wrepl_out_helpers.c

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failed:
	talloc_free(c);
	return NULL;
}

static NTSTATUS wreplsrv_pull_table_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
					 struct wreplsrv_pull_table_io *io)
{
	NTSTATUS status;

	status = composite_wait(c);

	if (NT_STATUS_IS_OK(status)) {
		struct wreplsrv_pull_table_state *state = talloc_get_type(c->private_data,
							  struct wreplsrv_pull_table_state);
		io->out.num_owners	= state->table_io.out.num_partners;
		io->out.owners		= talloc_reference(mem_ctx, state->table_io.out.partners);
	}

	talloc_free(c);
	return status;	
}

struct wreplsrv_pull_names_io {
	struct {
		struct wreplsrv_partner *partner;
		struct wreplsrv_out_connection *wreplconn;
		struct wrepl_wins_owner owner;
	} in;
	struct {
		uint32_t num_names;
		struct wrepl_name *names;
	} out;
};

enum wreplsrv_pull_names_stage {
	WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION,
	WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY,
	WREPLSRV_PULL_NAMES_STAGE_DONE
};

struct wreplsrv_pull_names_state {
	enum wreplsrv_pull_names_stage stage;
	struct composite_context *c;
	struct wrepl_request *req;
	struct wrepl_pull_names pull_io;
	struct wreplsrv_pull_names_io *io;
	struct composite_context *creq;
	struct wreplsrv_out_connection *wreplconn;
};

static void wreplsrv_pull_names_handler_req(struct wrepl_request *req);

static NTSTATUS wreplsrv_pull_names_wait_connection(struct wreplsrv_pull_names_state *state)
{
	NTSTATUS status;

	status = wreplsrv_out_connect_recv(state->creq, state, &state->wreplconn);
	NT_STATUS_NOT_OK_RETURN(status);

	state->pull_io.in.assoc_ctx	= state->wreplconn->assoc_ctx.peer_ctx;
	state->pull_io.in.partner	= state->io->in.owner;
	state->req = wrepl_pull_names_send(state->wreplconn->sock, &state->pull_io);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	state->req->async.fn		= wreplsrv_pull_names_handler_req;
	state->req->async.private	= state;

	state->stage = WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY;

	return NT_STATUS_OK;
}

static NTSTATUS wreplsrv_pull_names_wait_send_reply(struct wreplsrv_pull_names_state *state)
{
	NTSTATUS status;

	status = wrepl_pull_names_recv(state->req, state, &state->pull_io);
	NT_STATUS_NOT_OK_RETURN(status);

	state->stage = WREPLSRV_PULL_NAMES_STAGE_DONE;

	return NT_STATUS_OK;
}

static void wreplsrv_pull_names_handler(struct wreplsrv_pull_names_state *state)
{
	struct composite_context *c = state->c;

	switch (state->stage) {
	case WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION:
		c->status = wreplsrv_pull_names_wait_connection(state);
		break;
	case WREPLSRV_PULL_NAMES_STAGE_WAIT_SEND_REPLY:
		c->status = wreplsrv_pull_names_wait_send_reply(state);
		c->state  = COMPOSITE_STATE_DONE;
		break;
	case WREPLSRV_PULL_NAMES_STAGE_DONE:
		c->status = NT_STATUS_INTERNAL_ERROR;
	}

	if (!NT_STATUS_IS_OK(c->status)) {
		c->state = COMPOSITE_STATE_ERROR;
	}

	if (c->state >= COMPOSITE_STATE_DONE && c->async.fn) {
		c->async.fn(c);
	}
}

static void wreplsrv_pull_names_handler_creq(struct composite_context *creq)
{
	struct wreplsrv_pull_names_state *state = talloc_get_type(creq->async.private_data,
						  struct wreplsrv_pull_names_state);
	wreplsrv_pull_names_handler(state);
	return;
}

static void wreplsrv_pull_names_handler_req(struct wrepl_request *req)
{
	struct wreplsrv_pull_names_state *state = talloc_get_type(req->async.private,
						  struct wreplsrv_pull_names_state);
	wreplsrv_pull_names_handler(state);
	return;
}

static struct composite_context *wreplsrv_pull_names_send(TALLOC_CTX *mem_ctx, struct wreplsrv_pull_names_io *io)
{
	struct composite_context *c = NULL;
	struct wreplsrv_service *service = io->in.partner->service;
	struct wreplsrv_pull_names_state *state = NULL;
	enum winsrepl_partner_type partner_type = WINSREPL_PARTNER_PULL;

