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dbServer.cpp
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dbServer.cpp
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#include <strings.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fstream>
#include <iostream>
#include <string.h>
#include <sstream>
#define dbPort 23543
#define mainPort 22543
#define buff_size 256
#define MAXLINE 100000
#define sa struct sockaddr
using namespace std;
void dbSearch(int, string&);
void showData(string);
int main() {
struct sockaddr_in dbServerAddr, mainServerAddr;
char dbRecv[buff_size] = {0}, dbIndex;
string dbRply = "";
int soc_d, bnd, response, dbId;
socklen_t addr_len = sizeof(mainServerAddr);
bzero(&dbServerAddr, sizeof(dbServerAddr));
dbServerAddr.sin_family = AF_INET;
dbServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
dbServerAddr.sin_port = htons(dbPort);
soc_d = socket(PF_INET, SOCK_DGRAM, 0);
if (soc_d < 0) {
cout << "ERROR: Setting socket" << endl;
}
bnd = bind(soc_d, (sa *)&dbServerAddr, sizeof(dbServerAddr));
if (bnd < 0) {
cout << "ERROR: binding socket" << endl;
}
cout << "The Database Server is up and running." << endl;
bzero(&mainServerAddr, sizeof(mainServerAddr));
mainServerAddr.sin_family = AF_INET;
mainServerAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
mainServerAddr.sin_port = htons(mainPort);
while(1){
response = recvfrom(soc_d, dbRecv, buff_size, 0, (sa *)&mainServerAddr, &addr_len);
if (response > 0) {
cout << "Received request from Main Server."<<endl;
for (int i = 0; dbRecv[i] != '\0'; i++ ) {
// cout << (int)dbRecv[i] << endl;
dbIndex=(int)dbRecv[i];
}
dbId=(int)dbIndex;
dbSearch(dbId,dbRply);
char arr[buff_size];
strcpy(arr,dbRply.c_str());
response = sendto(soc_d, (const char*)&arr, sizeof(arr), 0, (sa *)&mainServerAddr, sizeof(mainServerAddr));
if (response > 0) {
if(strncmp(arr,"NA",2)==0)
cout<<"No match found."<<endl<<endl;
else{
cout << "Sent link "<<dbId;
showData(dbRply);
}
} else {
cout << "ERROR: Sending response" << endl;
}
} else {
cout << "ERROR: Receiving data" << endl;
}
}
return 0;
}
void dbSearch(int id, string &data){
string myText, myTextArr[10], fid;
int i=0,flag=0,lid=0;
ifstream MyReadFile("database_final.txt");
while (getline (MyReadFile, myText)) {
myTextArr[i++]=myText;
flag++;
}
MyReadFile.close();
for(i=0;i<flag;i++){
int pos=myTextArr[i].find(" ");
fid=myTextArr[i].substr(0,(pos));
stringstream sid(fid);
sid >> lid;
if (lid==id){
data= myTextArr[i].substr(pos+1);
break;
}
else
data = "NA";
}
// cout<<"Data:"<<data<<endl;
}
void showData(string data){
int c,l,v;
string cap, len, vel, dat;
//cout<<endl<<"Data: "<<data<<endl;
int pos=data.find(" ");
cap=data.substr(0,(pos));
dat=data.substr(pos+1);
stringstream cp(cap);
cp >> c;
cout<<", capacity "<<c<<"Mbps";
int pos1=dat.find(" ");
len=dat.substr(0,(pos1));
stringstream ln(len);
ln >> l;
cout<<", link length "<<l<<"km";
vel=dat.substr(pos1+1);
stringstream vp(vel);
vp >> v;
cout<<", propagation velocity "<<v<<"km/s."<<endl<<endl;
}