feat(context): add utils method to remove keys from context #66 (#69)

Author: vmarchaud

src/api/propagation.ts

@@ -28,7 +28,11 @@ import {
   registerGlobal,
   unregisterGlobal,
 } from '../internal/global-utils';
-import { getBaggage, setBaggage } from '../baggage/context-helpers';
+import {
+  getBaggage,
+  setBaggage,
+  deleteBaggage,
+} from '../baggage/context-helpers';
 import { createBaggage } from '../baggage/utils';
 
 const API_NAME = 'propagation';
@@ -108,6 +112,8 @@ export class PropagationAPI {
 
   public setBaggage = setBaggage;
 
+  public deleteBaggage = deleteBaggage;
+
   private _getGlobalPropagator(): TextMapPropagator {
     return getGlobal(API_NAME) || NOOP_TEXT_MAP_PROPAGATOR;
   }

src/api/trace.ts

@@ -27,6 +27,7 @@ import {
 import { Tracer } from '../trace/tracer';
 import { TracerProvider } from '../trace/tracer_provider';
 import {
+  deleteSpan,
   getSpan,
   getSpanContext,
   setSpan,
@@ -89,6 +90,8 @@ export class TraceAPI {
 
   public isSpanContextValid = isSpanContextValid;
 
+  public deleteSpan = deleteSpan;
+
   public getSpan = getSpan;
 
   public getSpanContext = getSpanContext;

src/baggage/context-helpers.ts

@@ -24,6 +24,8 @@ import { Baggage } from './types';
 const BAGGAGE_KEY = createContextKey('OpenTelemetry Baggage Key');
 
 /**
+ * Retrieve the current baggage from the given context
+ *
  * @param {Context} Context that manage all context values
  * @returns {Baggage} Extracted baggage from the context
  */
@@ -32,9 +34,20 @@ export function getBaggage(context: Context): Baggage | undefined {
 }
 
 /**
+ * Store a baggage in the given context
+ *
  * @param {Context} Context that manage all context values
  * @param {Baggage} baggage that will be set in the actual context
  */
 export function setBaggage(context: Context, baggage: Baggage): Context {
   return context.setValue(BAGGAGE_KEY, baggage);
 }
+
+/**
+ * Delete the baggage stored in the given context
+ *
+ * @param {Context} Context that manage all context values
+ */
+export function deleteBaggage(context: Context): Context {
+  return context.deleteValue(BAGGAGE_KEY);
+}

src/trace/context-utils.ts

@@ -44,6 +44,15 @@ export function setSpan(context: Context, span: Span): Context {
   return context.setValue(SPAN_KEY, span);
 }
 
+/**
+ * Remove current span stored in the context
+ *
+ * @param context context to delete span from
+ */
+export function deleteSpan(context: Context): Context {
+  return context.deleteValue(SPAN_KEY);
+}
+
 /**
  * Wrap span context in a NoopSpan and set as span in a new
  * context