From 46f31dd2285d55d239195032528c3dab1bf0e15c Mon Sep 17 00:00:00 2001
From: Matthew Wear <matthew.wear@gmail.com>
Date: Mon, 26 Oct 2020 14:00:08 -0700
Subject: [PATCH] chore!: move b3 into its own package (#1595)

---
 benchmark/propagator.js                       |   3 +-
 examples/tracer-web/examples/fetch/index.js   |   2 +-
 .../examples/xml-http-request/index.js        |   2 +-
 examples/tracer-web/package.json              |   1 +
 packages/opentelemetry-api/README.md          |   2 +-
 packages/opentelemetry-core/README.md         |  13 --
 packages/opentelemetry-core/package.json      |   1 +
 packages/opentelemetry-core/src/index.ts      |   3 -
 .../test/context/composite.test.ts            |   2 +-
 .../opentelemetry-plugin-fetch/package.json   |   1 +
 .../test/fetch.test.ts                        |  37 ++--
 .../package.json                              |   1 +
 .../test/xhr.test.ts                          |  12 +-
 .../opentelemetry-propagator-b3/.eslintignore |   1 +
 .../opentelemetry-propagator-b3/.eslintrc.js  |   9 +
 .../opentelemetry-propagator-b3/.npmignore    |   4 +
 packages/opentelemetry-propagator-b3/LICENSE  | 201 ++++++++++++++++++
 .../opentelemetry-propagator-b3/README.md     | 172 +++++++++++++++
 .../opentelemetry-propagator-b3/package.json  |  61 ++++++
 .../src}/B3MultiPropagator.ts                 |   2 +-
 .../src}/B3Propagator.ts                      |  12 +-
 .../src}/B3SinglePropagator.ts                |   2 +-
 .../src/common.ts}                            |   0
 .../opentelemetry-propagator-b3/src/index.ts  |  20 ++
 .../opentelemetry-propagator-b3/src/types.ts  |  26 +++
 .../src/version.ts                            |  18 ++
 .../test}/B3MultiPropagator.test.ts           |  20 +-
 .../test}/B3Propagator.test.ts                |  10 +-
 .../test}/B3SinglePropagator.test.ts          |   4 +-
 .../opentelemetry-propagator-b3/tsconfig.json |  11 +
 packages/opentelemetry-web/package.json       |   1 +
 .../test/WebTracerProvider.test.ts            |   3 +-
 32 files changed, 590 insertions(+), 67 deletions(-)
 create mode 100644 packages/opentelemetry-propagator-b3/.eslintignore
 create mode 100644 packages/opentelemetry-propagator-b3/.eslintrc.js
 create mode 100644 packages/opentelemetry-propagator-b3/.npmignore
 create mode 100644 packages/opentelemetry-propagator-b3/LICENSE
 create mode 100644 packages/opentelemetry-propagator-b3/README.md
 create mode 100644 packages/opentelemetry-propagator-b3/package.json
 rename packages/{opentelemetry-core/src/context/propagation => opentelemetry-propagator-b3/src}/B3MultiPropagator.ts (98%)
 rename packages/{opentelemetry-core/src/context/propagation => opentelemetry-propagator-b3/src}/B3Propagator.ts (90%)
 rename packages/{opentelemetry-core/src/context/propagation => opentelemetry-propagator-b3/src}/B3SinglePropagator.ts (98%)
 rename packages/{opentelemetry-core/src/context/propagation/b3-common.ts => opentelemetry-propagator-b3/src/common.ts} (100%)
 create mode 100644 packages/opentelemetry-propagator-b3/src/index.ts
 create mode 100644 packages/opentelemetry-propagator-b3/src/types.ts
 create mode 100644 packages/opentelemetry-propagator-b3/src/version.ts
 rename packages/{opentelemetry-core/test/context => opentelemetry-propagator-b3/test}/B3MultiPropagator.test.ts (97%)
 rename packages/{opentelemetry-core/test/context => opentelemetry-propagator-b3/test}/B3Propagator.test.ts (94%)
 rename packages/{opentelemetry-core/test/context => opentelemetry-propagator-b3/test}/B3SinglePropagator.test.ts (98%)
 create mode 100644 packages/opentelemetry-propagator-b3/tsconfig.json

diff --git a/benchmark/propagator.js b/benchmark/propagator.js
index 6f547743d1..e3e5617523 100644
--- a/benchmark/propagator.js
+++ b/benchmark/propagator.js
@@ -4,11 +4,12 @@ const benchmark = require('./benchmark');
 const opentelemetry = require('../packages/opentelemetry-core');
 const api = require('../packages/opentelemetry-api');
 const { Context } = require('../packages/opentelemetry-context-base');
+const { B3Propagator } = require('../packages/opentelemetry-propagator-b3');
 
