node/publish.c

   1 #include <avahi-client/publish.h>
   2 #include <avahi-client/lookup.h>
   3
   4 #include <avahi-common/alternative.h>
   5 #include <avahi-common/simple-watch.h>
   6 #include <avahi-common/malloc.h>
   7 #include <avahi-common/error.h>
   8 #include <avahi-common/timeval.h>
   9 #include <avahi-common/strlst.h>
  10 #include <avahi-common/thread-watch.h>
  11
  12 #include <libvirt/libvirt.h>
  13
  14 #include "node.h"
  15
  16 struct list_el {
  17     unsigned int domainid;
  18     AvahiEntryGroup *group;
  19     unsigned short keep;
  20 };
  21
  22 typedef struct list_el domu;
  23
  24 domu * domus = NULL; /* list of domains */
  25 unsigned int domu_count = 0;
  26
  27
  28 static AvahiStringList * domainProperties(virDomainPtr thisDomain) {
  29     AvahiStringList *new = NULL;
  30     // avahi_string_list_new_from_array (NULL, 0);
  31     virDomainInfo info;
  32     virDomainInterfaceStatsStruct stats;
  33     virDomainGetInfo(thisDomain, &info);
  34     new = avahi_string_list_add_printf(new, "maxMem=%lu", info.maxMem);
  35     new = avahi_string_list_add_printf(new, "memory=%lu", info.memory);
  36     new = avahi_string_list_add_printf(new, "cpuTime=%llu", info.cpuTime);
  37
  38     /* TODO: multiple network interfaces :( */
  39     char vifname[16];
  40     snprintf(vifname, 14, "vif%d.0", virDomainGetID(thisDomain));
  41     vifname[15] = '\0';
  42     unsigned int no = 0;
  43
  44     virDomainInterfaceStats(thisDomain, vifname, &stats, sizeof(stats));
  45
  46     new = avahi_string_list_add_printf(new, "interfaces=eth%d", no);
  47     new = avahi_string_list_add_printf(new, "interface_eth%d_rxbytes=%lld",   no, stats.rx_bytes);
  48     new = avahi_string_list_add_printf(new, "interface_eth%d_rxpackets=%lld", no, stats.rx_packets);
  49 //    new = avahi_string_list_add_printf(new, "interface_eth%d_rxerrs=%lld",    no, stats.rx_errs);
  50 //    new = avahi_string_list_add_printf(new, "interface_eth%d_rxdrop=%lld",    no, stats.rx_drop);
  51     new = avahi_string_list_add_printf(new, "interface_eth%d_txbytes=%lld",   no, stats.tx_bytes);
  52     new = avahi_string_list_add_printf(new, "interface_eth%d_txpackets=%lld", no, stats.tx_packets);
  53 //    new = avahi_string_list_add_printf(new, "interface_eth%d_txerrs=%lld",    no, stats.tx_errs);
  54 //    new = avahi_string_list_add_printf(new, "interface_eth%d_txdrop=%lld",    no, stats.tx_drop);
  55
  56     return new;
  57 }
  58
  59 void remove_everything() {
  60     if (domus) {
  61         int i;
  62         for (i = 0; i < domu_count; i++) {
  63             if (domus[i].group) {
  64                 avahi_entry_group_free(domus[i].group);
  65                 domus[i].group = NULL;
  66             }
  67         }
  68         free(domus);
  69         domus = NULL;
  70         domu_count = 0;
  71     }
  72 }
  73
  74 void migrate_everything() {
  75     if (domus) {
  76         virConnectPtr conn;
  77         conn = virConnectOpen(NULL);
  78
  79         if (conn) {
  80             int i;
  81             AvahiThreadedPoll *threaded_poll = NULL;
  82             AvahiClient *client = NULL;
  83
  84             if ((threaded_poll = avahi_threaded_poll_new())) {
  85                 if ((client = avahi_client_new(avahi_threaded_poll_get(threaded_poll), 0, NULL, NULL, NULL)))
  86                     avahi_threaded_poll_start(threaded_poll);
  87             }
  88
  89             for (i = 0; i < domu_count; i++) {
  90                 virDomainPtr dom;
  91                 dom = virDomainLookupByID (conn, domus[i].domainid);
  92
  93                 if (dom) {
  94                     if (client == NULL || migrate_domain(client, threaded_poll, dom) != 0) {
  95                         virDomainShutdown(dom);
  96                         virDomainFree(dom);
  97                     }
  98                 }
  99
 100             }
 101
 102             if (threaded_poll) {
 103                 if (client) {
 104                     avahi_threaded_poll_stop(threaded_poll);
 105                     avahi_client_free(client);
 106                 }
 107
 108                 avahi_threaded_poll_free(threaded_poll);
 109             }
 110
 111             virConnectClose(conn);
 112         }
 113     }
 114 }
 115
 116 static void entry_group_callback_publish(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 117     domu *this = userdata;
 118
 119     switch (state) {
 120         case AVAHI_ENTRY_GROUP_ESTABLISHED:
 121             this->group = g;
