statedb

package
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 Go to latest Published: Feb 26, 2020 License: Apache-2.0 Imports: 8 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func ValidateRangeMetadata added in v1.3.0 

func ValidateRangeMetadata(metadata map[string]interface{}) error

ValidateRangeMetadata validates the JSON containing attributes for the range query

Types

type BulkOptimizable added in v1.1.0 

type BulkOptimizable interface {
	LoadCommittedVersions(keys []*CompositeKey) error
	GetCachedVersion(namespace, key string) (*version.Height, bool)
	ClearCachedVersions()
}

BulkOptimizable interface provides additional functions for databases capable of batch operations

type Cache 

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

Cache holds both the system and user cache

func NewCache 

func NewCache(usrCacheSizeMBs int, sysNamespaces []string) *Cache

NewCache creates a Cache. The cache consists of both system state cache (for lscc, _lifecycle) and user state cache (for all user deployed chaincodes). The size of the system state cache is 64 MB, by default. The size of the user state cache, in terms of MB, is specified via usrCacheSize parameter. Note that the maximum memory consumption of fastcache would be in the multiples of 32 MB (due to 512 buckets & an equal number of 64 KB chunks per bucket). If the usrCacheSizeMBs is not a multiple of 32 MB, the fastcache would round the size to the next multiple of 32 MB.

func (*Cache) Enabled 

func (c *Cache) Enabled(namespace string) bool

Enabled returns true if the cache is enabled for a given namespace. Namespace can be of two types: system namespace (such as lscc) and user namespace (all user's chaincode states).

func (*Cache) GetState 

func (c *Cache) GetState(chainID, namespace, key string) (*CacheValue, error)

GetState returns the value for a given namespace and key from a cache associated with the chainID.

func (*Cache) PutState 

func (c *Cache) PutState(chainID, namespace, key string, cacheValue *CacheValue) error

PutState stores a given value in a cache associated with the chainID.

func (*Cache) Reset 

func (c *Cache) Reset()

Reset removes all the items from the cache.

func (*Cache) UpdateStates 

func (c *Cache) UpdateStates(chainID string, updates CacheUpdates) error

UpdateStates updates only the existing entries in the cache associated with the chainID.

type CacheKVs 

type CacheKVs map[string]*CacheValue

CacheKVs is a map from a key to a cache value

type CacheUpdates 

type CacheUpdates map[string]CacheKVs

CacheUpdates is a map from a namespace to a set of cache KV updates

func (CacheUpdates) Add 

func (u CacheUpdates) Add(namespace string, ckvs CacheKVs)

Add adds the given cacheKVs to the CacheUpdates

type CacheValue 

type CacheValue struct {
	VersionBytes         []byte   `protobuf:"bytes,1,opt,name=version_bytes,json=versionBytes,proto3" json:"version_bytes,omitempty"`
	Value                []byte   `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
	Metadata             []byte   `protobuf:"bytes,3,opt,name=metadata,proto3" json:"metadata,omitempty"`
	AdditionalInfo       []byte   `protobuf:"bytes,4,opt,name=additional_info,json=additionalInfo,proto3" json:"additional_info,omitempty"`
	XXX_NoUnkeyedLiteral struct{} `json:"-"`
	XXX_unrecognized     []byte   `json:"-"`
	XXX_sizecache        int32    `json:"-"`
}

func (*CacheValue) Descriptor 

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

func (*CacheValue) GetAdditionalInfo 

func (m *CacheValue) GetAdditionalInfo() []byte

func (*CacheValue) GetMetadata 

func (m *CacheValue) GetMetadata() []byte

func (*CacheValue) GetValue 

func (m *CacheValue) GetValue() []byte

func (*CacheValue) GetVersionBytes 

func (m *CacheValue) GetVersionBytes() []byte

func (*CacheValue) ProtoMessage 

func (*CacheValue) ProtoMessage()

func (*CacheValue) Reset 

func (m *CacheValue) Reset()