 const setups = [
   {
     name: 'B3Propagator',
-    propagator: new opentelemetry.B3Propagator(),
+    propagator: new B3Propagator(),
     injectCarrier: {},
     extractCarrier: {
       'x-b3-traceid': 'd4cda95b652f4a1592b449d5929fda1b',
diff --git a/examples/tracer-web/examples/fetch/index.js b/examples/tracer-web/examples/fetch/index.js
index 2ed363453a..6717136bee 100644
--- a/examples/tracer-web/examples/fetch/index.js
+++ b/examples/tracer-web/examples/fetch/index.js
@@ -5,7 +5,7 @@ import { CollectorTraceExporter } from '@opentelemetry/exporter-collector';
 import { WebTracerProvider } from '@opentelemetry/web';
 import { FetchPlugin } from '@opentelemetry/plugin-fetch';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
-import { B3Propagator } from '@opentelemetry/core';
+import { B3Propagator } from '@opentelemetry/propagator-b3';
 
 const provider = new WebTracerProvider({
   plugins: [
diff --git a/examples/tracer-web/examples/xml-http-request/index.js b/examples/tracer-web/examples/xml-http-request/index.js
index fb1a6529c8..d0a148e7e3 100644
--- a/examples/tracer-web/examples/xml-http-request/index.js
+++ b/examples/tracer-web/examples/xml-http-request/index.js
@@ -3,7 +3,7 @@ import { WebTracerProvider } from '@opentelemetry/web';
 import { XMLHttpRequestPlugin } from '@opentelemetry/plugin-xml-http-request';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
 import { CollectorTraceExporter } from '@opentelemetry/exporter-collector';
-import { B3Propagator } from '@opentelemetry/core';
+import { B3Propagator } from '@opentelemetry/propagator-b3';
 
 const providerWithZone = new WebTracerProvider({
   plugins: [
diff --git a/examples/tracer-web/package.json b/examples/tracer-web/package.json
index 82ce7823c2..f999bfdd49 100644
--- a/examples/tracer-web/package.json
+++ b/examples/tracer-web/package.json
@@ -39,6 +39,7 @@
     "@opentelemetry/exporter-collector": "^0.12.0",
     "@opentelemetry/exporter-zipkin": "^0.12.0",
     "@opentelemetry/metrics": "^0.12.0",
+    "@opentelemetry/propagator-b3": "^0.12.0",
     "@opentelemetry/plugin-document-load": "^0.9.0",
     "@opentelemetry/plugin-fetch": "^0.12.0",
     "@opentelemetry/plugin-user-interaction": "^0.9.0",
diff --git a/packages/opentelemetry-api/README.md b/packages/opentelemetry-api/README.md
index b824c4ae36..e85eac8c25 100644
--- a/packages/opentelemetry-api/README.md
+++ b/packages/opentelemetry-api/README.md
@@ -106,7 +106,7 @@ Because the npm installer and node module resolution algorithm could potentially
 If you prefer to choose your own propagator or context manager, you may pass an options object into the `tracerProvider.register()` method. Omitted or `undefined` options will be replaced by a default value and `null` values will be skipped.
 
 ```javascript
-const { B3Propagator } = require("@opentelemetry/core");
+const { B3Propagator } = require("@opentelemetry/propagator-b3");
 
 tracerProvider.register({
   // Use B3 Propagation
diff --git a/packages/opentelemetry-core/README.md b/packages/opentelemetry-core/README.md
index 5f60e17947..1b0c37196e 100644
--- a/packages/opentelemetry-core/README.md
+++ b/packages/opentelemetry-core/README.md
@@ -14,7 +14,6 @@ This package provides default implementations of the OpenTelemetry API for trace
   - [Built-in Implementations](#built-in-implementations)
     - [Built-in Propagators](#built-in-propagators)
       - [HttpTraceContext Propagator](#httptracecontext-propagator)
-      - [B3 Propagator](#b3-propagator)
       - [Composite Propagator](#composite-propagator)
       - [Correlation Context Propagator](#correlation-context-propagator)
     - [Built-in Sampler](#built-in-sampler)
@@ -38,18 +37,6 @@ const { HttpTraceContext } = require("@opentelemetry/core");
 api.propagation.setGlobalPropagator(new HttpTraceContext());
 ```
 
-#### B3 Propagator
-
-This is propagator for the B3 HTTP header format, which sends a `SpanContext` on the wire in an HTTP request, allowing other services to create spans with the right context. Based on: <https://github.com/openzipkin/b3-propagation>
-
-```js
-const api = require("@opentelemetry/api");
-const { B3Propagator } = require("@opentelemetry/core");
-
-/* Set Global Propagator */
-api.propagation.setGlobalPropagator(new B3Propagator());
-```
-
 #### Composite Propagator
 