 122             break;
 123
 124         case AVAHI_ENTRY_GROUP_FAILURE:
 125         case AVAHI_ENTRY_GROUP_COLLISION:
 126             fprintf(stderr, "Collision\n");
 127             avahi_entry_group_free(g);
 128             this->group = NULL;
 129             break;
 130
 131         default:
 132             break;
 133     }
 134 }
 135
 136
 137 void create_services(AvahiClient *c) {
 138     virConnectPtr conn = virConnectOpenReadOnly(NULL);
 139     if (conn == NULL)
 140         return;
 141     int maxid = virConnectNumOfDomains(conn);
 142     if (maxid > 1) { /* ignore dom0 */
 143         int *ids = (int *) malloc(sizeof(int) * maxid);
 144         if ((maxid = virConnectListDomains(conn, &ids[0], maxid)) < 0) {
 145             // error
 146         } else {
 147             int i;
 148             unsigned int domu_count_new = (maxid - 1);
 149             domu * domus_old = domus;
 150             domus = (domu *) malloc(sizeof(domu) * domu_count_new);
 151             const char *type = "_domu._tcp";
 152
 153             for (i = 0; i < domu_count_new; i++) {
 154                 int j;
 155                 domus[i].group = NULL;
 156                 domus[i].domainid = ids[i+1];
 157                 domus[i].keep = 0;
 158
 159 //                fprintf(stderr, "Looking for %d\n", domus[i].domainid);
 160
 161                 for (j = 0; j < domu_count; j++) {
 162 //                    fprintf(stderr, "--> %d\n", domus_old[j].domainid);
 163                     if (ids[i+1] == domus_old[j].domainid) {
 164 //                        fprintf(stderr, "got it\n");
 165                         virDomainPtr thisDomain = virDomainLookupByID(conn, domus[i].domainid);
 166                         if (thisDomain) {
 167                             const char *name;
 168                             name = virDomainGetName(thisDomain);
 169                             if (name && domus_old[j].group) {
 170                                 domus[i].group = domus_old[j].group;
 171                                 AvahiStringList *domainProps;
 172                                 domainProps = domainProperties(thisDomain);
 173                                 domus_old[j].keep = 1;
 174                                 avahi_entry_group_update_service_txt_strlst(domus[i].group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, domainProps);
 175                                 avahi_string_list_free(domainProps);
 176                             }
 177                             virDomainFree(thisDomain);
 178                         }
 179                     }
 180                 }
 181                 if (i > domu_count || domus[i].group == NULL) {
 182                     const char *name;
 183                     AvahiStringList *domainProps;
 184                     virDomainPtr thisDomain = virDomainLookupByID(conn, ids[i+1]);
 185                     if (thisDomain) {
 186                         AvahiEntryGroup *group;
 187                         group = avahi_entry_group_new(c, entry_group_callback_publish, &domus[i]);
 188                         domainProps = domainProperties(thisDomain);
 189                         name = virDomainGetName(thisDomain);
 190
 191                         if (name) {
 192                             avahi_entry_group_add_service_strlst(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, NULL, 651, domainProps);
 193                             avahi_entry_group_commit(group);
 194                             domus[i].keep = 1;
 195                         } else {
 196                             domus[i].keep = 0;
 197                         }
 198
 199                         avahi_string_list_free(domainProps);
 200                         virDomainFree(thisDomain);
 201                     }
 202                 }
 203             }
 204
 205             for (i = 0; i < domu_count; i++) {
 206                 // fprintf(stderr, "id: %d, keep: %d\n", domus_old[i].domainid, domus_old[i].keep);
 207                 if (domus_old[i].keep == 0 && domus_old[i].group != NULL) {
 208                     avahi_entry_group_free(domus_old[i].group);
 209                     domus_old[i].group = NULL;
 210                 }
 211             }
 212
 213             free(domus_old);
 214             domu_count = domu_count_new;
 215         }
 216         free(ids);
 217     } else {
 218         remove_everything();
 219     }
 220     virConnectClose(conn);
 221     //fprintf(stderr, "exit: %s\n", __func__);
 222 }
 223