opentelemetry-erlang-contrib/instrumentation/opentelemetry_oban/lib/opentelemetry_oban.ex

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defmodule OpentelemetryOban do
@moduledoc """
OpentelemetryOban uses [telemetry](https://hexdocs.pm/telemetry/) handlers to
create `OpenTelemetry` spans from Oban events.
Supported events include job start/stop and also when an exception is raised.
## Usage
In your application start:
def start(_type, _args) do
OpentelemetryOban.setup()
# ...
end
"""
alias Ecto.Changeset
alias OpenTelemetry.Span
require OpenTelemetry.Tracer
@doc """
Initializes and configures telemetry handlers.
By default jobs and plugins are traced. If you wish to trace only jobs then
use:
OpentelemetryOban.setup(trace: [:jobs])
Note that if you don't trace plugins, but inside the plugins, there are spans
from other instrumentation libraries (e.g. ecto) then these will still be
traced. This setting controls only the spans that are created by
opentelemetry_oban.
"""
@spec setup() :: :ok
def setup(opts \\ []) do
trace = Keyword.get(opts, :trace, [:jobs, :plugins])
if Enum.member?(trace, :jobs) do
OpentelemetryOban.JobHandler.attach()
end
if Enum.member?(trace, :plugins) do
OpentelemetryOban.PluginHandler.attach()
end
:ok
end
def insert(name \\ Oban, %Changeset{} = changeset) do
attributes = attributes_before_insert(changeset)
worker = Changeset.get_field(changeset, :worker, "unknown")
OpenTelemetry.Tracer.with_span "#{worker} send", attributes: attributes, kind: :producer do
changeset = add_tracing_information_to_meta(changeset)
case Oban.insert(name, changeset) do
{:ok, job} ->
OpenTelemetry.Tracer.set_attributes(attributes_after_insert(job))
{:ok, job}
other ->
other
end
end
end
def insert(name \\ Oban, multi, multi_name, changeset_or_fun) do
Oban.insert(name, multi, multi_name, changeset_or_fun)
end
def insert!(name \\ Oban, %Changeset{} = changeset) do
attributes = attributes_before_insert(changeset)
worker = Changeset.get_field(changeset, :worker, "unknown")
OpenTelemetry.Tracer.with_span "#{worker} send", attributes: attributes, kind: :producer do
changeset = add_tracing_information_to_meta(changeset)
try do
job = Oban.insert!(name, changeset)
OpenTelemetry.Tracer.set_attributes(attributes_after_insert(job))
job
rescue
exception ->
ctx = OpenTelemetry.Tracer.current_span_ctx()
Span.record_exception(ctx, exception, __STACKTRACE__)
Span.set_status(ctx, OpenTelemetry.status(:error, ""))
reraise exception, __STACKTRACE__
end
end
end
def insert_all(name \\ Oban, changesets_or_wrapper)
def insert_all(name, %{changesets: changesets}) when is_list(changesets) do
insert_all(name, changesets)
end
def insert_all(name, changesets) when is_list(changesets) do
# changesets in insert_all can include different workers and different
# queues. This means we cannot provide much information here, but we can
# still record the insert and propagate the context information.
OpenTelemetry.Tracer.with_span :"Oban bulk insert", kind: :producer do
changesets = Enum.map(changesets, &add_tracing_information_to_meta/1)
Oban.insert_all(name, changesets)
end
end
def insert_all(name \\ Oban, multi, multi_name, changesets_or_wrapper) do
Oban.insert_all(name, multi, multi_name, changesets_or_wrapper)
end
defp add_tracing_information_to_meta(changeset) do
meta = Changeset.get_field(changeset, :meta, %{})
new_meta =
[]
|> :otel_propagator_text_map.inject()
|> Enum.into(meta)
Changeset.change(changeset, %{meta: new_meta})
end
defp attributes_before_insert(changeset) do
queue = Changeset.get_field(changeset, :queue, "unknown")
worker = Changeset.get_field(changeset, :worker, "unknown")
%{
"messaging.system": :oban,
"messaging.destination": queue,
"messaging.destination_kind": :queue,
"messaging.oban.worker": worker
}
end
defp attributes_after_insert(job) do
%{
"messaging.oban.job_id": job.id,
"messaging.oban.priority": job.priority,
"messaging.oban.max_attempts": job.max_attempts
}
end
end