go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/cv/internal/retention/common.go (about)

     1  // Copyright 2024 The LUCI Authors.
     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  //      http://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 retention
    16  
    17  import (
    18  	"errors"
    19  	"time"
    20  )
    21  
    22  var retentionPeriod = 540 * 24 * time.Hour // ~= 1.5 years
    23  // wipeoutTasksDistInterval defines the interval that wipeout tasks will be
    24  // evenly distributed.
    25  var wipeoutTasksDistInterval = 1 * time.Hour
    26  
    27  // chunk splits []T into chunks of provided size.
    28  //
    29  // If the slice cannot be split evenly, the last chunk will contain all the
    30  // remaining elements. The provided size must be larger than 0.
    31  func chunk[T any](slice []T, size int) [][]T {
    32  	if size <= 0 {
    33  		panic(errors.New("size must be larger than 0"))
    34  	}
    35  	var chunks [][]T
    36  	for i := 0; i < len(slice); i += size {
    37  		end := min(i+size, len(slice))
    38  		chunks = append(chunks, slice[i:end])
    39  	}
    40  	return chunks
    41  }