	if (io->in.wreplconn) partner_type = WINSREPL_PARTNER_NONE;

	c = talloc_zero(mem_ctx, struct composite_context);
	if (!c) goto failed;

	state = talloc_zero(c, struct wreplsrv_pull_names_state);
	if (!state) goto failed;
	state->c	= c;
	state->io	= io;

	c->state	= COMPOSITE_STATE_IN_PROGRESS;
	c->event_ctx	= service->task->event_ctx;
	c->private_data	= state;

	state->stage	= WREPLSRV_PULL_NAMES_STAGE_WAIT_CONNECTION;
	state->creq	= wreplsrv_out_connect_send(io->in.partner, partner_type, io->in.wreplconn);
	if (!state->creq) goto failed;

	state->creq->async.fn		= wreplsrv_pull_names_handler_creq;
	state->creq->async.private_data	= state;

	return c;
failed:
	talloc_free(c);
	return NULL;
}

static NTSTATUS wreplsrv_pull_names_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
					 struct wreplsrv_pull_names_io *io)
{
	NTSTATUS status;

	status = composite_wait(c);

	if (NT_STATUS_IS_OK(status)) {
		struct wreplsrv_pull_names_state *state = talloc_get_type(c->private_data,
							  struct wreplsrv_pull_names_state);
		io->out.num_names	= state->pull_io.out.num_names;
		io->out.names		= talloc_reference(mem_ctx, state->pull_io.out.names);
	}

	talloc_free(c);
	return status;
	
}

enum wreplsrv_pull_cycle_stage {
	WREPLSRV_PULL_CYCLE_STAGE_WAIT_TABLE_REPLY,
	WREPLSRV_PULL_CYCLE_STAGE_WAIT_SEND_REPLIES,
	WREPLSRV_PULL_CYCLE_STAGE_WAIT_STOP_ASSOC,
	WREPLSRV_PULL_CYCLE_STAGE_DONE
};

struct wreplsrv_pull_cycle_state {
	enum wreplsrv_pull_cycle_stage stage;
	struct composite_context *c;
	struct wreplsrv_pull_cycle_io *io;
	struct wreplsrv_pull_table_io table_io;
	uint32_t current;
	struct wreplsrv_pull_names_io names_io;
	struct composite_context *creq;
	struct wrepl_associate_stop assoc_stop_io;
	struct wrepl_request *req;
};

static void wreplsrv_pull_cycle_handler_creq(struct composite_context *creq);
static void wreplsrv_pull_cycle_handler_req(struct wrepl_request *req);

static NTSTATUS wreplsrv_pull_cycle_next_owner_do_work(struct wreplsrv_pull_cycle_state *state)
{
	struct wreplsrv_owner *current_owner=NULL;
	struct wreplsrv_owner *local_owner;
	uint32_t i;
	uint64_t old_max_version = 0;
	bool do_pull = false;

	for (i=state->current; i < state->table_io.out.num_owners; i++) {
		current_owner = wreplsrv_find_owner(state->io->in.partner->service,
						    state->io->in.partner->pull.table,
						    state->table_io.out.owners[i].address);

		local_owner = wreplsrv_find_owner(state->io->in.partner->service,
						  state->io->in.partner->service->table,
						  state->table_io.out.owners[i].address);
		/*
		 * this means we are ourself the current owner,
		 * and we don't want replicate ourself
		 */
		if (!current_owner) continue;

		/*
		 * this means we don't have any records of this owner
		 * so fetch them
		 */
		if (!local_owner) {
			do_pull		= true;
			
			break;
		}

		/*
		 * this means the remote partner has some new records of this owner
		 * fetch them
		 */
		if (current_owner->owner.max_version > local_owner->owner.max_version) {
			do_pull		= true;
			old_max_version	= local_owner->owner.max_version;
			break;
		}
	}
	state->current = i;

	if (do_pull) {
		state->names_io.in.partner		= state->io->in.partner;
		state->names_io.in.wreplconn		= state->io->in.wreplconn;
		state->names_io.in.owner		= current_owner->owner;
		state->names_io.in.owner.min_version	= old_max_version + 1;
		state->creq = wreplsrv_pull_names_send(state, &state->names_io);
		NT_STATUS_HAVE_NO_MEMORY(state->creq);

