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# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License.
"""
An example to show an application using custom events. Events are added
to the span and exported via the AzureMonitorTraceExporter.
"""
# mypy: disable-error-code="attr-defined"
import os
from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from azure.monitor.opentelemetry.exporter import AzureMonitorTraceExporter
exporter = AzureMonitorTraceExporter.from_connection_string(os.environ["APPLICATIONINSIGHTS_CONNECTION_STRING"])
trace.set_tracer_provider(TracerProvider())
tracer = trace.get_tracer(__name__)
span_processor = BatchSpanProcessor(exporter)
trace.get_tracer_provider().add_span_processor(span_processor)
# Message events
with tracer.start_as_current_span("hello") as span:
span.add_event("Custom event", {"test": "attributes"})
print("Hello, World!")
# Exception events
try:
with tracer.start_as_current_span("hello") as span:
raise Exception("Custom exception message.")
except Exception:
print("Exception raised")
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