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perform_update.py
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perform_update.py
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#!/usr/bin/env python3
# -*- coding: utf8 -*-
"""
Update the changed data into the database file.
"""
from datetime import datetime
import json
import requests
import sqlite3
import configuration
# Connect to the database.
connection = sqlite3.connect(str(configuration.DATABASE_FILE))
cursor = connection.cursor()
# Get the current revision.
revision = list(
connection.execute(
"SELECT `revision` FROM `metadata` ORDER BY `revision` DESC LIMIT 1;"
)
)[0][0]
# Handle all changes.
count = 0
while True:
# Request the changelog.
url = (
"https://www.opencaching.de/okapi/services/replicate/changelog"
+ f"?since={revision}&consumer_key={configuration.OKAPI_KEY}"
)
data = requests.get(url).content
try:
json_data = json.loads(data)
except json.decoder.JSONDecodeError as error:
# If the content could not be parsed as JSON, print the content itself and
# stop by re-raising the exception afterwards.
print(f"Got JSON decode error when parsing JSON from {url}.")
print("Response content:")
print("=" * 80)
print(data)
print("=" * 80)
raise error
# Retrieve the main variables.
changelog = json_data["changelog"]
revision = json_data["revision"]
more = json_data["more"]
# Handle the changelog entries.
for entry in changelog:
# Only save geocaches.
if entry["object_type"] != "geocache":
continue
# Retrieve the basic entry data.
oc_code = entry["object_key"]["code"]
change_type = entry["change_type"]
if change_type == "delete":
# Create a deletion query.
query = "DELETE FROM `gc2oc` WHERE `ocCode` = ?;"
parameters = (oc_code,)
elif change_type == "replace":
# Create an update query.
query = "INSERT OR REPLACE INTO `gc2oc` (`ocCode`, `gcCode`) VALUES (?,?);"
data = entry["data"]
# Skip if this not an update regarding the GC code or the GC code is empty.
if "gc_code" not in data:
continue
gc_code = data["gc_code"]
# We might want to handle this in the future, but it should not do any real
# harm for now (at least within `cmanager`). There we are checking the
# other way round anyway before presenting the match itself.
if not gc_code:
continue
parameters = (oc_code, gc_code)
# Perform the query itself.
cursor.execute(query, parameters)
count += 1
# Break if we have no more updates.
if not more:
break
print(f"{count} elements have been updated.")
# Write the metadata.
generated_at = datetime.today().strftime("%Y-%m-%dT%H:%M:%S%z")
cursor.execute("DELETE FROM `metadata`;")
query = "INSERT INTO `metadata` (`revision`, `lastUpdateCheck`) VALUES (?,?);"
cursor.execute(query, (revision, generated_at))
# Commit the data.
connection.commit()
# Try to reduce the database size.
cursor.execute("VACUUM;")
connection.commit()
# Close the database connection.
connection.close()