Add Telegram transformer for channel info

cisticola/base.py

@@ -114,6 +114,49 @@ class RawChannelInfo:
     #: Datetime (relative to UTC) that the scraped post was archived at.
     date_archived: datetime
 
+@dataclass
+class ChannelInfo:
+    """A processed set of information about a channel.
+    """
+
+    # Foreign key from the raw_channel_info table
+    raw_channel_info_id: int
+
+    # Foreign ckey from the channels table
+    channel: int
+
+    # platform specific ID of the channel
+    platform_id: str
+
+    #: Name of platform from which result was scraped, e.g. ``"Twitter"``.
+    platform: str
+
+    #: String specifying name and version of scraper used to generate result, e.g. ``"TwitterScraper 0.0.1"``.
+    scraper: str
+
+    #: String specifying name and version of transformer used to tranform result, e.g. ``"TwitterTransformer 0.0.1"``.
+    transformer: str
+
+    #: attributes extracted from the raw channel info object
+    screenname: str
+    name: str
+    description: str
+    description_url: str
+    description_location: str
+    followers: int
+    following: int
+    verified: bool
+    date_created: datetime
+
+    #: Datetime (relative to UTC) that the scraped channel info was archived at.
+    date_archived: datetime
+    
+    #: Datetime (UTC) that the scraped channel info was transformed at.
+    date_transformed: datetime
+
+    def hydrate(self):
+        pass
+
 nlp_en = spacy.load('en_core_web_sm', disable=['parser', 'tok2vec', 'attribute_ruler'])
 nlp_de = spacy.load('de_core_news_sm', disable=['parser', 'tok2vec', 'attribute_ruler'])
 nlp_it = spacy.load('it_core_news_sm', disable=['parser', 'tok2vec', 'attribute_ruler'])
@@ -349,6 +392,23 @@ raw_channel_info_table = Table('raw_channel_info', mapper_registry.metadata,
                     Column('raw_data', String),
                     Column('date_archived', DateTime, index=True))
 
+channel_info_table = Table('channel_info', mapper_registry.metadata,
+                    Column('id', Integer, primary_key=True, autoincrement=True),
+                    Column('raw_channel_info_id', Integer, ForeignKey('raw_channel_info.id'), index=True),
+                    Column('channel', Integer, ForeignKey('channels.id'), index=True),
+                    Column('screenname', String),
+                    Column('name', String),
+                    Column('description', String),
+                    Column('description_url', String),
+                    Column('description_location', String),
+                    Column('followers', Integer),
+                    Column('following', Integer),
+                    Column('verified', Boolean),
+                    Column('date_created', DateTime),
+                    Column('date_archived', DateTime, index=True),
+                    Column('date_transformed', DateTime, index=True)
+                    )
+
 channel_table = Table('channels', mapper_registry.metadata,
                     Column('id', Integer, primary_key=True, autoincrement=True),
                     Column('name', String),
@@ -406,6 +466,7 @@ mapper_registry.map_imperatively(Post, post_table)
 mapper_registry.map_imperatively(Channel, channel_table)
 mapper_registry.map_imperatively(ScraperResult, raw_posts_table)
 mapper_registry.map_imperatively(RawChannelInfo, raw_channel_info_table)
+mapper_registry.map_imperatively(ChannelInfo, channel_info_table)
 mapper_registry.map_imperatively(Media, media_table, polymorphic_on='type', polymorphic_identity='media')
 mapper_registry.map_imperatively(Image, media_table, inherits=Media, polymorphic_on='type', polymorphic_identity='image')
 mapper_registry.map_imperatively(Video, media_table, inherits=Media, polymorphic_on='type', polymorphic_identity='video')

cisticola/transformer/base.py

@@ -6,7 +6,7 @@ from sqlalchemy.sql.expression import func
 from collections import defaultdict
 from datetime import datetime
 
