This folder contains working demo projects that use pyo3-python-tracing-subscriber.

demo-py-project illustrates how a Python Layer implementation could incorporate Rust tracing data into another tracing system in Python. When a new Rust span is created, on_new_span() creates a corresponding PythonSpan and updates a global current_span variable. It then returns the a tuple containing the previous current_span (or, the parent span) and the new span to Rust to be stored inside the Rust span. When that Rust span is later closed, on_close() is given the same tuple containing the parent span and the span that is closing. It will set the global current_span variable back to the parent span.

To run it, run the following:

python -m venv .venv
source .venv/bin/activate
pip install -r demo-py-project/requirements.in

python demo-py-project/main.py

demo-sentry-project shows how to use the Sentry SDK's RustTracingIntegration to forward Rust tracing data to Sentry. It uses a custom event_type_mapping to show off exception/event/breadcrumb behavior; the default event_type_mapping is much less noisy.

To run it, run the following:

python -v venv .venv
source .venv/bin/activate
pip install -r demo-sentry-project/requirements.in

# Create a dummy Sentry project and get its DSN
export SENTRY_DSN=...
python demo-py-project/main.py
# See the results in the Issues and Traces section of your dummy project's Sentry page
# You may have to wait a few minutes for the transactions to be ingested

The demo-rust-extension folder contains a native extension built with maturin. It exposes two Rust functions to Python:

• initialize_tracing(), which takes a Python implementation of Layer
• fibonacci(), a Rust function with obnoxiously thorough instrumentation