steffan-westcott.clj-otel.context — com.github.steffan-westcott/clj-otel-api 0.1.4

Functions for working with io.opentelemetry.context.Context objects.

->headers clj

(->headers)

(->headers {:keys [context text-map-propagator]
            :or {context (current)
                 text-map-propagator (otel/get-text-map-propagator)}})

Returns a map to merge into the headers of an HTTP request for the purpose of context propagation i.e. transfer context to a remote server. May take an optional map argument as follows:

key	description
:context	Context to propagate (default: current context).
:text-map-propagator	Propagator used to create headers map entries (default: propagator set in global OpenTelemetry instance).

AsContextKey clj protocol

context-key clj

(context-key k)

Coerces k to a ContextKey.

assoc-value clj

(assoc-value context implicit-context-keyed)

(assoc-value context key value)

Associates a key-value with a context, returning a new Context that includes the key-value. Does not use nor affect the current context. Takes key and value, or an ImplicitContextKeyed instance which is a value that uses a predetermined key.

close-scope! clj

(close-scope! scope)

Closes the given scope.

current clj

(current)

Returns the current context, a thread local Context object. If no such context exists, the root context is returned instead.

current-context-interceptor clj

(current-context-interceptor context-key scope-key)

Returns a Pedestal interceptor that will on entry set the current context to the value that has key context-key in the interceptor context map. The original value of current context is restored on evaluation on interceptor exit (either leave or error). The Scope of the set context is stored in the interceptor context map with key scope-key.

get-value clj

(get-value context key)

Returns the value stored in the context for the given context key.

headers->merged-context clj

(headers->merged-context headers)

(headers->merged-context
  headers
  {:keys [context text-map-propagator]
   :or {context (current) text-map-propagator (otel/get-text-map-propagator)}})

Returns a context formed by extracting a propagated context from a map headers and merging with another context i.e. accept context transfer from a remote server. May take an option map as follows:

key	description
:context	Context to merge with (default: current context).
:text-map-propagator	Propagator used to extract data from the headers map (default: propagator set in global OpenTelemetry instance).

root clj

(root)

Returns the root context that all other contexts are derived from.

set-current! clj

(set-current! context)

Sets the current context. The returned Scope must be closed to prevent broken traces and memory leaks. with-context! and with-value! can be used instead of this function to ensure the scope is closed when leaving a lexical boundary i.e. a body of forms.

with-context! clj macro

(with-context! context & body)

Sets the current context to be the provided context, then evaluates body. The original current context is restored after body evaluation completes.

with-value! clj macro

(with-value! implicit-context-keyed & body)

Make a new current context by associating an ImplicitContextKeyed instance implicit-context-keyed then evaluate body. The original current context is restored after body evaluation completes.