Process propagator library (#64)
* Process propagator library * Fix Elixir API * CI files * Update propagators/opentelemetry_process_propagator/lib/opentelemetry_process_propagator.ex Co-authored-by: Andrew Rosa <dev@andrewhr.io> * Update propagators/opentelemetry_process_propagator/lib/opentelemetry_process_propagator.ex Co-authored-by: Andrew Rosa <dev@andrewhr.io> * format Co-authored-by: Andrew Rosa <dev@andrewhr.io>
This commit is contained in:
Bryan Naegele
GitHub
parent
2a25aab6d1
commit
7a5802cb14
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@ -53,14 +53,17 @@ opentelemetry_cowboy:
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opentelemetry_ecto:
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opentelemetry_ecto:
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- instrumentation/opentelemetry_ecto/**/*
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- instrumentation/opentelemetry_ecto/**/*
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opentelemetry_oban:
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- instrumentation/opentelemetry_oban/**/*
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opentelemetry_phoenix:
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opentelemetry_phoenix:
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- instrumentation/opentelemetry_phoenix/**/*
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- instrumentation/opentelemetry_phoenix/**/*
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opentelemetry_process_propagator:
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- propagators/opentelemetry_process_propagator/**/*
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opentelemetry_redix:
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opentelemetry_redix:
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- instrumentation/opentelemetry_redix/**/*
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- instrumentation/opentelemetry_redix/**/*
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opentelemetry_telemetry:
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opentelemetry_telemetry:
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- utilities/opentelemetry_telemetry/**/*
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- utilities/opentelemetry_telemetry/**/*
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opentelemetry_oban:
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- instrumentation/opentelemetry_oban/**/*
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@ -228,3 +228,40 @@ jobs:
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run: mix format --check-formatted
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run: mix format --check-formatted
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- name: Test
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- name: Test
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run: mix test
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run: mix test
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opentelemetry-process-propagator:
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needs: [test-matrix]
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if: (contains(github.event.pull_request.labels.*.name, 'elixir') && contains(github.event.pull_request.labels.*.name, 'opentelemetry_process_propagator'))
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env:
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app: 'opentelemetry_process_propagator'
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defaults:
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run:
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working-directory: propagators/${{ env.app }}
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runs-on: ubuntu-18.04
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name: Opentelemetry Process Propagator test on Elixir ${{ matrix.elixir_version }} (OTP ${{ matrix.otp_version }})
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strategy:
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fail-fast: false
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matrix: ${{ fromJson(needs.test-matrix.outputs.matrix) }}
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steps:
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- uses: actions/checkout@v2
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- uses: erlef/setup-beam@v1
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with:
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otp-version: ${{ matrix.otp_version }}
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elixir-version: ${{ matrix.elixir_version }}
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rebar3-version: ${{ matrix.rebar3_version }}
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- name: Cache
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uses: actions/cache@v2
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with:
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path: |
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~/deps
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~/_build
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key: ${{ runner.os }}-build-${{ matrix.otp_version }}-${{ matrix.elixir_version }}-v3-${{ hashFiles('**/mix.lock') }}
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- name: Fetch deps
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if: steps.deps-cache.outputs.cache-hit != 'true'
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run: mix deps.get
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- name: Compile project
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run: mix compile --warnings-as-errors
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- name: Check formatting
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run: mix format --check-formatted
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- name: Test
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run: mix test
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@ -0,0 +1,5 @@
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# Used by "mix format"
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[
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line_length: 120,
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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@ -0,0 +1,19 @@
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.rebar3
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_*
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.eunit
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*.o
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*.beam
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*.plt
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*.swp
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*.swo
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.erlang.cookie
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ebin
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log
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erl_crash.dump
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.rebar
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logs
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_build
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.idea
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*.iml
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rebar3.crashdump
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*~
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@ -0,0 +1,191 @@
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Apache License
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||||||
|
Version 2.0, January 2004
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|
http://www.apache.org/licenses/
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|
|
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|
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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END OF TERMS AND CONDITIONS
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|
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Copyright 2021, Bryan Naegele <bryan@fourthtime.com>.
