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datacollection.go
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datacollection.go
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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
duktape "gopkg.in/olebedev/go-duktape.v3"
"github.com/hyperledger/fabric/core/chaincode/shim"
)
// DataCollection is a Go wrapper around an instance of the DataCollection JavaScript class.
type DataCollection struct {
VM *duktape.Context
Stub shim.ChaincodeStubInterface
CollectionID string
}
// NewDataCollection creates a Go wrapper around a new instance of the DataCollection JavaScript class.
func NewDataCollection(vm *duktape.Context, dataService *DataService, stub shim.ChaincodeStubInterface, collectionID string) (result *DataCollection) {
logger.Debug("Entering NewDataCollection", vm, dataService, &stub)
defer func() { logger.Debug("Exiting NewDataCollection", result) }()
// Ensure the JavaScript stack is reset.
defer vm.SetTop(vm.GetTop())
// Create the new data service.
result = &DataCollection{VM: vm, Stub: stub, CollectionID: collectionID}
// Get the data service.
vm.PushGlobalStash() // [ stash ]
vm.GetPropString(-1, "dataService") // [ stash theDataService ]
// Create a new instance of the JavaScript DataCollection class.
vm.PushGlobalObject() // [ stash theDataService global ]
vm.GetPropString(-1, "composer") // [ stash theDataService global composer ]
vm.GetPropString(-1, "DataCollection") // [ stash theDataService global composer DataCollection ]
vm.Dup(-4) // [ stash theDataService global composer DataCollection theDataService ]
err := vm.Pnew(1) // [ stash theDataService global composer theDataCollection ]
if err != nil {
panic(err)
}
// Store the data collection into the global stash.
vm.DupTop() // [ stash theDataService global composer theDataCollection theDataCollection ]
vm.PutPropString(-6, "dataCollection") // [ stash theDataService global composer theDataCollection ]
// Bind the methods into the JavaScript object.
vm.PushGoFunction(result.getAll) // [ stash theDataService global composer theDataCollection getAll ]
vm.PutPropString(-2, "_getAll") // [ stash theDataService global composer theDataCollection ]
vm.PushGoFunction(result.get) // [ stash theDataService global composer theDataCollection get ]
vm.PutPropString(-2, "_get") // [ stash theDataService global composer theDataCollection ]
vm.PushGoFunction(result.exists) // [ stash theDataService global composer theDataCollection exists ]
vm.PutPropString(-2, "_exists") // [ stash theDataService global composer theDataCollection ]
vm.PushGoFunction(result.add) // [ stash theDataService global composer theDataCollection add ]
vm.PutPropString(-2, "_add") // [ stash theDataService global composer theDataCollection ]
vm.PushGoFunction(result.update) // [ stash theDataService global composer theDataCollection update ]
vm.PutPropString(-2, "_update") // [ stash theDataService global composer theDataCollection ]
vm.PushGoFunction(result.remove) // [ stash theDataService global composer theDataCollection remove ]
vm.PutPropString(-2, "_remove") // [ stash theDataService global composer theDataCollection ]
// Return the new data collection.
return result
}
// getAll retreieves all of the objects in this collection from the world state.
func (dataCollection *DataCollection) getAll(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.getAll", vm)
defer func() { logger.Debug("Exiting DataCollection.getAll", result) }()
// Validate the arguments from JavaScript.
vm.RequireFunction(0)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
iterator, err := dataCollection.Stub.GetStateByPartialCompositeKey(dataCollection.CollectionID, []string{})
if err != nil {
vm.Dup(0)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Must close iterator to free resources.
defer iterator.Close()
// Iterate over all the keys returned by the partial query above.
arrIdx := vm.PushArray()
arrCount := uint(0)
for iterator.HasNext() {
// Read the current key and value.
