Baggage Interface and explicit accept list Implementation for HTTP and gRPC middleware (#210)

* Adds MallocNanoZone=0 env var as race detector run fails on OS X Monterey otherwise
* adds first implementation of baggage handling for grpc and http middlewares
* adds baggage implementation unit tests
* adds baggage integration test with grpc
* bumps license headers copyright year

Co-authored-by: Crypt Keeper <[email protected]>

Author: basvanbeek

Makefile

@@ -1,4 +1,4 @@
-# Copyright 2021 The OpenZipkin Authors
+# Copyright 2022 The OpenZipkin Authors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,7 +16,8 @@
 
 .PHONY: test
 test:
-	go test -v -race -cover ./...
+	# MallocNanoZone env var avoids problems in macOS Monterey: golang/go#49138
+	MallocNanoZone=0 go test -v -race -cover ./...
 
 .PHONY: bench
 bench:
@@ -25,8 +26,8 @@ bench:
 .PHONY: protoc
 protoc:
 	protoc --go_out=module=github.com/openzipkin/zipkin-go:. proto/zipkin_proto3/zipkin.proto
-	protoc --go_out=module=github.com/openzipkin/zipkin-go:. proto/testing/service.proto
-	protoc --go-grpc_out=module=github.com/openzipkin/zipkin-go:. proto/testing/service.proto
+	protoc --go_out=module=github.com/openzipkin/zipkin-go:. proto/testing/*.proto
+	protoc --go-grpc_out=module=github.com/openzipkin/zipkin-go:. proto/testing/*.proto
 
 .PHONY: lint
 lint:

README.md

@@ -1,5 +1,5 @@
 <!--
-Copyright 2021 The OpenZipkin Authors
+Copyright 2022 The OpenZipkin Authors
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

bench_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

context.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@ package zipkin
 
 import (
 	"context"
+
+	"github.com/openzipkin/zipkin-go/model"
 )
 
 var defaultNoopSpan = &noopSpan{}
@@ -47,6 +49,15 @@ func NewContext(ctx context.Context, s Span) context.Context {
 	return context.WithValue(ctx, spanKey, s)
 }
 
+// BaggageFromContext takes a context and returns access to BaggageFields if
+// available. Returns nil if there are no BaggageFields found in context.
+func BaggageFromContext(ctx context.Context) model.BaggageFields {
+	if span := SpanFromContext(ctx); span != nil {
+		return span.Context().Baggage
+	}
+	return nil
+}
+
 type ctxKey struct{}
 
 var spanKey = ctxKey{}

context_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

doc.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

endpoint.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

endpoint_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

example_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

examples/httpserver_test.go

@@ -1,4 +1,4 @@
-// Copyright 2021 The OpenZipkin Authors
+// Copyright 2022 The OpenZipkin Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.