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|
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|
Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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@ -0,0 +1,6 @@
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# Opentelemetry Process Propagator
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[](https://github.com/erlef/eef-observability-wg)
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[](https://hex.pm/packages/opentelemetry_process_propagator)
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|
||||||
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Functions for cross-process opentelemetry context propagation.
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@ -0,0 +1,115 @@
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defmodule OpentelemetryProcessPropagator do
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@moduledoc """
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`OpentelemetryProcessPropagator` provides helpers for dealing
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with context propagation across process boundaries.
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|
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## Context Propagation
|
||||||
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|
||||||
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Erlang and Elixir do not have a mechanism for transparently passing
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context between processes. This requires the user to explicitly
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||||||
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pass data between processes. In order to continue a trace across
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||||||
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processes, the user must start a new span and pass it to the
|
||||||
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spawned process.
|
||||||
|
|
||||||
|
```
|
||||||
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span_ctx = OpenTelemetry.Tracer.start_span("child")
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ctx = OpenTelemetry.Ctx.get_current()
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task =
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||||||
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Task.async(fn ->
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||||||
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OpenTelemetry.Ctx.attach(ctx)
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||||||
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OpenTelemetry.Tracer.set_current_span(span_ctx)
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||||||
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# do work here
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||||||
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|
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OpenTelemetry.Tracer.end_span(span_ctx)
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end)
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||||||
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||||||
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_result = Task.await(task)
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```
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||||||
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|
||||||
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### Reverse Propagation
|
||||||
|
|
||||||
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It's not always possible to have full control over traces, such as
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||||||
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when using `telemetry` events emitted from a library you don't control
|
||||||
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to create a span. In such cases, a mechanism to fetch a context from a
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||||||
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calling process is necessary. This is effectively context propagation
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||||||
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in reverse.
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||||||
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|
||||||
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As an example, Ecto uses the `Task` module to execute preloads which are
|
||||||
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each a separate query. Since a task is a spawned process, creating an otel
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||||||
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span results in orphan spans. To correctly connect these spans we must
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||||||
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find the otel context which spawned the process.
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||||||
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|
||||||
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## Usage
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||||||
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|
||||||
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Example of using `fetch_parent_ctx/1` to find a parent context.
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||||||
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|
||||||
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```elixir
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OpenTelemetry.with_span :span_started_in_your_app do
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||||||
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# some span being created in a process spawned by a library
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||||||
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# you don't control, e.g. Ecto preloads
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||||||
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Task.async(fn ->
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parent_ctx = OpentelemetryProcessPropagator.fetch_parent_ctx(:"$callers")
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||||||
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||||||
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OpenTelemetry.Ctx.attach(parent_ctx)
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||||||
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|
||||||
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attrs = %{some_attr: :from_telemetry_event}
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||||||
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|
||||||
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span =
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||||||
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OpenTelemetry.Tracer.start_span(:span_created_in_lib, %{attributes: attrs})
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||||||
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|
||||||
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OpenTelemetry.Span.end_span(span)
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||||||
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end)
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||||||
|
end
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||||||
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```
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||||||
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|
||||||
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```erlang
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||||||
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?with_span(span_started_in_your_app, #{}, fun() ->
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||||||
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%% some span being created in a process spawned by a library
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||||||
|
%% you don't control
|
||||||
|
|
||||||
|
proc_lib:spawn_link(fun() ->
|
||||||
|
Tracer = opentelemetry:get_tracer(test_tracer),
|
||||||
|
ParentCtx = opentelemetry_process_propagator:fetch_parent_ctx(),
|
||||||
|
otel_ctx:attach(ParentCtx),
|
||||||
|
Span = otel_tracer:start_span(Tracer, span_created_in_lib, #{}),
|
||||||
|
otel_tracer:end_span(Span).
|
||||||
|
).
|
||||||
|
end
|
||||||
|
```
|
||||||
|
|
||||||
|
"""
|
||||||
|
|
||||||
|
@doc """
|
||||||
|
Attempt to fetch an otel context from a give pid.
|
||||||
|
"""
|
||||||
|
@spec fetch_ctx(pid) :: OpenTelemetry.span_ctx() | :undefined
|
||||||
|
defdelegate fetch_ctx(pid), to: :opentelemetry_process_propagator
|
||||||
|
|
||||||
|
@doc """
|
||||||
|
Attempt to find an otel context in the spawning process.
