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my-classes on 04/26/14

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My-Classes.com: Combining ZeroMQ and NanoMsg for Serving Web-requests

/ Published in: C++

A pretty simple example, that always replies 'Hello World!!' to the browser. The raw ROUTER socket is listening on tcp port 8080, so any browser that sends a request on port 8080 of localhost, will get back the response. The internal NanoMsg communication is happening on inproc channel. A dedicated thread is created for the NanoMsg worker socket (REP) that serves the responses. You can experiment with creating multiple nanoMsg worker threads and stress testing it.

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#include "czmq.h"
#include "nn.h"
#include "reqrep.h"

#define WORKER_SOCKET_ADDRESS "inproc://test"

void* nano_worker(void* args)
{
	int rc;
	int workerSock;
	char request[4096];
	char response[] = "HTTP / 1.0 200 OK\r\nContent - Type: text / plain\r\n\r\nHello World!!";
	int nResponseLen = strlen(response);

workerSock = nn_socket(AF_SP, NN_REP);
	assert(workerSock >= 0);
	nn_bind(workerSock, WORKER_SOCKET_ADDRESS);
	int i = 0;
	while (1)
	{
		rc = nn_recv(workerSock, request, sizeof (request), 0);
		assert(rc >= 0);

rc = nn_send(workerSock, response, nResponseLen+1, 0);
		assert(rc >= 0);
	}
}

int main(void)
{
	zctx_t *ctx = zctx_new();
	void *router = zsocket_new(ctx, ZMQ_ROUTER);
	zsocket_set_router_raw(router, 1);
	zsocket_set_sndhwm(router, 0);
	zsocket_set_rcvhwm(router, 0);
	int rc = zsocket_bind(router, "tcp://*:8080");
	assert(rc != -1);

zthread_new(nano_worker, NULL);

int sock = nn_socket(AF_SP, NN_REQ);
	assert(sock >= 0);
	assert(nn_connect(sock, WORKER_SOCKET_ADDRESS) >= 0);

while (true) 
	{
		//  Get HTTP request
		zframe_t *identity = zframe_recv(router);
		if (!identity) break;          //  Ctrl-C interrupt
		char *request = zstr_recv(router);
		{
			// forward the http-request to NanoMsg 
			int bytes = nn_send(sock, request, strlen(request), 0);
			assert(bytes >= 0);
		}
		free(request);     // free the memory

// read the response from NanoMsg worker
		char* response = NULL;
		int bytes = nn_recv(sock, &response, NN_MSG, 0);
		assert(bytes >= 0);
		{
			//  Send response to client/browser
			zframe_send(&identity, router, ZFRAME_MORE + ZFRAME_REUSE);
			zstr_send(router, response);

//  Close connection to browser
			zframe_send(&identity, router, ZFRAME_MORE);
			zmq_send(router, NULL, 0, 0);
		}
		nn_freemsg(response); // free the memory
	}
	zctx_destroy(&ctx);
	return 0;
}

URL: http://my-classes.com/2014/04/26/combining-zeromq-and-nanomsg-for-serving-web-requests/

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