1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
defmodule Cepis.RetryTest do
use Cepis.ServerCase
test "a 500 is retried and the second attempt wins", %{server: server, client: client} do
FakeServer.respond(server, "/01001000", [
{500, json(%{"erro" => "interno"}), []},
{200, json(address_fixture()), []}
])
assert {:ok, address} = Cepis.lookup("01001000", client)
assert address.localidade == "São Paulo"
assert FakeServer.count(server, "/01001000") == 2
end
test "attempts are exhausted and then it gives up", %{server: server, client: client} do
FakeServer.respond(server, "/01001000", {503, json(%{"erro" => "interno"}), []})
assert {:error, %Cepis.ServerError{status: 503}} = Cepis.lookup("01001000", client)
assert FakeServer.count(server, "/01001000") == 3
end
test "max_attempts: 1 disables retrying", %{server: server} do
client = Cepis.Client.new(base_url: server.url, max_attempts: 1, timeout: 5_000)
FakeServer.respond(server, "/01001000", {500, "{}", []})
assert {:error, %Cepis.ServerError{status: 500}} = Cepis.lookup("01001000", client)
assert FakeServer.count(server, "/01001000") == 1
end
test "a 429 exposes Retry-After in milliseconds", %{server: server, client: client} do
FakeServer.respond(server, "/01001000", {429, "{}", [{"retry-after", "7"}]})
assert {:error, %Cepis.RateLimitError{retry_after: 7_000}} = Cepis.lookup("01001000", client)
end
test "a Retry-After HTTP date is understood", %{server: server, client: client} do
date =
DateTime.utc_now()
|> DateTime.add(30, :second)
|> Calendar.strftime("%a, %d %b %Y %H:%M:%S GMT")
FakeServer.respond(server, "/01001000", {429, "{}", [{"retry-after", date}]})
assert {:error, %Cepis.RateLimitError{retry_after: retry_after}} =
Cepis.lookup("01001000", client)
assert retry_after > 20_000
assert retry_after <= 30_000
end
test "an absurd Retry-After cannot park the caller", %{server: server, client: client} do
FakeServer.respond(server, "/01001000", {429, "{}", [{"retry-after", "3600"}]})
{elapsed, result} = :timer.tc(fn -> Cepis.lookup("01001000", client) end, :millisecond)
assert {:error, %Cepis.RateLimitError{}} = result
assert elapsed < 2_000
end
test "nothing listening is a network error" do
client =
Cepis.Client.new(
base_url: "http://127.0.0.1:1",
max_attempts: 2,
backoff_base: 1,
timeout: 1_000
)
assert {:error, %Cepis.NetworkError{}} = Cepis.lookup("01001000", client)
end
test "total_timeout bounds the whole call", %{server: server} do
client =
Cepis.Client.new(
base_url: server.url,
max_attempts: 50,
backoff_base: 50,
backoff_max: 50,
total_timeout: 300
)
FakeServer.respond(server, "/01001000", {500, "{}", []})
{elapsed, result} = :timer.tc(fn -> Cepis.lookup("01001000", client) end, :millisecond)
assert {:error, %Cepis.ServerError{}} = result
assert elapsed < 3_000
assert FakeServer.count(server, "/01001000") < 50
end
end
|