fetch.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_NET_HTTP_FETCH_H_
#define A11_NET_HTTP_FETCH_H_
 
#include <cstdint>
#include <functional>
#include <string>
#include <string_view>
 
#include <absl/status/status.h>
#include <absl/time/time.h>
 
#include "a11/concurrency/future.h"
#include "a11/net/http2.h"
 
namespace a11::net {
 
using OnFetchProgress =
    std::function<void(std::uint64_t bytes_done, std::uint64_t bytes_total)>;
 
using FetchSink = std::function<absl::Status(std::string_view chunk)>;
 
struct FetchOptions {
  std::string method = "GET";  
  HttpHeaders headers;         
  std::string body;            
  int max_redirects = 5;
  absl::Duration timeout = absl::Minutes(5);
  Http2Options transport;
  bool default_user_agent = true;
 
  absl::Status Validate() const;
};
 
a11::Future<HttpResponse> Fetch(std::string url, FetchOptions options = {});
 
a11::Future<HttpResponseHead> FetchToSink(std::string url, FetchSink sink,
                                          FetchOptions options = {},
                                          OnFetchProgress on_progress = {});
 
namespace internal {
 
absl::StatusOr<HttpResponseHead> FetchBlocking(
    std::string url, FetchOptions options, const FetchSink& sink,
    const OnFetchProgress& on_progress = {});
 
}  // namespace internal
 
}  // namespace a11::net
 
#endif  // A11_NET_HTTP_FETCH_H_