{-# LANGUAGE BangPatterns #-} {-# LANGUAGE DataKinds #-} {-# LANGUAGE LambdaCase #-} {-# LANGUAGE NumericUnderscores #-} {-# LANGUAGE OverloadedLists #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE TypeApplications #-} {-# LANGUAGE TypeFamilies #-} ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- {- | Module : OpenTelemetry.Trace.Core Copyright : (c) Ian Duncan, 2021 License : BSD-3 Description : Low-level tracing API Maintainer : Ian Duncan Stability : experimental Portability : non-portable (GHC extensions) Traces track the progression of a single request, called a trace, as it is handled by services that make up an application. The request may be initiated by a user or an application. Distributed tracing is a form of tracing that traverses process, network and security boundaries. Each unit of work in a trace is called a span; a trace is a tree of spans. Spans are objects that represent the work being done by individual services or components involved in a request as it flows through a system. A span contains a span context, which is a set of globally unique identifiers that represent the unique request that each span is a part of. A span provides Request, Error and Duration (RED) metrics that can be used to debug availability as well as performance issues. A trace contains a single root span which encapsulates the end-to-end latency for the entire request. You can think of this as a single logical operation, such as clicking a button in a web application to add a product to a shopping cart. The root span would measure the time it took from an end-user clicking that button to the operation being completed or failing (so, the item is added to the cart or some error occurs) and the result being displayed to the user. A trace is comprised of the single root span and any number of child spans, which represent operations taking place as part of the request. Each span contains metadata about the operation, such as its name, start and end timestamps, attributes, events, and status. To create and manage 'Span's in OpenTelemetry, the provides the tracer interface. This object is responsible for tracking the active span in your process, and allows you to access the current span in order to perform operations on it such as adding attributes, events, and finishing it when the work it tracks is complete. One or more tracer objects can be created in a process through the tracer provider, a factory interface that allows for multiple 'Tracer's to be instantiated in a single process with different options. Generally, the lifecycle of a span resembles the following: A request is received by a service. The span context is extracted from the request headers, if it exists. A new span is created as a child of the extracted span context; if none exists, a new root span is created. The service handles the request. Additional attributes and events are added to the span that are useful for understanding the context of the request, such as the hostname of the machine handling the request, or customer identifiers. New spans may be created to represent work being done by sub-components of the service. When the service makes a remote call to another service, the current span context is serialized and forwarded to the next service by injecting the span context into the headers or message envelope. The work being done by the service completes, successfully or not. The span status is appropriately set, and the span is marked finished. For more information, see the traces specification, which covers concepts including: trace, span, parent/child relationship, span context, attributes, events and links. This module implements eveything required to conform to the trace & span public interface described by the OpenTelemetry specification. See OpenTelemetry.Trace.Monad for an implementation that's generally easier to use in idiomatic Haskell. -} module OpenTelemetry.Trace.Core ( -- * @TracerProvider@ operations TracerProvider, createTracerProvider, shutdownTracerProvider, forceFlushTracerProvider, getTracerProviderResources, getTracerProviderPropagators, getGlobalTracerProvider, setGlobalTracerProvider, emptyTracerProviderOptions, TracerProviderOptions (..), -- * @Tracer@ operations Tracer, tracerName, HasTracer (..), makeTracer, getTracer, getImmutableSpanTracer, getTracerTracerProvider, InstrumentationLibrary (..), TracerOptions (..), tracerOptions, -- * Span operations Span, ImmutableSpan (..), SpanContext (..), -- | W3c Trace flags -- -- https://www.w3.org/TR/trace-context/#trace-flags TraceFlags, traceFlagsValue, traceFlagsFromWord8, defaultTraceFlags, isSampled, setSampled, unsetSampled, -- ** Creating @Span@s inSpan, inSpan', inSpan'', createSpan, createSpanWithoutCallStack, wrapSpanContext, SpanKind (..), defaultSpanArguments, SpanArguments (..), NewLink (..), Link (..), -- ** Recording @Event@s Event (..), NewEvent (..), addEvent, -- ** Enriching @Span@s with additional information updateName, OpenTelemetry.Trace.Core.addAttribute, OpenTelemetry.Trace.Core.addAttributes, spanGetAttributes, Attribute (..), ToAttribute (..), PrimitiveAttribute (..), ToPrimitiveAttribute (..), -- ** Recording error information recordException, setStatus, SpanStatus (..), -- ** Completing @Span@s endSpan, -- ** Accessing other @Span@ information getSpanContext, isRecording, isValid, spanIsRemote, -- * Utilities Timestamp, getTimestamp, timestampNanoseconds, unsafeReadSpan, whenSpanIsRecording, ownCodeAttributes, callerAttributes, addAttributesToSpanArguments, -- * Limits SpanLimits (..), defaultSpanLimits, bracketError, ) where import Control.Applicative import Control.Concurrent (myThreadId) import Control.Concurrent.Async import Control.Exception (Exception (..), SomeException (..), try) import Control.Monad import Control.Monad.IO.Class import Control.Monad.IO.Unlift import Data.Coerce import qualified Data.HashMap.Strict as H import Data.IORef import Data.Maybe (fromMaybe, isJust, isNothing) import Data.Text (Text) import qualified Data.Text as T import Data.Typeable import qualified Data.Vector as V import Data.Word (Word64) import GHC.Stack import Network.HTTP.Types import OpenTelemetry.Attributes import qualified OpenTelemetry.Attributes as A import OpenTelemetry.Common import OpenTelemetry.Context import OpenTelemetry.Context.ThreadLocal import OpenTelemetry.Internal.Trace.Types import qualified OpenTelemetry.Internal.Trace.Types as Types import OpenTelemetry.Logging.Core (Log) import OpenTelemetry.Propagator (Propagator) import OpenTelemetry.Resource import OpenTelemetry.Trace.Id import OpenTelemetry.Trace.Id.Generator import OpenTelemetry.Trace.Id.Generator.Dummy import OpenTelemetry.Trace.Sampler import qualified OpenTelemetry.Trace.TraceState as TraceState import OpenTelemetry.Util import System.Clock import System.IO.Unsafe import System.Timeout (timeout) {- | Create a 'Span'. If the provided 'Context' has a span in it (inserted via 'OpenTelemetry.Context.insertSpan'), that 'Span' will be used as the parent of the 'Span' created via this API. Note: if the @hs-opentelemetry-sdk@ or another SDK is not installed, all actions that use the created 'Span's produced will be no-ops. @since 0.0.1.0 -} createSpan :: (MonadIO m, HasCallStack) => Tracer -- ^ 'Tracer' to create the span from. Associated 'Processor's and 'Exporter's will be -- used for the lifecycle of the created 'Span' -> Context -- ^ Context, potentially containing a parent span. If no existing parent (or context) exists, -- you can use 'OpenTelemetry.Context.empty'. -> Text -- ^ Span name -> SpanArguments -- ^ Additional span information -> m Span -- ^ The created span. createSpan t ctxt n args = createSpanWithoutCallStack t ctxt n (args {attributes = H.union (attributes args) callerAttributes}) -- | The same thing as 'createSpan', except that it does not have a 'HasCallStack' constraint. createSpanWithoutCallStack :: (MonadIO m) => Tracer -- ^ 'Tracer' to create the span from. Associated 'Processor's and 'Exporter's will be -- used for the lifecycle of the created 'Span' -> Context -- ^ Context, potentially containing a parent span. If no existing parent (or context) exists, -- you can use 'OpenTelemetry.Context.empty'. -> Text -- ^ Span name -> SpanArguments -- ^ Additional span information -> m Span -- ^ The created span. createSpanWithoutCallStack t ctxt n args@SpanArguments {..