dlr_pgsql.c

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/*
 * dlr_pgsql.c
 *
 * Implementation of handling delivery reports (DLRs)
 * for PostgreSQL database
 *
 * modeled after dlr_mysql.c
 *
 * Alexander Malysh <a.malysh@centrium.de>, cleanup 2004
 */

#include "gwlib/gwlib.h"
#include "gwlib/dbpool.h"
#include "dlr_p.h"


#ifdef HAVE_PGSQL
#include <libpq-fe.h>

/*
 * Our connection pool to pgsql.
 */
static DBPool *pool = NULL;

/*
 * Database fields, which we are use.
 */
static struct dlr_db_fields *fields = NULL;


static inline int pgsql_update(const Octstr *sql)
{
    DBPoolConn *pc;
    int ret = 0;

#if defined(DLR_TRACE)
    debug("dlr.pgsql", 0, "sql: %s", octstr_get_cstr(sql));
#endif

    pc = dbpool_conn_consume(pool);
    if (pc == NULL) {
        error(0, "PGSQL: Database pool got no connection! DB update failed!");
        return -1;
    }

    if ((ret = dbpool_conn_update(pc, sql, NULL)) == -1)
        error(0, "PGSQL: DB update failed!");
    
    dbpool_conn_produce(pc);
    return ret;
}


static inline List *pgsql_select(const Octstr *sql)
{
    DBPoolConn *pc;
    List *ret = NULL;

#if defined(DLR_TRACE)
    debug("dlr.pgsql", 0, "sql: %s", octstr_get_cstr(sql));
#endif

    pc = dbpool_conn_consume(pool);
    if (pc == NULL) {
        error(0, "PGSQL: Database pool got no connection! DB operation failed!");
        return NULL;
    }

    if (dbpool_conn_select(pc, sql, NULL, &ret) == -1)
        error(0, "PGSQL: Select failed!");
    
    dbpool_conn_produce(pc);
    return ret;
}


static void dlr_pgsql_shutdown()
{
    dbpool_destroy(pool);
    dlr_db_fields_destroy(fields);
}


static void dlr_pgsql_add(struct dlr_entry *entry)
{
    Octstr *sql;

    sql = octstr_format("INSERT INTO %s (%s, %s, %s, %s, %s, %s, %s, %s, %s) VALUES "
                        "('%s', '%s', '%s', '%s', '%s', '%s', '%d', '%s', '%d');",
                        octstr_get_cstr(fields->table), octstr_get_cstr(fields->field_smsc),
                        octstr_get_cstr(fields->field_ts),
                        octstr_get_cstr(fields->field_src), octstr_get_cstr(fields->field_dst),
                        octstr_get_cstr(fields->field_serv), octstr_get_cstr(fields->field_url),
                        octstr_get_cstr(fields->field_mask), octstr_get_cstr(fields->field_boxc),
                        octstr_get_cstr(fields->field_status),
                        octstr_get_cstr(entry->smsc), octstr_get_cstr(entry->timestamp), octstr_get_cstr(entry->source),
                        octstr_get_cstr(entry->destination), octstr_get_cstr(entry->service), octstr_get_cstr(entry->url),
                        entry->mask, octstr_get_cstr(entry->boxc_id), 0);


    pgsql_update(sql);
    
    octstr_destroy(sql);
    dlr_entry_destroy(entry);
}


static struct dlr_entry *dlr_pgsql_get(const Octstr *smsc, const Octstr *ts, const Octstr *dst)
{
    struct dlr_entry *res = NULL;
    Octstr *sql;
    List *result, *row;

    sql = octstr_format("SELECT %s, %s, %s, %s, %s, %s FROM %s WHERE %s='%s' AND %s='%s' LIMIT 1;",
                        octstr_get_cstr(fields->field_mask), octstr_get_cstr(fields->field_serv),
                        octstr_get_cstr(fields->field_url), octstr_get_cstr(fields->field_src),
                        octstr_get_cstr(fields->field_dst), octstr_get_cstr(fields->field_boxc),
                        octstr_get_cstr(fields->table), octstr_get_cstr(fields->field_smsc),
                        octstr_get_cstr(smsc), octstr_get_cstr(fields->field_ts), octstr_get_cstr(ts));


