ldb_sqlite3.c

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	query = lsqlite3_tprintf(lsql_ac,
				 "UPDATE ldb_entry SET dn = '%q', norm_dn = '%q' "
				 "WHERE norm_dn = '%q';",
				 new_dn, new_cdn, old_cdn);
	if (query == NULL) {
		goto done;
	}

	/* execute */
	ret = sqlite3_exec(lsqlite3->sqlite, query, NULL, NULL, &errmsg);
	if (ret != SQLITE_OK) {
		if (errmsg) {
			ldb_set_errstring(module->ldb, errmsg);
			free(errmsg);
		}
		ret = LDB_ERR_OPERATIONS_ERROR;
		goto done;
	}

	if (lsql_ac->callback) {
		ret = lsql_ac->callback(module->ldb, lsql_ac->context, NULL);
	}

done:
	req->handle->state = LDB_ASYNC_DONE;
	return ret;
}

static int lsql_start_trans(struct ldb_module * module)
{
	int ret;
	char *errmsg;
	struct lsqlite3_private *   lsqlite3 = module->private_data;

	if (lsqlite3->trans_count == 0) {
		ret = sqlite3_exec(lsqlite3->sqlite, "BEGIN IMMEDIATE;", NULL, NULL, &errmsg);
		if (ret != SQLITE_OK) {
			if (errmsg) {
				printf("lsqlite3_start_trans: error: %s\n", errmsg);
				free(errmsg);
			}
			return -1;
		}
	};

	lsqlite3->trans_count++;

	return 0;
}

static int lsql_end_trans(struct ldb_module *module)
{
	int ret;
	char *errmsg;
	struct lsqlite3_private *lsqlite3 = module->private_data;

	if (lsqlite3->trans_count > 0) {
		lsqlite3->trans_count--;
	} else return -1;

	if (lsqlite3->trans_count == 0) {
		ret = sqlite3_exec(lsqlite3->sqlite, "COMMIT;", NULL, NULL, &errmsg);
		if (ret != SQLITE_OK) {
			if (errmsg) {
				printf("lsqlite3_end_trans: error: %s\n", errmsg);
				free(errmsg);
			}
			return -1;
		}
	}

        return 0;
}

static int lsql_del_trans(struct ldb_module *module)
{
	struct lsqlite3_private *lsqlite3 = module->private_data;

	if (lsqlite3->trans_count > 0) {
		lsqlite3->trans_count--;
	} else return -1;

	if (lsqlite3->trans_count == 0) {
		return lsqlite3_safe_rollback(lsqlite3->sqlite);
	}

	return -1;
}

static int destructor(struct lsqlite3_private *lsqlite3)
{        
	if (lsqlite3->sqlite) {
		sqlite3_close(lsqlite3->sqlite);
	}
	return 0;
}

static int lsql_request(struct ldb_module *module, struct ldb_request *req)
{
	return LDB_ERR_OPERATIONS_ERROR;
}

static int lsql_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
	return handle->status;
}

/*
 * Table of operations for the sqlite3 backend
 */
static const struct ldb_module_ops lsqlite3_ops = {
	.name              = "sqlite",
	.search            = lsql_search,
	.add               = lsql_add,
        .modify            = lsql_modify,
        .del               = lsql_delete,
        .rename            = lsql_rename,
	.request           = lsql_request,
	.start_transaction = lsql_start_trans,
	.end_transaction   = lsql_end_trans,
	.del_transaction   = lsql_del_trans,
	.wait              = lsql_wait,
};

/*
 * Static functions
 */

static int initialize(struct lsqlite3_private *lsqlite3,
		      struct ldb_context *ldb, const char *url, int flags)
{
	TALLOC_CTX *local_ctx;
        long long queryInt;
	int rollback = 0;
	char *errmsg;
        char *schema;
        int ret;

	/* create a local ctx */
	local_ctx = talloc_named(lsqlite3, 0, "lsqlite3_rename local context");
	if (local_ctx == NULL) {
		return -1;
	}

	schema = lsqlite3_tprintf(local_ctx,
                
                
                "CREATE TABLE ldb_info AS "
                "  SELECT 'LDB' AS database_type,"
                "         '1.0' AS version;"
                
                /*
                 * The entry table holds the information about an entry. 
                 * This table is used to obtain the EID of the entry and to 
                 * support scope=one and scope=base.  The parent and child
                 * table is included in the entry table since all the other
                 * attributes are dependent on EID.
                 */
                "CREATE TABLE ldb_entry "
                "("
                "  eid     INTEGER PRIMARY KEY AUTOINCREMENT,"
                "  dn      TEXT UNIQUE NOT NULL,"
		"  norm_dn TEXT UNIQUE NOT NULL"
                ");"
                

