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/*
* dmucs_msg.cc: code to parse a packet coming into the DMUCS server.
*
* Copyright (C) 2005, 2006 Victor T. Norman
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "dmucs.h"
#include "dmucs_msg.h"
#include "dmucs_db.h"
#include <exception>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
extern std::string hostsInfoFile;
class DmucsBadMsg : public std::exception {};
DmucsMsg *
DmucsMsg::parseMsg(Socket *sock, const char *buffer)
{
struct in_addr clientIp;
clientIp.s_addr = Speeraddr(sock);
char dpropstr[DPROP_MAX_STRLEN + 1];
dpropstr[0] = '\0'; // empty string
/*
* The first word in the buffer must be one of: "host", "load",
* "status", or "monitor".
*/
if (strncmp(buffer, "host", 4) == 0) {
/* The string is "host <clientIpAddr> [<typeStr>]" where the
typeStr is an optional string that is the distinguishing property
of the host the client wants. */
char cliIpStr[64];
int res = sscanf(buffer, "host %s %s", cliIpStr, dpropstr);
if (res != 2 && res != 1) {
fprintf(stderr, "Got a bad host request message ->%s<--\n",buffer);
return NULL;
}
return new DmucsHostReqMsg(clientIp, dpropstr);
} else if (strncmp(buffer, "load", 4) == 0) {
/* The buffer must hold:
* load <host-IP-address> <3 floating pt numbers>
* followed by an optional <dprop>.
*/
char machname[64];
float ldavg1, ldavg5, ldavg10;
if (sscanf(buffer, "load %s %f %f %f %s", machname, &ldavg1,
&ldavg5, &ldavg10, dpropstr) != 5) {
if (sscanf(buffer, "load %s %f %f %f", machname, &ldavg1,
&ldavg5, &ldavg10) != 4) {
fprintf(stderr, "Got a bad load avg msg!!!\n");
return NULL;
}
}
struct in_addr host;
host.s_addr = inet_addr(machname);
DMUCS_DEBUG((stderr, "host %s: ldAvg1 %2.2f, ldAvg5 %2.2f, "
"ldAvg10 %2.2f, dprop '%s'\n",
machname, ldavg1, ldavg5, ldavg10, dpropstr));
return new DmucsLdAvgMsg(clientIp, host,
ldavg1, ldavg5, ldavg10, dpropstr);
} else if (strncmp(buffer, "status", 6) == 0) {
/* The buffer must hold:
* status <host-IP-address> up|down [<dprop>]
* NOTE: the host-IP-address MUST be in "dot-notation".
*/
char machname[64];
char state[10];
if (sscanf(buffer, "status %s %s %s", machname, state, dpropstr)!= 3){
if (sscanf(buffer, "status %s %s", machname, state) != 2) {
fprintf(stderr, "Got a bad status msg!!!\n");
return NULL;
}
}
fprintf(stderr, "machname %s, state %s, dprop '%s'\n",
machname, state, dpropstr);
struct in_addr host;
host.s_addr = inet_addr(machname);
host_status_t status;
if (strncmp(state, "up", 2) == 0) {
status = STATUS_AVAILABLE;
} else if (strncmp(state, "down", 4) == 0) {
status = STATUS_UNAVAILABLE;
} else {
fprintf(stderr, "got unknown state %s\n", state);
}
return new DmucsStatusMsg(clientIp, host, status, dpropstr);
} else if (strncmp(buffer, "monitor", 7) == 0) {
return new DmucsMonitorReqMsg(clientIp, dpropstr);
}
fprintf(stderr, "request not recognized: ->%s<-\n", buffer);
return NULL;
}
void
DmucsHostReqMsg::handle(Socket *sock, const char *buf)
{
DMUCS_DEBUG((stderr, "Got host request: -->%s<--\n", buf));
DmucsDb *db = DmucsDb::getInstance();
unsigned int cpuIpAddr = 0;
try {
cpuIpAddr = db->getBestAvailCpu(dprop_);
std::string resolved_name =
DmucsHost::resolveIp2Name(cpuIpAddr, dprop_);
fprintf(stderr, "Giving out %s\n", resolved_name.c_str());
db->assignCpuToClient(cpuIpAddr, dprop_, sock);
#if 0
fprintf(stderr, "The databases are now:\n");
db->dump();
#endif
} catch (DmucsNoMoreHosts &e) {
/* getBestAvailCpu() might return 0, when there are
no more available CPUs. We send 0.0.0.0 to the client
but we don't record it as an assigned cpu. */
fprintf(stderr, "!!!!! Out of hosts in db \"%s\" !!!!!\n",
dprop2cstr(dprop_));
} catch (...) {
fprintf(stderr, "!!!!! Some other error: %s!!!!!\n",
strerror(errno));
// Send 0.0.0.0 to the client.
}
struct in_addr c;
c.s_addr = cpuIpAddr;
Sputs(inet_ntoa(c), sock);
}
void
DmucsLdAvgMsg::handle(Socket *sock, const char *buf)
{
DmucsDb *db = DmucsDb::getInstance();
DMUCS_DEBUG((stderr, "Got load average mesg\n"));
try {
DmucsHost *host = db->getHost(host_, dprop_);
host->updateTier(ldAvg1_, ldAvg5_, ldAvg10_);
/* If the host hasn't been explicitly made unavailable,
then make it available. If the host is overloaded
but isn't anymore, then make it available. */
if (host->isSilent() ||
(host->isOverloaded() && host->getTier() != 0)) {
host->avail(); // make sure the host is available
}
} catch (DmucsHostNotFound &e) {
DmucsHost *h = DmucsHost::createHost(host_, dprop_, hostsInfoFile);
h->updateTier(ldAvg1_, ldAvg5_, ldAvg10_);
fprintf(stderr, "New host available: %s/%d, tier %d, type %s\n",
h->getName().c_str(), h->getNumCpus(), h->getTier(),
dprop2cstr(dprop_));
} catch (...) {
}
removeFd(sock);
}
void
DmucsStatusMsg::handle(Socket *sock, const char *buf)
{
DmucsDb *db = DmucsDb::getInstance();
if (status_ == STATUS_AVAILABLE) {
if (db->haveHost(host_, dprop_)) {
/* Make it available (if it wasn't). */
db->getHost(host_, dprop_)->avail();
} else {
/* A new host is available! */
DMUCS_DEBUG((stderr, "Creating new host %s, type %s\n",
inet_ntoa(host_), dprop2cstr(dprop_)));
DmucsHost::createHost(host_, dprop_, hostsInfoFile);
}
} else { // status is unavailable.
db->getHost(host_, dprop_)->unavail();
}
removeFd(sock);
}
void
DmucsMonitorReqMsg::handle(Socket *sock, const char *buf)
{
std::string str = DmucsDb::getInstance()->serialize();
Sputs((char *) str.c_str(), sock);
removeFd(sock);
}
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