github.com/tickoalcantara12/micro/v3@v3.0.0-20221007104245-9d75b9bcbab9/util/backoff/backoff.go (about)

     1  // Licensed under the Apache License, Version 2.0 (the "License");
     2  // you may not use this file except in compliance with the License.
     3  // You may obtain a copy of the License at
     4  //
     5  //     https://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS,
     9  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    10  // See the License for the specific language governing permissions and
    11  // limitations under the License.
    12  //
    13  // Original source: github.com/micro/go-micro/v3/util/backoff/backoff.go
    14  
    15  // Package backoff provides backoff functionality
    16  package backoff
    17  
    18  import (
    19  	"math"
    20  	"time"
    21  )
    22  
    23  // Do is a function x^e multiplied by a factor of 0.1 second.
    24  // Result is limited to 2 minute.
    25  func Do(attempts int) time.Duration {
    26  	if attempts > 13 {
    27  		return 2 * time.Minute
    28  	}
    29  	return time.Duration(math.Pow(float64(attempts), math.E)) * time.Millisecond * 100
    30  }