commit 7c948f8fbfddb4d9b281ff8cff68861717ab4b70 · comet.sh/drinkup

+1 -85

lib/drinkup.ex

···

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       defmodule Drinkup.Firehose do

     

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         alias Drinkup.Firehose

     

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         require Logger

     

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         use WebSockex

     

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         @default_host "https://bsky.network"

     

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         @op_regular 1

     

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         @op_error -1

     

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         # TODO: switch to Gun and GenServer?

     

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         def start_link(opts \\ []) do

     

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           opts = Keyword.validate!(opts, host: @default_host)

     

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           host = Keyword.get(opts, :host)

     

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           cursor = Keyword.get(opts, :cursor)

     

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           url =

     

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             "#{host}/xrpc/com.atproto.sync.subscribeRepos"

     

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             |> URI.new!()

     

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             |> URI.append_query(URI.encode_query(%{cursor: cursor}))

     

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             |> URI.to_string()

     

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           WebSockex.start_link(url, __MODULE__, 0)

     

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         end

     

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         def handle_connect(conn, state) do

     

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           Logger.info("Connected to Firehose at #{conn.host}#{conn.path}")

     

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           {:ok, state}

     

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         end

     

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         def handle_frame({:binary, msg}, state) do

     

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           with {:ok, header, next} <- CAR.DagCbor.decode(msg),

     

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                {:ok, payload, _} <- CAR.DagCbor.decode(next),

     

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                {%{"op" => @op_regular, "t" => type}, _} <- {header, payload},

     

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                true <- type == "#info" || valid_seq?(state, payload["seq"]),

     

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                message <-

     

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                  from_payload(type, payload) do

     

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             case message do

     

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               %Firehose.Commit{} = commit ->

     

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                 IO.inspect(commit.ops, label: commit.repo)

     

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               msg ->

     

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                 IO.inspect(msg)

     

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             end

     

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             {:ok, payload["seq"] || state}

     

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           else

     

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             false ->

     

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               Logger.error("Got out of sequence or invalid `seq` from Firehose")

     

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               {:ok, state}

     

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             {%{"op" => @op_error, "t" => type}, payload} ->

     

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               Logger.error("Got error from Firehose: #{inspect({type, payload})}")

     

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               {:ok, state}

     

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             {:error, reason} ->

     

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               Logger.warning("Failed to decode frame from Firehose: #{inspect(reason)}")

     

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               {:ok, state}

     

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           end

     

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         end

     

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         def handle_frame({:text, msg}, state) do

     

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           Logger.warning("Got unexpected text frame from Firehose: #{inspect(msg)}")

     

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           {:ok, state}

     

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         end

     

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         @spec valid_seq?(integer(), any()) :: boolean()

     

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         defp valid_seq?(last_seq, seq) when is_integer(seq), do: seq > last_seq

     

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         defp valid_seq?(_last_seq, _seq), do: false

     

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         @spec from_payload(String.t(), map()) ::

     

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                 Firehose.Commit.t()

     

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                 | Firehose.Sync.t()

     

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                 | Firehose.Identity.t()

     

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                 | Firehose.Account.t()

     

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                 | Firehose.Info.t()

     

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                 | nil

     

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         defp from_payload("#commit", payload), do: Firehose.Commit.from(payload)

     

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         defp from_payload("#sync", payload), do: Firehose.Sync.from(payload)

     

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         defp from_payload("#identity", payload), do: Firehose.Identity.from(payload)

     

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         defp from_payload("#account", payload), do: Firehose.Account.from(payload)

     

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         defp from_payload("#info", payload), do: Firehose.Info.from(payload)

     

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         defp from_payload(_type, _payload), do: nil

     

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       defmodule Drinkup do

     

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       end

+22

lib/event.ex

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       defmodule Drinkup.Event do

     

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         alias Drinkup.Event

     

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         @spec from(String.t(), map()) ::

     

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                 Event.Commit.t()

     

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                 | Event.Sync.t()

     

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                 | Event.Identity.t()

     

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                 | Event.Account.t()

     

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                 | Event.Info.t()

     

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                 | nil

     

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         def from("#commit", payload), do: Event.Commit.from(payload)

     

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         def from("#sync", payload), do: Event.Sync.from(payload)

     

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         def from("#identity", payload), do: Event.Identity.from(payload)

     

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         def from("#account", payload), do: Event.Account.from(payload)

     

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         def from("#info", payload), do: Event.Info.from(payload)

     

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         def from(_type, _payload), do: nil

     

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         @spec valid_seq?(integer() | nil, any()) :: boolean()

     

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         def valid_seq?(nil, seq) when is_integer(seq), do: true

     

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         def valid_seq?(last_seq, seq) when is_integer(last_seq) and is_integer(seq), do: seq > last_seq

     

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         def valid_seq?(_last_seq, _seq), do: false

     

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       end

+1 -1

lib/firehose/account.ex lib/event/account.ex

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       defmodule Drinkup.Firehose.Account do

     

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       defmodule Drinkup.Event.Account do

     

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         @moduledoc """

     

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         Struct for account events from the ATProto Firehose.

