TF_Graph* TF_NewGraph() { return new TF_Graph; }

void TF_DeleteGraph(TF_Graph* g) {
  if (g == nullptr) return;
  g->mu.lock();
  g->delete_requested = true;
  const bool del = g->sessions.empty();
  g->mu.unlock();
  if (del) delete g;
}

TF_Operation* TF_GraphOperationByName(TF_Graph* graph, const char* oper_name) {
  mutex_lock l(graph->mu);
  auto iter = graph->name_map.find(oper_name);

	if opts.Versioned {
		w.Header().Set(xhttp.AmzVersionID, objInfo.VersionID)
	}

	lastModified := objInfo.ModTime.UTC().Format(http.TimeFormat)
	w.Header().Set(xhttp.LastModified, lastModified)
	w.Header().Del(xhttp.ContentType)

	if _, ok := opts.ObjectAttributes[xhttp.Checksum]; ok {
		chkSums := objInfo.decryptChecksums(0)
		// AWS does not appear to append part number on this API call.
		switch {

		if err != nil {
			t.Fatalf("Test %d: Failed to create HTTP request for Put Object: <ERROR> %v", i+1, err)
		}
		// Removes auth header if test case requires it.
		if testCase.removeAuthHeader {
			req.Header.Del("Authorization")
		}
		switch testCase.fault {
		case malformedEncoding:
			req, err = malformChunkSizeSigV4(req, testCase.chunkSize-1)
		case signatureMismatch:
			req, err = malformDataSigV4(req, 'z')