|
||||||
|
|
||||||
|
This is equivalent to calling `fetch_parent_ctx(1, :"$ancestors")`
|
||||||
|
"""
|
||||||
|
@spec fetch_parent_ctx() :: OpenTelemetry.span_ctx() | :undefined
|
||||||
|
defdelegate fetch_parent_ctx(), to: :opentelemetry_process_propagator
|
||||||
|
|
||||||
|
@doc """
|
||||||
|
Attempt to find an otel context in a spawning process within `n` number of parent
|
||||||
|
processes
|
||||||
|
"""
|
||||||
|
@spec fetch_parent_ctx(non_neg_integer()) :: OpenTelemetry.span_ctx() | :undefined
|
||||||
|
defdelegate fetch_parent_ctx(depth), to: :opentelemetry_process_propagator
|
||||||
|
|
||||||
|
@doc """
|
||||||
|
Attempt to find an otel context under a given process dictionary key
|
||||||
|
within `n` number of parent processes. The first context found will be
|
||||||
|
returned.
|
||||||
|
|
||||||
|
Processes spawned by `proc_lib` are stored under `:"$ancestors`. The
|
||||||
|
Elixir `Task` module uses the `:"$callers` key.
|
||||||
|
"""
|
||||||
|
@spec fetch_parent_ctx(non_neg_integer(), atom()) :: OpenTelemetry.span_ctx() | :undefined
|
||||||
|
defdelegate fetch_parent_ctx(max_depth, key), to: :opentelemetry_process_propagator
|
||||||
|
end
|
||||||
|
|
@ -0,0 +1,100 @@
|
||||||
|
defmodule OpentelemetryProcessPropagator.MixProject do
|
||||||
|
use Mix.Project
|
||||||
|
|
||||||
|
def project do
|
||||||
|
{app, desc} = load_app()
|
||||||
|
config = load_config()
|
||||||
|
|
||||||
|
[
|
||||||
|
app: app,
|
||||||
|
version: version(Keyword.fetch!(desc, :vsn)),
|
||||||
|
description: to_string(Keyword.fetch!(desc, :description)),
|
||||||
|
elixir: "~> 1.10",
|
||||||
|
start_permanent: Mix.env() == :prod,
|
||||||
|
deps: deps(Keyword.fetch!(config, :deps)),
|
||||||
|
name: "Opentelemetry Process Propagator",
|
||||||
|
source_url:
|
||||||
|
"https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/propagators/opentelemetry_process_propagator",
|
||||||
|
docs: [
|
||||||
|
markdown_processor: ExDoc.Markdown.Earmark,
|
||||||
|
main: "OpentelemetryTelemetry",
|
||||||
|
# logo: "path/to/logo.png",
|
||||||
|
# erlang_docs()
|
||||||
|
extras: []
|
||||||
|
],
|
||||||
|
aliases: [
|
||||||
|
# when build docs first build edocs with rebar3
|
||||||
|
docs: ["cmd rebar3 edoc", "docs"]
|
||||||
|
],
|
||||||
|
package: package()
|
||||||
|
]
|
||||||
|
end
|
||||||
|
|
||||||
|
defp version(version) when is_list(version) do
|
||||||
|
List.to_string(version)
|
||||||
|
end
|
||||||
|
|
||||||
|
defp version({:file, path}) do
|
||||||
|
path
|
||||||
|
|> File.read!()
|
||||||
|
|> String.trim()