 Combines multiple propagators into a single propagator.
diff --git a/packages/opentelemetry-core/package.json b/packages/opentelemetry-core/package.json
index 138cffd786..fef4f8e1ae 100644
--- a/packages/opentelemetry-core/package.json
+++ b/packages/opentelemetry-core/package.json
@@ -52,6 +52,7 @@
     "access": "public"
   },
   "devDependencies": {
+    "@opentelemetry/propagator-b3": "^0.12.0",
     "@types/mocha": "8.0.2",
     "@types/node": "14.0.27",
     "@types/semver": "7.3.2",
diff --git a/packages/opentelemetry-core/src/index.ts b/packages/opentelemetry-core/src/index.ts
index d3a84ee651..e3a836e1b2 100644
--- a/packages/opentelemetry-core/src/index.ts
+++ b/packages/opentelemetry-core/src/index.ts
@@ -23,9 +23,6 @@ export * from './common/time';
 export * from './common/types';
 export * from './ExportResult';
 export * from './version';
-export * from './context/propagation/B3Propagator';
-export * from './context/propagation/B3SinglePropagator';
-export * from './context/propagation/B3MultiPropagator';
 export * from './context/propagation/composite';
 export * from './context/propagation/HttpTraceContext';
 export * from './context/propagation/types';
diff --git a/packages/opentelemetry-core/test/context/composite.test.ts b/packages/opentelemetry-core/test/context/composite.test.ts
index eccf66e9de..b54c9859a6 100644
--- a/packages/opentelemetry-core/test/context/composite.test.ts
+++ b/packages/opentelemetry-core/test/context/composite.test.ts
@@ -34,7 +34,7 @@ import {
   X_B3_SAMPLED,
   X_B3_SPAN_ID,
   X_B3_TRACE_ID,
-} from '../../src/context/propagation/B3MultiPropagator';
+} from '@opentelemetry/propagator-b3';
 import {
   TRACE_PARENT_HEADER,
   TRACE_STATE_HEADER,
diff --git a/packages/opentelemetry-plugin-fetch/package.json b/packages/opentelemetry-plugin-fetch/package.json
index 3493f3ef00..93d501be07 100644
--- a/packages/opentelemetry-plugin-fetch/package.json
+++ b/packages/opentelemetry-plugin-fetch/package.json
@@ -46,6 +46,7 @@
   "devDependencies": {
     "@babel/core": "7.11.1",
     "@opentelemetry/context-zone": "^0.12.0",
+    "@opentelemetry/propagator-b3": "^0.12.0",
     "@opentelemetry/tracing": "^0.12.0",
     "@types/mocha": "8.0.2",
     "@types/node": "14.0.27",
diff --git a/packages/opentelemetry-plugin-fetch/test/fetch.test.ts b/packages/opentelemetry-plugin-fetch/test/fetch.test.ts
index 39ca5ab8f3..647537f6c3 100644
--- a/packages/opentelemetry-plugin-fetch/test/fetch.test.ts
+++ b/packages/opentelemetry-plugin-fetch/test/fetch.test.ts
@@ -15,6 +15,13 @@
  */
 import * as api from '@opentelemetry/api';
 import * as core from '@opentelemetry/core';
+import {
+  B3Propagator,
+  B3InjectEncoding,
+  X_B3_TRACE_ID,
+  X_B3_SPAN_ID,
+  X_B3_SAMPLED,
+} from '@opentelemetry/propagator-b3';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
 import * as tracing from '@opentelemetry/tracing';
 import {
@@ -219,8 +226,8 @@ describe('fetch', () => {
 
   before(() => {
     api.propagation.setGlobalPropagator(
-      new core.B3Propagator({
-        injectEncoding: core.B3InjectEncoding.MULTI_HEADER,
+      new B3Propagator({
+        injectEncoding: B3InjectEncoding.MULTI_HEADER,
       })
     );
   });
@@ -449,26 +456,26 @@ describe('fetch', () => {
     it('should set trace headers', () => {
       const span: api.Span = exportSpy.args[1][0][0];
       assert.strictEqual(
-        lastResponse.headers[core.X_B3_TRACE_ID],
+        lastResponse.headers[X_B3_TRACE_ID],
         span.context().traceId,
-        `trace header '${core.X_B3_TRACE_ID}' not set`
+        `trace header '${X_B3_TRACE_ID}' not set`
       );
       assert.strictEqual(
-        lastResponse.headers[core.X_B3_SPAN_ID],
+        lastResponse.headers[X_B3_SPAN_ID],
         span.context().spanId,
-        `trace header '${core.X_B3_SPAN_ID}' not set`
+        `trace header '${X_B3_SPAN_ID}' not set`
       );
       assert.strictEqual(
-        lastResponse.headers[core.X_B3_SAMPLED],
+        lastResponse.headers[X_B3_SAMPLED],
         String(span.context().traceFlags),
-        `trace header '${core.X_B3_SAMPLED}' not set`
+        `trace header '${X_B3_SAMPLED}' not set`
       );
     });
 
     it('should set trace headers with a request object', () => {
       const r = new Request('url');
       window.fetch(r);
-      assert.ok(typeof r.headers.get(core.X_B3_TRACE_ID) === 'string');
+      assert.ok(typeof r.headers.get(X_B3_TRACE_ID) === 'string');
     });
 