		state->creq->async.fn		= wreplsrv_pull_cycle_handler_creq;
		state->creq->async.private_data	= state;

		return STATUS_MORE_ENTRIES;
	}

	return NT_STATUS_OK;
}

static NTSTATUS wreplsrv_pull_cycle_next_owner_wrapper(struct wreplsrv_pull_cycle_state *state)
{
	NTSTATUS status;

	status = wreplsrv_pull_cycle_next_owner_do_work(state);
	if (NT_STATUS_IS_OK(status)) {
		state->stage = WREPLSRV_PULL_CYCLE_STAGE_DONE;
	} else if (NT_STATUS_EQUAL(STATUS_MORE_ENTRIES, status)) {
		state->stage = WREPLSRV_PULL_CYCLE_STAGE_WAIT_SEND_REPLIES;
		status = NT_STATUS_OK;
	}

	if (state->stage == WREPLSRV_PULL_CYCLE_STAGE_DONE && state->io->in.wreplconn) {
		state->assoc_stop_io.in.assoc_ctx	= state->io->in.wreplconn->assoc_ctx.peer_ctx;
		state->assoc_stop_io.in.reason		= 0;
		state->req = wrepl_associate_stop_send(state->io->in.wreplconn->sock, &state->assoc_stop_io);
		NT_STATUS_HAVE_NO_MEMORY(state->req);

		state->req->async.fn		= wreplsrv_pull_cycle_handler_req;
		state->req->async.private	= state;

		state->stage = WREPLSRV_PULL_CYCLE_STAGE_WAIT_STOP_ASSOC;
	}

	return status;
}

static NTSTATUS wreplsrv_pull_cycle_wait_table_reply(struct wreplsrv_pull_cycle_state *state)
{
	NTSTATUS status;
	uint32_t i;

	status = wreplsrv_pull_table_recv(state->creq, state, &state->table_io);
	NT_STATUS_NOT_OK_RETURN(status);

	/* update partner table */
	for (i=0; i < state->table_io.out.num_owners; i++) {
		status = wreplsrv_add_table(state->io->in.partner->service,
					    state->io->in.partner, 
					    &state->io->in.partner->pull.table,
					    state->table_io.out.owners[i].address,
					    state->table_io.out.owners[i].max_version);
		NT_STATUS_NOT_OK_RETURN(status);
	}

	status = wreplsrv_pull_cycle_next_owner_wrapper(state);
	NT_STATUS_NOT_OK_RETURN(status);

	return status;
}

static NTSTATUS wreplsrv_pull_cycle_apply_records(struct wreplsrv_pull_cycle_state *state)
{
	NTSTATUS status;

	status = wreplsrv_apply_records(state->io->in.partner,
					&state->names_io.in.owner,
					state->names_io.out.num_names,
					state->names_io.out.names);
	NT_STATUS_NOT_OK_RETURN(status);

	talloc_free(state->names_io.out.names);
	ZERO_STRUCT(state->names_io);

	return NT_STATUS_OK;
}

static NTSTATUS wreplsrv_pull_cycle_wait_send_replies(struct wreplsrv_pull_cycle_state *state)
{
	NTSTATUS status;

	status = wreplsrv_pull_names_recv(state->creq, state, &state->names_io);
	NT_STATUS_NOT_OK_RETURN(status);

	/*
	 * TODO: this should maybe an async call,
	 *       because we may need some network access
	 *       for conflict resolving
	 */
	status = wreplsrv_pull_cycle_apply_records(state);
	NT_STATUS_NOT_OK_RETURN(status);

	status = wreplsrv_pull_cycle_next_owner_wrapper(state);
	NT_STATUS_NOT_OK_RETURN(status);

	return status;
}

static NTSTATUS wreplsrv_pull_cycle_wait_stop_assoc(struct wreplsrv_pull_cycle_state *state)
{
	NTSTATUS status;

	status = wrepl_associate_stop_recv(state->req, &state->assoc_stop_io);
	NT_STATUS_NOT_OK_RETURN(status);

	state->stage = WREPLSRV_PULL_CYCLE_STAGE_DONE;

	return status;
}

static void wreplsrv_pull_cycle_handler(struct wreplsrv_pull_cycle_state *state)
{
	struct composite_context *c = state->c;

	switch (state->stage) {
	case WREPLSRV_PULL_CYCLE_STAGE_WAIT_TABLE_REPLY: