commands.c
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	/*
	* Copyright (C) 2013 Andrew Beekhof <andrew@beekhof.net>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This software is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/
	#include <crm_internal.h>

	#include <sys/types.h>
	#include <regex.h>
	#include <glib.h>

	#include <crm/msg_xml.h>
	#include <crm/cluster.h>
	#include <crm/cib.h>
	#include <crm/cluster/internal.h>
	#include <crm/cluster/election.h>
	#include <crm/cib/internal.h>

	#include <internal.h>

	#define ATTRD_PROTOCOL_VERSION "1"

	int last_cib_op_done = 0;
	char *peer_writer = NULL;
	GHashTable *attributes = NULL;

	typedef struct attribute_s {
	char uuid; / TODO: Remove if at all possible */
	char *id;
	char *set;

	GHashTable *values;

	int update;
	int timeout_ms;

	/* TODO: refactor these three as a bitmask */
	bool changed; /* whether attribute value has changed since last write */
	bool unknown_peer_uuids; /* whether we know we're missing a peer uuid */
	gboolean is_private; /* whether to keep this attribute out of the CIB */

	mainloop_timer_t *timer;

	char *user;

	} attribute_t;

	typedef struct attribute_value_s {
	uint32_t nodeid;
	gboolean is_remote;
	char *nodename;
	char *current;
	char *requested;
	char *stored;
	} attribute_value_t;


	void write_attribute(attribute_t *a);
	void write_or_elect_attribute(attribute_t *a);
	void attrd_peer_update(crm_node_t peer, xmlNode xml, const char *host, bool filter);
	void attrd_peer_sync(crm_node_t peer, xmlNode xml);
	void attrd_peer_remove(uint32_t nodeid, const char host, gboolean uncache, const char source);

	static gboolean
	send_attrd_message(crm_node_t * node, xmlNode * data)
	{
	crm_xml_add(data, F_TYPE, T_ATTRD);
	crm_xml_add(data, F_ATTRD_IGNORE_LOCALLY, "atomic-version"); /* Tell older versions to ignore our messages */
	crm_xml_add(data, F_ATTRD_VERSION, ATTRD_PROTOCOL_VERSION);
	crm_xml_add_int(data, F_ATTRD_WRITER, election_state(writer));

	return send_cluster_message(node, crm_msg_attrd, data, TRUE);
	}

	static gboolean
	attribute_timer_cb(gpointer data)
	{
	attribute_t *a = data;
	crm_trace("Dampen interval expired for %s in state %d", a->id, election_state(writer));
	write_or_elect_attribute(a);
	return FALSE;
	}

	static void
	free_attribute_value(gpointer data)
	{
	attribute_value_t *v = data;

	free(v->nodename);
	free(v->current);
	free(v->requested);
	free(v->stored);
	free(v);
	}

	void
	free_attribute(gpointer data)
	{
	attribute_t *a = data;
	if(a) {
	free(a->id);
	free(a->set);
	free(a->uuid);
	free(a->user);

	mainloop_timer_del(a->timer);
	g_hash_table_destroy(a->values);

	free(a);
	}
	}

	static xmlNode *
	build_attribute_xml(
	xmlNode parent, const char name, const char set, const char uuid, unsigned int timeout_ms, const char *user,
	gboolean is_private, const char peer, uint32_t peerid, const char value)
	{
	xmlNode *xml = create_xml_node(parent, __FUNCTION__);

	crm_xml_add(xml, F_ATTRD_ATTRIBUTE, name);
	crm_xml_add(xml, F_ATTRD_SET, set);
	crm_xml_add(xml, F_ATTRD_KEY, uuid);
	crm_xml_add(xml, F_ATTRD_USER, user);
	crm_xml_add(xml, F_ATTRD_HOST, peer);
	crm_xml_add_int(xml, F_ATTRD_HOST_ID, peerid);
	crm_xml_add(xml, F_ATTRD_VALUE, value);
	crm_xml_add_int(xml, F_ATTRD_DAMPEN, timeout_ms/1000);
	crm_xml_add_int(xml, F_ATTRD_IS_PRIVATE, is_private);

	return xml;
	}

	static attribute_t *
	create_attribute(xmlNode *xml)
	{
	int dampen = 0;
	const char *value = crm_element_value(xml, F_ATTRD_DAMPEN);
	attribute_t *a = calloc(1, sizeof(attribute_t));

	a->id = crm_element_value_copy(xml, F_ATTRD_ATTRIBUTE);
	a->set = crm_element_value_copy(xml, F_ATTRD_SET);
	a->uuid = crm_element_value_copy(xml, F_ATTRD_KEY);
	a->values = g_hash_table_new_full(crm_strcase_hash, crm_strcase_equal, NULL, free_attribute_value);

	crm_element_value_int(xml, F_ATTRD_IS_PRIVATE, &a->is_private);

