X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fafb-stub-ws.c;h=11cad076913e60b61c5dfb2eae145933cef66773;hb=65353dce81a629e042800bb7b86fcd869a76727e;hp=c7b4b2ecf736d242e3ce7465cd85f69d6d8a72ee;hpb=090379fdaf6ed1860dcff21424135ad71ead0cd2;p=src%2Fapp-framework-binder.git

diff --git a/src/afb-stub-ws.c b/src/afb-stub-ws.c
index c7b4b2ec..11cad076 100644
--- a/src/afb-stub-ws.c
+++ b/src/afb-stub-ws.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015, 2016, 2017 "IoT.bzh"
+ * Copyright (C) 2015-2020 "IoT.bzh"
  * Author José Bollo <jose.bollo@iot.bzh>
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,8 +17,6 @@
 
 #define _GNU_SOURCE
 
-#define NO_PLUGIN_VERBOSE_MACRO
-
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
@@ -33,264 +31,111 @@
 #include <pthread.h>
 
 #include <json-c/json.h>
-#include <systemd/sd-event.h>
-
-#include <afb/afb-req-itf.h>
 
-#include "afb-common.h"
+#include <afb/afb-event-x2.h>
 
 #include "afb-session.h"
 #include "afb-cred.h"
-#include "afb-ws.h"
-#include "afb-msg-json.h"
 #include "afb-api.h"
 #include "afb-apiset.h"
+#include "afb-proto-ws.h"
 #include "afb-stub-ws.h"
 #include "afb-context.h"
 #include "afb-evt.h"
 #include "afb-xreq.h"
+#include "afb-token.h"
+#include "afb-error-text.h"
 #include "verbose.h"
+#include "fdev.h"
+#include "jobs.h"
+#include "u16id.h"
 
-struct client_call;
-struct client_event;
 struct afb_stub_ws;
 
-/************** constants for protocol definition *************************/
-
-#define CHAR_FOR_CALL             'C'
-#define CHAR_FOR_ANSWER_SUCCESS   'T'
-#define CHAR_FOR_ANSWER_FAIL      'F'
-#define CHAR_FOR_EVT_BROADCAST    '*'
-#define CHAR_FOR_EVT_ADD          '+'
-#define CHAR_FOR_EVT_DEL          '-'
-#define CHAR_FOR_EVT_PUSH         '!'
-#define CHAR_FOR_EVT_SUBSCRIBE    'S'
-#define CHAR_FOR_EVT_UNSUBSCRIBE  'U'
-#define CHAR_FOR_SUBCALL_CALL     'B'
-#define CHAR_FOR_SUBCALL_REPLY    'R'
-
-/******************* handling subcalls *****************************/
-
-/**
- * Structure on server side for recording pending
- * subcalls.
- */
-struct server_subcall
-{
-	struct server_subcall *next;	/**< next subcall for the client */
-	uint32_t subcallid;		/**< the subcallid */
-	void (*callback)(void*, int, struct json_object*); /**< callback on completion */
-	void *closure;			/**< closure of the callback */
-};
-
 /**
- * Structure for sending back replies on client side
- */
-struct client_subcall
-{
-	struct afb_stub_ws *stubws;	/**< stub descriptor */
-	uint32_t subcallid;		/**< subcallid for the reply */
-};
-
-/*
- * structure for recording calls on client side
- */
-struct client_call {
-	struct client_call *next;	/* the next call */
-	struct afb_stub_ws *stubws;	/* the stub_ws */
-	struct afb_xreq *xreq;		/* the request handle */
-	uint32_t msgid;			/* the message identifier */
-};
-
-/*
- * structure for a ws request
+ * structure for a ws request: requests on server side
  */
 struct server_req {
-	struct afb_xreq xreq;		/* the xreq */
-	struct afb_stub_ws *stubws;	/* the client of the request */
-	uint32_t msgid;			/* the incoming request msgid */
+	struct afb_xreq xreq;		/**< the xreq */
+	struct afb_stub_ws *stubws;	/**< the client of the request */
+	struct afb_proto_ws_call *call;	/**< the incoming call */
 };
 
-/*
- * structure for recording events on client side
+/**
+ * structure for jobs of describing
  */
-struct client_event
+struct server_describe
 {
-	struct client_event *next;
-	struct afb_event event;
-	int eventid;
-	int refcount;
+	struct afb_stub_ws *stubws;
+	struct afb_proto_ws_describe *describe;
 };
 
-/******************* client description part for server *****************************/
+/******************* stub description for client or servers ******************/
 
 struct afb_stub_ws
 {
-	/* count of references */
-	int refcount;
-
-	/* file descriptor */
-	int fd;
-
-	/* resource control */
-	pthread_mutex_t mutex;
-
-	/* websocket */
-	struct afb_ws *ws;
-
-	/* listener for events (server side) */
-	struct afb_evt_listener *listener;
-
-	/* event replica (client side) */
-	struct client_event *events;
-
-	/* emitted calls (client side) */
-	struct client_call *calls;
-
-	/* credentials (server side) */
-	struct afb_cred *cred;
-
-	/* pending subcalls (server side) */
-	struct server_subcall *subcalls;
+	/* protocol */
+	struct afb_proto_ws *proto;
 
 	/* apiset */
 	struct afb_apiset *apiset;
 
-	/* the api name */
-	char apiname[1];
-};
+	/* on hangup callback */
+	void (*on_hangup)(struct afb_stub_ws *);
 
-/******************* common useful tools **********************************/
+	union {
+		/* server side */
+		struct {
+			/* listener for events */
+			struct afb_evt_listener *listener;
 
-/**
- * translate a pointer to some integer
- * @param ptr the pointer to translate
- * @return an integer
- */
-static inline uint32_t ptr2id(void *ptr)
-{
-	return (uint32_t)(((intptr_t)ptr) >> 6);
-}
+			/* sessions */
+			struct server_session *sessions;
 
-/******************* serialisation part **********************************/
+			/* credentials of the client */
+			struct afb_cred *cred;
 
-struct readbuf
-{
-	char *head, *end;
-};
+			/* event from server */
+			struct u16id2bool *event_flags;
 
-#define WRITEBUF_COUNT_MAX  32
-struct writebuf
-{
-	struct iovec iovec[WRITEBUF_COUNT_MAX];
-	uint32_t uints[WRITEBUF_COUNT_MAX];
-	int count;
-};
+			/* transmitted sessions */
+			struct u16id2ptr *session_proxies;
 
-static char *readbuf_get(struct readbuf *rb, uint32_t length)
-{
-	char *before = rb->head;
-	char *after = before + length;
-	if (after > rb->end)
-		return 0;
-	rb->head = after;
-	return before;
-}
+			/* transmitted tokens */
+			struct u16id2ptr *token_proxies;
+		};
 
