Allows to override codec's default baggage prefix.

src/configuration.js

@@ -226,6 +226,7 @@ export default class Configuration {
 
  return new Tracer(config.serviceName, reporter, sampler, {
  contextKey: options.contextKey,
+ baggagePrefix: options.baggagePrefix,
  metrics: options.metrics,
  logger: options.logger,
  tags: options.tags,

src/tracer.js

@@ -55,6 +55,7 @@ export default class Tracer {
  * @param {Object} [options.logger] - a logger matching NullLogger API from ./logger.js.
  * @param {Object} [options.baggageRestrictionManager] - a baggageRestrictionManager matching
  * @param {Object} [options.contextKey] - a name of the key to extract/inject context from headers
+ * @param {Object} [options.baggagePrefix] - a name of the context baggage key prefix
  * BaggageRestrictionManager API from ./baggage.js.
  */
  constructor(
@@ -84,6 +85,7 @@ export default class Tracer {
 
  let codecOptions = {
  contextKey: options.contextKey || null,
+ baggagePrefix: options.baggagePrefix || null,
  urlEncoding: false,
  metrics: this._metrics,
  };

test/init_tracer.js

@@ -210,12 +210,16 @@ describe('initTracer', () => {
  x: 'y',
  },
  contextKey: 'custom-header',
+ baggagePrefix: 'prfx-',
  }
  );
  assert.equal(tracer._logger, logger);
  assert.equal(tracer._metrics._factory, metrics);
  assert.equal(tracer._tags['x'], 'y');
- assert.equal(tracer._injectors[opentracing.FORMAT_TEXT_MAP]._contextKey, 'custom-header');
+
+ const textMapInjector = tracer._injectors[opentracing.FORMAT_TEXT_MAP];
+ assert.equal(textMapInjector._contextKey, 'custom-header');
+ assert.equal(textMapInjector._baggagePrefix, 'prfx-');
  tracer.close(done);
  });