Executes fun until it succeeds or we have run out of retry_delays. Each retry is preceded by a sleep of the specified retry delay.

Returns stream of delays that are exponentially increasing. Stream halts once the specified budget of milliseconds has elapsed.

Returns stream that returns specified number of the specified delay.

Retry block of code with a exponential backoff delay between attempts.

Example

backoff 1000, delay_cap: 100 do
  # interact the external service
end

Runs the block repeated until it succeeds or 1 second elapses with an exponentially increasing delay between attempts. Execution is deemed a failure if the block returns {:error, _} or raises a runtime error.

The delay_cap is optional. If specified it will be the max duration of any delay. In the example this is saying never delay more than 100ms between attempts. Omitting delay_cap is the same as setting it to :infinity.

Retry block of code a maximum number of times with a fixed delay between attempts.

Example

retry 5 in 500 do
  # interact with external service
end

Runs the block up to 5 times with a half second sleep between each attempt. Execution is deemed a failure if the block returns {:error, _} or raises a runtime error.