example_test.go

Documentation: github.com/cenkalti/backoff/v4

     1  package backoff
     2  
     3  import (
     4  	"context"
     5  	"log"
     6  )
     7  
     8  func ExampleRetry() {
     9  	// An operation that may fail.
    10  	operation := func() error {
    11  		return nil // or an error
    12  	}
    13  
    14  	err := Retry(operation, NewExponentialBackOff())
    15  	if err != nil {
    16  		// Handle error.
    17  		return
    18  	}
    19  
    20  	// Operation is successful.
    21  }
    22  
    23  func ExampleRetryContext() { // nolint: govet
    24  	// A context
    25  	ctx := context.Background()
    26  
    27  	// An operation that may fail.
    28  	operation := func() error {
    29  		return nil // or an error
    30  	}
    31  
    32  	b := WithContext(NewExponentialBackOff(), ctx)
    33  
    34  	err := Retry(operation, b)
    35  	if err != nil {
    36  		// Handle error.
    37  		return
    38  	}
    39  
    40  	// Operation is successful.
    41  }
    42  
    43  func ExampleTicker() {
    44  	// An operation that may fail.
    45  	operation := func() error {
    46  		return nil // or an error
    47  	}
    48  
    49  	ticker := NewTicker(NewExponentialBackOff())
    50  
    51  	var err error
    52  
    53  	// Ticks will continue to arrive when the previous operation is still running,
    54  	// so operations that take a while to fail could run in quick succession.
    55  	for range ticker.C {
    56  		if err = operation(); err != nil {
    57  			log.Println(err, "will retry...")
    58  			continue
    59  		}
    60  
    61  		ticker.Stop()
    62  		break
    63  	}
    64  
    65  	if err != nil {
    66  		// Operation has failed.
    67  		return
    68  	}
    69  
    70  	// Operation is successful.
    71  }
    72
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