     it('should NOT clear the resources', () => {
@@ -486,19 +493,19 @@ describe('fetch', () => {
       });
       it('should NOT set trace headers', () => {
         assert.strictEqual(
-          lastResponse.headers[core.X_B3_TRACE_ID],
+          lastResponse.headers[X_B3_TRACE_ID],
           undefined,
-          `trace header '${core.X_B3_TRACE_ID}' should not be set`
+          `trace header '${X_B3_TRACE_ID}' should not be set`
         );
         assert.strictEqual(
-          lastResponse.headers[core.X_B3_SPAN_ID],
+          lastResponse.headers[X_B3_SPAN_ID],
           undefined,
-          `trace header '${core.X_B3_SPAN_ID}' should not be set`
+          `trace header '${X_B3_SPAN_ID}' should not be set`
         );
         assert.strictEqual(
-          lastResponse.headers[core.X_B3_SAMPLED],
+          lastResponse.headers[X_B3_SAMPLED],
           undefined,
-          `trace header '${core.X_B3_SAMPLED}' should not be set`
+          `trace header '${X_B3_SAMPLED}' should not be set`
         );
       });
     });
diff --git a/packages/opentelemetry-plugin-xml-http-request/package.json b/packages/opentelemetry-plugin-xml-http-request/package.json
index 193bdb3391..5075e15c4d 100644
--- a/packages/opentelemetry-plugin-xml-http-request/package.json
+++ b/packages/opentelemetry-plugin-xml-http-request/package.json
@@ -46,6 +46,7 @@
   "devDependencies": {
     "@babel/core": "7.11.1",
     "@opentelemetry/context-zone": "^0.12.0",
+    "@opentelemetry/propagator-b3": "^0.12.0",
     "@opentelemetry/tracing": "^0.12.0",
     "@types/mocha": "8.0.2",
     "@types/node": "14.0.27",
diff --git a/packages/opentelemetry-plugin-xml-http-request/test/xhr.test.ts b/packages/opentelemetry-plugin-xml-http-request/test/xhr.test.ts
index 44c636d719..eb769068c8 100644
--- a/packages/opentelemetry-plugin-xml-http-request/test/xhr.test.ts
+++ b/packages/opentelemetry-plugin-xml-http-request/test/xhr.test.ts
@@ -15,16 +15,18 @@
  */
 import * as api from '@opentelemetry/api';
 import {
-  B3Propagator,
   LogLevel,
   otperformance as performance,
-  X_B3_SAMPLED,
-  X_B3_SPAN_ID,
-  X_B3_TRACE_ID,
   isWrapped,
   NoopLogger,
-  B3InjectEncoding,
 } from '@opentelemetry/core';
+import {
+  B3Propagator,
+  B3InjectEncoding,
+  X_B3_SAMPLED,
+  X_B3_SPAN_ID,
+  X_B3_TRACE_ID,
+} from '@opentelemetry/propagator-b3';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
 import * as tracing from '@opentelemetry/tracing';
 import { HttpAttribute } from '@opentelemetry/semantic-conventions';
diff --git a/packages/opentelemetry-propagator-b3/.eslintignore b/packages/opentelemetry-propagator-b3/.eslintignore
new file mode 100644
index 0000000000..378eac25d3
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/.eslintignore
@@ -0,0 +1 @@
+build
diff --git a/packages/opentelemetry-propagator-b3/.eslintrc.js b/packages/opentelemetry-propagator-b3/.eslintrc.js
new file mode 100644
index 0000000000..9dfe62f9b8
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/.eslintrc.js
@@ -0,0 +1,9 @@
+module.exports = {
+    "env": {
+        "mocha": true,
+        "commonjs": true,
+        "node": true,
+        "browser": true
+    },
+    ...require('../../eslint.config.js')
+}
diff --git a/packages/opentelemetry-propagator-b3/.npmignore b/packages/opentelemetry-propagator-b3/.npmignore
new file mode 100644
index 0000000000..9505ba9450
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/.npmignore
@@ -0,0 +1,4 @@
+/bin
+/coverage
+/doc
+/test
diff --git a/packages/opentelemetry-propagator-b3/LICENSE b/packages/opentelemetry-propagator-b3/LICENSE
new file mode 100644
index 0000000000..261eeb9e9f
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
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+   6. Trademarks. This License does not grant permission to use the trade
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+
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+
+      To apply the Apache License to your work, attach the following
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+      file or class name and description of purpose be included on the
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
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diff --git a/packages/opentelemetry-propagator-b3/README.md b/packages/opentelemetry-propagator-b3/README.md
new file mode 100644
index 0000000000..afb8f3f6e7
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/README.md
@@ -0,0 +1,172 @@
+# OpenTelemetry Propagator B3
+
+[![Gitter chat][gitter-image]][gitter-url]
+[![NPM Published Version][npm-img]][npm-url]
+[![dependencies][dependencies-image]][dependencies-url]
+[![devDependencies][devdependencies-image]][devdependencies-url]
+[![Apache License][license-image]][license-image]
+
+The OpenTelemetry b3 propagator package provides multiple propagator
+implementations for systems using the b3 context format. See the
+[b3 specification][b3-spec] for complete details.
+
+## B3 Formats
+
+Single-Header Format:
+
+```bash
+b3: {TraceId}-{SpanId}-{SamplingState}-{ParentSpanId}
+```
+
+Multi-Header Format:
+
+```bash
+X-B3-TraceId: {TraceId}
+X-B3-SpanId: {SpanId}
+X-B3-ParentSpanId: {ParentSpanId}
+X-B3-Sampled: {SamplingState}
+```
+
+- {TraceId}
+
+  - Required
+  - Encoded as 32 or 16 lower-hex characters
+  - 16 character traceIds will be converted to 32 characters by left-padding
+    with 0s to conform with the [OpenTelemetry specification][otel-spec-id-format]
+
+- {SpanId}
+
+  - Required
+  - Encoded as 16 lower-hex characters
+
+- {ParentSpanId}
+
+  - Optional
+  - Used to support the Zipkin functionality where the client and server spans
+    that make up an HTTP request share the same id
+  - Not propagated by this library
+
+- {SamplingState} - Single-header
+
+  - Optional
+  - Valid values
+    - 1 - Accept
+    - 0 - Deny
+    - d - Debug
+    - Absent - Defer sampling decision
+
+- {SamplingState} - Multi-header
+
+  - Optional
+  - Valid values
+    - 1 - Accept
+    - 0 - Deny
+
+- {Flags} - Multi-header
+  - Optional
+  - Debug is encoded as `X-B3-Flags`: 1. Absent or any other value can be ignored. Debug implies an accept decision, so don't also send the `X-B3-Sampled` header.
+
+## Propagator Implementations
+
+### B3Propagator
+
+The default `B3Propagator` implements b3 propagation according to the
