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/*
* info.c
*
* information support functions
*
* Copyright (c) 2010-2012, PostgreSQL Global Development Group
* contrib/pg_upgrade/info.c
*/

#include "postgres.h"

#include "pg_upgrade.h"

#include "access/transam.h"


static void create_rel_filename_map(const char *old_data, const char *new_data,
const DbInfo *old_db, const DbInfo *new_db,
const RelInfo *old_rel, const RelInfo *new_rel,
FileNameMap *map);
static void get_db_infos(ClusterInfo *cluster);
static void get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo);
static void free_rel_infos(RelInfoArr *rel_arr);
static void print_db_infos(DbInfoArr *dbinfo);
static void print_rel_infos(RelInfoArr *arr);


/*
* gen_db_file_maps()
*
* generates database mappings for "old_db" and "new_db". Returns a malloc'ed
* array of mappings. nmaps is a return parameter which refers to the number
* mappings.
*/
FileNameMap *
gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
int *nmaps, const char *old_pgdata, const char *new_pgdata)
{
FileNameMap *maps;
int relnum;
int num_maps = 0;

if (old_db->rel_arr.nrels != new_db->rel_arr.nrels)
pg_log(PG_FATAL, "old and new databases \"%s\" have a different number of relations\n",
old_db->db_name);

maps = (FileNameMap *) pg_malloc(sizeof(FileNameMap) *
old_db->rel_arr.nrels);

for (relnum = 0; relnum < old_db->rel_arr.nrels; relnum++)
{
RelInfo *old_rel = &old_db->rel_arr.rels[relnum];
RelInfo *new_rel = &new_db->rel_arr.rels[relnum];

if (old_rel->reloid != new_rel->reloid)
pg_log(PG_FATAL, "Mismatch of relation OID in database \"%s\": old OID %d, new OID %d\n",
old_db->db_name, old_rel->reloid, new_rel->reloid);

/*
* TOAST table names initially match the heap pg_class oid.
* In pre-8.4, TOAST table names change during CLUSTER; in pre-9.0,
* TOAST table names change during ALTER TABLE ALTER COLUMN SET TYPE.
* In >= 9.0, TOAST relation names always use heap table oids, hence
* we cannot check relation names when upgrading from pre-9.0.
* Clusters upgraded to 9.0 will get matching TOAST names.
*/
if (strcmp(old_rel->nspname, new_rel->nspname) != 0 ||
((GET_MAJOR_VERSION(old_cluster.major_version) >= 900 ||
strcmp(old_rel->nspname, "pg_toast") != 0) &&
strcmp(old_rel->relname, new_rel->relname) != 0))
pg_log(PG_FATAL, "Mismatch of relation names in database \"%s\": "
"old name \"%s.%s\", new name \"%s.%s\"\n",
old_db->db_name, old_rel->nspname, old_rel->relname,
new_rel->nspname, new_rel->relname);

create_rel_filename_map(old_pgdata, new_pgdata, old_db, new_db,
old_rel, new_rel, maps + num_maps);
num_maps++;
}

*nmaps = num_maps;
return maps;
}


/*
* create_rel_filename_map()
*
* fills a file node map structure and returns it in "map".
*/
static void
create_rel_filename_map(const char *old_data, const char *new_data,
const DbInfo *old_db, const DbInfo *new_db,
const RelInfo *old_rel, const RelInfo *new_rel,
FileNameMap *map)
{
if (strlen(old_rel->tablespace) == 0)
{
/*
* relation belongs to the default tablespace, hence relfiles should
* exist in the data directories.
*/
snprintf(map->old_dir, sizeof(map->old_dir), "%s/base/%u", old_data,
old_db->db_oid);
snprintf(map->new_dir, sizeof(map->new_dir), "%s/base/%u", new_data,
new_db->db_oid);
}
else
{
/* relation belongs to a tablespace, so use the tablespace location */
snprintf(map->old_dir, sizeof(map->old_dir), "%s%s/%u", old_rel->tablespace,
old_cluster.tablespace_suffix, old_db->db_oid);
snprintf(map->new_dir, sizeof(map->new_dir), "%s%s/%u", new_rel->tablespace,
new_cluster.tablespace_suffix, new_db->db_oid);
}

/*
* old_relfilenode might differ from pg_class.oid (and hence
* new_relfilenode) because of CLUSTER, REINDEX, or VACUUM FULL.
*/
map->old_relfilenode = old_rel->relfilenode;

/* new_relfilenode will match old and new pg_class.oid */
map->new_relfilenode = new_rel->relfilenode;

