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OpenTelemetry HTTPX Instrumentation

pypi

This library allows tracing HTTP requests made by the httpx library.

Installation

pip install opentelemetry-instrumentation-httpx

Usage

Instrumenting all clients

When using the instrumentor, all clients will automatically trace requests.

import httpx
from opentelemetry.instrumentation.httpx import HTTPXClientInstrumentor

url = "https://some.url/get"
HTTPXClientInstrumentor().instrument()

with httpx.Client() as client:
     response = client.get(url)

async with httpx.AsyncClient() as client:
     response = await client.get(url)

Instrumenting single clients

If you only want to instrument requests for specific client instances, you can use the instrument_client method.

import httpx
from opentelemetry.instrumentation.httpx import HTTPXClientInstrumentor

url = "https://some.url/get"

with httpx.Client(transport=telemetry_transport) as client:
    HTTPXClientInstrumentor.instrument_client(client)
    response = client.get(url)

async with httpx.AsyncClient(transport=telemetry_transport) as client:
    HTTPXClientInstrumentor.instrument_client(client)
    response = await client.get(url)

Uninstrument

If you need to uninstrument clients, there are two options available.

import httpx
from opentelemetry.instrumentation.httpx import HTTPXClientInstrumentor

HTTPXClientInstrumentor().instrument()
client = httpx.Client()

# Uninstrument a specific client
HTTPXClientInstrumentor.uninstrument_client(client)

# Uninstrument all clients
HTTPXClientInstrumentor().uninstrument()

Using transports directly

If you don't want to use the instrumentor class, you can use the transport classes directly.

import httpx
from opentelemetry.instrumentation.httpx import (
    AsyncOpenTelemetryTransport,
    SyncOpenTelemetryTransport,
)

url = "https://some.url/get"
transport = httpx.HTTPTransport()
telemetry_transport = SyncOpenTelemetryTransport(transport)

with httpx.Client(transport=telemetry_transport) as client:
    response = client.get(url)

transport = httpx.AsyncHTTPTransport()
telemetry_transport = AsyncOpenTelemetryTransport(transport)

async with httpx.AsyncClient(transport=telemetry_transport) as client:
    response = await client.get(url)

Request and response hooks

The instrumentation supports specifying request and response hooks. These are functions that get called back by the instrumentation right after a span is created for a request and right before the span is finished while processing a response.

Note

The request hook receives the raw arguments provided to the transport layer. The response hook receives the raw return values from the transport layer.

The hooks can be configured as follows:

from opentelemetry.instrumentation.httpx import HTTPXClientInstrumentor

def request_hook(span, request):
    # method, url, headers, stream, extensions = request
    pass

def response_hook(span, request, response):
    # method, url, headers, stream, extensions = request
    # status_code, headers, stream, extensions = response
    pass

async def async_request_hook(span, request):
    # method, url, headers, stream, extensions = request
    pass

async def async_response_hook(span, request, response):
    # method, url, headers, stream, extensions = request
    # status_code, headers, stream, extensions = response
    pass

HTTPXClientInstrumentor().instrument(
    request_hook=request_hook,
    response_hook=response_hook,
    async_request_hook=async_request_hook,
    async_response_hook=async_response_hook
)

Or if you are using the transport classes directly:

from opentelemetry.instrumentation.httpx import SyncOpenTelemetryTransport, AsyncOpenTelemetryTransport

def request_hook(span, request):
    # method, url, headers, stream, extensions = request
    pass

def response_hook(span, request, response):
    # method, url, headers, stream, extensions = request
    # status_code, headers, stream, extensions = response
    pass

async def async_request_hook(span, request):
    # method, url, headers, stream, extensions = request
    pass

async def async_response_hook(span, request, response):
    # method, url, headers, stream, extensions = request
    # status_code, headers, stream, extensions = response
    pass

transport = httpx.HTTPTransport()
telemetry_transport = SyncOpenTelemetryTransport(
    transport,
    request_hook=request_hook,
    response_hook=response_hook
)

async_transport = httpx.AsyncHTTPTransport()
async_telemetry_transport = AsyncOpenTelemetryTransport(
    async_transport,
    request_hook=async_request_hook,
    response_hook=async_response_hook
)

References