ctdb-event: Add event daemon implementation

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>

6 files changed, 1631 insertions, 0 deletions

diff --git a/ctdb/event/event_cmd.c b/ctdb/event/event_cmd.c
new file mode 100644
index 00000000000..c1163416687
--- /dev/null
+++ b/ctdb/event/event_cmd.c
@@ -0,0 +1,358 @@
+/*
+   CTDB event daemon - command handling
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/debug.h"
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+
+#include "event/event_private.h"
+
+struct event_cmd_state {
+	struct event_context *eventd;
+	struct ctdb_event_request *request;
+	struct ctdb_event_reply *reply;
+};
+
+/*
+ * CTDB_EVENT_CMD_RUN
+ */
+
+static void event_cmd_run_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_cmd_run_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct event_context *eventd,
+				struct ctdb_event_request *request,
+				struct ctdb_event_reply *reply)
+{
+	struct tevent_req *req, *subreq;
+	struct event_cmd_state *state;
+	struct run_event_context *run_ctx;
+	struct ctdb_event_request_run *rdata;
+	int ret;
+	bool continue_on_failure = false;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->eventd = eventd;
+	state->request = request;
+	state->reply = reply;
+
+	rdata = request->data.run;
+
+	ret = eventd_run_ctx(eventd, rdata->component, &run_ctx);
+	if (ret != 0) {
+		state->reply->result = ret;
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	if (rdata->flags & CTDB_EVENT_RUN_ALL) {
+		continue_on_failure = true;
+	}
+
+	subreq = run_event_send(state,
+				ev,
+				run_ctx,
+				rdata->event,
+				rdata->args,
+				tevent_timeval_current_ofs(rdata->timeout,0),
+				continue_on_failure);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_cmd_run_done, req);
+
+	return req;
+}
+
+static void event_cmd_run_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_cmd_state *state = tevent_req_data(
+		req, struct event_cmd_state);
+	struct run_event_script_list *script_list = NULL;
+	struct ctdb_event_request_run *rdata;
+	int ret;
+	bool ok;
+
+	ok = run_event_recv(subreq, &ret, state, &script_list);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		state->reply->result = ret;
+		goto done;
+	}
+
+	if (script_list == NULL) {
+		state->reply->result = EIO;
+		goto done;
+	}
+
+	if (script_list->summary == -ECANCELED) {
+		state->reply->result = ECANCELED;
+		goto done;
+	}
+
+	rdata = state->request->data.run;
+	ret = eventd_set_event_result(state->eventd,
+				      rdata->component,
+				      rdata->event,
+				      script_list);
+	if (ret != 0) {
+		state->reply->result = ret;
+		goto done;
+	}
+
+	if (script_list->summary == -ETIME) {
+		state->reply->result = ETIME;
+	} else if (script_list->summary != 0) {
+		state->reply->result = ENOEXEC;
+	}
+
+done:
+	tevent_req_done(req);
+}
+
+/*
+ * CTDB_EVENT_CMD_STATUS
+ */
+
+static struct tevent_req *event_cmd_status_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct event_context *eventd,
+				struct ctdb_event_request *request,
+				struct ctdb_event_reply *reply)
+{
+	struct tevent_req *req;
+	struct event_cmd_state *state;
+	struct ctdb_event_request_run *rdata;
+	struct run_event_script_list *script_list;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	reply->data.status = talloc_zero(reply,
+					 struct ctdb_event_reply_status);
+	if (tevent_req_nomem(reply->data.status, req)) {
+		reply->result = ENOMEM;
+		goto done;
+	}
+
+	rdata = request->data.run;
+
+	ret = eventd_get_event_result(eventd,
+				      rdata->component,
+				      rdata->event,
+				      &script_list);
+	if (ret != 0) {
+		reply->result = ret;
+		goto done;
+	}
+
+	reply->data.status->script_list = eventd_script_list(reply,
+							     script_list);
+	if (reply->data.status->script_list == NULL) {
+		reply->result = ENOMEM;
+		goto done;
+	}
+	reply->data.status->summary = script_list->summary;
+
+	reply->result = 0;
+
+done:
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+/*
+ * CTDB_EVENT_CMD_SCRIPT
+ */
+
+static struct tevent_req *event_cmd_script_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct event_context *eventd,
