github.com/google/fleetspeak@v0.1.15-0.20240426164851-4f31f62c1aea/fleetspeak/src/server/internal/ftime/retry.go (about)

     1  // Copyright 2017 Google Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     https://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ftime
    16  
    17  import (
    18  	"math"
    19  	"math/rand"
    20  	"time"
    21  )
    22  
    23  // ClientRetryTime determines how long to wait for an acknowledgement before
    24  // sending a message to a client again. The normal implementation waits 15
    25  // minutes. It is mutable primarily to support testing.
    26  var ClientRetryTime = func() time.Time {
    27  	return Now().Add(15 * time.Minute)
    28  }
    29  
    30  // ServerRetryTime determines how long to wait before attempting to process a
    31  // message again on the FS server. The normal implementation provides
    32  // exponential backoff with jitter, with an initial wait of 1-2 min. It is
    33  // mutable primarily to support testing.
    34  var ServerRetryTime = func(retryCount uint32) time.Time {
    35  	delay := float64(time.Minute) * math.Pow(1.1, float64(retryCount))
    36  	delay *= 1.0 + rand.Float64()
    37  
    38  	return Now().Add(time.Duration(delay))
    39  }