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use crate::trace::{noop::NoopTracerProvider, SpanContext, Status};
use crate::InstrumentationLibrary;
use crate::{trace, trace::TracerProvider, Context, KeyValue};
use once_cell::sync::Lazy;
use std::borrow::Cow;
use std::fmt;
use std::mem;
use std::sync::{Arc, RwLock};
use std::time::SystemTime;
/// Allows a specific [`crate::trace::Span`] to be used generically by [`BoxedSpan`]
/// instances by mirroring the interface and boxing the return types.
pub trait ObjectSafeSpan {
/// An API to record events at a specific time in the context of a given `Span`.
///
/// Events SHOULD preserve the order in which they're set. This will typically match
/// the ordering of the events' timestamps.
///
/// Note that the OpenTelemetry project documents certain ["standard event names and
/// keys"](https://github.com/open-telemetry/opentelemetry-specification/tree/v0.5.0/specification/trace/semantic_conventions/README.md)
/// which have prescribed semantic meanings.
fn add_event_with_timestamp(
&mut self,
name: Cow<'static, str>,
timestamp: SystemTime,
attributes: Vec<KeyValue>,
);
/// Returns the `SpanContext` for the given `Span`. The returned value may be used even after
/// the `Span is finished. The returned value MUST be the same for the entire `Span` lifetime.
fn span_context(&self) -> &SpanContext;
/// Returns true if this `Span` is recording information like events with the `add_event`
/// operation, attributes using `set_attributes`, status with `set_status`, etc.
///
/// This flag SHOULD be used to avoid expensive computations of a `Span` attributes or events in
/// case when a `Span` is definitely not recorded. Note that any child span's recording is
/// determined independently from the value of this flag (typically based on the sampled flag of
/// a `TraceFlag` on `SpanContext`).
///
/// This flag may be true despite the entire trace being sampled out. This allows to record and
/// process information about the individual Span without sending it to the backend. An example
/// of this scenario may be recording and processing of all incoming requests for the processing
/// and building of SLA/SLO latency charts while sending only a subset - sampled spans - to the
/// backend. See also the sampling section of SDK design.
///
/// Users of the API should only access the `is_recording` property when instrumenting code and
/// never access `SampledFlag` unless used in context propagators.
fn is_recording(&self) -> bool;
/// An API to set a single `Attribute` where the attribute properties are passed
/// as arguments. To avoid extra allocations some implementations may offer a separate API for
/// each of the possible value types.
///
/// An `Attribute` is defined as a `KeyValue` pair.
///
/// Attributes SHOULD preserve the order in which they're set. Setting an attribute
/// with the same key as an existing attribute SHOULD overwrite the existing
/// attribute's value.
///
/// Note that the OpenTelemetry project documents certain ["standard
/// attributes"](https://github.com/open-telemetry/opentelemetry-specification/tree/v0.5.0/specification/trace/semantic_conventions/README.md)
/// that have prescribed semantic meanings.
fn set_attribute(&mut self, attribute: KeyValue);
/// Sets the status of the `Span`. `message` MUST be ignored when the status is `OK` or
/// `Unset`.
///
/// The order of status is `Ok` > `Error` > `Unset`. That's means set the status
/// to `Unset` will always be ignore, set the status to `Error` only works when current
/// status is `Unset`, set the status to `Ok` will be consider final and any further call
/// to this function will be ignore.
fn set_status(&mut self, status: Status);
/// Updates the `Span`'s name. After this update, any sampling behavior based on the
/// name will depend on the implementation.
///
/// It is highly discouraged to update the name of a `Span` after its creation.
/// `Span` name is often used to group, filter and identify the logical groups of
/// spans. Often, filtering logic will be implemented before the `Span` creation
/// for performance reasons, and the name update may interfere with this logic.