-from cisticola.base import ScraperResult, Post, Media, Channel, mapper_registry
+from cisticola.base import RawChannelInfo, ChannelInfo, ScraperResult, Post, Media, Channel, mapper_registry
 
 
 class Transformer:
@@ -194,27 +194,71 @@ class ETLController:
         batch = []
 
         query = (session.query(ScraperResult)
-            # .filter_by(platform="Telegram")
-            # .filter(ScraperResult.raw_data.notlike("%MessageService%"))
             .join(Post, isouter=True)
             .where(Post.raw_id == None)
-            # .order_by(func.random())
             .order_by(ScraperResult.date.asc())
         )
 
         while len(batch) > 0 or offset == 0:
-            logger.info(f"Fetching untransformed batch of {BATCH_SIZE}, offset {offset}")
+            logger.info(f"Fetching untransformed posts batch of {BATCH_SIZE}, offset {offset}")
 
             batch = query.slice(offset, offset + BATCH_SIZE).all()
-            # untransformed = (
-                
-            #     .limit(BATCH_SIZE)
-            #     .offset(offset)
-            #     .all()
-            # )
-            
             offset += BATCH_SIZE
 
             logger.info(f"Found {len(batch)} items to ETL ({offset} already processed)")
 
             self.transform_results(batch, hydrate=hydrate)
+
+    @logger.catch(reraise=True)
+    def transform_info(self, results: List[ChannelInfo]):
+        if self.session is None:
+            logger.error("No DB session")
+            return
+
+        session = self.session()
+
+        for result in results:
+            if result.scraper is not None and result.platform is not None:
+                for transformer in self.transformers:
+                    handled = False
+
+                    if transformer.can_handle(result):
+                        logger.trace(f"{transformer} is handling raw info result {result.id} ({result.date})")
+                        handled = True
+
+                        transformer.transform(result, lambda obj: self.insert_or_select(obj, session, False), session)
+
+                        session.commit()
+                        break
+
+                    if handled == False:
+                        logger.warning(f"No Transformer could handle raw channel info ID {result.id} with platform {result.platform} ({result.date})")
+
+
+    @logger.catch(reraise=True)
+    def transform_all_untransformed_info(self):
+        if self.session is None:
+            logger.error("No DB session")
+            return
+
+        session = self.session()
+
+        BATCH_SIZE = 50000
+        offset = 0
+        batch = []
+
+        query = (session.query(RawChannelInfo)
+            .join(ChannelInfo, isouter=True)
+            .where(ChannelInfo.raw_channel_info_id == None)
+            .order_by(RawChannelInfo.date_archived.asc())
+        )
+
+        while len(batch) > 0 or offset == 0:
+            logger.info(f"Fetching untransformed info batch of {BATCH_SIZE}, offset {offset}")
+
+            batch = query.slice(offset, offset + BATCH_SIZE).all()
+            offset += BATCH_SIZE
+
+            logger.info(f"Found {len(batch)} info items to ETL ({offset} already processed)")
+
+            self.transform_info(batch)

cisticola/transformer/telegram_telethon.py

@@ -12,7 +12,7 @@ import os
 from datetime import datetime, timezone
 
 from cisticola.transformer.base import Transformer 
-from cisticola.base import ScraperResult, Post, Image, Video, Media, Channel
+from cisticola.base import RawChannelInfo, ChannelInfo, ScraperResult, Post, Image, Video, Media, Channel
 
 
 class TelegramTelethonTransformer(Transformer):
@@ -88,6 +88,33 @@ class TelegramTelethonTransformer(Transformer):
 
         return name
 
+    def transform_info(self, data: RawChannelInfo, insert: Callable, session) -> Generator[Union[Post, Channel, Media], None, None]:
+        raw = json.loads(data.raw_data)
+
+        chat_raw = raw['chats'][0]
+
+        transformed = ChannelInfo(
+            raw_channel_info_id=data.id,
+            channel=data.channel,
+            platform_id=raw['full_chat']['id'],
+            platform=data.platform,
+            scraper=data.scraper,
+            transformer=data.transformer,
+            screenname=chat_raw['username'],
+            name=chat_raw['title'],
+            description=raw['full_chat']['about'],
+            description_url='', # does not exist for Telegram
+            description_location='', # does not exist for Telegram
+            followers=raw['full_chat']['participants_count'],
+            following=-1, # does not exist for Telegram
+            verified=False, #does not exist for Telegram
+            date_created=dateutil.parser.parse(chat_raw['date']),
+            date_archived=data.date_archived,
+            date_transformed=datetime.now(timezone.utc)
+        )
+
+        transformed = insert(transformed)
+
     def transform(self, data: ScraperResult, insert: Callable, session) -> Generator[Union[Post, Channel, Media], None, None]:
         raw = json.loads(data.raw_data)