	#if ENABLE_ACL
	crm_trace("Performing all %s operations as user '%s'", a->id, a->user);
	a->user = crm_element_value_copy(xml, F_ATTRD_USER);
	#endif

	if(value) {
	dampen = crm_get_msec(value);
	crm_trace("Created attribute %s with delay %dms (%s)", a->id, dampen, value);
	} else {
	crm_trace("Created attribute %s with no delay", a->id);
	}

	if(dampen > 0) {
	a->timeout_ms = dampen;
	a->timer = mainloop_timer_add(a->id, a->timeout_ms, FALSE, attribute_timer_cb, a);
	}

	g_hash_table_replace(attributes, a->id, a);
	return a;
	}

	/*!
	* \internal
	* \brief Respond to a client peer-remove request (i.e. propagate to all peers)
	*
	* \param[in] client_name Name of client that made request (for log messages)
	* \param[in] xml Root of request XML
	*
	* \return void
	*/
	void
	attrd_client_peer_remove(const char client_name, xmlNode xml)
	{
	const char *host = crm_element_value(xml, F_ATTRD_HOST);

	if (host) {
	crm_info("Client %s is requesting all values for %s be removed",
	client_name, host);
	send_attrd_message(NULL, xml); /* ends up at attrd_peer_message() */
	} else {
	crm_info("Ignoring request by client %s to remove all peer values without specifying peer",
	client_name);
	}
	}

	/*!
	* \internal
	* \brief Respond to a client update request
	*
	* \param[in] xml Root of request XML
	*
	* \return void
	*/
	void
	attrd_client_update(xmlNode *xml)
	{
	attribute_t *a = NULL;
	attribute_value_t *v = NULL;
	char *key = crm_element_value_copy(xml, F_ATTRD_KEY);
	char *set = crm_element_value_copy(xml, F_ATTRD_SET);
	char *host = crm_element_value_copy(xml, F_ATTRD_HOST);
	const char *attr = crm_element_value(xml, F_ATTRD_ATTRIBUTE);
	const char *value = crm_element_value(xml, F_ATTRD_VALUE);
	const char *regex = crm_element_value(xml, F_ATTRD_REGEX);

	/* If a regex was specified, broadcast a message for each match */
	if ((attr == NULL) && regex) {
	GHashTableIter aIter;
	regex_t *r_patt = calloc(1, sizeof(regex_t));

	crm_debug("Setting %s to %s", regex, value);
	if (regcomp(r_patt, regex, REG_EXTENDED)) {
	crm_err("Bad regex '%s' for update", regex);

	} else {
	g_hash_table_iter_init(&aIter, attributes);
	while (g_hash_table_iter_next(&aIter, (gpointer *) & attr, NULL)) {
	int status = regexec(r_patt, attr, 0, NULL, 0);

	if (status == 0) {
	crm_trace("Matched %s with %s", attr, regex);
	crm_xml_add(xml, F_ATTRD_ATTRIBUTE, attr);
	send_attrd_message(NULL, xml);
	}
	}
	}

	free(key);
	free(set);
	free(host);
	regfree(r_patt);
	free(r_patt);
	return;
	}

	if (host == NULL) {
	crm_trace("Inferring host");
	host = strdup(attrd_cluster->uname);
	crm_xml_add(xml, F_ATTRD_HOST, host);
	crm_xml_add_int(xml, F_ATTRD_HOST_ID, attrd_cluster->nodeid);
	}

	a = g_hash_table_lookup(attributes, attr);

