kvproto

Documentation

Overview

Package kvproto provides a wrapper that simplifies the storing and retrieving of proto-modelled data into/from a key-value data store.

Index

• func NewWatchResp(serializer keyval.Serializer, resp keyval.BytesWatchResp) datasync.ProtoWatchResp
• type ProtoWrapper
  • func NewProtoWrapper(db keyval.CoreBrokerWatcher, serializer ...keyval.Serializer) *ProtoWrapper
  • func NewProtoWrapperWithSerializer(db keyval.CoreBrokerWatcher, serializer keyval.Serializer) *ProtoWrapper
  • func (db *ProtoWrapper) Close() error
  • func (db *ProtoWrapper) Delete(key string, opts ...datasync.DelOption) (existed bool, err error)
  • func (db *ProtoWrapper) GetValue(key string, reqObj proto.Message) (found bool, revision int64, err error)
  • func (db *ProtoWrapper) ListKeys(prefix string) (keyval.ProtoKeyIterator, error)
  • func (db *ProtoWrapper) ListValues(key string) (keyval.ProtoKeyValIterator, error)
  • func (db *ProtoWrapper) NewBroker(prefix string) keyval.ProtoBroker
  • func (db *ProtoWrapper) NewTxn() keyval.ProtoTxn
  • func (db *ProtoWrapper) NewWatcher(prefix string) keyval.ProtoWatcher
  • func (db *ProtoWrapper) Put(key string, value proto.Message, opts ...datasync.PutOption) error
  • func (db *ProtoWrapper) Watch(resp func(datasync.ProtoWatchResp), closeChan chan string, keys ...string) error

Functions

func NewWatchResp

func NewWatchResp(serializer keyval.Serializer, resp keyval.BytesWatchResp) datasync.ProtoWatchResp

NewWatchResp initializes proto watch response from raw WatchResponse <resp>.

Types

type ProtoWrapper

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

ProtoWrapper is a decorator which allows to read/write proto file modelled data. It marshals/unmarshals go structures to slice of bytes and vice versa behind the scenes.

func NewProtoWrapper

func NewProtoWrapper(db keyval.CoreBrokerWatcher, serializer ...keyval.Serializer) *ProtoWrapper

NewProtoWrapper initializes proto decorator. The default serializer is used - SerializerProto.

func NewProtoWrapperWithSerializer

func NewProtoWrapperWithSerializer(db keyval.CoreBrokerWatcher, serializer keyval.Serializer) *ProtoWrapper

NewProtoWrapperWithSerializer initializes proto decorator with the specified serializer.

func (*ProtoWrapper) Close

func (db *ProtoWrapper) Close() error

Close closes underlying connection to ETCD. Beware: if the connection is shared among multiple instances, this might unintentionally cancel the connection for them.

func (*ProtoWrapper) Delete

func (db *ProtoWrapper) Delete(key string, opts ...datasync.DelOption) (existed bool, err error)

Delete removes key-value items stored under <key> from datastore.

func (*ProtoWrapper) GetValue

func (db *ProtoWrapper) GetValue(key string, reqObj proto.Message) (found bool, revision int64, err error)

GetValue retrieves one key-value item from the datastore. The item is identified by the provided <key>.

If the item was found, its value is unmarshaled and placed in the <reqObj> message buffer and the function returns <found> as *true*. If the object was not found, the function returns <found> as *false*. Function also returns the revision of the latest modification. Any encountered error is returned in <err>.

func (*ProtoWrapper) ListKeys

func (db *ProtoWrapper) ListKeys(prefix string) (keyval.ProtoKeyIterator, error)

ListKeys returns an iterator that allows to traverse all keys that share the given <prefix> from data store.

func (*ProtoWrapper) ListValues

func (db *ProtoWrapper) ListValues(key string) (keyval.ProtoKeyValIterator, error)

ListValues retrieves an iterator for elements stored under the provided <key>.

func (*ProtoWrapper) NewBroker

func (db *ProtoWrapper) NewBroker(prefix string) keyval.ProtoBroker

NewBroker creates a new instance of the proxy that shares the underlying connection and allows to read/edit key-value pairs.

func (*ProtoWrapper) NewTxn

func (db *ProtoWrapper) NewTxn() keyval.ProtoTxn

NewTxn creates a new Data Broker transaction. A transaction can hold multiple operations that are all committed to the data store together. After a transaction has been created, one or more operations (put or delete) can be added to the transaction before it is committed.

func (*ProtoWrapper) NewWatcher

func (db *ProtoWrapper) NewWatcher(prefix string) keyval.ProtoWatcher

NewWatcher creates a new instance of the proxy that shares the underlying connection and allows subscribing for watching of the changes.

func (*ProtoWrapper) Put

func (db *ProtoWrapper) Put(key string, value proto.Message, opts ...datasync.PutOption) error

Put writes the provided key-value item into the data store. It returns an error if the item could not be written, nil otherwise.

func (*ProtoWrapper) Watch

func (db *ProtoWrapper) Watch(resp func(datasync.ProtoWatchResp), closeChan chan string, keys ...string) error

Watch subscribes for changes in datastore associated with any of the <keys>. Callback <resp> is used for delivery of watch events. Channel <closeChan> is used to close key-related goroutines Any encountered error is returned as well