dhash

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 Go to latest Published: Feb 7, 2013 License: BSD-2-Clause-Views Imports: 24 Imported by: 0

README

dhash

The distributed hash bits and pieces in god. Uses radix for tree structure, discord for routing and timenet for clock synchronization.

Inspiration

god is mainly inspired by the scalability of Chord/DHash, and the performance and feature set of Redis.

It tries to couple a performant in-memory database and simple yet powerful features with a scalable and operationally simple cluster concept.

Timestamps

To avoid temporarily disconnected nodes from rejoining the network and either reanimating deleted entries or just reintroducing previously changed data, all entries have a timestamp based on the time synchronization of the timenet.Timer.

All removed entries are replaced with a tombstone, also having a timestamp, which makes it less likely that old data may live again.

Tombstones are lazily removed after 24 hours, when data in their vicinity is changed. This makes it imperative that any network splits or temporarily dead nodes be fixed or cleaned before rejoining the main cluster again.

Synchronization

To ensure that all Nodes in the network have the data they should have, each node regularly synchronizes with those nodes that should have redundant copies of its data.

This is done by comparing their respective databases, and copying any entries with newer timestamps within the relevant range, using radix.Sync.

Cleaning

To ensure that all Nodes in the network get rid of the data they should not have, each node regularly cleans its database.

This is done by looking at the first entry it should not own (the first one after its own position), checking what other Node should own it, and then doing a destructive sync (again using radix.Sync) between the misplaced entry and the position of the proper owner.

Migration

Using non hashed values as keys in the cluster would normally cause severe imbalances between the Nodes, since it would be very unlikely that the spread out position they take by default would represent the actual keys used.

To avoid this, it is normally recommended to use a hashing function, for example murmur.Hash, to create keys for the data.

But to allow those user who so wish to use other data (perhaps ordered, or segmented in some way) as keys, the Nodes will migrate to cover roughly the same amount of data each.

This is done by comparing the owned entries (both tombstones and sub trees and regular data) each node owns to the data its successor owns, and if the predecessor owns too much it will decrease its position to achieve balance.

This is not a perfect mechanism, but it seems to even out the load quite a bit in situations where non hashed keys are used a lot.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type CleanListener 

type CleanListener func(source, dest common.Remote, cleaned, pushed int) (keep bool)

CleanListener is a function listening for clean events where one dhash.Node has cleaned items from itself and pushed items to another dhash.Node.

type Comm 

type Comm struct {
	Source      common.Remote
	Destination common.Remote
	Key         []byte
	SubKey      []byte
	Type        string
}

Comm contains metadata about one communication between two dhash.Nodes.

type CommListener 

type CommListener func(comm Comm) (keep bool)

CommListener is a function listening to generic communications between two dhash.Nodes.

type Conf 

type Conf struct {
	Key   string
	Value string
}

type HashTreeItem 

type HashTreeItem struct {
	Key       []radix.Nibble
	SubKey    []radix.Nibble
	Timestamp int64
	Expected  int64
	Value     []byte
	Exists    bool
}

type IndexRange 

type IndexRange struct {
	Key      []byte
	MinIndex *int
	MaxIndex *int
}

type JSONApi 

type JSONApi Node

func (*JSONApi) AddConfiguration 

func (self *JSONApi) AddConfiguration(co Conf, x *Nothing) (err error)

func (*JSONApi) Clear 

func (self *JSONApi) Clear(x Nothing, y *Nothing) (err error)

func (*JSONApi) Configuration 

func (self *JSONApi) Configuration(x Nothing, result *common.Conf) (err error)

func (*JSONApi) Count 

func (self *JSONApi) Count(kr KeyRange, result *int) (err error)

func (*JSONApi) Del 

func (self *JSONApi) Del(d KeyOp, n *Nothing) (err error)

func (*JSONApi) Describe 

func (self *JSONApi) Describe(x Nothing, result *common.DHashDescription) (err error)

func (*JSONApi) DescribeTree 

func (self *JSONApi) DescribeTree(x Nothing, result *string) (err error)

func (*JSONApi) First 

func (self *JSONApi) First(k KeyReq, result *SubValueRes) (err error)

func (*JSONApi) Get 

func (self *JSONApi) Get(k KeyReq, result *ValueRes) (err error)

func (*JSONApi) IndexOf 

func (self *JSONApi) IndexOf(i SubKeyReq, result *common.Index) (err error)

