http/get_simple/cpp/client/client.cpp

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 <curl/curl.h>
#include <arrow/api.h>
#include <arrow/io/api.h>
#include <arrow/ipc/api.h>
#include <chrono>

static size_t
WriteFunction(void *contents, size_t size, size_t nmemb, void *userp)
{
  size_t real_size = size * nmemb;
  auto decoder = static_cast<arrow::ipc::StreamDecoder*>(userp);
  if (decoder->Consume(static_cast<const uint8_t*>(contents), real_size).ok()) {
    return real_size;
  } else {
    return 0;
  }
}

int main(void)
{
  std::string url = "http://localhost:8008";

  CURL *curl_handle;
  CURLcode res;

  // We use arrow::ipc::CollectListner() here for simplicity,
  // but another option is to process decoded record batches
  // as a stream by overriding arrow::ipc::Listener().
  auto collect_listener = std::make_shared<arrow::ipc::CollectListener>();
  arrow::ipc::StreamDecoder decoder(collect_listener);

  curl_global_init(CURL_GLOBAL_ALL);
  curl_handle = curl_easy_init();

  curl_easy_setopt(curl_handle, CURLOPT_URL, url.c_str());
  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteFunction);
  curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, &decoder);
 
  auto start_time = std::chrono::steady_clock::now();

  res = curl_easy_perform(curl_handle);

  printf("%lld record batches received\n", collect_listener->num_record_batches());

  auto end_time = std::chrono::steady_clock::now();

  auto time_duration = std::chrono::duration_cast<std::chrono::duration<double>>(end_time - start_time);
  printf("%.2f seconds elapsed\n", time_duration.count());

  curl_easy_cleanup(curl_handle);
  curl_global_cleanup();

  std::vector<std::shared_ptr<arrow::RecordBatch>> record_batches;
  record_batches = collect_listener->record_batches();
 
  return 0;
}