} = liftIO $ do sId <- newSpanId $ tracerProviderIdGenerator $ tracerProvider t let parent = lookupSpan ctxt tId <- case parent of Nothing -> newTraceId $ tracerProviderIdGenerator $ tracerProvider t Just (Span s) -> traceId . Types.spanContext <$> readIORef s Just (FrozenSpan s) -> pure $ traceId s Just (Dropped s) -> pure $ traceId s if null $ tracerProviderProcessors $ tracerProvider t then pure $ Dropped $ SpanContext defaultTraceFlags False tId sId TraceState.empty else do (samplingOutcome, attrs, samplingTraceState) <- case parent of -- TODO, this seems logically like what we'd do here Just (Dropped _) -> pure (Drop, [], TraceState.empty) _ -> shouldSample (tracerProviderSampler $ tracerProvider t) ctxt tId n args -- TODO properly populate let ctxtForSpan = SpanContext { traceFlags = case samplingOutcome of Drop -> defaultTraceFlags RecordOnly -> defaultTraceFlags RecordAndSample -> setSampled defaultTraceFlags , isRemote = False , traceState = samplingTraceState , spanId = sId , traceId = tId } mkRecordingSpan = do st <- maybe getTimestamp pure startTime tid <- myThreadId let additionalInfo = [("thread.id", toAttribute $ getThreadId tid)] is = ImmutableSpan { spanName = n , spanContext = ctxtForSpan , spanParent = parent , spanKind = kind , spanAttributes = A.addAttributes (limitBy t spanAttributeCountLimit) emptyAttributes (H.unions [additionalInfo, attrs, attributes]) , spanLinks = let limitedLinks = fromMaybe 128 (linkCountLimit $ tracerProviderSpanLimits $ tracerProvider t) in frozenBoundedCollection limitedLinks $ fmap freezeLink links , spanEvents = emptyAppendOnlyBoundedCollection $ fromMaybe 128 (eventCountLimit $ tracerProviderSpanLimits $ tracerProvider t) , spanStatus = Unset , spanStart = st , spanEnd = Nothing , spanTracer = t } s <- newIORef is eResult <- try $ mapM_ (\processor -> processorOnStart processor s ctxt) $ tracerProviderProcessors $ tracerProvider t case eResult of Left err -> print (err :: SomeException) Right _ -> pure () pure $ Span s case samplingOutcome of Drop -> pure $ Dropped ctxtForSpan RecordOnly -> mkRecordingSpan RecordAndSample -> mkRecordingSpan where freezeLink :: NewLink -> Link freezeLink NewLink {..} = Link { frozenLinkContext = linkContext , frozenLinkAttributes = A.addAttributes (limitBy t linkAttributeCountLimit) A.emptyAttributes linkAttributes } ownCodeAttributes :: (HasCallStack) => H.HashMap Text Attribute ownCodeAttributes = case getCallStack callStack of _ : caller : _ -> srcAttributes caller _ -> mempty callerAttributes :: (HasCallStack) => H.HashMap Text Attribute callerAttributes = case getCallStack callStack of _ : _ : caller : _ -> srcAttributes caller _ -> mempty srcAttributes :: (String, SrcLoc) -> H.HashMap Text Attribute srcAttributes (fn, loc) = H.fromList [ ("code.function", toAttribute $ T.pack fn) , ("code.namespace", toAttribute $ T.pack $ srcLocModule loc) , ("code.filepath", toAttribute $ T.pack $ srcLocFile loc) , ("code.lineno", toAttribute $ srcLocStartLine loc) , ("code.package", toAttribute $ T.pack $ srcLocPackage loc) ] {- | Attributes are added to the end of the span argument list, so will be discarded if the number of attributes in the span exceeds the limit. -} addAttributesToSpanArguments :: H.HashMap Text Attribute -> SpanArguments -> SpanArguments addAttributesToSpanArguments attrs args = args {attributes = H.union (attributes args) attrs} {- | The simplest function for annotating code with trace information. @since 0.0.1.0 -} inSpan :: (MonadUnliftIO m, HasCallStack) => Tracer -> Text -- ^ The name of the span. This may be updated later via 'updateName' -> SpanArguments -- ^ Additional options for creating the span, such as 'SpanKind', -- span links, starting attributes, etc. -> m a -- ^ The action to perform. 