-static int readbuf_char(struct readbuf *rb, char *value)
-{
-	if (rb->head >= rb->end)
-		return 0;
-	*value = *rb->head++;
-	return 1;
-}
+		/* client side */
+		struct {
+			/* event from server */
+			struct u16id2ptr *event_proxies;
 
-static int readbuf_uint32(struct readbuf *rb, uint32_t *value)
-{
-	char *after = rb->head + sizeof *value;
-	if (after > rb->end)
-		return 0;
-	memcpy(value, rb->head, sizeof *value);
-	rb->head = after;
-	*value = le32toh(*value);
-	return 1;
-}
+			/* transmitted sessions */
+			struct u16id2bool *session_flags;
 
-static int readbuf_string(struct readbuf *rb, const char **value, size_t *length)
-{
-	uint32_t len;
-	if (!readbuf_uint32(rb, &len) || !len)
-		return 0;
-	if (length)
-		*length = (size_t)(len - 1);
-	return (*value = readbuf_get(rb, len)) != NULL &&  rb->head[-1] == 0;
-}
+			/* transmitted tokens */
+			struct u16id2bool *token_flags;
 
-static int readbuf_object(struct readbuf *rb, struct json_object **object)
-{
-	const char *string;
-	struct json_object *o;
-	int rc = readbuf_string(rb, &string, NULL);
-	if (rc) {
-		o = json_tokener_parse(string);
-		if (o == NULL && strcmp(string, "null"))
-			o = json_object_new_string(string);
-		*object = o;
-	}
-	return rc;
-}
+			/* robustify */
+			struct {
+				struct fdev *(*reopen)(void*);
+				void *closure;
+				void (*release)(void*);
+			} robust;
+		};
+	};
 
-static int writebuf_put(struct writebuf *wb, const void *value, size_t length)
-{
-	int i = wb->count;
-	if (i == WRITEBUF_COUNT_MAX)
-		return 0;
-	wb->iovec[i].iov_base = (void*)value;
-	wb->iovec[i].iov_len = length;
-	wb->count = i + 1;
-	return 1;
-}
-
-static int writebuf_char(struct writebuf *wb, char value)
-{
-	int i = wb->count;
-	if (i == WRITEBUF_COUNT_MAX)
-		return 0;
-	*(char*)&wb->uints[i] = value;
-	wb->iovec[i].iov_base = &wb->uints[i];
-	wb->iovec[i].iov_len = 1;
-	wb->count = i + 1;
-	return 1;
-}
+	/* count of references */
+	unsigned refcount;
 
-static int writebuf_uint32(struct writebuf *wb, uint32_t value)
-{
-	int i = wb->count;
-	if (i == WRITEBUF_COUNT_MAX)
-		return 0;
-	wb->uints[i] = htole32(value);
-	wb->iovec[i].iov_base = &wb->uints[i];
-	wb->iovec[i].iov_len = sizeof wb->uints[i];
-	wb->count = i + 1;
-	return 1;
-}
+	/* type of the stub: 0=server, 1=client */
+	uint8_t is_client;
 
-static int writebuf_string_length(struct writebuf *wb, const char *value, size_t length)
-{
-	uint32_t len = (uint32_t)++length;
-	return (size_t)len == length && len && writebuf_uint32(wb, len) && writebuf_put(wb, value, length);
-}
-
-static int writebuf_string(struct writebuf *wb, const char *value)
-{
-	return writebuf_string_length(wb, value, strlen(value));
-}
+	/* the api name */
+	char apiname[];
+};
 
-static int writebuf_object(struct writebuf *wb, struct json_object *object)
-{
-	const char *string = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
-	return string != NULL && writebuf_string(wb, string);
-}
+static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t server);
 
 /******************* ws request part for server *****************/
 
@@ -300,830 +145,588 @@ static void server_req_destroy_cb(struct afb_xreq *xreq)
 	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 
 	afb_context_disconnect(&wreq->xreq.context);
-	afb_cred_unref(wreq->xreq.cred);
 	json_object_put(wreq->xreq.json);
+	afb_proto_ws_call_unref(wreq->call);
 	afb_stub_ws_unref(wreq->stubws);
 	free(wreq);
 }
 
-static void server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info)
+static void server_req_reply_cb(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info)
 {
 	int rc;
-	struct writebuf wb = { .count = 0 };
 	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 
-	if (writebuf_char(&wb, CHAR_FOR_ANSWER_SUCCESS)
-	 && writebuf_uint32(&wb, wreq->msgid)
-	 && writebuf_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
-	 && writebuf_string(&wb, info ? : "")
-	 && writebuf_object(&wb, obj)) {
-		rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
-		if (rc >= 0)
-			goto success;
-	}
-	ERROR("error while sending success");
-success:
+	rc = afb_proto_ws_call_reply(wreq->call, obj, error, info);
+	if (rc < 0)
+		ERROR("error while sending reply");
 	json_object_put(obj);
 }
 
-static void server_req_fail_cb(struct afb_xreq *xreq, const char *status, const char *info)
-{
-	int rc;
-	struct writebuf wb = { .count = 0 };
-	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
-
-	if (writebuf_char(&wb, CHAR_FOR_ANSWER_FAIL)
-	 && writebuf_uint32(&wb, wreq->msgid)
-	 && writebuf_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
-	 && writebuf_string(&wb, status)
-	 && writebuf_string(&wb, info ? : "")) {
-		rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
-		if (rc >= 0)
-			return;
-	}
-	ERROR("error while sending fail");
-}
-
-static void server_req_subcall_cb(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
+static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 {
 	int rc;
-	struct writebuf wb = { .count = 0 };
-	struct server_subcall *sc, *osc;
 	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
-	struct afb_stub_ws *stubws = wreq->stubws;
-
-	sc = malloc(sizeof *sc);
-	if (!sc) {
-		callback(cb_closure, 1, afb_msg_json_internal_error());
-	} else {
-		sc->callback = callback;
-		sc->closure = cb_closure;
-
-		pthread_mutex_unlock(&stubws->mutex);
-		sc->subcallid = ptr2id(sc);
-		do {
-			sc->subcallid++;
-			osc = stubws->subcalls;
-			while(osc && osc->subcallid != sc->subcallid)
-				osc = osc->next;
-		} while (osc);
-		sc->next = stubws->subcalls;
-		stubws->subcalls = sc;
-		pthread_mutex_unlock(&stubws->mutex);
-
-		if (writebuf_char(&wb, CHAR_FOR_SUBCALL_CALL)
-		 && writebuf_uint32(&wb, wreq->msgid)
-		 && writebuf_uint32(&wb, sc->subcallid)
-		 && writebuf_string(&wb, api)
-		 && writebuf_string(&wb, verb)
-		 && writebuf_object(&wb, args)) {
-			rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
-			if (rc >= 0)
-				return;
-		}
-		ERROR("error while sending fail");
-	}
-}
 