|
||||||
|
end
|
||||||
|
|
||||||
|
# Run "mix help compile.app" to learn about applications.
|
||||||
|
def application do
|
||||||
|
[
|
||||||
|
extra_applications: [:logger]
|
||||||
|
]
|
||||||
|
end
|
||||||
|
|
||||||
|
defp deps(rebar) do
|
||||||
|
rebar
|
||||||
|
|> Enum.map(fn
|
||||||
|
{dep, version} -> {dep, to_string(version)}
|
||||||
|
dep when is_atom(dep) -> {dep, ">= 0.0.0"}
|
||||||
|
end)
|
||||||
|
|> Enum.concat([
|
||||||
|
{:dialyxir, "~> 1.1", only: [:dev, :test], runtime: false},
|
||||||
|
{:ex_doc, "~> 0.26.0", only: :dev, runtime: false},
|
||||||
|
{:opentelemetry, "~> 1.0", only: [:dev, :test]},
|
||||||
|
{:opentelemetry_exporter, "~> 1.0", only: [:dev, :test]}
|
||||||
|
])
|
||||||
|
end
|
||||||
|
|
||||||
|
defp package() do
|
||||||
|
[
|
||||||
|
description: "Tools for opentelemetry context propagation across process boundaries",
|
||||||
|
build_tools: ["rebar3", "mix"],
|
||||||
|
files: ~w(lib mix.exs README.md LICENSE rebar.config rebar.lock VERSION src),
|
||||||
|
licenses: ["Apache-2.0"],
|
||||||
|
links: %{
|
||||||
|
"GitHub" =>
|
||||||
|
"https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/propagators/opentelemetry_process_propagator",
|
||||||
|
"OpenTelemetry Erlang" => "https://github.com/open-telemetry/opentelemetry-erlang",
|
||||||
|
"OpenTelemetry Erlang Contrib" => "https://github.com/open-telemetry/opentelemetry-erlang-contrib",
|
||||||
|
"OpenTelemetry.io" => "https://opentelemetry.io"
|
||||||
|
}
|
||||||
|
]
|
||||||
|
end
|
||||||
|
|
||||||
|
def erlang_docs() do
|
||||||
|
files =
|
||||||
|
for file <- Path.wildcard("edoc/*.md"),
|
||||||
|
file != "edoc/README.md",
|
||||||
|
do: {String.to_atom(file), [title: Path.basename(file, ".md")]}
|
||||||
|
|
||||||
|
[{:"README.md", [title: "Overview"]} | files]
|
||||||
|
end
|
||||||
|
|
||||||
|
defp load_config do
|
||||||
|
{:ok, config} = :file.consult('rebar.config')
|
||||||
|
|
||||||
|
config
|
||||||
|
end
|
||||||
|
|
||||||
|
defp load_app do
|
||||||
|
{:ok, [{:application, name, desc}]} = :file.consult('src/opentelemetry_process_propagator.app.src')
|
||||||
|
|
||||||
|
{name, desc}
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
@ -0,0 +1,21 @@
|
||||||
|
%{
|
||||||
|
"acceptor_pool": {:hex, :acceptor_pool, "1.0.0", "43c20d2acae35f0c2bcd64f9d2bde267e459f0f3fd23dab26485bf518c281b21", [:rebar3], [], "hexpm", "0cbcd83fdc8b9ad2eee2067ef8b91a14858a5883cb7cd800e6fcd5803e158788"},
|
||||||
|
"chatterbox": {:hex, :ts_chatterbox, "0.11.0", "b8f372c706023eb0de5bf2976764edb27c70fe67052c88c1f6a66b3a5626847f", [:rebar3], [{:hpack, "~>0.2.3", [hex: :hpack_erl, repo: "hexpm", optional: false]}], "hexpm", "722fe2bad52913ab7e87d849fc6370375f0c961ffb2f0b5e6d647c9170c382a6"},
|
||||||
|
"ctx": {:hex, :ctx, "0.6.0", "8ff88b70e6400c4df90142e7f130625b82086077a45364a78d208ed3ed53c7fe", [:rebar3], [], "hexpm", "a14ed2d1b67723dbebbe423b28d7615eb0bdcba6ff28f2d1f1b0a7e1d4aa5fc2"},
|
||||||
|
