178 lines
No EOL
7.4 KiB
Python
178 lines
No EOL
7.4 KiB
Python
import os
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import urllib.request
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import urllib.parse
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import re
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import time
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import random
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import datetime
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import json
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from threading import Thread
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import queue
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import tqdm
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directory_url = r"https://data.ngdc.noaa.gov/platforms/solar-space-observing-satellites/goes/"
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stored_images_dir = r"..\Data"
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# directory_url = r"https://data.ngdc.noaa.gov/platforms/solar-space-observing-satellites/goes/goes16/l2/data/suvi-l2-ci094/"
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# stored_images_dir = r"Z:\NOAA GOES Data\Data\goes16\l2\suvi-l2-ci094"
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ignore_folder_names = ["l1b", "goes17", "2017", "2018", "2019", "2020"]
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file_database_path = r"..\file_database.json"
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fetch_interval = 0 # 60*60
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nworkers = 8
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randomize_order = False
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def recursive_find_links(url, attempt_count = 3, randomize_order = True):
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links_regex_pattern = r'(?<=<a href=")([^ ?:]*)(?=">.*\d{4}-\d{2}-\d{2} \d{2}:\d{2})' # Find href links that do not contain question marks or whitespace
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times_regex_pattern = r'(?<=<td align="right">)(\d{4}-\d{2}-\d{2} \d{2}:\d{2})(?= )' # Find timestamps in UTC in the format YYYY-MM-DD HH:mm
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attempts = 0
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html_content = None
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while attempts < attempt_count:
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try:
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with urllib.request.urlopen(url) as response:
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html_content = response.read().decode('utf-8')
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break
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except Exception as e:
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print(f"Exception while fetching links: {e}")
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time.sleep(1 + random.random())
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attempts += 1
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if (attempt_count > 1) and (attempts == attempt_count):
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print(f'\nAfter {attempt_count} retries, could not fetch: {url}')
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return
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links = re.findall(links_regex_pattern, html_content)
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times = re.findall(times_regex_pattern, html_content)
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for i in range(len(times)):
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dt = datetime.datetime.strptime(times[i].strip(), "%Y-%m-%d %H:%M")
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dt.replace(tzinfo=datetime.timezone.utc)
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times[i] = time.mktime(dt.timetuple())
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if len(links) - 1 == len(times):
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links = links[1:]
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elif len(links) == len(times):
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pass
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else:
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raise(ValueError)
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results = list(zip(links, times))
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if randomize_order:
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random.shuffle(results)
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for _link, _time in results:
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if _link.endswith("/"):
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if _link.split(r"/")[-2] in ignore_folder_names:
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continue
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else:
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yield from recursive_find_links(urllib.parse.urljoin(url,_link), attempt_count, randomize_order)
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else:
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yield urllib.parse.urljoin(url,_link), _time
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# Fetch image from url and store it to path, retrying on failure
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def image_fetch_worker(work_queue, result_queue, attempt_count = 1):
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while True:
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job = work_queue.get()
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if job == None:
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return
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url, path, t = job
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attempts = 0
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while attempts < attempt_count:
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try:
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req = urllib.request.Request(url, data=None)
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image_data = urllib.request.urlopen(req).read()
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os.makedirs(os.path.split(path)[0], exist_ok=True)
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open(path, 'wb').write(image_data)
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result_queue.put((True, url, t))
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break
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except Exception as e:
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if hasattr(e, "code") and e.code == 404: # This is expected if the file has been removed from the site (at least for swpc.noaa.gov)
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attempts += attempt_count
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elif attempts == 0:
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print(f"\nA problem occurred on image: {url} | {e}")
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time.sleep(1 + random.random())
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attempts += 1
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if (attempt_count > 1) and (attempts == attempt_count):
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print(f'\nAfter {attempt_count} retries, could not fetch: {url}')
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result_queue.put((False, url, t))
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break
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if __name__ == "__main__":
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file_info_cache = {}
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try:
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print(f"Attempting to load file records from cache: {file_database_path}")
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with open(file_database_path, 'r') as f:
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file_info_cache = json.loads(f.read())
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print(f"File records loaded from cache: {len(file_info_cache)} records found.")
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except Exception as e:
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print(f"Load failed, starting with empty cache")
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file_info_cache = {}
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work_queue = queue.Queue(maxsize=nworkers)
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result_queue = queue.Queue()
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workers = []
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for _ in range(nworkers):
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t = Thread(target=image_fetch_worker, args=(work_queue, result_queue), daemon=True)
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t.start()
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workers.append(t)
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try:
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while True:
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fetched_image_count = 0
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already_had_image_count = 0
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failed_image_count = 0
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urllen = len(directory_url)
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for l, t in tqdm.tqdm(recursive_find_links(directory_url, randomize_order = randomize_order), desc="Downloading files"):
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# Collect completed jobs and record completion status
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while True:
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try:
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r_success, r_url, r_t = result_queue.get_nowait()
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if r_success:
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fetched_image_count += 1
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file_info_cache[r_url] = r_t
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else:
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failed_image_count += 1
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except queue.Empty:
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break
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# If we dont have the file or the file at the link is newer than the one we previously fetched
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if (not (l in file_info_cache)) or t > file_info_cache[l]:
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file_portion_of_link = l[urllen:]
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filepath = os.path.join(stored_images_dir, file_portion_of_link.replace("/", os.sep))
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if os.path.exists(filepath):
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if l in file_info_cache: # If we have record of this file, it must be out of date, rename it and download the new version.
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new_name = filepath + f"_{int(file_info_cache[l])}"
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if os.path.exists(new_name):
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os.remove(new_name)
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os.rename(filepath, new_name)
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else: # If we have no record of this file, update the file info cache and don't redownload
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file_info_cache[l] = t
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already_had_image_count += 1
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continue
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work_queue.put((l, filepath, t))
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else:
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already_had_image_count += 1
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with open(file_database_path, 'w') as f:
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f.write(json.dumps(file_info_cache))
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print(f"Downloaded {fetched_image_count} | Already had {already_had_image_count} | Failed {failed_image_count}")
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if fetch_interval > 0:
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print(f"Run complete!, sleeping for {fetch_interval} seconds.")
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with open(file_database_path, 'w') as f:
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f.write(json.dumps(file_info_cache))
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time.sleep(fetch_interval)
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else:
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print("Run complete!, exiting...")
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break
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except KeyboardInterrupt:
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print("Saving file database and shutting down.")
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for _ in range(nworkers):
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try:
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work_queue.put(None, timeout=5.0)
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except:
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break
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for w in workers:
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w.join(5.0)
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with open(file_database_path, 'w') as f:
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f.write(json.dumps(file_info_cache))
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print(f"Downloaded {fetched_image_count} | Already had {already_had_image_count} | Failed {failed_image_count}") |