///
/// The method name is called `update_name` to differentiate this method from the
/// regular property. It emphasizes that this operation signifies a
/// major change for a `Span` and may lead to re-calculation of sampling or
/// filtering decisions made previously depending on the implementation.
fn update_name(&mut self, new_name: Cow<'static, str>);
/// Adds a link to this span
///
fn add_link(&mut self, span_context: SpanContext, attributes: Vec<KeyValue>);
/// Finishes the `Span`.
///
/// Implementations MUST ignore all subsequent calls to `end` (there might be
/// exceptions when the tracer is streaming events and has no mutable state
/// associated with the Span).
///
/// Calls to `end` a Span MUST not have any effects on child `Span`s as they may
/// still be running and can be ended later.
///
/// This API MUST be non-blocking.
fn end(&mut self) {
self.end_with_timestamp(crate::time::now());
}
/// Finishes the `Span` with given timestamp
///
/// For more details, refer to [`Span::end`]
///
/// [`Span::end`]: trace::Span::end
fn end_with_timestamp(&mut self, timestamp: SystemTime);
}
impl<T: trace::Span> ObjectSafeSpan for T {
fn add_event_with_timestamp(
&mut self,
name: Cow<'static, str>,
timestamp: SystemTime,
attributes: Vec<KeyValue>,
) {
self.add_event_with_timestamp(name, timestamp, attributes)
}
fn span_context(&self) -> &SpanContext {
self.span_context()
}
fn is_recording(&self) -> bool {
self.is_recording()
}
fn set_attribute(&mut self, attribute: KeyValue) {
self.set_attribute(attribute)
}
fn set_status(&mut self, status: Status) {
self.set_status(status)
}
fn update_name(&mut self, new_name: Cow<'static, str>) {
self.update_name(new_name)
}
fn add_link(&mut self, span_context: SpanContext, attributes: Vec<KeyValue>) {
self.add_link(span_context, attributes)
}
fn end_with_timestamp(&mut self, timestamp: SystemTime) {
self.end_with_timestamp(timestamp)
}
}
/// Wraps the [`BoxedTracer`]'s [`Span`] so it can be used generically by
/// applications without knowing the underlying type.
///
/// [`Span`]: crate::trace::Span
pub struct BoxedSpan(Box<dyn ObjectSafeSpan + Send + Sync>);
impl BoxedSpan {
pub(crate) fn new<T>(span: T) -> Self
where
T: ObjectSafeSpan + Send + Sync + 'static,
{
BoxedSpan(Box::new(span))
}
}
impl fmt::Debug for BoxedSpan {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("BoxedSpan")
}
}
impl trace::Span for BoxedSpan {
/// Records events at a specific time in the context of a given `Span`.
///
/// Note that the OpenTelemetry project documents certain ["standard event names and
/// keys"](https://github.com/open-telemetry/opentelemetry-specification/tree/v0.5.0/specification/trace/semantic_conventions/README.md)
/// which have prescribed semantic meanings.
fn add_event_with_timestamp<T>(
&mut self,
name: T,
timestamp: SystemTime,
attributes: Vec<KeyValue>,
) where
T: Into<Cow<'static, str>>,
{
self.0
.add_event_with_timestamp(name.into(), timestamp, attributes)
}
/// Returns the `SpanContext` for the given `Span`.
fn span_context(&self) -> &trace::SpanContext {
self.0.span_context()
}
/// Returns true if this `Span` is recording information like events with the `add_event`
/// operation, attributes using `set_attributes`, status with `set_status`, etc.
fn is_recording(&self) -> bool {
self.0.is_recording()
}
/// Sets a single `Attribute` where the attribute properties are passed as arguments.
