OpentelemetryReq plugin (#160)

* OpentelemetryReq plugin

* Split span handling

* version bump

* Remove set

* Unused var

* Set parent ctx back on completion
This commit is contained in:
Bryan Naegele 2023-03-31 09:51:27 -06:00 committed by GitHub
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13 changed files with 611 additions and 1 deletions

3
.github/labeler.yml vendored
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@ -68,6 +68,9 @@ opentelemetry_process_propagator:
opentelemetry_redix:
- instrumentation/opentelemetry_redix/**/*
opentelemetry_req:
- instrumentation/opentelemetry_req/**/*
opentelemetry_finch:
- instrumentation/opentelemetry_finch/**/*

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@ -188,6 +188,43 @@ jobs:
- name: Test
run: mix test
opentelemetry-req:
needs: [test-matrix]
if: (contains(github.event.pull_request.labels.*.name, 'elixir') && contains(github.event.pull_request.labels.*.name, 'opentelemetry_req'))
env:
app: 'opentelemetry_req'
defaults:
run:
working-directory: instrumentation/${{ env.app }}
runs-on: ubuntu-20.04
name: Opentelemetry Req test on Elixir ${{ matrix.elixir_version }} (OTP ${{ matrix.otp_version }})
strategy:
fail-fast: false
matrix: ${{ fromJson(needs.test-matrix.outputs.matrix) }}
steps:
- uses: actions/checkout@v3
- uses: erlef/setup-beam@v1
with:
otp-version: ${{ matrix.otp_version }}
elixir-version: ${{ matrix.elixir_version }}
rebar3-version: ${{ matrix.rebar3_version }}
- name: Cache
uses: actions/cache@v3
with:
path: |
~/deps
~/_build
key: ${{ runner.os }}-build-${{ matrix.otp_version }}-${{ matrix.elixir_version }}-v3-${{ hashFiles('**/mix.lock') }}
- name: Fetch deps
if: steps.deps-cache.outputs.cache-hit != 'true'
run: mix deps.get
- name: Compile project
run: mix compile --warnings-as-errors
- name: Check formatting
run: mix format --check-formatted
- name: Test
run: mix test
opentelemetry-finch:
needs: [test-matrix]
if: (contains(github.event.pull_request.labels.*.name, 'elixir') && contains(github.event.pull_request.labels.*.name, 'opentelemetry_finch'))

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@ -36,6 +36,7 @@ OpenTelemetry can collect tracing data using instrumentation. Vendors/Users can
- [opentelemetry-cowboy](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_cowboy)
- [opentelemetry-phoenix](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_phoenix)
- [opentelemetry-ecto](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_ecto)
- [opentelemetry-req](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_req)
## Supported Runtimes

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@ -0,0 +1,4 @@
# Used by "mix format"
[
inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
]

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@ -0,0 +1,26 @@
# The directory Mix will write compiled artifacts to.
/_build/
# If you run "mix test --cover", coverage assets end up here.
/cover/
# The directory Mix downloads your dependencies sources to.
/deps/
# Where third-party dependencies like ExDoc output generated docs.
/doc/
# Ignore .fetch files in case you like to edit your project deps locally.
/.fetch
# If the VM crashes, it generates a dump, let's ignore it too.
erl_crash.dump
# Also ignore archive artifacts (built via "mix archive.build").
*.ez
# Ignore package tarball (built via "mix hex.build").
opentelemetry_req-*.tar
# Temporary files, for example, from tests.
/tmp/

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@ -0,0 +1,20 @@
# Changelog
## 0.1.2
### Fixes
* Fix ctx not being set back to parent upon completion
## 0.1.1
### Fixes
* Fix client span to be the ctx injected to headers
## 0.1.0
### Features
* Initial release