func (*CacheValue) String 

func (m *CacheValue) String() string

func (*CacheValue) XXX_DiscardUnknown 

func (m *CacheValue) XXX_DiscardUnknown()

func (*CacheValue) XXX_Marshal 

func (m *CacheValue) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*CacheValue) XXX_Merge 

func (m *CacheValue) XXX_Merge(src proto.Message)

func (*CacheValue) XXX_Size 

func (m *CacheValue) XXX_Size() int

func (*CacheValue) XXX_Unmarshal 

func (m *CacheValue) XXX_Unmarshal(b []byte) error

type CompositeKey 

type CompositeKey struct {
	Namespace string
	Key       string
}

CompositeKey encloses Namespace and Key components

type IndexCapable added in v1.2.0 

type IndexCapable interface {
	GetDBType() string
	ProcessIndexesForChaincodeDeploy(namespace string, fileEntries []*ccprovider.TarFileEntry) error
}

IndexCapable interface provides additional functions for databases capable of index operations

type QueryResult 

type QueryResult interface{}

QueryResult - a general interface for supporting different types of query results. Actual types differ for different queries

type QueryResultsIterator added in v1.3.0 

type QueryResultsIterator interface {
	ResultsIterator
	GetBookmarkAndClose() string
}

QueryResultsIterator adds GetBookmarkAndClose method

type ResultsIterator 

type ResultsIterator interface {
	Next() (QueryResult, error)
	Close()
}

ResultsIterator iterates over query results

type UpdateBatch 

type UpdateBatch struct {
	ContainsPostOrderWrites bool
	Updates                 map[string]*nsUpdates
}

UpdateBatch encloses the details of multiple `updates`

func NewUpdateBatch 

func NewUpdateBatch() *UpdateBatch

NewUpdateBatch constructs an instance of a Batch

func (*UpdateBatch) Delete 

func (batch *UpdateBatch) Delete(ns string, key string, version *version.Height)

Delete deletes a Key and associated value

func (*UpdateBatch) Exists 

func (batch *UpdateBatch) Exists(ns string, key string) bool

Exists checks whether the given key exists in the batch

func (*UpdateBatch) Get 

func (batch *UpdateBatch) Get(ns string, key string) *VersionedValue

Get returns the VersionedValue for the given namespace and key

func (*UpdateBatch) GetRangeScanIterator 

func (batch *UpdateBatch) GetRangeScanIterator(ns string, startKey string, endKey string) QueryResultsIterator

GetRangeScanIterator returns an iterator that iterates over keys of a specific namespace in sorted order In other word this gives the same functionality over the contents in the `UpdateBatch` as `VersionedDB.GetStateRangeScanIterator()` method gives over the contents in the statedb This function can be used for querying the contents in the updateBatch before they are committed to the statedb. For instance, a validator implementation can used this to verify the validity of a range query of a transaction where the UpdateBatch represents the union of the modifications performed by the preceding valid transactions in the same block (Assuming Group commit approach where we commit all the updates caused by a block together).

func (*UpdateBatch) GetUpdatedNamespaces 

func (batch *UpdateBatch) GetUpdatedNamespaces() []string

GetUpdatedNamespaces returns the names of the namespaces that are updated

func (*UpdateBatch) GetUpdates 

func (batch *UpdateBatch) GetUpdates(ns string) map[string]*VersionedValue

GetUpdates returns all the updates for a namespace

func (*UpdateBatch) Merge 

func (batch *UpdateBatch) Merge(toMerge *UpdateBatch)

Merge merges another updates batch with this updates batch

func (*UpdateBatch) Put 

func (batch *UpdateBatch) Put(ns string, key string, value []byte, version *version.Height)

Put adds a key with value only. The metadata is assumed to be nil

func (*UpdateBatch) PutValAndMetadata added in v1.3.0 

func (batch *UpdateBatch) PutValAndMetadata(ns string, key string, value []byte, metadata []byte, version *version.Height)

PutValAndMetadata adds a key with value and metadata TODO introducing a new function to limit the refactoring. Later in a separate CR, the 'Put' function above should be removed

func (*UpdateBatch) Update added in v1.1.0 

func (batch *UpdateBatch) Update(ns string, key string, vv *VersionedValue)

