sock_async_event: initial import of event-based implementation

Makefile.dep

@@ -801,6 +801,11 @@ ifneq (,$(filter vfs,$(USEMODULE)))
   endif
 endif
 
+ifneq (,$(filter sock_async_event,$(USEMODULE)))
+  USEMODULE += sock_async
+  USEMODULE += event
+endif
+
 ifneq (,$(filter sock_dns,$(USEMODULE)))
   USEMODULE += sock_util
   USEMODULE += posix_headers

sys/Makefile

@@ -112,6 +112,9 @@ endif
 ifneq (,$(filter emcute,$(USEMODULE)))
   DIRS += net/application_layer/emcute
 endif
+ifneq (,$(filter sock_async_event,$(USEMODULE)))
+  DIRS += net/sock/async/event
+endif
 ifneq (,$(filter sock_util,$(USEMODULE)))
   DIRS += net/sock
 endif

sys/Makefile.include

@@ -96,6 +96,10 @@ ifneq (,$(filter riotboot,$(FEATURES_USED)))
   include $(RIOTBASE)/sys/riotboot/Makefile.include
 endif
 
+ifneq (,$(filter sock_async_event,$(USEMODULE)))
+  include $(RIOTBASE)/sys/net/sock/async/event/Makefile.include
+endif
+
 ifneq (,$(filter ssp,$(USEMODULE)))
   include $(RIOTBASE)/sys/ssp/Makefile.include
 endif