                "CREATE TABLE ldb_object_classes"
                "("
                "  class_name            TEXT PRIMARY KEY,"
                "  parent_class_name     TEXT,"
                "  tree_key              TEXT UNIQUE,"
                "  max_child_num         INTEGER DEFAULT 0"
                ");"
                
                /*
                 * We keep a full listing of attribute/value pairs here
                 */
                "CREATE TABLE ldb_attribute_values"
                "("
                "  eid             INTEGER REFERENCES ldb_entry,"
                "  attr_name       TEXT,"
                "  norm_attr_name  TEXT,"
                "  attr_value      TEXT,"
                "  norm_attr_value TEXT "
                ");"
                
               
                /*
                 * Indexes
                 */
                "CREATE INDEX ldb_attribute_values_eid_idx "
                "  ON ldb_attribute_values (eid);"
                
                "CREATE INDEX ldb_attribute_values_name_value_idx "
                "  ON ldb_attribute_values (attr_name, norm_attr_value);"
                
                

                /*
                 * Triggers
                 */
 
                "CREATE TRIGGER ldb_object_classes_insert_tr"
                "  AFTER INSERT"
                "  ON ldb_object_classes"
                "  FOR EACH ROW"
                "    BEGIN"
                "      UPDATE ldb_object_classes"
                "        SET tree_key = COALESCE(tree_key, "
                "              ("
                "                SELECT tree_key || "
                "                       (SELECT base160(max_child_num + 1)"
                "                                FROM ldb_object_classes"
                "                                WHERE class_name = "
                "                                      new.parent_class_name)"
                "                  FROM ldb_object_classes "
                "                  WHERE class_name = new.parent_class_name "
                "              ));"
                "      UPDATE ldb_object_classes "
                "        SET max_child_num = max_child_num + 1"
                "        WHERE class_name = new.parent_class_name;"
                "    END;"

                /*
                 * Table initialization
                 */

                "INSERT INTO ldb_object_classes "
                "    (class_name, tree_key) "
                "  VALUES "
                "    ('TOP', '0001');");
        
        /* Skip protocol indicator of url  */
        if (strncmp(url, "sqlite3://", 10) != 0) {
                return SQLITE_MISUSE;
        }
        
        /* Update pointer to just after the protocol indicator */
        url += 10;
        
        /* Try to open the (possibly empty/non-existent) database */
        if ((ret = sqlite3_open(url, &lsqlite3->sqlite)) != SQLITE_OK) {
                return ret;
        }
        
        /* In case this is a new database, enable auto_vacuum */
	ret = sqlite3_exec(lsqlite3->sqlite, "PRAGMA auto_vacuum = 1;", NULL, NULL, &errmsg);
	if (ret != SQLITE_OK) {
		if (errmsg) {
			printf("lsqlite3 initializaion error: %s\n", errmsg);
			free(errmsg);
		}
		goto failed;
	}
        
	if (flags & LDB_FLG_NOSYNC) {
		/* DANGEROUS */
		ret = sqlite3_exec(lsqlite3->sqlite, "PRAGMA synchronous = OFF;", NULL, NULL, &errmsg);
		if (ret != SQLITE_OK) {
			if (errmsg) {
				printf("lsqlite3 initializaion error: %s\n", errmsg);
				free(errmsg);
			}
			goto failed;
		}
	}
        
	/* */
        
        /* Establish a busy timeout of 30 seconds */
        if ((ret = sqlite3_busy_timeout(lsqlite3->sqlite,
                                        30000)) != SQLITE_OK) {
                return ret;
        }

        /* Create a function, callable from sql, to increment a tree_key */
        if ((ret =
             sqlite3_create_function(lsqlite3->sqlite,/* handle */
                                     "base160_next",  /* function name */
                                     1,               /* number of args */
                                     SQLITE_ANY,      /* preferred text type */
                                     NULL,            /* user data */
                                     base160next_sql, /* called func */
                                     NULL,            /* step func */
                                     NULL             /* final func */
                     )) != SQLITE_OK) {
                return ret;
        }

        /* Create a function, callable from sql, to convert int to base160 */
        if ((ret =
             sqlite3_create_function(lsqlite3->sqlite,/* handle */
                                     "base160",       /* function name */
                                     1,               /* number of args */
                                     SQLITE_ANY,      /* preferred text type */
                                     NULL,            /* user data */
                                     base160_sql,     /* called func */
                                     NULL,            /* step func */
                                     NULL             /* final func */
                     )) != SQLITE_OK) {
                return ret;
        }

        /* Create a function, callable from sql, to perform various comparisons */
        if ((ret =
             sqlite3_create_function(lsqlite3->sqlite, /* handle */
                                     "ldap_compare",   /* function name */
                                     4,                /* number of args */
                                     SQLITE_ANY,       /* preferred text type */
                                     ldb  ,            /* user data */
                                     lsqlite3_compare, /* called func */
                                     NULL,             /* step func */
                                     NULL              /* final func */
                     )) != SQLITE_OK) {
                return ret;
        }