     

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         """

+1 -1

lib/firehose/commit.ex lib/event/commit.ex

···

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       defmodule Drinkup.Firehose.Commit do

     

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       defmodule Drinkup.Event.Commit do

     

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         @moduledoc """

     

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         Struct for commit events from the ATProto Firehose.

     

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         """

+1 -1

lib/firehose/identity.ex lib/event/identity.ex

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       defmodule Drinkup.Firehose.Identity do

     

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       defmodule Drinkup.Event.Identity do

     

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         @moduledoc """

     

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         Struct for identity events from the ATProto Firehose.

     

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         """

+1 -1

lib/firehose/info.ex lib/event/info.ex

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       defmodule Drinkup.Firehose.Info do

     

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       defmodule Drinkup.Event.Info do

     

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         @moduledoc """

     

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         Struct for info events from the ATProto Firehose.

     

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         """

+1 -1

lib/firehose/sync.ex lib/event/sync.ex

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       defmodule Drinkup.Firehose.Sync do

     

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       defmodule Drinkup.Event.Sync do

     

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         @moduledoc """

     

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         Struct for sync events from the ATProto Firehose.

     

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         """

+165

lib/socket.ex

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       defmodule Drinkup.Socket do

     

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         @moduledoc """

     

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         gen_statem process for managing the websocket connection to an ATProto relay.

     

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         """

     

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         require Logger

     

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         alias Drinkup.Event

     

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         @behaviour :gen_statem

     

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         @default_host "https://bsky.network"

     

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         @timeout :timer.seconds(5)

     

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         # TODO: `flow` determines messages in buffer. Determine ideal value?

     

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         @flow 10

     

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         @op_regular 1

     

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         @op_error -1

     

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         defstruct [:host, :seq, :conn, :stream]

     

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         @impl true

     

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         def callback_mode, do: [:state_functions, :state_enter]

     

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         def start_link(opts \\ []) do

     

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           opts = Keyword.validate!(opts, host: @default_host)

     

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           host = Keyword.get(opts, :host)

     

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           cursor = Keyword.get(opts, :cursor)

     

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           :gen_statem.start_link(__MODULE__, {host, cursor}, [])

     

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         end

     

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         @impl true

     

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         def init({host, cursor}) do

     

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           data = %__MODULE__{host: host, seq: cursor}

     

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           {:ok, :disconnected, data, [{:next_event, :internal, :connect}]}

     

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         end

     

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         def disconnected(:enter, _from, data) do

     

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           Logger.debug("Initial connection")

     

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           # TODO: differentiate between initial & reconnects, probably stuff to do with seq

     

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           {:next_state, :disconnected, data}

     

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         end

     

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         def disconnected(:internal, :connect, data) do

     

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           {:next_state, :connecting_http, data}

     

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         end

     

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         def connecting_http(:enter, _from, data) do

     

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           Logger.debug("Connecting to http")

     

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           %{host: host, port: port} = URI.new!(data.host)

     

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           {:ok, conn} =

     

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             :gun.open(:binary.bin_to_list(host), port, %{

     

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               retry: 0,

     

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               protocols: [:http],

     

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               connect_timeout: @timeout,

     

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               domain_lookup_timeout: @timeout,

     

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               tls_handshake_timeout: @timeout,

     

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               tls_opts: [

     

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                 verify: :verify_peer,

     

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                 cacerts: :certifi.cacerts(),

     

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                 depth: 3,

     

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                 customize_hostname_check: [

     

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                   match_fun: :public_key.pkix_verify_hostname_match_fun(:https)

     

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                 ]

     

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               ]

     

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             })

     

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           {:keep_state, %{data | conn: conn}, [{:state_timeout, @timeout, :connect_timeout}]}

     

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         end

     

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         def connecting_http(:info, {:gun_up, _conn, :http}, data) do

     

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           {:next_state, :connecting_ws, data}

     

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         end

     

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         def connecting_http(:state_timeout, :connect_timeout, _data) do

     

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           {:stop, :connect_http_timeout}

     

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         end

     

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         def connecting_ws(:enter, _from, %{conn: conn, seq: seq} = data) do

     

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           Logger.debug("Upgrading connection to websocket")

