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utils/csv_processor.py
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253
utils/csv_processor.py
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# utils/csv_processor.py
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import pandas as pd
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import requests
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from io import StringIO
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from typing import Dict, Any, Optional
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from sqlalchemy.orm import Session
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from models.database_models import Product
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from datetime import datetime
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import logging
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logger = logging.getLogger(__name__)
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class CSVProcessor:
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"""Handles CSV import with robust parsing and batching"""
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ENCODINGS = ['utf-8', 'latin-1', 'iso-8859-1', 'cp1252', 'utf-8-sig']
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COLUMN_MAPPING = {
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# Standard variations
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'id': 'product_id',
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'ID': 'product_id',
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'Product ID': 'product_id',
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'name': 'title',
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'Name': 'title',
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'product_name': 'title',
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'Product Name': 'title',
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# Google Shopping feed standard
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'g:id': 'product_id',
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'g:title': 'title',
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'g:description': 'description',
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'g:link': 'link',
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'g:image_link': 'image_link',
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'g:availability': 'availability',
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'g:price': 'price',
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'g:brand': 'brand',
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'g:gtin': 'gtin',
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'g:mpn': 'mpn',
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'g:condition': 'condition',
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'g:adult': 'adult',
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'g:multipack': 'multipack',
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'g:is_bundle': 'is_bundle',
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'g:age_group': 'age_group',
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'g:color': 'color',
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'g:gender': 'gender',
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'g:material': 'material',
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'g:pattern': 'pattern',
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'g:size': 'size',
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'g:size_type': 'size_type',
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'g:size_system': 'size_system',
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'g:item_group_id': 'item_group_id',
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'g:google_product_category': 'google_product_category',
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'g:product_type': 'product_type',
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'g:custom_label_0': 'custom_label_0',
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'g:custom_label_1': 'custom_label_1',
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'g:custom_label_2': 'custom_label_2',
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'g:custom_label_3': 'custom_label_3',
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'g:custom_label_4': 'custom_label_4',
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# Handle complex shipping column
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'shipping(country:price:max_handling_time:min_transit_time:max_transit_time)': 'shipping'
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}
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def __init__(self):
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from utils.data_processing import GTINProcessor, PriceProcessor
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self.gtin_processor = GTINProcessor()
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self.price_processor = PriceProcessor()
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def download_csv(self, url: str) -> str:
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"""Download and decode CSV with multiple encoding attempts"""
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try:
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response = requests.get(url, timeout=30)
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response.raise_for_status()
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content = response.content
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# Try different encodings
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for encoding in self.ENCODINGS:
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try:
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decoded_content = content.decode(encoding)
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logger.info(f"Successfully decoded CSV with encoding: {encoding}")
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return decoded_content
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except UnicodeDecodeError:
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continue
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# Fallback with error ignoring
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decoded_content = content.decode('utf-8', errors='ignore')
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logger.warning("Used UTF-8 with error ignoring for CSV decoding")
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return decoded_content
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except requests.RequestException as e:
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logger.error(f"Error downloading CSV: {e}")
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raise
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def parse_csv(self, csv_content: str) -> pd.DataFrame:
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"""Parse CSV with multiple separator attempts"""
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parsing_configs = [
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# Try auto-detection first
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{'sep': None, 'engine': 'python'},
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# Try semicolon (common in European CSVs)
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{'sep': ';', 'engine': 'python'},
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# Try comma
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{'sep': ',', 'engine': 'python'},
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# Try tab
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{'sep': '\t', 'engine': 'python'},
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]
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for config in parsing_configs:
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try:
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df = pd.read_csv(
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StringIO(csv_content),
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on_bad_lines='skip',
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quotechar='"',
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skip_blank_lines=True,
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skipinitialspace=True,
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**config
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)
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logger.info(f"Successfully parsed CSV with config: {config}")
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return df
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except pd.errors.ParserError:
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continue
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raise pd.errors.ParserError("Could not parse CSV with any configuration")