func (*JSONApi) Last 

func (self *JSONApi) Last(k KeyReq, result *SubValueRes) (err error)

func (*JSONApi) MirrorCount 

func (self *JSONApi) MirrorCount(kr KeyRange, result *int) (err error)

func (*JSONApi) MirrorFirst 

func (self *JSONApi) MirrorFirst(k KeyReq, result *SubValueRes) (err error)

func (*JSONApi) MirrorIndexOf 

func (self *JSONApi) MirrorIndexOf(i SubKeyReq, result *common.Index) (err error)

func (*JSONApi) MirrorLast 

func (self *JSONApi) MirrorLast(k KeyReq, result *SubValueRes) (err error)

func (*JSONApi) MirrorNextIndex 

func (self *JSONApi) MirrorNextIndex(i SubIndex, result *SubValueIndexRes) (err error)

func (*JSONApi) MirrorPrevIndex 

func (self *JSONApi) MirrorPrevIndex(i SubIndex, result *SubValueIndexRes) (err error)

func (*JSONApi) MirrorReverseIndexOf 

func (self *JSONApi) MirrorReverseIndexOf(i SubKeyReq, result *common.Index) (err error)

func (*JSONApi) MirrorReverseSlice 

func (self *JSONApi) MirrorReverseSlice(kr KeyRange, result *[]ValueRes) (err error)

func (*JSONApi) MirrorReverseSliceIndex 

func (self *JSONApi) MirrorReverseSliceIndex(ir IndexRange, result *[]ValueRes) (err error)

func (*JSONApi) MirrorReverseSliceLen 

func (self *JSONApi) MirrorReverseSliceLen(pr PageRange, result *[]ValueRes) (err error)

func (*JSONApi) MirrorSlice 

func (self *JSONApi) MirrorSlice(kr KeyRange, result *[]ValueRes) (err error)

func (*JSONApi) MirrorSliceIndex 

func (self *JSONApi) MirrorSliceIndex(ir IndexRange, result *[]ValueRes) (err error)

func (*JSONApi) MirrorSliceLen 

func (self *JSONApi) MirrorSliceLen(pr PageRange, result *[]ValueRes) (err error)

func (*JSONApi) Next 

func (self *JSONApi) Next(kr KeyReq, result *ValueRes) (err error)

func (*JSONApi) NextIndex 

func (self *JSONApi) NextIndex(i SubIndex, result *SubValueIndexRes) (err error)

func (*JSONApi) Nodes 

func (self *JSONApi) Nodes(x Nothing, result *common.Remotes) (err error)

func (*JSONApi) Owned 

func (self *JSONApi) Owned(x Nothing, result *int) (err error)

func (*JSONApi) Prev 

func (self *JSONApi) Prev(kr KeyReq, result *ValueRes) (err error)

func (*JSONApi) PrevIndex 

func (self *JSONApi) PrevIndex(i SubIndex, result *SubValueIndexRes) (err error)

func (*JSONApi) Put 

func (self *JSONApi) Put(d ValueOp, n *Nothing) (err error)

func (*JSONApi) ReverseIndexOf 

func (self *JSONApi) ReverseIndexOf(i SubKeyReq, result *common.Index) (err error)

func (*JSONApi) ReverseSlice 

func (self *JSONApi) ReverseSlice(kr KeyRange, result *[]ValueRes) (err error)

func (*JSONApi) ReverseSliceIndex 

func (self *JSONApi) ReverseSliceIndex(ir IndexRange, result *[]ValueRes) (err error)

func (*JSONApi) ReverseSliceLen 

func (self *JSONApi) ReverseSliceLen(pr PageRange, result *[]ValueRes) (err error)

func (*JSONApi) SetExpression 

func (self *JSONApi) SetExpression(expr setop.SetExpression, items *[]setop.SetOpResult) (err error)

func (*JSONApi) Size 

func (self *JSONApi) Size(x Nothing, result *int) (err error)

func (*JSONApi) Slice 

func (self *JSONApi) Slice(kr KeyRange, result *[]ValueRes) (err error)

func (*JSONApi) SliceIndex 

func (self *JSONApi) SliceIndex(ir IndexRange, result *[]ValueRes) (err error)

func (*JSONApi) SliceLen 

func (self *JSONApi) SliceLen(pr PageRange, result *[]ValueRes) (err error)