'inSpan' will record the time spent on the -- action without forcing strict evaluation of the result. Any uncaught -- exceptions will be recorded and rethrown. -> m a inSpan t n args m = inSpan'' t n (args {attributes = H.union (attributes args) callerAttributes}) (const m) inSpan' :: (MonadUnliftIO m, HasCallStack) => Tracer -> Text -- ^ The name of the span. This may be updated later via 'updateName' -> SpanArguments -> (Span -> m a) -> m a inSpan' t n args = inSpan'' t n (args {attributes = H.union (attributes args) callerAttributes}) inSpan'' :: (MonadUnliftIO m, HasCallStack) => Tracer -> Text -- ^ The name of the span. This may be updated later via 'updateName' -> SpanArguments -> (Span -> m a) -> m a inSpan'' t n args f = do bracketError ( liftIO $ do ctx <- getContext s <- createSpanWithoutCallStack t ctx n args adjustContext (insertSpan s) pure (lookupSpan ctx, s) ) ( \e (parent, s) -> liftIO $ do forM_ e $ \(SomeException inner) -> do setStatus s $ Error $ T.pack $ displayException inner recordException s [("exception.escaped", toAttribute True)] Nothing inner endSpan s Nothing adjustContext $ \ctx -> maybe (removeSpan ctx) (`insertSpan` ctx) parent ) (\(_, s) -> f s) {- | Returns whether the the @Span@ is currently recording. If a span is dropped, this will always return False. If a span is from an external process, this will return True, and if the span was created by this process, the span will return True until endSpan is called. -} isRecording :: (MonadIO m) => Span -> m Bool isRecording (Span s) = liftIO (isNothing . spanEnd <$> readIORef s) isRecording (FrozenSpan _) = pure True isRecording (Dropped _) = pure False {- | Add an attribute to a span. Only has a useful effect on recording spans. As an application developer when you need to record an attribute first consult existing semantic conventions for Resources, Spans, and Metrics. If an appropriate name does not exists you will need to come up with a new name. To do that consider a few options: The name is specific to your company and may be possibly used outside the company as well. To avoid clashes with names introduced by other companies (in a distributed system that uses applications from multiple vendors) it is recommended to prefix the new name by your company’s reverse domain name, e.g. 'com.acme.shopname'. The name is specific to your application that will be used internally only. If you already have an internal company process that helps you to ensure no name clashes happen then feel free to follow it. Otherwise it is recommended to prefix the attribute name by your application name, provided that the application name is reasonably unique within your organization (e.g. 'myuniquemapapp.longitude' is likely fine). Make sure the application name does not clash with an existing semantic convention namespace. The name may be generally applicable to applications in the industry. In that case consider submitting a proposal to this specification to add a new name to the semantic conventions, and if necessary also to add a new namespace. It is recommended to limit names to printable Basic Latin characters (more precisely to 'U+0021' .. 'U+007E' subset of Unicode code points), although the Haskell OpenTelemetry specification DOES provide full Unicode support. Attribute names that start with 'otel.' are reserved to be defined by OpenTelemetry specification. These are typically used to express OpenTelemetry concepts in formats that don’t have a corresponding concept. For example, the 'otel.library.name' attribute is used to record the instrumentation library name, which is an OpenTelemetry concept that is natively represented in OTLP, but does not have an equivalent in other telemetry formats and protocols. Any additions to the 'otel.*' namespace MUST be approved as part of OpenTelemetry specification. @since 0.0.1.0 -} addAttribute :: (MonadIO m, A.ToAttribute a) => Span -- ^ Span to add the attribute to -> Text -- ^ Attribute name -> a -- ^ Attribute value -> m () addAttribute (Span s) k v = liftIO $ modifyIORef' s $ \(!i) -> i { spanAttributes = OpenTelemetry.Attributes.addAttribute (limitBy (spanTracer i) spanAttributeCountLimit) (spanAttributes i) k v } addAttribute (FrozenSpan _) _ _ = pure () addAttribute (Dropped _) _ _ = pure () {- | A convenience function related to 'addAttribute' that adds multiple attributes to a span at the same time. This function may be slightly more performant than repeatedly calling 'addAttribute'. @since 0.0.1.0 -} addAttributes :: (MonadIO m) => Span -> H.HashMap Text A.Attribute -> m () addAttributes (Span s) attrs = liftIO $ modifyIORef' s $ \(!i) -> i { spanAttributes = OpenTelemetry.Attributes.addAttributes (limitBy (spanTracer i) spanAttributeCountLimit) (spanAttributes i) attrs } addAttributes (FrozenSpan _) _ = pure () addAttributes (Dropped _) _ = pure () {- | Add an event to a recording span. Events will not be recorded for remote spans and dropped spans. @since 0.0.1.0 -} addEvent :: (MonadIO m) => Span -> NewEvent -> m () addEvent (Span s) NewEvent {..