/* used only for logging and error reporing, old/new are identical */
snprintf(map->nspname, sizeof(map->nspname), "%s", old_rel->nspname);
snprintf(map->relname, sizeof(map->relname), "%s", old_rel->relname);
}


void
print_maps(FileNameMap *maps, int n_maps, const char *db_name)
{
if (log_opts.verbose)
{
int mapnum;

pg_log(PG_VERBOSE, "mappings for database \"%s\":\n", db_name);

for (mapnum = 0; mapnum < n_maps; mapnum++)
pg_log(PG_VERBOSE, "%s.%s: %u to %u\n",
maps[mapnum].nspname, maps[mapnum].relname,
maps[mapnum].old_relfilenode,
maps[mapnum].new_relfilenode);

pg_log(PG_VERBOSE, "\n\n");
}
}


/*
* get_db_and_rel_infos()
*
* higher level routine to generate dbinfos for the database running
* on the given "port". Assumes that server is already running.
*/
void
get_db_and_rel_infos(ClusterInfo *cluster)
{
int dbnum;

if (cluster->dbarr.dbs != NULL)
free_db_and_rel_infos(&cluster->dbarr);

get_db_infos(cluster);

for (dbnum = 0; dbnum < cluster->dbarr.ndbs; dbnum++)
get_rel_infos(cluster, &cluster->dbarr.dbs[dbnum]);

pg_log(PG_VERBOSE, "\n%s databases:\n", CLUSTER_NAME(cluster));
if (log_opts.verbose)
print_db_infos(&cluster->dbarr);
}


/*
* get_db_infos()
*
* Scans pg_database system catalog and populates all user
* databases.
*/
static void
get_db_infos(ClusterInfo *cluster)
{
PGconn *conn = connectToServer(cluster, "template1");
PGresult *res;
int ntups;
int tupnum;
DbInfo *dbinfos;
int i_datname,
i_oid,
i_spclocation;
char query[QUERY_ALLOC];

snprintf(query, sizeof(query),
"SELECT d.oid, d.datname, %s "
"FROM pg_catalog.pg_database d "
" LEFT OUTER JOIN pg_catalog.pg_tablespace t "
" ON d.dattablespace = t.oid "
"WHERE d.datallowconn = true "
/* we don't preserve pg_database.oid so we sort by name */
"ORDER BY 2",
/* 9.2 removed the spclocation column */
(GET_MAJOR_VERSION(cluster->major_version) <= 901) ?
"t.spclocation" : "pg_catalog.pg_tablespace_location(t.oid) AS spclocation");

res = executeQueryOrDie(conn, "%s", query);

i_oid = PQfnumber(res, "oid");
i_datname = PQfnumber(res, "datname");
i_spclocation = PQfnumber(res, "spclocation");

ntups = PQntuples(res);
dbinfos = (DbInfo *) pg_malloc(sizeof(DbInfo) * ntups);

for (tupnum = 0; tupnum < ntups; tupnum++)
{
dbinfos[tupnum].db_oid = atooid(PQgetvalue(res, tupnum, i_oid));
snprintf(dbinfos[tupnum].db_name, sizeof(dbinfos[tupnum].db_name), "%s",
PQgetvalue(res, tupnum, i_datname));
snprintf(dbinfos[tupnum].db_tblspace, sizeof(dbinfos[tupnum].db_tblspace), "%s",
PQgetvalue(res, tupnum, i_spclocation));
}
PQclear(res);

PQfinish(conn);

cluster->dbarr.dbs = dbinfos;
cluster->dbarr.ndbs = ntups;
}


/*
* get_rel_infos()
*
* gets the relinfos for all the user tables of the database referred
* by "db".
*
* NOTE: we assume that relations/entities with oids greater than
* FirstNormalObjectId belongs to the user
*/
static void
get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
{
PGconn *conn = connectToServer(cluster,
dbinfo->db_name);
PGresult *res;
RelInfo *relinfos;
int ntups;
int relnum;
int num_rels = 0;
char *nspname = NULL;
char *relname = NULL;
int i_spclocation,
i_nspname,
i_relname,
i_oid,
i_relfilenode,
i_reltablespace;
char query[QUERY_ALLOC];