func (*JSONApi) SubAddConfiguration 

func (self *JSONApi) SubAddConfiguration(co SubConf, x *Nothing) (err error)

func (*JSONApi) SubClear 

func (self *JSONApi) SubClear(d SubKeyOp, n *Nothing) (err error)

func (*JSONApi) SubConfiguration 

func (self *JSONApi) SubConfiguration(k KeyReq, result *common.Conf) (err error)

func (*JSONApi) SubDel 

func (self *JSONApi) SubDel(d SubKeyOp, n *Nothing) (err error)

func (*JSONApi) SubGet 

func (self *JSONApi) SubGet(k SubKeyReq, result *SubValueRes) (err error)

func (*JSONApi) SubMirrorNext 

func (self *JSONApi) SubMirrorNext(k SubKeyReq, result *SubValueRes) (err error)

func (*JSONApi) SubMirrorPrev 

func (self *JSONApi) SubMirrorPrev(k SubKeyReq, result *SubValueRes) (err error)

func (*JSONApi) SubNext 

func (self *JSONApi) SubNext(k SubKeyReq, result *SubValueRes) (err error)

func (*JSONApi) SubPrev 

func (self *JSONApi) SubPrev(k SubKeyReq, result *SubValueRes) (err error)

func (*JSONApi) SubPut 

func (self *JSONApi) SubPut(d SubValueOp, n *Nothing) (err error)

func (*JSONApi) SubSize 

func (self *JSONApi) SubSize(k KeyReq, result *int) (err error)

type JSONClient 

type JSONClient string

JSONClient is used in the tests to ensure that the JSON API provides roughly the same functionality as the gob API. It is also a demonstration and example of how the JSON API can be used. It is NOT meant to be used as a real client, since if you are using Go anyway the client.Conn type is much more efficient.

func (JSONClient) AddConfiguration 

func (self JSONClient) AddConfiguration(key, value string)

func (JSONClient) Count 

func (self JSONClient) Count(key, min, max []byte, mininc, maxinc bool) (result int)

func (JSONClient) Del 

func (self JSONClient) Del(key []byte)

func (JSONClient) First 

func (self JSONClient) First(key []byte) (firstKey, firstValue []byte, existed bool)

func (JSONClient) Get 

func (self JSONClient) Get(key []byte) (value []byte, existed bool)

func (JSONClient) IndexOf 

func (self JSONClient) IndexOf(key, subKey []byte) (index int, existed bool)

func (JSONClient) Last 

func (self JSONClient) Last(key []byte) (lastKey, lastValue []byte, existed bool)

func (JSONClient) MirrorCount 

func (self JSONClient) MirrorCount(key, min, max []byte, mininc, maxinc bool) (result int)

func (JSONClient) MirrorFirst 

func (self JSONClient) MirrorFirst(key []byte) (firstKey, firstValue []byte, existed bool)

func (JSONClient) MirrorIndexOf 

func (self JSONClient) MirrorIndexOf(key, subKey []byte) (index int, existed bool)

func (JSONClient) MirrorLast 

func (self JSONClient) MirrorLast(key []byte) (lastKey, lastValue []byte, existed bool)

func (JSONClient) MirrorNextIndex 

func (self JSONClient) MirrorNextIndex(key []byte, index int) (foundKey, foundValue []byte, foundIndex int, existed bool)

func (JSONClient) MirrorPrevIndex 

func (self JSONClient) MirrorPrevIndex(key []byte, index int) (foundKey, foundValue []byte, foundIndex int, existed bool)

func (JSONClient) MirrorReverseIndexOf 

func (self JSONClient) MirrorReverseIndexOf(key, subKey []byte) (index int, existed bool)

func (JSONClient) MirrorReverseSlice 

func (self JSONClient) MirrorReverseSlice(key, min, max []byte, mininc, maxinc bool) (result []common.Item)

func (JSONClient) MirrorReverseSliceIndex 

func (self JSONClient) MirrorReverseSliceIndex(key []byte, min, max *int) (result []common.Item)

func (JSONClient) MirrorReverseSliceLen 

func (self JSONClient) MirrorReverseSliceLen(key, max []byte, maxinc bool, maxRes int) (result []common.Item)

func (JSONClient) MirrorSlice 

func (self JSONClient) MirrorSlice(key, min, max []byte, mininc, maxinc bool) (result []common.Item)

