Nacos-sdk-cpp for c++ clients allow users to access Nacos service, it supports service discovery and dynamic configuration.
Download the source and run the following command in bash:
cd nacos-sdk-cpp
make
a libnacos-cli.so and a nacos-cli.out will be generated
run ./nacos-cli.out to perform test on the library
Note: You need to run a nacos server on your local machine listening on port 8848 to go through the whole test One of the testcases will test endpoint functionality, so you also need to run a simple http server on port 80 which provides the following content:
127.0.0.1:8848
on path /endpoints/endpoint0
Here is an example showing how to integrate the library(.so) into your project:
Create a file named IntegratingIntoYourProject.cpp:
#include <iostream>
#include "factory/NacosServiceFactory.h"
#include "PropertyKeyConst.h"
#include "DebugAssertion.h"
#include "ResourceGuard.h"
#include "Debug.h"
#include "NacosString.h"
using namespace std;
using namespace nacos;
int main() {
Properties props;
props[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1:8848";//Server address
NacosServiceFactory *factory = new NacosServiceFactory(props);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
ConfigService *n = factory->CreateConfigService();
ResourceGuard <ConfigService> _serviceFactory(n);
NacosString ss = "";
try {
ss = n->getConfig("k", NULLSTR, 1000);
}
catch (NacosException &e) {
cout <<
"Request failed with curl code:" << e.errorcode() << endl <<
"Reason:" << e.what() << endl;
return -1;
}
cout << ss << endl;
return 0;
}
g++ IntegratingIntoYourProject.cpp -L. -lnacos-cli -Iinclude -o integrated.out
Start a nacos on your localmachine listening on port 8848, and run ./integrated.out
Then you'll see:
SuccessfullyIntegrated
You may come across the following problem:
error while loading shared libraries: libnacos-cli.so: cannot open shared object file: No such file or directory
solution:
assume that your libnacos-cli.so resides in /usr/local/libnacos/
export LD_LIBRARY_PATH=/usr/local/libnacos/ (DON'T include the so file's name)
or you can use ldconfig to add libnacos-cli.so to your lib path.
#include <iostream>
#include "factory/NacosServiceFactory.h"
#include "PropertyKeyConst.h"
#include "DebugAssertion.h"
#include "ResourceGuard.h"
#include "Debug.h"
using namespace std;
using namespace nacos;
int main() {
Properties props;
props[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1:8848";//Server address
NacosServiceFactory *factory = new NacosServiceFactory(props);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
ConfigService *n = factory->CreateConfigService();
ResourceGuard <ConfigService> _serviceFactory(n);
NacosString ss = "";
try {
ss = n->getConfig("k", NULLSTR, 1000);
}
catch (NacosException &e) {
cout <<
"Request failed with curl code:" << e.errorcode() << endl <<
"Reason:" << e.what() << endl;
return -1;
}
cout << ss << endl;
return 0;
}#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include "factory/NacosServiceFactory.h"
#include "ResourceGuard.h"
#include "PropertyKeyConst.h"
#include "DebugAssertion.h"
#include "Debug.h"
using namespace std;
using namespace nacos;
int main() {
Properties props;
props[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1:8848";//server address
NacosServiceFactory *factory = new NacosServiceFactory(props);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
ConfigService *n = factory->CreateConfigService();
ResourceGuard <ConfigService> _serviceFactory(n);
bool bSucc = false;
NacosString ss = "";
try {
bSucc = n->publishConfig("Cfg_key", NULLSTR, "Cfg_val");
int retry = 0;
ss = n->getConfig("Cfg_key", NULLSTR, 1000);
while (!(ss == "Cfg_val") && retry++ < 10) {
ss = n->getConfig("Cfg_key", NULLSTR, 1000);
}
if (!(ss == "Cfg_val")) {
throw NacosException(0, "getConfig() failed.");
}
}
catch (NacosException &e) {
cout <<
"Request failed with curl code:" << e.errorcode() << endl <<
"Reason:" << e.what() << endl;
return -1;
}
cout << "Publishing Key:Cfg_key with value:Cfg_val result:" << bSucc << endl;
return 0;
}#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include "factory/NacosServiceFactory.h"
#include "ResourceGuard.h"
#include "listen/Listener.h"
#include "PropertyKeyConst.h"
#include "DebugAssertion.h"
#include "Debug.h"
using namespace std;
using namespace nacos;
class MyListener : public Listener {
private:
int num;
public:
MyListener(int num) {
this->num = num;
}
void receiveConfigInfo(const NacosString &configInfo) {
cout << "===================================" << endl;
cout << "Watcher" << num << endl;
cout << "Watched Key UPDATED:" << configInfo << endl;
cout << "===================================" << endl;
}
};
int main() {
Properties props;
props[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1:8848";
NacosServiceFactory *factory = new NacosServiceFactory(props);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
ConfigService *n = factory->CreateConfigService();
ResourceGuard <ConfigService> _serviceFactory(n);
MyListener *theListener = new MyListener(1);//You don't need to free it, since it will be deleted by the function removeListener
n->addListener("dqid", NULLSTR, theListener);//All changes on the key dqid will be received by MyListener
cout << "Input a character to continue" << endl;
getchar();
cout << "remove listener" << endl;
n->removeListener("dqid", NULLSTR, theListener);//Cancel listening
getchar();