"dialyxir": {:hex, :dialyxir, "1.1.0", "c5aab0d6e71e5522e77beff7ba9e08f8e02bad90dfbeffae60eaf0cb47e29488", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "07ea8e49c45f15264ebe6d5b93799d4dd56a44036cf42d0ad9c960bc266c0b9a"},
|
||||||
|
"earmark_parser": {:hex, :earmark_parser, "1.4.19", "de0d033d5ff9fc396a24eadc2fcf2afa3d120841eb3f1004d138cbf9273210e8", [:mix], [], "hexpm", "527ab6630b5c75c3a3960b75844c314ec305c76d9899bb30f71cb85952a9dc45"},
|
||||||
|
"erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
|
||||||
|
"ex_doc": {:hex, :ex_doc, "0.26.0", "1922164bac0b18b02f84d6f69cab1b93bc3e870e2ad18d5dacb50a9e06b542a3", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "2775d66e494a9a48355db7867478ffd997864c61c65a47d31c4949459281c78d"},
|
||||||
|
"gproc": {:hex, :gproc, "0.8.0", "cea02c578589c61e5341fce149ea36ccef236cc2ecac8691fba408e7ea77ec2f", [:rebar3], [], "hexpm", "580adafa56463b75263ef5a5df4c86af321f68694e7786cb057fd805d1e2a7de"},
|
||||||
|
"grpcbox": {:hex, :grpcbox, "0.14.0", "3eb321bcd2275baf8b54cf381feb7b0559a50c02544de28fda039c7f2f9d1a7a", [:rebar3], [{:acceptor_pool, "~>1.0.0", [hex: :acceptor_pool, repo: "hexpm", optional: false]}, {:chatterbox, "~>0.11.0", [hex: :ts_chatterbox, repo: "hexpm", optional: false]}, {:ctx, "~>0.6.0", [hex: :ctx, repo: "hexpm", optional: false]}, {:gproc, "~>0.8.0", [hex: :gproc, repo: "hexpm", optional: false]}], "hexpm", "e24159b7b6d3f9869bbe528845c0125fed2259366ba908fd04a1f45fe81d0660"},
|
||||||
|
"hpack": {:hex, :hpack_erl, "0.2.3", "17670f83ff984ae6cd74b1c456edde906d27ff013740ee4d9efaa4f1bf999633", [:rebar3], [], "hexpm", "06f580167c4b8b8a6429040df36cc93bba6d571faeaec1b28816523379cbb23a"},
|
||||||
|
"makeup": {:hex, :makeup, "1.0.5", "d5a830bc42c9800ce07dd97fa94669dfb93d3bf5fcf6ea7a0c67b2e0e4a7f26c", [:mix], [{:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cfa158c02d3f5c0c665d0af11512fed3fba0144cf1aadee0f2ce17747fba2ca9"},
|
||||||
|
"makeup_elixir": {:hex, :makeup_elixir, "0.15.2", "dc72dfe17eb240552857465cc00cce390960d9a0c055c4ccd38b70629227e97c", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.1", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "fd23ae48d09b32eff49d4ced2b43c9f086d402ee4fd4fcb2d7fad97fa8823e75"},
|
||||||
|
"makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
|
||||||
|
"nimble_parsec": {:hex, :nimble_parsec, "1.2.0", "b44d75e2a6542dcb6acf5d71c32c74ca88960421b6874777f79153bbbbd7dccc", [:mix], [], "hexpm", "52b2871a7515a5ac49b00f214e4165a40724cf99798d8e4a65e4fd64ebd002c1"},
|
||||||
|
"opentelemetry": {:hex, :opentelemetry, "1.0.0", "6e98f4a9230681b2e4c88d45783ce1c02d671ffc0b5ac0cba69a34a3f5ada8d8", [:rebar3], [{:opentelemetry_api, "~> 1.0.0", [hex: :opentelemetry_api, repo: "hexpm", optional: false]}], "hexpm", "08d8697740f70594d05067cb62a0a8845ff568b2d47e1f8c78c46708ab58a74f"},
|
||||||
|
"opentelemetry_api": {:hex, :opentelemetry_api, "1.0.0", "6e501f750ead189f35aed07eb8023fa6655fca12f913a196102f67db4ed5172c", [:mix, :rebar3], [], "hexpm", "ac51520bde21fdea7f82cea9236ce4e88a21281c22bc23b0f1fa3b28b4352fcf"},
|
||||||
|
