ds

package
v0.1.0 Latest Latest
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 Go to latest Published: Oct 13, 2019 License: Apache-2.0 Imports: 11 Imported by: 14

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrNoSuchEntity      = errors.New("dsprovider: no such entity")
	ErrFieldMismatch     = errors.New("dsprovider: src obj had a field that dst obj didn't")
	ErrNoMemcacheService = errors.New("dsprovider: no memcache service available")
)
View Source 
var Debug = false

Functions

func SetProvider 

func SetProvider(ctx context.Context, p DatastoreProvider) context.Context

SetProvider embeds a provider inside a Context, for later retrieval

Types

type CloudDSProvider 

type CloudDSProvider struct {
	Project string
	// contains filtered or unexported fields
}

CloudDSProvider implements the DatastoreProvider interface using the cloud datastore API, for use outside of appengine environments.

func NewCloudDSProvider 

func NewCloudDSProvider(ctx context.Context, project string) (*CloudDSProvider, error)

func (CloudDSProvider) Criticalf 

func (p CloudDSProvider) Criticalf(ctx context.Context, format string, args ...interface{})

func (CloudDSProvider) Debugf 

func (p CloudDSProvider) Debugf(ctx context.Context, format string, args ...interface{})

func (CloudDSProvider) DecodeKey 

func (p CloudDSProvider) DecodeKey(encoded string) (Keyer, error)

func (CloudDSProvider) Delete 

func (p CloudDSProvider) Delete(ctx context.Context, keyer Keyer) error

func (CloudDSProvider) DeleteMulti 

func (p CloudDSProvider) DeleteMulti(ctx context.Context, keyers []Keyer) error

func (CloudDSProvider) Errorf 

func (p CloudDSProvider) Errorf(ctx context.Context, format string, args ...interface{})

func (CloudDSProvider) Get 

func (p CloudDSProvider) Get(ctx context.Context, keyer Keyer, dst interface{}) error

func (CloudDSProvider) GetAll 

func (p CloudDSProvider) GetAll(ctx context.Context, q *Query, dst interface{}) ([]Keyer, error)

func (CloudDSProvider) GetMulti 

func (p CloudDSProvider) GetMulti(ctx context.Context, keyers []Keyer, dst interface{}) error

func (CloudDSProvider) HTTPClient 

func (p CloudDSProvider) HTTPClient(ctx context.Context) *http.Client

func (CloudDSProvider) Infof 

func (p CloudDSProvider) Infof(ctx context.Context, format string, args ...interface{})

func (CloudDSProvider) KeyName 

func (p CloudDSProvider) KeyName(in Keyer) string

func (CloudDSProvider) KeyParent 

func (p CloudDSProvider) KeyParent(in Keyer) Keyer

func (CloudDSProvider) NewIDKey 

func (p CloudDSProvider) NewIDKey(ctx context.Context, kind string, id int64, root Keyer) Keyer

func (CloudDSProvider) NewIncompleteKey 

func (p CloudDSProvider) NewIncompleteKey(ctx context.Context, kind string, root Keyer) Keyer

func (CloudDSProvider) NewNameKey 

func (p CloudDSProvider) NewNameKey(ctx context.Context, kind, name string, root Keyer) Keyer

func (CloudDSProvider) Put 

func (p CloudDSProvider) Put(ctx context.Context, keyer Keyer, src interface{}) (Keyer, error)

func (CloudDSProvider) PutMulti 

func (p CloudDSProvider) PutMulti(ctx context.Context, keyers []Keyer, src interface{}) ([]Keyer, error)

func (CloudDSProvider) Warningf 

func (p CloudDSProvider) Warningf(ctx context.Context, format string, args ...interface{})

type DatastoreProvider 

type DatastoreProvider interface {
	Get(ctx context.Context, keyer Keyer, dst interface{}) error
	GetMulti(ctx context.Context, keyers []Keyer, dst interface{}) error
	GetAll(ctx context.Context, q *Query, dst interface{}) ([]Keyer, error)
	Put(ctx context.Context, keyer Keyer, src interface{}) (Keyer, error)
	PutMulti(ctx context.Context, keyers []Keyer, src interface{}) ([]Keyer, error)
	Delete(ctx context.Context, keyer Keyer) error
	DeleteMulti(ctx context.Context, keyers []Keyer) error