///
/// Note that the OpenTelemetry project documents certain ["standard
/// attributes"](https://github.com/open-telemetry/opentelemetry-specification/tree/v0.5.0/specification/trace/semantic_conventions/README.md)
/// that have prescribed semantic meanings.
fn set_attribute(&mut self, attribute: KeyValue) {
self.0.set_attribute(attribute)
}
/// Sets the status of the `Span`. If used, this will override the default `Span`
/// status, which is `Unset`.
fn set_status(&mut self, status: trace::Status) {
self.0.set_status(status)
}
/// Updates the `Span`'s name.
fn update_name<T>(&mut self, new_name: T)
where
T: Into<Cow<'static, str>>,
{
self.0.update_name(new_name.into())
}
/// Adds a link to this span
///
fn add_link(&mut self, span_context: trace::SpanContext, attributes: Vec<KeyValue>) {
self.0.add_link(span_context, attributes)
}
/// Finishes the span with given timestamp.
fn end_with_timestamp(&mut self, timestamp: SystemTime) {
self.0.end_with_timestamp(timestamp);
}
}
/// Wraps the [`GlobalTracerProvider`]'s [`Tracer`] so it can be used generically by
/// applications without knowing the underlying type.
///
/// [`Tracer`]: crate::trace::Tracer
/// [`GlobalTracerProvider`]: crate::global::GlobalTracerProvider
pub struct BoxedTracer(Box<dyn ObjectSafeTracer + Send + Sync>);
impl BoxedTracer {
/// Create a `BoxedTracer` from an object-safe tracer.
pub fn new(tracer: Box<dyn ObjectSafeTracer + Send + Sync>) -> Self {
BoxedTracer(tracer)
}
}
impl fmt::Debug for BoxedTracer {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("BoxedTracer")
}
}
impl trace::Tracer for BoxedTracer {
/// Global tracer uses `BoxedSpan`s so that it can be a global singleton,
/// which is not possible if it takes generic type parameters.
type Span = BoxedSpan;
/// Create a span from a `SpanBuilder`
fn build_with_context(&self, builder: trace::SpanBuilder, parent_cx: &Context) -> Self::Span {
BoxedSpan(self.0.build_with_context_boxed(builder, parent_cx))
}
}
/// Allows a specific [`Tracer`] to be used generically by [`BoxedTracer`]
/// instances by mirroring the interface and boxing the return types.
///
/// [`Tracer`]: crate::trace::Tracer
pub trait ObjectSafeTracer {
/// Returns a trait object so the underlying implementation can be swapped
/// out at runtime.
fn build_with_context_boxed(
&self,
builder: trace::SpanBuilder,
parent_cx: &Context,
) -> Box<dyn ObjectSafeSpan + Send + Sync>;
}
impl<S, T> ObjectSafeTracer for T
where
S: trace::Span + Send + Sync + 'static,
T: trace::Tracer<Span = S>,
{
/// Returns a trait object so the underlying implementation can be swapped
/// out at runtime.
fn build_with_context_boxed(
&self,
builder: trace::SpanBuilder,
parent_cx: &Context,
) -> Box<dyn ObjectSafeSpan + Send + Sync> {
Box::new(self.build_with_context(builder, parent_cx))
}
}
/// Allows a specific [`TracerProvider`] to be used generically by the
/// [`GlobalTracerProvider`] by mirroring the interface and boxing the return types.
///
/// [`TracerProvider`]: crate::trace::TracerProvider
/// [`GlobalTracerProvider`]: crate::global::GlobalTracerProvider
pub trait ObjectSafeTracerProvider {
/// Creates a versioned named tracer instance that is a trait object through the underlying
/// `TracerProvider`.
fn boxed_tracer(
&self,
library: Arc<InstrumentationLibrary>,
) -> Box<dyn ObjectSafeTracer + Send + Sync>;
}
impl<S, T, P> ObjectSafeTracerProvider for P
where
S: trace::Span + Send + Sync + 'static,
T: trace::Tracer<Span = S> + Send + Sync + 'static,
P: trace::TracerProvider<Tracer = T>,
{
/// Return a versioned boxed tracer
fn boxed_tracer(
&self,
library: Arc<InstrumentationLibrary>,
) -> Box<dyn ObjectSafeTracer + Send + Sync> {
Box::new(self.library_tracer(library))
}
}
/// Represents the globally configured [`TracerProvider`] instance for this
/// application. This allows generic tracing through the returned
/// [`BoxedTracer`] instances.
