can you globally disable tracer via an environment variable?

[zhammer]

it'd be helpful for our local/test development environments if we could disable ddtrace globally via an environment variable.

i tried using DD_TRACE_ANALYTICS_ENABLED but that doesn't seem to do the trick

$ python -c "import ddtrace; print(ddtrace.tracer.enabled)"
True
$ DD_TRACE_ANALYTICS_ENABLED=false python -c "import ddtrace; print(ddtrace.tracer.enabled)"
True

also can't find any env var in the docs or from poking around the code here:

dd-trace-py/ddtrace/tracer.py

Line 114 in 3f8970e

enabled=True,

if it helps, our main requirement is that the traces aren't actually sent over network once done. it's still fine if the traces are instrumented locally!

[brettlangdon]

The only thing we have right now is DATADOG_TRACE_ENABLED but only available if you are using ddtrace-run.

dd-trace-py/ddtrace/commands/ddtrace_run.py

Line 27 in 3f8970e

DATADOG_TRACE_ENABLED=true|false : override the value of tracer.enabled (default: true)

It has been on my mental todo list to move this from ddtrace-run into ddtrace/tracer.py.

You could implement locally via something like:

import ddtrace
import os

ddtrace.tracer.enabled = bool(os.getenv("DATADOG_TRACE_ENABLED") != "false")

(ish)

[brettlangdon]

I'll official add a card to our backlog for this.

[zhammer]

great. yeah in these cases we're not running via ddtrace-run.

can help out with a PR if needed

[brettlangdon]

cool, it could be as easy as changing this line:

dd-trace-py/ddtrace/tracer.py

Line 114 in 3f8970e

enabled=True,

enabled=asbool(get_env("trace", "enabled', default=True))

[zhammer]

ha yeah that's what i was thinking :)

[maximillianus]

Ah sweet thread. I am also wondering how to disable tracing since DATADOG_TRACE_ENABLED env var does not seem being used in ddtrace library.

This info below not available in the latest version of ddtrace

dd-trace-py/ddtrace/commands/ddtrace_run.py

Line 27 in 3f8970e

DATADOG_TRACE_ENABLED=true|false : override the value of tracer.enabled (default: true)

This is the latest version:

dd-trace-py/ddtrace/commands/ddtrace_run.py

Lines 18 to 24 in a2d9f1b

	USAGE = """
	Execute the given Python program after configuring it to emit Datadog traces.
	Append command line arguments to your program as usual.
	Usage: ddtrace-run <my_program>
	""" # noqa: E501

Adding additional code below as mention by @brettlangdon above would be great for user who doesn't use ddtrace-run like me 🙂:

enabled=asbool(get_env("trace", "enabled', default=True))

[brettlangdon]

This has been resolved by #1575. Apologizes for not closing this issue sooner.

https://github.com/DataDog/dd-trace-py/blob/master/ddtrace/tracer.py#L143