Getting values from parent context

pkg/handler/context.go

@@ -12,6 +12,7 @@ import (
 type httpContext struct {
 	context.Context
 
+	parentCtx context.Context
 	res       http.ResponseWriter
 	req       *http.Request
 	body      *bodyReader
@@ -19,9 +20,17 @@ type httpContext struct {
 
 func newContext(w http.ResponseWriter, r *http.Request) *httpContext {
 	return &httpContext{
-		Context: r.Context(),
+		Context:   context.Background(),
+		parentCtx: r.Context(),
 		res:       w,
 		req:       r,
 		body:      nil, // body can be filled later for PATCH requests
 	}
 }
+
+func (hctx *httpContext) Value(key interface{}) interface{} {
+	if v := hctx.Context.Value(key); v != nil {
+		return v
+	}
+	return hctx.parentCtx.Value(key)
+}

pkg/handler/context_test.go

@@ -0,0 +1,41 @@
+package handler
+
+import (
+	"context"
+	"errors"
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestContext(t *testing.T) {
+
+	t.Run("new context returns values from parent context", func(t *testing.T) {
+		parentCtx := context.WithValue(context.Background(), "test", "value")
+		req := http.Request{}
+		reqWithCtx := req.WithContext(parentCtx)
+		ctx := newContext(&httptest.ResponseRecorder{}, reqWithCtx)
+
+		ctxToTest := context.WithValue(ctx, "another", "testvalue")
+
+		a := assert.New(t)
+
+		a.Equal("testvalue", ctxToTest.Value("another"))
+		a.Equal("value", ctxToTest.Value("test"))
+	})
+
+	t.Run("parent context cancellation does not cancel the httpContext", func(t *testing.T) {
+		parentCtx := context.Background()
+		req := http.Request{}
+		reqWithCtx := req.WithContext(parentCtx)
+		ctx := newContext(&httptest.ResponseRecorder{}, reqWithCtx)
+
+		parentCtx.Done()
+
+		a := assert.New(t)
+
+		a.False(errors.Is(ctx.Err(), context.Canceled))
+	})
+
+}