} = liftIO $ do t <- maybe getTimestamp pure newEventTimestamp modifyIORef' s $ \(!i) -> i { spanEvents = appendToBoundedCollection (spanEvents i) $ Event { eventName = newEventName , eventAttributes = A.addAttributes (limitBy (spanTracer i) eventAttributeCountLimit) emptyAttributes newEventAttributes , eventTimestamp = t } } addEvent (FrozenSpan _) _ = pure () addEvent (Dropped _) _ = pure () {- | Sets the Status of the Span. If used, this will override the default @Span@ status, which is @Unset@. These values form a total order: Ok > Error > Unset. This means that setting Status with StatusCode=Ok will override any prior or future attempts to set span Status with StatusCode=Error or StatusCode=Unset. @since 0.0.1.0 -} setStatus :: (MonadIO m) => Span -> SpanStatus -> m () setStatus (Span s) st = liftIO $ modifyIORef' s $ \(!i) -> i { spanStatus = max st (spanStatus i) } setStatus (FrozenSpan _) _ = pure () setStatus (Dropped _) _ = pure () alterFlags :: (MonadIO m) => Span -> (TraceFlags -> TraceFlags) -> m () alterFlags (Span s) f = liftIO $ modifyIORef' s $ \(!i) -> i { spanContext = (spanContext i) { traceFlags = f $ traceFlags $ spanContext i } } alterFlags (FrozenSpan _) _ = pure () alterFlags (Dropped _) _ = pure () {- | Updates the Span name. Upon this update, any sampling behavior based on Span name will depend on the implementation. Note that @Sampler@s can only consider information already present during span creation. Any changes done later, including updated span name, cannot change their decisions. Alternatives for the name update may be late Span creation, when Span is started with the explicit timestamp from the past at the moment where the final Span name is known, or reporting a Span with the desired name as a child Span. @since 0.0.1.0 -} updateName :: (MonadIO m) => Span -> Text -- ^ The new span name, which supersedes whatever was passed in when the Span was started -> m () updateName (Span s) n = liftIO $ modifyIORef' s $ \(!i) -> i {spanName = n} updateName (FrozenSpan _) _ = pure () updateName (Dropped _) _ = pure () {- | Signals that the operation described by this span has now (or at the time optionally specified) ended. This does have any effects on child spans. Those may still be running and can be ended later. This also does not inactivate the Span in any Context it is active in. It is still possible to use an ended span as parent via a Context it is contained in. Also, putting the Span into a Context will still work after the Span was ended. @since 0.0.1.0 -} endSpan :: (MonadIO m) => Span -> Maybe Timestamp -- ^ Optional @Timestamp@ signalling the end time of the span. If not provided, the current time will be used. -> m () endSpan (Span s) mts = liftIO $ do ts <- maybe getTimestamp pure mts (alreadyFinished, frozenS) <- atomicModifyIORef' s $ \(!i) -> let ref = i {spanEnd = spanEnd i <|> Just ts} in (ref, (isJust $ spanEnd i, ref)) unless alreadyFinished $ do eResult <- try $ mapM_ (`processorOnEnd` s) $ tracerProviderProcessors $ tracerProvider $ spanTracer frozenS case eResult of Left err -> print (err :: SomeException) Right _ -> pure () endSpan (FrozenSpan _) _ = pure () endSpan (Dropped _) _ = pure () {- | A specialized variant of @addEvent@ that records attributes conforming to the OpenTelemetry specification's @since 0.0.1.0 -} recordException :: (MonadIO m, Exception e) => Span -> H.HashMap Text Attribute -> Maybe Timestamp -> e -> m () recordException s attrs ts e = liftIO $ do cs <- whoCreated e let message = T.pack $ show e addEvent s $ NewEvent { newEventName = "exception" , newEventAttributes = H.union attrs [ ("exception.type", A.toAttribute $ T.pack $ show $ typeOf e) , ("exception.message", A.toAttribute message) , ("exception.stacktrace", A.toAttribute $ T.unlines $ map T.pack cs) ] , newEventTimestamp = ts } -- | Returns @True@ if the @SpanContext@ has a non-zero @TraceID@ and a non-zero @SpanID@ isValid :: SpanContext -> Bool isValid sc = not (isEmptyTraceId (traceId sc) && isEmptySpanId (spanId sc)) {- | Returns @True@ if the @SpanContext@ was propagated from a remote