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config: rename "contained" to "derived", and explain it better.

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Don't use "derived" directly, but check its implications for listing
and copying.
This commit is contained in:
Nick Mathewson 2019-09-05 11:48:32 -04:00 committed by David Goulet
parent 668e3a7709
commit 8d685aee7c
2 changed files with 46 additions and 9 deletions
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54
src/app/config/confparse.c
View File

@ -551,13 +551,52 @@ config_var_is_gettable(const config_var_t *var)
return true;
}
bool
config_var_is_contained(const config_var_t *var)
/**
* Return true iff this is variable is "derived" from another -- that is,
* inspecting this variable inspects part of another, and changing this
* variable changes part of another.
*
* Derived variables require special handling in several ways: they do not
* need to be copied independently when we are copying a config object, since
* copying the variable they are derived from copies them too. Similarly,
* they do not need to be compared independently when listing changes, since
* comparing the variable that they are derived from compares them too.
**/
static bool
config_var_is_derived(const config_var_t *var)
{
return struct_var_is_contained(&var->member);
}
/**
* Return true iff we need to check <b>var</b> for changes when we are
* comparing config options for changes.
*
* A false result might mean that the variable is a derived variable, and that
* comparing the variable it derives from compares this one too-- or it might
* mean that there is no data to compare.
**/
static bool
config_var_should_list_changes(const config_var_t *var)
{
return ! config_var_is_derived(var);
}
/**
* Return true iff we need to copy the data for <b>var</b> when we are
* copying a config option.
*
* A false option might mean that the variable is a derived variable, and that
* copying the variable it derives from copies it-- or it might mean that
* there is no data to copy.
**/
static bool
config_var_needs_copy(const config_var_t *var)
{
return ! config_var_is_derived(var);
}
/**h
* Return true iff variable <b>var</b> should appear on list of variables
* given to the controller or the CLI.
**/
@ -578,6 +617,9 @@ config_var_is_listable(const config_var_t *var)
bool
config_var_is_dumpable(const config_var_t *var)
{
if (config_var_is_derived(var)) {
return false;
}
return (var->flags & CVFLAG_NODUMP) == 0;
}
@ -1037,7 +1079,7 @@ config_get_changes(const config_mgr_t *mgr,
config_line_t *result = NULL;
config_line_t **next = &result;
SMARTLIST_FOREACH_BEGIN(mgr->all_vars, managed_var_t *, mv) {
if (config_var_is_contained(mv->cvar)) {
if (! config_var_should_list_changes(mv->cvar)) {
/* something else will check this var, or it doesn't need checking */
continue;
}
@ -1073,7 +1115,7 @@ config_dup(const config_mgr_t *mgr, const void *old)
newopts = config_new(mgr);
SMARTLIST_FOREACH_BEGIN(mgr->all_vars, managed_var_t *, mv) {
if (config_var_is_contained(mv->cvar)) {
if (! config_var_needs_copy(mv->cvar)) {
// Something else will copy this option, or it doesn't need copying.
continue;
}
@ -1140,10 +1182,6 @@ config_dump(const config_mgr_t *mgr, const void *default_options,
elements = smartlist_new();
SMARTLIST_FOREACH_BEGIN(mgr->all_vars, managed_var_t *, mv) {
int comment_option = 0;
if (config_var_is_contained(mv->cvar)) {
// Something else will dump this option, or it doesn't need dumping.
continue;
}
/* Don't save 'hidden' control variables. */
if (! config_var_is_dumpable(mv->cvar))
continue;

1
src/app/config/confparse.h
View File

@ -190,7 +190,6 @@ const char *config_expand_abbrev(const config_mgr_t *mgr,
void warn_deprecated_option(const char *what, const char *why);
bool config_var_is_settable(const config_var_t *var);
bool config_var_is_contained(const config_var_t *var);
bool config_var_is_listable(const config_var_t *var);
bool config_var_is_dumpable(const config_var_t *var);