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plugin_validator.go
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plugin_validator.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package txvalidator
import (
"fmt"
"sync"
"github.com/hyperledger/fabric/common/cauthdsl"
ledger2 "github.com/hyperledger/fabric/common/ledger"
"github.com/hyperledger/fabric/core/handlers/validation/api"
. "github.com/hyperledger/fabric/core/handlers/validation/api/capabilities"
. "github.com/hyperledger/fabric/core/handlers/validation/api/identities"
. "github.com/hyperledger/fabric/core/handlers/validation/api/state"
"github.com/hyperledger/fabric/core/ledger"
"github.com/hyperledger/fabric/msp"
"github.com/hyperledger/fabric/protos/common"
"github.com/pkg/errors"
)
// MapBasedPluginMapper maps plugin names to their corresponding factories
type MapBasedPluginMapper map[string]validation.PluginFactory
// PluginFactoryByName returns a plugin factory for the given plugin name, or nil if not found
func (m MapBasedPluginMapper) PluginFactoryByName(name PluginName) validation.PluginFactory {
return m[string(name)]
}
//go:generate mockery -dir . -name PluginMapper -case underscore -output mocks/
//go:generate mockery -dir ../../handlers/validation/api/ -name PluginFactory -case underscore -output mocks/
//go:generate mockery -dir ../../handlers/validation/api/ -name Plugin -case underscore -output mocks/
// PluginMapper maps plugin names to their corresponding factory instance.
// Returns nil if the name isn't associated to any plugin.
type PluginMapper interface {
PluginFactoryByName(name PluginName) validation.PluginFactory
}
//go:generate mockery -dir . -name QueryExecutorCreator -case underscore -output mocks/
// QueryExecutorCreator creates new query executors
type QueryExecutorCreator interface {
NewQueryExecutor() (ledger.QueryExecutor, error)
}
// Context defines information about a transaction
// that is being validated
type Context struct {
Seq int
Envelope []byte
TxID string
Channel string
VSCCName string
Policy []byte
Namespace string
Block *common.Block
}
// String returns a string representation of this Context
func (c Context) String() string {
return fmt.Sprintf("Tx %s, seq %d out of %d in block %d for channel %s with validation plugin %s", c.TxID, c.Seq, len(c.Block.Data.Data), c.Block.Header.Number, c.Channel, c.VSCCName)
}
// PluginValidator values transactions with validation plugins
type PluginValidator struct {
sync.Mutex
pluginChannelMapping map[PluginName]*pluginsByChannel
PluginMapper
QueryExecutorCreator
msp.IdentityDeserializer
capabilities Capabilities
}
//go:generate mockery -dir ../../handlers/validation/api/capabilities/ -name Capabilities -case underscore -output mocks/
//go:generate mockery -dir ../../../msp/ -name IdentityDeserializer -case underscore -output mocks/
// NewPluginValidator creates a new PluginValidator
func NewPluginValidator(pm PluginMapper, qec QueryExecutorCreator, deserializer msp.IdentityDeserializer, capabilities Capabilities) *PluginValidator {
return &PluginValidator{
capabilities: capabilities,
pluginChannelMapping: make(map[PluginName]*pluginsByChannel),
PluginMapper: pm,
QueryExecutorCreator: qec,
IdentityDeserializer: deserializer,
}
}
func (pv *PluginValidator) ValidateWithPlugin(ctx *Context) error {
plugin, err := pv.getOrCreatePlugin(ctx)
if err != nil {
return &validation.ExecutionFailureError{
Reason: fmt.Sprintf("plugin with name %s couldn't be used: %v", ctx.VSCCName, err),
}
}
err = plugin.Validate(ctx.Block, ctx.Namespace, ctx.Seq, 0, SerializedPolicy(ctx.Policy))
validityStatus := "valid"
if err != nil {
validityStatus = fmt.Sprintf("invalid: %v", err)
}
logger.Debug("Transaction", ctx.TxID, "appears to be", validityStatus)
return err
}
func (pv *PluginValidator) getOrCreatePlugin(ctx *Context) (validation.Plugin, error) {