+[OpenTelemetry specification][otel-b3-requirements]. It extracts b3 context
+from multi and single header encodings and injects context using the
+single-header b3 encoding. The inject encoding can be changed to multi-header
+via configuration.
+
+Example usage (default):
+
+```javascript
+const api = require('@opentelemetry/api');
+const { B3Propagator } = require('@opentelemetry/propagator-b3');
+
+api.propagation.setGlobalPropagator(new B3Propagator());
+```
+
+Example usage (specify inject encoding):
+
+```javascript
+const api = require('@opentelemetry/api');
+const { B3Propagator } = require('@opentelemetry/propagator-b3');
+
+api.propagation.setGlobalPropagator(
+  new B3Propagator({ injectEncoding: B3InjectEncoding.MULTI_HEADER })
+);
+```
+
+### B3SinglePropagator
+
+If a distributed system only needs support for the b3 single-header
+encoding it can use the `B3SinglePropagator` directly.
+
+Example usage:
+
+```javascript
+const api = require('@opentelemetry/api');
+const { B3SinglePropagator } = require('@opentelemetry/propagator-b3');
+
+api.propagation.setGlobalPropagator(new B3SinglePropagator());
+```
+
+### B3MultiPropagator
+
+If a distributed system only needs support for the b3 multi-header
+encoding it can use the `B3MultiPropagator` directly.
+
+Example usage:
+
+```javascript
+const api = require('@opentelemetry/api');
+const { B3MultiPropagator } = require('@opentelemetry/propagator-b3');
+
+api.propagation.setGlobalPropagator(new B3MultiPropagator());
+```
+
+### CompositePropagator
+
+If a distributed system needs to support both single and multiple header
+encodings for inject and extract the `B3SinglePropagator` and
+`B3MultiPropagator` can be used in conjunction with a `CompositePropagator`.
+
+Example usage:
+
+```javascript
+const api = require('@opentelemetry/api');
+const { CompositePropagator } = require('@opentelemetry/core');
+const {
+  B3SinglePropagator,
+  B3MultiPropagator,
+} = require('@opentelemetry/propagator-b3');
+
+api.propagation.setGlobalPropagator(
+  new CompositePropagator({
+    propagators: [new B3SinglePropagator(), new B3MultiPropagator()],
+  })
+);
+```
+
+## Useful links
+
+- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
+- For more about OpenTelemetry JavaScript: <https://github.com/open-telemetry/opentelemetry-js>
+- For help or feedback on this project, join us on [gitter][gitter-url]
+
+## License
+
+Apache 2.0 - See [LICENSE][license-url] for more information.
+
+[gitter-image]: https://badges.gitter.im/open-telemetry/opentelemetry-js.svg
+[gitter-url]: https://gitter.im/open-telemetry/opentelemetry-node?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+[license-url]: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/master/LICENSE
+[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
+[dependencies-image]: https://david-dm.org/open-telemetry/opentelemetry-js/status.svg?path=packages/opentelemetry-propagator-jaeger
+[dependencies-url]: https://david-dm.org/open-telemetry/opentelemetry-js?path=packages%2Fopentelemetry-propagator-jaeger
+[devdependencies-image]: https://david-dm.org/open-telemetry/opentelemetry-js/dev-status.svg?path=packages/opentelemetry-propagator-jaeger
+[devdependencies-url]: https://david-dm.org/open-telemetry/opentelemetry-js?path=packages%2Fopentelemetry-propagator-jaeger&type=dev
+[npm-url]: https://www.npmjs.com/package/@opentelemetry/propagator-jaeger
+[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fpropagator-jaeger.svg
+[b3-spec]: https://github.com/openzipkin/b3-propagation
+[otel-b3-requirements]: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/context/api-propagators.md#b3-requirements
+[otel-spec-id-format]: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/api.md#retrieving-the-traceid-and-spanid
diff --git a/packages/opentelemetry-propagator-b3/package.json b/packages/opentelemetry-propagator-b3/package.json
new file mode 100644
index 0000000000..149596873b
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/package.json
@@ -0,0 +1,61 @@
+{
+  "name": "@opentelemetry/propagator-b3",
+  "version": "0.12.0",
+  "description": "OpenTelemetry B3 propagator provides context propagation for systems that are using the B3 header format",
+  "main": "build/src/index.js",
+  "types": "build/src/index.d.ts",
+  "repository": "open-telemetry/opentelemetry-js",
+  "scripts": {
+    "test": "nyc ts-mocha -p tsconfig.json test/**/*.test.ts",
+    "codecov": "nyc report --reporter=json && codecov -f coverage/*.json -p ../../",
+    "build": "npm run compile",
+    "clean": "rimraf build/*",
+    "lint": "eslint . --ext .ts",
+    "lint:fix": "eslint . --ext .ts --fix",
+    "precompile": "tsc --version",
+    "version:update": "node ../../scripts/version-update.js",
+    "compile": "npm run version:update && tsc -p .",
+    "prepare": "npm run compile",
+    "watch": "tsc -w"
+  },
+  "keywords": [
+    "opentelemetry",
+    "nodejs",
+    "tracing",
+    "profiling",
+    "monitoring",
+    "b3"
+  ],
+  "author": "OpenTelemetry Authors",
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">=8.0.0"
+  },
+  "files": [
+    "build/src/**/*.js",
+    "build/src/**/*.js.map",
+    "build/src/**/*.d.ts",
+    "LICENSE",
+    "README.md"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@opentelemetry/api": "^0.12.0"
+  },
+  "devDependencies": {
+    "@opentelemetry/context-base": "^0.12.0",
+    "@types/mocha": "8.0.3",
+    "@types/node": "14.0.27",
+    "codecov": "3.7.2",
+    "gts": "2.0.2",
+    "istanbul-instrumenter-loader": "3.0.1",
+    "mocha": "7.2.0",
+    "nyc": "15.1.0",
+    "rimraf": "3.0.2",
+    "ts-loader": "8.0.4",
+    "ts-mocha": "7.0.0",
+    "typescript": "3.9.7"
+  }
+}
diff --git a/packages/opentelemetry-core/src/context/propagation/B3MultiPropagator.ts b/packages/opentelemetry-propagator-b3/src/B3MultiPropagator.ts
similarity index 98%
rename from packages/opentelemetry-core/src/context/propagation/B3MultiPropagator.ts
rename to packages/opentelemetry-propagator-b3/src/B3MultiPropagator.ts
index d93489d41d..007390a497 100644
--- a/packages/opentelemetry-core/src/context/propagation/B3MultiPropagator.ts
+++ b/packages/opentelemetry-propagator-b3/src/B3MultiPropagator.ts
@@ -26,7 +26,7 @@ import {
   TextMapSetter,
   TraceFlags,
 } from '@opentelemetry/api';
-import { B3_DEBUG_FLAG_KEY } from './b3-common';
+import { B3_DEBUG_FLAG_KEY } from './common';
 