+				struct ctdb_event_request *request,
+				struct ctdb_event_reply *reply)
+{
+	struct tevent_req *req;
+	struct event_cmd_state *state;
+	struct run_event_context *run_ctx;
+	struct ctdb_event_request_script *rdata;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	rdata = request->data.script;
+
+	ret = eventd_run_ctx(eventd, rdata->component, &run_ctx);
+	if (ret != 0) {
+		reply->result = ret;
+		goto done;
+	}
+
+	if (rdata->action == CTDB_EVENT_SCRIPT_DISABLE) {
+		ret = run_event_script_disable(run_ctx, rdata->script);
+	} else if (rdata->action == CTDB_EVENT_SCRIPT_ENABLE) {
+		ret = run_event_script_enable(run_ctx, rdata->script);
+	} else {
+		D_ERR("Invalid action specified\n");
+		reply->result = EPROTO;
+		goto done;
+	}
+
+	if (ret != 0) {
+		reply->result = ret;
+		goto done;
+	}
+
+	reply->result = 0;
+
+done:
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static bool event_cmd_recv(struct tevent_req *req, int *perr)
+{
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	return true;
+}
+
+
+struct event_cmd_dispatch_state {
+	struct ctdb_event_reply *reply;
+};
+
+static void event_cmd_dispatch_done(struct tevent_req *subreq);
+
+struct tevent_req *event_cmd_dispatch_send(TALLOC_CTX *mem_ctx,
+					   struct tevent_context *ev,
+					   struct event_context *eventd,
+					   struct ctdb_event_request *request)
+{
+	struct tevent_req *req, *subreq;
+	struct event_cmd_dispatch_state *state;
+
+	req = tevent_req_create(mem_ctx,
+				&state,
+				struct event_cmd_dispatch_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->reply = talloc_zero(state, struct ctdb_event_reply);
+	if (tevent_req_nomem(state->reply, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->reply->cmd = request->cmd;
+
+	switch (request->cmd) {
+	case CTDB_EVENT_CMD_RUN:
+		subreq = event_cmd_run_send(state,
+					    ev,
+					    eventd,
+					    request,
+					    state->reply);
+		break;
+
+	case CTDB_EVENT_CMD_STATUS:
+		subreq = event_cmd_status_send(state,
+					       ev,
+					       eventd,
+					       request,
+					       state->reply);
+		break;
+
+	case CTDB_EVENT_CMD_SCRIPT:
+		subreq = event_cmd_script_send(state,
+					       ev,
+					       eventd,
+					       request,
+					       state->reply);
+		break;
+
+	default:
+		state->reply->result = EPROTO;
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_cmd_dispatch_done, req);
+
+	return req;
+}
+
+static void event_cmd_dispatch_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	int ret;
+	bool ok;
+
+	ok = event_cmd_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool event_cmd_dispatch_recv(struct tevent_req *req,
+			     int *perr,
+			     TALLOC_CTX *mem_ctx,
+			     struct ctdb_event_reply **reply)
+{
+	struct event_cmd_dispatch_state *state = tevent_req_data(
+		req, struct event_cmd_dispatch_state);
+
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	*reply = talloc_steal(mem_ctx, state->reply);
+	return true;
+}
diff --git a/ctdb/event/event_config.c b/ctdb/event/event_config.c
new file mode 100644
index 00000000000..d2826225c80
--- /dev/null
+++ b/ctdb/event/event_config.c
@@ -0,0 +1,122 @@
+/*
+   CTDB event daemon - config handling
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+
+#include <talloc.h>
+
+#include "common/conf.h"
+#include "common/logging_conf.h"
+#include "common/path.h"
+
+#include "event/event_private.h"
+#include "event/event_conf.h"
+
+struct event_config {
+	char *config_file;
+	struct conf_context *conf;
+
+	const char *logging_location;
+	const char *logging_loglevel;
+	const char *debug_script;
+};
+
+int event_config_init(TALLOC_CTX *mem_ctx, struct event_config **result)
+{
+	struct event_config *config;
+	int ret;
+	bool ok;
+
+	config = talloc_zero(mem_ctx, struct event_config);
+	if (config == NULL) {
+		return ENOMEM;
+	}
+
+	config->config_file = path_config(config);
+	if (config->config_file == NULL) {
+		talloc_free(config);
+		return ENOMEM;
+	}
+
+	ret = conf_init(config, &config->conf);
+	if (ret != 0) {
+		talloc_free(config);
+		return ret;
+	}
+
+	logging_conf_init(config->conf, NULL);
