string HTWorker::compare_swap_internal(const ZPack &zpack) {
string ret;
/*get Package stored by lookup*/
string lresult = lookup_shared(zpack);
ZPack lzpack;
lresult = erase_status_code(lresult);
lzpack.ParseFromString(lresult);
/*get seen_value passed in*/
string seen_value_passed_in = zpack.val();
/*get seen_value stored*/
string seen_value_stored = lzpack.val();
/* printf("{%s}:{%s,%s}\n", zpack.key().c_str(), zpack.val().c_str(),
zpack.newval().c_str());*/
/*they are equivalent, compare and swap*/
if (!seen_value_passed_in.compare(seen_value_stored)) {
lzpack.set_val(zpack.newval());
return insert_shared(lzpack);
} else {
return Const::ZSC_REC_SRVEXP;
}
}
string ZHTClient::commonOpInternal(const string &opcode, const string &key,
const string &val, const string &val2, string &result, int lease) {
ZPack zpack;
zpack.set_opcode(opcode); //"001": lookup, "002": remove, "003": insert, "004": append, "005", compare_swap
zpack.set_replicanum(3);
if (key.empty())
return Const::ZSC_REC_EMPTYKEY; //-1, empty key not allowed.
else
zpack.set_key(key);
if (val.empty()) {
zpack.set_val("^"); //coup, to fix ridiculous bug of protobuf! //to debug
zpack.set_valnull(true);
} else {
zpack.set_val(val);
zpack.set_valnull(false);
}
if (val2.empty()) {
zpack.set_newval("?"); //coup, to fix ridiculous bug of protobuf! //to debug
zpack.set_newvalnull(true);
} else {
zpack.set_newval(val2);
zpack.set_newvalnull(false);
}
zpack.set_lease(Const::toString(lease));
string msg = zpack.SerializeAsString();
/*ZPack tmp;
tmp.ParseFromString(msg);
printf("{%s}:{%s,%s}\n", tmp.key().c_str(), tmp.val().c_str(),
tmp.newval().c_str());*/
char *buf = (char*) calloc(_msg_maxsize, sizeof(char));
size_t msz = _msg_maxsize;
/*send to and receive from*/
_proxy->sendrecv(msg.c_str(), msg.size(), buf, msz);
/*...parse status and result*/
string sstatus;
string srecv(buf);
if (srecv.empty()) {
sstatus = Const::ZSC_REC_SRVEXP;
} else {
result = srecv.substr(3); //the left, if any, is lookup result or second-try zpack
sstatus = srecv.substr(0, 3); //status returned, the first three chars, like 001, -98...
}
free(buf);
return sstatus;
}
string ZHTClient::commonOpInternal(const string &opcode, const string &key,
const string &val, const string &val2, string &result, int lease) {
ZPack zpack;
zpack.set_opcode(opcode); //"001": lookup, "002": remove, "003": insert, "004": append, "005", compare_swap
zpack.set_replicanum(3);
//cout<<"Op Code"<<opcode<<"Key"<<key<<endl;
if (key.empty())
return Const::ZSC_REC_EMPTYKEY; //-1, empty key not allowed.
else
zpack.set_key(key);
if (val.empty()) {
zpack.set_val("^"); //coup, to fix ridiculous bug of protobuf! //to debug
zpack.set_valnull(true);
} else {
zpack.set_val(val);
zpack.set_valnull(false);
}
if (val2.empty()) {
zpack.set_newval("?"); //coup, to fix ridiculous bug of protobuf! //to debug
zpack.set_newvalnull(true);
} else {
zpack.set_newval(val2);
zpack.set_newvalnull(false);
}
zpack.set_lease(Const::toString(lease));
//cout<<"lease "<<lease<<endl;
string msg = zpack.SerializeAsString();
//cout<<msg<<endl;
/*ZPack tmp;
tmp.ParseFromString(msg);
printf("{%s}:{%s,%s}\n", tmp.key().c_str(), tmp.val().c_str(),
tmp.newval().c_str());*/
/*
char *buf = (char*) calloc(_msg_maxsize, sizeof(char));
size_t msz = _msg_maxsize;
*/
/*send to and receive from*/
// this is old making large msg problem
//_proxy->sendrecv(msg.c_str(), msg.size(), buf, msz);
TCPProxy tcp;
ZHTUtil zu;
HostEntity he = zu.getHostEntityByKey(msg);
int sock = tcp.getSockCached(he.host, he.port);
tcp.sendTo(sock, (void*) msg.c_str(), msg.size());
string res;
int recvcount = loopedrecv(sock, NULL, res);
/*...parse status and result*/
string sstatus;
// srecv is no longer used due to a large msg fix. now instead of sendrecv,
//we are using sendto and loopedrecv methods
/*
string srecv(buf);
cout<<"res value is "<<res<<endl;
if (srecv.empty()) {
cout<<"empty"<<endl;
sstatus = Const::ZSC_REC_SRVEXP;
} else {
result = srecv.substr(3); //the left, if any, is lookup result or second-try zpack
//cout<<"srecv string size="<<srecv.size()<<endl;
if (srecv.size() == 36) {
sstatus = srecv.substr(0, 36);
//sstatus=Const::ZSC_REC_REMOVEMETADATAQUEUE;
} else {
sstatus = srecv.substr(0, 3); //status returned, the first three chars, like 001, -98...
}
}
*/
//cout<<"res value is "<<res<<endl;
if (res.empty()) {
//cout<<"empty"<<endl;
sstatus = Const::ZSC_REC_SRVEXP;
} else {
result = res.substr(3); //the left, if any, is lookup result or second-try zpack
//cout<<"srecv string size="<<srecv.size()<<endl;
if (res.size() == 36) {
sstatus = res.substr(0, 36);
//sstatus=Const::ZSC_REC_REMOVEMETADATAQUEUE;
} else {
sstatus = res.substr(0, 3); //status returned, the first three chars, like 001, -98...
}
}
// free(buf);
return sstatus;
}