 /* b3 multi-header keys */
 export const X_B3_TRACE_ID = 'x-b3-traceid';
diff --git a/packages/opentelemetry-core/src/context/propagation/B3Propagator.ts b/packages/opentelemetry-propagator-b3/src/B3Propagator.ts
similarity index 90%
rename from packages/opentelemetry-core/src/context/propagation/B3Propagator.ts
rename to packages/opentelemetry-propagator-b3/src/B3Propagator.ts
index a2b227f83d..8d5565589d 100644
--- a/packages/opentelemetry-core/src/context/propagation/B3Propagator.ts
+++ b/packages/opentelemetry-propagator-b3/src/B3Propagator.ts
@@ -22,17 +22,7 @@ import {
 } from '@opentelemetry/api';
 import { B3MultiPropagator } from './B3MultiPropagator';
 import { B3SinglePropagator, B3_CONTEXT_HEADER } from './B3SinglePropagator';
-
-/** Enumeraion of B3 inject encodings */
-export enum B3InjectEncoding {
-  SINGLE_HEADER,
-  MULTI_HEADER,
-}
-
-/** Configuration for the B3Propagator */
-export interface B3PropagatorConfig {
-  injectEncoding?: B3InjectEncoding;
-}
+import { B3InjectEncoding, B3PropagatorConfig } from './types';
 
