download-images-graph.py

import os
import json
import requests

url = "http://131.114.88.8:3000/api/images"
path_file_json = os.getcwd()+"/images-graph.json"

page = 1                  # first page to be downloaed
limit = 1000             # number of images per page
payload = {'page': page, 'limit': limit}
images_graph = {}
images = []

res = requests.get(url, params=payload).json()
# "count":87570,"page":1,"limit":200,"pages":438,"images":
count = res['count']
pages = res['pages']

images_graph["num_nodes"] = count

print("{} number of images to download".format(count))
print("{} number of total pages".format(pages))

print("downloading...")
while page <= pages:
    payload = {'page': page, 'limit': limit}
    res = requests.get(url, params=payload).json()
    #print("downloading page {}".format(page))
    for image in res["images"]:
        images.append((image["name"], image["from_repo"]))

    page += 1

images_graph["edges"] = images

print("downloaed completed")
with open(path_file_json, 'w') as f:
    json.dump(images_graph, f, ensure_ascii=False)
    print("Saved into {} ".format(path_file_json))



with open(path_file_json) as json_data:
    images_graph = json.load(json_data)
    print(images_graph["num_nodes"])
    print(images_graph["edges"])

JSON structure

{
    "num_nodes": <num>,
   "edges": 
        [ 
          [node1, node-parent1], 
          [node2, node-parent2],
         ...
         ]
}

requirements.txt
requests==2.11.1