	/* If value was specified using ++ or += notation, expand to real value */
	if (value) {
	int offset = 1;
	int int_value = 0;
	static const int plus_plus_len = 5;

	if ((strlen(value) >= (plus_plus_len + 2)) && (value[plus_plus_len] == '+')
	&& ((value[plus_plus_len + 1] == '+') \|\| (value[plus_plus_len + 1] == '='))) {

	if (a) {
	v = g_hash_table_lookup(a->values, host);
	}
	if (v) {
	int_value = char2score(v->current);
	}

	if (value[plus_plus_len + 1] != '+') {
	const char *offset_s = value + (plus_plus_len + 2);

	offset = char2score(offset_s);
	}
	int_value += offset;

	if (int_value > INFINITY) {
	int_value = INFINITY;
	}

	crm_info("Expanded %s=%s to %d", attr, value, int_value);
	crm_xml_add_int(xml, F_ATTRD_VALUE, int_value);

	/* Replacing the value frees the previous memory, so re-query it */
	value = crm_element_value(xml, F_ATTRD_VALUE);
	}
	}

	if ((peer_writer == NULL) && (election_state(writer) != election_in_progress)) {
	crm_info("Starting an election to determine the writer");
	election_vote(writer);
	}

	crm_debug("Broadcasting %s[%s] = %s%s", attr, host, value,
	((election_state(writer) == election_won)? " (writer)" : ""));

	free(key);
	free(set);
	free(host);

	send_attrd_message(NULL, xml); /* ends up at attrd_peer_message() */
	}

	/*!
	* \internal
	* \brief Respond to a client refresh request (i.e. write out all attributes)
	*
	* \return void
	*/
	void
	attrd_client_refresh(void)
	{
	GHashTableIter iter;
	attribute_t *a = NULL;

	/* 'refresh' forces a write of the current value of all attributes
	* Cancel any existing timers, we're writing it NOW
	*/
	g_hash_table_iter_init(&iter, attributes);
	while (g_hash_table_iter_next(&iter, NULL, (gpointer *) & a)) {
	mainloop_timer_stop(a->timer);
	}

	crm_info("Updating all attributes");
	write_attributes(TRUE, FALSE);
	}

	/*!
	* \internal
	* \brief Build the XML reply to a client query
	*
	* param[in] attr Name of requested attribute
	* param[in] host Name of requested host (or NULL for all hosts)
	*
	* \return New XML reply
	* \note Caller is responsible for freeing the resulting XML
	*/
	static xmlNode build_query_reply(const char attr, const char *host)
	{
	xmlNode *reply = create_xml_node(NULL, __FUNCTION__);
	attribute_t *a;

	if (reply == NULL) {
	return NULL;
	}
	crm_xml_add(reply, F_TYPE, T_ATTRD);
	crm_xml_add(reply, F_ATTRD_VERSION, ATTRD_PROTOCOL_VERSION);

	/* If desired attribute exists, add its value(s) to the reply */
	a = g_hash_table_lookup(attributes, attr);
	if (a) {
	attribute_value_t *v;
	xmlNode *host_value;

	crm_xml_add(reply, F_ATTRD_ATTRIBUTE, attr);

	/* Allow caller to use "localhost" to refer to local node */
	if (safe_str_eq(host, "localhost")) {
	host = attrd_cluster->uname;
	crm_trace("Mapped localhost to %s", host);
	}

	/* If a specific node was requested, add its value */
	if (host) {
	v = g_hash_table_lookup(a->values, host);
	host_value = create_xml_node(reply, XML_CIB_TAG_NODE);
	if (host_value == NULL) {
	free_xml(reply);
	return NULL;
	}
	crm_xml_add(host_value, F_ATTRD_HOST, host);
	crm_xml_add(host_value, F_ATTRD_VALUE, (v? v->current : NULL));

	/* Otherwise, add all nodes' values */
	} else {
	GHashTableIter iter;

	g_hash_table_iter_init(&iter, a->values);
	while (g_hash_table_iter_next(&iter, NULL, (gpointer *) &v)) {
	host_value = create_xml_node(reply, XML_CIB_TAG_NODE);
	if (host_value == NULL) {
	free_xml(reply);
	return NULL;
	}
	crm_xml_add(host_value, F_ATTRD_HOST, v->nodename);
	crm_xml_add(host_value, F_ATTRD_VALUE, v->current);
	}
	}
	}
	return reply;
	}