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def normalize_columns(self, df: pd.DataFrame) -> pd.DataFrame:
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"""Normalize column names using mapping"""
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# Clean column names
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df.columns = df.columns.str.strip()
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# Apply mapping
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df = df.rename(columns=self.COLUMN_MAPPING)
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logger.info(f"Normalized columns: {list(df.columns)}")
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return df
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def process_row(self, row_data: Dict[str, Any]) -> Dict[str, Any]:
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"""Process a single row with data normalization"""
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# Handle NaN values
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processed_data = {k: (v if pd.notna(v) else None) for k, v in row_data.items()}
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# Process GTIN
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if processed_data.get('gtin'):
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processed_data['gtin'] = self.gtin_processor.normalize(processed_data['gtin'])
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# Process price and currency
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if processed_data.get('price'):
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parsed_price, currency = self.price_processor.parse_price_currency(processed_data['price'])
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processed_data['price'] = parsed_price
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processed_data['currency'] = currency
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# Process sale_price
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if processed_data.get('sale_price'):
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parsed_sale_price, _ = self.price_processor.parse_price_currency(processed_data['sale_price'])
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processed_data['sale_price'] = parsed_sale_price
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# Clean MPN (remove .0 endings)
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if processed_data.get('mpn'):
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mpn_str = str(processed_data['mpn']).strip()
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if mpn_str.endswith('.0'):
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processed_data['mpn'] = mpn_str[:-2]
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# Handle multipack type conversion
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if processed_data.get('multipack') is not None:
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try:
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processed_data['multipack'] = int(float(processed_data['multipack']))
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except (ValueError, TypeError):
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processed_data['multipack'] = None
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return processed_data
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async def process_csv_from_url(self, url: str, batch_size: int, db: Session) -> Dict[str, int]:
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"""Process CSV import with batching"""
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# Download and parse CSV
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csv_content = self.download_csv(url)
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df = self.parse_csv(csv_content)
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df = self.normalize_columns(df)
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logger.info(f"Processing CSV with {len(df)} rows")
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imported = 0
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updated = 0
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errors = 0
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# Process in batches
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for i in range(0, len(df), batch_size):
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batch_df = df.iloc[i:i + batch_size]
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batch_imported, batch_updated, batch_errors = self._process_batch(batch_df, db)
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imported += batch_imported
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updated += batch_updated
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errors += batch_errors
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# Commit batch
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try:
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db.commit()
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logger.info(
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f"Processed batch {i // batch_size + 1}: +{batch_imported} imported, +{batch_updated} updated, +{batch_errors} errors")
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except Exception as e:
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db.rollback()
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logger.error(f"Batch commit failed: {e}")
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errors += len(batch_df)
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return {
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"imported": imported,
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"updated": updated,
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"errors": errors,
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"total_processed": imported + updated + errors
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}
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def _process_batch(self, df_batch: pd.DataFrame, db: Session) -> tuple:
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"""Process a single batch of rows"""
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imported = 0
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updated = 0
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errors = 0
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for _, row in df_batch.iterrows():
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try:
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product_data = self.process_row(row.to_dict())
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# Validate required fields
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product_id = product_data.get('product_id')
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title = product_data.get('title')
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if not product_id or not title:
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errors += 1
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continue
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# Check for existing product
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existing_product = db.query(Product).filter(
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Product.product_id == product_id
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).first()
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if existing_product:
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# Update existing
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for key, value in product_data.items():
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if key not in ['id', 'created_at'] and hasattr(existing_product, key):
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setattr(existing_product, key, value)
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existing_product.updated_at = datetime.utcnow()
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updated += 1
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else:
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# Create new
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filtered_data = {k: v for k, v in product_data.items()
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if k not in ['id', 'created_at', 'updated_at'] and hasattr(Product, k)}
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new_product = Product(**filtered_data)
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db.add(new_product)
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imported += 1
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except Exception as e:
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logger.error(f"Error processing row: {e}")
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errors += 1
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return imported, updated, errors
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