go mod vendor

+ move k8s.io/apimachinery fork from go.work to go.mod
(and include it in vendor)

vendor/go.mongodb.org/mongo-driver/mongo/readpref/readpref.go

@@ -0,0 +1,135 @@
+// 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 defines read preferences for MongoDB queries.
+package readpref // import "go.mongodb.org/mongo-driver/mongo/readpref"
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"time"
+
+	"go.mongodb.org/mongo-driver/tag"
+)
+
+var (
+	errInvalidReadPreference = errors.New("can not specify tags, max staleness, or hedge with mode primary")
+)
+
+var primary = ReadPref{mode: PrimaryMode}
+
+// Primary constructs a read preference with a PrimaryMode.
+func Primary() *ReadPref {
+	return &primary
+}
+
+// PrimaryPreferred constructs a read preference with a PrimaryPreferredMode.
+func PrimaryPreferred(opts ...Option) *ReadPref {
+	// New only returns an error with a mode of Primary
+	rp, _ := New(PrimaryPreferredMode, opts...)
+	return rp
+}
+
+// SecondaryPreferred constructs a read preference with a SecondaryPreferredMode.
+func SecondaryPreferred(opts ...Option) *ReadPref {
+	// New only returns an error with a mode of Primary
+	rp, _ := New(SecondaryPreferredMode, opts...)
+	return rp
+}
+
+// Secondary constructs a read preference with a SecondaryMode.
+func Secondary(opts ...Option) *ReadPref {
+	// New only returns an error with a mode of Primary
+	rp, _ := New(SecondaryMode, opts...)
+	return rp
+}
+
+// Nearest constructs a read preference with a NearestMode.
+func Nearest(opts ...Option) *ReadPref {
+	// New only returns an error with a mode of Primary
+	rp, _ := New(NearestMode, opts...)
+	return rp
+}
+
+// New creates a new ReadPref.
+func New(mode Mode, opts ...Option) (*ReadPref, error) {
+	rp := &ReadPref{
+		mode: mode,
+	}
+
+	if mode == PrimaryMode && len(opts) != 0 {
+		return nil, errInvalidReadPreference
+	}
+
+	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+		err := opt(rp)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return rp, nil
+}
+
+// ReadPref determines which servers are considered suitable for read operations.
+type ReadPref struct {
+	maxStaleness    time.Duration
+	maxStalenessSet bool
+	mode            Mode
+	tagSets         []tag.Set
+	hedgeEnabled    *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 (r *ReadPref) MaxStaleness() (time.Duration, bool) {
+	return r.maxStaleness, r.maxStalenessSet
+}
+
+// Mode indicates the mode of the read preference.
+func (r *ReadPref) Mode() Mode {
+	return r.mode
+}
+
+// TagSets are multiple tag sets indicating
+// which servers should be considered.
+func (r *ReadPref) TagSets() []tag.Set {
+	return r.tagSets
+}
+
+// HedgeEnabled returns whether or not hedged reads are enabled for this read preference. If this option was not
+// specified during read preference construction, nil is returned.
+func (r *ReadPref) HedgeEnabled() *bool {
+	return r.hedgeEnabled
+}
+
+// String returns a human-readable description of the read preference.
+func (r *ReadPref) String() string {
+	var b bytes.Buffer
+	b.WriteString(r.mode.String())
+	delim := "("
+	if r.maxStalenessSet {
+		fmt.Fprintf(&b, "%smaxStaleness=%v", delim, r.maxStaleness)
+		delim = " "
+	}
+	for _, tagSet := range r.tagSets {
+		fmt.Fprintf(&b, "%stagSet=%s", delim, tagSet.String())
+		delim = " "
+	}
+	if r.hedgeEnabled != nil {
+		fmt.Fprintf(&b, "%shedgeEnabled=%v", delim, *r.hedgeEnabled)
+		delim = " "
+	}
+	if delim != "(" {
+		b.WriteString(")")
+	}
+	return b.String()
+}