    result = pgsql_select(sql);
    octstr_destroy(sql);

    if (result == NULL || gwlist_len(result) < 1) {
        debug("dlr.pgsql", 0, "no rows found");
        while((row = gwlist_extract_first(result)))
            gwlist_destroy(row, octstr_destroy_item);
        gwlist_destroy(result, NULL);
        return NULL;
    }
    
    row = gwlist_get(result, 0);

    debug("dlr.pgsql", 0, "Found entry, col1=%s, col2=%s, col3=%s, col4=%s, col5=%s col6=%s",
            octstr_get_cstr(gwlist_get(row, 0)),
            octstr_get_cstr(gwlist_get(row, 1)),
            octstr_get_cstr(gwlist_get(row, 2)),
            octstr_get_cstr(gwlist_get(row, 3)),
            octstr_get_cstr(gwlist_get(row, 4)),
            octstr_get_cstr(gwlist_get(row, 5))
     );

    res = dlr_entry_create();
    gw_assert(res != NULL);
    res->mask        = atoi(octstr_get_cstr(gwlist_get(row, 0)));
    res->service     = octstr_duplicate(gwlist_get(row, 1));
    res->url         = octstr_duplicate(gwlist_get(row, 2));
    res->source      = octstr_duplicate(gwlist_get(row, 3));
    res->destination = octstr_duplicate(gwlist_get(row, 4));
    res->boxc_id     = octstr_duplicate(gwlist_get(row, 5));
    res->smsc        = octstr_duplicate(smsc);

    while((row = gwlist_extract_first(result)))
        gwlist_destroy(row, octstr_destroy_item);
    gwlist_destroy(result, NULL);
    
    return res;
}


static void dlr_pgsql_remove(const Octstr *smsc, const Octstr *ts, const Octstr *dst)
{
    Octstr *sql;

    debug("dlr.pgsql", 0, "removing DLR from database");
    sql = octstr_format("DELETE FROM %s WHERE oid = (SELECT oid FROM %s WHERE %s='%s' AND %s='%s' LIMIT 1);",
                        octstr_get_cstr(fields->table), octstr_get_cstr(fields->table),
                        octstr_get_cstr(fields->field_smsc),
                        octstr_get_cstr(smsc), octstr_get_cstr(fields->field_ts), octstr_get_cstr(ts));


    pgsql_update(sql);
    octstr_destroy(sql);
}


static void dlr_pgsql_update(const Octstr *smsc, const Octstr *ts, const Octstr *dst, int status)
{
    Octstr *sql;

    debug("dlr.pgsql", 0, "updating DLR status in database");
    sql = octstr_format("UPDATE %s SET %s=%d WHERE oid = (SELECT oid FROM %s WHERE %s='%s' AND %s='%s' LIMIT 1);",
                        octstr_get_cstr(fields->table),
                        octstr_get_cstr(fields->field_status), status,
                        octstr_get_cstr(fields->table),
                        octstr_get_cstr(fields->field_smsc), octstr_get_cstr(smsc),
                        octstr_get_cstr(fields->field_ts), octstr_get_cstr(ts));
    pgsql_update(sql);
    octstr_destroy(sql);
}


static long dlr_pgsql_messages(void)
{
    Octstr *sql;
    long ret;
    List *res;

    sql = octstr_format("SELECT count(*) FROM %s;", octstr_get_cstr(fields->table));

    res = pgsql_select(sql);
    octstr_destroy(sql);

    if (res == NULL || gwlist_len(res) < 1) {
        error(0, "PGSQL: Could not get count of DLR table");
        ret = -1;
    } else {
        ret = atol(octstr_get_cstr(gwlist_get(gwlist_get(res, 0), 0)));
    }

    gwlist_destroy(gwlist_extract_first(res), octstr_destroy_item);
    gwlist_destroy(res, NULL);
        
    return ret;
}


static void dlr_pgsql_flush(void)
{
    Octstr *sql;

    sql = octstr_format("DELETE FROM %s;", octstr_get_cstr(fields->table));

