Make ExponentialBackoff and LinearBackoff require keyword arguments

The `ExponentialBackoff` and `LinearBackoff` classes now require keyword
arguments for their constructor. This change was made to make the
classes easier to use and to avoid confusion with the order of the
arguments.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

RELEASE_NOTES.md

@@ -8,6 +8,7 @@
 
 - `GrpcStreamBroadcaster` now takes a `AsyncIterable` instead of a `AsyncIterator` as the `stream_method`. This is to match the type of streaming methods generated by `grpc`, so no conversion to an `AsyncIterator` is needed.
 - gRPC URLs don't have a default port anymore, unless a default is set via `ChannelOptions`. If you want to set a default port for URLs, please pass custom `ChannelOptions` as `defaults` to `parse_grpc_uri` or as `channel_defaults` to `BaseApiClient`.
+* The `ExponentialBackoff` and `LinearBackoff` classes now require keyword arguments for their constructor. This change was made to make the classes easier to use and to avoid confusion with the order of the arguments.
 
 ## New Features
 

src/frequenz/client/base/retry.py

@@ -79,6 +79,7 @@ class LinearBackoff(Strategy):
 
     def __init__(
         self,
+        *,
         interval: float = DEFAULT_RETRY_INTERVAL,
         jitter: float = DEFAULT_RETRY_JITTER,
         limit: int | None = None,
@@ -124,9 +125,9 @@ class ExponentialBackoff(Strategy):
     DEFAULT_MULTIPLIER = 2.0
     """Default multiplier for exponential increment."""
 
-    # pylint: disable=too-many-arguments
-    def __init__(
+    def __init__(  # pylint: disable=too-many-arguments
         self,
+        *,
         initial_interval: float = DEFAULT_INTERVAL,
         max_interval: float = DEFAULT_MAX_INTERVAL,
         multiplier: float = DEFAULT_MULTIPLIER,

tests/retry_strategy/test_retry_strategy.py

@@ -23,7 +23,7 @@ def test_no_limit(self) -> None:
 
     def test_iter(self) -> None:
         """Test iterator."""
-        assert list(retry.LinearBackoff(1, 0, 3)) == [1, 1, 1]
+        assert list(retry.LinearBackoff(interval=1, jitter=0, limit=3)) == [1, 1, 1]
 
     def test_with_limit(self) -> None:
         """Test limit works."""
@@ -89,7 +89,7 @@ def test_with_jitter_with_limit(self) -> None:
 
     def test_deep_copy(self) -> None:
         """Test if deep copies are really deep copies."""
-        strategy = retry.LinearBackoff(1.0, 0.0, 2)
+        strategy = retry.LinearBackoff(interval=1.0, jitter=0.0, limit=2)
 
         copy1 = strategy.copy()
         assert copy1.next_interval() == 1.0
@@ -108,7 +108,9 @@ class TestExponentialBackoff:
 
     def test_no_limit(self) -> None:
         """Test base case."""
-        strategy = retry.ExponentialBackoff(3, 30, 2, 0.0)
+        strategy = retry.ExponentialBackoff(
+            initial_interval=3, max_interval=30, multiplier=2, jitter=0.0
+        )
 
         assert strategy.next_interval() == 3.0
         assert strategy.next_interval() == 6.0
@@ -119,7 +121,7 @@ def test_no_limit(self) -> None:
 
     def test_with_limit(self) -> None:
         """Test limit works."""
-        strategy = retry.ExponentialBackoff(3, jitter=0.0, limit=3)
+        strategy = retry.ExponentialBackoff(initial_interval=3, jitter=0.0, limit=3)
 
         assert strategy.next_interval() == 3.0
         assert strategy.next_interval() == 6.0
@@ -128,7 +130,9 @@ def test_with_limit(self) -> None:
 
     def test_deep_copy(self) -> None:
         """Test if deep copies are really deep copies."""
-        strategy = retry.ExponentialBackoff(3.0, 30.0, 2, 0.0, 2)
+        strategy = retry.ExponentialBackoff(
+            initial_interval=3.0, max_interval=30.0, multiplier=2, jitter=0.0, limit=2
+        )
 
         copy1 = strategy.copy()
         assert copy1.next_interval() == 3.0