Added server join and init

server/Makefile

@@ -23,6 +23,6 @@ kvstore.o: kvstore.c kvstore.h
 	gcc -c kvstore.c
 
 run: kvserver
-	./kvserver -port=8080 -threadPoolSize=5 -numSetsInCache=4 -sizeOfSet=2
+	./kvserver -port=8081 -threadPoolSize=5 -numSetsInCache=4 -sizeOfSet=2
 clean:
 	rm -f *.o kvserver kvclient *.csv *.xml batchResp*.txt
\ No newline at end of file

server/chord.c

@@ -13,6 +13,7 @@
 #include "utils.h"
 #include <math.h>
 #include "chord.h"
+#include <pthread.h>
 
 #define MAXLOCATIONS 32
 #define MAXIDVALUE 65536
@@ -109,8 +110,17 @@ void sortNodes(Node a[], int n)
 {   
     qsort(a,n,sizeof(Node), compareTwoNodes); 
 }
-
-void setSuccessor(Node allNodes[],int size) {
+Node getSuccessor(int id, Node allNodes[],int size) {
+    int i;
+    for(i = size-1; i >=0; i--) {
+        if(allNodes[i].nodeId<id)
+            break;
+    }
+    if(i==size-1)
+        return allNodes[0];
+    return allNodes[i+1];
+}
+void setSuccessorAndPredecessor(Node allNodes[],int size) {
     int i = 0;
     for(i = 0; i<size; i++) {
         if(chord.node.nodeId==allNodes[i].nodeId)
@@ -128,23 +138,53 @@ void setSuccessor(Node allNodes[],int size) {
     }
 }
 
+void *periodicStabilize(void *arg) {
+    while(1) {
+        stablize();
+        sleep(5);
+    }
+}
+
+void stablize() {
+    FILE *configFile = fopen(".chordConfig","r");
+    Node currNodes[100];
+    char ip[16];
+    int port,id;
+    int i = 0;
+    while(fscanf(configFile,"%s %d %d\n",ip,&port,&id)!=EOF){
+        createNodeStruct(&currNodes[i],ip,port,id);
+        i++;
+    }
+    fclose(configFile);
+    sortNodes(currNodes,i);
+    setSuccessorAndPredecessor(currNodes,i);
+    printf("successor: %d, pred: %d\n",chord.successor.nodeId,chord.predecessor.nodeId);
+    fixFingers(currNodes,i);
+    printFingerTable();
+}
+
 void initChordServer(sockaddr_t serverAddr) {
-    FILE *configFile = fopen("chordConfig","a");
+    FILE *configFile = fopen(".chordConfig","a");
     chord.node.socketAddr = serverAddr;
     chord.node.nodeId = nodeToId(&chord.node.socketAddr);
     int id = nodeToId(&serverAddr);
+    fprintf(configFile,"%s %d %d\n",inet_ntoa(serverAddr.sin_addr),ntohs(serverAddr.sin_port),id);
     fclose(configFile);
     char ip[16];
     int port;
-    configFile = fopen("chordConfig","r");
+    configFile = fopen(".chordConfig","r");
     Node currNodes[100];
     int i = 0;
     while(fscanf(configFile,"%s %d %d\n",ip,&port,&id)!=EOF){
         createNodeStruct(&currNodes[i],ip,port,id);
         i++;
     }
+    fclose(configFile);
     sortNodes(currNodes,i);
-    setSuccessor(currNodes,i);
+    setSuccessorAndPredecessor(currNodes,i);
+    printf("successor: %d, pred: %d\n",chord.successor.nodeId,chord.predecessor.nodeId);
+    fixFingers(currNodes,i);
+    printFingerTable();
 }
 
 void createNodeStruct(Node *givenNode,char ip[16],int port,int id) {
@@ -171,7 +211,7 @@ void initChordStructure(struct sockaddr_in *joinNode,sockaddr_t socketAddrServer
         // Listen for reply 
         // update successor
     }
-    fixFingers();
+    // fixFingers();
     printFingerTable();
 }
 
@@ -211,7 +251,7 @@ Node findSuccessor(int id, bool fixFinger){
             char *msg ,buffer[1000];
             char idString[4];
             sprintf(idString,"%d",id);
-            msg = toXML("find_successor",idString,NULL);
+            // msg = toXML("find_successor",idString,NULL);
             puts(msg);
             //make_packet and send
             sendUDPToNode(msg,preceedingNode,true,buffer);
@@ -235,13 +275,15 @@ Node findSuccessor(int id, bool fixFinger){
 //     sendUDP(msg,chord.successorIp,chord.successorPort,true,buffer);
 // }
 
-void fixFingers(){
-    
-    for(int i = 0; i<3; i++) {
-        Node *newNode = (Node *)malloc(sizeof(Node));
-        getSocketFromIpAndPort("127.0.0.1",1230+i,&newNode->socketAddr);
-        newNode->nodeId = nodeToId(&newNode->socketAddr);
-        chord.fingerTable[i] = newNode;
+void fixFingers(Node allNodes[],int size){
+    for(int i = 0; i<16; i++) {
+        if(chord.fingerTable[i]==NULL)
+            chord.fingerTable[i] = malloc(sizeof(Node));
+        Node newNode =  getSuccessor((chord.node.nodeId + (int)pow(2,i)) % MAXIDVALUE,allNodes,size);
+        chord.fingerTable[i]->socketAddr = newNode.socketAddr;
+        chord.fingerTable[i]->nodeId = newNode.nodeId;
+        strcpy(chord.fingerTable[i]->ip,newNode.ip);
+        chord.fingerTable[i]->port = newNode.port;
     }
 }
 
@@ -258,4 +300,4 @@ void printFingerTable() {
 // int main() {
 //     initChordStructure(NULL);
 //     findSuccessor(123,true);
-// }
+// }
\ No newline at end of file

server/threadPool.c

@@ -276,7 +276,7 @@ void decodeRequestAndProcess(char* buffer) {
         else if(!strcmp(request->operation,"getreq")){
             puts("getreq");
             if(searchKey(request->key,request->val))
-                strcpy(buffer,toXML("resp",request->key,request->val));
+                strcpy(buffer,toXML("resp",request->key,request->val,request->ipAddr,request->port));
             else
                 strcpy(buffer,toRespXML("Does not exist"));
             // puts("buffer");