func (JSONClient) MirrorSliceIndex 

func (self JSONClient) MirrorSliceIndex(key []byte, min, max *int) (result []common.Item)

func (JSONClient) MirrorSliceLen 

func (self JSONClient) MirrorSliceLen(key, min []byte, mininc bool, maxRes int) (result []common.Item)

func (JSONClient) Next 

func (self JSONClient) Next(key []byte) (nextKey, nextValue []byte, existed bool)

func (JSONClient) NextIndex 

func (self JSONClient) NextIndex(key []byte, index int) (foundKey, foundValue []byte, foundIndex int, existed bool)

func (JSONClient) Prev 

func (self JSONClient) Prev(key []byte) (prevKey, prevValue []byte, existed bool)

func (JSONClient) PrevIndex 

func (self JSONClient) PrevIndex(key []byte, index int) (foundKey, foundValue []byte, foundIndex int, existed bool)

func (JSONClient) Put 

func (self JSONClient) Put(key, value []byte)

func (JSONClient) ReverseIndexOf 

func (self JSONClient) ReverseIndexOf(key, subKey []byte) (index int, existed bool)

func (JSONClient) ReverseSlice 

func (self JSONClient) ReverseSlice(key, min, max []byte, mininc, maxinc bool) (result []common.Item)

func (JSONClient) ReverseSliceIndex 

func (self JSONClient) ReverseSliceIndex(key []byte, min, max *int) (result []common.Item)

func (JSONClient) ReverseSliceLen 

func (self JSONClient) ReverseSliceLen(key, max []byte, maxinc bool, maxRes int) (result []common.Item)

func (JSONClient) SDel 

func (self JSONClient) SDel(key []byte)

func (JSONClient) SPut 

func (self JSONClient) SPut(key, value []byte)

func (JSONClient) SSubClear 

func (self JSONClient) SSubClear(key []byte)

func (JSONClient) SSubDel 

func (self JSONClient) SSubDel(key, subKey []byte)

func (JSONClient) SSubPut 

func (self JSONClient) SSubPut(key, subKey, value []byte)

func (JSONClient) SetExpression 

func (self JSONClient) SetExpression(expr setop.SetExpression) (result []setop.SetOpResult)

func (JSONClient) Size 

func (self JSONClient) Size() (result int)

func (JSONClient) Slice 

func (self JSONClient) Slice(key, min, max []byte, mininc, maxinc bool) (result []common.Item)

func (JSONClient) SliceIndex 

func (self JSONClient) SliceIndex(key []byte, min, max *int) (result []common.Item)

func (JSONClient) SliceLen 

func (self JSONClient) SliceLen(key, min []byte, mininc bool, maxRes int) (result []common.Item)

func (JSONClient) SubAddConfiguration 

func (self JSONClient) SubAddConfiguration(treeKey []byte, key, value string)

func (JSONClient) SubClear 

func (self JSONClient) SubClear(key []byte)

func (JSONClient) SubDel 

func (self JSONClient) SubDel(key, subKey []byte)

func (JSONClient) SubGet 

func (self JSONClient) SubGet(key, subKey []byte) (value []byte, existed bool)

func (JSONClient) SubMirrorNext 

func (self JSONClient) SubMirrorNext(key, subKey []byte) (nextKey, nextValue []byte, existed bool)

func (JSONClient) SubMirrorPrev 

func (self JSONClient) SubMirrorPrev(key, subKey []byte) (prevKey, prevValue []byte, existed bool)

func (JSONClient) SubNext 

func (self JSONClient) SubNext(key, subKey []byte) (nextKey, nextValue []byte, existed bool)

func (JSONClient) SubPrev 

func (self JSONClient) SubPrev(key, subKey []byte) (prevKey, prevValue []byte, existed bool)

func (JSONClient) SubPut 

func (self JSONClient) SubPut(key, subKey, value []byte)

func (JSONClient) SubSize 

func (self JSONClient) SubSize(key []byte) (result int)

type KeyOp 

type KeyOp struct {
	Key  []byte
	Sync bool
}

type KeyRange 

type KeyRange struct {
	Key    []byte
	Min    []byte
	Max    []byte
	MinInc bool
	MaxInc bool
}

type KeyReq 

type KeyReq struct {
	Key []byte
}

type MigrateListener 

type MigrateListener func(dhash *Node, source, destination []byte) (keep bool)

