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diff --git a/lib/tesla/middleware/retry.ex b/lib/tesla/middleware/retry.ex
index 3dc6778..62b83c2 100644
--- a/lib/tesla/middleware/retry.ex
+++ b/lib/tesla/middleware/retry.ex
@@ -1,50 +1,58 @@
defmodule Tesla.Middleware.Retry do
@behaviour Tesla.Middleware
@moduledoc """
- Retry few times in case of connection error (`nxdomain`, `connrefused` etc).
- This middleware will NOT retry in case of application error (HTTP status 5xx).
+ Retry the HTTP call in case of connection error by default (`nxdomain`, `connrefused` etc).
+ Application error checking for retry can be customized through should_retry options by
+ providing a function in returning a boolean.
### Example
```
defmodule MyClient do
use Tesla
- plug Tesla.Middleware.Retry, delay: 500, max_retries: 10
+ plug Tesla.Middleware.Retry,
+ delay: 500,
+ max_retries: 10,
+ should_retry: fn
+ {:ok, %{status: status}} when status in [400, 500] -> true
+ {:ok, _} -> false
+ {:error, _} -> true
+ end
end
```
### Options
- `:delay` - number of milliseconds to wait before retrying (defaults to 1000)
- `:max_retries` - maximum number of retries (defaults to 5)
- - `:should_retry` - function to determine it should be retried
+ - `:should_retry` - function to determine Tesla should be retried
"""
@defaults [
delay: 1000,
max_retries: 5
]
@doc false
def call(env, next, opts) do
opts = opts || []
delay = Keyword.get(opts, :delay, @defaults[:delay])
max_retries = Keyword.get(opts, :max_retries, @defaults[:max_retries])
should_retry = Keyword.get(opts, :should_retry, &match?({:error, _}, &1))
retry(env, next, delay, max_retries, should_retry)
end
defp retry(env, next, _delay, retries, _should_retry) when retries <= 1 do
Tesla.run(env, next)
end
defp retry(env, next, delay, retries, should_retry) do
if should_retry.(Tesla.run(env, next)) do
:timer.sleep(delay)
retry(env, next, delay, retries - 1, should_retry)
else
{:ok, env}
end
end
end

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