"opentelemetry_exporter": {:hex, :opentelemetry_exporter, "1.0.0", "12fd928e72dec8108d40214a667e7a90026827d6268db678617c9e40ec3dc931", [:rebar3], [{:grpcbox, ">= 0.0.0", [hex: :grpcbox, repo: "hexpm", optional: false]}, {:opentelemetry, "~> 1.0", [hex: :opentelemetry, repo: "hexpm", optional: false]}, {:opentelemetry_api, "~> 1.0", [hex: :opentelemetry_api, repo: "hexpm", optional: false]}, {:tls_certificate_check, "~> 1.11", [hex: :tls_certificate_check, repo: "hexpm", optional: false]}], "hexpm", "e2d2377abfb823cc99c1b68b4ce31df1ff1ce63e0c7bdbee7a7527e2d825168d"},
|
||||||
|
"ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.6", "cf344f5692c82d2cd7554f5ec8fd961548d4fd09e7d22f5b62482e5aeaebd4b0", [:make, :mix, :rebar3], [], "hexpm", "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680"},
|
||||||
|
"tls_certificate_check": {:hex, :tls_certificate_check, "1.11.0", "609dcd503f31170f0799dac380eb0e086388cf918fc769aaa60ddd6bbf575218", [:rebar3], [{:ssl_verify_fun, "1.1.6", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "4ab962212ef7c87482619cb298e1fe06e047b57f0bd58cc417b3b299eb8d036e"},
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,29 @@
|
||||||
|
{erl_opts, [debug_info]}.
|
||||||
|
{deps, [
|
||||||
|
{opentelemetry_api, "~> 1.0"}
|
||||||
|
]}.
|
||||||
|
|
||||||
|
{project_plugins, [covertool,
|
||||||
|
erlfmt]}.
|
||||||
|
{profiles,
|
||||||
|
[{docs, [{deps, [edown]},
|
||||||
|
{edoc_opts,
|
||||||
|
[{doclet, edown_doclet},
|
||||||
|
{preprocess, true},
|
||||||
|
{dir, "edoc"},
|
||||||
|
{subpackages, true}]}]},
|
||||||
|
{test, [{erl_opts, [nowarn_export_all]},
|
||||||
|
{deps, [
|
||||||
|
{opentelemetry, "~> 1.0"},
|
||||||
|
{opentelemetry_exporter, "~> 1.0"}
|
||||||
|
]},
|
||||||
|
{paths, ["src", "test/support"]},
|
||||||
|
{ct_opts, [{ct_hooks, [cth_surefire]}]}]}]}.
|
||||||
|
|
||||||
|
{xref_checks, [undefined_function_calls, undefined_functions,
|
||||||
|
deprecated_function_calls, deprecated_functions]}.
|
||||||
|
{xref_ignores, []}.
|
||||||
|
|
||||||
|
{cover_enabled, true}.
|
||||||
|
{cover_export_enabled, true}.
|
||||||
|
{covertool, [{coverdata_files, ["ct.coverdata"]}]}.
|
||||||
|
|
@ -0,0 +1,8 @@
|
||||||
|
{"1.2.0",
|
||||||
|
[{<<"opentelemetry_api">>,{pkg,<<"opentelemetry_api">>,<<"1.0.0-rc.4">>},0}]}.
|
||||||
|
[
|
||||||
|
{pkg_hash,[
|
||||||
|
{<<"opentelemetry_api">>, <<"13FB20B8800149CE52DAA8FB793C1A45B826CC4BD0D5BC7E8A00CAB46285CBE6">>}]},
|
||||||
|
{pkg_hash_ext,[
|
||||||
|
{<<"opentelemetry_api">>, <<"29C5BF7D5C40C4B9816906277BEB2438E6737073721C75398465B1ACD1B56B06">>}]}
|
||||||
|
].
|
||||||
|
|
@ -0,0 +1,15 @@
|
||||||
|
{application, opentelemetry_process_propagator,
|
||||||
|
[{description, "Tools for OpenTelemetry context propagation across process boundaries"},
|
||||||
|
{vsn, "0.1.0"},
|
||||||
|
{registered, []},
|
||||||
|
{applications,
|
||||||
|
[kernel,
|
||||||
|
stdlib,
|
||||||
|
opentelemetry_api
|
||||||
|
]},
|
||||||
|
{env,[]},
|
||||||
|
{modules, []},
|
||||||
|
|
||||||
|
{licenses, ["Apache 2.0"]},
|
||||||
|
{links, []}
|
||||||
|
]}.