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@ -0,0 +1,201 @@
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@ -0,0 +1,19 @@
# OpentelemetryReq
[![EEF Observability WG project](https://img.shields.io/badge/EEF-Observability-black)](https://github.com/erlef/eef-observability-wg)
[![Hex.pm](https://img.shields.io/hexpm/v/opentelemetry_phoenix)](https://hex.pm/packages/opentelemetry_req)
[Req](https://hex.pm/packages/req) plugin for OpenTelemetry instrumentation and propagation.
See [Docs](https://hex.pm/packages/opentelemetry_req) for usage instructions.
## Installation
```elixir
def deps do
[
{:opentelemetry_req, "~> 0.1.0"}
]
end
```

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@ -0,0 +1,211 @@
defmodule OpentelemetryReq do
@moduledoc """
Wraps the request in an opentelemetry span. Span names must be paramaterized, so the
`req_path_params` module and step should be registered before this step. This step is
expected by default and an error will be raised if the path params option is
not set for the request.
Given the steps pipeline can be halted to skip further steps from running, it is important
to _append_ request and response steps _after_ this step to ensure execution. Spans are not
created until the request is completed or errored.
### Example
```
client =
Req.new()
|> OpentelemetryReq.attach()
|> Req.Request.merge_options(
base_url: "http://localhost:4000",
propagate_trace_ctx: true
)
client
|> Req.get(
url: "/api/users/:user_id",
path_params: [user_id: user_id]
)
```
## Request Options
* `:span_name` - `String.t()` if provided, overrides the span name. Defaults to `nil`.
* `:no_path_params` - `boolean()` when set to `true` no path params are expected for the request. Defaults to `false`
* `:propagate_trace_ctx` - `boolean()` when set to `true`, trace headers will be propagated. Defaults to `false`
"""
alias OpenTelemetry.Tracer
alias OpenTelemetry.SemanticConventions.Trace
require Trace
require Tracer
require Logger
def attach(%Req.Request{} = request, options \\ []) do
request
|> Req.Request.register_options([:span_name, :no_path_params, :propagate_trace_ctx])
|> Req.Request.merge_options(options)
|> Req.Request.append_request_steps(
require_path_params: &require_path_params_option/1,
start_span: &start_span/1,
put_trace_headers: &maybe_put_trace_headers/1
)
|> Req.Request.prepend_response_steps(otel_end_span: &end_span/1)
|> Req.Request.prepend_error_steps(otel_end_span: &end_errored_span/1)
end
defp start_span(request) do
span_name = span_name(request)
attrs = build_req_attrs(request)
parent_ctx = OpenTelemetry.Ctx.get_current()
Process.put(:otel_parent_ctx, parent_ctx)
Tracer.start_span(span_name, %{
attributes: attrs,
kind: :client
})
|> Tracer.set_current_span()
request
end
defp end_span({request, %Req.Response{} = response}) do
attrs =
Map.put(%{}, Trace.http_status_code(), response.status)
|> maybe_append_resp_content_length(response)
Tracer.set_attributes(attrs)
if response.status >= 400 do
OpenTelemetry.Tracer.set_status(OpenTelemetry.status(:error, ""))
end
OpenTelemetry.Tracer.end_span()
Process.delete(:otel_parent_ctx)
|> OpenTelemetry.Ctx.attach()
{request, response}
end
defp end_errored_span({request, exception}) do
OpenTelemetry.Tracer.set_status(OpenTelemetry.status(:error, format_exception(exception)))
OpenTelemetry.Tracer.end_span()
Process.delete(:otel_parent_ctx)
|> OpenTelemetry.Ctx.attach()
{request, exception}
end
defp format_exception(%{__exception__: true} = exception) do
Exception.message(exception)
end
defp format_exception(_), do: ""
defp span_name(request) do
Req.Request.get_private(request, :path_params_template)
end
defp build_req_attrs(request) do
uri = request.url
url = url(uri)
%{
Trace.http_method() => http_method(request.method),
Trace.http_url() => url,
Trace.http_target() => uri.path,
Trace.net_host_name() => uri.host,
Trace.http_scheme() => uri.scheme
}
|> maybe_append_req_content_length(request)
|> maybe_append_retry_count(request)
end
defp maybe_append_req_content_length(attrs, req) do
case Req.Request.get_header(req, "content-length") do
[] ->
attrs
[length] ->
Map.put(attrs, Trace.http_request_content_length(), length)
end
end
defp maybe_append_resp_content_length(attrs, req) do
case Req.Response.get_header(req, "content-length") do
[] ->
attrs
[length] ->
Map.put(attrs, Trace.http_response_content_length(), length)
end
end
defp maybe_append_retry_count(attrs, req) do
retry_count = Req.Request.get_private(req, :req_retry_count, 0)
if retry_count > 0 do
Map.put(attrs, Trace.http_retry_count(), retry_count)
else
attrs
end
end
defp url(uri) do
if uri.query do
uri.path <> "?" <> uri.query
else
uri.path
end
end
defp http_method(method) do
case method do
:get -> :GET
:head -> :HEAD
:post -> :POST
:patch -> :PATCH
:put -> :PUT
:delete -> :DELETE
:connect -> :CONNECT
:options -> :OPTIONS
:trace -> :TRACE
end
end
defp maybe_put_trace_headers(request) do
if request.options[:propagate_trace_ctx] do
Map.put(request, :headers, :otel_propagator_text_map.inject(request.headers))
else
request
end
end
defp require_path_params_option(request) do
unless request.options[:no_path_params] do
unless Map.has_key?(request.options, :path_params) do
{Req.Request.halt(request), __MODULE__.PathParamsOptionError.new()}
else
request
end
else
request
end
end
defmodule PathParamsOptionError do
defexception [:message]
def new do
%__MODULE__{}
end
@impl true
def message(_) do
"req_path_params path parameter options must be provided"
end
end
end

