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statedb.go
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statedb.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package statedb
import (
"fmt"
"sort"
"github.com/hyperledger/fabric/core/common/ccprovider"
"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/version"
"github.com/hyperledger/fabric/core/ledger/util"
)
//go:generate counterfeiter -o mock/results_iterator.go -fake-name ResultsIterator . ResultsIterator
//go:generate counterfeiter -o mock/versioned_db.go -fake-name VersionedDB . VersionedDB
// VersionedDBProvider provides an instance of an versioned DB
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()
}
// VersionedDB lists methods that a db is supposed to implement
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
// BytesKeySuppoted 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
BytesKeySuppoted() bool
// Open opens the db
Open() error
// Close closes the db
Close()
}
//BulkOptimizable interface provides additional functions for
//databases capable of batch operations
type BulkOptimizable interface {
LoadCommittedVersions(keys []*CompositeKey) error
GetCachedVersion(namespace, key string) (*version.Height, bool)
ClearCachedVersions()
}
//IndexCapable interface provides additional functions for
//databases capable of index operations
type IndexCapable interface {
GetDBType() string
ProcessIndexesForChaincodeDeploy(namespace string, fileEntries []*ccprovider.TarFileEntry) error
}
// CompositeKey encloses Namespace and Key components
type CompositeKey struct {
Namespace string
Key string
}
// VersionedValue encloses value and corresponding version
type VersionedValue struct {
Value []byte
Metadata []byte
Version *version.Height
}
// IsDelete returns true if this update indicates delete of a key
func (vv *VersionedValue) IsDelete() bool {
return vv.Value == nil
}
// VersionedKV encloses key and corresponding VersionedValue
type VersionedKV struct {
CompositeKey
VersionedValue
}
// ResultsIterator iterates over query results
type ResultsIterator interface {
Next() (QueryResult, error)
Close()
}
// QueryResultsIterator adds GetBookmarkAndClose method
type QueryResultsIterator interface {
ResultsIterator
GetBookmarkAndClose() string
}
// QueryResult - a general interface for supporting different types of query results. Actual types differ for different queries
type QueryResult interface{}
type nsUpdates struct {
m map[string]*VersionedValue
}
func newNsUpdates() *nsUpdates {
return &nsUpdates{make(map[string]*VersionedValue)}
}
// UpdateBatch encloses the details of multiple `updates`
type UpdateBatch struct {
updates map[string]*nsUpdates
}
// NewUpdateBatch constructs an instance of a Batch
func NewUpdateBatch() *UpdateBatch {
return &UpdateBatch{make(map[string]*nsUpdates)}
}
// Get returns the VersionedValue for the given namespace and key
func (batch *UpdateBatch) Get(ns string, key string) *VersionedValue {
nsUpdates, ok := batch.updates[ns]
if !ok {
return nil
}
vv, ok := nsUpdates.m[key]
if !ok {
return nil
}
return vv
}
// Put adds a key with value only. The metadata is assumed to be nil
func (batch *UpdateBatch) Put(ns string, key string, value []byte, version *version.Height) {
batch.PutValAndMetadata(ns, key, value, nil, version)
}
// 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 (batch *UpdateBatch) PutValAndMetadata(ns string, key string, value []byte, metadata []byte, version *version.Height) {
if value == nil {
panic("Nil value not allowed. Instead call 'Delete' function")
}
batch.Update(ns, key, &VersionedValue{value, metadata, version})
}
// Delete deletes a Key and associated value
func (batch *UpdateBatch) Delete(ns string, key string, version *version.Height) {
batch.Update(ns, key, &VersionedValue{nil, nil, version})
}
// Exists checks whether the given key exists in the batch
func (batch *UpdateBatch) Exists(ns string, key string) bool {
nsUpdates, ok := batch.updates[ns]
if !ok {
return false
}
_, ok = nsUpdates.m[key]
return ok
}
// GetUpdatedNamespaces returns the names of the namespaces that are updated
func (batch *UpdateBatch) GetUpdatedNamespaces() []string {
namespaces := make([]string, len(batch.updates))
i := 0
for ns := range batch.updates {
namespaces[i] = ns
i++
}
return namespaces
}
// Update updates the batch with a latest entry for a namespace and a key
func (batch *UpdateBatch) Update(ns string, key string, vv *VersionedValue) {
batch.getOrCreateNsUpdates(ns).m[key] = vv
}
// GetUpdates returns all the updates for a namespace
func (batch *UpdateBatch) GetUpdates(ns string) map[string]*VersionedValue {
nsUpdates, ok := batch.updates[ns]
if !ok {
return nil
}
return nsUpdates.m
}
// 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 (batch *UpdateBatch) GetRangeScanIterator(ns string, startKey string, endKey string) QueryResultsIterator {
return newNsIterator(ns, startKey, endKey, batch)
}
func (batch *UpdateBatch) getOrCreateNsUpdates(ns string) *nsUpdates {
nsUpdates := batch.updates[ns]
if nsUpdates == nil {
nsUpdates = newNsUpdates()
batch.updates[ns] = nsUpdates
}
return nsUpdates
}
type nsIterator struct {
ns string
nsUpdates *nsUpdates
sortedKeys []string
nextIndex int
lastIndex int
}
func newNsIterator(ns string, startKey string, endKey string, batch *UpdateBatch) *nsIterator {
nsUpdates, ok := batch.updates[ns]
if !ok {
return &nsIterator{}
}
sortedKeys := util.GetSortedKeys(nsUpdates.m)
var nextIndex int
var lastIndex int
if startKey == "" {
nextIndex = 0
} else {
nextIndex = sort.SearchStrings(sortedKeys, startKey)
}
if endKey == "" {
lastIndex = len(sortedKeys)
} else {
lastIndex = sort.SearchStrings(sortedKeys, endKey)
}
return &nsIterator{ns, nsUpdates, sortedKeys, nextIndex, lastIndex}
}
// Next gives next key and versioned value. It returns a nil when exhausted
func (itr *nsIterator) Next() (QueryResult, error) {
if itr.nextIndex >= itr.lastIndex {
return nil, nil
}
key := itr.sortedKeys[itr.nextIndex]
vv := itr.nsUpdates.m[key]
itr.nextIndex++
return &VersionedKV{CompositeKey{itr.ns, key}, VersionedValue{vv.Value, vv.Metadata, vv.Version}}, nil
}
// Close implements the method from QueryResult interface
func (itr *nsIterator) Close() {
// do nothing
}
// GetBookmarkAndClose implements the method from QueryResult interface
func (itr *nsIterator) GetBookmarkAndClose() string {
// do nothing
return ""
}
const optionLimit = "limit"
// ValidateRangeMetadata validates the JSON containing attributes for the range query
func ValidateRangeMetadata(metadata map[string]interface{}) error {
for key, keyVal := range metadata {
switch key {
case optionLimit:
//Verify the pageSize is an integer
if _, ok := keyVal.(int32); ok {
continue
}
return fmt.Errorf("Invalid entry, \"limit\" must be a int32")
default:
return fmt.Errorf("Invalid entry, option %s not recognized", key)
}
}
return nil
}