-static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event)
-{
-	int rc, rc2;
-	struct writebuf wb = { .count = 0 };
-	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
-
-	rc = afb_evt_add_watch(wreq->stubws->listener, event);
+	rc = afb_evt_listener_watch_x2(wreq->stubws->listener, event);
+	if (rc >= 0)
+		rc = afb_proto_ws_call_subscribe(wreq->call,  afb_evt_event_x2_id(event));
 	if (rc < 0)
-		return rc;
-
-	if (writebuf_char(&wb, CHAR_FOR_EVT_SUBSCRIBE)
-	 && writebuf_uint32(&wb, wreq->msgid)
-	 && writebuf_uint32(&wb, (uint32_t)afb_evt_event_id(event))
-	 && writebuf_string(&wb, afb_evt_event_name(event))) {
-		rc2 = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
-		if (rc2 >= 0)
-			goto success;
-	}
-	ERROR("error while subscribing event");
-success:
+		ERROR("error while subscribing event");
 	return rc;
 }
 
-static int server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event)
+static int server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 {
-	int rc, rc2;
-	struct writebuf wb = { .count = 0 };
+	int rc;
 	struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 
-	if (writebuf_char(&wb, CHAR_FOR_EVT_UNSUBSCRIBE)
-	 && writebuf_uint32(&wb, wreq->msgid)
-	 && writebuf_uint32(&wb, (uint32_t)afb_evt_event_id(event))
-	 && writebuf_string(&wb, afb_evt_event_name(event))) {
-		rc2 = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
-		if (rc2 >= 0)
-			goto success;
-	}
-	ERROR("error while subscribing event");
-success:
-	rc = afb_evt_remove_watch(wreq->stubws->listener, event);
+	rc = afb_proto_ws_call_unsubscribe(wreq->call,  afb_evt_event_x2_id(event));
+	if (rc < 0)
+		ERROR("error while unsubscribing event");
 	return rc;
 }
 
 static const struct afb_xreq_query_itf server_req_xreq_itf = {
-	.success = server_req_success_cb,
-	.fail = server_req_fail_cb,
+	.reply = server_req_reply_cb,
 	.unref = server_req_destroy_cb,
-	.subcall = server_req_subcall_cb,
 	.subscribe = server_req_subscribe_cb,
 	.unsubscribe = server_req_unsubscribe_cb
 };
 
 /******************* client part **********************************/
 
-/* search a memorized call */
-static struct client_call *client_call_search(struct afb_stub_ws *stubws, uint32_t msgid)
+static struct afb_proto_ws *client_get_proto(struct afb_stub_ws *stubws)
 {
-	struct client_call *call;
+	struct fdev *fdev;
+	struct afb_proto_ws *proto;
 
-	call = stubws->calls;
-	while (call != NULL && call->msgid != msgid)
-		call = call->next;
-
-	return call;
+	proto = stubws->proto;
+	if (proto == NULL && stubws->robust.reopen) {
+		fdev = stubws->robust.reopen(stubws->robust.closure);
+		if (fdev != NULL)
+			proto = afb_stub_ws_create_proto(stubws, fdev, 0);
+	}
+	return proto;
 }
 
-/* search the event */
-static struct client_event *client_event_search(struct afb_stub_ws *stubws, uint32_t eventid, const char *name)
+static int client_make_ids(struct afb_stub_ws *stubws, struct afb_proto_ws *proto, struct afb_context *context, uint16_t *sessionid, uint16_t *tokenid)
 {
-	struct client_event *ev;
-
-	ev = stubws->events;
-	while (ev != NULL && (ev->eventid != eventid || 0 != strcmp(afb_evt_event_name(ev->event), name)))
-		ev = ev->next;
+	int rc, rc2;
+	uint16_t sid, tid;
 
-	return ev;
-}
+	rc = 0;
 
+	/* get the session */
+	if (!context->session)
+		sid = 0;
+	else {
+		sid = afb_session_id(context->session);
+		rc2 = u16id2bool_set(&stubws->session_flags, sid, 1);
+		if (rc2 < 0)
+			rc = rc2;
+		else if (rc2 == 0)
+			rc = afb_proto_ws_client_session_create(proto, sid, afb_session_uuid(context->session));
+	}
 
-/* allocates and init the memorizing call */
-static struct client_call *client_call_make(struct afb_stub_ws *stubws, struct afb_xreq *xreq)
-{
-	struct client_call *call;
-
-	call = malloc(sizeof *call);
-	if (call != NULL) {
-		afb_xreq_addref(xreq);
-		call->xreq = xreq;
-		call->msgid = ptr2id(call);
-		while(client_call_search(stubws, call->msgid) != NULL)
-			call->msgid++;
-		call->stubws = stubws;
-		call->next = stubws->calls;
-		stubws->calls = call;
+	/* get the token */
+	if (!context->token)
+		tid = 0;
+	else {
+		tid = afb_token_id(context->token);
+		rc2 = u16id2bool_set(&stubws->token_flags, tid, 1);
+		if (rc2 < 0)
+			rc = rc2;
+		else if (rc2 == 0) {
+			rc2 = afb_proto_ws_client_token_create(proto, tid, afb_token_string(context->token));
+			if (rc2 < 0)
+				rc = rc2;
+		}
 	}
-	return call;
+
+	*sessionid = sid;
+	*tokenid = tid;
+	return rc;
 }
 
-/* free and release the memorizing call */
-static void client_call_destroy(struct client_call *call)
+/* on call, propagate it to the ws service */
+static void client_api_call_cb(void * closure, struct afb_xreq *xreq)
 {
-	struct client_call **prv;
+	int rc;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_proto_ws *proto;
+	uint16_t sessionid;
+	uint16_t tokenid;
 
-	prv = &call->stubws->calls;
-	while (*prv != NULL) {
-		if (*prv == call) {
-			*prv = call->next;
-			break;
-		}
-		prv = &(*prv)->next;
+	proto = client_get_proto(stubws);
+	if (proto == NULL) {
+		afb_xreq_reply(xreq, NULL, afb_error_text_disconnected, NULL);
+		return;
 	}
 