 /**
  * Propagator that extracts B3 context in both single and multi-header variants,
diff --git a/packages/opentelemetry-core/src/context/propagation/B3SinglePropagator.ts b/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
similarity index 98%
rename from packages/opentelemetry-core/src/context/propagation/B3SinglePropagator.ts
rename to packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
index 53444a1da9..2a3a81656f 100644
--- a/packages/opentelemetry-core/src/context/propagation/B3SinglePropagator.ts
+++ b/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
@@ -26,7 +26,7 @@ import {
   TextMapSetter,
   TraceFlags,
 } from '@opentelemetry/api';
-import { B3_DEBUG_FLAG_KEY } from './b3-common';
+import { B3_DEBUG_FLAG_KEY } from './common';
 
 /** B3 single-header name */
 export const B3_CONTEXT_HEADER = 'b3';
diff --git a/packages/opentelemetry-core/src/context/propagation/b3-common.ts b/packages/opentelemetry-propagator-b3/src/common.ts
similarity index 100%
rename from packages/opentelemetry-core/src/context/propagation/b3-common.ts
rename to packages/opentelemetry-propagator-b3/src/common.ts
diff --git a/packages/opentelemetry-propagator-b3/src/index.ts b/packages/opentelemetry-propagator-b3/src/index.ts
new file mode 100644
index 0000000000..3fb23f4fda
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/src/index.ts
@@ -0,0 +1,20 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export * from './B3Propagator';
+export * from './B3SinglePropagator';
+export * from './B3MultiPropagator';
+export * from './types';
diff --git a/packages/opentelemetry-propagator-b3/src/types.ts b/packages/opentelemetry-propagator-b3/src/types.ts
new file mode 100644
index 0000000000..45dcce0b05
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/src/types.ts
@@ -0,0 +1,26 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/** Enumeration of B3 inject encodings */
+export enum B3InjectEncoding {
+  SINGLE_HEADER,
+  MULTI_HEADER,
+}
+
+/** Configuration for the B3Propagator */
+export interface B3PropagatorConfig {
+  injectEncoding?: B3InjectEncoding;
+}
diff --git a/packages/opentelemetry-propagator-b3/src/version.ts b/packages/opentelemetry-propagator-b3/src/version.ts
new file mode 100644
index 0000000000..707690f363
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/src/version.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// this is autogenerated file, see scripts/version-update.js
+export const VERSION = '0.12.0';
diff --git a/packages/opentelemetry-core/test/context/B3MultiPropagator.test.ts b/packages/opentelemetry-propagator-b3/test/B3MultiPropagator.test.ts
similarity index 97%
rename from packages/opentelemetry-core/test/context/B3MultiPropagator.test.ts
rename to packages/opentelemetry-propagator-b3/test/B3MultiPropagator.test.ts
index 97149b4b89..5866a3d262 100644
--- a/packages/opentelemetry-core/test/context/B3MultiPropagator.test.ts
+++ b/packages/opentelemetry-propagator-b3/test/B3MultiPropagator.test.ts
@@ -24,7 +24,6 @@ import {
 } from '@opentelemetry/api';
 import { ROOT_CONTEXT } from '@opentelemetry/context-base';
 import * as assert from 'assert';
-import { B3_DEBUG_FLAG_KEY } from '../../src/context/propagation/b3-common';
 import {
   B3MultiPropagator,
   X_B3_FLAGS,
@@ -32,8 +31,8 @@ import {
   X_B3_SAMPLED,
   X_B3_SPAN_ID,
   X_B3_TRACE_ID,
-} from '../../src/context/propagation/B3MultiPropagator';
-import { TraceState } from '../../src/trace/TraceState';
+} from '../src/B3MultiPropagator';
+import { B3_DEBUG_FLAG_KEY } from '../src/common';
 
 describe('B3MultiPropagator', () => {
   const b3Propagator = new B3MultiPropagator();
@@ -70,7 +69,20 @@ describe('B3MultiPropagator', () => {
         traceId: 'd4cda95b652f4a1592b449d5929fda1b',
         spanId: '6e0c63257de34c92',
         traceFlags: TraceFlags.NONE,
-        traceState: new TraceState('foo=bar,baz=qux'),
+        traceState: {
+          get: (key: string) => {
+            return undefined;
+          },
+          set: function (key: string, value: string) {
+            return this;
+          },
+          unset: function (key: string) {
+            return this;
+          },
+          serialize: () => {
+            return 'foo=bar,baz=quux';
+          },
+        },
         isRemote: false,
       };
 
