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             avahi_entry_group_free(domus[i].group);
  64             domus[i].group = NULL;
  65         }
  66         free(domus);
  67         domus = NULL;
  68         domu_count = 0;
  69     }
  70 }
  71
  72 void migrate_everything() {
  73     if (domus) {
  74         virConnectPtr conn;
  75         conn = virConnectOpen(NULL);
  76
  77         if (conn) {
  78             int i;
  79             AvahiThreadedPoll *threaded_poll = NULL;
  80             AvahiClient *client = NULL;
  81
  82             if ((threaded_poll = avahi_threaded_poll_new())) {
  83                 if ((client = avahi_client_new(avahi_threaded_poll_get(threaded_poll), 0, NULL, NULL, NULL)))
  84                     avahi_threaded_poll_start(threaded_poll);
  85             }
  86
  87             for (i = 0; i < domu_count; i++) {
  88                 virDomainPtr dom;
  89                 dom = virDomainLookupByID (conn, domus[i].domainid);
  90
  91                 if (dom) {
  92                     if (client == NULL || migrate_domain(client, threaded_poll, dom) != 0) {
  93                         virDomainShutdown(dom);
  94                     }
  95
  96                     virDomainFree(dom);
  97                 }
  98
  99             }
 100
 101             if (threaded_poll) {
 102                 if (client) {
 103                     avahi_threaded_poll_stop(threaded_poll);
 104                     avahi_client_free(client);
 105                 }
 106
 107                 avahi_threaded_poll_free(threaded_poll);
 108             }
 109
 110             virConnectClose(conn);
 111         }
 112     }
 113 }
 114
 115
 116 void create_services(AvahiClient *c) {
 117     virConnectPtr conn = virConnectOpenReadOnly(NULL);
 118     if (conn == NULL)
 119         return;
 120     int maxid = virConnectNumOfDomains(conn);
 121     if (maxid > 1) { /* ignore dom0 */
 122         int *ids = (int *) malloc(sizeof(int) * maxid);
 123         if ((maxid = virConnectListDomains(conn, &ids[0], maxid)) < 0) {
 124             // error
 125         } else {
 126             int i;
 127             unsigned int domu_count_new = (maxid - 1);
 128             domu * domus_old = domus;
 129             domus = (domu *) malloc(sizeof(domu) * domu_count_new);
 130             const char *type = "_domu._tcp";
 131
 132             for (i = 0; i < domu_count_new; i++) {
 133                 int j;
 134                 domus[i].group = NULL;
 135                 domus[i].domainid = ids[i+1];
 136                 domus[i].keep = 0;
 137
 138 //                fprintf(stderr, "Looking for %d\n", domus[i].domainid);
 139
 140                 for (j = 0; j < domu_count; j++) {
 141 //                    fprintf(stderr, "--> %d\n", domus_old[j].domainid);
 142                     if (ids[i+1] == domus_old[j].domainid) {
 143 //                        fprintf(stderr, "got it\n");
 144                         virDomainPtr thisDomain = virDomainLookupByID(conn, domus[i].domainid);
 145                         if (thisDomain) {
 146                             const char *name;
 147                             name = virDomainGetName(thisDomain);
 148                             if (name) {
 149                                 domus[i].group = domus_old[j].group;
 150                                 AvahiStringList *domainProps;
 151                                 domainProps = domainProperties(thisDomain);
 152                                 domus_old[j].keep = 1;
 153                                 avahi_entry_group_update_service_txt_strlst(domus[i].group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, domainProps);
 154                                 avahi_string_list_free(domainProps);
 155                             }
 156                             virDomainFree(thisDomain);
 157                         }
 158                     }
 159                 }
 160                 if (i > domu_count || domus[i].group == NULL) {
 161                     const char *name;
 162                     AvahiStringList *domainProps;
 163                     virDomainPtr thisDomain = virDomainLookupByID(conn, ids[i+1]);
 164                     if (thisDomain) {
 165                         domus[i].group = avahi_entry_group_new(c, entry_group_callback, NULL);
 166                         domainProps = domainProperties(thisDomain);
 167                         name = virDomainGetName(thisDomain);
 168
 169                         if (name) {
 170                             avahi_entry_group_add_service_strlst(domus[i].group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, type, NULL, NULL, 651, domainProps);
 171                             avahi_entry_group_commit(domus[i].group);
 172                         } else {
 173                             domus[i].keep = 0;
 174                         }
 175
 176                         avahi_string_list_free(domainProps);
 177                         virDomainFree(thisDomain);
 178                     }
 179                 }
 180             }
 181
 182             for (i = 0; i < domu_count; i++) {
 183                 // fprintf(stderr, "id: %d, keep: %d\n", domus_old[i].domainid, domus_old[i].keep);
 184                 if (domus_old[i].keep == 0 && domus_old[i].group != NULL) {
 185                     avahi_entry_group_free(domus_old[i].group);
 186                     domus_old[i].group = NULL;
 187                 }
 188             }
 189
 190             free(domus_old);
 191             domu_count = domu_count_new;
 192         }
 193         free(ids);
 194     } else {
 195         remove_everything();
 196     }
 197     virConnectClose(conn);
 198     //fprintf(stderr, "exit: %s\n", __func__);
 199 }
 200