	/*!
	* \internal
	* \brief Respond to a client query
	*
	* \param[in] client Who queried us
	* \param[in] query Root of query XML
	*
	* \return void
	*/
	void
	attrd_client_query(crm_client_t client, uint32_t id, uint32_t flags, xmlNode query)
	{
	const char *attr;
	const char *origin = crm_element_value(query, F_ORIG);
	ssize_t rc;
	xmlNode *reply;

	if (origin == NULL) {
	origin = "unknown client";
	}
	crm_debug("Query arrived from %s", origin);

	/* Request must specify attribute name to query */
	attr = crm_element_value(query, F_ATTRD_ATTRIBUTE);
	if (attr == NULL) {
	crm_warn("Ignoring malformed query from %s (no attribute name given)",
	origin);
	return;
	}

	/* Build the XML reply */
	reply = build_query_reply(attr, crm_element_value(query, F_ATTRD_HOST));
	if (reply == NULL) {
	crm_err("Could not respond to query from %s: could not create XML reply",
	origin);
	return;
	}
	crm_log_xml_trace(reply, "Reply");

	/* Send the reply to the client */
	client->request_id = 0;
	if ((rc = crm_ipcs_send(client, id, reply, flags)) < 0) {
	crm_err("Could not respond to query from %s: %s (%d)",
	origin, pcmk_strerror(-rc), -rc);
	}
	free_xml(reply);
	}

	void
	attrd_peer_message(crm_node_t peer, xmlNode xml)
	{
	int peer_state = 0;
	const char *v = crm_element_value(xml, F_ATTRD_VERSION);
	const char *op = crm_element_value(xml, F_ATTRD_TASK);
	const char *election_op = crm_element_value(xml, F_CRM_TASK);
	const char *host = crm_element_value(xml, F_ATTRD_HOST);

	if(election_op) {
	enum election_result rc = 0;

	crm_xml_add(xml, F_CRM_HOST_FROM, peer->uname);
	rc = election_count_vote(writer, xml, TRUE);
	switch(rc) {
	case election_start:
	free(peer_writer);
	peer_writer = NULL;
	election_vote(writer);
	break;
	case election_lost:
	free(peer_writer);
	peer_writer = strdup(peer->uname);
	break;
	default:
	election_check(writer);
	break;
	}
	return;

	} else if(v == NULL) {
	/* From the non-atomic version */
	if (safe_str_eq(op, ATTRD_OP_UPDATE)) {
	const char *name = crm_element_value(xml, F_ATTRD_ATTRIBUTE);

	crm_trace("Compatibility update of %s from %s", name, peer->uname);
	attrd_peer_update(peer, xml, host, FALSE);

	} else if (safe_str_eq(op, ATTRD_OP_FLUSH)) {
	const char *name = crm_element_value(xml, F_ATTRD_ATTRIBUTE);
	attribute_t *a = g_hash_table_lookup(attributes, name);

	if(a) {
	crm_trace("Compatibility write-out of %s for %s from %s", a->id, op, peer->uname);
	write_or_elect_attribute(a);
	}

	} else if (safe_str_eq(op, ATTRD_OP_REFRESH)) {
	GHashTableIter aIter;
	attribute_t *a = NULL;

	g_hash_table_iter_init(&aIter, attributes);
	while (g_hash_table_iter_next(&aIter, NULL, (gpointer *) & a)) {
	crm_trace("Compatibility write-out of %s for %s from %s", a->id, op, peer->uname);
	write_or_elect_attribute(a);
	}
	}
	}

	crm_element_value_int(xml, F_ATTRD_WRITER, &peer_state);
	if(election_state(writer) == election_won
	&& peer_state == election_won
	&& safe_str_neq(peer->uname, attrd_cluster->uname)) {
	crm_notice("Detected another attribute writer: %s", peer->uname);
	election_vote(writer);

	} else if(peer_state == election_won) {
	if(peer_writer == NULL) {
	peer_writer = strdup(peer->uname);
	crm_notice("Recorded attribute writer: %s", peer->uname);

	} else if(safe_str_neq(peer->uname, peer_writer)) {
	crm_notice("Recorded new attribute writer: %s (was %s)", peer->uname, peer_writer);
	free(peer_writer);
	peer_writer = strdup(peer->uname);
	}
	}

	if (safe_str_eq(op, ATTRD_OP_UPDATE)) {
	attrd_peer_update(peer, xml, host, FALSE);

