AoJ · August 18, 2022 11:58
diff --git a/otel-cli-ideas.sh b/otel-cli-ideas.sh
 #!/bin/bash
 # otel-cli-ideas.sh - some ideas I'm playing with for otel-cli to cover some
 # use cases where manual spans or exec don't quite do the trick
 #
 # another cool outcome is you could run this without the collector in some
 # cases without spamming your OTLP endpoint...
 #
 # I hope to OSS otel-cli under Apache 2 in early April 2021.

 # maybe it could background itself and wait for events on a unix socket?
 cf=$(mktemp) # carrier file, will be read/written
 sfd=$(mktemp -d) # socket file is a unix domain socket in this dir

 # start a span in the background, listening on a unix socket
 # it will hold the span open until it's ended or timeout
 otel-cli span background \
   --service-name $0 \
   --span-name "start a background span" \
   --tp-carrier $cf \
   --bg-socket-dir $sfd \
   --timeout 60 & # run as a background job
 # seems like most of the time you *don't* want to nohup this, but I
 # don't see why you couldn't, like in one use case I'm working on we
 # might start a span in initramfs and end it just before reboot...

 # later... add an event to that span
 # if a socket is provided, no need for the carrier, we can get that from
 # the socket
 otel-cli span event \
   --bg-socket-dir $sfd \
   --event-name "this is a span event" \
   --attrs "foo=bar,kernel=2.5.34-hahaharememberthat"

 # add a child span to the background span, but do not update carrier
 otel-cli span \
   --bg-socket-dir $sfd \
   --span-name "this is a child span on the background span"

 # add another child to the bg span, also background it
 inner_sfd=$(mktemp -d)
 otel-cli span background \
   --bg-socket-dir $inner_sfd \
   --span-name "child to the background" \
   --timeout 30 &

 # now we can add another span that's child to the child
 otel-cli span \
   --bg-socket-dir $inner_sfd \
   --span-name "3rd level child, inside two open spans"

 # now close up the background spans
 otel-cli span end --bg-socket-dir $inner_sfd
 otel-cli span end --bg-socket-dir $sfd
 # and/or
 kill $1
 kill $(otel-cli span background pid --bg-socket-dir $sfd)
	#!/bin/bash
	# otel-cli-ideas.sh - some ideas I'm playing with for otel-cli to cover some
	# use cases where manual spans or exec don't quite do the trick
	#
	# another cool outcome is you could run this without the collector in some
	# cases without spamming your OTLP endpoint...
	#
	# I hope to OSS otel-cli under Apache 2 in early April 2021.

	# maybe it could background itself and wait for events on a unix socket?
	cf=$(mktemp) # carrier file, will be read/written
	sfd=$(mktemp -d) # socket file is a unix domain socket in this dir

	# start a span in the background, listening on a unix socket
	# it will hold the span open until it's ended or timeout
	otel-cli span background \
	--service-name $0 \
	--span-name "start a background span" \
	--tp-carrier $cf \
	--bg-socket-dir $sfd \
	--timeout 60 & # run as a background job
	# seems like most of the time you don't want to nohup this, but I
	# don't see why you couldn't, like in one use case I'm working on we
	# might start a span in initramfs and end it just before reboot...

	# later... add an event to that span
	# if a socket is provided, no need for the carrier, we can get that from
	# the socket
	otel-cli span event \
	--bg-socket-dir $sfd \
	--event-name "this is a span event" \
	--attrs "foo=bar,kernel=2.5.34-hahaharememberthat"

	# add a child span to the background span, but do not update carrier
	otel-cli span \
	--bg-socket-dir $sfd \
	--span-name "this is a child span on the background span"

	# add another child to the bg span, also background it
	inner_sfd=$(mktemp -d)
	otel-cli span background \
	--bg-socket-dir $inner_sfd \
	--span-name "child to the background" \
	--timeout 30 &

	# now we can add another span that's child to the child
	otel-cli span \
	--bg-socket-dir $inner_sfd \
	--span-name "3rd level child, inside two open spans"

	# now close up the background spans
	otel-cli span end --bg-socket-dir $inner_sfd
	otel-cli span end --bg-socket-dir $sfd
	# and/or
	kill $1
	kill $(otel-cli span background pid --bg-socket-dir $sfd)