        /* Begin a transaction */
	ret = sqlite3_exec(lsqlite3->sqlite, "BEGIN EXCLUSIVE;", NULL, NULL, &errmsg);
	if (ret != SQLITE_OK) {
		if (errmsg) {
			printf("lsqlite3: initialization error: %s\n", errmsg);
			free(errmsg);
		}
		goto failed;
	}
	rollback = 1;
 
        /* Determine if this is a new database.  No tables means it is. */
        if (query_int(lsqlite3,
                      &queryInt,
                      "SELECT COUNT(*)\n"
                      "  FROM sqlite_master\n"
                      "  WHERE type = 'table';") != 0) {
		goto failed;
        }
        
        if (queryInt == 0) {
                /*
                 * Create the database schema
                 */
		ret = sqlite3_exec(lsqlite3->sqlite, schema, NULL, NULL, &errmsg);
		if (ret != SQLITE_OK) {
			if (errmsg) {
				printf("lsqlite3 initializaion error: %s\n", errmsg);
				free(errmsg);
			}
			goto failed;
		}
        } else {
                /*
                 * Ensure that the database we opened is one of ours
                 */
                if (query_int(lsqlite3,
                              &queryInt,
                              "SELECT "
                              "  (SELECT COUNT(*) = 2"
                              "     FROM sqlite_master "
                              "     WHERE type = 'table' "
                              "       AND name IN "
                              "         ("
                              "           'ldb_entry', "
                              "           'ldb_object_classes' "
                              "         ) "
                              "  ) "
                              "  AND "
                              "  (SELECT 1 "
                              "     FROM ldb_info "
                              "     WHERE database_type = 'LDB' "
                              "       AND version = '1.0'"
                              "  );") != 0 ||
                    queryInt != 1) {
                        
                        /* It's not one that we created.  See ya! */
			goto failed;
                }
        }
        
        /* Commit the transaction */
	ret = sqlite3_exec(lsqlite3->sqlite, "COMMIT;", NULL, NULL, &errmsg);
	if (ret != SQLITE_OK) {
		if (errmsg) {
			printf("lsqlite3: iniialization error: %s\n", errmsg);
			free(errmsg);
		}
		goto failed;
	}
 
        return SQLITE_OK;

failed:
	if (rollback) lsqlite3_safe_rollback(lsqlite3->sqlite); 
	sqlite3_close(lsqlite3->sqlite);
	return -1;
}

/*
 * connect to the database
 */
static int lsqlite3_connect(struct ldb_context *ldb,
			    const char *url, 
			    unsigned int flags, 
			    const char *options[],
			    struct ldb_module **module)
{
	int                         i;
        int                         ret;
	struct lsqlite3_private *   lsqlite3 = NULL;
        
	lsqlite3 = talloc(ldb, struct lsqlite3_private);
	if (!lsqlite3) {
		goto failed;
	}
        
	lsqlite3->sqlite = NULL;
	lsqlite3->options = NULL;
	lsqlite3->trans_count = 0;
        
	ret = initialize(lsqlite3, ldb, url, flags);
	if (ret != SQLITE_OK) {
		goto failed;
	}
        
	talloc_set_destructor(lsqlite3, destructor);
        


	*module = talloc(ldb, struct ldb_module);
	if (!module) {
		ldb_oom(ldb);
		goto failed;
	}
	talloc_set_name_const(*module, "ldb_sqlite3 backend");
	(*module)->ldb = ldb;
	(*module)->prev = (*module)->next = NULL;
	(*module)->private_data = lsqlite3;
	(*module)->ops = &lsqlite3_ops;

	if (options) {
		/*
                 * take a copy of the options array, so we don't have to rely
                 * on the caller keeping it around (it might be dynamic)
                 */
		for (i=0;options[i];i++) ;
                
		lsqlite3->options = talloc_array(lsqlite3, char *, i+1);
		if (!lsqlite3->options) {
			goto failed;
		}
                
		for (i=0;options[i];i++) {
                        
			lsqlite3->options[i+1] = NULL;
			lsqlite3->options[i] =
                                talloc_strdup(lsqlite3->options, options[i]);
			if (!lsqlite3->options[i]) {
				goto failed;
			}
		}
	}
        
	return 0;
        
failed:
        if (lsqlite3->sqlite != NULL) {
                (void) sqlite3_close(lsqlite3->sqlite);
        }
	talloc_free(lsqlite3);
	return -1;
}

const struct ldb_backend_ops ldb_sqlite3_backend_ops = {
	.name = "sqlite3",
	.connect_fn = lsqlite3_connect
};