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Hyperledger Fabric Java Chaincode Shim
/*
* Copyright 2019 IBM All Rights Reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.contract.routing.impl;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.hyperledger.fabric.Logger;
import org.hyperledger.fabric.contract.ContractInterface;
import org.hyperledger.fabric.contract.ContractRuntimeException;
import org.hyperledger.fabric.contract.annotation.Contract;
import org.hyperledger.fabric.contract.annotation.DataType;
import org.hyperledger.fabric.contract.annotation.Transaction;
import org.hyperledger.fabric.contract.execution.InvocationRequest;
import org.hyperledger.fabric.contract.routing.ContractDefinition;
import org.hyperledger.fabric.contract.routing.RoutingRegistry;
import org.hyperledger.fabric.contract.routing.TxFunction;
import org.hyperledger.fabric.contract.routing.TypeRegistry;
import io.github.classgraph.ClassGraph;
import io.github.classgraph.ClassInfo;
import io.github.classgraph.ScanResult;
/**
* Registry to hold permit access to the routing definitions. This is the
* primary internal data structure to permit access to information about the
* contracts, and their transaction functions.
*
* Contracts are added, and processed. At runtime, this can then be accessed to
* locate a specific 'Route' that can be handed off to the ExecutionService
*
*/
public final class RoutingRegistryImpl implements RoutingRegistry {
private static Logger logger = Logger.getLogger(RoutingRegistryImpl.class);
private final Map contracts = new HashMap<>();
/*
* (non-Javadoc)
*
* @see
* org.hyperledger.fabric.contract.routing.RoutingRegistry#addNewContract(java.
* lang.Class)
*/
@Override
public ContractDefinition addNewContract(final Class clz) {
logger.debug(() -> "Adding new Contract Class " + clz.getCanonicalName());
ContractDefinition contract;
contract = new ContractDefinitionImpl(clz);
// index this by the full qualified name
contracts.put(contract.getName(), contract);
if (contract.isDefault()) {
contracts.put(InvocationRequest.DEFAULT_NAMESPACE, contract);
}
logger.debug(() -> "Put new contract in under name " + contract.getName());
return contract;
}
/*
* (non-Javadoc)
*
* @see
* org.hyperledger.fabric.contract.routing.RoutingRegistry#containsRoute(org.
* hyperledger.fabric.contract.execution.InvocationRequest)
*/
@Override
public boolean containsRoute(final InvocationRequest request) {
if (contracts.containsKey(request.getNamespace())) {
final ContractDefinition cd = contracts.get(request.getNamespace());
if (cd.hasTxFunction(request.getMethod())) {
return true;
}
}
return false;
}
/*
* (non-Javadoc)
*
* @see org.hyperledger.fabric.contract.routing.RoutingRegistry#getRoute(org.
* hyperledger.fabric.contract.execution.InvocationRequest)
*/
@Override
public TxFunction.Routing getRoute(final InvocationRequest request) {
final TxFunction txFunction = contracts.get(request.getNamespace()).getTxFunction(request.getMethod());
return txFunction.getRouting();
}
@Override
public TxFunction getTxFn(final InvocationRequest request) {
final TxFunction txFunction = contracts.get(request.getNamespace()).getTxFunction(request.getMethod());
return txFunction;
}
/*
* (non-Javadoc)
*
* @see
* org.hyperledger.fabric.contract.routing.RoutingRegistry#getContract(java.lang
* .String)
*/
@Override
public ContractDefinition getContract(final String namespace) {
final ContractDefinition contract = contracts.get(namespace);
if (contract == null) {
throw new ContractRuntimeException("Undefined contract called");
}
return contract;
}
/*
* (non-Javadoc)
*
* @see
* org.hyperledger.fabric.contract.routing.RoutingRegistry#getAllDefinitions()
*/
@Override
public Collection getAllDefinitions() {
return contracts.values();
}
/*
* (non-Javadoc)
*
* @see
* org.hyperledger.fabric.contract.routing.RoutingRegistry#findAndSetContracts()
*/
@Override
@SuppressWarnings("unchecked")
public void findAndSetContracts(final TypeRegistry typeRegistry) {
// Find all classes that are valid contract or data type instances.
final ClassGraph classGraph = new ClassGraph()
.enableClassInfo()
.enableAnnotationInfo();
final List> contractClasses = new ArrayList<>();
final List> dataTypeClasses = new ArrayList<>();
try (ScanResult scanResult = classGraph.scan()) {
for (final ClassInfo classInfo : scanResult.getClassesWithAnnotation(Contract.class.getCanonicalName())) {
logger.debug("Found class with contract annotation: " + classInfo.getName());
try {
final Class contractClass = classInfo.loadClass();
logger.debug("Loaded class");
final Contract annotation = contractClass.getAnnotation(Contract.class);
if (annotation == null) {
// Since we check by name above, it makes sense to check it's actually
// compatible,
// and not some random class with the same name.
logger.debug("Class does not have compatible contract annotation");
} else if (!ContractInterface.class.isAssignableFrom(contractClass)) {
logger.debug("Class is not assignable from ContractInterface");
} else {
logger.debug("Class is assignable from ContractInterface");
contractClasses.add((Class) contractClass);
}
} catch (final IllegalArgumentException e) {
logger.debug("Failed to load class: " + e);
}
}
for (final ClassInfo classInfo : scanResult.getClassesWithAnnotation(DataType.class.getCanonicalName())) {
logger.debug("Found class with data type annotation: " + classInfo.getName());
try {
final Class dataTypeClass = classInfo.loadClass();
logger.debug("Loaded class");
final DataType annotation = dataTypeClass.getAnnotation(DataType.class);
if (annotation == null) {
// Since we check by name above, it makes sense to check it's actually
// compatible,
// and not some random class with the same name.
logger.debug("Class does not have compatible data type annotation");
} else {
logger.debug("Class has compatible data type annotation");
dataTypeClasses.add(dataTypeClass);
}
} catch (final IllegalArgumentException e) {
logger.debug("Failed to load class: " + e);
}
}
}
// store the contracts in the internal data structures
addContracts(contractClasses);
// now need to look for the data types have been set with the
dataTypeClasses.forEach(typeRegistry::addDataType);
}
private void addContracts(final List> contractClasses) {
// set to ensure that we don't scan the same class twice
final Set seenClass = new HashSet<>();
// loop over all the classes that have the Contract annotation
for (final Class contractClass : contractClasses) {
final String className = contractClass.getCanonicalName();
if (!seenClass.contains(className)) {
final ContractDefinition contract = addNewContract(contractClass);
logger.debug("Searching annotated methods");
for (final Method m : contractClass.getMethods()) {
if (m.getAnnotation(Transaction.class) != null) {
logger.debug("Found annotated method " + m.getName());
contract.addTxFunction(m);
}
}
seenClass.add(className);
}
}
}
}