kv

package
v0.69.1 Latest Latest
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 Go to latest Published: Jul 14, 2022 License: Apache-2.0 Imports: 19 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	InitialMigrateVersion = 1
	PathDelimiter         = "/"
	DBSchemaVersionKey    = "kv" + PathDelimiter + "schema" + PathDelimiter + "version"
	MetadataPartitionKey  = "kv-internal-metadata"
)

Variables

View Source 
var (
	ErrClosedEntries       = errors.New("closed entries")
	ErrConnectFailed       = errors.New("connect failed")
	ErrDriverConfiguration = errors.New("driver configuration")
	ErrMissingPartitionKey = errors.New("missing partition key")
	ErrMissingKey          = errors.New("missing key")
	ErrMissingValue        = errors.New("missing value")
	ErrNotFound            = errors.New("not found")
	ErrOperationFailed     = errors.New("operation failed")
	ErrPredicateFailed     = errors.New("predicate failed")
	ErrSetupFailed         = errors.New("setup failed")
	ErrUnknownDriver       = errors.New("unknown driver")
	ErrTableNotActive      = errors.New("table not active")
)
View Source 
var ErrInvalidFormat = errors.New("invalid format")
View Source 
var File_secondary_index_proto protoreflect.FileDescriptor

Functions

func Drivers 

func Drivers() []string

Drivers returns a list of registered drive names

func FormatPath added in v0.65.0 

func FormatPath(p ...string) string

func GetDBSchemaVersion added in v0.66.0 

func GetDBSchemaVersion(ctx context.Context, store Store) (int, error)

GetDBSchemaVersion returns the current KV DB schema version

func Import added in v0.66.0 

func Import(ctx context.Context, reader io.Reader, store Store) error

func Register 

func Register(name string, driver Driver)

Register 'driver' implementation under 'name'. Panic in case of empty name, nil driver or name already registered.

func UnregisterAllDrivers 

func UnregisterAllDrivers()

UnregisterAllDrivers remove all loaded drivers, used for test code.

Types

type Driver 

type Driver interface {
	// Open opens access to the database store. Implementations give access to the same storage based on the dsn.
	// Implementation can return the same Storage instance based on dsn or new one as long as it provides access to
	// the same storage.
	Open(ctx context.Context, params kvparams.KV) (Store, error)
}

Driver is the interface to access a kv database as a Store. Each kv provider implements a Driver.

type EntriesIterator 

type EntriesIterator interface {
	// Next should be called first before access Entry.
	// it will process the next entry and return true if it was successful, and false when none or error.
	Next() bool

	// Entry current entry read after calling Next, set to nil in case of an error or no more entries.
	Entry() *Entry

	// Err set to last error by reading or parse the next entry.
	Err() error

	// Close should be called at the end of processing entries, required to release resources used to scan entries.
	// After calling 'Close' the instance should not be used as the behaviour will not be defined.
	Close()
}

EntriesIterator used to enumerate over Scan results

func NewSkipIterator added in v0.68.0 

func NewSkipIterator(it EntriesIterator, after []byte) EntriesIterator

func ScanPrefix 

func ScanPrefix(ctx context.Context, store Store, partitionKey, prefix, after []byte) (EntriesIterator, error)

ScanPrefix returns an iterator on store that scan the set of keys that start with prefix after is the full key name for which to start the scan from

type Entry 

type Entry struct {
	PartitionKey []byte
	Key          []byte
	Value        []byte
}

Entry holds a pair of key/value

func (*Entry) String 

func (e *Entry) String() string
type Header struct {
	LakeFSVersion   string
	PackageName     string
	DBSchemaVersion int
	CreatedAt       time.Time
}

Header contains metadata information for import / export file

type IteratorOptions added in v0.69.1 

type IteratorOptions interface {
	// Start returns the starting point of the iterator
	Start() []byte

	// IncludeStart determines whether to include Start() value in the iterator
	IncludeStart() bool
}

IteratorOptions are the starting point options for PrimaryIterator

func IteratorOptionsAfter added in v0.69.1 

func IteratorOptionsAfter(start []byte) IteratorOptions

IteratorOptionsAfter - returns iterator options from that exclude the start key.

func IteratorOptionsFrom added in v0.69.1 

func IteratorOptionsFrom(start []byte) IteratorOptions

IteratorOptionsFrom - returns iterator options from that includes the start key, if exists.

