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Fix broken decode_binary! #81

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bencoppock wants to merge 2 commits into from
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Fix broken decode_binary! #81

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f5fd66f
Fix broken `decode_binary!`
bencoppock Oct 25, 2025
39411b4
Merge branch 'CuatroElixir:main' into fix-broken-decode-binary
bencoppock Mar 9, 2026
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4 changes: 3 additions & 1 deletion lib/slipstream/serializer/phoenix_socket_v2_serializer.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -103,9 +103,11 @@ defmodule Slipstream.Serializer.PhoenixSocketV2Serializer do
defp decode_binary!(<<
@push::size(8),
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@the-mikedavis the-mikedavis Nov 3, 2025

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I think the current implementation for decode_binary!/1 is correct: this clause is decoding binary pushes and the clause below is for replies. I would need to check the Phoenix code again but I think only the reply binary has the ref_size and ref parts.

join_ref_size::size(8),
ref_size::size(8),
topic_size::size(8),
event_size::size(8),
join_ref::binary-size(join_ref_size),
ref::binary-size(ref_size),
topic::binary-size(topic_size),
event::binary-size(event_size),
data::binary
Expand All @@ -114,7 +116,7 @@ defmodule Slipstream.Serializer.PhoenixSocketV2Serializer do
topic: topic,
event: event,
payload: {:binary, data},
ref: nil,
ref: ref,
join_ref: join_ref
}
end
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32 changes: 32 additions & 0 deletions test/slipstream/serializer/phoenix_socket_v2_serializer_test.exs
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Expand Up @@ -38,4 +38,36 @@ defmodule Slipstream.Serializer.PhoenixSocketV2SerializerTest do
end)
end
end

describe "encode!/2 and decode!/2 round-trip" do
test "binary payload messages encode and decode correctly" do
original_message = %Message{
topic: "test:topic",
event: "test_event",
payload: {:binary, <<1, 2, 3, 4>>},
ref: "123",
join_ref: "456"
}

encoded = encode!(original_message, json_parser: Jason)
decoded = decode!(encoded, opcode: :binary, json_parser: Jason)

assert decoded == original_message
end

test "text/JSON payload messages encode and decode correctly" do
original_message = %Message{
topic: "test:topic",
event: "test_event",
payload: %{"foo" => "bar", "baz" => 123},
ref: "123",
join_ref: "456"
}

encoded = encode!(original_message, json_parser: Jason)
decoded = decode!(encoded, opcode: :text, json_parser: Jason)

assert decoded == original_message
end
end
end
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