MigrateListener is a function listening for migrate events where one dhash.Node has migrated from one position to another.

type Node 

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

Node is a node in the database. It contains a discord.Node containing routing and rpc functionality, a timenet.Timer containing time synchronization functionality and a radix.Tree containing the actual data.

func NewNode 

func NewNode(listenAddr, broadcastAddr string) *Node

func NewNodeDir 

func NewNodeDir(listenAddr, broadcastAddr, dir string) (result *Node)

NewNode will return a dhash.Node publishing itself on the given address.

func (*Node) AddChangeListener 

func (self *Node) AddChangeListener(f common.RingChangeListener)

func (*Node) AddCleanListener 

func (self *Node) AddCleanListener(l CleanListener)

func (*Node) AddCommListener 

func (self *Node) AddCommListener(l CommListener)

func (*Node) AddConfiguration 

func (self *Node) AddConfiguration(c common.ConfItem)

func (*Node) AddMigrateListener 

func (self *Node) AddMigrateListener(l MigrateListener)

func (*Node) AddSyncListener 

func (self *Node) AddSyncListener(l SyncListener)

func (*Node) Clear 

func (self *Node) Clear()

func (*Node) Configuration 

func (self *Node) Configuration(x int, result *common.Conf) error

func (*Node) Count 

func (self *Node) Count(r common.Range, result *int) error

func (*Node) Del 

func (self *Node) Del(data common.Item) error

func (*Node) Describe 

func (self *Node) Describe() string

Describe will return a humanly readable string describing the node.

func (*Node) DescribeTree 

func (self *Node) DescribeTree() string

DescribeTree will return a humanly readable string describing the node contents.

func (*Node) Description 

func (self *Node) Description() common.DHashDescription

Description will return a current description of the node.

func (*Node) First 

func (self *Node) First(data common.Item, result *common.Item) error

func (*Node) Get 

func (self *Node) Get(data common.Item, result *common.Item) error

func (*Node) GetBroadcastAddr 

func (self *Node) GetBroadcastAddr() string

func (*Node) IndexOf 

func (self *Node) IndexOf(data common.Item, result *common.Index) error

func (*Node) Last 

func (self *Node) Last(data common.Item, result *common.Item) error

func (*Node) MirrorCount 

func (self *Node) MirrorCount(r common.Range, result *int) error

func (*Node) MirrorFirst 

func (self *Node) MirrorFirst(data common.Item, result *common.Item) error

func (*Node) MirrorIndexOf 

func (self *Node) MirrorIndexOf(data common.Item, result *common.Index) error

func (*Node) MirrorLast 

func (self *Node) MirrorLast(data common.Item, result *common.Item) error

func (*Node) MirrorNextIndex 

func (self *Node) MirrorNextIndex(data common.Item, result *common.Item) error

func (*Node) MirrorPrevIndex 

func (self *Node) MirrorPrevIndex(data common.Item, result *common.Item) error

func (*Node) MirrorReverseIndexOf 

func (self *Node) MirrorReverseIndexOf(data common.Item, result *common.Index) error

func (*Node) MirrorReverseSlice 

func (self *Node) MirrorReverseSlice(r common.Range, items *[]common.Item) error

func (*Node) MirrorReverseSliceIndex 

func (self *Node) MirrorReverseSliceIndex(r common.Range, items *[]common.Item) error

func (*Node) MirrorReverseSliceLen 

func (self *Node) MirrorReverseSliceLen(r common.Range, items *[]common.Item) error

func (*Node) MirrorSlice 

func (self *Node) MirrorSlice(r common.Range, items *[]common.Item) error

func (*Node) MirrorSliceIndex 

func (self *Node) MirrorSliceIndex(r common.Range, items *[]common.Item) error

func (*Node) MirrorSliceLen 

func (self *Node) MirrorSliceLen(r common.Range, items *[]common.Item) error

func (*Node) MustJoin 

func (self *Node) MustJoin(addr string)

func (*Node) MustStart 

func (self *Node) MustStart() *Node

func (*Node) Next 

func (self *Node) Next(data common.Item, result *common.Item) error

func (*Node) NextIndex 

func (self *Node) NextIndex(data common.Item, result *common.Item) error

func (*Node) Owned 

func (self *Node) Owned() int

Owned returns the number of items, including tombstones, that this node has responsibility for.

