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72 lines
2.1 KiB
72 lines
2.1 KiB
3 years ago
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package readpref
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import (
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"errors"
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"time"
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"go.mongodb.org/mongo-driver/tag"
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)
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// ErrInvalidTagSet indicates that an invalid set of tags was specified.
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var ErrInvalidTagSet = errors.New("an even number of tags must be specified")
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// Option configures a read preference
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type Option func(*ReadPref) error
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// WithMaxStaleness sets the maximum staleness a
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// server is allowed.
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func WithMaxStaleness(ms time.Duration) Option {
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return func(rp *ReadPref) error {
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rp.maxStaleness = ms
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rp.maxStalenessSet = true
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return nil
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}
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}
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// WithTags sets a single tag set used to match
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// a server. The last call to WithTags or WithTagSets
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// overrides all previous calls to either method.
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func WithTags(tags ...string) Option {
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return func(rp *ReadPref) error {
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length := len(tags)
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if length < 2 || length%2 != 0 {
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return ErrInvalidTagSet
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}
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tagset := make(tag.Set, 0, length/2)
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for i := 1; i < length; i += 2 {
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tagset = append(tagset, tag.Tag{Name: tags[i-1], Value: tags[i]})
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}
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return WithTagSets(tagset)(rp)
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}
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}
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// WithTagSets sets the tag sets used to match
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// a server. The last call to WithTags or WithTagSets
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// overrides all previous calls to either method.
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func WithTagSets(tagSets ...tag.Set) Option {
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return func(rp *ReadPref) error {
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rp.tagSets = tagSets
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return nil
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}
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}
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// WithHedgeEnabled specifies whether or not hedged reads should be enabled in the server. This feature requires MongoDB
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// server version 4.4 or higher. For more information about hedged reads, see
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// https://docs.mongodb.com/manual/core/sharded-cluster-query-router/#mongos-hedged-reads. If not specified, the default
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// is to not send a value to the server, which will result in the server defaults being used.
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func WithHedgeEnabled(hedgeEnabled bool) Option {
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return func(rp *ReadPref) error {
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rp.hedgeEnabled = &hedgeEnabled
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return nil
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}
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}
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