61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
|
// Copyright (C) MongoDB, Inc. 2017-present.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may
|
||
|
|
// not use this file except in compliance with the License. You may obtain
|
||
|
|
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
package readpref
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"go.mongodb.org/mongo-driver/tag"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ErrInvalidTagSet indicates that an invalid set of tags was specified.
|
||
|
|
var ErrInvalidTagSet = errors.New("an even number of tags must be specified")
|
||
|
|
|
||
|
|
// Option configures a read preference
|
||
|
|
type Option func(*ReadPref) error
|
||
|
|
|
||
|
|
// WithMaxStaleness sets the maximum staleness a
|
||
|
|
// server is allowed.
|
||
|
|
func WithMaxStaleness(ms time.Duration) Option {
|
||
|
|
return func(rp *ReadPref) error {
|
||
|
|
rp.maxStaleness = ms
|
||
|
|
rp.maxStalenessSet = true
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// WithTags sets a single tag set used to match
|
||
|
|
// a server. The last call to WithTags or WithTagSets
|
||
|
|
// overrides all previous calls to either method.
|
||
|
|
func WithTags(tags ...string) Option {
|
||
|
|
return func(rp *ReadPref) error {
|
||
|
|
length := len(tags)
|
||
|
|
if length < 2 || length%2 != 0 {
|
||
|
|
return ErrInvalidTagSet
|
||
|
|
}
|
||
|
|
|
||
|
|
tagset := make(tag.Set, 0, length/2)
|
||
|
|
|
||
|
|
for i := 1; i < length; i += 2 {
|
||
|
|
tagset = append(tagset, tag.Tag{Name: tags[i-1], Value: tags[i]})
|
||
|
|
}
|
||
|
|
|
||
|
|
return WithTagSets(tagset)(rp)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// WithTagSets sets the tag sets used to match
|
||
|
|
// a server. The last call to WithTags or WithTagSets
|
||
|
|
// overrides all previous calls to either method.
|
||
|
|
func WithTagSets(tagSets ...tag.Set) Option {
|
||
|
|
return func(rp *ReadPref) error {
|
||
|
|
rp.tagSets = tagSets
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|