/*
* pg_largeobject contains user data that does not appear in pg_dumpall
* --schema-only output, so we have to copy that system table heap and
* index. We could grab the pg_largeobject oids from template1, but it is
* easy to treat it as a normal table. Order by oid so we can join old/new
* structures efficiently.
*/

snprintf(query, sizeof(query),
"SELECT c.oid, n.nspname, c.relname, "
" c.relfilenode, c.reltablespace, %s "
"FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n "
" ON c.relnamespace = n.oid "
" LEFT OUTER JOIN pg_catalog.pg_tablespace t "
" ON c.reltablespace = t.oid "
"WHERE relkind IN ('r','t', 'i'%s) AND "
/* exclude possible orphaned temp tables */
" ((n.nspname !~ '^pg_temp_' AND "
" n.nspname !~ '^pg_toast_temp_' AND "
" n.nspname NOT IN ('pg_catalog', 'information_schema', 'binary_upgrade') AND "
" c.oid >= %u) "
" OR (n.nspname = 'pg_catalog' AND "
" relname IN ('pg_largeobject', 'pg_largeobject_loid_pn_index'%s) )) "
/* we preserve pg_class.oid so we sort by it to match old/new */
"ORDER BY 1;",
/* 9.2 removed the spclocation column */
(GET_MAJOR_VERSION(cluster->major_version) <= 901) ?
"t.spclocation" : "pg_catalog.pg_tablespace_location(t.oid) AS spclocation",
/* see the comment at the top of old_8_3_create_sequence_script() */
(GET_MAJOR_VERSION(old_cluster.major_version) <= 803) ?
"" : ", 'S'",
/* this oid allows us to skip system toast tables */
FirstNormalObjectId,
/* does pg_largeobject_metadata need to be migrated? */
(GET_MAJOR_VERSION(old_cluster.major_version) <= 804) ?
"" : ", 'pg_largeobject_metadata', 'pg_largeobject_metadata_oid_index'");

res = executeQueryOrDie(conn, "%s", query);

ntups = PQntuples(res);

relinfos = (RelInfo *) pg_malloc(sizeof(RelInfo) * ntups);

i_oid = PQfnumber(res, "oid");
i_nspname = PQfnumber(res, "nspname");
i_relname = PQfnumber(res, "relname");
i_relfilenode = PQfnumber(res, "relfilenode");
i_reltablespace = PQfnumber(res, "reltablespace");
i_spclocation = PQfnumber(res, "spclocation");

for (relnum = 0; relnum < ntups; relnum++)
{
RelInfo *curr = &relinfos[num_rels++];
const char *tblspace;

curr->reloid = atooid(PQgetvalue(res, relnum, i_oid));

nspname = PQgetvalue(res, relnum, i_nspname);
strlcpy(curr->nspname, nspname, sizeof(curr->nspname));

relname = PQgetvalue(res, relnum, i_relname);
strlcpy(curr->relname, relname, sizeof(curr->relname));

curr->relfilenode = atooid(PQgetvalue(res, relnum, i_relfilenode));

if (atooid(PQgetvalue(res, relnum, i_reltablespace)) != 0)
/* Might be "", meaning the cluster default location. */
tblspace = PQgetvalue(res, relnum, i_spclocation);
else
/* A zero reltablespace indicates the database tablespace. */
tblspace = dbinfo->db_tblspace;

strlcpy(curr->tablespace, tblspace, sizeof(curr->tablespace));
}
PQclear(res);

PQfinish(conn);

dbinfo->rel_arr.rels = relinfos;
dbinfo->rel_arr.nrels = num_rels;
}


void
free_db_and_rel_infos(DbInfoArr *db_arr)
{
int dbnum;

for (dbnum = 0; dbnum < db_arr->ndbs; dbnum++)
free_rel_infos(&db_arr->dbs[dbnum].rel_arr);
pg_free(db_arr->dbs);
db_arr->dbs = NULL;
db_arr->ndbs = 0;
}


static void
free_rel_infos(RelInfoArr *rel_arr)
{
pg_free(rel_arr->rels);
rel_arr->nrels = 0;
}


static void
print_db_infos(DbInfoArr *db_arr)
{
int dbnum;

for (dbnum = 0; dbnum < db_arr->ndbs; dbnum++)
{
pg_log(PG_VERBOSE, "Database: %s\n", db_arr->dbs[dbnum].db_name);
print_rel_infos(&db_arr->dbs[dbnum].rel_arr);
pg_log(PG_VERBOSE, "\n\n");
}
}


static void
print_rel_infos(RelInfoArr *arr)
{
int relnum;

for (relnum = 0; relnum < arr->nrels; relnum++)
pg_log(PG_VERBOSE, "relname: %s.%s: reloid: %u reltblspace: %s\n",
arr->rels[relnum].nspname, arr->rels[relnum].relname,
arr->rels[relnum].reloid, arr->rels[relnum].tablespace);
}
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