trusts/db-migration.c

   1 #include "../dbapi2/dbapi2.h"
   2 #include "../core/error.h"
   3 #include "../core/nsmalloc.h"
   4 #include "trusts.h"
   5
   6 extern DBAPIConn *trustsdb;
   7 static trustmigration *migration;
   8
   9 static void tm_group(void *, trustgroup *);
  10 static void tm_host(void *, trusthost *, unsigned int);
  11 static void tm_final(void *, int);
  12
  13 trustmigration *migration_start(TrustMigrationGroup, TrustMigrationHost, TrustMigrationFini, void *);
  14 void migration_stop(trustmigration *);
  15 void createtrusttables(int);
  16
  17 struct callbackdata {
  18   void *tag;
  19   unsigned int hostid;
  20   TrustDBMigrationCallback callback;
  21 };
  22
  23 int trusts_migration_start(TrustDBMigrationCallback callback, void *tag) {
  24   struct callbackdata *cbd;
  25
  26   if(migration)
  27     return 1;
  28
  29   cbd = nsmalloc(POOL_TRUSTS, sizeof(struct callbackdata));
  30   if(!cbd)
  31     return 2;
  32
  33   cbd->callback = callback;
  34   cbd->tag = tag;
  35   cbd->hostid = 1;
  36
  37   createtrusttables(TABLES_MIGRATION);
  38   trustsdb->squery(trustsdb, "DELETE FROM ?", "T", "migration_groups");
  39   trustsdb->squery(trustsdb, "DELETE FROM ?", "T", "migration_hosts");
  40
  41   migration = migration_start(tm_group, tm_host, tm_final, cbd);
  42   if(!migration) {
  43     nsfree(POOL_TRUSTS, cbd);
  44     return 3;
  45   }
  46
  47   return 0;
  48 }
  49
  50 void trusts_migration_stop(void) {
  51   if(!migration)
  52     return;
  53
  54   migration_stop(migration);
  55 }
  56
  57 static void tm_group(void *tag, trustgroup *tg) {
  58   if(tg->id % 25 == 0)
  59     Error("trusts_migration", ERR_INFO, "Migration currently at id: %d", tg->id);
  60
  61   trustsdb_inserttg("migration_groups", tg);
  62 }
  63
  64 static void tm_host(void *tag, trusthost *th, unsigned int groupid) {
  65   struct callbackdata *cbd = tag;
  66
  67   th->id = cbd->hostid++;
  68   trustsdb_insertth("migration_hosts", th, groupid);
  69 }
  70
  71 static void tm_complete(const DBAPIResult *r, void *tag) {
  72   struct callbackdata *cbd = tag;
  73   int errcode = 0;
  74
  75   if(!r) {
  76     errcode = MIGRATION_STOPPED;
  77   } else {
  78     if(!r->success) {
  79       Error("trusts_migration", ERR_ERROR, "A error occured executing the rename table query.");
  80       errcode = MIGRATION_LASTERROR;
  81     } else {
  82       Error("trusts_migration", ERR_INFO, "Migration table copying complete.");
  83     }
  84     r->clear(r);
  85   }
  86
  87   if(cbd->callback)
  88     cbd->callback(errcode, cbd->tag);
  89
  90   nsfree(POOL_TRUSTS, cbd);
  91 }
  92
  93 static void tm_final(void *tag, int errcode) {
  94   struct callbackdata *cbd = tag;
  95   migration = NULL;
  96
  97   if(errcode) {
  98     Error("trusts_migration", ERR_ERROR, "Migration error: %d", errcode);
  99     if(cbd) {
 100       cbd->callback(errcode, cbd->tag);
 101       nsfree(POOL_TRUSTS, cbd);
 102     }
 103   } else {
 104     trusts_closedb(0);
 105
 106     Error("trusts_migration", ERR_INFO, "Migration completed, copying tables...");
 107
 108     trustsdb->squery(trustsdb, "BEGIN TRANSACTION", "");
 109     trustsdb->squery(trustsdb, "DROP TABLE ?", "T", "groups");
 110     trustsdb->squery(trustsdb, "ALTER TABLE ? RENAME TO ?", "Ts", "migration_groups", "groups");
 111     trustsdb->squery(trustsdb, "DROP TABLE ?", "T", "hosts");
 112     trustsdb->squery(trustsdb, "ALTER TABLE ? RENAME TO ?", "Ts", "migration_hosts", "hosts");
 113     trustsdb->query(trustsdb, tm_complete, cbd, "COMMIT", "");
 114   }
 115 }