_, value, err := iterator.Next()
// kv, err := iterator.Next()
if err != nil {
vm.Dup(0)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Parse the current value.
vm.PushString(string(value))
// vm.PushString(string(kv.Value))
vm.JsonDecode(-1)
vm.PutPropIndex(arrIdx, arrCount)
arrCount++
}
// Call the callback.
vm.Dup(0)
vm.PushNull()
vm.Dup(arrIdx)
vm.Pcall(2)
return 0
}
// get retrieves a specific object in this collection from the world state.
func (dataCollection *DataCollection) get(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.get", vm)
defer func() { logger.Debug("Exiting DataCollection.get", result) }()
// Validate the arguments from JavaScript.
id := vm.RequireString(0)
vm.RequireFunction(1)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id})
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Get the collection.
value, err := dataCollection.Stub.GetState(key)
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
} else if value == nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "Object with ID '%s' in collection with ID '%s' does not exist", []interface{}{id, dataCollection.CollectionID})
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Parse the current value.
vm.PushString(string(value))
vm.JsonDecode(-1)
// Call the callback.
vm.Dup(1)
vm.PushNull()
vm.Dup(-3)
if vm.Pcall(2) == duktape.ExecError {
panic(vm.ToString(-1))
}
return 0
}
// exists checks to see if an object exists in this collection in the world state.
func (dataCollection *DataCollection) exists(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.exists", vm)
defer func() { logger.Debug("Exiting DataCollection.exists", result) }()
// Validate the arguments from JavaScript.
id := vm.RequireString(0)
vm.RequireFunction(1)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id})
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Get the object.
value, err := dataCollection.Stub.GetState(key)
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Call the callback.
vm.Dup(1)
vm.PushNull()
vm.PushBoolean(value != nil)
if vm.Pcall(2) == duktape.ExecError {
panic(vm.ToString(-1))
}
return 0
}
// add adds an object to this collection in the world satte.
func (dataCollection *DataCollection) add(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.add", vm)
defer func() { logger.Debug("Exiting DataCollection.add", result) }()
// Validate the arguments from JavaScript.
id := vm.RequireString(0)
vm.RequireObjectCoercible(1)
force := vm.RequireBoolean(2)
vm.RequireFunction(3)
// Serialize the object.
vm.Dup(1)
vm.JsonEncode(-1)
value := vm.RequireString(-1)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id})
if err != nil {
vm.Dup(3)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
if !force {
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
vm.Dup(3)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
} else if existingValue != nil {
vm.Dup(3)
vm.PushErrorObject(duktape.ErrError, "Failed to add object with ID '%s' as the object already exists", id)
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
}
// Store the object in the collection.
err = dataCollection.Stub.PutState(key, []byte(value))
if err != nil {
vm.Dup(2)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Call the callback.
vm.Dup(3)
vm.PushNull()
if vm.Pcall(1) == duktape.ExecError {
panic(vm.ToString(-1))
}
return 0
}
// update updates an existing object in this collection in the world state.
func (dataCollection *DataCollection) update(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.update", vm)
defer func() { logger.Debug("Exiting DataCollection.update", result) }()
// Validate the arguments from JavaScript.
id := vm.RequireString(0)
vm.RequireObjectCoercible(1)
vm.RequireFunction(2)
// Serialize the object.
vm.Dup(1)
vm.JsonEncode(-1)
value := vm.RequireString(-1)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id})
if err != nil {
vm.Dup(2)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
vm.Dup(2)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
} else if existingValue == nil {
vm.Dup(2)
vm.PushErrorObject(duktape.ErrError, "Failed to update object with ID '%s' as the object does not exist", id)
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Store the object in the collection.
err = dataCollection.Stub.PutState(key, []byte(value))
if err != nil {
vm.Dup(2)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Call the callback.
vm.Dup(2)
vm.PushNull()
if vm.Pcall(1) == duktape.ExecError {
panic(vm.ToString(-1))
}
return 0
}
// remove removes an object from this collection in the world state.
func (dataCollection *DataCollection) remove(vm *duktape.Context) (result int) {
logger.Debug("Entering DataCollection.remove", vm)
defer func() { logger.Debug("Exiting DataCollection.remove", result) }()
// Validate the arguments from JavaScript.
id := vm.RequireString(0)
vm.RequireFunction(1)
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id})
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
} else if existingValue == nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "Failed to delete object with ID '%s' as the object does not exist", id)
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Remove the object from the collection.
err = dataCollection.Stub.DelState(key)
if err != nil {
vm.Dup(1)
vm.PushErrorObject(duktape.ErrError, "%s", err.Error())
if vm.Pcall(1) == duktape.ExecError {
panic(err)
}
return 0
}
// Call the callback.
vm.Dup(1)
vm.PushNull()
if vm.Pcall(1) == duktape.ExecError {
panic(vm.ToString(-1))
}
return 0
}