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
GitHub
parent
a59f399155
commit
de17c31194
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@ -68,6 +68,9 @@ opentelemetry_process_propagator:
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opentelemetry_redix:
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- instrumentation/opentelemetry_redix/**/*
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opentelemetry_req:
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- instrumentation/opentelemetry_req/**/*
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opentelemetry_finch:
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- instrumentation/opentelemetry_finch/**/*
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@ -188,6 +188,43 @@ jobs:
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- name: Test
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run: mix test
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opentelemetry-req:
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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_req'))
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env:
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app: 'opentelemetry_req'
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defaults:
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run:
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working-directory: instrumentation/${{ env.app }}
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runs-on: ubuntu-20.04
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name: Opentelemetry Req 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@v3
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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@v3
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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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opentelemetry-finch:
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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_finch'))
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@ -36,6 +36,7 @@ OpenTelemetry can collect tracing data using instrumentation. Vendors/Users can
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- [opentelemetry-cowboy](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_cowboy)
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- [opentelemetry-phoenix](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_phoenix)
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- [opentelemetry-ecto](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_ecto)
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- [opentelemetry-req](https://github.com/open-telemetry/opentelemetry-erlang-contrib/tree/main/instrumentation/opentelemetry_req)
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## Supported Runtimes
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@ -0,0 +1,4 @@
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# Used by "mix format"
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[
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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@ -0,0 +1,26 @@
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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opentelemetry_req-*.tar
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# Temporary files, for example, from tests.
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/tmp/
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@ -0,0 +1,20 @@
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# Changelog
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## 0.1.2
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### Fixes
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* Fix ctx not being set back to parent upon completion
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## 0.1.1
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### Fixes
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* Fix client span to be the ctx injected to headers
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## 0.1.0
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### Features
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* Initial release
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@ -0,0 +1,201 @@
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Apache License
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@ -0,0 +1,19 @@
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# OpentelemetryReq
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[](https://github.com/erlef/eef-observability-wg)
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[](https://hex.pm/packages/opentelemetry_req)
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[Req](https://hex.pm/packages/req) plugin for OpenTelemetry instrumentation and propagation.
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See [Docs](https://hex.pm/packages/opentelemetry_req) for usage instructions.
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## Installation
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```elixir
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def deps do
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[
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{:opentelemetry_req, "~> 0.1.0"}
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]
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end
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```
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@ -0,0 +1,211 @@
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defmodule OpentelemetryReq do
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@moduledoc """
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Wraps the request in an opentelemetry span. Span names must be paramaterized, so the
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`req_path_params` module and step should be registered before this step. This step is
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expected by default and an error will be raised if the path params option is
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not set for the request.
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Given the steps pipeline can be halted to skip further steps from running, it is important
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to _append_ request and response steps _after_ this step to ensure execution. Spans are not
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created until the request is completed or errored.
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### Example
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```
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client =
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Req.new()
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|> OpentelemetryReq.attach()
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|> Req.Request.merge_options(
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base_url: "http://localhost:4000",
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propagate_trace_ctx: true
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)
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client
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|> Req.get(
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url: "/api/users/:user_id",
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path_params: [user_id: user_id]
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)
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```
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## Request Options
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* `:span_name` - `String.t()` if provided, overrides the span name. Defaults to `nil`.
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* `:no_path_params` - `boolean()` when set to `true` no path params are expected for the request. Defaults to `false`
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* `:propagate_trace_ctx` - `boolean()` when set to `true`, trace headers will be propagated. Defaults to `false`
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"""
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alias OpenTelemetry.Tracer
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alias OpenTelemetry.SemanticConventions.Trace
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require Trace
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require Tracer
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require Logger
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def attach(%Req.Request{} = request, options \\ []) do
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request
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|> Req.Request.register_options([:span_name, :no_path_params, :propagate_trace_ctx])
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|> Req.Request.merge_options(options)
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|> Req.Request.append_request_steps(
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require_path_params: &require_path_params_option/1,
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start_span: &start_span/1,
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put_trace_headers: &maybe_put_trace_headers/1
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)
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|> Req.Request.prepend_response_steps(otel_end_span: &end_span/1)
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|> Req.Request.prepend_error_steps(otel_end_span: &end_errored_span/1)
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end
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defp start_span(request) do
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span_name = span_name(request)
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attrs = build_req_attrs(request)
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parent_ctx = OpenTelemetry.Ctx.get_current()
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Process.put(:otel_parent_ctx, parent_ctx)
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Tracer.start_span(span_name, %{
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attributes: attrs,
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kind: :client
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})
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|> Tracer.set_current_span()
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request
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end
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defp end_span({request, %Req.Response{} = response}) do
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attrs =
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Map.put(%{}, Trace.http_status_code(), response.status)
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|> maybe_append_resp_content_length(response)
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Tracer.set_attributes(attrs)
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if response.status >= 400 do
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OpenTelemetry.Tracer.set_status(OpenTelemetry.status(:error, ""))
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end
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OpenTelemetry.Tracer.end_span()
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Process.delete(:otel_parent_ctx)
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|> OpenTelemetry.Ctx.attach()
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||||
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{request, response}
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end
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defp end_errored_span({request, exception}) do
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OpenTelemetry.Tracer.set_status(OpenTelemetry.status(:error, format_exception(exception)))
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||||
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||||
OpenTelemetry.Tracer.end_span()
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||||
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||||
Process.delete(:otel_parent_ctx)
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||||
|> OpenTelemetry.Ctx.attach()
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||||
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{request, exception}
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||||
end
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||||
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||||
defp format_exception(%{__exception__: true} = exception) do
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Exception.message(exception)
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end
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||||
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||||
defp format_exception(_), do: ""
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||||
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||||
defp span_name(request) do
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Req.Request.get_private(request, :path_params_template)
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||||
end
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||||
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||||
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
|
||||
|
|
@ -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
|
||||
|
|
@ -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"},
|
||||
}
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
defmodule OpentelemetryReqTest do
|
||||
use ExUnit.Case
|
||||
doctest OpentelemetryReq
|
||||
end
|
||||
|
|
@ -0,0 +1 @@
|
|||
ExUnit.start()
|
||||
Loading…
Reference in New Issue