///
/// [`TracerProvider`]: crate::trace::TracerProvider
#[derive(Clone)]
pub struct GlobalTracerProvider {
provider: Arc<dyn ObjectSafeTracerProvider + Send + Sync>,
}
impl fmt::Debug for GlobalTracerProvider {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("GlobalTracerProvider")
}
}
impl GlobalTracerProvider {
/// Create a new GlobalTracerProvider instance from a struct that implements `TracerProvider`.
fn new<P, T, S>(provider: P) -> Self
where
S: trace::Span + Send + Sync + 'static,
T: trace::Tracer<Span = S> + Send + Sync + 'static,
P: trace::TracerProvider<Tracer = T> + Send + Sync + 'static,
{
GlobalTracerProvider {
provider: Arc::new(provider),
}
}
}
impl trace::TracerProvider for GlobalTracerProvider {
type Tracer = BoxedTracer;
/// Create a tracer using the global provider.
fn library_tracer(&self, library: Arc<InstrumentationLibrary>) -> Self::Tracer {
BoxedTracer(self.provider.boxed_tracer(library))
}
}
/// The global `Tracer` provider singleton.
static GLOBAL_TRACER_PROVIDER: Lazy<RwLock<GlobalTracerProvider>> = Lazy::new(|| {
RwLock::new(GlobalTracerProvider::new(
trace::noop::NoopTracerProvider::new(),
))
});
/// Returns an instance of the currently configured global [`TracerProvider`] through
/// [`GlobalTracerProvider`].
///
/// [`TracerProvider`]: crate::trace::TracerProvider
/// [`GlobalTracerProvider`]: crate::global::GlobalTracerProvider
pub fn tracer_provider() -> GlobalTracerProvider {
GLOBAL_TRACER_PROVIDER
.read()
.expect("GLOBAL_TRACER_PROVIDER RwLock poisoned")
.clone()
}
/// Creates a named instance of [`Tracer`] via the configured [`GlobalTracerProvider`].
///
/// If the name is an empty string, the provider will use a default name.
///
/// This is a more convenient way of expressing `global::tracer_provider().tracer(name)`.
///
/// [`Tracer`]: crate::trace::Tracer
pub fn tracer(name: impl Into<Cow<'static, str>>) -> BoxedTracer {
tracer_provider().tracer(name.into())
}
/// Sets the given [`TracerProvider`] instance as the current global provider.
///
/// It returns the [`TracerProvider`] instance that was previously mounted as global provider
/// (e.g. [`NoopTracerProvider`] if a provider had not been set before).
///
/// [`TracerProvider`]: crate::trace::TracerProvider
pub fn set_tracer_provider<P, T, S>(new_provider: P) -> GlobalTracerProvider
where
S: trace::Span + Send + Sync + 'static,
T: trace::Tracer<Span = S> + Send + Sync + 'static,
P: trace::TracerProvider<Tracer = T> + Send + Sync + 'static,
{
let mut tracer_provider = GLOBAL_TRACER_PROVIDER
.write()
.expect("GLOBAL_TRACER_PROVIDER RwLock poisoned");
mem::replace(
&mut *tracer_provider,
GlobalTracerProvider::new(new_provider),
)
}
/// Shut down the current tracer provider. This will invoke the shutdown method on all span processors.
/// span processors should export remaining spans before return
pub fn shutdown_tracer_provider() {
let mut tracer_provider = GLOBAL_TRACER_PROVIDER
.write()
.expect("GLOBAL_TRACER_PROVIDER RwLock poisoned");
let _ = mem::replace(
&mut *tracer_provider,
GlobalTracerProvider::new(NoopTracerProvider::new()),
);
}