type MessageEntry added in v0.66.0 

type MessageEntry struct {
	Key   []byte
	Value protoreflect.ProtoMessage
}

type MessageIterator added in v0.66.0 

type MessageIterator interface {
	Next() bool
	Entry() *MessageEntry
	Err() error
	Close()
}

type PartitionIterator added in v0.69.0 

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

PartitionIterator Used to scan through a whole partition

func NewPartitionIterator added in v0.69.0 

func NewPartitionIterator(ctx context.Context, store Store, msgType protoreflect.MessageType, partitionKey string) (*PartitionIterator, error)

func (*PartitionIterator) Close added in v0.69.0 

func (p *PartitionIterator) Close()

func (*PartitionIterator) Entry added in v0.69.0 

func (p *PartitionIterator) Entry() *MessageEntry

func (*PartitionIterator) Err added in v0.69.0 

func (p *PartitionIterator) Err() error

func (*PartitionIterator) Next added in v0.69.0 

func (p *PartitionIterator) Next() bool

func (*PartitionIterator) SeekGE added in v0.69.0 

func (p *PartitionIterator) SeekGE(key []byte)

type Predicate added in v0.66.0 

type Predicate interface{}

Predicate value used to update a key base on a previous fetched value. 

Store's Get used to pull the key's value with the associated predicate.
Store's SetIf used to set the key's value based on the predicate.

type PrefixIterator 

type PrefixIterator struct {
	Iterator     EntriesIterator
	Prefix       []byte
	PartitionKey []byte
	// contains filtered or unexported fields
}

func (*PrefixIterator) Close 

func (b *PrefixIterator) Close()

func (*PrefixIterator) Entry 

func (b *PrefixIterator) Entry() *Entry

func (*PrefixIterator) Err 

func (b *PrefixIterator) Err() error

func (*PrefixIterator) Next 

func (b *PrefixIterator) Next() bool

type PrimaryIterator added in v0.67.0 

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

PrimaryIterator MessageIterator implementation for primary key The iterator iterates over the given prefix and returns the proto message and key

func NewPrimaryIterator added in v0.67.0 

func NewPrimaryIterator(ctx context.Context, store Store, msgType protoreflect.MessageType, partitionKey string, prefix []byte, options IteratorOptions) (*PrimaryIterator, error)

NewPrimaryIterator creates a new PrimaryIterator by scanning the store for the given prefix under the partitionKey. See IteratorOptions for the starting point options.

func (*PrimaryIterator) Close added in v0.67.0 

func (i *PrimaryIterator) Close()

func (*PrimaryIterator) Entry added in v0.67.0 

func (i *PrimaryIterator) Entry() *MessageEntry

func (*PrimaryIterator) Err added in v0.67.0 

func (i *PrimaryIterator) Err() error

func (*PrimaryIterator) Next added in v0.67.0 

func (i *PrimaryIterator) Next() bool

type SafeEncoder added in v0.67.0 

type SafeEncoder struct {
	Je *json.Encoder
	Mu sync.Mutex
}

func (*SafeEncoder) Encode added in v0.67.0 

func (e *SafeEncoder) Encode(v interface{}) error

type SecondaryIndex added in v0.67.0 

type SecondaryIndex struct {
	PrimaryKey []byte `protobuf:"bytes,1,opt,name=primary_key,json=primaryKey,proto3" json:"primary_key,omitempty"`
	// contains filtered or unexported fields
}

message data model for secondary index

func (*SecondaryIndex) Descriptor deprecated added in v0.67.0 

func (*SecondaryIndex) Descriptor() ([]byte, []int)

Deprecated: Use SecondaryIndex.ProtoReflect.Descriptor instead.

func (*SecondaryIndex) GetPrimaryKey added in v0.67.0 

func (x *SecondaryIndex) GetPrimaryKey() []byte

func (*SecondaryIndex) ProtoMessage added in v0.67.0 

func (*SecondaryIndex) ProtoMessage()

func (*SecondaryIndex) ProtoReflect added in v0.67.0 

func (x *SecondaryIndex) ProtoReflect() protoreflect.Message

func (*SecondaryIndex) Reset added in v0.67.0 

func (x *SecondaryIndex) Reset()

func (*SecondaryIndex) String added in v0.67.0 

func (x *SecondaryIndex) String() string

type SecondaryIterator added in v0.67.0 

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

SecondaryIterator MessageIterator implementation for secondary key The iterator iterates over the given prefix, extracts the primary key value from secondary key and then returns the proto message and primary key