	} else if (safe_str_eq(op, ATTRD_OP_SYNC)) {
	attrd_peer_sync(peer, xml);

	} else if (safe_str_eq(op, ATTRD_OP_PEER_REMOVE)) {
	int host_id = 0;
	char *endptr = NULL;

	host_id = strtol(host, &endptr, 10);
	if (errno != 0 \|\| endptr == host \|\| *endptr != '\0') {
	host_id = 0;
	} else {
	host = NULL;
	}
	attrd_peer_remove(host_id, host, TRUE, peer->uname);


	} else if (safe_str_eq(op, ATTRD_OP_SYNC_RESPONSE)
	&& safe_str_neq(peer->uname, attrd_cluster->uname)) {
	xmlNode *child = NULL;

	crm_notice("Processing %s from %s", op, peer->uname);
	for (child = __xml_first_child(xml); child != NULL; child = __xml_next(child)) {
	host = crm_element_value(child, F_ATTRD_HOST);
	attrd_peer_update(peer, child, host, TRUE);
	}
	}
	}

	void
	attrd_peer_sync(crm_node_t peer, xmlNode xml)
	{
	GHashTableIter aIter;
	GHashTableIter vIter;

	attribute_t *a = NULL;
	attribute_value_t *v = NULL;
	xmlNode *sync = create_xml_node(NULL, __FUNCTION__);

	crm_xml_add(sync, F_ATTRD_TASK, ATTRD_OP_SYNC_RESPONSE);

	g_hash_table_iter_init(&aIter, attributes);
	while (g_hash_table_iter_next(&aIter, NULL, (gpointer *) & a)) {
	g_hash_table_iter_init(&vIter, a->values);
	while (g_hash_table_iter_next(&vIter, NULL, (gpointer *) & v)) {
	crm_debug("Syncing %s[%s] = %s to %s", a->id, v->nodename, v->current, peer?peer->uname:"everyone");
	build_attribute_xml(sync, a->id, a->set, a->uuid, a->timeout_ms, a->user, a->is_private,
	v->nodename, v->nodeid, v->current);
	}
	}

	crm_debug("Syncing values to %s", peer?peer->uname:"everyone");
	send_attrd_message(peer, sync);
	free_xml(sync);
	}

	void
	attrd_peer_remove(uint32_t nodeid, const char host, gboolean uncache, const char source)
	{
	attribute_t *a = NULL;
	GHashTableIter aIter;

	crm_notice("Removing all %s attributes for %s", host, source);
	if(host == NULL) {
	return;
	}

	g_hash_table_iter_init(&aIter, attributes);
	while (g_hash_table_iter_next(&aIter, NULL, (gpointer *) & a)) {
	if(g_hash_table_remove(a->values, host)) {
	crm_debug("Removed %s[%s] for %s", a->id, host, source);
	}
	}

	if (uncache) {
	crm_remote_peer_cache_remove(host);
	reap_crm_member(nodeid, host);
	}
	}

	/*!
	* \internal
	* \brief Return host's hash table entry (creating one if needed)
	*
	* \param[in] values Hash table of values
	* \param[in] host Name of peer to look up
	* \param[in] xml XML describing the attribute
	*
	* \return Pointer to new or existing hash table entry
	*/
	static attribute_value_t *
	attrd_lookup_or_create_value(GHashTable values, const char host, xmlNode *xml)
	{
	attribute_value_t *v = g_hash_table_lookup(values, host);

	if (v == NULL) {
	v = calloc(1, sizeof(attribute_value_t));
	CRM_ASSERT(v != NULL);

	v->nodename = strdup(host);
	CRM_ASSERT(v->nodename != NULL);

	crm_element_value_int(xml, F_ATTRD_IS_REMOTE, &v->is_remote);
	if (v->is_remote == TRUE) {
	crm_remote_peer_cache_add(host);
	}

	g_hash_table_replace(values, v->nodename, v);
	}
	return(v);
	}

	void
	attrd_peer_update(crm_node_t peer, xmlNode xml, const char *host, bool filter)
	{
	bool changed = FALSE;
	attribute_value_t *v = NULL;

	const char *attr = crm_element_value(xml, F_ATTRD_ATTRIBUTE);
	const char *value = crm_element_value(xml, F_ATTRD_VALUE);