-	afb_xreq_unref(call->xreq);
-	free(call);
+	rc = client_make_ids(stubws, proto, &xreq->context, &sessionid, &tokenid);
+	if (rc >= 0) {
+		afb_xreq_unhooked_addref(xreq);
+		rc = afb_proto_ws_client_call(
+				proto,
+				xreq->request.called_verb,
+				afb_xreq_json(xreq),
+				sessionid,
+				tokenid,
+				xreq,
+				xreq_on_behalf_cred_export(xreq));
+	}
+	if (rc < 0) {
+		afb_xreq_reply(xreq, NULL, afb_error_text_internal_error, "can't send message");
+		afb_xreq_unhooked_unref(xreq);
+	}
 }
 
-/* get event data from the message */
-static int client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name)
+/* get the description */
+static void client_api_describe_cb(void * closure, void (*describecb)(void *, struct json_object *), void *clocb)
 {
-	return readbuf_uint32(rb, eventid) && readbuf_string(rb, name, NULL);
+	struct afb_stub_ws *stubws = closure;
+	struct afb_proto_ws *proto;
+
+	proto = client_get_proto(stubws);
+	if (proto)
+		afb_proto_ws_client_describe(proto, describecb, clocb);
+	else
+		describecb(clocb, NULL);
 }
 
-/* get event from the message */
-static int client_msg_event_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_event **ev)
-{
-	const char *name;
-	uint32_t eventid;
+/******************* server part: manage events **********************************/
 
-	/* get event data from the message */
-	if (!client_msg_event_read(rb, &eventid, &name)) {
-		ERROR("Invalid message");
-		return 0;
-	}
+static void server_event_add_cb(void *closure, const char *event, uint16_t eventid)
+{
+	int rc;
+	struct afb_stub_ws *stubws = closure;
 
-	/* check conflicts */
-	*ev = client_event_search(stubws, eventid, name);
-	if (*ev == NULL) {
-		ERROR("event %s not found", name);
-		return 0;
+	if (stubws->proto != NULL) {
+		rc = u16id2bool_set(&stubws->event_flags, eventid, 1);
+		if (rc == 0) {
+			rc = afb_proto_ws_server_event_create(stubws->proto, eventid, event);
+			if (rc < 0)
+				u16id2bool_set(&stubws->event_flags, eventid, 0);
+		}
 	}
-
-	return 1;
 }
 
-/* get event from the message */
-static int client_msg_call_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_call **call)
+static void server_event_remove_cb(void *closure, const char *event, uint16_t eventid)
 {
-	uint32_t msgid;
-
-	/* get event data from the message */
-	if (!readbuf_uint32(rb, &msgid)) {
-		ERROR("Invalid message");
-		return 0;
-	}
+	struct afb_stub_ws *stubws = closure;
 
-	/* get the call */
-	*call = client_call_search(stubws, msgid);
-	if (*call == NULL) {
-		ERROR("message not found");
-		return 0;
+	if (stubws->proto != NULL) {
+		if (u16id2bool_set(&stubws->event_flags, eventid, 0))
+			afb_proto_ws_server_event_remove(stubws->proto, eventid);
 	}
-
-	return 1;
 }
 
-/* read a subscrition message */
-static int client_msg_subscription_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_call **call, struct client_event **ev)
+static void server_event_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object)
 {
-	return client_msg_call_get(stubws, rb, call) && client_msg_event_get(stubws, rb, ev);
+	struct afb_stub_ws *stubws = closure;
+
+	if (stubws->proto != NULL && u16id2bool_get(stubws->event_flags, eventid))
+		afb_proto_ws_server_event_push(stubws->proto, eventid, object);
+	json_object_put(object);
 }
 
-/* adds an event */
-static void client_event_create(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 {
-	size_t offset;
-	const char *name;
-	uint32_t eventid;
-	struct client_event *ev;
-
-	/* get event data from the message */
-	offset = client_msg_event_read(rb, &eventid, &name);
-	if (offset == 0) {
-		ERROR("Invalid message");
-		return;
-	}
-
-	/* check conflicts */
-	ev = client_event_search(stubws, eventid, name);
-	if (ev != NULL) {
-		ev->refcount++;
-		return;
-	}
+	struct afb_stub_ws *stubws = closure;
 
-	/* no conflict, try to add it */
-	ev = malloc(sizeof *ev);
-	if (ev != NULL) {
-		ev->event = afb_evt_create_event(name);
-		if (ev->event.closure == NULL)
-			free(ev);
-		else {
-			ev->refcount = 1;
-			ev->eventid = eventid;
-			ev->next = stubws->events;
-			stubws->events = ev;
-			return;
-		}
-	}
-	ERROR("can't create event %s, out of memory", name);
+	if (stubws->proto != NULL)
+		afb_proto_ws_server_event_broadcast(stubws->proto, event, object, uuid, hop);
+	json_object_put(object);
 }
 
-/* removes an event */
-static void client_event_drop(struct afb_stub_ws *stubws, struct readbuf *rb)
-{
-	struct client_event *ev, **prv;
-
-	/* retrieves the event */
-	if (!client_msg_event_get(stubws, rb, &ev))
-		return;
+/*****************************************************/
 
-	/* decrease the reference count */
-	if (--ev->refcount)
-		return;
+static void client_on_reply_cb(void *closure, void *request, struct json_object *object, const char *error, const char *info)
+{
+	struct afb_xreq *xreq = request;
 
-	/* unlinks the event */
-	prv = &stubws->events;
-	while (*prv != ev)
-		prv = &(*prv)->next;
-	*prv = ev->next;
+	afb_xreq_reply(xreq, object, error, info);
+	afb_xreq_unhooked_unref(xreq);
+}
 
-	/* destroys the event */
-	afb_event_drop(ev->event);
-	free(ev);
+static void client_on_event_create_cb(void *closure, uint16_t event_id, const char *event_name)
+{
+	struct afb_stub_ws *stubws = closure;
+	struct afb_event_x2 *event;
+	int rc;
+	
+	/* check conflicts */
+	event = afb_evt_event_x2_create(event_name);
+	if (event == NULL)
+		ERROR("can't create event %s, out of memory", event_name);
+	else {
+		rc = u16id2ptr_add(&stubws->event_proxies, event_id, event);
+		if (rc < 0) {
+			ERROR("can't record event %s", event_name);
+			afb_evt_event_x2_unref(event);
+		}
+	}
 }
 
-/* subscribes an event */
-static void client_event_subscribe(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void client_on_event_remove_cb(void *closure, uint16_t event_id)
 {
-	struct client_event *ev;
-	struct client_call *call;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_event_x2 *event;
+	int rc;
 