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@ -0,0 +1,63 @@
defmodule OpentelemetryReq.MixProject do
use Mix.Project
def project do
[
app: :opentelemetry_req,
description: description(),
version: "0.1.2",
elixir: "~> 1.12",
start_permanent: Mix.env() == :prod,
deps: deps(),
name: "Opentelemetry Req",
docs: [
main: "OpentelemetryReq"
],
elixirc_paths: elixirc_paths(Mix.env()),
package: package(),
source_url:
"https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_req"
]
end
# Run "mix help compile.app" to learn about applications.
def application do
[
extra_applications: [:logger]
]
end
defp description do
"Trace Req requests with OpenTelemetry."
end
defp package do
[
description: "OpenTelemetry tracing for Req",
files: ~w(lib .formatter.exs mix.exs README* LICENSE* CHANGELOG*),
licenses: ["Apache-2.0"],
links: %{
"GitHub" =>
"https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_req",
"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
defp elixirc_paths(:test), do: ["lib", "test/support"]
defp elixirc_paths(_), do: ["lib"]
# Run "mix help deps" to learn about dependencies.
defp deps do
[
{:jason, "~> 1.3"},
{:opentelemetry_api, "~> 1.0"},
{:opentelemetry_semantic_conventions, "~> 0.2"},
{:req, ">= 0.3.5"},
{:ex_doc, "~> 0.29", only: [:dev, :test]}
]
end
end