parent, When extracting a SpanContext through the Propagators API, isRemote MUST return @True@, whereas for the SpanContext of any child spans it MUST return @False@. -} spanIsRemote :: (MonadIO m) => Span -> m Bool spanIsRemote (Span s) = liftIO $ do i <- readIORef s pure $ Types.isRemote $ Types.spanContext i spanIsRemote (FrozenSpan c) = pure $ Types.isRemote c spanIsRemote (Dropped _) = pure False {- | Really only intended for tests, this function does not conform to semantic versioning . -} unsafeReadSpan :: (MonadIO m) => Span -> m ImmutableSpan unsafeReadSpan = \case Span ref -> liftIO $ readIORef ref FrozenSpan _s -> error "This span is from another process" Dropped _s -> error "This span was dropped" wrapSpanContext :: SpanContext -> Span wrapSpanContext = FrozenSpan {- | This can be useful for pulling data for attributes and using it to copy / otherwise use the data to further enrich instrumentation. -} spanGetAttributes :: (MonadIO m) => Span -> m A.Attributes spanGetAttributes = \case Span ref -> do s <- liftIO $ readIORef ref pure $ spanAttributes s FrozenSpan _ -> pure A.emptyAttributes Dropped _ -> pure A.emptyAttributes {- | Sometimes, you may have a more accurate notion of when a traced operation has ended. In this case you may call 'getTimestamp', and then supply 'endSpan' with the more accurate timestamp you have acquired. When using the monadic interface, (such as 'OpenTelemetry.Trace.Monad.inSpan', you may call 'endSpan' early to record the information, and the first call to 'endSpan' will be honored. @since 0.0.1.0 -} getTimestamp :: (MonadIO m) => m Timestamp getTimestamp = liftIO $ coerce @(IO TimeSpec) @(IO Timestamp) $ getTime Realtime limitBy :: Tracer -> (SpanLimits -> Maybe Int) -- ^ Attribute count -> AttributeLimits limitBy t countF = AttributeLimits { attributeCountLimit = countLimit , attributeLengthLimit = lengthLimit } where countLimit = countF (tracerProviderSpanLimits $ tracerProvider t) <|> attributeCountLimit (tracerProviderAttributeLimits $ tracerProvider t) lengthLimit = spanAttributeValueLengthLimit (tracerProviderSpanLimits $ tracerProvider t) <|> attributeLengthLimit (tracerProviderAttributeLimits $ tracerProvider t) globalTracer :: IORef TracerProvider globalTracer = unsafePerformIO $ do p <- createTracerProvider [] emptyTracerProviderOptions newIORef p {-# NOINLINE globalTracer #-} data TracerProviderOptions = TracerProviderOptions { tracerProviderOptionsIdGenerator :: IdGenerator , tracerProviderOptionsSampler :: Sampler , tracerProviderOptionsResources :: MaterializedResources , tracerProviderOptionsAttributeLimits :: AttributeLimits , tracerProviderOptionsSpanLimits :: SpanLimits , tracerProviderOptionsPropagators :: Propagator Context RequestHeaders ResponseHeaders , tracerProviderOptionsLogger :: Log Text -> IO () } {- | Options for creating a 'TracerProvider' with invalid ids, no resources, default limits, and no propagators. In effect, tracing is a no-op when using this configuration. @since 0.0.1.0 -} emptyTracerProviderOptions :: TracerProviderOptions emptyTracerProviderOptions = TracerProviderOptions dummyIdGenerator (parentBased $ parentBasedOptions alwaysOn) emptyMaterializedResources defaultAttributeLimits defaultSpanLimits mempty (\_ -> pure ()) {- | Initialize a new tracer provider You should generally use 'getGlobalTracerProvider' for most applications. -} createTracerProvider :: (MonadIO m) => [Processor] -> TracerProviderOptions -> m TracerProvider createTracerProvider ps opts = liftIO $ do let g = tracerProviderOptionsIdGenerator opts pure $ TracerProvider (V.fromList ps) g (tracerProviderOptionsSampler opts) (tracerProviderOptionsResources opts) (tracerProviderOptionsAttributeLimits opts) (tracerProviderOptionsSpanLimits opts) (tracerProviderOptionsPropagators opts) (tracerProviderOptionsLogger opts) {- | Access the globally configured 'TracerProvider'. Once the the global tracer provider is initialized via the OpenTelemetry SDK, 'Tracer's created from this 'TracerProvider' will export spans to their configured exporters. Prior to that, any 'Tracer's acquired from the uninitialized 'TracerProvider' will create no-op spans. @since 0.0.1.0 -} getGlobalTracerProvider :: (MonadIO m) => m TracerProvider getGlobalTracerProvider = liftIO $ readIORef globalTracer {- | Overwrite the globally configured 'TracerProvider'. 