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diff --git a/lib/exile/stream.ex b/lib/exile/stream.ex
index a4aa52f..8aa1dd7 100644
--- a/lib/exile/stream.ex
+++ b/lib/exile/stream.ex
@@ -1,267 +1,286 @@
defmodule Exile.Stream do
@moduledoc """
Defines a `Exile.Stream` struct returned by `Exile.stream!/2`.
"""
alias Exile.Process
alias Exile.Process.Error
require Logger
defmodule Sink do
@moduledoc false
@type t :: %__MODULE__{process: Process.t(), ignore_epipe: boolean}
defstruct [:process, :ignore_epipe]
defimpl Collectable do
def into(%{process: process}) do
collector_fun = fn
:ok, {:cont, x} ->
case Process.write(process, x) do
{:error, :epipe} ->
# there is no other way to stop a Collectable than to
# raise error, we catch this error and return `{:error, :epipe}`
raise Error, "epipe"
:ok ->
:ok
end
acc, :done ->
acc
acc, :halt ->
acc
end
{:ok, collector_fun}
end
end
end
- defstruct [:process, :stream_opts, :writer_task]
+ defstruct [:stream_opts, :process_opts, :cmd_with_args]
@typedoc "Struct members are private, do not depend on them"
- @type t :: %__MODULE__{process: Process.t(), stream_opts: map, writer_task: Task.t()}
+ @type t :: %__MODULE__{
+ stream_opts: map(),
+ process_opts: keyword(),
+ cmd_with_args: [String.t()]
+ }
@doc false
@spec __build__(nonempty_list(String.t()), keyword()) :: t()
def __build__(cmd_with_args, opts) do
{stream_opts, process_opts} =
Keyword.split(opts, [:exit_timeout, :max_chunk_size, :input, :enable_stderr, :ignore_epipe])
case normalize_stream_opts(stream_opts) do
{:ok, stream_opts} ->
- process_opts = Keyword.put(process_opts, :enable_stderr, stream_opts[:enable_stderr])
- {:ok, process} = Process.start_link(cmd_with_args, process_opts)
-
- writer_task =
- start_input_streamer(
- %Sink{process: process, ignore_epipe: stream_opts[:ignore_epipe]},
- stream_opts.input
- )
-
- %Exile.Stream{process: process, stream_opts: stream_opts, writer_task: writer_task}
+ %Exile.Stream{
+ stream_opts: stream_opts,
+ process_opts: process_opts,
+ cmd_with_args: cmd_with_args
+ }
{:error, error} ->
raise ArgumentError, message: error
end
end
- @doc false
- @spec start_input_streamer(term, term) :: Task.t()
- defp start_input_streamer(%Sink{process: process} = sink, input) do
- case input do
- :no_input ->
- # use `Task.completed(:ok)` when bumping min Elixir requirement
- Task.async(fn -> :ok end)
-
- {:enumerable, enum} ->
- Task.async(fn ->
- Process.change_pipe_owner(process, :stdin, self())
-
- try do
- Enum.into(enum, sink)
- rescue
- Error ->
- {:error, :epipe}
- end
- end)
-
- {:collectable, func} ->
- Task.async(fn ->
- Process.change_pipe_owner(process, :stdin, self())
-
- try do
- func.(sink)
- rescue
- Error ->
- {:error, :epipe}
- end
- end)
- end
- end
-
defimpl Enumerable do
# credo:disable-for-next-line Credo.Check.Refactor.CyclomaticComplexity
def reduce(arg, acc, fun) do
- %{
- process: process,
- stream_opts:
- %{
- enable_stderr: enable_stderr,
- ignore_epipe: ignore_epipe
- } = stream_opts,
- writer_task: writer_task
- } = arg
-
- start_fun = fn -> :premature_exit end
-
- next_fun = fn :premature_exit ->
+ start_fun = fn ->
+ state = start_process(arg)
+ {state, :premature_exit}
+ end
+
+ next_fun = fn {state, :premature_exit} ->
+ %{
+ process: process,
+ stream_opts: %{enable_stderr: enable_stderr} = stream_opts
+ } = state
+
case Process.read_any(process, stream_opts.max_chunk_size) do
:eof ->
- {:halt, :normal_exit}
+ {:halt, {state, :normal_exit}}
{:ok, {:stdout, x}} when enable_stderr == false ->
- {[IO.iodata_to_binary(x)], :premature_exit}
+ {[IO.iodata_to_binary(x)], {state, :premature_exit}}
- {:ok, {stream, x}} when enable_stderr == true ->
- {[{stream, IO.iodata_to_binary(x)}], :premature_exit}
+ {:ok, {io_stream, x}} when enable_stderr == true ->
+ {[{io_stream, IO.iodata_to_binary(x)}], {state, :premature_exit}}
{:error, errno} ->
raise Error, "failed to read from the external process. errno: #{inspect(errno)}"
end
end
- after_fun = fn exit_type ->
+ after_fun = fn {state, exit_type} ->
+ %{
+ process: process,
+ stream_opts:
+ %{
+ ignore_epipe: ignore_epipe
+ } = stream_opts,