+
+	conf_assign_string_pointer(config->conf,
+				   LOGGING_CONF_SECTION,
+				   LOGGING_CONF_LOCATION,
+				   &config->logging_location);
+	conf_assign_string_pointer(config->conf,
+				   LOGGING_CONF_SECTION,
+				   LOGGING_CONF_LOG_LEVEL,
+				   &config->logging_loglevel);
+
+	event_conf_init(config->conf);
+
+	conf_assign_string_pointer(config->conf,
+				   EVENT_CONF_SECTION,
+				   EVENT_CONF_DEBUG_SCRIPT,
+				   &config->debug_script);
+
+	ok = conf_valid(config->conf);
+	if (!ok) {
+		talloc_free(config);
+		return EINVAL;
+	}
+
+	ret = conf_load(config->conf, config->config_file, true);
+	if (ret != 0 && ret != ENOENT) {
+		talloc_free(config);
+		return ret;
+	}
+
+	*result = config;
+	return 0;
+}
+
+const char *event_config_log_location(struct event_config *config)
+{
+	return config->logging_location;
+}
+
+const char *event_config_log_level(struct event_config *config)
+{
+	return config->logging_loglevel;
+}
+
+const char *event_config_debug_script(struct event_config *config)
+{
+	return config->debug_script;
+}
+
+int event_config_reload(struct event_config *config)
+{
+	int ret;
+
+	ret = conf_reload(config->conf);
+	if (ret != 0 && ret != ENOENT) {
+		return ret;
+	}
+
+	return 0;
+}
diff --git a/ctdb/event/event_context.c b/ctdb/event/event_context.c
new file mode 100644
index 00000000000..79bcd834576
--- /dev/null
+++ b/ctdb/event/event_context.c
@@ -0,0 +1,472 @@
+/*
+   CTDB event daemon - daemon state
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/dir.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/debug.h"
+#include "lib/util/dlinklist.h"
+
+#include "common/logging.h"
+#include "common/run_event.h"
+#include "common/path.h"
+
+#include "event/event_private.h"
+
+struct event_event {
+	struct event_event *prev, *next;
+
+	const char *name;
+	struct run_event_script_list *script_list;
+};
+
+struct event_component {
+	struct event_component *prev, *next;
+
+	/* component state */
+	const char *name;
+	const char *path;
+	struct run_event_context *run_ctx;
+
+	/* events list */
+	struct event_event *event;
+};
+
+struct event_client {
+	struct event_client *prev, *next;
+
+	struct sock_client_context *client;
+};
+
+struct event_context {
+	struct tevent_context *ev;
+	struct event_config *config;
+	struct run_proc_context *run_proc_ctx;
+
+	const char *script_dir;
+	const char *debug_script;
+
+	/* component list */
+	struct event_component *component;
+
+	/* client list */
+	struct event_client *client;
+};
+
+/*
+ * event_event functions
+ */
+
+static struct event_event *eventd_event_find(struct event_component *comp,
+					     const char *event_name)
+{
+	struct event_event *event;
+
+	if (event_name == NULL) {
+		return NULL;
+	}
+
+	for (event = comp->event; event != NULL; event = event->next) {
+		if (strcmp(event->name, event_name) == 0) {
+			return event;
+		}
+	}
+
+	return NULL;
+}
+
+static int eventd_event_add(struct event_component *comp,
+			    const char *event_name,
+			    struct event_event **result)
+{
+	struct event_event *event;
+
+	if (event_name == NULL) {
+		return EINVAL;
+	}
+
+	event = eventd_event_find(comp, event_name);
+	if (event != NULL) {
+		goto done;
+	}
+
+	event = talloc_zero(comp, struct event_event);
+	if (event == NULL) {
+		return ENOMEM;
+	}
+
+	event->name = talloc_strdup(event, event_name);
+	if (event->name == NULL) {
+		talloc_free(event);
+		return ENOMEM;
+	}
+
+	DLIST_ADD_END(comp->event, event);
+
+done:
+	if (result != NULL) {
+		*result = event;
+	}
+	return 0;
+}
+
+static int eventd_event_set(struct event_component *comp,
+			    const char *event_name,
+			    struct run_event_script_list *script_list)
+{
+	struct event_event *event = NULL;
+	int ret;
+
+	ret = eventd_event_add(comp, event_name, &event);
+	if (ret != 0) {
+		return ret;
+	}
+
+	TALLOC_FREE(event->script_list);
+	if (script_list != NULL) {
+		event->script_list = talloc_steal(event, script_list);
+	}
+
+	return 0;
+}
+
+static int eventd_event_get(struct event_component *comp,
+			    const char *event_name,
+			    struct run_event_script_list **result)
