--- /dev/null
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#define NO_PLUGIN_VERBOSE_MACRO
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <endian.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <json-c/json.h>
+#include <systemd/sd-event.h>
+
+#include <afb/afb-req-itf.h>
+
+#include "afb-common.h"
+
+#include "session.h"
+#include "afb-ws.h"
+#include "afb-msg-json.h"
+#include "afb-apis.h"
+#include "afb-api-so.h"
+#include "afb-context.h"
+#include "afb-evt.h"
+#include "afb-subcall.h"
+#include "verbose.h"
+
+struct api_ws_memo;
+struct api_ws_event;
+struct api_ws_client;
+
+
+
+/*
+ */
+struct api_ws
+{
+ char *path; /* path of the object for the API */
+ char *api; /* api name of the interface */
+ int fd; /* file descriptor */
+ union {
+ struct {
+ uint32_t id;
+ struct afb_ws *ws;
+ struct api_ws_event *events;
+ struct api_ws_memo *memos;
+ } client;
+ struct {
+ sd_event_source *listensrc;
+ struct afb_evt_listener *listener; /* listener for broadcasted events */
+ } server;
+ };
+};
+
+#define RETOK 1
+#define RETERR 2
+#define RETRAW 3
+
+/******************* websocket interface for client part **********************************/
+
+static void api_ws_client_on_binary(void *closure, char *data, size_t size);
+
+static const struct afb_ws_itf api_ws_client_ws_itf =
+{
+ .on_close = NULL,
+ .on_text = NULL,
+ .on_binary = api_ws_client_on_binary,
+ .on_error = NULL,
+ .on_hangup = NULL
+};
+
+/******************* event structures for server part **********************************/
+
+static void api_ws_server_event_add(void *closure, const char *event, int eventid);
+static void api_ws_server_event_remove(void *closure, const char *event, int eventid);
+static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object);
+static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object);
+
+/* the interface for events pushing */
+static const struct afb_evt_itf api_ws_server_evt_itf = {
+ .broadcast = api_ws_server_event_broadcast,
+ .push = api_ws_server_event_push,
+ .add = api_ws_server_event_add,
+ .remove = api_ws_server_event_remove
+};
+
+/******************* client description part for server *****************************/
+
+struct api_ws_client
+{
+ /* the server ws-api */
+ const char *api;
+
+ /* count of references */
+ int refcount;
+
+ /* listener for events */
+ struct afb_evt_listener *listener;
+
+ /* file descriptor */
+ int fd;
+
+ /* websocket */
+ struct afb_ws *ws;
+};
+
+/******************* websocket interface for client part **********************************/
+
+static void api_ws_server_on_binary(void *closure, char *data, size_t size);
+static void api_ws_server_on_hangup(void *closure);
+
+static const struct afb_ws_itf api_ws_server_ws_itf =
+{
+ .on_close = NULL,
+ .on_text = NULL,
+ .on_binary = api_ws_server_on_binary,
+ .on_error = NULL,
+ .on_hangup = api_ws_server_on_hangup
+};
+
+/******************* ws request part for server *****************/
+
+/*
+ * structure for a ws request
+ */
+struct api_ws_server_req {
+ struct afb_context context; /* the context, should be THE FIRST */
+ struct api_ws_client *client; /* the client of the request */
+ char *rcvdata; /* the received data to free */
+ struct json_object *json; /* the readen request as object */
+ const char *request; /* the readen request as string */
+ size_t lenreq; /* the length of the request */
+ int refcount; /* reference count of the request */
+ uint32_t msgid; /* the incoming request msgid */
+};
+
+static struct json_object *api_ws_server_req_json(struct api_ws_server_req *wreq);
+static struct afb_arg api_ws_server_req_get(struct api_ws_server_req *wreq, const char *name);
+static void api_ws_server_req_success(struct api_ws_server_req *wreq, struct json_object *obj, const char *info);
+static void api_ws_server_req_fail(struct api_ws_server_req *wreq, const char *status, const char *info);
