serving.h

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/*
 * Copyright 2026 The A11 Authors
 *
 * 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.
 */
 
#ifndef A11_SERVICE_SERVING_H_
#define A11_SERVICE_SERVING_H_
 
#include <functional>
#include <memory>
#include <utility>
 
#include <absl/status/status.h>
 
#include "a11/concurrency/future.h"
#include "a11/service/service.h"
#include "a11/service/session.h"
 
namespace a11::service {
 
template <typename StreamT>
std::function<a11::Task(std::shared_ptr<StreamT>)> AcceptInto(
    const std::shared_ptr<Service>& service,
    StreamMode mode = StreamMode::kAccept) {
  std::weak_ptr<Service> weak = service;
  return [weak = std::move(weak),
          mode](std::shared_ptr<StreamT> stream) -> a11::Task {
    std::shared_ptr<Service> resolved = weak.lock();
    if (resolved == nullptr) {
      return a11::FailedTask(absl::FailedPreconditionError(
          "The service this server was bound to is gone"));
    }
    return resolved->Serve(std::move(stream), mode);
  };
}
 
}  // namespace a11::service
 
#endif  // A11_SERVICE_SERVING_H_