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Added new backend plugin callback: plugin_statedata() for getting state data; Added generic xml_merge() function.

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This commit is contained in:
Olof hagsand 2017-07-05 12:30:42 +02:00
parent f5d2473618
commit 4e986d6660
24 changed files with 600 additions and 88 deletions
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97
apps/backend/backend_plugin.c
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@ -68,11 +68,22 @@
* Types
*/
/* Following are specific to backend. For common see clicon_plugin.h
* @note the following should match the prototypes in clicon_backend.h
* @note the following should match the prototypes in clixon_backend.h
*/
#define PLUGIN_RESET "plugin_reset"
typedef int (plgreset_t)(clicon_handle h, char *dbname); /* Reset system status */
/*! Plugin callback, if defined called to get state data from plugin
* @param[in] h Clicon handle
* @param[in] xpath String with XPATH syntax. or NULL for all
* @param[in] xtop XML tree, <config/> on entry.
* @retval 0 OK
* @retval -1 Error
* @see xmldb_get
*/
#define PLUGIN_STATEDATA "plugin_statedata"
typedef int (plgstatedata_t)(clicon_handle h, char *xpath, cxobj *xtop);
#define PLUGIN_TRANS_BEGIN "transaction_begin"
#define PLUGIN_TRANS_VALIDATE "transaction_validate"
#define PLUGIN_TRANS_COMPLETE "transaction_complete"
@ -80,6 +91,7 @@ typedef int (plgreset_t)(clicon_handle h, char *dbname); /* Reset system status
#define PLUGIN_TRANS_END "transaction_end"
#define PLUGIN_TRANS_ABORT "transaction_abort"
typedef int (trans_cb_t)(clicon_handle h, transaction_data td); /* Transaction cbs */
/* Backend (config) plugins */
@ -90,12 +102,14 @@ struct plugin {
plgstart_t *p_start; /* Start */
plgexit_t *p_exit; /* Exit */
plgreset_t *p_reset; /* Reset state */
plgstatedata_t *p_statedata; /* State-data callback */
trans_cb_t *p_trans_begin; /* Transaction start */
trans_cb_t *p_trans_validate; /* Transaction validation */
trans_cb_t *p_trans_complete; /* Transaction validation complete */
trans_cb_t *p_trans_commit; /* Transaction commit */
trans_cb_t *p_trans_end; /* Transaction completed */
trans_cb_t *p_trans_abort; /* Transaction aborted */
};
/*
@ -212,6 +226,8 @@ backend_plugin_load (clicon_handle h,
clicon_debug(2, "%s callback registered.", PLUGIN_EXIT);
if ((new->p_reset = dlsym(handle, PLUGIN_RESET)) != NULL)
clicon_debug(2, "%s callback registered.", PLUGIN_RESET);
if ((new->p_statedata = dlsym(handle, PLUGIN_STATEDATA)) != NULL)
clicon_debug(2, "%s callback registered.", PLUGIN_STATEDATA);
if ((new->p_trans_begin = dlsym(handle, PLUGIN_TRANS_BEGIN)) != NULL)
clicon_debug(2, "%s callback registered.", PLUGIN_TRANS_BEGIN);
if ((new->p_trans_validate = dlsym(handle, PLUGIN_TRANS_VALIDATE)) != NULL)
@ -700,3 +716,82 @@ plugin_transaction_abort(clicon_handle h,
return retval;
}
/*----------------------------------------------------------------------
* Backend state data callbacks
*/
/*! Go through all backend statedata callbacks and collect state data
* This is internal system call, plugin is invoked (does not call) this function
* Backend plugins can register
* @param[in] h clicon handle
* @param[in] xpath String with XPATH syntax. or NULL for all
* @param[in,out] xml XML tree.
* @retval -1 Error
* @retval 0 OK
*/
int
backend_statedata_call(clicon_handle h,
char *xpath,
cxobj *xtop)
{
int retval = -1;
struct plugin *p;
int i;
cxobj *x = NULL;
yang_spec *yspec;
cxobj **xvec = NULL;
size_t xlen;
if ((yspec = clicon_dbspec_yang(h)) == NULL){
clicon_err(OE_YANG, ENOENT, "No yang spec");
goto done;
}
if (xtop==NULL){
clicon_err(OE_CFG, ENOENT, "XML tree expected");
goto done;
}
for (i = 0; i < nplugins; i++) {
p = &plugins[i];
if (p->p_statedata) {
if ((x = xml_new("config", NULL)) == NULL)
goto done;
if ((p->p_statedata)(h, xpath, x) < 0)
goto done;
if (xml_merge(xtop, x, yspec) < 0)
goto done;
if (x){
xml_free(x);
x = NULL;
}
}
}
{
/* Code complex to filter out anything that is outside of xpath */
if (xpath_vec(xtop, xpath?xpath:"/", &xvec, &xlen) < 0)
goto done;
/* If vectors are specified then mark the nodes found and
* then filter out everything else,
* otherwise return complete tree.
*/
if (xvec != NULL){
for (i=0; i<xlen; i++)
xml_flag_set(xvec[i], XML_FLAG_MARK);
}
/* Remove everything that is not marked */
if (!xml_flag(xtop, XML_FLAG_MARK))
if (xml_tree_prune_flagged_sub(xtop, XML_FLAG_MARK, 1, NULL) < 0)
goto done;
/* reset flag */
if (xml_apply(xtop, CX_ELMNT, (xml_applyfn_t*)xml_flag_reset, (void*)XML_FLAG_MARK) < 0)
goto done;
}
retval = 0;
done:
if (x)
xml_free(x);
if (xvec)
free(xvec);
return retval;
}