ModeFromString returns a mode corresponding to mode.

Nearest constructs a read preference with a NearestMode.

New creates a new ReadPref.

Primary constructs a read preference with a PrimaryMode.

PrimaryPreferred constructs a read preference with a PrimaryPreferredMode.

Secondary constructs a read preference with a SecondaryMode.

SecondaryPreferred constructs a read preference with a SecondaryPreferredMode.

WithMaxStaleness sets the maximum staleness a server is allowed.

WithTags sets a single tag set used to match a server.

WithTagSets sets the tag sets used to match a server.

NearestMode indicates that all primaries and secondaries will be considered.

PrimaryMode indicates that only a primary is considered for reading.

PrimaryPreferredMode indicates that if a primary is available, use it; otherwise, eligible secondaries will be considered.

SecondaryMode indicates that only secondaries should be considered.

SecondaryPreferredMode indicates that only secondaries should be considered when one is available.

ErrInvalidTagSet indicates that an invalid set of tags was specified.

ReadPref determines which servers are considered suitable for read operations.

Mode indicates the user's preference on reads.

Option configures a read preference.