From 0d2a1cf9c8078c27f02721196918d91bc4b32e3d Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Sun, 22 Oct 2023 22:18:31 +0800
Subject: add MongoDB to ClickHouse data migration script

---
 migration/mongodb_to_clickhouse.py | 54 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 migration/mongodb_to_clickhouse.py

diff --git a/migration/mongodb_to_clickhouse.py b/migration/mongodb_to_clickhouse.py
new file mode 100644
index 0000000..caf8424
--- /dev/null
+++ b/migration/mongodb_to_clickhouse.py
@@ -0,0 +1,54 @@
+#!/usr/bin/python3
+'''
+This script exports data from Blame MongoDB to TSV format.
+You can redirect the output to clickhouse-client to migrate to new Blame which uses ClickHouse.
+'''
+
+import uuid
+
+import pymongo
+
+from sys import stderr
+
+MG_URL = 'mongodb://@localhost:27017/'  # Change your credential here
+
+stdout = open(1, "w", buffering=1024 * 1024 * 1024)  # 1GB buffer, you can reduce this
+
+
+def read_mongo():
+    conn = pymongo.MongoClient(MG_URL)
+    table = conn['blame']['survival']
+    n = 0
+    for i, doc in enumerate(table.find()):
+        print(
+            doc['action_type'],
+            doc['game_version'],
+            doc['object_id'],
+            doc['object_pos']['world'],
+            int(doc['object_pos']['x']),
+            int(doc['object_pos']['y']),
+            int(doc['object_pos']['z']),
+            doc['object_type'],
+            doc['subject_id'],
+            doc['subject_pos']['world'],
+            doc['subject_pos']['x'],
+            doc['subject_pos']['y'],
+            doc['subject_pos']['z'],
+            uuid.UUID(bytes=doc['subject_uuid']),
+            doc['timestamp_millis'],
+            sep='\t',
+            file=stdout,
+        )
+        n += 1
+        if n == 10000:
+            print('Rows written:', i+1, file=stderr)
+            n = 0
+    print('OK', file=stderr)
+
+
+def main():
+    read_mongo()
+
+
+if __name__ == '__main__':
+    main()
-- 
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