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dataservice.go
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dataservice.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 (
"encoding/json"
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/robertkrimen/otto"
)
// This is the object type used to form composite keys for the collection of collections.
const collectionObjectType = "$syscollections"
// DataService is a Go wrapper around an instance of the DataService JavaScript class.
type DataService struct {
This *otto.Object
Stub shim.ChaincodeStubInterface
}
// NewDataService creates a Go wrapper around a new instance of the DataService JavaScript class.
func NewDataService(vm *otto.Otto, context *Context, stub shim.ChaincodeStubInterface) (result *DataService) {
logger.Debug("Entering NewDataService", vm, context, stub)
defer func() { logger.Debug("Exiting NewDataService", result) }()
// Create a new instance of the JavaScript chaincode class.
temp, err := vm.Call("new composer.DataService", nil, context.This)
if err != nil {
panic(fmt.Sprintf("Failed to create new instance of DataService JavaScript class: %v", err))
} else if !temp.IsObject() {
panic("New instance of DataService JavaScript class is not an object")
}
object := temp.Object()
// Add a pointer to the Go object into the JavaScript object.
result = &DataService{This: temp.Object(), Stub: stub}
err = object.Set("$this", result)
if err != nil {
panic(fmt.Sprintf("Failed to store Go object in DataService JavaScript object: %v", err))
}
// Bind the methods into the JavaScript object.
result.This.Set("_createCollection", result.createCollection)
result.This.Set("_deleteCollection", result.deleteCollection)
result.This.Set("_getCollection", result.getCollection)
result.This.Set("_existsCollection", result.existsCollection)
return result
}
// createCollection creates a collection of objects in the world state.
func (dataService *DataService) createCollection(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataService.createCollection", call)
defer func() { logger.Debug("Exiting DataService.createCollection", result) }()
// Validate the arguments from JavaScript.
id, force, 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 !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"))
}
// Create the composite key.
// The collection is stored with a composite key of collection ID.
key, err := dataService.Stub.CreateCompositeKey(collectionObjectType, []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 collection already exists.
existingValue, err := dataService.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 collection with ID '%s' as the collection already exists", id)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
}
// Store the collection.
collection := map[string]interface{}{"id": id.String()}
value, err := json.Marshal(collection)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
err = dataService.Stub.PutState(key, value)
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
dataCollection := NewDataCollection(call.Otto, dataService, dataService.Stub, id.String())
_, err = callback.Call(callback, nil, dataCollection.This)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// deleteCollection deletes a collection of objects in the world state.
func (dataService *DataService) deleteCollection(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataService.deleteCollection", call)
defer func() { logger.Debug("Exiting DataService.deleteCollection", 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 collection is stored with a composite key of collection ID.
key, err := dataService.Stub.CreateCompositeKey(collectionObjectType, []string{id.String()})
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Remove all of the objects from the collection.
err = dataService.clearCollection(id.String())
if err != nil {
_, err = callback.Call(callback, call.Otto.MakeCustomError("Error", err.Error()))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// Delete the collection.
err = dataService.Stub.DelState(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)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// getCollection retrieves an existing collection from the world state.
func (dataService *DataService) getCollection(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataService.getCollection", call)
defer func() { logger.Debug("Exiting DataService.getCollection", 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 collection is stored with a composite key of collection ID.
key, err := dataService.Stub.CreateCompositeKey(collectionObjectType, []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 := dataService.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("Collection with ID '%s' does not exist", id)))
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
dataCollection := NewDataCollection(call.Otto, dataService, dataService.Stub, id.String())
_, err = callback.Call(callback, nil, dataCollection.This)
if err != nil {
panic(err)
}
return otto.UndefinedValue()
}
// existsCollection checks to see if a collection exists in the world state.
func (dataService *DataService) existsCollection(call otto.FunctionCall) (result otto.Value) {
logger.Debug("Entering DataService.existsCollection", call)
defer func() { logger.Debug("Exiting DataService.existsCollection", 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 collection is stored with a composite key of collection ID.
key, err := dataService.Stub.CreateCompositeKey(collectionObjectType, []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 := dataService.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()
}
// clearCollection is called to clear all objects from a collection.
func (dataService *DataService) clearCollection(collectionID string) (err error) {
logger.Debug("Entering DataService.clearCollection", collectionID)
defer func() { logger.Debug("Exiting DataService.clearCollection", err) }()
// We look for all objects in this collection by performing a partial query.
// The objects are stored with composite keys of collectionID + objectID.
iterator, err := dataService.Stub.GetStateByPartialCompositeKey(collectionID, []string{})
if err != nil {
return err
}
// Must close iterator to free resources.
defer iterator.Close()
// Iterate over all the keys returned by the partial query above.
for iterator.HasNext() {
// Read the current key.
key, _, err := iterator.Next()
if err != nil {
return err
}
// Delete the current key.
err = dataService.Stub.DelState(key)
if err != nil {
return err
}
}
return nil
}