	NewIncompleteKey(ctx context.Context, kind string, root Keyer) Keyer
	NewNameKey(ctx context.Context, kind, name string, root Keyer) Keyer
	NewIDKey(ctx context.Context, kind string, id int64, root Keyer) Keyer
	DecodeKey(encoded string) (Keyer, error)
	KeyParent(Keyer) Keyer
	KeyName(Keyer) string

	// HTTP client - maybe urlfetch, maybe not
	HTTPClient(ctx context.Context) *http.Client

	// Logging support - goes to appengine logging, or maybe STDOUT
	Debugf(ctx context.Context, format string, args ...interface{})
	Infof(ctx context.Context, format string, args ...interface{})
	Warningf(ctx context.Context, format string, args ...interface{})
	Errorf(ctx context.Context, format string, args ...interface{})
	Criticalf(ctx context.Context, format string, args ...interface{})
}

Provider is a wrapper over the datastore APIs (cloud and appengine), so that client code (and in particular query assembley) can run both inside and outside of google appengine.

In fact, it wraps all the appengine APIs (incl. /log and /urlfetch), so we don't need to worry about any appengine libs except in util/ae/ds.

func GetProviderOrPanic 

func GetProviderOrPanic(ctx context.Context) DatastoreProvider

GetProvider retrieves the provider from the context; panics if not found

type Filter 

type Filter struct {
	Field string
	Value interface{}
}

type Iterator 

type Iterator struct {
	PageSize int

	Slice interface{} // The current page of results
	// contains filtered or unexported fields
}

Iterator is a batching iterator that executes the full query up front, to get a list of all keys; then it fetches pages of results as it works through the keys. We don't use datastore.Iterator, as it times out the result set after 60 seconds, out of abundance of caution.

func NewIterator 

func NewIterator(ctx context.Context, p DatastoreProvider, q *Query, obj interface{}) *Iterator

Snarf down all the keys from the get go.

func (*Iterator) Err 

func (iter *Iterator) Err() error

func (*Iterator) Iterate 

func (iter *Iterator) Iterate(ctx context.Context) bool

func (*Iterator) Remaining 

func (iter *Iterator) Remaining() int

Remaining returns how many items are yet to be processed by the caller

func (*Iterator) SetErr 

func (iter *Iterator) SetErr(err error)

Convenience function for things that wrap iterator

func (*Iterator) Val 

func (iter *Iterator) Val(dst interface{}) Keyer

func (*Iterator) ValAsInterface 

func (iter *Iterator) ValAsInterface() interface{}

ValAsInterface returns the val as the base interface; it will need a type assertion back into the relevant type.

type Keyer 

type Keyer interface {
	Encode() string
}

Keyer is a very thin wrapper. It should be populated with a *datastore.Key

type Query 

type Query struct {
	Kind          string
	AncestorKeyer Keyer
	Filters       []Filter
	ProjectFields []string
	OrderStr      string
	LimitVal      int
	KeysOnlyVal   bool
	DistinctVals  bool
}

Query is a thin skin over the datastore query API. It also provides a textual dump of the query.

func NewQuery 

func NewQuery(kind string) *Query

func (*Query) Ancestor 

func (q *Query) Ancestor(keyer Keyer) *Query

func (*Query) Distinct 

func (q *Query) Distinct() *Query

func (*Query) Filter 

func (q *Query) Filter(field string, val interface{}) *Query

func (*Query) KeysOnly 

func (q *Query) KeysOnly() *Query

func (*Query) Limit 

func (q *Query) Limit(l int) *Query

func (*Query) Order 

func (q *Query) Order(o string) *Query

func (*Query) Project 

func (q *Query) Project(fields ...string) *Query

func (*Query) String 

func (q *Query) String() string

Source Files

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