setting up bluesky firehose

python/data_science/bluesky_transform.py

@@ -0,0 +1,143 @@
+"""Transform Bluesky Jetstream messages into rows matching the Posts table schema."""
+
+from __future__ import annotations
+
+import json
+import logging
+from datetime import datetime
+
+from python.data_science.bluesky_ids import (
+    did_to_user_id,
+    post_id_from_uri,
+    tid_to_integer,
+    user_id_from_uri,
+)
+
+logger = logging.getLogger(__name__)
+
+INSTANCE = "bsky"
+POST_COLLECTION = "app.bsky.feed.post"
+EMBED_RECORD_TYPE = "app.bsky.embed.record"
+EMBED_RECORD_WITH_MEDIA_TYPE = "app.bsky.embed.recordWithMedia"
+
+
+def transform_jetstream_post(message: dict) -> dict:
+    """Transform a Jetstream commit message into a dict matching Posts table columns.
+
+    Expects a Jetstream message with kind=commit, operation=create,
+    collection=app.bsky.feed.post.
+
+    Args:
+        message: The full Jetstream JSON message.
+
+    Returns:
+        A dict with keys matching the Posts table columns.
+    """
+    did = message["did"]
+    commit = message["commit"]
+    record = commit["record"]
+
+    row: dict = {
+        "post_id": tid_to_integer(commit["rkey"]),
+        "user_id": did_to_user_id(did),
+        "instance": INSTANCE,
+        "date": datetime.fromisoformat(record["createdAt"]),
+        "text": record.get("text", ""),
+        "langs": _extract_langs(record),
+        "like_count": 0,
+        "reply_count": 0,
+        "repost_count": 0,
+        "reply_to": None,
+        "replied_author": None,
+        "thread_root": None,
+        "thread_root_author": None,
+        "repost_from": None,
+        "reposted_author": None,
+        "quotes": None,
+        "quoted_author": None,
+        "labels": _extract_labels(record),
+        "sent_label": None,
+        "sent_score": None,
+    }
+
+    _extract_reply_refs(record, row)
+    _extract_quote_refs(record, row)
+
+    return row
+
+
+def is_post_create(message: dict) -> bool:
+    """Check if a Jetstream message is a post creation event.
+
+    Args:
+        message: The full Jetstream JSON message.
+
+    Returns:
+        True if this is a create commit for app.bsky.feed.post.
+    """
+    if message.get("kind") != "commit":
+        return False
+    commit = message.get("commit", {})
+    return commit.get("operation") == "create" and commit.get("collection") == POST_COLLECTION
+
+
+def _extract_langs(record: dict) -> str | None:
+    """Extract langs array as a JSON string, or None if absent."""
+    langs = record.get("langs")
+    if langs is None:
+        return None
+    return json.dumps(langs)
+
+
+def _extract_labels(record: dict) -> str | None:
+    """Extract self-labels as a JSON string, or None if absent."""
+    labels_obj = record.get("labels")
+    if labels_obj is None:
+        return None
+    values = labels_obj.get("values", [])
+    if not values:
+        return None
+    label_strings = [label.get("val", "") for label in values]
+    return json.dumps(label_strings)
+
+
+def _extract_reply_refs(record: dict, row: dict) -> None:
+    """Populate reply_to, replied_author, thread_root, thread_root_author from record.reply."""
+    reply = record.get("reply")
+    if reply is None:
+        return
+
+    parent = reply.get("parent", {})
+    parent_uri = parent.get("uri")
+    if parent_uri:
+        row["reply_to"] = post_id_from_uri(parent_uri)
+        row["replied_author"] = user_id_from_uri(parent_uri)
+
+    root = reply.get("root", {})
+    root_uri = root.get("uri")
+    if root_uri:
+        row["thread_root"] = post_id_from_uri(root_uri)
+        row["thread_root_author"] = user_id_from_uri(root_uri)
+
+
+def _extract_quote_refs(record: dict, row: dict) -> None:
+    """Populate quotes and quoted_author from embed record references."""
+    embed = record.get("embed")
+    if embed is None:
+        return
+
+    embed_type = embed.get("$type", "")
+
+    if embed_type == EMBED_RECORD_TYPE:
+        _set_quote_from_record(embed.get("record", {}), row)
+    elif embed_type == EMBED_RECORD_WITH_MEDIA_TYPE:
+        inner_record = embed.get("record", {}).get("record", {})
+        _set_quote_from_record(inner_record, row)
+
+
+def _set_quote_from_record(record_ref: dict, row: dict) -> None:
+    """Set quotes and quoted_author from a record reference object."""
+    uri = record_ref.get("uri")
+    if uri and POST_COLLECTION in uri:
+        row["quotes"] = post_id_from_uri(uri)
+        row["quoted_author"] = user_id_from_uri(uri)