Update updates the batch with a latest entry for a namespace and a key

type VersionedDB 

type VersionedDB interface {
	// GetState gets the value for given namespace and key. For a chaincode, the namespace corresponds to the chaincodeId
	GetState(namespace string, key string) (*VersionedValue, error)
	// GetVersion gets the version for given namespace and key. For a chaincode, the namespace corresponds to the chaincodeId
	GetVersion(namespace string, key string) (*version.Height, error)
	// GetStateMultipleKeys gets the values for multiple keys in a single call
	GetStateMultipleKeys(namespace string, keys []string) ([]*VersionedValue, error)
	// GetStateRangeScanIterator returns an iterator that contains all the key-values between given key ranges.
	// startKey is inclusive
	// endKey is exclusive
	// The returned ResultsIterator contains results of type *VersionedKV
	GetStateRangeScanIterator(namespace string, startKey string, endKey string) (ResultsIterator, error)
	// GetStateRangeScanIteratorWithMetadata returns an iterator that contains all the key-values between given key ranges.
	// startKey is inclusive
	// endKey is exclusive
	// metadata is a map of additional query parameters
	// The returned ResultsIterator contains results of type *VersionedKV
	GetStateRangeScanIteratorWithMetadata(namespace string, startKey string, endKey string, metadata map[string]interface{}) (QueryResultsIterator, error)
	// ExecuteQuery executes the given query and returns an iterator that contains results of type *VersionedKV.
	ExecuteQuery(namespace, query string) (ResultsIterator, error)
	// ExecuteQueryWithMetadata executes the given query with associated query options and
	// returns an iterator that contains results of type *VersionedKV.
	// metadata is a map of additional query parameters
	ExecuteQueryWithMetadata(namespace, query string, metadata map[string]interface{}) (QueryResultsIterator, error)
	// ApplyUpdates applies the batch to the underlying db.
	// height is the height of the highest transaction in the Batch that
	// a state db implementation is expected to ues as a save point
	ApplyUpdates(batch *UpdateBatch, height *version.Height) error
	// GetLatestSavePoint returns the height of the highest transaction upto which
	// the state db is consistent
	GetLatestSavePoint() (*version.Height, error)
	// ValidateKeyValue tests whether the key and value is supported by the db implementation.
	// For instance, leveldb supports any bytes for the key while the couchdb supports only valid utf-8 string
	// TODO make the function ValidateKeyValue return a specific error say ErrInvalidKeyValue
	// However, as of now, the both implementations of this function (leveldb and couchdb) are deterministic in returing an error
	// i.e., an error is returned only if the key-value are found to be invalid for the underlying db
	ValidateKeyValue(key string, value []byte) error
	// BytesKeySupported returns true if the implementation (underlying db) supports the any bytes to be used as key.
	// For instance, leveldb supports any bytes for the key while the couchdb supports only valid utf-8 string
	BytesKeySupported() bool
	// Open opens the db
	Open() error
	// Close closes the db
	Close()
}

VersionedDB lists methods that a db is supposed to implement

type VersionedDBProvider 

type VersionedDBProvider interface {
	// GetDBHandle returns a handle to a VersionedDB
	GetDBHandle(id string) (VersionedDB, error)
	// Close closes all the VersionedDB instances and releases any resources held by VersionedDBProvider
	Close()
}

VersionedDBProvider provides an instance of an versioned DB

type VersionedKV 

type VersionedKV struct {
	CompositeKey
	VersionedValue
}

VersionedKV encloses key and corresponding VersionedValue

type VersionedValue 

type VersionedValue struct {
	Value    []byte
	Metadata []byte
	Version  *version.Height
}

VersionedValue encloses value and corresponding version

func (*VersionedValue) IsDelete added in v1.3.0 

func (vv *VersionedValue) IsDelete() bool

IsDelete returns true if this update indicates delete of a key

Source Files

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Directories

Path Synopsis
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