pluginFactory := pv.PluginFactoryByName(PluginName(ctx.VSCCName))
if pluginFactory == nil {
return nil, errors.Errorf("plugin with name %s wasn't found", ctx.VSCCName)
}
pluginsByChannel := pv.getOrCreatePluginChannelMapping(PluginName(ctx.VSCCName), pluginFactory)
return pluginsByChannel.createPluginIfAbsent(ctx.Channel)
}
func (pv *PluginValidator) getOrCreatePluginChannelMapping(plugin PluginName, pf validation.PluginFactory) *pluginsByChannel {
pv.Lock()
defer pv.Unlock()
endorserChannelMapping, exists := pv.pluginChannelMapping[PluginName(plugin)]
if !exists {
endorserChannelMapping = &pluginsByChannel{
pluginFactory: pf,
channels2Plugins: make(map[string]validation.Plugin),
pv: pv,
}
pv.pluginChannelMapping[PluginName(plugin)] = endorserChannelMapping
}
return endorserChannelMapping
}
// PluginName defines the name of the plugin as it appears in the configuration
type PluginName string
type pluginsByChannel struct {
sync.RWMutex
pluginFactory validation.PluginFactory
channels2Plugins map[string]validation.Plugin
pv *PluginValidator
}
func (pbc *pluginsByChannel) createPluginIfAbsent(channel string) (validation.Plugin, error) {
pbc.RLock()
plugin, exists := pbc.channels2Plugins[channel]
pbc.RUnlock()
if exists {
return plugin, nil
}
pbc.Lock()
defer pbc.Unlock()
plugin, exists = pbc.channels2Plugins[channel]
if exists {
return plugin, nil
}
pluginInstance := pbc.pluginFactory.New()
plugin, err := pbc.initPlugin(pluginInstance, channel)
if err != nil {
return nil, err
}
pbc.channels2Plugins[channel] = plugin
return plugin, nil
}
func (pbc *pluginsByChannel) initPlugin(plugin validation.Plugin, channel string) (validation.Plugin, error) {
pe := &PolicyEvaluator{IdentityDeserializer: pbc.pv.IdentityDeserializer}
sf := &StateFetcherImpl{QueryExecutorCreator: pbc.pv}
if err := plugin.Init(pe, sf, pbc.pv.capabilities); err != nil {
return nil, errors.Wrap(err, "failed initializing plugin")
}
return plugin, nil
}
type PolicyEvaluator struct {
msp.IdentityDeserializer
}
// Evaluate takes a set of SignedData and evaluates whether this set of signatures satisfies the policy
func (id *PolicyEvaluator) Evaluate(policyBytes []byte, signatureSet []*common.SignedData) error {
pp := cauthdsl.NewPolicyProvider(id.IdentityDeserializer)
policy, _, err := pp.NewPolicy(policyBytes)
if err != nil {
return err
}
return policy.Evaluate(signatureSet)
}
// DeserializeIdentity unmarshals the given identity to msp.Identity
func (id *PolicyEvaluator) DeserializeIdentity(serializedIdentity []byte) (Identity, error) {
mspIdentity, err := id.IdentityDeserializer.DeserializeIdentity(serializedIdentity)
if err != nil {
return nil, err
}
return &identity{Identity: mspIdentity}, nil
}
type identity struct {
msp.Identity
}
func (i *identity) GetIdentityIdentifier() *IdentityIdentifier {
identifier := i.Identity.GetIdentifier()
return &IdentityIdentifier{
Id: identifier.Id,
Mspid: identifier.Mspid,
}
}
type StateFetcherImpl struct {
QueryExecutorCreator
}
func (sf *StateFetcherImpl) FetchState() (State, error) {
qe, err := sf.NewQueryExecutor()
if err != nil {
return nil, err
}
return &StateImpl{qe}, nil
}
type StateImpl struct {
ledger.QueryExecutor
}
func (s *StateImpl) GetStateRangeScanIterator(namespace string, startKey string, endKey string) (ResultsIterator, error) {
it, err := s.QueryExecutor.GetStateRangeScanIterator(namespace, startKey, endKey)
if err != nil {
return nil, err
}
return &ResultsIteratorImpl{ResultsIterator: it}, nil
}
type ResultsIteratorImpl struct {
ledger2.ResultsIterator
}
func (it *ResultsIteratorImpl) Next() (QueryResult, error) {
return it.Next()
}
// SerializedPolicy defines a marshaled policy
type SerializedPolicy []byte
// Bytes returns te bytes of the SerializedPolicy
func (sp SerializedPolicy) Bytes() []byte {
return sp
}