garthk

#!/usr/bin/env python3

"""
Bundle the converter.

Inspiration: https://github.com/python-poetry/poetry/pull/2682
"""

from argparse import ArgumentParser
from contextlib import contextmanager

garthk

(fn gl ->
  :dbg.stop_clear()

  repr = fn
    %Phoenix.LiveView.Socket{} -> "socket"
    v -> inspect(v)
  end

  {:ok, _} =
    :dbg.tracer(

garthk

defmodule LVCallTime do
  @moduledoc """
  Best used sparingly.

      LVCallTime.start()
      :timer.sleep(:timer.seconds(20))
      LVCallTime.dump()
      LVCallTime.stop()

  or just

garthk

:dbg.stop_clear()

{:ok, _} =
  :dbg.tracer(
    :process,
    {fn
       {:trace, pid, :call, {mod, fun, args} = call}, stacks ->
         mfa = Exception.format_mfa(mod, fun, Enum.count(args)) |> Pretty.inspect(label: ":call")
         Smuggle.dump({mod, fun, args}, wrapper: :gfm)
         stack = Map.get(stacks, pid, [])

garthk

{:ok, _} =
  :dbg.tracer(
    :process,
    {fn
       {:trace, pid, :call, {mod, fun, args} = call}, stacks ->
         mfa = Exception.format_mfa(mod, fun, Enum.count(args))
         stack = Map.get(stacks, pid, [])

         if match?({Phoenix.PubSub, :broadcast, _}, call) do
           Pretty.inspect(stack, label: "broadcast stack")

garthk

defmodule Smuggle do
  @moduledoc """
  Make it easier to smuggle data from one system to another.

  If your target is an `iex` prompt:

      Smuggle.dump(value)
      # copy
      # paste into other iex

garthk

defmodule PidSnitchFormatter do
  @moduledoc """
  Report test PIDs?

  ```bash
  mix test --formatter PidSnitchFormatter
  ```

  See `ExUnit.CLIFormatter` for protocol details.
  """

garthk

# docker build -t start_span .
# docker run --rm -ti start_span

FROM elixir:1.10.3-alpine
RUN cd /usr/local/src && mix new start_span
WORKDIR /usr/local/src/start_span
COPY mix.exs README.md ./
COPY start_span.ex lib/
RUN mix local.hex --force && mix local.rebar --force && mix deps.get
CMD ["mix", "dialyzer"]

garthk

defmodule TelemetryTracingExperimentTest do
  use ExUnit.Case, async: true

  @doc """
  Dump a variable to standard output, ANSI formatted, and pretty.
  """
  def dump(v) do
    opts = IEx.Config.inspect_opts()

    [:reset, "\n", get_in(opts, [:syntax_colors, :reset]) || :reset, inspect(v, opts), :reset]

garthk

defmodule AutoRecords do

  defmacro __using__(_opts) do
    quote do
      require OpenTelemetry.Records.Auto
      import OpenTelemetry.Records.Auto, only: [auto_record: 2]
    end
  end

  defmacro auto_record(name, from_lib) do