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https://github.com/ferdzo/iotDashboard.git
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Migration to UV, introducing db_write, mqtt_ingestion, db_migrations, half working prototype.
This commit is contained in:
Andrej Mickov
281
services/db_write/main.py
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281
services/db_write/main.py
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"""
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Main entry point for the database writer service.
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Orchestrates the read → transform → write cycle with error handling.
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"""
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import logging
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import signal
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import sys
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import time
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import structlog
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from typing import List
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from config import config
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from redis_reader import RedisReader
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from db_writer import DatabaseWriter
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from schema import SchemaHandler, StreamMessage, SensorReading
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def configure_logging():
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"""Configure structured logging"""
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if config.log.format == 'json':
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structlog.configure(
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processors=[
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structlog.stdlib.filter_by_level,
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structlog.stdlib.add_logger_name,
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structlog.stdlib.add_log_level,
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structlog.stdlib.PositionalArgumentsFormatter(),
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structlog.processors.TimeStamper(fmt="iso"),
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structlog.processors.StackInfoRenderer(),
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structlog.processors.format_exc_info,
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structlog.processors.JSONRenderer()
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],
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wrapper_class=structlog.stdlib.BoundLogger,
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context_class=dict,
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logger_factory=structlog.stdlib.LoggerFactory(),
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cache_logger_on_first_use=True,
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)
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# Configure standard logging
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logging.basicConfig(
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level=getattr(logging, config.log.level.upper(), logging.INFO),
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format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
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)
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class DatabaseWriterService:
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"""Main service class that orchestrates the data pipeline"""
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def __init__(self):
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self.running = False
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self.redis_reader: RedisReader = None
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self.db_writer: DatabaseWriter = None
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self.schema_handler: SchemaHandler = None
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self.logger = logging.getLogger(__name__)
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# Setup signal handlers for graceful shutdown
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signal.signal(signal.SIGTERM, self._signal_handler)
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signal.signal(signal.SIGINT, self._signal_handler)
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# Statistics
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self.stats = {
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'messages_read': 0,
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'messages_written': 0,
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'messages_failed': 0,
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'batches_processed': 0,
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'errors': 0
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}
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def _signal_handler(self, signum, frame):
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"""Handle shutdown signals"""
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self.logger.info(f"Received signal {signum}, initiating graceful shutdown...")
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self.stop()
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def start(self) -> bool:
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"""Start the service"""
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self.logger.info("Starting Database Writer Service...")
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try:
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# Validate configuration
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config.validate()
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self.logger.info("Configuration validated successfully")
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# Initialize components
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self.schema_handler = SchemaHandler()
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self.logger.info("Schema handler initialized")
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self.redis_reader = RedisReader()
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self.logger.info("Redis reader initialized")
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self.db_writer = DatabaseWriter()
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self.logger.info("Database writer initialized")
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# Start the processing loop
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self.running = True
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self.logger.info("Service started successfully, entering processing loop")
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self._processing_loop()
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return True
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except Exception as e:
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self.logger.error(f"Service startup failed: {e}", exc_info=True)
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return False
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def _processing_loop(self):
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"""Main processing loop"""
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consecutive_errors = 0
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max_consecutive_errors = 5
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while self.running:
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try:
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# Read batch from Redis
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messages = self.redis_reader.read_batch()
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if not messages:
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# No messages, sleep briefly
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time.sleep(config.consumer.processing_interval_sec)
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continue
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self.stats['messages_read'] += len(messages)
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self.logger.debug(f"Read {len(messages)} messages from Redis")
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# Transform messages to sensor readings
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readings = self._transform_messages(messages)
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if not readings:
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self.logger.warning("No valid readings after transformation")
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# Acknowledge the messages anyway (they were invalid)
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self.redis_reader.acknowledge_batch(messages)
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continue
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# Write to database
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result = self.db_writer.write_batch(readings)
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if result.success:
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# Successfully written, acknowledge the messages
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ack_count = self.redis_reader.acknowledge_batch(messages)
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self.stats['messages_written'] += result.rows_written