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@ -0,0 +1,20 @@
%{
"castore": {:hex, :castore, "0.1.22", "4127549e411bedd012ca3a308dede574f43819fe9394254ca55ab4895abfa1a2", [:mix], [], "hexpm", "c17576df47eb5aa1ee40cc4134316a99f5cad3e215d5c77b8dd3cfef12a22cac"},
"earmark_parser": {:hex, :earmark_parser, "1.4.31", "a93921cdc6b9b869f519213d5bc79d9e218ba768d7270d46fdcf1c01bacff9e2", [:mix], [], "hexpm", "317d367ee0335ef037a87e46c91a2269fef6306413f731e8ec11fc45a7efd059"},
"ex_doc": {:hex, :ex_doc, "0.29.2", "dfa97532ba66910b2a3016a4bbd796f41a86fc71dd5227e96f4c8581fdf0fdf0", [:mix], [{:earmark_parser, "~> 1.4.19", [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", "6b5d7139eda18a753e3250e27e4a929f8d2c880dd0d460cb9986305dea3e03af"},
"finch": {:hex, :finch, "0.14.0", "619bfdee18fc135190bf590356c4bf5d5f71f916adb12aec94caa3fa9267a4bc", [:mix], [{:castore, "~> 0.1", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "5459acaf18c4fdb47a8c22fb3baff5d8173106217c8e56c5ba0b93e66501a8dd"},
"hpax": {:hex, :hpax, "0.1.2", "09a75600d9d8bbd064cdd741f21fc06fc1f4cf3d0fcc335e5aa19be1a7235c84", [:mix], [], "hexpm", "2c87843d5a23f5f16748ebe77969880e29809580efdaccd615cd3bed628a8c13"},
"jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
"makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
"makeup_elixir": {:hex, :makeup_elixir, "0.16.0", "f8c570a0d33f8039513fbccaf7108c5d750f47d8defd44088371191b76492b0b", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "28b2cbdc13960a46ae9a8858c4bebdec3c9a6d7b4b9e7f4ed1502f8159f338e7"},
"makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
"mime": {:hex, :mime, "2.0.3", "3676436d3d1f7b81b5a2d2bd8405f412c677558c81b1c92be58c00562bb59095", [:mix], [], "hexpm", "27a30bf0db44d25eecba73755acf4068cbfe26a4372f9eb3e4ea3a45956bff6b"},
"mint": {:hex, :mint, "1.5.1", "8db5239e56738552d85af398798c80648db0e90f343c8469f6c6d8898944fb6f", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "4a63e1e76a7c3956abd2c72f370a0d0aecddc3976dea5c27eccbecfa5e7d5b1e"},
"nimble_options": {:hex, :nimble_options, "0.5.2", "42703307b924880f8c08d97719da7472673391905f528259915782bb346e0a1b", [:mix], [], "hexpm", "4da7f904b915fd71db549bcdc25f8d56f378ef7ae07dc1d372cbe72ba950dce0"},
"nimble_parsec": {:hex, :nimble_parsec, "1.2.3", "244836e6e3f1200c7f30cb56733fd808744eca61fd182f731eac4af635cc6d0b", [:mix], [], "hexpm", "c8d789e39b9131acf7b99291e93dae60ab48ef14a7ee9d58c6964f59efb570b0"},
"nimble_pool": {:hex, :nimble_pool, "0.2.6", "91f2f4c357da4c4a0a548286c84a3a28004f68f05609b4534526871a22053cde", [:mix], [], "hexpm", "1c715055095d3f2705c4e236c18b618420a35490da94149ff8b580a2144f653f"},
"opentelemetry_api": {:hex, :opentelemetry_api, "1.2.1", "7b69ed4f40025c005de0b74fce8c0549625d59cb4df12d15c32fe6dc5076ff42", [:mix, :rebar3], [{:opentelemetry_semantic_conventions, "~> 0.2", [hex: :opentelemetry_semantic_conventions, repo: "hexpm", optional: false]}], "hexpm", "6d7a27b7cad2ad69a09cabf6670514cafcec717c8441beb5c96322bac3d05350"},
"opentelemetry_semantic_conventions": {:hex, :opentelemetry_semantic_conventions, "0.2.0", "b67fe459c2938fcab341cb0951c44860c62347c005ace1b50f8402576f241435", [:mix, :rebar3], [], "hexpm", "d61fa1f5639ee8668d74b527e6806e0503efc55a42db7b5f39939d84c07d6895"},
"req": {:hex, :req, "0.3.6", "541350d2cc359a8ad17059f2629c18be56d0c85ce0e4ddb27694b6ba482fe923", [:mix], [{:brotli, "~> 0.3.1", [hex: :brotli, repo: "hexpm", optional: true]}, {:ezstd, "~> 1.0", [hex: :ezstd, repo: "hexpm", optional: true]}, {:finch, "~> 0.9", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mime, "~> 1.6 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:nimble_csv, "~> 1.0", [hex: :nimble_csv, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "9181047f32b05f8737f6b5917af5ee5385219158bbe4e507f4ec57791a0a78c3"},
"telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
}

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defmodule OpentelemetryReqTest do
use ExUnit.Case
doctest OpentelemetryReq
end

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ExUnit.start()