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main.py

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+import json
+import re
+import html
+import pyarrow as pa
+import pyarrow.parquet as pq
+import logging
+import time
+import sys
+
+OUTPUT = "./4chan.parquet"
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s | %(levelname)s | %(message)s")
+logger = logging.getLogger("4chan")
+
+def clean(text):
+    text = html.unescape(text)
+    text = re.sub(r'<a[^>]+class="quotelink"[^>]*>>>?\d+</a>', '', text)
+    text = re.sub(r'<span class="quote">&gt;(.*?)</span>', r'>\1', text)
+    text = re.sub(r'<wbr>', '', text)
+    text = re.sub(r'<br\s*/?>', '\n', text)
+    text = re.sub(r'<[^>]+>', '', text)
+    text = re.sub(r'\n{3,}', '\n\n', text)
+    return text.strip()
+
+schema = pa.schema([('system', pa.string()), ('user', pa.string())])
+writer = None
+systems = []
+users = []
+total_pairs = 0
+total_threads = 0
+start = time.time()
+
+for line in sys.stdin:
+    line = line.strip()
+    if not line:
+        continue
+
+    try:
+        thread = json.loads(line)
+    except json.JSONDecodeError:
+        continue
+
+    posts = thread.get('posts', [])
+    if len(posts) < 2:
+        continue
+
+    total_threads += 1
+    by_no = {p['no']: clean(p.get('com', '')) for p in posts}
+    op = posts[0]
+    op_text = clean(op.get('com', ''))
+
+    for post in posts[1:]:
+        com = post.get('com', '')
+        refs = re.findall(r'>>?(\d+)', html.unescape(com))
+        refs = [int(r) for r in refs if int(r) in by_no]
+
+        if refs:
+            for ref in refs:
+                systems.append(by_no[ref])
+                users.append(clean(com))
+        else:
+            systems.append(op_text)
+            users.append(clean(com))
+
+    if len(systems) >= 10_000:
+        batch = pa.record_batch([
+            pa.array(systems, type=pa.string()),
+            pa.array(users,   type=pa.string()),
+        ], schema=schema)
+
+        if writer is None:
+            writer = pq.ParquetWriter(OUTPUT, schema, compression='zstd', compression_level=3)
+            logger.info("Writer initialized")
+
+        writer.write_batch(batch)
+        total_pairs += len(systems)
+        systems.clear()
+        users.clear()
+
+        elapsed = time.time() - start
+        logger.info(f"Threads: {total_threads} | Pairs: {total_pairs} | Elapsed: {elapsed:.1f}s")
+
+if systems:
+    batch = pa.record_batch([
+        pa.array(systems, type=pa.string()),
+        pa.array(users,   type=pa.string()),
+    ], schema=schema)
+    if writer is None:
+        writer = pq.ParquetWriter(OUTPUT, schema, compression='zstd', compression_level=3)
+    writer.write_batch(batch)
+    total_pairs += len(systems)
+
+if writer:
+    writer.close()
+
+elapsed = time.time() - start
+logger.info(f"Done. Threads: {total_threads} | Total pairs: {total_pairs} | Time: {elapsed:.1f}s")