/* * 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 #include #include #include #include #include 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 []" 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 <3 floating pt numbers> * followed by an optional . */ 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 up|down [] * 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); }