sys/include/net/sock/async/event.h

@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup        net_sock_async_event    Asynchronous sock with event API
+ * @ingroup         net_sock
+ * @brief           Provides an implementation of asynchronous sock for
+ *                  @ref sys_event
+ * @experimental    This API is still under development and should not be used
+ *                  in production yet.
+ *
+ * How To Use
+ * ----------
+ *
+ * You need to [include](@ref including-modules) at least one module that
+ * implements a [`sock` API](@ref net_sock) (e.g. `gnrc_sock_udp` and
+ * `gnrc_sock_async` for the [GNRC](@ref net_gnrc) implementation using UDP) and
+ * the module `sock_async_event` in your application's Makefile.
+ *
+ * For the following example [`sock_udp`](@ref net_sock_udp) is used. It is
+ * however easily adaptable for other `sock` types:
+ *
+ * ### An asynchronous UDP Echo server using the event API
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c}
+ * #include <stdio.h>
+ *
+ * #include "net/sock/udp.h"
+ * #include "net/sock/async/event.h"
+ *
+ * event_queue_t queue;
+ * uint8_t buf[128];
+ *
+ * void handler(sock_udp_t *sock, sock_async_flags_t type)
+ * {
+ *     if (type & SOCK_ASYNC_MSG_RECV) {
+ *         sock_udp_ep_t remote;
+ *         ssize_t res;
+ *
+ *         if ((res = sock_udp_recv(sock, buf, sizeof(buf), 0,
+ *                                  &remote)) >= 0) {
+ *             puts("Received a message");
+ *             if (sock_udp_send(sock, buf, res, &remote) < 0) {
+ *                 puts("Error sending reply");
+ *             }
+ *         }
+ *     }
+ * }
+ *
+ * int main(void)
+ * {
+ *     sock_udp_ep_t local = SOCK_IPV6_EP_ANY;
+ *     sock_udp_t sock;
+ *
+ *     local.port = 12345;
+ *
+ *     if (sock_udp_create(&sock, &local, NULL, 0) < 0) {
+ *         puts("Error creating UDP sock");
+ *         return 1;
+ *     }
+ *
+ *     event_queue_init(&queue);
+ *     sock_udp_event_init(&sock, &queue, handler);
+ *     event_loop(&queue);
+ *     return 0;
+ * }
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Above you see a simple UDP echo server using @ref sys_event. Don't forget to
+ * also @ref including-modules "include" the IPv6 module of your networking
+ * implementation (e.g. `gnrc_ipv6_default` for @ref net_gnrc GNRC) and at least
+ * one network device.
+ *
+ * After including the header file for @ref net_sock_udp "UDP sock" and
+ * @ref net_sock_async_event "asynchronous handling", we create the event queue
+ * `queue` and allocate some buffer space `buf` to store the data received by
+ * the server:
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c}
+ * #include "net/sock/udp.h"
+ * #include "net/sock/async/event.h"
+ *
+ * event_queue_t queue;
+ * uint8_t buf[128];
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * We then define an event handler in form of a function. The event handler
+ * checks if the triggering event was a receive event by checking the flags
+ * provided with sock_event_t::type. If it is a receive event it copies the
+ * incoming message to `buf` and its sender into `remote` using @ref
+ * sock_udp_recv(). Note, that we use @ref sock_udp_recv() non-blocking by
+ * setting `timeout` to 0. If an error occurs on receive, we just ignore it and
+ * return from the event handler.
+ *
+ * If we receive a message we use its `remote` to reply. In case of an error on
+ * send, we print an according message:
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c}
+ * void handler(sock_udp_t *sock, sock_async_flags_t type)
+ * {
+ *     if (type & SOCK_ASYNC_MSG_RECV) {
+ *         sock_udp_ep_t remote;
+ *         ssize_t res;
+ *
+ *         if ((res = sock_udp_recv(sock, buf, sizeof(buf), 0,
+ *                                  &remote)) >= 0) {
+ *             puts("Received a message");
+ *             if (sock_udp_send(sock, buf, res, &remote) < 0) {
+ *                 puts("Error sending reply");
+ *             }
+ *         }
+ *     }
+ * }
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * To be able to listen for incoming packets we bind the `sock` by setting a
+ * local end point with a port (`12345` in this case).
+ *
+ * We then proceed to create the `sock`. It is bound to `local` and thus listens
+ * for UDP packets with @ref udp_hdr_t::dst_port "destination port" `12345`.
+ * Since we don't need any further configuration we set the flags to 0.
+ * In case of an error we stop the program:
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c}
+ *     sock_udp_ep_t local = SOCK_IPV6_EP_ANY;
+ *     sock_udp_t sock;
+ *
+ *     local.port = 12345;
+ *
+ *     if (sock_udp_create(&sock, &local, NULL, 0) < 0) {
+ *         puts("Error creating UDP sock");
+ *         return 1;
+ *     }
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Finally, we initialize the event queue `queue`, initialize asynchronous event
+ * handling for `sock` using it and the previously defined event handler, and go
+ * into an endless loop to handle all occurring events on `queue`:
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.c}
+ *     event_queue_init(&queue);
+ *     sock_udp_event_init(&sock, &queue, handler);
+ *     event_loop(&queue);
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * @{
+ *
+ * @file
+ * @brief   Asynchronous sock using @ref sys_event definitions.
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ * @author  Kaspar Schleiser <kaspar@schleiser.de>
+ */
+#ifndef NET_SOCK_ASYNC_EVENT_H
+#define NET_SOCK_ASYNC_EVENT_H
+
+#include "event.h"
+/* guard required since `sock_dtls_types.h` might not be provided */
+#ifdef MODULE_SOCK_DTLS
+#include "net/sock/dtls.h"
+#endif  /* MODULE_SOCK_DTLS */
+#include "net/sock/ip.h"
+#include "net/sock/tcp.h"
+#include "net/sock/udp.h"
+#include "net/sock/async.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* guard required since `sock_dtls_types.h` might not be provided */
+#if defined(MODULE_SOCK_DTLS) || defined(DOXYGEN)
+/**
+ * @brief   Makes a DTLS sock able to handle asynchronous events using
+ *          @ref sys_event.
+ *
+ * @param[in] sock      A DTLS sock object.
+ * @param[in] ev_queue  The queue the events on @p sock will be added to.
+ * @param[in] handler   The event handler function to call on an event on
+ *                      @p sock.
+ *
+ * @note    Only available with module `sock_dtls`.
+ */
+void sock_dtls_event_init(sock_dtls_t *sock, event_queue_t *ev_queue,
+                          sock_dtls_cb_t handler);
+#endif  /* defined(MODULE_SOCK_DTLS) || defined(DOXYGEN) */
+
+#if defined(MODULE_SOCK_IP) || defined(DOXYGEN)
+/**
+ * @brief   Makes a raw IPv4/IPv6 sock able to handle asynchronous events using
+ *          @ref sys_event.
+ *
+ * @param[in] sock      A raw IPv4/IPv6 sock object.
+ * @param[in] ev_queue  The queue the events on @p sock will be added to.
+ * @param[in] handler   The event handler function to call on an event on
+ *                      @p sock.
+ *
+ * @note    Only available with module `sock_ip`.
+ */
+void sock_ip_event_init(sock_ip_t *sock, event_queue_t *ev_queue,
+                        sock_ip_cb_t handler);
+#endif  /* defined(MODULE_SOCK_IP) || defined(DOXYGEN) */
+
+#if defined(MODULE_SOCK_TCP) || defined(DOXYGEN)
+/**
+ * @brief   Makes a TCP sock able to handle asynchronous events using
+ *          @ref sys_event.
+ *
+ * @param[in] sock      A TCP sock object.
+ * @param[in] ev_queue  The queue the events on @p sock will be added to.
+ * @param[in] handler   The event handler function to call on an event on
+ *                      @p sock.
+ *
+ * @note    Only available with module `sock_tcp`.
+ */
+void sock_tcp_event_init(sock_tcp_t *sock, event_queue_t *ev_queue,
+                         sock_tcp_cb_t handler);
+
+/**
+ * @brief   Makes a TCP listening queue able to handle asynchronous events using
+ *          @ref sys_event.
+ *
+ * @param[in] queue     A TCP listening queue.
+ * @param[in] ev_queue  The queue the events on @p sock will be added to.
+ * @param[in] handler   The event handler function to call on an event on
+ *                      @p sock.
+ *
+ * @note    Only available with module `sock_tcp`.
+ */
+void sock_tcp_queue_event_init(sock_tcp_queue_t *queue, event_queue_t *ev_queue,
+                               sock_tcp_queue_cb_t handler);
+#endif  /* defined(MODULE_SOCK_TCP) || defined(DOXYGEN) */
+
+#if defined(MODULE_SOCK_UDP) || defined(DOXYGEN)
+/**
+ * @brief   Makes a UDP sock able to handle asynchronous events using
+ *          @ref sys_event.
+ *
+ * @param[in] sock      A UDP sock object.
+ * @param[in] ev_queue  The queue the events on @p sock will be added to.
+ * @param[in] handler   The event handler function to call on an event on
+ *                      @p sock.
+ *
+ * @note    Only available with module `sock_udp`.
+ */
+void sock_udp_event_init(sock_udp_t *sock, event_queue_t *ev_queue,
+                         sock_udp_cb_t handler);
+#endif  /* defined(MODULE_SOCK_UDP) || defined(DOXYGEN) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_SOCK_ASYNC_EVENT_H */
+/** @} */