+ writer_task: writer_task
+ } = state
+
result = Process.await_exit(process, stream_opts.exit_timeout)
writer_task_status = Task.await(writer_task)
case {exit_type, result, writer_task_status} do
# if reader exit early and there is a pending write
{:premature_exit, {:ok, _status}, {:error, :epipe}} when ignore_epipe ->
:ok
# if reader exit early and there is no pending write or if
# there is no writer
{:premature_exit, {:ok, _status}, :ok} when ignore_epipe ->
:ok
# if we get epipe from writer then raise that error, and ignore exit status
{:premature_exit, {:ok, _status}, {:error, :epipe}} when ignore_epipe == false ->
raise Error, "abnormal command exit, received EPIPE while writing to stdin"
# Normal exit success case
{_, {:ok, 0}, _} ->
:ok
{:normal_exit, {:ok, error}, _} ->
raise Error, "command exited with status: #{inspect(error)}"
end
end
Stream.resource(start_fun, next_fun, after_fun).(acc, fun)
end
def count(_stream) do
{:error, __MODULE__}
end
def member?(_stream, _term) do
{:error, __MODULE__}
end
def slice(_stream) do
{:error, __MODULE__}
end
+
+ defp start_process(%Exile.Stream{
+ process_opts: process_opts,
+ stream_opts: stream_opts,
+ cmd_with_args: cmd_with_args
+ }) do
+ process_opts = Keyword.put(process_opts, :enable_stderr, stream_opts[:enable_stderr])
+ {:ok, process} = Process.start_link(cmd_with_args, process_opts)
+ sink = %Sink{process: process, ignore_epipe: stream_opts[:ignore_epipe]}
+ writer_task = start_input_streamer(sink, stream_opts.input)
+
+ %{process: process, stream_opts: stream_opts, writer_task: writer_task}
+ end
+
+ @doc false
+ @spec start_input_streamer(term, term) :: Task.t()
+ defp start_input_streamer(%Sink{process: process} = sink, input) do
+ case input do
+ :no_input ->
+ # use `Task.completed(:ok)` when bumping min Elixir requirement
+ Task.async(fn -> :ok end)
+
+ {:enumerable, enum} ->
+ Task.async(fn ->
+ Process.change_pipe_owner(process, :stdin, self())
+
+ try do
+ Enum.into(enum, sink)
+ rescue
+ Error ->
+ {:error, :epipe}
+ end
+ end)
+
+ {:collectable, func} ->
+ Task.async(fn ->
+ Process.change_pipe_owner(process, :stdin, self())
+
+ try do
+ func.(sink)
+ rescue
+ Error ->
+ {:error, :epipe}
+ end
+ end)
+ end
+ end
end
@spec normalize_input(term) ::
{:ok, :no_input} | {:ok, {:enumerable, term}} | {:ok, {:collectable, function}}
defp normalize_input(term) do
cond do
is_nil(term) ->
{:ok, :no_input}
!is_function(term, 1) && Enumerable.impl_for(term) ->
{:ok, {:enumerable, term}}
is_function(term, 1) ->
{:ok, {:collectable, term}}
true ->
{:error, "`:input` must be either Enumerable or a function which accepts collectable"}
end
end
defp normalize_max_chunk_size(max_chunk_size) do
case max_chunk_size do
nil ->
{:ok, 65_536}
max_chunk_size when is_integer(max_chunk_size) and max_chunk_size > 0 ->
{:ok, max_chunk_size}
_ ->
{:error, ":max_chunk_size must be a positive integer"}
end
end
defp normalize_exit_timeout(timeout) do
case timeout do
nil ->
{:ok, 5000}
timeout when is_integer(timeout) and timeout > 0 ->
{:ok, timeout}
_ ->
{:error, ":exit_timeout must be either :infinity or an integer"}
end
end
defp normalize_enable_stderr(enable_stderr) do
case enable_stderr do
nil ->
{:ok, false}
enable_stderr when is_boolean(enable_stderr) ->
{:ok, enable_stderr}
_ ->
{:error, ":enable_stderr must be a boolean"}
end
end
defp normalize_ignore_epipe(ignore_epipe) do
case ignore_epipe do
nil ->
{:ok, false}
ignore_epipe when is_boolean(ignore_epipe) ->
{:ok, ignore_epipe}
_ ->
{:error, ":ignore_epipe must be a boolean"}
end
end
defp normalize_stream_opts(opts) do
with {:ok, input} <- normalize_input(opts[:input]),
{:ok, exit_timeout} <- normalize_exit_timeout(opts[:exit_timeout]),
{:ok, max_chunk_size} <- normalize_max_chunk_size(opts[:max_chunk_size]),
{:ok, enable_stderr} <- normalize_enable_stderr(opts[:enable_stderr]),
{:ok, ignore_epipe} <- normalize_ignore_epipe(opts[:ignore_epipe]) do
{:ok,
%{
input: input,
exit_timeout: exit_timeout,
max_chunk_size: max_chunk_size,
enable_stderr: enable_stderr,
ignore_epipe: ignore_epipe
}}
end
end
end

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