return 0;
}#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include "naming/NamingProxy.h"
#include "naming/NacosNamingService.h"
#include "factory/NacosServiceFactory.h"
#include "ResourceGuard.h"
#include "naming/Instance.h"
#include "Constants.h"
#include "utils/UtilAndComs.h"
#include "http/HTTPCli.h"
#include "DebugAssertion.h"
#include "Debug.h"
#include "NacosString.h"
#include "Properties.h"
#include "PropertyKeyConst.h"
using namespace std;
using namespace nacos;
int main() {
Properties configProps;
configProps[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1";
NacosServiceFactory *factory = new NacosServiceFactory(configProps);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
NamingService *namingSvc = factory->CreateNamingService();
ResourceGuard <NamingService> _serviceFactory(namingSvc);
Instance instance;
instance.clusterName = "DefaultCluster";
instance.ip = "127.0.0.1";
instance.port = 2333;
instance.instanceId = "1";
instance.ephemeral = true;
//Registers 5 services named TestNamingService1...5
try {
for (int i = 0; i < 5; i++) {
NacosString serviceName = "TestNamingService" + NacosStringOps::valueOf(i);
instance.port = 2000 + i;
namingSvc->registerInstance(serviceName, instance);
}
}
catch (NacosException &e) {
cout << "encounter exception while registering service instance, raison:" << e.what() << endl;
return -1;
}
sleep(30);
try {
for (int i = 0; i < 5; i++) {
NacosString serviceName = "TestNamingService" + NacosStringOps::valueOf(i);
namingSvc->deregisterInstance(serviceName, "127.0.0.1", 2000 + i);
sleep(1);
}
}
catch (NacosException &e) {
cout << "encounter exception while registering service instance, raison:" << e.what() << endl;
return -1;
}
sleep(30);
return 0;
}#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include "factory/NacosServiceFactory.h"
#include "ResourceGuard.h"
#include "naming/subscribe/EventListener.h"
#include "PropertyKeyConst.h"
#include "DebugAssertion.h"
#include "Debug.h"
using namespace std;
using namespace nacos;
class MyServiceListener : public EventListener {
private:
int num;
public:
MyServiceListener(int num) {
this->num = num;
}
void receiveNamingInfo(const ServiceInfo &serviceInfo){
cout << "===================================" << endl;
cout << "Watcher: " << num << endl;
cout << "Watched service UPDATED: " << serviceInfo.toInstanceString() << endl;
cout << "===================================" << endl;
}
};
int main() {
Properties props;
props[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1:8848";
//Interval for poller to check the status of subscribed services(unit:Ms), 30000 by default
//Here we set it to 5000 to see the output more quick
props[PropertyKeyConst::TCP_NAMING_POLL_INTERVAL] = "5000";
NacosServiceFactory *factory = new NacosServiceFactory(props);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
NamingService *n = factory->CreateNamingService();
ResourceGuard <NamingService> _serviceFactory(n);
n->subscribe("ss", new MyServiceListener(1));
cout << "Press any key to register services" << endl;
getchar();
n->registerInstance("ss", "127.0.0.1", 33);
n->registerInstance("ss", "127.0.0.1", 34);
cout << "Press any key to deregister services" << endl;
getchar();
n->deregisterInstance("ss", "127.0.0.1", 33);
n->deregisterInstance("ss", "127.0.0.1", 34);
cout << "All instances Unregistered, press any key to finish testing" << endl;
getchar();
return 0;
}#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include <list>
#include "naming/NamingProxy.h"
#include "factory/NacosServiceFactory.h"
#include "naming/Instance.h"
#include "Constants.h"
#include "utils/UtilAndComs.h"
#include "http/HTTPCli.h"
#include "DebugAssertion.h"
#include "Debug.h"
#include "NacosString.h"
#include "Properties.h"
#include "PropertyKeyConst.h"
#include "ResourceGuard.h"
using namespace std;
using namespace nacos;
int main() {
Properties configProps;
configProps[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1";
NacosServiceFactory *factory = new NacosServiceFactory(configProps);
ResourceGuard <NacosServiceFactory> _guardFactory(factory);
NamingService *namingSvc = factory->CreateNamingService();
ResourceGuard <NamingService> _guardService(namingSvc);
list <Instance> instances = namingSvc->getAllInstances("TestNamingService1");
cout << "getAllInstances from server:" << endl;
for (list<Instance>::iterator it = instances.begin();
it != instances.end(); it++) {
cout << "Instance:" << it->toString() << endl;
}
return 0;
}If your Nacos server is secured with password, you can add the following snippet to any of the examples above to enable authentication:
using namespace nacos;
......
configProps[PropertyKeyConst::SERVER_ADDR] = "127.0.0.1";
configProps[PropertyKeyConst::AUTH_USERNAME] = "username";
configProps[PropertyKeyConst::AUTH_PASSWORD] = "password";
NacosServiceFactory *factory = new NacosServiceFactory(configProps);
ConfigService *n = factory->CreateConfigService();
NamingService *namingSvc = factory->CreateNamingService();
......Nacos (official site: http://nacos.io) is an easy-to-use platform designed for dynamic service discovery and configuration and service management. It helps you to build cloud native applications and microservices platform easily.
Service is a first-class citizen in Nacos. Nacos supports almost all type of services, for example: Dubbo/gRPC service, Spring Cloud RESTFul service and Kubernetes service.