readpref

package
Version: v0.1.0 Latest Latest
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Published: Dec 6, 2018 License: Apache-2.0 Imports: 5 Imported by: 0

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Index

Constants

This section is empty.

Variables

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var ErrInvalidTagSet = errors.New("an even number of tags must be specified")

ErrInvalidTagSet indicates that an invalid set of tags was specified.

Functions

This section is empty.

Types

type Mode

type Mode uint8

Mode indicates the user's preference on reads.

const (
	// PrimaryMode indicates that only a primary is
	// considered for reading. This is the default
	// mode.
	PrimaryMode Mode = iota
	// PrimaryPreferredMode indicates that if a primary
	// is available, use it; otherwise, eligible
	// secondaries will be considered.
	PrimaryPreferredMode
	// SecondaryMode indicates that only secondaries
	// should be considered.
	SecondaryMode
	// SecondaryPreferredMode indicates that only secondaries
	// should be considered when one is available. If none
	// are available, then a primary will be considered.
	SecondaryPreferredMode
	// NearestMode indicates that all primaries and secondaries
	// will be considered.
	NearestMode
)

Mode constants

func ModeFromString

func ModeFromString(mode string) (Mode, error)

ModeFromString returns a mode corresponding to mode.

type Option

type Option func(*ReadPref) error

Option configures a read preference

func WithMaxStaleness

func WithMaxStaleness(ms time.Duration) Option

WithMaxStaleness sets the maximum staleness a server is allowed.

func WithTagSets

func WithTagSets(tagSets ...tag.Set) Option

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 WithTags

func WithTags(tags ...string) Option

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.

type ReadPref

type ReadPref struct {
	// contains filtered or unexported fields
}

ReadPref determines which servers are considered suitable for read operations.

func Nearest

func Nearest(opts ...Option) *ReadPref

Nearest constructs a read preference with a NearestMode.

func New

func New(mode Mode, opts ...Option) (*ReadPref, error)

New creates a new ReadPref.

func Primary

func Primary() *ReadPref

Primary constructs a read preference with a PrimaryMode.

func PrimaryPreferred

func PrimaryPreferred(opts ...Option) *ReadPref

PrimaryPreferred constructs a read preference with a PrimaryPreferredMode.

func Secondary

func Secondary(opts ...Option) *ReadPref

Secondary constructs a read preference with a SecondaryMode.

func SecondaryPreferred

func SecondaryPreferred(opts ...Option) *ReadPref

SecondaryPreferred constructs a read preference with a SecondaryPreferredMode.

func (*ReadPref) MaxStaleness

func (r *ReadPref) MaxStaleness() (time.Duration, bool)

MaxStaleness is the maximum amount of time to allow a server to be considered eligible for selection. The second return value indicates if this value has been set.

func (*ReadPref) Mode

func (r *ReadPref) Mode() Mode

Mode indicates the mode of the read preference.

func (*ReadPref) TagSets

func (r *ReadPref) TagSets() []tag.Set

TagSets are multiple tag sets indicating which servers should be considered.

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