	attribute_t *a = g_hash_table_lookup(attributes, attr);

	if(a == NULL) {
	a = create_attribute(xml);
	}

	if(host == NULL) {
	GHashTableIter vIter;
	g_hash_table_iter_init(&vIter, a->values);

	crm_debug("Setting %s for all hosts to %s", attr, value);

	xml_remove_prop(xml, F_ATTRD_HOST_ID);
	while (g_hash_table_iter_next(&vIter, (gpointer *) & host, NULL)) {
	attrd_peer_update(peer, xml, host, filter);
	}
	return;
	}

	v = attrd_lookup_or_create_value(a->values, host, xml);

	if(filter
	&& safe_str_neq(v->current, value)
	&& safe_str_eq(host, attrd_cluster->uname)) {
	xmlNode *sync = create_xml_node(NULL, __FUNCTION__);
	crm_notice("%s[%s]: local value '%s' takes priority over '%s' from %s",
	a->id, host, v->current, value, peer->uname);

	crm_xml_add(sync, F_ATTRD_TASK, ATTRD_OP_SYNC_RESPONSE);
	v = g_hash_table_lookup(a->values, host);
	build_attribute_xml(sync, a->id, a->set, a->uuid, a->timeout_ms, a->user, a->is_private,
	v->nodename, v->nodeid, v->current);

	crm_xml_add_int(sync, F_ATTRD_WRITER, election_state(writer));
	send_attrd_message(peer, sync);
	free_xml(sync);

	} else if(safe_str_neq(v->current, value)) {
	crm_info("Setting %s[%s]: %s -> %s from %s", attr, host, v->current, value, peer->uname);
	free(v->current);
	if(value) {
	v->current = strdup(value);
	} else {
	v->current = NULL;
	}
	changed = TRUE;

	} else {
	crm_trace("Unchanged %s[%s] from %s is %s", attr, host, peer->uname, value);
	}

	a->changed \|= changed;

	if(changed) {
	if(a->timer) {
	crm_trace("Delayed write out (%dms) for %s", a->timeout_ms, a->id);
	mainloop_timer_start(a->timer);
	} else {
	write_or_elect_attribute(a);
	}
	}

	/* this only involves cluster nodes. */
	if(v->nodeid == 0 && (v->is_remote == FALSE)) {
	if(crm_element_value_int(xml, F_ATTRD_HOST_ID, (int*)&v->nodeid) == 0) {
	/* Create the name/id association */
	crm_node_t *peer = crm_get_peer(v->nodeid, host);
	crm_trace("We know %s's node id now: %s", peer->uname, peer->uuid);
	if(election_state(writer) == election_won) {
	write_attributes(FALSE, TRUE);
	return;
	}
	}
	}
	}

	void
	write_or_elect_attribute(attribute_t *a)
	{
	enum election_result rc = election_state(writer);
	if(rc == election_won) {
	write_attribute(a);

	} else if(rc == election_in_progress) {
	crm_trace("Election in progress to determine who will write out %s", a->id);

	} else if(peer_writer == NULL) {
	crm_info("Starting an election to determine who will write out %s", a->id);
	election_vote(writer);

	} else {
	crm_trace("%s will write out %s, we are in state %d", peer_writer, a->id, rc);
	}
	}

	gboolean
	attrd_election_cb(gpointer user_data)
	{
	crm_trace("Election complete");

	free(peer_writer);
	peer_writer = strdup(attrd_cluster->uname);

	/* Update the peers after an election */
	attrd_peer_sync(NULL, NULL);

	/* Update the CIB after an election */
	write_attributes(TRUE, FALSE);
	return FALSE;
	}


	void
	attrd_peer_change_cb(enum crm_status_type kind, crm_node_t peer, const void data)
	{
	if ((kind == crm_status_nstate) \|\| (kind == crm_status_rstate)) {
	if (safe_str_eq(peer->state, CRM_NODE_MEMBER)) {
	if ((election_state(writer) == election_won)) {
	attrd_peer_sync(peer, NULL);
	}
	} else {
	attrd_peer_remove(peer->id, peer->uname, FALSE, __FUNCTION__);
	if (peer_writer && safe_str_eq(peer->uname, peer_writer)) {
	free(peer_writer);
	peer_writer = NULL;
	crm_notice("Lost attribute writer %s", peer->uname);
	}
	}
	}
	}