func (*Node) Prev 

func (self *Node) Prev(data common.Item, result *common.Item) error

func (*Node) PrevIndex 

func (self *Node) PrevIndex(data common.Item, result *common.Item) error

func (*Node) Put 

func (self *Node) Put(data common.Item) error

func (*Node) ReverseIndexOf 

func (self *Node) ReverseIndexOf(data common.Item, result *common.Index) error

func (*Node) ReverseSlice 

func (self *Node) ReverseSlice(r common.Range, items *[]common.Item) error

func (*Node) ReverseSliceIndex 

func (self *Node) ReverseSliceIndex(r common.Range, items *[]common.Item) error

func (*Node) ReverseSliceLen 

func (self *Node) ReverseSliceLen(r common.Range, items *[]common.Item) error

func (*Node) RingHash 

func (self *Node) RingHash(x int, ringHash *[]byte) error

func (*Node) SetExpression 

func (self *Node) SetExpression(expr setop.SetExpression, items *[]setop.SetOpResult) (err error)

func (*Node) Size 

func (self *Node) Size() int

func (*Node) Slice 

func (self *Node) Slice(r common.Range, items *[]common.Item) error

func (*Node) SliceIndex 

func (self *Node) SliceIndex(r common.Range, items *[]common.Item) error

func (*Node) SliceLen 

func (self *Node) SliceLen(r common.Range, items *[]common.Item) error

func (*Node) Start 

func (self *Node) Start() (err error)

Start will spin up this dhash.Node, including its discord.Node and timenet.Timer. It will also start the sync, clean and migrate jobs.

func (*Node) Stop 

func (self *Node) Stop()

Stop will shut down this dhash.Node, including its discord.Node and timenet.Timer, permanently.

func (*Node) SubAddConfiguration 

func (self *Node) SubAddConfiguration(c common.ConfItem)

func (*Node) SubClear 

func (self *Node) SubClear(data common.Item) error

func (*Node) SubConfiguration 

func (self *Node) SubConfiguration(key []byte, result *common.Conf) error

func (*Node) SubDel 

func (self *Node) SubDel(data common.Item) error

func (*Node) SubGet 

func (self *Node) SubGet(data common.Item, result *common.Item) error

func (*Node) SubMirrorNext 

func (self *Node) SubMirrorNext(data common.Item, result *common.Item) error

func (*Node) SubMirrorPrev 

func (self *Node) SubMirrorPrev(data common.Item, result *common.Item) error

func (*Node) SubNext 

func (self *Node) SubNext(data common.Item, result *common.Item) error

func (*Node) SubPrev 

func (self *Node) SubPrev(data common.Item, result *common.Item) error

func (*Node) SubPut 

func (self *Node) SubPut(data common.Item) error

func (*Node) SubSize 

func (self *Node) SubSize(key []byte, result *int) error

func (*Node) Time 

func (self *Node) Time() time.Time

type Nothing 

type Nothing struct{}

type PageRange 

type PageRange struct {
	Key     []byte
	From    []byte
	FromInc bool
	Len     int
}

type SubConf 

type SubConf struct {
	TreeKey []byte
	Key     string
	Value   string
}

type SubIndex 

type SubIndex struct {
	Key   []byte
	Index int
}

type SubKeyOp 

type SubKeyOp struct {
	Key    []byte
	SubKey []byte
	Sync   bool
}

type SubKeyReq 

type SubKeyReq struct {
	Key    []byte
	SubKey []byte
}

type SubValueIndexRes 

type SubValueIndexRes struct {
	Key    []byte
	SubKey []byte
	Value  []byte
	Index  int
	Exists bool
}

type SubValueOp 

type SubValueOp struct {
	Key    []byte
	SubKey []byte
	Value  []byte
	Sync   bool
}

type SubValueRes 

type SubValueRes struct {
	Key    []byte
	SubKey []byte
	Value  []byte
	Exists bool
}

type SyncListener 

type SyncListener func(source, dest common.Remote, pulled, pushed int) (keep bool)

SyncListener is a function listening for sync events where one dhash.Node has pushed items to, and pulled items from, another dhash.Node.

type ValueOp 

type ValueOp struct {
	Key   []byte
	Value []byte
	Sync  bool
}

type ValueRes 

type ValueRes struct {
	Key    []byte
	Value  []byte
	Exists bool
}

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