set_retry: add retries remaining parameter to the provided function (#4251)

esphome/core/component.cpp

@@ -57,7 +57,7 @@ bool Component::cancel_interval(const std::string &name) {  // NOLINT
 }
 
 void Component::set_retry(const std::string &name, uint32_t initial_wait_time, uint8_t max_attempts,
-                          std::function<RetryResult()> &&f, float backoff_increase_factor) {  // NOLINT
+                          std::function<RetryResult(uint8_t)> &&f, float backoff_increase_factor) {  // NOLINT
   App.scheduler.set_retry(this, name, initial_wait_time, max_attempts, std::move(f), backoff_increase_factor);
 }
 
@@ -130,7 +130,7 @@ void Component::set_timeout(uint32_t timeout, std::function<void()> &&f) {  // N
 void Component::set_interval(uint32_t interval, std::function<void()> &&f) {  // NOLINT
   App.scheduler.set_interval(this, "", interval, std::move(f));
 }
-void Component::set_retry(uint32_t initial_wait_time, uint8_t max_attempts, std::function<RetryResult()> &&f,
+void Component::set_retry(uint32_t initial_wait_time, uint8_t max_attempts, std::function<RetryResult(uint8_t)> &&f,
                           float backoff_increase_factor) {  // NOLINT
   App.scheduler.set_retry(this, "", initial_wait_time, max_attempts, std::move(f), backoff_increase_factor);
 }

esphome/core/component.h

@@ -193,6 +193,9 @@ class Component {
    * increased by multipling by `backoff_increase_factor` each time. If no backoff_increase_factor is
    * supplied (default = 1.0), the wait time will stay constant.
    *
+   * The retry function f needs to accept a single argument: the number of attempts remaining. On the
+   * final retry of f, this value will be 0.
+   *
    * This retry function can also be cancelled by name via cancel_retry().
    *
    * IMPORTANT: Do not rely on this having correct timing. This is only called from
@@ -211,9 +214,9 @@ class Component {
    * @see cancel_retry()
    */
   void set_retry(const std::string &name, uint32_t initial_wait_time, uint8_t max_attempts,       // NOLINT
-                 std::function<RetryResult()> &&f, float backoff_increase_factor = 1.0f);    // NOLINT
+                 std::function<RetryResult(uint8_t)> &&f, float backoff_increase_factor = 1.0f);  // NOLINT
 
-  void set_retry(uint32_t initial_wait_time, uint8_t max_attempts, std::function<RetryResult()> &&f,  // NOLINT
+  void set_retry(uint32_t initial_wait_time, uint8_t max_attempts, std::function<RetryResult(uint8_t)> &&f,  // NOLINT
                  float backoff_increase_factor = 1.0f);                                                      // NOLINT
 
   /** Cancel a retry function.

esphome/core/scheduler.cpp

@@ -74,7 +74,7 @@ bool HOT Scheduler::cancel_interval(Component *component, const std::string &nam
 }
 
 struct RetryArgs {
-  std::function<RetryResult()> func;
+  std::function<RetryResult(uint8_t)> func;
   uint8_t retry_countdown;
   uint32_t current_interval;
   Component *component;
@@ -84,17 +84,18 @@ struct RetryArgs {
 };
 
 static void retry_handler(const std::shared_ptr<RetryArgs> &args) {
-  RetryResult retry_result = args->func();
+  RetryResult const retry_result = args->func(--args->retry_countdown);
-  if (retry_result == RetryResult::DONE || --args->retry_countdown <= 0)
+  if (retry_result == RetryResult::DONE || args->retry_countdown <= 0)
     return;
-  // second execution of `func` hapens after `initial_wait_time`
+  // second execution of `func` happens after `initial_wait_time`
   args->scheduler->set_timeout(args->component, args->name, args->current_interval, [args]() { retry_handler(args); });
   // backoff_increase_factor applied to third & later executions
   args->current_interval *= args->backoff_increase_factor;
 }
 
 void HOT Scheduler::set_retry(Component *component, const std::string &name, uint32_t initial_wait_time,
-                              uint8_t max_attempts, std::function<RetryResult()> func, float backoff_increase_factor) {
+                              uint8_t max_attempts, std::function<RetryResult(uint8_t)> func,
+                              float backoff_increase_factor) {
   if (!name.empty())
     this->cancel_retry(component, name);
 

esphome/core/scheduler.h

@@ -16,7 +16,7 @@ class Scheduler {
   bool cancel_interval(Component *component, const std::string &name);
 
   void set_retry(Component *component, const std::string &name, uint32_t initial_wait_time, uint8_t max_attempts,
-                 std::function<RetryResult()> func, float backoff_increase_factor = 1.0f);
+                 std::function<RetryResult(uint8_t)> func, float backoff_increase_factor = 1.0f);
   bool cancel_retry(Component *component, const std::string &name);
 
   optional<uint32_t> next_schedule_in();

tests/test2.yaml

@@ -462,6 +462,15 @@ binary_sensor:
       name: Mi Motion Sensor 2 Light
     button:
       name: Mi Motion Sensor 2 Button
+  - platform: gpio
+    id: gpio_set_retry_test
+    pin: GPIO9
+    on_press:
+      then:
+        - lambda: |-
+            App.scheduler.set_retry(id(gpio_set_retry_test), "set_retry_test", 100, 3, [](const uint8_t remaining) {
+              return remaining ? RetryResult::RETRY : RetryResult::DONE; // just to reference both symbols
+            }, 5.0f);
 
 esp32_ble_tracker:
   on_ble_advertise: