nosql

package
v0.7.2 Latest Latest
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 Go to latest Published: Mar 3, 2018 License: Apache-2.0 Imports: 18 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	Equal = FilterOp(iota + 1)
	NotEqual
	GT
	GTE
	LT
	LTE
	Regexp
)
View Source 
const (
	IndexAny    = IndexType(iota)
	StringExact // exact match for string values (usually a hash index)

)
View Source 
const DefaultDBName = "cayley"

Variables

View Source 
var (
	ErrNotFound = errors.New("not found")
)

Functions

func CompareValues 

func CompareValues(v1, v2 Value) int

CompareValues return 0 if values are equal, positive value if first value sorts after second, and negative otherwise.

func Init 

func Init(db Database, opt graph.Options) error

func Register 

func Register(name string, r Registration)

func ValuesEqual 

func ValuesEqual(v1, v2 Value) bool

ValuesEqual returns true if values are strictly equal.

Types

type BatchInserter 

type BatchInserter interface {
	BatchInsert(col string) DocWriter
}

BatchInserter is an optional interface for databases that can insert documents in batches.

type Bool 

type Bool bool

Bool is a boolean value.

type Bytes 

type Bytes []byte

Bytes is a raw binary data.

Some databases has no type to represent binary data. In this case base64 representation can be used and package will take care of converting it.

type Database 

type Database interface {
	// Insert creates a document with a given key in a given collection.
	// Key can be nil meaning that implementation should generate a unique key for the item.
	// It returns the key that was generated, or the same key that was passed to it.
	Insert(ctx context.Context, col string, key Key, d Document) (Key, error)
	// FindByKey finds a document by it's Key. It returns ErrNotFound if document not exists.
	FindByKey(ctx context.Context, col string, key Key) (Document, error)
	// Query starts construction of a new query for a specified collection.
	Query(col string) Query
	// Update starts construction of document update request for a specified document and collection.
	Update(col string, key Key) Update
	// Delete starts construction of document delete request.
	Delete(col string) Delete
	// EnsureIndex creates or updates indexes on the collection to match it's arguments.
	// It should create collection if it not exists. Primary index is guaranteed to be of StringExact type.
	EnsureIndex(ctx context.Context, col string, primary Index, secondary []Index) error
	// Close closes the database connection.
	Close() error
}

Database is a minimal interface for NoSQL database implementations.

type Delete 

type Delete interface {
	// WithFields adds specified filters to select document for deletion.
	WithFields(filters ...FieldFilter) Delete
	// Keys limits a set of documents to delete to ones with keys specified.
	// Delete still uses provided filters, thus it will not delete objects with these keys if they do not pass filters.
	Keys(keys ...Key) Delete
	// Do executes batch delete.
	Do(ctx context.Context) error
}

Update is a batch delete request builder.

type DocIterator 

type DocIterator interface {
	// Next advances an iterator to the next document.
	Next(ctx context.Context) bool
	// Err returns a last encountered error.
	Err() error
	// Close frees all resources associated with iterator.
	Close() error
	// Key returns a key of current document.
	Key() Key
	// Doc returns current document.
	Doc() Document
}

DocIterator is an iterator over a list of documents.

type DocWriter 

type DocWriter interface {
	// WriteDoc prepares document to be written. Write becomes valid only after Flush.
	WriteDoc(ctx context.Context, key Key, d Document) error
	// Flush waits for all writes to complete.
	Flush(ctx context.Context) error
	// Keys returns a list of already inserted documents.
	// Might be less then a number of written documents until Flush is called.
	Keys() []Key
	// Close closes writer and discards any unflushed documents.
	Close() error
}

DocWriter is an interface for writing documents in streaming manner.

func BatchInsert 

func BatchInsert(db Database, col string) DocWriter

BatchInsert returns a streaming writer for database or emulates it if database has no support for batch inserts.

type Document 

type Document map[string]Value

Document is a type of item stored in nosql database.

type FieldFilter 

type FieldFilter struct {
	Path   []string // path is a path to specific field in the document
	Filter FilterOp // comparison operation
	Value  Value    // value that will be compared with field of the document
}

FieldFilter represents a single field comparison operation.

func (FieldFilter) Matches 

func (f FieldFilter) Matches(d Document) bool

type FilterOp 

type FilterOp int

FilterOp is a comparison operation type used for value filters.

func (FilterOp) GoString 

func (op FilterOp) GoString() string

func (FilterOp) String 

func (op FilterOp) String() string

type Float 

type Float float64

Float is an floating point value.

Some databases might not distinguish Int value from Float. In this case the package will take care of converting it to a correct type.

type Index 

type Index struct {
	Fields []string // an ordered set of fields used in index
	Type   IndexType
}

Index is an index for a collection of documents.

type IndexType 

type IndexType int

IndexType is a type of index for collection.

type InitFunc 

type InitFunc func(string, graph.Options) (Database, error)

type Int 

type Int int64

Int is an int value.

Some databases might not distinguish Int value from Float. In this case implementation will take care of converting it to a correct type.

type Iterator 

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

func NewAllIterator 

func NewAllIterator(qs *QuadStore, collection string) *Iterator

func NewIterator 

func NewIterator(qs *QuadStore, collection string, constraints ...FieldFilter) *Iterator

func NewLinksToIterator 

func NewLinksToIterator(qs *QuadStore, collection string, links []Linkage) *Iterator

func (*Iterator) Clone 

func (it *Iterator) Clone() graph.Iterator

func (*Iterator) Close 

func (it *Iterator) Close() error

func (*Iterator) Contains 

func (it *Iterator) Contains(ctx context.Context, v graph.Value) bool

func (*Iterator) Err 

func (it *Iterator) Err() error

func (*Iterator) Next 

func (it *Iterator) Next(ctx context.Context) bool

func (*Iterator) NextPath 

func (it *Iterator) NextPath(ctx context.Context) bool

func (*Iterator) Optimize 

func (it *Iterator) Optimize() (graph.Iterator, bool)

func (*Iterator) Reset 

func (it *Iterator) Reset()

func (*Iterator) Result 

func (it *Iterator) Result() graph.Value

func (*Iterator) Size 

func (it *Iterator) Size() (int64, bool)

func (*Iterator) Sorted 

func (it *Iterator) Sorted() bool

func (*Iterator) Stats 

func (it *Iterator) Stats() graph.IteratorStats

func (*Iterator) String 

func (it *Iterator) String() string

func (*Iterator) SubIterators 

func (it *Iterator) SubIterators() []graph.Iterator

func (*Iterator) TagResults 

func (it *Iterator) TagResults(dst map[string]graph.Value)

func (*Iterator) Tagger 

func (it *Iterator) Tagger() *graph.Tagger

func (*Iterator) Type 

func (it *Iterator) Type() graph.Type

func (*Iterator) UID 

func (it *Iterator) UID() uint64

type Key 

type Key []string

Key is a set of values that describe primary key of document.

func GenKey 

func GenKey() Key

GenKey generates a unique key (with one field).

func KeyFrom 

func KeyFrom(fields []string, doc Document) Key

KeyFrom extracts a set of fields as a Key from Document.

func (Key) Value 

func (k Key) Value() Value

Value converts a Key to a value that can be stored in the database.

type Linkage 

type Linkage struct {
	Dir quad.Direction
	Val NodeHash
}

type NewFunc 

type NewFunc func(string, graph.Options) (Database, error)

type NodeHash 

type NodeHash string

func (NodeHash) IsNode 

func (NodeHash) IsNode() bool

func (NodeHash) Key 

func (v NodeHash) Key() interface{}

type Options added in v0.7.1 

type Options struct {
	Number32 bool // store is limited to 32 bit precision
}

type QuadHash 

type QuadHash [4]string

func (QuadHash) Get 

func (h QuadHash) Get(d quad.Direction) string

func (QuadHash) IsNode 

func (QuadHash) IsNode() bool

func (QuadHash) Key 

func (v QuadHash) Key() interface{}

type QuadStore 

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

func NewQuadStore added in v0.7.1 

func NewQuadStore(db Database, nopt *Options, opt graph.Options) (*QuadStore, error)

func (*QuadStore) ApplyDeltas 

func (qs *QuadStore) ApplyDeltas(deltas []graph.Delta, ignoreOpts graph.IgnoreOpts) error

func (*QuadStore) Close 

func (qs *QuadStore) Close() error

func (*QuadStore) NameOf 

func (qs *QuadStore) NameOf(v graph.Value) quad.Value

func (*QuadStore) NodesAllIterator 

func (qs *QuadStore) NodesAllIterator() graph.Iterator

func (*QuadStore) OptimizeIterator 

func (qs *QuadStore) OptimizeIterator(it graph.Iterator) (graph.Iterator, bool)

func (*QuadStore) OptimizeShape 

func (qs *QuadStore) OptimizeShape(s shape.Shape) (shape.Shape, bool)

func (*QuadStore) Quad 

func (qs *QuadStore) Quad(val graph.Value) quad.Quad

func (*QuadStore) QuadDirection 

func (qs *QuadStore) QuadDirection(in graph.Value, d quad.Direction) graph.Value

func (*QuadStore) QuadIterator 

func (qs *QuadStore) QuadIterator(d quad.Direction, val graph.Value) graph.Iterator

func (*QuadStore) QuadsAllIterator 

func (qs *QuadStore) QuadsAllIterator() graph.Iterator

func (*QuadStore) Size 

func (qs *QuadStore) Size() int64

func (*QuadStore) ValueOf 

func (qs *QuadStore) ValueOf(s quad.Value) graph.Value

type Quads 

type Quads struct {
	Links []Linkage // filters to select quads
	Limit int64     // limits a number of documents
}

Quads is a shape representing a quads query

func (Quads) BuildIterator 

func (s Quads) BuildIterator(qs graph.QuadStore) graph.Iterator

func (Quads) Optimize 

func (s Quads) Optimize(r shape.Optimizer) (shape.Shape, bool)

type Query 

type Query interface {
	// WithFields adds specified filters to the query.
	WithFields(filters ...FieldFilter) Query
	// Limit limits a maximal number of results returned.
	Limit(n int) Query

	// Count executes query and returns a number of items that matches it.
	Count(ctx context.Context) (int64, error)
	// One executes query and returns first document from it.
	One(ctx context.Context) (Document, error)
	// Iterate starts an iteration over query results.
	Iterate() DocIterator
}

Query is a query builder object.

type Registration 

type Registration struct {
	NewFunc      NewFunc
	InitFunc     InitFunc
	IsPersistent bool
	Options
}

type Shape 

type Shape struct {
	Collection string        // name of the collection
	Filters    []FieldFilter // filters to select documents
	Limit      int64         // limits a number of documents
}

Shape is a shape representing a documents query with filters

func (Shape) BuildIterator 

func (s Shape) BuildIterator(qs graph.QuadStore) graph.Iterator

func (Shape) Optimize 

func (s Shape) Optimize(r shape.Optimizer) (shape.Shape, bool)

type String 

type String string

String is an UTF8 string value.

type Strings 

type Strings []string

Strings is an array of strings. Used mostly to store Keys.

type Time 

type Time time.Time

Time is a timestamp value.

Some databases has no type to represent time values. In this case string/json representation can be used and package will take care of converting it.

type Update 

type Update interface {
	// Inc increments document field with a given amount. Will also increment upserted document.
	Inc(field string, dn int) Update
	// Upsert sets a document that will be inserted in case original object does not exists already.
	// It should omit fields used by Inc - they will be added automatically.
	Upsert(d Document) Update
	// Do executes update request.
	Do(ctx context.Context) error
}

Update is an update request builder.

type Value 

type Value interface {
	// contains filtered or unexported methods
}

Value is a interface that limits a set of types that nosql database can handle.

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