pub struct TraceState(/* private fields */);
Expand description

TraceState carries system-specific configuration data, represented as a list of key-value pairs. TraceState allows multiple tracing systems to participate in the same trace.

Please review the W3C specification for details on this field.

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impl TraceState

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pub fn from_key_value<T, K, V>(trace_state: T) -> TraceResult<Self>where T: IntoIterator<Item = (K, V)>, K: ToString, V: ToString,

Creates a new TraceState from the given key-value collection.

Examples
use opentelemetry_api::trace::TraceState;

let kvs = vec![("foo", "bar"), ("apple", "banana")];
let trace_state = TraceState::from_key_value(kvs);

assert!(trace_state.is_ok());
assert_eq!(trace_state.unwrap().header(), String::from("foo=bar,apple=banana"))
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pub fn get(&self, key: &str) -> Option<&str>

Retrieves a value for a given key from the TraceState if it exists.

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pub fn insert<K, V>(&self, key: K, value: V) -> TraceResult<TraceState>where K: Into<String>, V: Into<String>,

Inserts the given key-value pair into the TraceState. If a value already exists for the given key, this updates the value and updates the value’s position. If the key or value are invalid per the W3 Spec an Err is returned, else a new TraceState with the updated key/value is returned.

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pub fn delete<K: Into<String>>(&self, key: K) -> TraceResult<TraceState>

Removes the given key-value pair from the TraceState. If the key is invalid per the W3 Spec an Err is returned. Else, a new TraceState with the removed entry is returned.

If the key is not in TraceState. The original TraceState will be cloned and returned.

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pub fn header(&self) -> String

Creates a new TraceState header string, delimiting each key and value with a = and each entry with a ,.

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pub fn header_delimited( &self, entry_delimiter: &str, list_delimiter: &str ) -> String

Creates a new TraceState header string, with the given key/value delimiter and entry delimiter.

Trait Implementations§

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impl Clone for TraceState

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fn clone(&self) -> TraceState

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TraceState

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

Formats the value using the given formatter. Read more
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impl Default for TraceState

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fn default() -> TraceState

Returns the “default value” for a type. Read more
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impl FromStr for TraceState

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type Err = TraceError

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for TraceState

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for TraceState

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for TraceState

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impl StructuralEq for TraceState

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impl StructuralPartialEq for TraceState

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FutureExt for T

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fn with_context(self, otel_cx: Context) -> WithContext<Self>

Attaches the provided Context to this type, returning a WithContext wrapper. Read more
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fn with_current_context(self) -> WithContext<Self>

Attaches the current Context to this type, returning a WithContext wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.