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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 (
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/robertkrimen/otto"
)
// DataCollection is a Go wrapper around an instance of the DataCollection JavaScript class.
type DataCollection struct {
This *otto.Object
Stub shim.ChaincodeStubInterface
CollectionID string
}
// NewDataCollection creates a Go wrapper around a new instance of the DataCollection JavaScript class.
func NewDataCollection(vm *otto.Otto, dataService *DataService, stub shim.ChaincodeStubInterface, collectionID string) (result *DataCollection) {
logger.Debug("Entering NewDataCollection", vm, dataService, stub)
defer func() { logger.Debug("Exiting NewDataCollection", result) }()
// Create a new instance of the JavaScript chaincode class.
temp, err := vm.Call("new composer.DataCollection", nil, dataService.This)
if err != nil {
panic(fmt.Sprintf("Failed to create new instance of DataCollection JavaScript class: %v", err))
} else if !temp.IsObject() {
panic("New instance of DataCollection JavaScript class is not an object")
}
object := temp.Object()
// Add a pointer to the Go object into the JavaScript object.
result = &DataCollection{This: temp.Object(), Stub: stub, CollectionID: collectionID}
err = object.Set("$this", result)
if err != nil {
panic(fmt.Sprintf("Failed to store Go object in DataCollection JavaScript object: %v", err))
}
// Bind the methods into the JavaScript object.
result.This.Set("_getAll", result.getAll)
result.This.Set("_get", result.get)
result.This.Set("_exists", result.exists)
result.This.Set("_add", result.add)
result.This.Set("_update", result.update)
result.This.Set("_remove", result.remove)
return result
}
// getAll retreieves all of the objects in this collection from the world state.
func (dataCollection *DataCollection) getAll(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.getAll", call)
defer func() { logger.Debug("Exiting DataCollection.getAll", result) }()
// Validate the arguments from JavaScript.
callback := call.Argument(0)
if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
}
// 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 {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Must close iterator to free resources.
defer iterator.Close()
// Iterate over all the keys returned by the partial query above.
objects := []interface{}{}
for iterator.HasNext() {
// Read the current key and value.
_, value, err := iterator.Next()
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Parse the current value.
object, err := call.Otto.Call("JSON.parse", nil, string(value))
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
objects = append(objects, object)
}
_, err = callback.Call(callback, nil, objects)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// get retrieves a specific object in this collection from the world state.
func (dataCollection *DataCollection) get(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.get", call)
defer func() { logger.Debug("Exiting DataCollection.get", result) }()
// Validate the arguments from JavaScript.
id, callback := call.Argument(0), call.Argument(1)
if !id.IsString() {
panic(fmt.Errorf("id not specified or is not a string"))
} else if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
}
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Get the collection.
value, err := dataCollection.Stub.GetState(key)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
} else if value == nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", fmt.Sprintf("Object with ID '%s' in collection with ID '%s' does not exist", id, dataCollection.CollectionID)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Parse the current value.
object, err := call.Otto.Call("JSON.parse", nil, string(value))
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
_, err = callback.Call(callback, nil, object)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// exists checks to see if an object exists in this collection in the world state.
func (dataCollection *DataCollection) exists(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.exists", call)
defer func() { logger.Debug("Exiting DataCollection.exists", result) }()
// Validate the arguments from JavaScript.
id, callback := call.Argument(0), call.Argument(1)
if !id.IsString() {
panic(fmt.Errorf("id not specified or is not a string"))
} else if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
}
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Get the object.
value, err := dataCollection.Stub.GetState(key)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
_, err = callback.Call(callback, nil, value != nil)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// add adds an object to this collection in the world satte.
func (dataCollection *DataCollection) add(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.add", call)
defer func() { logger.Debug("Exiting DataCollection.add", result) }()
// Validate the arguments from JavaScript.
id, object, force, callback := call.Argument(0), call.Argument(1), call.Argument(2), call.Argument(3)
if !id.IsString() {
panic(fmt.Errorf("id not specified or is not a string"))
} else if !object.IsObject() {
panic(fmt.Errorf("object not specified or is not a string"))
} else if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
} else if !force.IsBoolean() {
panic(fmt.Errorf("force not specified or is not a boolean"))
}
// Serialize the object.
value, err := call.Otto.Call("JSON.stringify", nil, object)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
forceVal, err := force.ToBoolean()
if !forceVal {
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
} else if existingValue != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", fmt.Sprintf("Failed to add object with ID '%s' as the object already exists", id)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
}
// Store the object in the collection.
err = dataCollection.Stub.PutState(key, []byte(value.String()))
_, err = callback.Call(callback, nil)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// update updates an existing object in this collection in the world state.
func (dataCollection *DataCollection) update(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.update", call)
defer func() { logger.Debug("Exiting DataCollection.update", result) }()
// Validate the arguments from JavaScript.
id, object, callback := call.Argument(0), call.Argument(1), call.Argument(2)
if !id.IsString() {
panic(fmt.Errorf("id not specified or is not a string"))
} else if !object.IsObject() {
panic(fmt.Errorf("object not specified or is not a string"))
} else if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
}
// Serialize the object.
value, err := call.Otto.Call("JSON.stringify", nil, object)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
} else if existingValue == nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", fmt.Sprintf("Failed to update object with ID '%s' as the object does not exist", id)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Store the object in the collection.
err = dataCollection.Stub.PutState(key, []byte(value.String()))
_, err = callback.Call(callback, nil)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// remove removes an object from this collection in the world state.
func (dataCollection *DataCollection) remove(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataCollection.remove", call)
defer func() { logger.Debug("Exiting DataCollection.remove", result) }()
// Validate the arguments from JavaScript.
id, callback := call.Argument(0), call.Argument(1)
if !id.IsString() {
panic(fmt.Errorf("id not specified or is not a string"))
} else if !callback.IsFunction() {
panic(fmt.Errorf("callback not specified or is not a string"))
}
// Create the composite key.
// The objects are stored with composite keys of collectionID + objectID.
key, err := dataCollection.Stub.CreateCompositeKey(dataCollection.CollectionID, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Check to see if the object already exists.
existingValue, err := dataCollection.Stub.GetState(key)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
} else if existingValue == nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", fmt.Sprintf("Failed to delete object with ID '%s' as the object does not exist", id)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Store the object in the collection.
err = dataCollection.Stub.DelState(key)
_, err = callback.Call(callback, nil)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}