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rpc.cpp
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rpc.cpp
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#include "rpc.h"
#include "network.h"
#include "server_function_skels.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include <errno.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <vector>
using namespace std;
int numServerCon = 0;
int end2 = 0;
int sockfdBinder;
fd_set master; // master file descriptor list
fd_set read_fds; // temp file descriptor list for select()
int fdmax; // maximum file descriptor number
int listener; // listening socket descriptor
int newfd; // newly accept()ed socket descriptor
struct sockaddr_storage remoteaddr; // client address
socklen_t addrlen;
pthread_t clientThread;
char* SERVER_ADDRESS;
int PORT;
struct serverFunction {
char* name;
int* argTypes;
int sockfd;
char* address;
int localfd;
int numArgs;
};
vector<serverFunction> cache;
void printArgs(int* argTypes, void ** args) {
for (int i=0; i<len_argTypes(argTypes)-1; i++) {
printf("%d\n", *(int*)args[i]);
}
}
int getargTypesLength(int* argTypes) {
// write code here
int n = 0;
while (*argTypes != 0) {
argTypes++;
n++;
}
return n;
}
struct functionPair {
char* name;
int* argTypes;
};
struct functionMap {
struct functionPair pair;
skeleton skel;
};
std::vector<functionMap> functions;
bool checkFunction2(char* name, int* argTypes, functionPair pair) {
if (strcmp(name, pair.name) == 0) {
if (len_argTypes(argTypes) == len_argTypes(pair.argTypes)) {
for (int i=0; i<len_argTypes(argTypes); i++) {
// just check
if (
(is_input(argTypes[i]) == is_input(pair.argTypes[i])) &&
(is_output(argTypes[i]) == is_output(pair.argTypes[i])) &&
(get_arg_type(argTypes[i]) == get_arg_type(pair.argTypes[i])) &&
((get_arg_length(argTypes[i]) > 0) == (get_arg_length(pair.argTypes[i]) > 0))
) {
return true;
}
}
}
}
return false;
}
skeleton checkFunction(char* name, int* argTypes) {
skeleton skel = NULL;
for (int i=0; i<functions.size(); i++) {
if (checkFunction2(name, argTypes, functions[i].pair)) {
skel = functions[i].skel;
break;
}
}
return skel;
}
void *listenForClient(void * id) {
int i;
// listen
if (listen(listener, 10) == -1) {
// perror("listen");
exit(3);
}
// add the listener to the master set
FD_SET(listener, &master);
fdmax = listener;
// main loop
for(;;) {
if (end2 && (numServerCon == 0)) {
break;
}
read_fds = master; // copy it
if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
// perror("select");
exit(4);
}
// run through the existing connections looking for data to read
for(i = 0; i <= fdmax; i++) {
if (FD_ISSET(i, &read_fds)) { // we got one!!
if (i == listener) {
// handle new connections
addrlen = sizeof remoteaddr;
newfd = accept(listener,
(struct sockaddr *)&remoteaddr,
&addrlen);
if (newfd == -1) {
// perror("accept");
} else {
numServerCon++;
FD_SET(newfd, &master); // add to master set
if (newfd > fdmax) { // keep track of the max
fdmax = newfd;
}
}
} else {
int code;
int code_net;
// Get code
int nbytes;
if ((nbytes = recv(i, &code_net, 4, 0)) <= 0) {
//got error or connection closed by client
if (nbytes == 0) {
//connection closed
// printf("selectserver: socket %d hung up\n", i);
} else {
// perror("recv");
}
numServerCon--;
close(i); // bye!
FD_CLR(i, &master); // remove from master set
break;
}
code = ntohl(code_net);
// printf("code %d\n", code);
if (code == EXECUTE){
char* name = recv_string(i);
int* argTypes = recv_argTypes(i);
void** args = recv_args(i, argTypes);
// printf("\n printing final args\n");
// Now we have all the info we need to run the function
// So run it
skeleton skel = checkFunction(name, argTypes);
int res = -1;
if (skel) {
res = skel(argTypes, args);
}
//Success send back to client
if (res == 0) {
send_integer(i, EXECUTE_SUCCESS);
send_string(i, name);
send_argTypes(i, argTypes);
send_args(i, argTypes, args);
} else {
send_integer(i, EXECUTE_FAILURE);
}
//free(name);
//free(argTypes);
free(args);
}
} // END handle data from client
} // END got new incoming connection
} // END looping through file descriptors
} // END for(;;)--and you thought it would never end!
