Merge pull request 'Add new telemetry app' (#7) from dev/logger-implementation into main

Reviewed-on: #7

kitchen_counter/telemetry/__init__.py

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+#default_app_config = "telemetry.apps.TelemetryConfig"

kitchen_counter/telemetry/admin.py

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+from django.contrib import admin
+
+# Register your models here.

kitchen_counter/telemetry/apps.py

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+from django.apps import AppConfig
+import os
+import logging
+import multiprocessing
+from uuid import uuid4
+
+from opentelemetry import trace, metrics
+from opentelemetry._logs import set_logger_provider
+from opentelemetry.sdk.resources import Resource, SERVICE_INSTANCE_ID
+
+from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.sdk.trace.export import BatchSpanProcessor
+from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter
+
+from opentelemetry.sdk.metrics import MeterProvider
+from opentelemetry.sdk.metrics.export import PeriodicExportingMetricReader
+from opentelemetry.exporter.otlp.proto.grpc.metric_exporter import OTLPMetricExporter
+
+from opentelemetry.sdk._logs import LoggerProvider, LoggingHandler
+from opentelemetry.sdk._logs.export import BatchLogRecordProcessor
+from opentelemetry.exporter.otlp.proto.grpc._log_exporter import OTLPLogExporter
+from opentelemetry.instrumentation.django import DjangoInstrumentor
+
+class TelemetryConfig(AppConfig):
+    name = "telemetry"
+
+    def ready(self):
+        # Resource Definition
+        resource = Resource.create({
+            "service.name": "development-kitchen",
+            SERVICE_INSTANCE_ID: str(uuid4()),
+            "worker": os.getpid(),  # os.getpid() works outside Gunicorn too
+        })
+
+        endpoint = os.environ.get("OTEL_EXPORTER_OTLP_ENDPOINT", "http://129.159.229.69:4317")
+
+        # TRACE SETUP
+        if not isinstance(trace.get_tracer_provider(), TracerProvider):
+            tracer_provider = TracerProvider(resource=resource)
+            span_exporter = OTLPSpanExporter(endpoint=endpoint)
+            tracer_provider.add_span_processor(BatchSpanProcessor(span_exporter))
+            trace.set_tracer_provider(tracer_provider)
+
+        # METRIC SETUP
+        if not isinstance(metrics.get_meter_provider(), MeterProvider):
+            metric_reader = PeriodicExportingMetricReader(OTLPMetricExporter(endpoint=endpoint))
+            meter_provider = MeterProvider(resource=resource, metric_readers=[metric_reader])
+            metrics.set_meter_provider(meter_provider)
+
+        # LOGGING SETUP
+        # 1. Create and set the logger provider FIRST
+        logger_provider = LoggerProvider(resource=resource)
+        set_logger_provider(logger_provider)  # MUST be set before using LoggingHandler
+
+        # 2. Add processor and exporter
+        log_exporter = OTLPLogExporter(endpoint=endpoint)
+        logger_provider.add_log_record_processor(BatchLogRecordProcessor(log_exporter))
+
+        # 3. Now safely create the handler (uses global logger provider)
+        otel_handler = LoggingHandler(level=logging.INFO)
+
+        # 4. Attach to Django and root loggers
+        logging.getLogger("django").addHandler(otel_handler)
+        logging.getLogger("django").setLevel(logging.INFO)
+
+        logging.getLogger().addHandler(otel_handler)
+        logging.getLogger().setLevel(logging.INFO)
+        
+        
+        from opentelemetry.instrumentation.django import DjangoInstrumentor
+        DjangoInstrumentor().instrument()
+        
+        import sys
+        from .utils import PrintLogger  # assuming PrintLogger is defined in telemetry/utils.py
+
+        # Redirect print() and errors to logger so they appear in SigNoz
+        sys.stdout = PrintLogger(logging.INFO)
+        sys.stderr = PrintLogger(logging.ERROR)

kitchen_counter/telemetry/models.py

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+from django.db import models
+
+# Create your models here.

kitchen_counter/telemetry/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

kitchen_counter/telemetry/utils.py

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+import logging
+import sys
+
+class PrintLogger:
+    def __init__(self, level=logging.INFO):
+        self.logger = logging.getLogger("stdout_redirect")
+        self.level = level
+        self.terminal = sys.__stdout__  # Save original stdout
+
+    def write(self, message):
+        message = message.strip()
+        if message:  # avoid empty lines
+            self.logger.log(self.level, message)
+            self.terminal.write(message + '\n')  # Echo to terminal
+    def flush(self):
+        self.terminal.flush()

kitchen_counter/telemetry/views.py

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+from django.shortcuts import render
+
+# Create your views here.