pulsar-client-cpp Documentation

The Pulsar C++ client

Welcome to the Doxygen documentation for Pulsar.

Supported platforms

The Pulsar C++ client has been successfully tested on MacOS and Linux.

System requirements

You need to have the following installed to use the C++ client:

• CMake
• Boost
• Protocol Buffers 2.6
• Log4CXX
• libcurl
• Google Test
• JsonCpp

Compilation

There are separate compilation instructions for MacOS and Linux. For both systems, start by cloning the Pulsar repository:

$ git clone https://github.com/apache/pulsar

Linux

First, install all of the necessary dependencies:

$ apt-get install cmake libssl-dev libcurl4-openssl-dev liblog4cxx-dev \
  libprotobuf-dev libboost-all-dev libgtest-dev libjsoncpp-dev

Then compile and install Google Test:

$ git clone https://github.com/google/googletest.git && cd googletest
$ sudo cmake .
$ sudo make
$ sudo cp *.a /usr/lib

Finally, compile the Pulsar client library for C++ inside the Pulsar repo:

$ cd pulsar-client-cpp
$ cmake .
$ make

The resulting files, libpulsar.so and libpulsar.a, will be placed in the lib folder of the repo while two tools, perfProducer and perfConsumer, will be placed in the perf directory.

MacOS

First, install all of the necessary dependencies:

# OpenSSL installation
$ brew install openssl
$ export OPENSSL_INCLUDE_DIR=/usr/local/opt/openssl/include/
$ export OPENSSL_ROOT_DIR=/usr/local/opt/openssl/

# Protocol Buffers installation
$ brew tap homebrew/versions
$ brew install protobuf260
$ brew install boost
$ brew install log4cxx

# Google Test installation
$ git clone https://github.com/google/googletest.git
$ cd googletest
$ cmake .
$ make install

Then compile the Pulsar client library in the repo that you cloned:

$ cd pulsar-client-cpp
$ cmake .
$ make

Consumer

Client client("pulsar://localhost:6650");

Consumer consumer;
Result result = client.subscribe("persistent://sample/standalone/ns1/my-topic", "my-subscribtion-name", consumer);
if (result != ResultOk) {
    LOG_ERROR("Failed to subscribe: " << result);
    return -1;
}

Message msg;

while (true) {
    consumer.receive(msg);
    LOG_INFO("Received: " << msg << "  with payload '" << msg.getDataAsString() << "'");

    consumer.acknowledge(msg);
}

client.close();

Producer

Client client("pulsar://localhost:6650");

Producer producer;
Result result = client.createProducer("persistent://sample/standalone/ns1/my-topic", producer);
if (result != ResultOk) {
    LOG_ERROR("Error creating producer: " << result);
    return -1;
}

// Publish 10 messages to the topic
for(int i=0;i<10;i++){
    Message msg = MessageBuilder().setContent("my-message").build();
    Result res = producer.send(msg);
    LOG_INFO("Message sent: " << res);
}
client.close();

Authentication

ClientConfiguration config = ClientConfiguration();
config.setUseTls(true);
std::string certfile = "/path/to/cacert.pem";

ParamMap params;
params["tlsCertFile"] = "/path/to/client-cert.pem";
params["tlsKeyFile"]  = "/path/to/client-key.pem";
config.setTlsTrustCertsFilePath(certfile);
config.setTlsAllowInsecureConnection(false);
AuthenticationPtr auth = pulsar::AuthFactory::create("/path/to/libauthtls.so", params);
config.setAuth(auth);

Client client("pulsar+ssl://my-broker.com:6651",config);

Code formatting

After you changed code, run auto-formatting by the following command.

make format

You need to have the following installed to use the auto-formatting.

• clang-format 5.0