diff --git a/packages/opentelemetry-core/test/context/B3Propagator.test.ts b/packages/opentelemetry-propagator-b3/test/B3Propagator.test.ts
similarity index 94%
rename from packages/opentelemetry-core/test/context/B3Propagator.test.ts
rename to packages/opentelemetry-propagator-b3/test/B3Propagator.test.ts
index 5964714bb8..67cd188f0b 100644
--- a/packages/opentelemetry-core/test/context/B3Propagator.test.ts
+++ b/packages/opentelemetry-propagator-b3/test/B3Propagator.test.ts
@@ -24,16 +24,14 @@ import {
   setExtractedSpanContext,
 } from '@opentelemetry/api';
 import { ROOT_CONTEXT } from '@opentelemetry/context-base';
-import {
-  B3Propagator,
-  B3InjectEncoding,
-} from '../../src/context/propagation/B3Propagator';
-import { B3_CONTEXT_HEADER } from '../../src/context/propagation/B3SinglePropagator';
+import { B3Propagator } from '../src/B3Propagator';
+import { B3InjectEncoding } from '../src/types';
+import { B3_CONTEXT_HEADER } from '../src/B3SinglePropagator';
 import {
   X_B3_SAMPLED,
   X_B3_SPAN_ID,
   X_B3_TRACE_ID,
-} from '../../src/context/propagation/B3MultiPropagator';
+} from '../src/B3MultiPropagator';
 
 describe('B3Propagator', () => {
   let propagator: B3Propagator;
diff --git a/packages/opentelemetry-core/test/context/B3SinglePropagator.test.ts b/packages/opentelemetry-propagator-b3/test/B3SinglePropagator.test.ts
similarity index 98%
rename from packages/opentelemetry-core/test/context/B3SinglePropagator.test.ts
rename to packages/opentelemetry-propagator-b3/test/B3SinglePropagator.test.ts
index 60fcf051f0..c45191031e 100644
--- a/packages/opentelemetry-core/test/context/B3SinglePropagator.test.ts
+++ b/packages/opentelemetry-propagator-b3/test/B3SinglePropagator.test.ts
@@ -26,11 +26,11 @@ import {
 } from '@opentelemetry/api';
 import { ROOT_CONTEXT } from '@opentelemetry/context-base';
 import * as assert from 'assert';
-import { B3_DEBUG_FLAG_KEY } from '../../src/context/propagation/b3-common';
 import {
   B3SinglePropagator,
   B3_CONTEXT_HEADER,
-} from '../../src/context/propagation/B3SinglePropagator';
+} from '../src/B3SinglePropagator';
+import { B3_DEBUG_FLAG_KEY } from '../src/common';
 
 describe('B3SinglePropagator', () => {
   const propagator = new B3SinglePropagator();
diff --git a/packages/opentelemetry-propagator-b3/tsconfig.json b/packages/opentelemetry-propagator-b3/tsconfig.json
new file mode 100644
index 0000000000..a2042cd68b
--- /dev/null
+++ b/packages/opentelemetry-propagator-b3/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../tsconfig.base",
+  "compilerOptions": {
+    "rootDir": ".",
+    "outDir": "build"
+  },
+  "include": [
+    "src/**/*.ts",
+    "test/**/*.ts"
+  ]
+}
diff --git a/packages/opentelemetry-web/package.json b/packages/opentelemetry-web/package.json
index e10ef5685b..2fa66276d4 100644
--- a/packages/opentelemetry-web/package.json
+++ b/packages/opentelemetry-web/package.json
@@ -45,6 +45,7 @@
   "devDependencies": {
     "@babel/core": "7.11.1",
     "@opentelemetry/context-zone": "^0.12.0",
+    "@opentelemetry/propagator-b3": "^0.12.0",
     "@opentelemetry/resources": "^0.12.0",
     "@types/jquery": "3.5.1",
     "@types/mocha": "8.0.2",
diff --git a/packages/opentelemetry-web/test/WebTracerProvider.test.ts b/packages/opentelemetry-web/test/WebTracerProvider.test.ts
index e10c80405c..00a3d2a6b9 100644
--- a/packages/opentelemetry-web/test/WebTracerProvider.test.ts
+++ b/packages/opentelemetry-web/test/WebTracerProvider.test.ts
@@ -17,7 +17,8 @@
 import { context } from '@opentelemetry/api';
 import { ContextManager } from '@opentelemetry/context-base';
 import { ZoneContextManager } from '@opentelemetry/context-zone';
-import { B3Propagator, BasePlugin, NoopLogger } from '@opentelemetry/core';
+import { BasePlugin, NoopLogger } from '@opentelemetry/core';
+import { B3Propagator } from '@opentelemetry/propagator-b3';
 import { Resource, TELEMETRY_SDK_RESOURCE } from '@opentelemetry/resources';
 import { Span, Tracer } from '@opentelemetry/tracing';
 import * as assert from 'assert';