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self.stats['batches_processed'] += 1
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consecutive_errors = 0
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self.logger.info(
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f"Processed batch: {result.rows_written} readings written, "
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f"{ack_count} messages acknowledged"
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)
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else:
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# Write failed, send to dead letter queue
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self.logger.error(f"Failed to write batch: {result.error}")
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self._handle_failed_batch(messages, result.error)
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self.stats['messages_failed'] += len(messages)
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self.stats['errors'] += 1
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consecutive_errors += 1
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# Check for too many consecutive errors
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if consecutive_errors >= max_consecutive_errors:
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self.logger.error(
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f"Too many consecutive errors ({consecutive_errors}), "
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"pausing for 30 seconds"
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)
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time.sleep(30)
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consecutive_errors = 0
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# Brief pause between batches
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if config.consumer.processing_interval_sec > 0:
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time.sleep(config.consumer.processing_interval_sec)
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except KeyboardInterrupt:
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self.logger.info("Keyboard interrupt received")
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break
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except Exception as e:
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self.logger.error(f"Error in processing loop: {e}", exc_info=True)
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self.stats['errors'] += 1
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consecutive_errors += 1
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time.sleep(5) # Back off on errors
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self.logger.info("Processing loop terminated")
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def _transform_messages(self, messages: List[StreamMessage]) -> List[SensorReading]:
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"""Transform stream messages to sensor readings"""
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readings = []
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for msg in messages:
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reading = self.schema_handler.transform_message(msg)
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if reading:
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readings.append(reading)
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else:
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self.logger.warning(
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f"Failed to transform message {msg.message_id} from {msg.stream_key}"
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)
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return readings
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def _handle_failed_batch(self, messages: List[StreamMessage], error: str):
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"""Handle a batch that failed to write to database"""
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# Send all messages to dead letter queue
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for msg in messages:
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self.redis_reader.send_to_dead_letter(msg, error)
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# Acknowledge them so they don't block the consumer group
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self.redis_reader.acknowledge_batch(messages)
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self.logger.warning(f"Sent {len(messages)} messages to dead letter queue")
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def stop(self):
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"""Stop the service gracefully"""
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if not self.running:
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return
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self.logger.info("Stopping service...")
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self.running = False
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# Print final statistics
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self.logger.info(
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f"Final statistics: "
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f"messages_read={self.stats['messages_read']}, "
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f"messages_written={self.stats['messages_written']}, "
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f"messages_failed={self.stats['messages_failed']}, "
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f"batches_processed={self.stats['batches_processed']}, "
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f"errors={self.stats['errors']}"
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)
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# Close connections
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if self.redis_reader:
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self.redis_reader.close()
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if self.db_writer:
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self.db_writer.close()
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self.logger.info("Service stopped")
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def health_check(self) -> dict:
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"""Check service health"""
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health = {
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'running': self.running,
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'redis': False,
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'database': False,
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'stats': self.stats
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}
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if self.redis_reader:
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health['redis'] = self.redis_reader.health_check()
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if self.db_writer:
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health['database'] = self.db_writer.health_check()
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return health
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def main():
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"""Entry point"""
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# Configure logging
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configure_logging()
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logger = logging.getLogger(__name__)
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logger.info("=" * 60)
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logger.info("Database Writer Service")
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logger.info(f"Consumer Group: {config.consumer.group_name}")
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logger.info(f"Consumer Name: {config.consumer.consumer_name}")
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logger.info(f"Batch Size: {config.consumer.batch_size}")
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logger.info(f"Stream Pattern: {config.stream.pattern}")
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logger.info("=" * 60)
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service = DatabaseWriterService()
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try:
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success = service.start()
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if not success:
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logger.error("Service failed to start")
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sys.exit(1)
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except KeyboardInterrupt:
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logger.info("Received keyboard interrupt")
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except Exception as e:
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logger.error(f"Unexpected error: {e}", exc_info=True)
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sys.exit(1)
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finally:
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service.stop()
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logger.info("Service exited")
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if __name__ == '__main__':
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main()
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