} // end of function
int rpcInit(){
// this will create a socket for the client and listen to it on a thread
char* buf;
int nbytes;
// char remoteIP[INET6_ADDRSTRLEN];
char hostIP[INET6_ADDRSTRLEN];
int i, rv;
struct addrinfo hints, *ai, *p;
FD_ZERO(&master); // clear the master and temp sets
FD_ZERO(&read_fds);
// get us a socket and bind it
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((rv = getaddrinfo(NULL, "0", &hints, &ai)) != 0) {
// fprintf(stderr, "selectserver: %s\n", gai_strerror(rv));
exit(1);
}
int port_num;
for(p = ai; p != NULL; p = p->ai_next) {
listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (listener < 0) {
continue;
}
// lose the pesky "address already in use" error message
// setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
int ret = bind(listener, p->ai_addr, p->ai_addrlen);
getsockname(listener, (struct sockaddr *)p->ai_addr, (socklen_t *)&p->ai_addrlen);
port_num = getPort((struct sockaddr *)p->ai_addr);
if (ret < 0) {
close(listener);
continue;
}
break;
}
// if we got here, it means we didn't get bound
if (p == NULL) {
// fprintf(stderr, "selectserver: failed to bind\n");
exit(2);
}
// print your server name and port here
gethostname(hostIP, INET6_ADDRSTRLEN);
// printf("SERVER_ADDRESS %s\n", hostIP);
// printf("SERVER_ADDRESS_PORT %d\n", htons(port_num));
SERVER_ADDRESS = (char*)malloc(sizeof(hostIP));
strncpy(SERVER_ADDRESS, hostIP, sizeof(hostIP));
PORT = htons(port_num);
freeaddrinfo(ai); // all done with this
//create a thread for listening purposes
//pthread_create(&clientThread, NULL, listenForClient, (void*)0);
// connect to the binder with a separate socket and keep it open
struct addrinfo hintsB, *servinfoB, *pB;
int rvB;
char sB[INET6_ADDRSTRLEN];
char* hostname = getenv("BINDER_ADDRESS");
char* port = getenv("BINDER_PORT");
memset(&hintsB, 0, sizeof hintsB);
hintsB.ai_family = AF_UNSPEC;
hintsB.ai_socktype = SOCK_STREAM;
if ((rvB = getaddrinfo(hostname, (char*)port, &hintsB, &servinfoB)) != 0) {
// fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// loop through all the results and connect to the first we can
for(pB = servinfoB; pB != NULL; pB = pB->ai_next) {
if ((sockfdBinder = socket(pB->ai_family, pB->ai_socktype,
pB->ai_protocol)) == -1) {
// perror("server: socket");
continue;
}
if (connect(sockfdBinder, pB->ai_addr, pB->ai_addrlen) == -1) {
close(sockfdBinder);
// perror("server: connect");
continue;
}
break;
}
if (pB == NULL) {
// fprintf(stderr, "server: failed to connect\n");
return 2;
}
inet_ntop(pB->ai_family, get_in_addr((struct sockaddr *)pB->ai_addr), sB, sizeof sB);
// printf("server: connecting to %s\n", sB);
// while(1) {
// //do some work
// }
freeaddrinfo(servinfoB);
// printf("\nRPC INIT END\n");
return 0;
}
int connectToSocket(int port, hostent* server){
int sockfd;
struct sockaddr_in server_address;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero((char *) &server_address, sizeof(server_address));
server_address.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&server_address.sin_addr.s_addr,
server->h_length);
server_address.sin_port = htons(port);
if (connect(sockfd,(struct sockaddr *) &server_address,sizeof(server_address)) < 0){
return -1;
}
return sockfd;
}
int rpcCall(char* name, int* argTypes, void** args){
int binder_port = atoi(getenv("BINDER_PORT"));
struct hostent *binder_address = gethostbyname(getenv("BINDER_ADDRESS"));
