SIGINT handler in cxx

#include <iostream>
#include <csignal>
#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif


using namespace std;

void signalHandler( int signum ) {
    cout << "Interrupt signal (" << signum << ") received.\n";

    // cleanup and close up stuff here
    // terminate program

    exit(signum);
}

int main () {
    // register signal SIGINT and signal handler
    signal(SIGINT, signalHandler);

    while(1) {
        cout << "Going to sleep...." << endl;
        sleep(1);
    }

    return 0;
}

Convert python dictionary to object

Consider having json response from REST service stored internally in dictionary object. Now, following code converts content of the dictionary to instace of class Test.

Keep in mind though it's just simple demonstration. Enhancement in form of data validation might be required!

from collections import namedtuple

class Test:
    def __init__(self, name : str, description : str, float_number : float): 
        self.name, self.descrition, self.float_number  = name, description, float_number

    def __repr__(self) -> str:
        return f"Test class data: name='{self.name}', description='{self.descrition}', number={self.float_number}"

paramDict = dict(name="Name Property Value", description="Description Property Value", float_number=102.0036)

tstInstance = Test(*(namedtuple('x', paramDict.keys())(*paramDict.values())))

print(repr(tstInstance))

Running the code above prints following representation of the object on the std output:

Test class data: name='Name Property Value', description='Description Property Value', number=102.0036

Create trustore and keystore for local Kafka and Zookeeper on Windows

Scenario:

1. Needed to use local Zookeeper and Kafka with existing CA certificate as well as existing consumer certificate. 
2. Hence needed to be able to use specific CN for 127.0.0.1, not a localhost
3. Modification of windows hosts file not allowed

All samples I found on the net presumed that CA needs to be generated. My use case was different. I was given with CA and client certificate and I needed to use defined certificate chain for authentication.

Used Git Bash i.e. cygwin for this exercise, hence winpty presence on line with openssl command.

 keytool -genkeypair -keyalg RSA -keysize 2048 -alias projenvlocal -dname "CN=projenvlocal" 
    -ext SAN=DNS:projenvlocal,DNS:localhost,IP:127.0.0.1 -validity 3650 -keystore server.keystore.jks 
    -storepass pwd1234 -keypass pwd1234 -deststoretype pkcs12  

 keytool -keystore server.truststore.jks -alias CARoot -import -file projEnvCALocal.crt 
    -storepass pwd1234 -noprompt

 keytool -keystore server.keystore.jks -alias projenvlocal -certreq -file localhost.csr 
    -storepass pwd1234  

 winpty openssl x509 -req -CA projEnvCALocal.crt -CAkey projEnvCALocal.key -in localhost.csr 
    -out localhost-signed.crt -days 3650 -CAcreateserial -extfile sign-cert.cnf 
    -extensions server_cert -passin pass:keypwd  

 keytool -keystore server.keystore.jks -alias CARoot -import -file projEnvCALocal.crt 
    -storepass pwd1234 -noprompt  

 keytool -keystore server.keystore.jks -alias projenvlocal -import -file localhost-signed.crt 
    -storepass pwd1234  

* passwords are just illustrative of full command line

This part below is the main thing for being able to use certificate's CN as user name for Kafka authentication on localhost/127.0.0.1

   -dname "CN=projenvlocal" -ext SAN=DNS:projenvlocal,DNS:localhost,IP:127.0.0.1

Performing of script above create two files, server.trustore.jks and server.keystore.jks .These files need to be used in ssl section of Kafka's server.properties and Zookeeper's zoo.cfg (file names may differ though).