-	if (client_msg_subscription_get(stubws, rb, &call, &ev)) {
-		/* subscribe the request from the event */
-		if (afb_xreq_subscribe(call->xreq, ev->event) < 0)
-			ERROR("can't subscribe: %m");
-	}
+	rc = u16id2ptr_drop(&stubws->event_proxies, event_id, (void**)&event);
+	if (rc == 0 && event)
+		afb_evt_event_x2_unref(event);
 }
 
-/* unsubscribes an event */
-static void client_event_unsubscribe(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void client_on_event_subscribe_cb(void *closure, void *request, uint16_t event_id)
 {
-	struct client_event *ev;
-	struct client_call *call;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_xreq *xreq = request;
+	struct afb_event_x2 *event;
+	int rc;
 
-	if (client_msg_subscription_get(stubws, rb, &call, &ev)) {
-		/* unsubscribe the request from the event */
-		if (afb_xreq_unsubscribe(call->xreq, ev->event) < 0)
-			ERROR("can't unsubscribe: %m");
-	}
+	rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
+	if (rc < 0 || !event || afb_xreq_subscribe(xreq, event) < 0)
+		ERROR("can't subscribe: %m");
 }
 
-/* receives broadcasted events */
-static void client_event_broadcast(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void client_on_event_unsubscribe_cb(void *closure, void *request, uint16_t event_id)
 {
-	struct json_object *object;
-	const char *event;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_xreq *xreq = request;
+	struct afb_event_x2 *event;
+	int rc;
 
-	if (readbuf_string(rb, &event, NULL) && readbuf_object(rb, &object))
-		afb_evt_broadcast(event, object);
-	else
-		ERROR("unreadable broadcasted event");
+	rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
+	if (rc < 0 || !event || afb_xreq_unsubscribe(xreq, event) < 0)
+		ERROR("can't unsubscribe: %m");
 }
 
-/* pushs an event */
-static void client_event_push(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void client_on_event_push_cb(void *closure, uint16_t event_id, struct json_object *data)
 {
-	struct client_event *ev;
-	struct json_object *object;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_event_x2 *event;
+	int rc;
 
-	if (client_msg_event_get(stubws, rb, &ev) && readbuf_object(rb, &object))
-		afb_event_push(ev->event, object);
+	rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
+	if (rc >= 0 && event)
+		rc = afb_evt_event_x2_push(event, data);
 	else
 		ERROR("unreadable push event");
+	if (rc <= 0)
+		afb_proto_ws_client_event_unexpected(stubws->proto, event_id);
 }
 
-static void client_reply_success(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void client_on_event_broadcast_cb(void *closure, const char *event_name, struct json_object *data, const uuid_binary_t uuid, uint8_t hop)
 {
-	struct client_call *call;
-	struct json_object *object;
-	const char *info;
-	uint32_t flags;
-
-	/* retrieve the message data */
-	if (!client_msg_call_get(stubws, rb, &call))
-		return;
-
-	if (readbuf_uint32(rb, &flags)
-	 && readbuf_string(rb, &info, NULL)
-	 && readbuf_object(rb, &object)) {
-		call->xreq->context.flags = (unsigned)flags;
-		afb_xreq_success(call->xreq, object, *info ? info : NULL);
-	} else {
-		/* failing to have the answer */
-		afb_xreq_fail(call->xreq, "error", "ws error");
-	}
-	client_call_destroy(call);
+	afb_evt_rebroadcast(event_name, data, uuid, hop);
 }
 
-static void client_reply_fail(struct afb_stub_ws *stubws, struct readbuf *rb)
-{
-	struct client_call *call;
-	const char *info, *status;
-	uint32_t flags;
+/*****************************************************/
 
-	/* retrieve the message data */
-	if (!client_msg_call_get(stubws, rb, &call))
-		return;
+static struct afb_session *server_add_session(struct afb_stub_ws *stubws, uint16_t sessionid, const char *sessionstr)
+{
+	struct afb_session *session;
+	int rc, created;
 
-	if (readbuf_uint32(rb, &flags)
-	 && readbuf_string(rb, &status, NULL)
-	 && readbuf_string(rb, &info, NULL)) {
-		call->xreq->context.flags = (unsigned)flags;
-		afb_xreq_fail(call->xreq, status, *info ? info : NULL);
-	} else {
-		/* failing to have the answer */
-		afb_xreq_fail(call->xreq, "error", "ws error");
+	session = afb_session_get(sessionstr, AFB_SESSION_TIMEOUT_DEFAULT, &created);
+	if (session == NULL)
+		ERROR("can't create session %s, out of memory", sessionstr);
+	else {
+		afb_session_set_autoclose(session, 1);
+		rc = u16id2ptr_add(&stubws->session_proxies, sessionid, session);
+		if (rc < 0) {
+			ERROR("can't record session %s", sessionstr);
+			afb_session_unref(session);
+			session = NULL;
+		}
 	}
-	client_call_destroy(call);
+	return session;
 }
 
-/* send a subcall reply */
-static void client_send_subcall_reply(struct client_subcall *subcall, int iserror, json_object *object)
+static void server_on_session_create_cb(void *closure, uint16_t sessionid, const char *sessionstr)
 {
-	int rc;
-	struct writebuf wb = { .count = 0 };
-	char ie = (char)!!iserror;
-
-	if (!writebuf_char(&wb, CHAR_FOR_SUBCALL_REPLY)
-	 || !writebuf_uint32(&wb, subcall->subcallid)
-	 || !writebuf_char(&wb, ie)
-	 || !writebuf_object(&wb, object)) {
-		/* write error ? */
-		return;
-	}
+	struct afb_stub_ws *stubws = closure;
 
-	rc = afb_ws_binary_v(subcall->stubws->ws, wb.iovec, wb.count);
-	if (rc >= 0)
-		return;
-	ERROR("error while sending subcall reply");
+	server_add_session(stubws, sessionid, sessionstr);
 }
 
-/* callback for subcall reply */
-static void client_subcall_reply_cb(void *closure, int iserror, json_object *object)
+static void server_on_session_remove_cb(void *closure, uint16_t sessionid)
 {
-	client_send_subcall_reply(closure, iserror, object);
-	free(closure);
+	struct afb_stub_ws *stubws = closure;
+	struct afb_session *session;
+	int rc;
+	
+	rc = u16id2ptr_drop(&stubws->event_proxies, sessionid, (void**)&session);
+	if (rc == 0 && session)
+		afb_session_unref(session);
 }
 
-/* received a subcall request */
-static void client_subcall(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void server_on_token_create_cb(void *closure, uint16_t tokenid, const char *tokenstr)
 {
-	struct client_subcall *subcall;
-	struct client_call *call;
-	const char *api, *verb;
-	uint32_t subcallid;
-	struct json_object *object;
-
-	subcall = malloc(sizeof *subcall);
-	if (!subcall)
-		return;
-
-	/* retrieve the message data */
-	if (!client_msg_call_get(stubws, rb, &call))
-		return;
+	struct afb_stub_ws *stubws = closure;
+	struct afb_token *token;
+	int rc;
 