|
||||||
|
|
@ -0,0 +1,66 @@
|
||||||
|
-module(opentelemetry_process_propagator).
|
||||||
|
|
||||||
|
-export([fetch_ctx/1,
|
||||||
|
fetch_parent_ctx/0,
|
||||||
|
fetch_parent_ctx/1,
|
||||||
|
fetch_parent_ctx/2]).
|
||||||
|
|
||||||
|
-spec fetch_parent_ctx() -> opentelemetry:span_ctx() | undefined.
|
||||||
|
fetch_parent_ctx() ->
|
||||||
|
fetch_parent_ctx(1, '$ancestors').
|
||||||
|
|
||||||
|
-spec fetch_parent_ctx(non_neg_integer()) -> opentelemetry:span_ctx() | undefined.
|
||||||
|
fetch_parent_ctx(MaxDepth) ->
|
||||||
|
fetch_parent_ctx(MaxDepth, '$ancestors').
|
||||||
|
|
||||||
|
-spec fetch_parent_ctx(non_neg_integer(), atom()) -> opentelemetry:span_ctx() | undefined.
|
||||||
|
fetch_parent_ctx(MaxDepth, Key) ->
|
||||||
|
Pids = pids(Key, pdict(self())),
|
||||||
|
inspect_parent(undefined, lists:sublist(Pids, MaxDepth)).
|
||||||
|
|
||||||
|
inspect_parent(Ctx, _Pids) when Ctx =/= undefined ->
|
||||||
|
Ctx;
|
||||||
|
inspect_parent(Ctx, []) ->
|
||||||
|
Ctx;
|
||||||
|
inspect_parent(_Ctx, [Pid | Rest]) ->
|
||||||
|
case fetch_ctx(Pid) of
|
||||||
|
undefined ->
|
||||||
|
inspect_parent(undefined, Rest);
|
||||||
|
OtelCtx ->
|
||||||
|
inspect_parent(OtelCtx, [])
|
||||||
|
end.
|
||||||
|
|
||||||
|
-spec fetch_ctx(pid()) -> opentelemetry:span_ctx() | undefined.
|
||||||
|
fetch_ctx(Pid) ->
|
||||||
|
case pdict(Pid) of
|
||||||
|
undefined ->
|
||||||
|
undefined;
|
||||||
|
Dictionary ->
|
||||||
|
otel_ctx(Dictionary)
|
||||||
|
end.
|
||||||
|
|
||||||
|
-spec pdict(pid()) -> [{term(), term()}] | undefined.
|
||||||
|
pdict(Pid) ->
|
||||||
|
case process_info(Pid, dictionary) of
|
||||||
|
{dictionary, Dict} ->
|
||||||
|
Dict;
|
||||||
|
undefined ->
|
||||||
|
undefined
|
||||||
|
end.
|
||||||
|
|
||||||
|
-spec otel_ctx([{term(), term()}]) -> opentelemetry:span_ctx() | undefined.
|
||||||
|
otel_ctx(Dictionary) ->
|
||||||
|
case lists:keyfind('$__current_otel_ctx', 1, Dictionary) of
|
||||||
|
false ->
|
||||||
|
undefined;
|
||||||
|
{'$__current_otel_ctx', Ctx} ->
|
||||||
|
Ctx
|
||||||
|
end.
|
||||||
|
|
||||||
|
pids(Key, Dictionary) ->
|
||||||
|
case lists:keyfind(Key, 1, Dictionary) of
|
||||||
|
false ->
|
||||||
|
[];
|
||||||
|
{Key,Pids} ->
|
||||||
|
Pids
|
||||||
|
end.
