/* 
   Unix SMB/CIFS implementation.

   helper functions for task based servers (nbtd, winbind etc)

   Copyright (C) Andrew Tridgell 2005
   
   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 "includes.h"
#include "process_model.h"
#include "lib/messaging/irpc.h"
#include "param/param.h"
#include "librpc/gen_ndr/ndr_irpc_c.h"

/*
  terminate a task service
*/
void task_server_terminate(struct task_server *task, const char *reason, bool fatal)
{
	struct tevent_context *event_ctx = task->event_ctx;
	const struct model_ops *model_ops = task->model_ops;
	if (fatal) {
		DBG_ERR("task_server_terminate: [%s]\n", reason);
	} else {
		DBG_NOTICE("task_server_terminate: [%s]\n", reason);
	}

	if (fatal && task->msg_ctx != NULL) {
		struct dcerpc_binding_handle *irpc_handle;
		struct samba_terminate r;

		irpc_handle = irpc_binding_handle_by_name(task, task->msg_ctx,
							  "samba", &ndr_table_irpc);
		if (irpc_handle != NULL) {
			/* Note: this makes use of nested event loops... */
			dcerpc_binding_handle_set_sync_ev(irpc_handle, event_ctx);
			r.in.reason = reason;
			dcerpc_samba_terminate_r(irpc_handle, task, &r);
		}
	}

	imessaging_cleanup(task->msg_ctx);

	model_ops->terminate_task(
	    event_ctx, task->lp_ctx, reason, fatal, task->process_context);
	/* don't free this above, it might contain the 'reason' being printed */
	talloc_free(task);
}

/* used for the callback from the process model code */
struct task_state {
	const struct service_details *service_details;
	const struct model_ops *model_ops;
};


/*
  called by the process model code when the new task starts up. This then calls
  the server specific startup code
*/
static struct task_server *task_server_callback(struct tevent_context *event_ctx,
				 struct loadparm_context *lp_ctx,
				 struct server_id server_id,
				 void *private_data,
				 void *context)
{
	struct task_server *task;
	NTSTATUS status = NT_STATUS_OK;

	struct task_state *state = talloc_get_type(private_data, struct task_state);
	task = talloc(event_ctx, struct task_server);
	if (task == NULL) return NULL;

	task->event_ctx = event_ctx;
	task->model_ops = state->model_ops;
	task->server_id = server_id;
	task->lp_ctx = lp_ctx;
	task->process_context = context;

	task->msg_ctx = imessaging_init(task,
					task->lp_ctx,
					task->server_id,
					task->event_ctx);
	if (!task->msg_ctx) {
		task_server_terminate(task, "imessaging_init() failed", true);
		return NULL;
	}

	status = state->service_details->task_init(task);
	if (!NT_STATUS_IS_OK(status)) {
		return NULL;
	}
	return task;
}

/*
  startup a task based server
*/
NTSTATUS task_server_startup(struct tevent_context *event_ctx,
			     struct loadparm_context *lp_ctx,
			     const char *service_name,
			     const struct model_ops *model_ops,
			     const struct service_details *service_details,
			     int from_parent_fd)
{
	struct task_state *state;

	state = talloc(event_ctx, struct task_state);
	NT_STATUS_HAVE_NO_MEMORY(state);

	state->service_details = service_details;
	state->model_ops = model_ops;

	state->model_ops->new_task(event_ctx, lp_ctx, service_name,
			           task_server_callback, state, service_details,
				   from_parent_fd);

	return NT_STATUS_OK;
}

/*
  setup a task title 
*/
void task_server_set_title(struct task_server *task, const char *title)
{
	task->model_ops->set_title(task->event_ctx, title);
}