+{
+	struct event_event *event;
+
+	event = eventd_event_find(comp, event_name);
+	if (event == NULL) {
+		return EINVAL;
+	}
+
+	*result = event->script_list;
+	return 0;
+}
+
+/*
+ * event_component functions
+ */
+
+static struct event_component *eventd_component_find(
+					struct event_context *eventd,
+					const char *comp_name)
+{
+	struct event_component *comp;
+
+	if (comp_name == NULL) {
+		return NULL;
+	}
+
+	for (comp = eventd->component; comp != NULL; comp = comp->next) {
+		if (strcmp(comp->name, comp_name) == 0) {
+			return comp;
+		}
+	}
+
+	return NULL;
+}
+
+static int eventd_component_add(struct event_context *eventd,
+				const char *comp_name,
+				struct event_component **result)
+{
+	struct event_component *comp;
+	int ret;
+
+	if (comp_name == NULL) {
+		return EINVAL;
+	}
+
+	comp = eventd_component_find(eventd, comp_name);
+	if (comp != NULL) {
+		goto done;
+	}
+
+	comp = talloc_zero(eventd, struct event_component);
+	if (comp == NULL) {
+		return ENOMEM;
+	}
+
+	comp->name = talloc_strdup(comp, comp_name);
+	if (comp->name == NULL) {
+		talloc_free(comp);
+		return ENOMEM;
+	}
+
+	comp->path = talloc_asprintf(comp,
+				     "%s/%s",
+				     eventd->script_dir,
+				     comp_name);
+	if (comp->path == NULL) {
+		talloc_free(comp);
+		return ENOMEM;
+	}
+
+	ret = run_event_init(eventd,
+			     eventd->run_proc_ctx,
+			     comp->path,
+			     eventd->debug_script,
+			     &comp->run_ctx);
+	if (ret != 0) {
+		talloc_free(comp);
+		return ret;
+	}
+
+	DLIST_ADD_END(eventd->component, comp);
+
+done:
+	if (result != NULL) {
+		*result = comp;
+	}
+	return 0;
+}
+
+/*
+ * event_client functions
+ */
+
+static struct event_client *eventd_client_find(
+					struct event_context *eventd,
+					struct sock_client_context *client)
+{
+	struct event_client *e;
+
+	for (e = eventd->client; e != NULL; e = e->next) {
+		if (e->client == client) {
+			return e;
+		}
+	}
+
+	return NULL;
+}
+
+int eventd_client_add(struct event_context *eventd,
+		      struct sock_client_context *client)
+{
+	struct event_client *e;
+
+	e = talloc_zero(eventd, struct event_client);
+	if (e == NULL) {
+		return ENOMEM;
+	}
+
+	e->client = client;
+
+	DLIST_ADD_END(eventd->client, e);
+
+	return 0;
+}
+
+void eventd_client_del(struct event_context *eventd,
+		       struct sock_client_context *client)
+{
+	struct event_client *e;
+
+	e = eventd_client_find(eventd, client);
+	if (e == NULL) {
+		return;
+	}
+
+	DLIST_REMOVE(eventd->client, e);
+
+	talloc_free(e);
+}
+
+bool eventd_client_exists(struct event_context *eventd,
+			  struct sock_client_context *client)
+{
+	struct event_client *e;
+
+	e = eventd_client_find(eventd, client);
+	if (e == NULL) {
+		return false;
+	}
+
+	return true;
+}
+
+/* public functions */
+
+int event_context_init(TALLOC_CTX *mem_ctx,
+		       struct tevent_context *ev,
+		       struct event_config *config,
+		       struct event_context **result)
+{
+	struct event_context *eventd;
+	const char *debug_script;
+	int ret;
+
+	eventd = talloc_zero(mem_ctx, struct event_context);
+	if (eventd == NULL) {
+		return ENOMEM;
+	}
+
+	eventd->ev = ev;
+	eventd->config = config;
+
+	ret = run_proc_init(eventd, ev, &eventd->run_proc_ctx);
+	if (ret != 0) {
+		talloc_free(eventd);
+		return ret;
+	}
+
+	eventd->script_dir = path_etcdir_append(eventd, "events");
+	if (eventd->script_dir == NULL) {
+		talloc_free(eventd);
+		return ENOMEM;
+	}
+
+	/* FIXME
+	status = directory_exist(eventd->script_dir);
+	if (! status) {
+		talloc_free(eventd);
+		return EINVAL;
+	}
+	*/
+
+	debug_script = event_config_debug_script(config);
+	if (debug_script != NULL) {
+		eventd->debug_script = path_etcdir_append(eventd,
+							  debug_script);
+		if (eventd->debug_script == NULL) {
+			D_WARNING("Failed to set debug script to %s\n",
+				  debug_script);
+		}
+	}
+
+	*result = eventd;
+	return 0;
+}
+
+struct event_config *eventd_config(struct event_context *eventd)
+{
+	return eventd->config;
+}
+
+int eventd_run_ctx(struct event_context *eventd,
+		   const char *comp_name,
+		   struct run_event_context **result)
+{