func NewSecondaryIterator added in v0.67.0 

func NewSecondaryIterator(ctx context.Context, store Store, msgType protoreflect.MessageType, partitionKey string, prefix, after []byte) (*SecondaryIterator, error)

func (*SecondaryIterator) Close added in v0.67.0 

func (s *SecondaryIterator) Close()

func (*SecondaryIterator) Entry added in v0.67.0 

func (s *SecondaryIterator) Entry() *MessageEntry

func (*SecondaryIterator) Err added in v0.67.0 

func (s *SecondaryIterator) Err() error

func (*SecondaryIterator) Next added in v0.67.0 

func (s *SecondaryIterator) Next() bool

type SkipFirstIterator added in v0.68.0 

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

SkipFirstIterator will keep the behaviour of the given EntriesIterator, except for skipping the first Entry if its Key is equal to 'after'.

func (*SkipFirstIterator) Close added in v0.68.0 

func (si *SkipFirstIterator) Close()

func (*SkipFirstIterator) Entry added in v0.68.0 

func (si *SkipFirstIterator) Entry() *Entry

func (*SkipFirstIterator) Err added in v0.68.0 

func (si *SkipFirstIterator) Err() error

func (*SkipFirstIterator) Next added in v0.68.0 

func (si *SkipFirstIterator) Next() bool

type Store 

type Store interface {
	// Get returns a result containing the Value and Predicate for the given key, or ErrNotFound if key doesn't exist
	//   Predicate can be used for SetIf operation
	Get(ctx context.Context, partitionKey, key []byte) (*ValueWithPredicate, error)

	// Set stores the given value, overwriting an existing value if one exists
	Set(ctx context.Context, partitionKey, key, value []byte) error

	// SetIf returns an ErrPredicateFailed error if the key with valuePredicate passed
	//  doesn't match the currently stored value. SetIf is a simple compare-and-swap operator:
	//  valuePredicate is either the existing value, or nil for no previous key exists.
	//  this is intentionally simplistic: we can model a better abstraction on top, keeping this interface simple for implementors
	SetIf(ctx context.Context, partitionKey, key, value []byte, valuePredicate Predicate) error

	// Delete will delete the key, no error in if key doesn't exist
	Delete(ctx context.Context, partitionKey, key []byte) error

	// Scan returns entries that can be read by key order, starting at or after the `start` position
	// partitionKey is optional, passing it might increase performance.
	Scan(ctx context.Context, partitionKey, start []byte) (EntriesIterator, error)

	// Close access to the database store. After calling Close the instance is unusable.
	Close()
}

func Open 

func Open(ctx context.Context, name string, params kvparams.KV) (Store, error)

Open lookup driver with 'name' and return Store based on 'dsn' (data source name). Failed with ErrUnknownDriver in case 'name' is not registered

type StoreMessage added in v0.65.0 

type StoreMessage struct {
	Store
}

StoreMessage protobuf generic implementation for kv.Store interface applicable for all data models

func (*StoreMessage) DeleteMsg added in v0.66.0 

func (s *StoreMessage) DeleteMsg(ctx context.Context, partitionKey string, key []byte) error

func (*StoreMessage) GetMsg added in v0.65.0 

func (s *StoreMessage) GetMsg(ctx context.Context, partitionKey string, key []byte, msg protoreflect.ProtoMessage) (Predicate, error)

GetMsg based on 'path' the value will be loaded into 'msg' and return a predicate. 

In case 'msg' is nil, a predicate will be returned

func (*StoreMessage) Scan added in v0.66.0 

func (s *StoreMessage) Scan(ctx context.Context, msgType protoreflect.MessageType, partitionKey string, prefix, after []byte) (*PrimaryIterator, error)

func (*StoreMessage) SetMsg added in v0.65.0 

func (s *StoreMessage) SetMsg(ctx context.Context, partitionKey string, key []byte, msg protoreflect.ProtoMessage) error

func (*StoreMessage) SetMsgIf added in v0.66.0 

func (s *StoreMessage) SetMsgIf(ctx context.Context, partitionKey string, key []byte, msg protoreflect.ProtoMessage, predicate Predicate) error

type ValueWithPredicate added in v0.66.0 

type ValueWithPredicate struct {
	Value     []byte
	Predicate Predicate
}

ValueWithPredicate value with predicate - Value holds the data and Predicate a value used for conditional set. 

Get operation will return this struct, holding the key's information
SetIf operation will use the Predicate for conditional set

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