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config: simplify and mostly finish 

What still sucks:
 - "on_change" callbacks have little information;
   maybe we could add a user-defined field to the schema;
   also config_schema_apply_to_object() might assign "user_data"
 - no idea how to generate the default configuration file
This commit is contained in:
Přemysl Eric Janouch 2015-05-02 21:10:39 +02:00
parent 5a6b12245b
commit f7c08fdace
1 changed files with 58 additions and 52 deletions
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110
common.c
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@ -553,14 +553,11 @@ struct config_schema
const char *default_; ///< Default as a configuration snippet
/// Check if the new value can be accepted.
/// If this is not defined, only "type" and having a default is considered.
bool (*validate) (struct config_item_ *, const struct config_item_ *);
/// In addition to this, "type" and having a default is considered.
bool (*validate) (const struct config_item_ *, struct error **e);
/// The value has changed. Only appliable to objects.
/// The value has changed
void (*on_changed) (struct config_item_ *);
/// Free any resources located in "item->user_data"
void (*on_destroy) (struct config_item_ *item);
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@ -608,9 +605,6 @@ config_item_free (struct config_item_ *self)
static void
config_item_destroy (struct config_item_ *self)
{
if (self->schema && self->schema->on_destroy)
self->schema->on_destroy (self);
config_item_free (self);
free (self);
}
@ -703,16 +697,18 @@ config_schema_accepts_type
static bool
config_item_validate_by_schema (struct config_item_ *self,
struct config_item_ *source, struct config_schema *schema, struct error **e)
struct config_schema *schema, struct error **e)
{
// Otherwise we check the type and validate the item
if (!config_schema_accepts_type (schema, source->type))
struct error *error = NULL;
if (!config_schema_accepts_type (schema, self->type))
error_set (e, "invalid type of value, expected: %s%s",
config_item_type_name (schema->type),
!schema->default_ ? " (or null)" : "");
else if (schema->validate && !schema->validate (self, source))
// XXX: perhaps "schema->validate" could provide a message for us?
error_set (e, "invalid value");
else if (schema->validate && !schema->validate (self, &error))
{
error_set (e, "%s: %s", "invalid value", error->message);
error_free (error);
}
else
return true;
return false;
@ -730,7 +726,7 @@ config_item_set_from (struct config_item_ *self, struct config_item_ *source,
return true;
}
if (!config_item_validate_by_schema (self, source, schema, e))
if (!config_item_validate_by_schema (source, schema, e))
return false;
// Make sure the string subtype fits the schema
@ -1415,48 +1411,58 @@ end:
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// XXX: this thing is ugly in concept
static void
config_schema_fix_value
(struct config_schema *schema, struct config_item_ *object)
{
struct config_item_ *item =
str_map_find (&object->value.object, schema->name);
bool replace = true;
if (item)
{
struct error *e = NULL;
replace = !config_item_validate_by_schema (item, schema, &e);
if (e)
{
print_error ("resetting configuration item "
"`%s' to default: %s", schema->name, e->message);
error_free (e);
}
}
if (replace)
{
struct error *e = NULL;
struct config_item_ *default_ = config_item_parse
(schema->default_, strlen (schema->default_), true, &e);
if (e || !config_item_validate_by_schema (default_, schema, &e))
exit_fatal ("invalid default for `%s': %s",
schema->name, e->message);
config_item_move (item, default_);
str_map_set (&object->value.object, schema->name, default_);
}
// Make sure the string subtype fits the schema
if (config_item_type_is_string (item->type)
&& config_item_type_is_string (schema->type))
item->type = schema->type;
item->schema = schema;
if (schema->on_changed)
schema->on_changed (item);
}
static void
config_schema_apply_to_object
(struct config_schema *schema_array, struct config_item_ *object)
{
hard_assert (object->type == CONFIG_ITEM_OBJECT);
while (schema_array->name)
{
struct config_schema *schema = schema_array++;
struct config_item_ *item =
str_map_find (&object->value.object, schema->name);
bool make_new = true;
if (item)
{
struct error *e = NULL;
make_new = !config_item_validate_by_schema
(NULL, item, schema, &e);
if (e)
{
print_error ("resetting configuration item "
"`%s' to defaults: %s", schema->name, e->message);
error_free (e);
}
}
if (make_new)
{
struct error *e = NULL;
struct config_item_ *default_ = config_item_parse
(schema->default_, strlen (schema->default_), true, &e);
if (e)
exit_fatal ("invalid default: %s", e->message);
config_item_move (item, default_);
}
item->type = schema->type;
item->schema = schema;
if (schema->on_changed)
schema->on_changed (item);
}
config_schema_fix_value (schema_array++, object);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -