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// 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
}
}
// WithHedgeEnabled specifies whether or not hedged reads should be enabled in the server. This feature requires MongoDB
// server version 4.4 or higher. For more information about hedged reads, see
// https://docs.mongodb.com/manual/core/sharded-cluster-query-router/#mongos-hedged-reads. If not specified, the default
// is to not send a value to the server, which will result in the server defaults being used.
func WithHedgeEnabled(hedgeEnabled bool) Option {
return func(rp *ReadPref) error {
rp.hedgeEnabled = &hedgeEnabled
return nil
}
}
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