micro/store/options.go

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package store
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import (
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"context"
"time"
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)
// Options contains configuration for the Store
type Options struct {
// Nodes contains the addresses or other connection information of the backing storage.
// For example, an etcd implementation would contain the nodes of the cluster.
// A SQL implementation could contain one or more connection strings.
Nodes []string
// Database allows multiple isolated stores to be kept in one backend, if supported.
Database string
// Table is analagous to a table in database backends or a key prefix in KV backends
Table string
// Context should contain all implementation specific options, using context.WithValue.
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Context context.Context
}
// Option sets values in Options
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type Option func(o *Options)
// Nodes contains the addresses or other connection information of the backing storage.
// For example, an etcd implementation would contain the nodes of the cluster.
// A SQL implementation could contain one or more connection strings.
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func Nodes(a ...string) Option {
return func(o *Options) {
o.Nodes = a
}
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}
// Database allows multiple isolated stores to be kept in one backend, if supported.
func Database(db string) Option {
return func(o *Options) {
o.Database = db
}
}
// Table is analagous to a table in database backends or a key prefix in KV backends
func Table(t string) Option {
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return func(o *Options) {
o.Table = t
}
}
// WithContext sets the stores context, for any extra configuration
func WithContext(c context.Context) Option {
return func(o *Options) {
o.Context = c
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}
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}
// ReadOptions configures an individual Read operation
type ReadOptions struct {
// Prefix returns all records that are prefixed with key
Prefix bool
// Suffix returns all records that have the suffix key
Suffix bool
// Limit limits the number of returned records
Limit uint
// Offset when combined with Limit supports pagination
Offset uint
}
// ReadOption sets values in ReadOptions
type ReadOption func(r *ReadOptions)
// ReadPrefix returns all records that are prefixed with key
func ReadPrefix() ReadOption {
return func(r *ReadOptions) {
r.Prefix = true
}
}
// ReadSuffix returns all records that have the suffix key
func ReadSuffix() ReadOption {
return func(r *ReadOptions) {
r.Suffix = true
}
}
// ReadLimit limits the number of responses to l
func ReadLimit(l uint) ReadOption {
return func(r *ReadOptions) {
r.Limit = l
}
}
// ReadOffset starts returning responses from o. Use in conjunction with Limit for pagination
func ReadOffset(o uint) ReadOption {
return func(r *ReadOptions) {
r.Offset = o
}
}
// WriteOptions configures an individual Write operation
// If Expiry and TTL are set TTL takes precedence
type WriteOptions struct {
// Expiry is the time the record expires
Expiry time.Time
// TTL is the time until the record expires
TTL time.Duration
}
// WriteOption sets values in WriteOptions
type WriteOption func(w *WriteOptions)
// WriteExpiry is the time the record expires
func WriteExpiry(t time.Time) WriteOption {
return func(w *WriteOptions) {
w.Expiry = t
}
}
// WriteTTL is the time the record expires
func WriteTTL(d time.Duration) WriteOption {
return func(w *WriteOptions) {
w.TTL = d
}
}
// DeleteOptions configures an individual Delete operation
type DeleteOptions struct{}
// DeleteOption sets values in DeleteOptions
type DeleteOption func(d *DeleteOptions)
// ListOptions configures an individual List operation
type ListOptions struct {
// Prefix returns all keys that are prefixed with key
Prefix string
// Suffix returns all keys that end with key
Suffix string
// Limit limits the number of returned keys
Limit uint
// Offset when combined with Limit supports pagination
Offset uint
}
// ListOption sets values in ListOptions
type ListOption func(l *ListOptions)
// ListPrefix returns all keys that are prefixed with key
func ListPrefix(p string) ListOption {
return func(l *ListOptions) {
l.Prefix = p
}
}
// ListSuffix returns all keys that end with key
func ListSuffix(s string) ListOption {
return func(l *ListOptions) {
l.Suffix = s
}
}
// ListLimit limits the number of returned keys to l
func ListLimit(l uint) ListOption {
return func(lo *ListOptions) {
lo.Limit = l
}
}
// ListOffset starts returning responses from o. Use in conjunction with Limit for pagination.
func ListOffset(o uint) ListOption {
return func(l *ListOptions) {
l.Offset = o
}
}