get_model_metadata_impl.cc

/* Copyright 2017 Google Inc. All Rights Reserved.
 
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
limitations under the License.
==============================================================================*/
 
#include "tensorflow_serving/servables/tensorflow/get_model_metadata_impl.h"
 
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
#include "tensorflow/cc/saved_model/loader.h"
#include "tensorflow/core/lib/core/errors.h"
#include "tensorflow_serving/core/servable_handle.h"
 
namespace tensorflow {
namespace serving {
 
namespace {
 
Status ValidateGetModelMetadataRequest(const GetModelMetadataRequest& request) {
  if (request.metadata_field_size() == 0) {
    return tensorflow::Status(
        static_cast<absl::StatusCode>(absl::StatusCode::kInvalidArgument),
        "GetModelMetadataRequest must specify at least one metadata_field");
  }
  for (const auto& metadata_field : request.metadata_field()) {
    if (metadata_field != GetModelMetadataImpl::kSignatureDef) {
      return tensorflow::errors::InvalidArgument(
          "Metadata field ", metadata_field, " is not supported");
    }
  }
  return absl::OkStatus();
}
 
Status SavedModelGetSignatureDef(ServerCore* core, const ModelSpec& model_spec,
                                 const GetModelMetadataRequest& request,
                                 GetModelMetadataResponse* response) {
  ServableHandle<SavedModelBundle> bundle;
  TF_RETURN_IF_ERROR(core->GetServableHandle(model_spec, &bundle));
  SignatureDefMap signature_def_map;
  for (const auto& signature : bundle->meta_graph_def.signature_def()) {
    (*signature_def_map.mutable_signature_def())[signature.first] =
        signature.second;
  }
  auto response_model_spec = response->mutable_model_spec();
  response_model_spec->set_name(bundle.id().name);
  response_model_spec->mutable_version()->set_value(bundle.id().version);
 
  (*response->mutable_metadata())[GetModelMetadataImpl::kSignatureDef].PackFrom(
      signature_def_map);
  return absl::OkStatus();
}
 
}  // namespace
 
constexpr const char GetModelMetadataImpl::kSignatureDef[];
 
Status GetModelMetadataImpl::GetModelMetadata(
    ServerCore* core, const GetModelMetadataRequest& request,
    GetModelMetadataResponse* response) {
  if (!request.has_model_spec()) {
    return tensorflow::Status(
        static_cast<absl::StatusCode>(absl::StatusCode::kInvalidArgument),
        "Missing ModelSpec");
  }
  return GetModelMetadataWithModelSpec(core, request.model_spec(), request,
                                       response);
}
 
Status GetModelMetadataImpl::GetModelMetadataWithModelSpec(
    ServerCore* core, const ModelSpec& model_spec,
    const GetModelMetadataRequest& request,
    GetModelMetadataResponse* response) {
  TF_RETURN_IF_ERROR(ValidateGetModelMetadataRequest(request));
  for (const auto& metadata_field : request.metadata_field()) {
    if (metadata_field == kSignatureDef) {
      TF_RETURN_IF_ERROR(
          SavedModelGetSignatureDef(core, model_spec, request, response));
    } else {
      return tensorflow::errors::InvalidArgument(
          "MetadataField ", metadata_field, " is not supported");
    }
  }
  return absl::OkStatus();
}
 
}  // namespace serving
}  // namespace tensorflow