int sockfd = connectToSocket(binder_port, binder_address);
if (sockfd < 0){
return -1;
}
int i;
send_integer(sockfd, LOC_REQUEST);
send_string(sockfd, name);
send_argTypes(sockfd, argTypes);
int code = recv_integer(sockfd);
if (code != LOC_SUCCESS){
return -1; // LOC_FAILURE
}
int server_port = recv_integer(sockfd);
char* server_addr = recv_string(sockfd);
close(sockfd);
// Connect to server
struct hostent *server_address = gethostbyname(server_addr);
sockfd = connectToSocket(server_port, server_address);
if (sockfd < 0){
return -1;
}
// request_msg format: EXECUTE len_name name len_argTypes argTypes len_args args
send_integer(sockfd, EXECUTE);
send_string(sockfd, name);
send_argTypes(sockfd, argTypes);
send_args(sockfd, argTypes, args);
// Receive from server after it executes
code = recv_integer(sockfd);
if (code == EXECUTE_SUCCESS){
name = recv_string(sockfd);
argTypes = recv_argTypes(sockfd);
void ** args2 = (recv_args(sockfd, argTypes));
for (int i=0; i<len_argTypes(argTypes)-1; i++) {
args[i] = args2[i];
}
} else {
return -1; //execution was not success
}
free(server_addr);
return 0;
}
int rpcCallServer(struct serverFunction s, void** args){
// Connect to server
struct hostent *server_address = gethostbyname(s.address);
int sockfd = connectToSocket(s.sockfd, server_address);
if (sockfd < 0){
return -1;
}
// request_msg format: EXECUTE len_name name len_argTypes argTypes len_args args
send_integer(sockfd, EXECUTE);
send_string(sockfd, s.name);
send_argTypes(sockfd, s.argTypes);
send_args(sockfd, s.argTypes, args);
// Receive from server after it executes
int code = recv_integer(sockfd);
if (code == EXECUTE_SUCCESS){
char* name = recv_string(sockfd);
int* argTypes = recv_argTypes(sockfd);
void ** args2 = (recv_args(sockfd, argTypes));
for (int i=0; i<len_argTypes(argTypes)-1; i++) {
args[i] = args2[i];
}
} else {
return -1; //execution was not success
}
printf("\nRPC CALL END\n");
return 0;
}
int rpcCallBinder(char* name, int* argTypes, void** args){
printf("\nRPC CALL\n");
// Remove all functions first
for(vector<serverFunction>::size_type i = 0; i != cache.size();) {
bool same = false;
int len = len_argTypes(argTypes);
if (strcmp(cache[i].name,name) == 0 && len == cache[i].numArgs){
for (int j=0;j<len; j++){
if (
get_arg_type(argTypes[j]) == get_arg_type(cache[i].argTypes[j]) &&
is_input(argTypes[j]) == is_input(cache[i].argTypes[j]) &&
is_output(argTypes[j]) == is_output(cache[i].argTypes[j]) &&
(get_arg_length(argTypes[j]) > 0) == (get_arg_length(cache[i].argTypes[j]) > 0)
){
same = true;
}
}
}
if (same){
cache.erase(cache.begin() + i);
} else {
i++;
}
}
int binder_port = atoi(getenv("BINDER_PORT"));
struct hostent *binder_address = gethostbyname(getenv("BINDER_ADDRESS"));
int sockfd = connectToSocket(binder_port, binder_address);
if (sockfd < 0){
return -1;
}
send_integer(sockfd, CACHE_REQUEST);
send_string(sockfd, name);
send_argTypes(sockfd, argTypes);
int code = recv_integer(sockfd);
if (code != CACHE_SUCCESS){
return -1;
}
int num_servers = recv_integer(sockfd);
// printf("num servers %d\n", num_servers);
struct serverFunction *servers = recv_servers(sockfd, num_servers);
for (int i=0; i<num_servers; i++){
cache.push_back(servers[i]);
// printf("pushing %s\n\n", servers[i].name);
}
// printf("size cache %d\n", cache.size());
close(sockfd);
}
int rpcCacheCall(char* name, int* argTypes, void** args){
serverFunction s;
int success = -1;