    pgsql_update(sql);
    octstr_destroy(sql);
}


static struct dlr_storage handles = {
    .type = "pgsql",
    .dlr_add = dlr_pgsql_add,
    .dlr_get = dlr_pgsql_get,
    .dlr_update = dlr_pgsql_update,
    .dlr_remove = dlr_pgsql_remove,
    .dlr_shutdown = dlr_pgsql_shutdown,
    .dlr_messages = dlr_pgsql_messages,
    .dlr_flush = dlr_pgsql_flush
};


struct dlr_storage *dlr_init_pgsql(Cfg *cfg)
{
    CfgGroup *grp;
    List *grplist;
    Octstr *pgsql_host, *pgsql_user, *pgsql_pass, *pgsql_db, *pgsql_id;
    long pgsql_port = 0;
    Octstr *p = NULL;
    long pool_size;
    DBConf *db_conf = NULL;

    /*
     * check for all mandatory directives that specify the field names
     * of the table used
     */
    if (!(grp = cfg_get_single_group(cfg, octstr_imm("dlr-db"))))
        panic(0, "DLR: PgSQL: group 'dlr-db' is not specified!");

    if (!(pgsql_id = cfg_get(grp, octstr_imm("id"))))
        panic(0, "DLR: PgSQL: directive 'id' is not specified!");

    fields = dlr_db_fields_create(grp);
    gw_assert(fields != NULL);

    /*
     * now grap the required information from the 'pgsql-connection' group
     * with the pgsql-id we just obtained
     *
     * we have to loop through all available PostgreSQL connection definitions
     * and search for the one we are looking for
     */

    grplist = cfg_get_multi_group(cfg, octstr_imm("pgsql-connection"));
    while (grplist && (grp = gwlist_extract_first(grplist)) != NULL) {
        p = cfg_get(grp, octstr_imm("id"));
        if (p != NULL && octstr_compare(p, pgsql_id) == 0) {
            goto found;
        }
        if (p != NULL) 
            octstr_destroy(p);
    }
    panic(0, "DLR: PgSQL: connection settings for id '%s' are not specified!",
          octstr_get_cstr(pgsql_id));

found:
    octstr_destroy(p);
    gwlist_destroy(grplist, NULL);

    if (cfg_get_integer(&pool_size, grp, octstr_imm("max-connections")) == -1 || pool_size == 0)
        pool_size = 1;

    if (!(pgsql_host = cfg_get(grp, octstr_imm("host"))))
        panic(0, "DLR: PgSQL: directive 'host' is not specified!");
    if (!(pgsql_user = cfg_get(grp, octstr_imm("username"))))
        panic(0, "DLR: PgSQL: directive 'username' is not specified!");
    if (!(pgsql_pass = cfg_get(grp, octstr_imm("password"))))
        panic(0, "DLR: PgSQL: directive 'password' is not specified!");
    if (!(pgsql_db = cfg_get(grp, octstr_imm("database"))))
        panic(0, "DLR: PgSQL: directive 'database' is not specified!");
    cfg_get_integer(&pgsql_port, grp, octstr_imm("port"));  /* optional */

    /*
     * ok, ready to connect to the database
     */
    db_conf = gw_malloc(sizeof(DBConf));
    gw_assert(db_conf != NULL);

    db_conf->pgsql = gw_malloc(sizeof(PgSQLConf));
    gw_assert(db_conf->pgsql != NULL);

    db_conf->pgsql->host = pgsql_host;
    db_conf->pgsql->port = pgsql_port;
    db_conf->pgsql->username = pgsql_user;
    db_conf->pgsql->password = pgsql_pass;
    db_conf->pgsql->database = pgsql_db;

    pool = dbpool_create(DBPOOL_PGSQL, db_conf, pool_size);
    gw_assert(pool != NULL);

    /*
     * XXX should a failing connect throw panic?!
     */
    if (dbpool_conn_count(pool) == 0)
        panic(0,"DLR: PgSQL: database pool has no connections!");

    octstr_destroy(pgsql_id);

    return &handles;
}
#else
/*
 * Return NULL , so we point dlr-core that we were
 * not compiled in.
 */
struct dlr_storage *dlr_init_pgsql(Cfg* cfg)
{
    return NULL;
}
#endif /* HAVE_PGSQL */

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