+	struct event_component *comp;
+	int ret;
+
+	ret = eventd_component_add(eventd, comp_name, &comp);
+	if (ret != 0) {
+		return ret;
+	}
+
+	*result = comp->run_ctx;
+	return 0;
+}
+
+int eventd_set_event_result(struct event_context *eventd,
+			    const char *comp_name,
+			    const char *event_name,
+			    struct run_event_script_list *script_list)
+{
+	struct event_component *comp;
+
+	comp = eventd_component_find(eventd, comp_name);
+	if (comp == NULL) {
+		return ENOENT;
+	}
+
+	return eventd_event_set(comp, event_name, script_list);
+}
+
+int eventd_get_event_result(struct event_context *eventd,
+			    const char *comp_name,
+			    const char *event_name,
+			    struct run_event_script_list **result)
+{
+	struct event_component *comp;
+	int ret;
+
+	ret = eventd_component_add(eventd, comp_name, &comp);
+	if (ret != 0) {
+		return ret;
+	}
+
+	return eventd_event_get(comp, event_name, result);
+}
+
+struct ctdb_event_script_list *eventd_script_list(
+				TALLOC_CTX *mem_ctx,
+				struct run_event_script_list *script_list)
+{
+	struct ctdb_event_script_list *value;
+	int num_scripts = 0;
+	int i;
+
+	value = talloc_zero(mem_ctx, struct ctdb_event_script_list);
+	if (value == NULL) {
+		return NULL;
+	}
+
+	if (script_list != NULL) {
+		num_scripts = script_list->num_scripts;
+	}
+
+	if (num_scripts <= 0) {
+		return value;
+	}
+
+	value->script = talloc_array(value,
+				     struct ctdb_event_script,
+				     num_scripts);
+	if (value->script == NULL) {
+		goto fail;
+	}
+
+	for (i=0; i<num_scripts; i++) {
+		struct run_event_script *rscript = &script_list->script[i];
+		struct ctdb_event_script *escript = &value->script[i];
+
+		escript->name = talloc_strdup(value, rscript->name);
+		if (escript->name == NULL) {
+			goto fail;
+		}
+
+		escript->begin = rscript->begin;
+		escript->end = rscript->end;
+		escript->result = rscript->summary;
+
+		if (rscript->output == NULL) {
+			escript->output = NULL;
+			continue;
+		}
+
+		escript->output = talloc_strdup(value, rscript->output);
+		if (escript->output == NULL) {
+			goto fail;
+		}
+	}
+	value->num_scripts = num_scripts;
+
+	return value;
+
+fail:
+	talloc_free(value);
+	return NULL;
+}
diff --git a/ctdb/event/event_daemon.c b/ctdb/event/event_daemon.c
new file mode 100644
index 00000000000..63c4dad2866
--- /dev/null
+++ b/ctdb/event/event_daemon.c
@@ -0,0 +1,359 @@
+/*
+   CTDB event daemon
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+
+#include <popt.h>
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+#include "common/path.h"
+#include "common/sock_daemon.h"
+
+#include "event/event_private.h"
+
+struct event_daemon_state {
+	TALLOC_CTX *mem_ctx;
+	char *socket;
+	char *pidfile;
+	struct tevent_context *ev;
+	struct event_config *config;
+	struct sock_daemon_context *sockd;
+	struct event_context *eventd;
+};
+
+static int event_daemon_startup(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = event_context_init(e_state,
+				 e_state->ev,
+				 e_state->config,
+				 &e_state->eventd);
+	if (ret != 0) {
+		D_ERR("Failed to initialize event context\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int event_daemon_reconfigure(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = event_config_reload(e_state->config);
+	if (ret != 0) {
+		D_WARNING("Configuration reload failed\n");
+	}
+
+	return 0;
+}
+
+static void event_daemon_shutdown(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+
+	TALLOC_FREE(e_state->eventd);
+}
+
+static bool event_client_connect(struct sock_client_context *client,
+				 pid_t pid,
+				 void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = eventd_client_add(e_state->eventd, client);
+	if (ret != 0) {
+		D_ERR("Failed to register client, ret=%d\n", ret);
+		return false;
+	}
+
+	return true;
+}
+
+static void event_client_disconnect(struct sock_client_context *client,
+				    void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+
+	eventd_client_del(e_state->eventd, client);
+}
+
+struct event_client_state {
+	struct tevent_context *ev;
+	struct event_context *eventd;
+	struct sock_client_context *client;
+	uint8_t *buf;