|
||||||
|
|
@ -0,0 +1,161 @@
|
||||||
|
defmodule OpentelemetryProcessPropagatorTest do
|
||||||
|
use ExUnit.Case
|
||||||
|
import OpentelemetryProcessPropagator
|
||||||
|
|
||||||
|
require OpenTelemetry.Tracer, as: Tracer
|
||||||
|
alias OpenTelemetry.Ctx
|
||||||
|
|
||||||
|
setup_all do
|
||||||
|
Application.put_env(:opentelemetry, :processors,
|
||||||
|
otel_batch_processor: %{scheduled_delay_ms: 1, exporter: [otel_exporter_pid: self()]}
|
||||||
|
)
|
||||||
|
end
|
||||||
|
|
||||||
|
describe "fetch_ctx/1" do
|
||||||
|
test "returns undefined if no context found" do
|
||||||
|
assert :undefined == fetch_ctx(self())
|
||||||
|
end
|
||||||
|
|
||||||
|
test "returns the ctx if there is one" do
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
|
||||||
|
assert ctx == fetch_ctx(self())
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
describe "fetch_parent_ctx/0" do
|
||||||
|
test "will not find parent ctx when spawned by kernel" do
|
||||||
|
ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(ctx)
|
||||||
|
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
spawn(fn ->
|
||||||
|
send(pid, fetch_parent_ctx())
|
||||||
|
end)
|
||||||
|
|
||||||
|
assert_receive :undefined
|
||||||
|
end
|
||||||
|
|
||||||
|
test "fetches the parent ctx when spawned by proclib" do
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
p_ctx = fetch_parent_ctx()
|
||||||
|
send(pid, p_ctx)
|
||||||
|
end)
|
||||||
|
|
||||||
|
assert_receive ^ctx
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
describe "fetch_parent_ctx/1" do
|
||||||
|
test "will not find parent ctx when parent beyond max depth" do
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
send(pid, fetch_parent_ctx())
|
||||||
|
end)
|
||||||
|
end)
|
||||||
|
|
||||||
|
assert_receive :undefined
|
||||||
|
end
|
||||||
|
|
||||||
|
test "fetches the parent ctx when within max depth" do
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
send(pid, fetch_parent_ctx(2))
|
||||||
|
end)
|
||||||
|
end)
|
||||||
|
|
||||||
|
assert_receive ^ctx
|
||||||
|
end
|
||||||
|
|
||||||
|
test "fetches the first ctx found" do
|
||||||
|
span_ctx1 = Tracer.start_span("parent")
|
||||||
|
Tracer.set_current_span(span_ctx1)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
span_ctx2 = Tracer.start_span("child")
|
||||||
|
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
Ctx.attach(ctx)
|
||||||
|
Tracer.set_current_span(span_ctx2)
|
||||||
|
|
||||||
|
Ctx.get_current()
|
||||||
|
|
||||||
|
:proc_lib.spawn(fn ->
|
||||||
|
send(pid, fetch_parent_ctx(2))
|
||||||
|
end)
|
||||||
|
|
||||||
|
# keep proc alive
|
||||||
|
Process.sleep(10)
|
||||||
|
end)
|
||||||
|
|
||||||
|
refute_receive ^ctx
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
describe "fetch_parent_ctx/2" do
|
||||||
|
test "works with other keys" do
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
|
||||||
|
pid = self()
|
||||||
|
|
||||||
|
Task.async(fn ->
|
||||||
|
send(pid, fetch_parent_ctx(1, :"$callers"))
|
||||||
|
end)
|
||||||
|
|
||||||
|
assert_receive ^ctx
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
defmodule GenServerTest do
|
||||||
|
use GenServer
|
||||||
|
|
||||||
|
def init(_), do: {:ok, %{}}
|
||||||
|
|
||||||
|
def handle_call(:call, {pid, _ref}, state) do
|
||||||
|
send(pid, fetch_parent_ctx())
|
||||||
|
|
||||||
|
{:reply, :ok, state}
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
test "works with otp behaviours" do
|
||||||
|
{:ok, pid} = GenServer.start_link(GenServerTest, [])
|
||||||
|
|
||||||
|
span_ctx = Tracer.start_span("test")
|
||||||
|
Tracer.set_current_span(span_ctx)
|
||||||
|
|
||||||
|
ctx = Ctx.get_current()
|
||||||
|
|
||||||
|
GenServer.call(pid, :call)
|
||||||
|
|
||||||
|
assert_receive ^ctx
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
@ -0,0 +1 @@
|
||||||
|
ExUnit.start()
|
||||||
Loading…
Reference in New Issue