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Another example of usage with some different properties #237
Description
While playing around with this - which is super helpful, thanks! - I came up with another approach than the current demos to meet my needs.
The benefits of this is that:
- No
otel-cli exec, so we can use bash functions - No
background, so we don't need to deal with the race issues - No
tp-carrierneeded either, which is not a big deal but avoids a lot of temporary files
Just wanted to share and didn't have a good way to do so, so I thought I would open an issue:
#!/bin/bash
export OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317
function gen-uid() {
tr -dc 'a-f0-9' < /dev/urandom | head -c$1
}
# Usage: trace <span name> [command ...]
function trace() {
# Throughout, "local" usage is critical to avoid nested calls overwriting things
local start="$(date -u +%s.%N)"
# First, get a trace and span ID. We need to get one now so we can propogate it to the child
# Get trace ID from TRACEPARENT, if present
local tid="$(<<<${TRACEPARENT:-} cut -d- -f2)"
tid="${tid:-"$(gen-uid 32)"}"
# Always generate a new span ID
local sid="$(gen-uid 16)"
# Execute the command they wanted with the propogation through TRACEPARENT
TRACEPARENT="00-${tid}-${sid}-01" "${@:2}"
local end="$(date -u +%s.%N)"
# Now report this span. We override the IDs to the ones we set before.
# TODO: support attributes
otel-cli span \
--service "test2" \
--name "$1" \
--start "$start" \
--end "$end" \
--force-trace-id "$tid" \
--force-span-id "$sid"
}
function nested() {
trace "child1" sleep .1
trace "child2" sleep .2
trace "deep" deep
}
function deep() {
trace "in-deep" sleep .1
}
trace "parent" nestedI am happy to close this immediately as an "FYI", send it to demos/, etc, whatever.
Reacted by Nahum Shalman, Matt Parsons and Aiman Ismail
Activity
howardjohn commentedon Jul 11, 2023
Actually got a bit carried away and wrote up a bunch of options: https://blog.howardjohn.info/posts/shell-tracing/
tobert commentedon Jul 11, 2023
I would love a PR to add this to demos! I'm also open to having an otel-cli command that dumps some shell code folks can source.