Golf has an extended mode that allows using C code directly. Normally, this is not allowed, but if you use the extended-mode directive in your .golf file, you will be able to call C code from it.
In extended mode, Golf acts as a web framework for the C programming language, allowing greater flexibility in developing web applications based on this language.
Below, we present an example of how to use Golf as a web framework for C, creating a simple application that calculates the factorial of a number and exposes this functionality through a web application.
To create the application, we first generate the necessary file structure:
mkdir -p c-for-web
cd c-for-web
Next, we create a new application in Golf:
gg -k fact
Then, we save the following code in a file called calc-fact.golf. This file defines the web service that will interact with clients and call the C function:
extended-mode
%% /calc-fact public
get-param par
string-number par to num
set-number result
call-extended factorial(num, &result)
@Factorial of <<p-out par>> is <<p-num result>>
%%
Next, we create a factorial.c file with the implementation of the C function:
#include 'golf.h'
void factorial(gg_num f, gg_num *res) {
*res = 1;
gg_num i;
for (i = 2; i <= f; i++) {
*res *= i;
}
}
We also add a factorial.h file to declare the function used in the Golf code:
void factorial(gg_num f, gg_num *res);
To compile and run the server we use:
gg -q
We start the server with:
mgrg fact
We can test the application from the command line:
gg -r --req=/calc-fact/par=12 --exec --service
This returns:
Factorial of 12 is 479001600
To test it in a web browser, we configure Nginx by adding the following line in the configuration file:
location /fact/ { include /etc/nginx/fastcgi_params; fastcgi_pass unix:///var/lib/gg/fact/sock/sock; }
We restart Nginx to apply the changes:
sudo systemctl restart nginx
Accessing the URL:
https://127.0.0.1/fact/calc-fact/par=8
The result will be:
Factorial of 8 is 40320
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