Struct Trace 

pub struct Trace<T> { /* private fields */ }

Trillium handler that instruments per-request spans as per semantic conventions for http.

Implementations

impl<T: Tracer> Trace<T>

pub fn new(tracer: T) -> Self

Constructs a new Trace handler from a Tracer

pub fn with_route<F>(self, route: F) -> Self

where F: Fn(&Conn) -> Option<Cow<'static, str>> + Send + Sync + 'static,

provides a route specification to include in the trace spans.

in order to avoid forcing anyone to use a particular router, this is provided as a configuration hook.

for use with trillium-router,

use trillium_router::RouterConnExt;
trillium_opentelemetry::Metrics::new(&opentelemetry::global::meter("example"))
    .with_route(|conn| conn.route().map(|r| r.to_string().into()));

pub fn with_error_type<F>(self, error_type: F) -> Self

where F: Fn(&Conn) -> Option<Cow<'static, str>> + Send + Sync + 'static,

Provides an optional low-cardinality error type specification to include in the trace spans.

The implementation of this is application specific, but will often look like checking the [Conn::state] for an error enum and mapping that to a low-cardinality &'static str.

pub fn with_headers( self, headers: impl IntoIterator<Item = impl Into<HeaderName<'static>>>, ) -> Self

Specify a list of request headers to include in the trace spans

pub fn with_local_address_and_port(self) -> Self

Enable population of the local socket address and port in the trace spans.

This populates the network.local.address and network.local.port attributes.

Trait Implementations

impl<T: Clone> Clone for Trace<T>

fn clone(&self) -> Trace<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Span> Debug for Trace<Span>

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

Formats the value using the given formatter.

impl<T> Handler for Trace<T>

where T: Tracer + Send + Sync + 'static, T::Span: Send + Sync + 'static,

async fn init(&mut self, info: &mut Info)

Performs one-time async set up on a mutable borrow of the Handler before the server starts accepting requests. This allows a Handler to be defined in synchronous code but perform async setup such as establishing a database connection or fetching some state from an external source. This is optional, and chances are high that you do not need this.

async fn run(&self, conn: Conn) -> Conn

Executes this handler, performing any modifications to the Conn that are desired.

async fn before_send(&self, conn: Conn) -> Conn

Performs any final modifications to this conn after all handlers have been run. Although this is a slight deviation from the simple conn->conn->conn chain represented by most Handlers, it provides an easy way for libraries to effectively inject a second handler into a response chain. This is useful for loggers that need to record information both before and after other handlers have run, as well as database transaction handlers and similar library code.

fn has_upgrade(&self, upgrade: &Upgrade) -> bool

predicate function answering the question of whether this Handler would like to take ownership of the negotiated Upgrade. If this returns true, you must implement [Handler::upgrade]. The first handler that responds true to this will receive ownership of the [trillium::Upgrade][crate::Upgrade] in a subsequent call to [Handler::upgrade]

fn upgrade(&self, upgrade: Upgrade) -> impl Future<Output = ()> + Send

This will only be called if the handler reponds true to [Handler::has_upgrade] and will only be called once for this upgrade. There is no return value, and this function takes exclusive ownership of the underlying transport once this is called. You can downcast the transport to whatever the source transport type is and perform any non-http protocol communication that has been negotiated. You probably don’t want this unless you’re implementing something like websockets. Please note that for many transports such as TcpStreams, dropping the transport (and therefore the Upgrade) will hang up / disconnect.

fn name(&self) -> Cow<'static, str>

Customize the name of your handler. This is used in Debug implementations. The default is the type name of this handler.