-	if (readbuf_uint32(rb, &subcallid)
-	 && readbuf_string(rb, &api, NULL)
-	 && readbuf_string(rb, &verb, NULL)
-	 && readbuf_object(rb, &object)) {
-		subcall->stubws = stubws;
-		subcall->subcallid = subcallid;
-		afb_xreq_subcall(call->xreq, api, verb, object, client_subcall_reply_cb, subcall);
+	rc = afb_token_get(&token, tokenstr);
+	if (rc < 0)
+		ERROR("can't create token %s, out of memory", tokenstr);
+	else {
+		rc = u16id2ptr_add(&stubws->token_proxies, tokenid, token);
+		if (rc < 0) {
+			ERROR("can't record token %s", tokenstr);
+			afb_token_unref(token);
+		}
 	}
 }
 
-/* callback when receiving binary data */
-static void client_on_binary(void *closure, char *data, size_t size)
+static void server_on_token_remove_cb(void *closure, uint16_t tokenid)
 {
-	if (size > 0) {
-		struct afb_stub_ws *stubws = closure;
-		struct readbuf rb = { .head = data, .end = data + size };
-
-		pthread_mutex_lock(&stubws->mutex);
-		switch (*rb.head++) {
-		case CHAR_FOR_ANSWER_SUCCESS: /* success */
-			client_reply_success(stubws, &rb);
-			break;
-		case CHAR_FOR_ANSWER_FAIL: /* fail */
-			client_reply_fail(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_BROADCAST: /* broadcast */
-			client_event_broadcast(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_ADD: /* creates the event */
-			client_event_create(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_DEL: /* drops the event */
-			client_event_drop(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_PUSH: /* pushs the event */
-			client_event_push(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_SUBSCRIBE: /* subscribe event for a request */
-			client_event_subscribe(stubws, &rb);
-			break;
-		case CHAR_FOR_EVT_UNSUBSCRIBE: /* unsubscribe event for a request */
-			client_event_unsubscribe(stubws, &rb);
-			break;
-		case CHAR_FOR_SUBCALL_CALL: /* subcall */
-			client_subcall(stubws, &rb);
-			break;
-		default: /* unexpected message */
-			/* TODO: close the connection */
-			break;
-		}
-		pthread_mutex_unlock(&stubws->mutex);
-	}
-	free(data);
+	struct afb_stub_ws *stubws = closure;
+	struct afb_token *token;
+	int rc;
+	
+	rc = u16id2ptr_drop(&stubws->event_proxies, tokenid, (void**)&token);
+	if (rc == 0 && token)
+		afb_token_unref(token);
 }
 
-/* on call, propagate it to the ws service */
-static void client_call_cb(void * closure, struct afb_xreq *xreq)
+static void server_on_event_unexpected_cb(void *closure, uint16_t eventid)
 {
-	int rc;
-	struct client_call *call;
-	struct writebuf wb = { .count = 0 };
-	const char *raw;
-	size_t szraw;
 	struct afb_stub_ws *stubws = closure;
 
-	pthread_mutex_lock(&stubws->mutex);
-
-	/* create the recording data */
-	call = client_call_make(stubws, xreq);
-	if (call == NULL) {
-		afb_xreq_fail_f(xreq, "error", "out of memory");
-		goto end;
-	}
-
-	/* creates the call message */
-	raw = afb_xreq_raw(xreq, &szraw);
-	if (raw == NULL)
-		goto internal_error;
-	if (!writebuf_char(&wb, CHAR_FOR_CALL)
-	 || !writebuf_uint32(&wb, call->msgid)
-	 || !writebuf_uint32(&wb, (uint32_t)xreq->context.flags)
-	 || !writebuf_string(&wb, xreq->verb)
-	 || !writebuf_string(&wb, afb_session_uuid(xreq->context.session))
-	 || !writebuf_string_length(&wb, raw, szraw))
-		goto overflow;
-
-	/* send */
-	rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count);
-	if (rc >= 0)
-		goto end;
-
-	afb_xreq_fail(xreq, "error", "websocket sending error");
-	goto clean_call;
-
-internal_error:
-	afb_xreq_fail(xreq, "error", "internal: raw is NULL!");
-	goto clean_call;
-
-overflow:
-	afb_xreq_fail(xreq, "error", "overflow: size doesn't match 32 bits!");
-
-clean_call:
-	client_call_destroy(call);
-end:
-	pthread_mutex_unlock(&stubws->mutex);
+	afb_evt_listener_unwatch_id(stubws->listener, eventid);
 }
 
-/******************* client description part for server *****************************/
-
-/* on call, propagate it to the ws service */
-static void server_on_call(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void server_on_call_cb(void *closure, struct afb_proto_ws_call *call, const char *verb, struct json_object *args, uint16_t sessionid, uint16_t tokenid, const char *user_creds)
 {
+	struct afb_stub_ws *stubws = closure;
 	struct server_req *wreq;
-	char *cverb;
-	const char *uuid, *verb;
-	uint32_t flags, msgid;
-	size_t lenverb;
-	struct json_object *object;
+	struct afb_session *session;
+	struct afb_token *token;
+	int rc;
 
 	afb_stub_ws_addref(stubws);
 
-	/* reads the call message data */
-	if (!readbuf_uint32(rb, &msgid)
-	 || !readbuf_uint32(rb, &flags)
-	 || !readbuf_string(rb, &verb, &lenverb)
-	 || !readbuf_string(rb, &uuid, NULL)
-	 || !readbuf_object(rb, &object))
-		goto overflow;
+	/* get tokens and sessions */
+	rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
+	if (rc < 0) {
+		if (sessionid != 0)
+			goto no_session;
+		session = server_add_session(stubws, sessionid, NULL);
+		if (!session)
+			goto out_of_memory;
+	}
+	if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
+		token = NULL;
 
 	/* create the request */
-	wreq = malloc(++lenverb + sizeof *wreq);
+	wreq = malloc(sizeof *wreq);
 	if (wreq == NULL)
 		goto out_of_memory;
 
 	afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 	wreq->stubws = stubws;
-	wreq->msgid = msgid;
-	cverb = (char*)&wreq[1];
-	memcpy(cverb, verb, lenverb);
+	wreq->call = call;
 
 	/* init the context */
-	if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0)
-		goto unconnected;
-	wreq->xreq.context.flags = flags;
+	afb_context_init(&wreq->xreq.context, session, token, stubws->cred);
+	afb_context_on_behalf_import(&wreq->xreq.context, user_creds);
 
