comet.sh
ovyerus.com
+1
-1
.formatter.exs
+1
-1
.formatter.exs
+8
README.md
+8
README.md
···
2
2
3
3
Drinkup is an ELixir library for listening to events from an ATProtocol
4
4
firehose.
5
+
6
+
## Roadmap
7
+
8
+
- Support for different subscriptions other than
9
+
`com.atproto.sync.subscribeRepo'
10
+
- Support for multiple instances at once, each with unique consumers (for
11
+
listening to multiple subscriptions at once)
12
+
- Tests
+33
examples/record_consumer.ex
+33
examples/record_consumer.ex
···
1
+
defmodule ExampleRecordConsumer do
2
+
use Drinkup.RecordConsumer, collections: [~r/app\.bsky\.graph\..+/, "app.bsky.feed.post"]
3
+
4
+
def handle_create(record) do
5
+
IO.inspect(record, label: "create")
6
+
end
7
+
8
+
def handle_update(record) do
9
+
IO.inspect(record, label: "update")
10
+
end
11
+
12
+
def handle_delete(record) do
13
+
IO.inspect(record, label: "delete")
14
+
end
15
+
end
16
+
17
+
defmodule ExampleSupervisor do
18
+
use Supervisor
19
+
20
+
def start_link(args \\ []) do
21
+
Supervisor.start_link(__MODULE__, arg, name: __MODULE__)
22
+
end
23
+
24
+
@immpl true
25
+
def init(_arg) do
26
+
children = [
27
+
Drinkup,
28
+
ExampleRecordConsumer
29
+
]
30
+
31
+
Supervisor.init(children, strategy: :one_for_one)
32
+
end
33
+
end
+85
lib/record_consumer.ex
+85
lib/record_consumer.ex
···
1
+
defmodule Drinkup.RecordConsumer do
2
+
@moduledoc """
3
+
An opinionated consumer of the Firehose that eats consumers
4
+
"""
5
+
6
+
@callback handle_create(any()) :: any()
7
+
@callback handle_update(any()) :: any()
8
+
@callback handle_delete(any()) :: any()
9
+
10
+
defmacro __using__(opts) do
11
+
{collections, _opts} = Keyword.pop(opts, :collections, [])
12
+
13
+
quote location: :keep do
14
+
use Drinkup.Consumer
15
+
@behaviour Drinkup.RecordConsumer
16
+
17
+
def handle_event(%Drinkup.Event.Commit{} = event) do
18
+
event.ops
19
+
|> Enum.filter(fn %{path: path} ->
20
+
path |> String.split("/") |> Enum.at(0) |> matches_collections?()
21
+
end)
22
+
|> Enum.map(&Drinkup.RecordConsumer.Record.from(&1, event.repo))
23
+
|> Enum.each(&apply(__MODULE__, :"handle_#{&1.action}", [&1]))
24
+
end
25
+
26
+
def handle_event(_event), do: :noop
27
+
28
+
unquote(
29
+
if collections == [] do
30
+
quote do
31
+
def matches_collections?(_type), do: true
32
+
end
33
+
else
34
+
quote do
35
+
def matches_collections?(nil), do: false
36
+
37
+
def matches_collections?(type) when is_binary(type),
38
+
do:
39
+
Enum.any?(unquote(collections), fn
40
+
matcher when is_binary(matcher) -> type == matcher
41
+
matcher -> Regex.match?(matcher, type)
42
+
end)
43
+
end
44
+
end
45
+
)
46
+
47
+
@impl true
48
+
def handle_create(_record), do: nil
49
+
@impl true
50
+
def handle_update(_record), do: nil
51
+
@impl true
52
+
def handle_delete(_record), do: nil
53
+
54
+
defoverridable handle_create: 1, handle_update: 1, handle_delete: 1
55
+
end
56
+
end
57
+
58
+
defmodule Record do
59
+
alias Drinkup.Event.Commit.RepoOp
60
+
use TypedStruct
61
+
62
+
typedstruct do
63
+
field :type, String.t()
64
+
field :rkey, String.t()
65
+
field :did, String.t()
66
+
field :action, :create | :update | :delete
67
+
field :cid, binary() | nil
68
+
field :record, map() | nil
69
+
end
70
+
71
+
@spec from(RepoOp.t(), String.t()) :: t()
72
+
def from(%RepoOp{action: action, path: path, cid: cid, record: record}, did) do
73
+
[type, rkey] = String.split(path, "/")
74
+
75
+
%__MODULE__{
76
+
type: type,
77
+
rkey: rkey,
78
+
did: did,
79
+
action: action,
80
+
cid: cid,
81
+
record: record
82
+
}
83
+
end
84
+
end
85
+
end