	static void
	attrd_cib_callback(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data)
	{
	int level = LOG_ERR;
	GHashTableIter iter;
	const char *peer = NULL;
	attribute_value_t *v = NULL;

	char *name = user_data;
	attribute_t *a = g_hash_table_lookup(attributes, name);

	if(a == NULL) {
	crm_info("Attribute %s no longer exists", name);
	goto done;
	}

	a->update = 0;
	if (rc == pcmk_ok && call_id < 0) {
	rc = call_id;
	}

	switch (rc) {
	case pcmk_ok:
	level = LOG_INFO;
	last_cib_op_done = call_id;
	break;
	case -pcmk_err_diff_failed: /* When an attr changes while the CIB is syncing */
	case -ETIME: /* When an attr changes while there is a DC election */
	case -ENXIO: /* When an attr changes while the CIB is syncing a
	* newer config from a node that just came up
	*/
	level = LOG_WARNING;
	break;
	}

	do_crm_log(level, "Update %d for %s: %s (%d)", call_id, name, pcmk_strerror(rc), rc);

	g_hash_table_iter_init(&iter, a->values);
	while (g_hash_table_iter_next(&iter, (gpointer ) & peer, (gpointer ) & v)) {
	do_crm_log(level, "Update %d for %s[%s]=%s: %s (%d)", call_id, a->id, peer, v->requested, pcmk_strerror(rc), rc);

	if(rc == pcmk_ok) {
	free(v->stored);
	v->stored = v->requested;
	v->requested = NULL;

	} else {
	free(v->requested);
	v->requested = NULL;
	a->changed = TRUE; /* Attempt write out again */
	}
	}
	done:
	free(name);
	if(a && a->changed && election_state(writer) == election_won) {
	write_attribute(a);
	}
	}

	void
	write_attributes(bool all, bool peer_discovered)
	{
	GHashTableIter iter;
	attribute_t *a = NULL;

	g_hash_table_iter_init(&iter, attributes);
	while (g_hash_table_iter_next(&iter, NULL, (gpointer *) & a)) {
	if (peer_discovered && a->unknown_peer_uuids) {
	/* a new peer uuid has been discovered, try writing this attribute again. */
	a->changed = TRUE;
	}

	if(all \|\| a->changed) {
	write_attribute(a);
	} else {
	crm_debug("Skipping unchanged attribute %s", a->id);
	}
	}
	}

	static void
	build_update_element(xmlNode parent, attribute_t a, const char nodeid, const char value)
	{
	char *set = NULL;
	char *uuid = NULL;
	xmlNode *xml_obj = NULL;

	if(a->set) {
	set = strdup(a->set);
	} else {
	set = crm_strdup_printf("%s-%s", XML_CIB_TAG_STATUS, nodeid);
	}

	if(a->uuid) {
	uuid = strdup(a->uuid);
	} else {
	int lpc;
	uuid = crm_strdup_printf("%s-%s", set, a->id);

	/* Minimal attempt at sanitizing automatic IDs */
	for (lpc = 0; uuid[lpc] != 0; lpc++) {
	switch (uuid[lpc]) {
	case ':':
	uuid[lpc] = '.';
	}
	}
	}

	xml_obj = create_xml_node(parent, XML_CIB_TAG_STATE);
	crm_xml_add(xml_obj, XML_ATTR_ID, nodeid);

	xml_obj = create_xml_node(xml_obj, XML_TAG_TRANSIENT_NODEATTRS);
	crm_xml_add(xml_obj, XML_ATTR_ID, nodeid);

	xml_obj = create_xml_node(xml_obj, XML_TAG_ATTR_SETS);
	crm_xml_add(xml_obj, XML_ATTR_ID, set);

	xml_obj = create_xml_node(xml_obj, XML_CIB_TAG_NVPAIR);
	crm_xml_add(xml_obj, XML_ATTR_ID, uuid);
	crm_xml_add(xml_obj, XML_NVPAIR_ATTR_NAME, a->id);

	if(value) {
	crm_xml_add(xml_obj, XML_NVPAIR_ATTR_VALUE, value);