 	/* makes the call */
-	wreq->xreq.cred = afb_cred_addref(stubws->cred);
-	wreq->xreq.api = stubws->apiname;
-	wreq->xreq.verb = cverb;
-	wreq->xreq.json = object;
+	wreq->xreq.request.called_api = stubws->apiname;
+	wreq->xreq.request.called_verb = verb;
+	wreq->xreq.json = args;
 	afb_xreq_process(&wreq->xreq, stubws->apiset);
 	return;
 
-unconnected:
-	free(wreq);
 out_of_memory:
-	json_object_put(object);
-overflow:
+no_session:
+	json_object_put(args);
 	afb_stub_ws_unref(stubws);
+	afb_proto_ws_call_reply(call, NULL, afb_error_text_internal_error, NULL);
+	afb_proto_ws_call_unref(call);
 }
 
-/* on subcall reply */
-static void server_on_subcall_reply(struct afb_stub_ws *stubws, struct readbuf *rb)
+static void server_on_description_cb(void *closure, struct json_object *description)
 {
-	char iserror;
-	uint32_t subcallid;
-	struct json_object *object;
-	struct server_subcall *sc, **psc;
-
-	/* reads the call message data */
-	if (!readbuf_uint32(rb, &subcallid)
-	 || !readbuf_char(rb, &iserror)
-	 || !readbuf_object(rb, &object)) {
-		/* TODO bad protocol */
-		return;
-	}
-
-	/* search the subcall and unlink it */
-	pthread_mutex_lock(&stubws->mutex);
-	psc = &stubws->subcalls;
-	while ((sc = *psc) && sc->subcallid != subcallid)
-		psc = &sc->next;
-	if (!sc) {
-		pthread_mutex_unlock(&stubws->mutex);
-		/* TODO subcall not found */
-	} else {
-		*psc = sc->next;
-		pthread_mutex_unlock(&stubws->mutex);
-		sc->callback(sc->closure, (int)iserror, object);
-		free(sc);
-	}
-	json_object_put(object);
+	struct afb_proto_ws_describe *describe = closure;
+	afb_proto_ws_describe_put(describe, description);
+	json_object_put(description);
 }
 
-/* callback when receiving binary data */
-static void server_on_binary(void *closure, char *data, size_t size)
+
+static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 {
-	if (size > 0) {
-		struct readbuf rb = { .head = data, .end = data + size };
-		switch (*rb.head++) {
-		case CHAR_FOR_CALL:
-			server_on_call(closure, &rb);
-			break;
-		case CHAR_FOR_SUBCALL_REPLY:
-			server_on_subcall_reply(closure, &rb);
-			break;
-		default: /* unexpected message */
-			/* TODO: close the connection */
-			break;
-		}
-	}
-	free(data);
+	struct afb_stub_ws *stubws = closure;
+
+	afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 }
 
-/******************* server part: manage events **********************************/
+/*****************************************************/
 
-static void server_event_send(struct afb_stub_ws *stubws, char order, const char *event, int eventid, const char *data)
+static const struct afb_proto_ws_client_itf client_itf =
 {
-	int rc;
-	struct writebuf wb = { .count = 0 };
-
-	if (writebuf_char(&wb, order)
-	 && writebuf_uint32(&wb, eventid)
-	 && writebuf_string(&wb, event)
-	 && (data == NULL || writebuf_string(&wb, data))) {
-		rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count);
-		if (rc >= 0)
-			return;
-	}
-	ERROR("error while sending %c for event %s", order, event);
-}
+	.on_reply = client_on_reply_cb,
+	.on_event_create = client_on_event_create_cb,
+	.on_event_remove = client_on_event_remove_cb,
+	.on_event_subscribe = client_on_event_subscribe_cb,
+	.on_event_unsubscribe = client_on_event_unsubscribe_cb,
+	.on_event_push = client_on_event_push_cb,
+	.on_event_broadcast = client_on_event_broadcast_cb,
+};
+
+static struct afb_api_itf client_api_itf = {
+	.call = client_api_call_cb,
+	.describe = client_api_describe_cb
+};
 
-static void server_event_add(void *closure, const char *event, int eventid)
+static const struct afb_proto_ws_server_itf server_itf =
 {
-	server_event_send(closure, CHAR_FOR_EVT_ADD, event, eventid, NULL);
-}
+	.on_session_create = server_on_session_create_cb,
+	.on_session_remove = server_on_session_remove_cb,
+	.on_token_create = server_on_token_create_cb,
+	.on_token_remove = server_on_token_remove_cb,
+	.on_call = server_on_call_cb,
+	.on_describe = server_on_describe_cb,
+	.on_event_unexpected = server_on_event_unexpected_cb
+};
+
+/* the interface for events pushing */
+static const struct afb_evt_itf server_event_itf = {
+	.broadcast = server_event_broadcast_cb,
+	.push = server_event_push_cb,
+	.add = server_event_add_cb,
+	.remove = server_event_remove_cb
+};
 
-static void server_event_remove(void *closure, const char *event, int eventid)
+/*****************************************************/
+/*****************************************************/
+
+static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 {
-	server_event_send(closure, CHAR_FOR_EVT_DEL, event, eventid, NULL);
+	struct afb_session *session = ptr;
+	afb_session_unref(session);
 }
 
-static void server_event_push(void *closure, const char *event, int eventid, struct json_object *object)
+static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 {
-	const char *data = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
-	server_event_send(closure, CHAR_FOR_EVT_PUSH, event, eventid, data ? : "null");
-	json_object_put(object);
+	struct afb_token *token = ptr;
+	afb_token_unref(token);
 }
 
-static void server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object)
+static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 {
-	int rc;
-	struct afb_stub_ws *stubws = closure;
+	struct afb_event_x2 *eventid = ptr;
+	afb_evt_event_x2_unref(eventid);
+}
 
-	struct writebuf wb = { .count = 0 };
+/* disconnect */
+static void disconnect(struct afb_stub_ws *stubws)
+{
+	struct u16id2ptr *i2p;
+	struct u16id2bool *i2b;
 
-	if (writebuf_char(&wb, CHAR_FOR_EVT_BROADCAST) && writebuf_string(&wb, event) && writebuf_object(&wb, object)) {
-		rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count);
-		if (rc < 0)
-			ERROR("error while broadcasting event %s", event);
-	} else
-		ERROR("error while broadcasting event %s", event);
-	json_object_put(object);
+	afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
+	if (stubws->is_client) {
+		i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
+		if (i2p) {
+			u16id2ptr_forall(i2p, release_all_events_cb, NULL);
+			u16id2ptr_destroy(&i2p);
+		}
+		i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
+		u16id2bool_destroy(&i2b);
+		i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
+		u16id2bool_destroy(&i2b);
+	} else {
+		afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
+		afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
+		i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
+		u16id2bool_destroy(&i2b);
+		i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
+		if (i2p) {
+			u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
+			u16id2ptr_destroy(&i2p);
+		}
+		i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
+		if (i2p) {
+			u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
+			u16id2ptr_destroy(&i2p);
+		}
+	}
 }
 