int len = len_argTypes(argTypes);
for(vector<serverFunction>::size_type i = 0; i != cache.size(); i++){
if (strcmp(cache[i].name,name) == 0 && len == cache[i].numArgs){
bool same = true;
for (int j=0;j<len_argTypes(argTypes); j++){
if (
get_arg_type(argTypes[j]) != get_arg_type(cache[i].argTypes[j]) ||
is_input(argTypes[j]) != is_input(cache[i].argTypes[j]) ||
is_output(argTypes[j]) != is_output(cache[i].argTypes[j]) ||
(get_arg_length(argTypes[j]) > 0) != (cache[i].argTypes[j] > 0)
){
same = false;
}
}
if (same){
s = cache[i];
success = rpcCallServer(s, args);
if (success == 0){
// printf("successfully hit cache and returned\n");
break;
}
}
}
}
if (success != 0){
// printf("didn't hit cache now pulling\n");
rpcCallBinder(name, argTypes, args);
// printf("size of cache %d\n", cache.size());
for(vector<serverFunction>::size_type i = 0; i != cache.size(); i++){
// printf("comparing %s %s %d %d\n", cache[i].name, name, len, cache[i].numArgs);
if (strcmp(cache[i].name,name) == 0 && len == cache[i].numArgs){
bool same = true;
for (int j=0;j<len_argTypes(argTypes); j++){
int arg_len = 0;
if(get_arg_length(argTypes[j]) > 0){
arg_len = 1;
}
int cache_arg_len = 0;
if(get_arg_length(cache[i].argTypes[j]) > 0){
cache_arg_len = 1;
}
if (
(get_arg_type(argTypes[j]) != get_arg_type(cache[i].argTypes[j])) ||
(is_input(argTypes[j]) != is_input(cache[i].argTypes[j])) ||
(is_output(argTypes[j]) != is_output(cache[i].argTypes[j])) ||
(arg_len != cache_arg_len)
){
same = false;
}
}
if (same){
s = cache[i];
success = rpcCallServer(s, args);
if (success == 0){
// printf("successfully hit cache and returned\n");
break;
}
}
}
}
if (success != 0){
// printf("didn't hit cache again :(\n");
return -1;
}
}
return 0;
}
int rpcRegister(char* name, int* argTypes, skeleton f){
// REGISTER server_identifier_len server_identifier port len_name name len_argTypes argTypes
int len = len_argTypes(argTypes);
send_integer(sockfdBinder, REGISTER);
send_string(sockfdBinder, SERVER_ADDRESS);
send_integer(sockfdBinder, PORT);
send_string(sockfdBinder, name);
send_argTypes(sockfdBinder, argTypes);
// recv either REGISTER_SUCCESS or REGISTER_FAILURE
int code = recv_integer(sockfdBinder);
int error = recv_integer(sockfdBinder);
if (code == REGISTER_FAILURE){
return error;
} else {
//register was successful so lets add it to map
struct functionPair pair;
pair.name = name;
pair.argTypes = argTypes;
struct functionMap map;
map.pair = pair;
map.skel = f;
functions.push_back(map);
}
return 0;
}
int rpcExecute(){
// printf("HELLO TEHRE ANOTHER THREAD\n");
// listenForClient((void*)0);
pthread_create(&clientThread, NULL, listenForClient, (void*)0);
while(1) {
int code = 0;
code = recv_integer(sockfdBinder);
if (code == TERMINATE) {
end2 = 1;
close(sockfdBinder);
break;
} else if(code < 0) {
close(sockfdBinder);
break;
}
}
return 0;
}
int rpcTerminate(){
int binder_port = atoi(getenv("BINDER_PORT"));
struct hostent *binder_address = gethostbyname(getenv("BINDER_ADDRESS"));
int sockfd = connectToSocket(binder_port, binder_address);
if (sockfd < 0){
return -1;
}
// send terminate message to binder
send_integer(sockfd, TERMINATE);
close(sockfd);
free(SERVER_ADDRESS);
return 0;
}
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int getPort(struct sockaddr *sa) {
if (sa->sa_family == AF_INET) {
return (((struct sockaddr_in*)sa)->sin_port);
}
return (((struct sockaddr_in6*)sa)->sin6_port);
}