     

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           path = "/xrpc/com.atproto.sync.subscribeRepos?" <> URI.encode_query(%{cursor: seq})

     

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           stream = :gun.ws_upgrade(conn, path, [], %{flow: @flow})

     

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           {:keep_state, %{data | stream: stream}, [{:state_timeout, @timeout, :upgrade_timeout}]}

     

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         end

     

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         def connecting_ws(:info, {:gun_upgrade, _conn, _stream, ["websocket"], _headers}, data) do

     

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           {:next_state, :connected, data}

     

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         end

     

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         def connecting_ws(:state_timeout, :upgrade_timeout, _data) do

     

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           {:stop, :connect_ws_timeout}

     

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         end

     

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         def connected(:enter, _from, _data) do

     

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           Logger.debug("Connected to websocket")

     

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           :keep_state_and_data

     

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         end

     

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         def connected(:info, {:gun_ws, conn, stream, {:binary, frame}}, data) do

     

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           # TODO: let clients specify a handler for raw* (*decoded) packets to support any atproto subscription

     

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           # Will also need support for JSON frames

     

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           with {:ok, header, next} <- CAR.DagCbor.decode(frame),

     

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                {:ok, payload, _} <- CAR.DagCbor.decode(next),

     

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                {%{"op" => @op_regular, "t" => type}, _} <- {header, payload},

     

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                true <- type == "#info" || Event.valid_seq?(data.seq, payload["seq"]),

     

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                data <- %{data | seq: payload["seq"] || data.seq},

     

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                message <-

     

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                  Event.from(type, payload) do

     

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             :ok = :gun.update_flow(conn, stream, @flow)

     

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             case message do

     

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               %Event.Commit{} = commit ->

     

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                 IO.inspect(commit.ops, label: commit.repo)

     

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       +
       

     

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               msg ->

     

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                 IO.inspect(msg)

     

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             end

     

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             {:keep_state, data}

     

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           else

     

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             false ->

     

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               Logger.error("Got out of sequence or invalid `seq` from Firehose")

     

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               {:keep_state, data}

     

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       +
       

     

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             {%{"op" => @op_error, "t" => type}, payload} ->

     

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               Logger.error("Got error from Firehose: #{inspect({type, payload})}")

     

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               {:keep_state, data}

     

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       +
       

     

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             {:error, reason} ->

     

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               Logger.warning("Failed to decode frame from Firehose: #{inspect(reason)}")

     

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               {:keep_state, data}

     

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           end

     

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         end

     

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         def connected(:info, {:gun_ws, _conn, _stream, :close}, _data) do

     

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           Logger.info("Websocket closed, reason unknown")

     

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           {:keep_state_and_data, [{:next_event, :internal, :reconnect}]}

     

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         end

     

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         def connected(:info, {:gun_ws, _conn, _stream, {:close, errno, reason}}, _data) do

     

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           Logger.info("Websocket closed, errno: #{errno}, reason: #{inspect(reason)}")

     

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           {:keep_state_and_data, [{:next_event, :internal, :reconnect}]}

     

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         end

     

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         def connected(:info, {:gun_down, old_conn, _proto, _reason, _killed_streams}, %{conn: new_conn})

     

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             when old_conn != new_conn do

     

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           Logger.debug("Ignoring received :gun_down for a previous connection.")

     

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           :keep_state_and_data

     

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         end

     

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       +
       

     

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         def connected(:info, {:gun_down, _conn, _proto, _reason, _killed_streams}, _data) do

     

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           Logger.info("Websocket connection killed. Attempting to reconnect")

     

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           {:keep_state_and_data, [{:next_event, :internal, :reconnect}]}

     

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         end

     

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       +
       

     

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         def connected(:internal, :reconnect, %{conn: conn} = data) do

     

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           :ok = :gun.close(conn)

     

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           :ok = :gun.flush(conn)

     

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       +
       

     

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           # TODO: reconnect backoff

     

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           {:next_state, :disconnected, %{data | conn: nil, stream: nil},

     

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            [{:next_event, :internal, :connect}]}

     

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         end

     

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       end

+4 -3

mix.exs

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         # Run "mix help deps" to learn about dependencies.

