages and trace only.

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>

attributes is 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).

dropped_attributes_count: u32

dropped_attributes_count is 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 copy 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<'de> Deserialize<'de> for Link

where Link: Default,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<Link> for Link

fn from(link: Link) -> Self

Converts to this type from the input 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 Serialize for Link

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Link