+	size_t buflen;
+};
+
+static void event_client_request_done(struct tevent_req *subreq);
+static void event_client_reply_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_client_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct sock_client_context *client,
+					    uint8_t *buf,
+					    size_t buflen,
+					    void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	struct tevent_req *req, *subreq;
+	struct event_client_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_client_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+	state->eventd = e_state->eventd;
+	state->client = client;
+
+	subreq = event_pkt_send(state, ev, e_state->eventd, buf, buflen);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_client_request_done, req);
+
+	return req;
+}
+
+static void event_client_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_client_state *state = tevent_req_data(
+		req, struct event_client_state);
+	int ret = 0;
+	bool ok;
+
+	ok = event_pkt_recv(subreq, &ret, state, &state->buf, &state->buflen);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ok = eventd_client_exists(state->eventd, state->client);
+	if (!ok) {
+		/* Client has already disconnected */
+		talloc_free(state->buf);
+		tevent_req_done(req);
+		return;
+	}
+
+	subreq = sock_socket_write_send(state,
+					state->ev,
+					state->client,
+					state->buf,
+					state->buflen);
+	if (tevent_req_nomem(subreq, req)) {
+		talloc_free(state->buf);
+		return;
+	}
+	tevent_req_set_callback(subreq, event_client_reply_done, req);
+}
+
+static void event_client_reply_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_client_state *state = tevent_req_data(
+		req, struct event_client_state);
+	int ret = 0;
+	bool ok;
+
+	talloc_free(state->buf);
+
+	ok = sock_socket_write_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		D_ERR("Sending reply failed\n");
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+static bool event_client_recv(struct tevent_req *req, int *perr)
+{
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	return true;
+}
+
+static struct {
+	int pid;
+} options = {
+	.pid = -1,
+};
+
+struct poptOption cmdline_options[] = {
+	POPT_AUTOHELP
+	{ "pid", 'P', POPT_ARG_INT, &options.pid, 0,
+		"pid to wait for", "PID" },
+	POPT_TABLEEND
+};
+
+int main(int argc, const char **argv)
+{
+	poptContext pc;
+	struct event_daemon_state *e_state;
+	struct sock_daemon_funcs daemon_funcs;
+	struct sock_socket_funcs socket_funcs;
+	const char *log_location = "file:";
+	const char *log_level = "NOTICE";
+	const char *t;
+	int interactive = 0;
+	int opt, ret;
+
+	pc = poptGetContext(argv[0],
+			    argc,
+			    argv,
+			    cmdline_options,
+			    0);
+	while ((opt = poptGetNextOpt(pc)) != -1) {
+		D_ERR("Invalid options %s: %s\n",
+		      poptBadOption(pc, 0),
+		      poptStrerror(opt));
+		exit(1);
+	}
+
+	t = getenv("CTDB_INTERACTIVE");
+	if (t != NULL) {
+		interactive = 1;
+	}
+
+	e_state = talloc_zero(NULL, struct event_daemon_state);
+	if (e_state == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->mem_ctx = talloc_new(e_state);
+	if (e_state->mem_ctx == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->socket = path_socket(e_state, "eventd");
+	if (e_state->socket == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->pidfile = path_pidfile(e_state, "eventd");
+	if (e_state->pidfile == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	ret = event_config_init(e_state, &e_state->config);
+	if (ret != 0) {
+		D_ERR("Failed to initalize event config\n");
+		goto fail;
+	}
+
+	e_state->ev = tevent_context_init(e_state->mem_ctx);
+	if (e_state->ev == NULL) {
+		D_ERR("Failed to initalize tevent\n");
+		ret = 1;
+		goto fail;
+	}
+
+	daemon_funcs = (struct sock_daemon_funcs) {
+		.startup = event_daemon_startup,
+		.reconfigure = event_daemon_reconfigure,
+		.shutdown = event_daemon_shutdown,
+	};
+
+	if (interactive == 0) {
+		log_location = event_config_log_location(e_state->config);
+		log_level = event_config_log_level(e_state->config);
+	}
+
+	ret = sock_daemon_setup(e_state->mem_ctx,
+				"ctdb-eventd",
