Move Debug and ServiceContainer middlewares into their own packages

- Implements From/Must accessors to facilitate context values retrieval

middleware/debug/debug.go

@@ -0,0 +1,42 @@
+package debug
+
+import (
+	"context"
+	"errors"
+
+	goweb "forge.cadoles.com/wpetit/goweb/middleware"
+	"github.com/go-chi/chi/middleware"
+)
+
+const (
+	// KeyDebug is the context key associated with the debug value
+	KeyDebug goweb.ContextKey = "debug"
+)
+
+// ErrInvalidDebug is returned when no debug value
+// could be found on the given context
+var ErrInvalidDebug = errors.New("invalid debug")
+
+// From retrieves the debug value from the given context
+func From(ctx context.Context) (bool, error) {
+	debug, ok := ctx.Value(KeyDebug).(bool)
+	if !ok {
+		return false, ErrInvalidDebug
+	}
+	return debug, nil
+}
+
+// Must retrieves the debug value from the given context or panics otherwise
+func Must(ctx context.Context) bool {
+	debug, err := From(ctx)
+	if err != nil {
+		panic(err)
+	}
+	return debug
+}
+
+// Debug expose the given debug flag as a context value
+// on the HTTP requests
+func Debug(debug bool) goweb.Middleware {
+	return middleware.WithValue(KeyDebug, debug)
+}

middleware/debug/debug_test.go

@@ -0,0 +1,22 @@
+package debug
+
+import (
+	"context"
+	"testing"
+)
+
+func TestContextDebug(t *testing.T) {
+
+	debug := false
+	ctx := context.WithValue(context.Background(), KeyDebug, debug)
+
+	dbg, err := From(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if dbg {
+		t.Fatal("debug should be false")
+	}
+
+}