     

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         defp deps do

     

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           [

     

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       -
             {:cbor, "~> 1.0.0"},

     

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             {:car, "~> 0.1.0"},

     

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             {:cbor, "~> 1.0.0"},

     

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             {:certifi, "~> 2.15"},

     

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             {:credo, "~> 1.7", only: [:dev, :test], runtime: false},

     

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       -
             {:typedstruct, "~> 0.5"},

     

       28
       28
       -
             {:websockex, "~> 0.5.0", hex: :websockex_wt}

     

       28
       28
       +
             {:gun, "~> 2.2"},

     

       29
       29
       +
             {:typedstruct, "~> 0.5"}

     

       29
       30
        
           ]

     

       30
       31
        
         end

     

       31
       32
        
       end

+3 -2

mix.lock

···

       2
       2
        
         "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},

     

       3
       3
        
         "car": {:hex, :car, "0.1.1", "a5bc4c5c1be96eab437634b3c0ccad1fe17b5e3d68c22a4031241ae1345aebd4", [:mix], [{:cbor, "~> 1.0.0", [hex: :cbor, repo: "hexpm", optional: false]}, {:typedstruct, "~> 0.5", [hex: :typedstruct, repo: "hexpm", optional: false]}, {:varint, "~> 1.4", [hex: :varint, repo: "hexpm", optional: false]}], "hexpm", "f895dda8123d04dd336db5a2bf0d0b47f4559cd5383f83fcca0700c1b45bfb6a"},

     

       4
       4
        
         "cbor": {:hex, :cbor, "1.0.1", "39511158e8ea5a57c1fcb9639aaa7efde67129678fee49ebbda780f6f24959b0", [:mix], [], "hexpm", "5431acbe7a7908f17f6a9cd43311002836a34a8ab01876918d8cfb709cd8b6a2"},

     

       5
       5
       +
         "certifi": {:hex, :certifi, "2.15.0", "0e6e882fcdaaa0a5a9f2b3db55b1394dba07e8d6d9bcad08318fb604c6839712", [:rebar3], [], "hexpm", "b147ed22ce71d72eafdad94f055165c1c182f61a2ff49df28bcc71d1d5b94a60"},

     

       6
       6
       +
         "cowlib": {:hex, :cowlib, "2.15.0", "3c97a318a933962d1c12b96ab7c1d728267d2c523c25a5b57b0f93392b6e9e25", [:make, :rebar3], [], "hexpm", "4f00c879a64b4fe7c8fcb42a4281925e9ffdb928820b03c3ad325a617e857532"},

     

       5
       7
        
         "credo": {:hex, :credo, "1.7.12", "9e3c20463de4b5f3f23721527fcaf16722ec815e70ff6c60b86412c695d426c1", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8493d45c656c5427d9c729235b99d498bd133421f3e0a683e5c1b561471291e5"},

     

       6
       8
        
         "file_system": {:hex, :file_system, "1.1.0", "08d232062284546c6c34426997dd7ef6ec9f8bbd090eb91780283c9016840e8f", [:mix], [], "hexpm", "bfcf81244f416871f2a2e15c1b515287faa5db9c6bcf290222206d120b3d43f6"},

     

       9
       9
       +
         "gun": {:hex, :gun, "2.2.0", "b8f6b7d417e277d4c2b0dc3c07dfdf892447b087f1cc1caff9c0f556b884e33d", [:make, :rebar3], [{:cowlib, ">= 2.15.0 and < 3.0.0", [hex: :cowlib, repo: "hexpm", optional: false]}], "hexpm", "76022700c64287feb4df93a1795cff6741b83fb37415c40c34c38d2a4645261a"},

     

       7
       10
        
         "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},

     

       8
       8
       -
         "telemetry": {:hex, :telemetry, "1.3.0", "fedebbae410d715cf8e7062c96a1ef32ec22e764197f70cda73d82778d61e7a2", [:rebar3], [], "hexpm", "7015fc8919dbe63764f4b4b87a95b7c0996bd539e0d499be6ec9d7f3875b79e6"},

     

       9
       11
        
         "typedstruct": {:hex, :typedstruct, "0.5.3", "d68ae424251a41b81a8d0c485328ab48edbd3858f3565bbdac21b43c056fc9b4", [:make, :mix], [], "hexpm", "b53b8186701417c0b2782bf02a2db5524f879b8488f91d1d83b97d84c2943432"},

     

       10
       12
        
         "varint": {:hex, :varint, "1.5.1", "17160c70d0428c3f8a7585e182468cac10bbf165c2360cf2328aaa39d3fb1795", [:mix], [], "hexpm", "24f3deb61e91cb988056de79d06f01161dd01be5e0acae61d8d936a552f1be73"},

     

       11
       11
       -
         "websockex": {:hex, :websockex_wt, "0.5.0", "8725b3bc741e7a682c21310610d033f0aaeedfb3238d9c8d5522c345c04f3f93", [:mix], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "f854a5e7dbd61e852ee74565d862d606e884425c8867ddaa49c8a6c6f43d832a"},

     

       12
       13
        
       }