+				log_location,
+				log_level,
+				&daemon_funcs,
+				e_state,
+				&e_state->sockd);
+	if (ret != 0) {
+		D_ERR("Failed to setup sock daemon\n");
+		goto fail;
+	}
+
+	socket_funcs = (struct sock_socket_funcs) {
+		.connect = event_client_connect,
+		.disconnect = event_client_disconnect,
+		.read_send = event_client_send,
+		.read_recv = event_client_recv,
+	};
+
+	ret = sock_daemon_add_unix(e_state->sockd,
+				   e_state->socket,
+				   &socket_funcs,
+				   e_state);
+	if (ret != 0) {
+		D_ERR("Failed to setup socket %s\n", e_state->socket);
+		goto fail;
+	}
+
+	ret = sock_daemon_run(e_state->ev,
+			      e_state->sockd,
+			      e_state->pidfile,
+			      (interactive == 1),
+			      false,
+			      options.pid);
+	if (ret == EINTR) {
+		ret = 0;
+	}
+
+	if (getenv("CTDB_TEST_MODE") != NULL) {
+		talloc_report_full(e_state->mem_ctx, stderr);
+	}
+
+fail:
+	talloc_free(e_state);
+	(void)poptFreeContext(pc);
+	exit(ret);
+}
diff --git a/ctdb/event/event_private.h b/ctdb/event/event_private.h
new file mode 100644
index 00000000000..0cc8d803f5b
--- /dev/null
+++ b/ctdb/event/event_private.h
@@ -0,0 +1,103 @@
+/*
+   CTDB event daemon
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CTDB_EVENT_PRIVATE_H__
+#define __CTDB_EVENT_PRIVATE_H__
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "common/run_event.h"
+#include "common/sock_daemon.h"
+
+#include "event/event_protocol.h"
+
+struct event_config;
+struct event_context;
+
+/* From event/event_cmd.c */
+
+struct tevent_req *event_cmd_dispatch_send(
+					TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct event_context *eventd,
+					struct ctdb_event_request *request);
+bool event_cmd_dispatch_recv(struct tevent_req *req,
+			     int *perr,
+			     TALLOC_CTX *mem_ctx,
+			     struct ctdb_event_reply **reply);
+
+/* From event/event_config.c */
+
+int event_config_init(TALLOC_CTX *mem_ctx, struct event_config **result);
+
+const char *event_config_log_location(struct event_config *config);
+const char *event_config_log_level(struct event_config *config);
+const char *event_config_debug_script(struct event_config *config);
+
+int event_config_reload(struct event_config *config);
+
+/* From event/event_context.c */
+
+int eventd_client_add(struct event_context *eventd,
+		      struct sock_client_context *client);
+void eventd_client_del(struct event_context *eventd,
+		       struct sock_client_context *client);
+bool eventd_client_exists(struct event_context *eventd,
+			  struct sock_client_context *client);
+
+int event_context_init(TALLOC_CTX *mem_ctx,
+		       struct tevent_context *ev,
+		       struct event_config *config,
+		       struct event_context **result);
+
+struct event_config *eventd_config(struct event_context *eventd);
+int eventd_run_ctx(struct event_context *eventd,
+		   const char *comp_name,
+		   struct run_event_context **result);
+
+int eventd_set_event_result(struct event_context *eventd,
+			    const char *comp_name,
+			    const char *event_name,
+			    struct run_event_script_list *script_list);
+int eventd_get_event_result(struct event_context *eventd,
+			    const char *comp_name,
+			    const char *event_name,
+			    struct run_event_script_list **result);
+
+struct ctdb_event_script_list *eventd_script_list(
+				TALLOC_CTX *mem_ctx,
+				struct run_event_script_list *script_list);
+
+
+/* From event/event_request.c */
+
+struct tevent_req *event_pkt_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct event_context *eventd,
+				     uint8_t *buf,
+				     size_t buflen);
+
+bool event_pkt_recv(struct tevent_req *req,
+		    int *perr,
+		    TALLOC_CTX *mem_ctx,
+		    uint8_t **buf,
+		    size_t *buflen);
+
+#endif /* __CTDB_EVENT_PRIVATE_H__ */
diff --git a/ctdb/event/event_request.c b/ctdb/event/event_request.c
new file mode 100644
index 00000000000..303e73524bb
--- /dev/null
+++ b/ctdb/event/event_request.c
@@ -0,0 +1,217 @@
+/*
+   CTDB event daemon - handle requests
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+
+#include "lib/util/debug.h"
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+
