Struct trace_context::TraceContext

pub struct TraceContext { /* fields omitted */ }

A TraceContext object

Methods

impl TraceContext

pub fn extract(headers: &HeaderMap) -> Result<Self, ParseIntError>

Create and return TraceContext object based on traceparent HTTP header.

Examples

let mut headers = http::HeaderMap::new();
headers.insert("traceparent", "00-0af7651916cd43dd8448eb211c80319c-00f067aa0ba902b7-01".parse().unwrap());
 
let context = trace_context::TraceContext::extract(&headers).unwrap();
 
assert_eq!(context.trace_id(), u128::from_str_radix("0af7651916cd43dd8448eb211c80319c", 16).unwrap());
assert_eq!(context.parent_id(), u64::from_str_radix("00f067aa0ba902b7",
16).ok());
assert_eq!(context.sampled(), true);

pub fn new_root() -> Self

pub fn inject(&self, headers: &mut HeaderMap)

Add the traceparent header to the http headers

Examples

let mut input_headers = http::HeaderMap::new();
input_headers.insert("traceparent", "00-00000000000000000000000000000001-0000000000000002-01".parse().unwrap());

let parent = trace_context::TraceContext::extract(&input_headers).unwrap();

let mut output_headers = http::HeaderMap::new();
parent.inject(&mut output_headers);

let child = trace_context::TraceContext::extract(&output_headers).unwrap();

assert_eq!(child.version(), parent.version());
assert_eq!(child.trace_id(), parent.trace_id());
assert_eq!(child.parent_id(), Some(parent.id()));
assert_eq!(child.flags(), parent.flags());

pub fn child(&self) -> Self

pub fn id(&self) -> u64

pub fn version(&self) -> u8

pub fn trace_id(&self) -> u128

pub fn parent_id(&self) -> Option<u64>

pub fn flags(&self) -> u8

pub fn sampled(&self) -> bool

Returns true if the trace is sampled

Examples

let mut headers = http::HeaderMap::new();
headers.insert("traceparent", "00-00000000000000000000000000000001-0000000000000002-01".parse().unwrap());
let context = trace_context::TraceContext::extract(&headers).unwrap();
assert_eq!(context.sampled(), true);

pub fn set_sampled(&mut self, sampled: bool)

Change sampled flag

Examples

let mut context = trace_context::TraceContext::new_root();
assert_eq!(context.sampled(), true);
context.set_sampled(false);
assert_eq!(context.sampled(), false);

Trait Implementations

impl Debug for TraceContext

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

Formats the value using the given formatter.

impl Display for TraceContext

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

Formats the value using the given formatter.