derive changelog worker from release worker

Early versions of changelog entries may not have all the fields
required for the current transform.

2 files changed, 23 insertions, 2 deletions

diff --git a/python/fatcat_tools/workers/__init__.py b/python/fatcat_tools/workers/__init__.py
index 8bea7cdc..32fd330d 100644
--- a/python/fatcat_tools/workers/__init__.py
+++ b/python/fatcat_tools/workers/__init__.py
@@ -1,4 +1,4 @@
 
 from .changelog import ChangelogWorker, EntityUpdatesWorker
-from .elasticsearch import ElasticsearchReleaseWorker, ElasticsearchContainerWorker
+from .elasticsearch import ElasticsearchReleaseWorker, ElasticsearchContainerWorker, ElasticsearchChangelogWorker
 from .worker_common import most_recent_message, FatcatWorker
diff --git a/python/fatcat_tools/workers/elasticsearch.py b/python/fatcat_tools/workers/elasticsearch.py
index 68d6c304..525f372b 100644
--- a/python/fatcat_tools/workers/elasticsearch.py
+++ b/python/fatcat_tools/workers/elasticsearch.py
@@ -4,7 +4,7 @@ import time
 import requests
 from confluent_kafka import Consumer, KafkaException
 
-from fatcat_openapi_client import ReleaseEntity, ContainerEntity, ApiClient
+from fatcat_openapi_client import ReleaseEntity, ContainerEntity, ApiClient, ChangelogEntry
 from fatcat_tools import *
 from .worker_common import FatcatWorker
 
@@ -148,3 +148,24 @@ class ElasticsearchContainerWorker(ElasticsearchReleaseWorker):
         self.elasticsearch_document_name = "container"
         self.transform_func = container_to_elasticsearch
 
+
+class ElasticsearchChangelogWorker(ElasticsearchReleaseWorker):
+    """
+    Pulls changelog messages from Kafka, runs transformations and indexes them.
+
+    Note: Very early versions of changelog entries did not contain details
+    about the editor or extra fields.
+    """
+    def __init__(self, kafka_hosts, consume_topic, poll_interval=10.0, offset=None,
+            elasticsearch_backend="http://localhost:9200", elasticsearch_index="fatcat_changelog",
+            batch_size=200):
+        super().__init__(kafka_hosts=kafka_hosts,
+                         consume_topic=consume_topic)
+        self.consumer_group = "elasticsearch-updates3"
+        self.batch_size = batch_size
+        self.poll_interval = poll_interval
+        self.elasticsearch_backend = elasticsearch_backend
+        self.elasticsearch_index = elasticsearch_index
+        self.entity_type = ChangelogEntry
+        self.elasticsearch_document_name = "changelog"
+        self.transform_func = changelog_to_elasticsearch