sys/net/sock/async/event/Makefile

@@ -0,0 +1,3 @@
+MODULE := sock_async_event
+
+include $(RIOTBASE)/Makefile.base

sys/net/sock/async/event/Makefile.include

@@ -0,0 +1,2 @@
+USEMODULE_INCLUDES += $(RIOTBASE)/sys/net/sock/async/event
+CFLAGS += -DSOCK_HAS_ASYNC -DSOCK_HAS_ASYNC_CTX

sys/net/sock/async/event/sock_async_ctx.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @addtogroup  net_sock_async_event
+ * @{
+ *
+ * @file
+ * @brief   Type definitions for asynchronous socks with @ref sys_event
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ */
+#ifndef SOCK_ASYNC_CTX_H
+#define SOCK_ASYNC_CTX_H
+
+#include "event.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Generalized callback type
+ */
+typedef union {
+    void (*generic)(void *, sock_async_flags_t);    /**< anything goes */
+#ifdef MODULE_SOCK_DTLS
+    sock_dtls_cb_t dtls;                            /**< DTLS callback */
+#endif
+#ifdef MODULE_SOCK_IP
+    sock_ip_cb_t ip;                                /**< IP callback */
+#endif
+#ifdef MODULE_SOCK_TCP
+    sock_tcp_cb_t tcp;                              /**< TCP callback */
+    sock_tcp_queue_cb_t tcp_queue;                  /**< TCP queue callback */
+#endif
+#ifdef MODULE_SOCK_UDP
+    sock_udp_cb_t udp;                              /**< UDP callback */
+#endif
+} sock_event_cb_t;
+
+/**
+ * @brief   Event definition for context scope
+ */
+typedef struct {
+    event_t super;              /**< event structure that gets extended */
+    sock_event_cb_t cb;         /**< callback */
+    void *sock;                 /**< generic pointer to a @ref net_sock object */
+    sock_async_flags_t type;    /**< types of the event */
+} sock_event_t;
+
+/**
+ * @brief   Asynchronous context for @ref net_sock_async_event
+ */
+typedef struct {
+    sock_event_t event;     /**< event storage */
+    event_queue_t *queue;   /**< event queue to post socket events to */
+} sock_async_ctx_t;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SOCK_ASYNC_CTX_H */
+/** @} */