+#include "event/event_private.h"
+#include "event/event_protocol_api.h"
+
+struct event_request_state {
+	struct ctdb_event_request *request;
+	struct ctdb_event_reply *reply;
+};
+
+static void event_request_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_request_send(
+					TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct event_context *eventd,
+					struct ctdb_event_header *header,
+					struct ctdb_event_request *request)
+{
+	struct tevent_req *req, *subreq;
+	struct event_request_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_request_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->request = request;
+
+	subreq = event_cmd_dispatch_send(state, ev, eventd, request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_request_done, req);
+
+	return req;
+}
+
+static void event_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_request_state *state = tevent_req_data(
+		req, struct event_request_state);
+	int ret;
+	bool ok;
+
+	ok = event_cmd_dispatch_recv(subreq, &ret, state, &state->reply);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		D_ERR("Command %s failed, ret=%d\n",
+		      ctdb_event_command_to_string(state->request->cmd), ret);
+
+		state->reply = talloc_zero(state, struct ctdb_event_reply);
+		if (tevent_req_nomem(state->reply, req)) {
+			return;
+		}
+
+		state->reply->cmd = state->request->cmd;
+		state->reply->result = EIO;
+	}
+
+	tevent_req_done(req);
+}
+
+static bool event_request_recv(struct tevent_req *req,
+			       int *perr,
+			       TALLOC_CTX *mem_ctx,
+			       struct ctdb_event_reply **reply)
+{
+	struct event_request_state *state = tevent_req_data(
+		req, struct event_request_state);
+
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	*reply = talloc_steal(mem_ctx, state->reply);
+
+	return true;
+}
+
+struct event_pkt_state {
+	struct ctdb_event_header header;
+	struct ctdb_event_request *request;
+	uint8_t *buf;
+	size_t buflen;
+};
+
+static void event_pkt_done(struct tevent_req *subreq);
+
+struct tevent_req *event_pkt_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct event_context *eventd,
+				  uint8_t *buf,
+				  size_t buflen)
+{
+	struct tevent_req *req, *subreq;
+	struct event_pkt_state *state;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_pkt_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	ret = ctdb_event_request_pull(buf,
+				      buflen,
+				      &state->header,
+				      state,
+				      &state->request);
+	if (ret != 0) {
+		/* Ignore invalid packets */
+		D_ERR("Invalid packet received, buflen=%zu\n", buflen);
+		tevent_req_error(req, EPROTO);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = event_request_send(state,
+				  ev,
+				  eventd,
+				  &state->header,
+				  state->request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_pkt_done, req);
+
+	return req;
+}
+
+static void event_pkt_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_pkt_state *state = tevent_req_data(
+		req, struct event_pkt_state);
+	struct ctdb_event_header header;
+	struct ctdb_event_reply *reply;
+	int ret;
+	bool ok;
+
+	ok = event_request_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	TALLOC_FREE(state->request);
+	if (!ok) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	header = (struct ctdb_event_header) {
+		.reqid = state->header.reqid,
+	};
+
+	state->buflen = ctdb_event_reply_len(&header, reply);
+	state->buf = talloc_zero_size(state, state->buflen);
+	if (tevent_req_nomem(state->buf, req)) {
+		talloc_free(reply);
+		return;
+	}
+
+	ret = ctdb_event_reply_push(&header,
+				    reply,
+				    state->buf,
+				    &state->buflen);
+	talloc_free(reply);
+	if (ret != 0) {
+		talloc_free(state->buf);
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool event_pkt_recv(struct tevent_req *req,
+		    int *perr,
+		    TALLOC_CTX *mem_ctx,
+		    uint8_t **buf,
+		    size_t *buflen)
+{
+	struct event_pkt_state *state = tevent_req_data(
+		req, struct event_pkt_state);
+
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	*buf = talloc_steal(mem_ctx, state->buf);
+	*buflen = state->buflen;
+
+	return true;
+}