'Tracer's acquired from the previously installed 'TracerProvider' will continue to use that 'TracerProvider's configured span processors, exporters, and other settings. @since 0.0.1.0 -} setGlobalTracerProvider :: (MonadIO m) => TracerProvider -> m () setGlobalTracerProvider = liftIO . writeIORef globalTracer getTracerProviderResources :: TracerProvider -> MaterializedResources getTracerProviderResources = tracerProviderResources getTracerProviderPropagators :: TracerProvider -> Propagator Context RequestHeaders ResponseHeaders getTracerProviderPropagators = tracerProviderPropagators -- | Tracer configuration options. newtype TracerOptions = TracerOptions { tracerSchema :: Maybe Text -- ^ OpenTelemetry provides a schema for describing common attributes so that backends can easily parse and identify relevant information. -- It is important to understand these conventions when writing instrumentation, in order to normalize your data and increase its utility. -- -- In particular, this option is valuable to set when possible, because it allows vendors to normalize data accross releases in order to account -- for attribute name changes. } -- | Default Tracer options tracerOptions :: TracerOptions tracerOptions = TracerOptions Nothing {- | A small utility lens for extracting a 'Tracer' from a larger data type This will generally be most useful as a means of implementing 'OpenTelemetry.Trace.Monad.getTracer' @since 0.0.1.0 -} class HasTracer s where tracerL :: Lens' s Tracer makeTracer :: TracerProvider -> InstrumentationLibrary -> TracerOptions -> Tracer makeTracer tp n TracerOptions {} = Tracer n tp getTracer :: (MonadIO m) => TracerProvider -> InstrumentationLibrary -> TracerOptions -> m Tracer getTracer tp n TracerOptions {} = liftIO $ do pure $ Tracer n tp {-# DEPRECATED getTracer "use makeTracer" #-} getImmutableSpanTracer :: ImmutableSpan -> Tracer getImmutableSpanTracer = spanTracer getTracerTracerProvider :: Tracer -> TracerProvider getTracerTracerProvider = tracerProvider {- | Smart constructor for 'SpanArguments' providing reasonable values for most 'Span's created that are internal to an application. Defaults: - `kind`: `Internal` - `attributes`: @[]@ - `links`: @[]@ - `startTime`: `Nothing` (`getTimestamp` will be called upon `Span` creation) -} defaultSpanArguments :: SpanArguments defaultSpanArguments = SpanArguments { kind = Internal , attributes = [] , links = [] , startTime = Nothing } {- | This method provides a way for provider to do any cleanup required. This will also trigger shutdowns on all internal processors. @since 0.0.1.0 -} shutdownTracerProvider :: (MonadIO m) => TracerProvider -> m () shutdownTracerProvider TracerProvider {..} = liftIO $ do asyncShutdownResults <- forM tracerProviderProcessors $ \processor -> do processorShutdown processor mapM_ wait asyncShutdownResults {- | This method provides a way for provider to immediately export all spans that have not yet been exported for all the internal processors. -} forceFlushTracerProvider :: (MonadIO m) => TracerProvider -> Maybe Int -- ^ Optional timeout in microseconds, defaults to 5,000,000 (5s) -> m FlushResult -- ^ Result that denotes whether the flush action succeeded, failed, or timed out. forceFlushTracerProvider TracerProvider {..} mtimeout = liftIO $ do jobs <- forM tracerProviderProcessors $ \processor -> async $ do processorForceFlush processor mresult <- timeout (fromMaybe 5_000_000 mtimeout) $ foldM ( \status action -> do res <- waitCatch action pure $! case res of Left _err -> FlushError Right _ok -> status ) FlushSuccess jobs case mresult of Nothing -> pure FlushTimeout Just res -> pure res {- | Utility function to only perform costly attribute annotations for spans that are actually -} whenSpanIsRecording :: (MonadIO m) => Span -> m () -> m () whenSpanIsRecording (Span ref) m = do span_ <- liftIO $ readIORef ref case spanEnd span_ of Nothing -> m Just _ -> pure () whenSpanIsRecording (FrozenSpan _) _ = pure () whenSpanIsRecording (Dropped _) _ = pure () timestampNanoseconds :: Timestamp -> Word64 timestampNanoseconds (Timestamp TimeSpec {..}) = fromIntegral (sec * 1_000_000_000) + fromIntegral nsec