sys/net/sock/async/event/sock_async_event.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ */
+
+#include "net/sock/async/event.h"
+
+static void _event_handler(event_t *ev)
+{
+    sock_event_t *event = (sock_event_t *)ev;
+
+    event->cb.generic(event->sock, event->type);
+    event->type = 0;
+}
+
+static inline void _cb(void *sock, sock_async_flags_t type,
+                       sock_async_ctx_t *ctx)
+{
+    ctx->event.sock = sock;
+    ctx->event.type |= type;
+    event_post(ctx->queue, &ctx->event.super);
+}
+
+static void _set_ctx(sock_async_ctx_t *ctx, event_queue_t *ev_queue)
+{
+    ctx->event.type = 0;
+    ctx->event.super.list_node.next = NULL;
+    ctx->event.super.handler = _event_handler;
+    ctx->queue = ev_queue;
+}
+
+#ifdef MODULE_SOCK_DTLS
+static void _dtls_cb(sock_dtls_t *sock, sock_async_flags_t type)
+{
+    _cb(sock, type, sock_dtls_get_async_ctx(sock));
+}
+
+void sock_dtls_event_init(sock_dtls_t *sock, event_queue_t *ev_queue,
+                         sock_dtls_cb_t handler)
+{
+    sock_async_ctx_t *ctx = sock_dtls_get_async_ctx(sock);
+
+    _set_ctx(ctx, ev_queue);
+    ctx->event.cb.dtls = handler;
+    sock_dtls_set_cb(sock, _dtls_cb);
+}
+#endif /* MODULE_SOCK_DTLS */
+
+#ifdef MODULE_SOCK_IP
+static void _ip_cb(sock_ip_t *sock, sock_async_flags_t type)
+{
+    _cb(sock, type, sock_ip_get_async_ctx(sock));
+}
+
+void sock_ip_event_init(sock_ip_t *sock, event_queue_t *ev_queue,
+                        sock_ip_cb_t handler)
+{
+    sock_async_ctx_t *ctx = sock_ip_get_async_ctx(sock);
+
+    _set_ctx(ctx, ev_queue);
+    ctx->event.cb.ip = handler;
+    sock_ip_set_cb(sock, _ip_cb);
+}
+#endif  /* MODULE_SOCK_IP */
+
+#ifdef MODULE_SOCK_TCP
+static void _tcp_cb(sock_tcp_t *sock, sock_async_flags_t type)
+{
+    _cb(sock, type, sock_tcp_get_async_ctx(sock));
+}
+
+void sock_tcp_event_init(sock_tcp_t *sock, event_queue_t *ev_queue,
+                         sock_tcp_cb_t handler)
+{
+    sock_async_ctx_t *ctx = sock_tcp_get_async_ctx(sock);
+
+    _set_ctx(ctx, ev_queue);
+    ctx->event.cb.tcp = handler;
+    sock_tcp_set_cb(sock, _tcp_cb);
+}
+
+static void _tcp_queue_cb(sock_tcp_queue_t *queue, sock_async_flags_t type)
+{
+    _cb(queue, type, sock_tcp_queue_get_async_ctx(queue));
+}
+
+void sock_tcp_queue_event_init(sock_tcp_queue_t *queue,
+                               event_queue_t *ev_queue,
+                               sock_tcp_queue_cb_t handler)
+{
+    sock_async_ctx_t *ctx = sock_tcp_queue_get_async_ctx(sock);
+
+    _set_ctx(ctx, ev_queue);
+    ctx->event.cb.tcp_queue = handler;
+    sock_tcp_queue_set_cb(queue, _tcp_queue_cb);
+}
+#endif /* MODULE_SOCK_TCP */
+
+#ifdef MODULE_SOCK_UDP
+static void _udp_cb(sock_udp_t *sock, sock_async_flags_t type)
+{
+    _cb(sock, type, sock_udp_get_async_ctx(sock));
+}
+
+void sock_udp_event_init(sock_udp_t *sock, event_queue_t *ev_queue,
+                         sock_udp_cb_t handler)
+{
+    sock_async_ctx_t *ctx = sock_udp_get_async_ctx(sock);
+
+    _set_ctx(ctx, ev_queue);
+    ctx->event.cb.udp = handler;
+    sock_udp_set_cb(sock, _udp_cb);
+}
+#endif /* MODULE_SOCK_UDP */
+
+/** @} */