	} else {
	crm_xml_add(xml_obj, XML_NVPAIR_ATTR_VALUE, "");
	crm_xml_add(xml_obj, "__delete__", XML_NVPAIR_ATTR_VALUE);
	}

	free(uuid);
	free(set);
	}

	void
	write_attribute(attribute_t *a)
	{
	int private_updates = 0, cib_updates = 0;
	xmlNode *xml_top = NULL;
	attribute_value_t *v = NULL;
	GHashTableIter iter;
	enum cib_call_options flags = cib_quorum_override;

	if (a == NULL) {
	return;
	}

	/* If this attribute will be written to the CIB ... */
	if (!a->is_private) {

	/* Defer the write if now's not a good time */
	if (the_cib == NULL) {
	crm_info("Write out of '%s' delayed: cib not connected", a->id);
	return;

	} else if (a->update && (a->update < last_cib_op_done)) {
	crm_info("Write out of '%s' continuing: update %d considered lost", a->id, a->update);

	} else if (a->update) {
	crm_info("Write out of '%s' delayed: update %d in progress", a->id, a->update);
	return;

	} else if (mainloop_timer_running(a->timer)) {
	crm_info("Write out of '%s' delayed: timer is running", a->id);
	return;
	}

	/* Initialize the status update XML */
	xml_top = create_xml_node(NULL, XML_CIB_TAG_STATUS);
	}

	/* Attribute will be written shortly, so clear changed flag */
	a->changed = FALSE;

	/* We will check all peers' uuids shortly, so initialize this to false */
	a->unknown_peer_uuids = FALSE;

	/* Iterate over each peer value of this attribute */
	g_hash_table_iter_init(&iter, a->values);
	while (g_hash_table_iter_next(&iter, NULL, (gpointer *) & v)) {
	crm_node_t *peer = crm_get_peer_full(v->nodeid, v->nodename, CRM_GET_PEER_REMOTE\|CRM_GET_PEER_CLUSTER);

	/* If the value's peer info does not correspond to a peer, ignore it */
	if (peer == NULL) {
	crm_notice("Update error (peer not found): %s[%s]=%s failed (host=%p)",
	v->nodename, a->id, v->current, peer);
	continue;
	}

	/* If we're just learning the peer's node id, remember it */
	if (peer->id && (v->nodeid == 0)) {
	crm_trace("Updating value's nodeid");
	v->nodeid = peer->id;
	}

	/* If this is a private attribute, no update needs to be sent */
	if (a->is_private) {
	private_updates++;
	continue;
	}

	/* If the peer is found, but its uuid is unknown, defer write */
	if (peer->uuid == NULL) {
	a->unknown_peer_uuids = TRUE;
	crm_notice("Update error (unknown peer uuid, retry will be attempted once uuid is discovered): %s[%s]=%s failed (host=%p)",
	v->nodename, a->id, v->current, peer);
	continue;
	}

	/* Add this value to status update XML */
	crm_debug("Update: %s[%s]=%s (%s %u %u %s)", v->nodename, a->id,
	v->current, peer->uuid, peer->id, v->nodeid, peer->uname);
	build_update_element(xml_top, a, peer->uuid, v->current);
	cib_updates++;

	free(v->requested);
	v->requested = NULL;
	if (v->current) {
	v->requested = strdup(v->current);
	} else {
	/* Older attrd versions don't know about the cib_mixed_update
	* flag so make sure it goes to the local cib which does
	*/
	flags \|= cib_mixed_update\|cib_scope_local;
	}
	}

	if (private_updates) {
	crm_info("Processed %d private change%s for %s, id=%s, set=%s",
	private_updates, ((private_updates == 1)? "" : "s"),
	a->id, (a->uuid? a->uuid : "<n/a>"), a->set);
	}
	if (cib_updates) {
	crm_log_xml_trace(xml_top, __FUNCTION__);

	a->update = cib_internal_op(the_cib, CIB_OP_MODIFY, NULL, XML_CIB_TAG_STATUS, xml_top, NULL,
	flags, a->user);

	crm_info("Sent update %d with %d changes for %s, id=%s, set=%s",
	a->update, cib_updates, a->id, (a->uuid? a->uuid : "<n/a>"), a->set);

	the_cib->cmds->register_callback(
	the_cib, a->update, 120, FALSE, strdup(a->id), "attrd_cib_callback", attrd_cib_callback);
	}
	free_xml(xml_top);
	}

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