ina260-zmq-publisher/src/client.c

//  Weather update client
//  Connects SUB socket to tcp://localhost:5556
//  Collects weather updates and finds avg temp in zipcode
#include <zmq.h>
#include <assert.h>
#include <time.h>
#include <string.h>

#include "utils.h"

int main (int argc, char *argv [])
{
  if(argc != 4){
    printf("Usage: %s <address> <port> <cdatadir>",argv[0]);
    exit(1);
  }

  //----- Arguments
  char *ip=argv[1];
  int port=atoi(argv[2]);
  char *cdatadir=argv[3];

  //----- Various inits
  mkdirp(cdatadir);

  //----- Init ZMQ
  void *context = zmq_ctx_new ();
  void *subscriber = zmq_socket (context, ZMQ_SUB);
  char bindto[30];
  sprintf(bindto,"tcp://%s:%d",ip,port);
  int rc = zmq_bind (subscriber, bindto);
  if(rc!=0){
    printf("Failed to bind zmq on %s\n",bindto);
    exit(1);
  }
  rc = zmq_setsockopt (subscriber, ZMQ_SUBSCRIBE,
                        ZMQ_TOKEN, strlen(ZMQ_TOKEN));

  //----- Listen
  char buffer[ZMQ_MSG_SIZE];
  int size;
  while(1){
    size=zmq_recv (subscriber, buffer, ZMQ_MSG_SIZE-1, 0);
    buffer[size < ZMQ_MSG_SIZE ? size : ZMQ_MSG_SIZE - 1] = '\0';
    //----- Read buffer
    char *token = strtok(buffer, "\n");
    char key[255];
    char client[255];
    long int interval;
    FILE *fptr;
    int line=1;
    while(token != NULL){
      if(line==2)
        strcpy(key,token);
      else if(line==3)
        strcpy(client,token);
      else if(line==4)
        interval=atoi(token);

      if(line==4){
        printf("Data received with key=%s\n",key);
        char path[255]="";
        sprintf(path,"%s/%s_%s_%ld",cdatadir,key,client,interval);
        fptr=fopen(path,"a");
      }

      if(line>4){
        fwrite(token, strlen(token), 1, fptr);
        fwrite("\n",2,1,fptr);
      }

      token=strtok(NULL, "\n");
      line++;
    }
    fclose(fptr);
  }



  zmq_close (subscriber);
  zmq_ctx_destroy (context);

  return 0;
}