github.com/m3db/m3@v1.5.0/src/x/retry/config.go (about)

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package retry
    22  
    23  import (
    24  	"time"
    25  
    26  	"github.com/uber-go/tally"
    27  )
    28  
    29  // Configuration configures options for retry attempts.
    30  type Configuration struct {
    31  	// Initial retry backoff.
    32  	InitialBackoff time.Duration `yaml:"initialBackoff" validate:"min=0"`
    33  
    34  	// Backoff factor for exponential backoff.
    35  	BackoffFactor float64 `yaml:"backoffFactor" validate:"min=0"`
    36  
    37  	// Maximum backoff time.
    38  	MaxBackoff time.Duration `yaml:"maxBackoff" validate:"min=0"`
    39  
    40  	// Maximum number of retry attempts.
    41  	MaxRetries int `yaml:"maxRetries"`
    42  
    43  	// Whether to retry forever until either the attempt succeeds,
    44  	// or the retry condition becomes false.
    45  	Forever *bool `yaml:"forever"`
    46  
    47  	// Whether jittering is applied during retries.
    48  	Jitter *bool `yaml:"jitter"`
    49  }
    50  
    51  // NewOptions creates a new retry options based on the configuration.
    52  func (c Configuration) NewOptions(scope tally.Scope) Options {
    53  	opts := NewOptions().SetMetricsScope(scope)
    54  	if c.InitialBackoff != 0 {
    55  		opts = opts.SetInitialBackoff(c.InitialBackoff)
    56  	}
    57  	if c.BackoffFactor != 0.0 {
    58  		opts = opts.SetBackoffFactor(c.BackoffFactor)
    59  	}
    60  	if c.MaxBackoff != 0 {
    61  		opts = opts.SetMaxBackoff(c.MaxBackoff)
    62  	}
    63  	if c.MaxRetries != 0 {
    64  		opts = opts.SetMaxRetries(c.MaxRetries)
    65  	}
    66  	if c.Forever != nil {
    67  		opts = opts.SetForever(*c.Forever)
    68  	}
    69  	if c.Jitter != nil {
    70  		opts = opts.SetJitter(*c.Jitter)
    71  	}
    72  
    73  	return opts
    74  }
    75  
    76  // NewRetrier creates a new retrier based on the configuration.
    77  func (c Configuration) NewRetrier(scope tally.Scope) Retrier {
    78  	return NewRetrier(c.NewOptions(scope))
    79  }