-/*****************************************************/
-
 /* callback when receiving a hangup */
-static void server_on_hangup(void *closure)
+static void on_hangup(void *closure)
 {
 	struct afb_stub_ws *stubws = closure;
 
-	/* close the socket */
-	if (stubws->fd >= 0) {
-		close(stubws->fd);
-		stubws->fd = -1;
+	if (stubws->proto) {
+		afb_stub_ws_addref(stubws);
+		disconnect(stubws);
+		if (stubws->on_hangup)
+			stubws->on_hangup(stubws);
+		afb_stub_ws_unref(stubws);
 	}
+}
 
-	/* release the client */
-	afb_stub_ws_unref(stubws);
+static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
+{
+	return jobs_queue(proto, 0, callback, arg);
 }
 
 /*****************************************************/
 
-/* the interface for events pushing */
-static const struct afb_evt_itf server_evt_itf = {
-	.broadcast = server_event_broadcast,
-	.push = server_event_push,
-	.add = server_event_add,
-	.remove = server_event_remove
-};
-
-static const struct afb_ws_itf stub_ws_client_ws_itf =
+static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 {
-	.on_close = NULL,
-	.on_text = NULL,
-	.on_binary = client_on_binary,
-	.on_error = NULL,
-	.on_hangup = NULL
-};
+	struct afb_proto_ws *proto;
 
-static const struct afb_ws_itf server_ws_itf =
-{
-	.on_close = NULL,
-	.on_text = NULL,
-	.on_binary = server_on_binary,
-	.on_error = NULL,
-	.on_hangup = server_on_hangup
-};
-
-static struct afb_api_itf ws_api_itf = {
-	.call = client_call_cb
-};
+	stubws->proto = proto = is_client
+		  ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
+		  : afb_proto_ws_create_server(fdev, &server_itf, stubws);
+	if (proto) {
+		afb_proto_ws_on_hangup(proto, on_hangup);
+		afb_proto_ws_set_queuing(proto, enqueue_processing);
+	}
 
-/*****************************************************/
+	return proto;
+}
 
-static struct afb_stub_ws *afb_stub_ws_create(int fd, const char *apiname, struct afb_apiset *apiset, const struct afb_ws_itf *itf)
+static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 {
 	struct afb_stub_ws *stubws;
 
-	stubws = calloc(1, sizeof *stubws + strlen(apiname));
+	stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 	if (stubws == NULL)
 		errno = ENOMEM;
 	else {
-		fcntl(fd, F_SETFD, FD_CLOEXEC);
-		fcntl(fd, F_SETFL, O_NONBLOCK);
-		stubws->ws = afb_ws_create(afb_common_get_event_loop(), fd, itf, stubws);
-		if (stubws->ws != NULL) {
-			stubws->fd = fd;
+		if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
+			stubws->refcount = 1;
+			stubws->is_client = is_client;
 			strcpy(stubws->apiname, apiname);
 			stubws->apiset = afb_apiset_addref(apiset);
-			stubws->refcount = 1;
-			stubws->subcalls = NULL;
 			return stubws;
 		}
 		free(stubws);
 	}
+	fdev_unref(fdev);
 	return NULL;
 }
 
-struct afb_stub_ws *afb_stub_ws_create_client(int fd, const char *apiname, struct afb_apiset *apiset)
+struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 {
-	struct afb_api afb_api;
-	struct afb_stub_ws *stubws;
-
-	stubws = afb_stub_ws_create(fd, apiname, apiset, &stub_ws_client_ws_itf);
-	if (stubws) {
-		afb_api.closure = stubws;
-		afb_api.itf = &ws_api_itf;
-		if (afb_apiset_add(apiset, stubws->apiname, afb_api) >= 0)
-			return stubws;
-		afb_stub_ws_unref(stubws);
-	}
-	return NULL;
-
+	return afb_stub_ws_create(fdev, apiname, apiset, 1);
 }
 
-struct afb_stub_ws *afb_stub_ws_create_server(int fd, const char *apiname, struct afb_apiset *apiset)
+struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 {
 	struct afb_stub_ws *stubws;
 
-	stubws = afb_stub_ws_create(fd, apiname, apiset, &server_ws_itf);
+	stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 	if (stubws) {
-		stubws->cred = afb_cred_create_for_socket(fd);
-		stubws->listener = afb_evt_listener_create(&server_evt_itf, stubws);
+		stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
+		stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 		if (stubws->listener != NULL)
 			return stubws;
 		afb_stub_ws_unref(stubws);
@@ -1133,19 +736,15 @@ struct afb_stub_ws *afb_stub_ws_create_server(int fd, const char *apiname, struc
 
 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 {
-	struct server_subcall *sc, *nsc;
-
-	if (!__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
-		afb_evt_listener_unref(stubws->listener);
-		afb_ws_destroy(stubws->ws);
-		nsc = stubws->subcalls;
-		while (nsc) {
-			sc= nsc;
-			nsc = sc->next;
-			sc->callback(sc->closure, 1, NULL);
-			free(sc);
+	if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
+
+		if (stubws->is_client) {
+			stubws->robust.reopen = NULL;
+			if (stubws->robust.release)
+				stubws->robust.release(stubws->robust.closure);
 		}
-		afb_cred_unref(stubws->cred);
+
+		disconnect(stubws);
 		afb_apiset_unref(stubws->apiset);
 		free(stubws);
 	}
@@ -1156,3 +755,40 @@ void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 	__atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 }
 
+void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
+{
+	stubws->on_hangup = on_hangup;
+}
+
+const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
+{
+	return stubws->apiname;
+}
+
+struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
+{
+	struct afb_api_item api;
+
+	assert(stubws->is_client); /* check client */
+	api.closure = stubws;
+	api.itf = &client_api_itf;
+	api.group = stubws; /* serialize for reconnections */
+	return api;
+}
+
+int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
+{
+	return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
+}
+
+void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
+{
+	assert(stubws->is_client); /* check client */
+
+	if (stubws->robust.release)
+		stubws->robust.release(stubws->robust.closure);
+
+	stubws->robust.reopen = reopen;
+	stubws->robust.closure = closure;
+	stubws->robust.release = release;
+}