+static const char *api_ws_server_req_raw(struct api_ws_server_req *wreq, size_t *size);
+static void api_ws_server_req_send(struct api_ws_server_req *wreq, const char *buffer, size_t size);
+static void api_ws_server_req_addref(struct api_ws_server_req *wreq);
+static void api_ws_server_req_unref(struct api_ws_server_req *wreq);
+static int api_ws_server_req_subscribe(struct api_ws_server_req *wreq, struct afb_event event);
+static int api_ws_server_req_unsubscribe(struct api_ws_server_req *wreq, struct afb_event event);
+static void api_ws_server_req_subcall(struct api_ws_server_req *wreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure);
+
+const struct afb_req_itf afb_api_ws_req_itf = {
+ .json = (void*)api_ws_server_req_json,
+ .get = (void*)api_ws_server_req_get,
+ .success = (void*)api_ws_server_req_success,
+ .fail = (void*)api_ws_server_req_fail,
+ .raw = (void*)api_ws_server_req_raw,
+ .send = (void*)api_ws_server_req_send,
+ .context_get = (void*)afb_context_get,
+ .context_set = (void*)afb_context_set,
+ .addref = (void*)api_ws_server_req_addref,
+ .unref = (void*)api_ws_server_req_unref,
+ .session_close = (void*)afb_context_close,
+ .session_set_LOA = (void*)afb_context_change_loa,
+ .subscribe = (void*)api_ws_server_req_subscribe,
+ .unsubscribe = (void*)api_ws_server_req_unsubscribe,
+ .subcall = (void*)api_ws_server_req_subcall
+};
+
+/******************* common part **********************************/
+
+/*
+ * create a structure api_ws not connected to the 'path'.
+ */
+static struct api_ws *api_ws_make(const char *path)
+{
+ struct api_ws *api;
+ size_t length;
+
+ /* allocates the structure */
+ length = strlen(path);
+ api = calloc(1, sizeof *api + 1 + length);
+ if (api == NULL) {
+ errno = ENOMEM;
+ goto error;
+ }
+
+ /* path is copied after the struct */
+ api->path = (void*)(api+1);
+ memcpy(api->path, path, length + 1);
+
+ /* api name is at the end of the path */
+ api->api = strrchr(api->path, '/');
+ if (api->api == NULL || !afb_apis_is_valid_api_name(++api->api)) {
+ errno = EINVAL;
+ goto error2;
+ }
+
+ api->fd = -1;
+ return api;
+
+error2:
+ free(api);
+error:
+ return NULL;
+}
+
+static int api_ws_socket_unix(const char *path, int server)
+{
+ int fd, rc;
+ struct sockaddr_un addr;
+ size_t length;
+
+ length = strlen(path);
+ if (length >= 108) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+
+ if (server)
+ unlink(path);
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0)
+ return fd;
+
+ memset(&addr, 0, sizeof addr);
+ addr.sun_family = AF_UNIX;
+ strcpy(addr.sun_path, path);
+ if (server) {
+ rc = bind(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
+ } else {
+ rc = connect(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
+ }
+ if (rc < 0) {
+ close(fd);
+ return rc;
+ }
+ return fd;
+}
+
+static int api_ws_socket_inet(const char *path, int server)
+{
+ int rc, fd;
+ const char *service, *host, *api;
+ struct addrinfo hint, *rai, *iai;
+
+ /* scan the uri */
+ api = strrchr(path, '/');
+ service = strrchr(path, ':');
+ if (api == NULL || service == NULL || api < service) {
+ errno = EINVAL;
+ return -1;
+ }
+ host = strndupa(path, service++ - path);
+ service = strndupa(service, api - service);
+
+ /* get addr */
+ memset(&hint, 0, sizeof hint);
+ hint.ai_family = AF_INET;
+ hint.ai_socktype = SOCK_STREAM;
+ rc = getaddrinfo(host, service, &hint, &rai);
+ if (rc != 0) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ /* get the socket */
+ iai = rai;
+ while (iai != NULL) {
+ fd = socket(iai->ai_family, iai->ai_socktype, iai->ai_protocol);
+ if (fd >= 0) {
+ if (server) {
+ rc = bind(fd, iai->ai_addr, iai->ai_addrlen);
+ } else {
+ rc = connect(fd, iai->ai_addr, iai->ai_addrlen);
+ }
+ if (rc == 0) {
+ freeaddrinfo(rai);
+ return fd;
+ }
+ close(fd);
+ }
+ iai = iai->ai_next;
+ }
+ freeaddrinfo(rai);
+ return -1;
+
+}
+
+static int api_ws_socket(const char *path, int server)
+{
+ int fd, rc;
+
+ /* check for unix socket */
+ if (0 == strncmp(path, "unix:", 5))
+ fd = api_ws_socket_unix(path + 5, server);
+ else
+ fd = api_ws_socket_inet(path, server);
+
+ if (fd >= 0) {
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+ if (server) {
+ rc = 1;
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &rc, sizeof rc);
+ rc = listen(fd, 5);
+ }
+ }
+ return fd;
+}
+
+/******************* serialisation part **********************************/
+
+struct readbuf
+{
+ char *head, *end;
+};
+
+#define WRITEBUF_COUNT_MAX 32
+struct writebuf
+{
+ struct iovec iovec[WRITEBUF_COUNT_MAX];
+ uint32_t uints[WRITEBUF_COUNT_MAX];
+ int count;
+};
+
+static char *api_ws_read_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;
+}
+
+static int api_ws_read_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;
+}
+
+static int api_ws_read_string(struct readbuf *rb, const char **value, size_t *length)
+{
+ uint32_t len;
+ if (!api_ws_read_uint32(rb, &len) || !len)
+ return 0;
+ if (length)
+ *length = (size_t)(len - 1);
+ return (*value = api_ws_read_get(rb, len)) != NULL && rb->head[-1] == 0;
+}
+
+static int api_ws_read_object(struct readbuf *rb, struct json_object **object)
+{
+ size_t length;
+ const char *string;
+ return api_ws_read_string(rb, &string, &length) && ((*object = json_tokener_parse(string)) != NULL) == (strcmp(string, "null") != 0);
+}
+
+static int api_ws_write_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 api_ws_write_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;
+}
+
+static int api_ws_write_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;
+}
+
+static int api_ws_write_string_nz(struct writebuf *wb, const char *value, size_t length)
+{
+ uint32_t len = (uint32_t)length;
+ return (size_t)len == length && ++len && api_ws_write_uint32(wb, len) && api_ws_write_put(wb, value, length) && api_ws_write_char(wb, '\0');
+}
+
+static int api_ws_write_string_length(struct writebuf *wb, const char *value, size_t length)
+{
+ uint32_t len = (uint32_t)++length;
+ return (size_t)len == length && len && api_ws_write_uint32(wb, len) && api_ws_write_put(wb, value, length);
+}
+
+static int api_ws_write_string(struct writebuf *wb, const char *value)
+{
+ return api_ws_write_string_length(wb, value, strlen(value));
+}
+
+static int api_ws_write_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 && api_ws_write_string(wb, string);
+}
+
+
+
+
+/******************* client part **********************************/
+
+/*
+ * structure for recording query data
+ */
+struct api_ws_memo {
+ struct api_ws_memo *next; /* the next memo */
+ struct api_ws *api; /* the ws api */
+ struct afb_req req; /* the request handle */
+ struct afb_context *context; /* the context of the query */
+ uint32_t msgid; /* the message identifier */
+};
+
+struct api_ws_event
+{
+ struct api_ws_event *next;
+ struct afb_event event;
+ int eventid;
+ int refcount;
+};
+
+/* search a memorized request */
+static struct api_ws_memo *api_ws_client_memo_search(struct api_ws *api, uint32_t msgid)
+{
+ struct api_ws_memo *memo;
+
+ memo = api->client.memos;
+ while (memo != NULL && memo->msgid != msgid)
+ memo = memo->next;
+
+ return memo;
+}
+
+/* search the event */
+static struct api_ws_event *api_ws_client_event_search(struct api_ws *api, uint32_t eventid, const char *name)
+{
+ struct api_ws_event *ev;
+
+ ev = api->client.events;
+ while (ev != NULL && (ev->eventid != eventid || 0 != strcmp(afb_evt_event_name(ev->event), name)))
+ ev = ev->next;
+
+ return ev;
+}
+
+
+/* allocates and init the memorizing data */
+static struct api_ws_memo *api_ws_client_memo_make(struct api_ws *api, struct afb_req req, struct afb_context *context)
+{
+ struct api_ws_memo *memo;
+
+ memo = malloc(sizeof *memo);
+ if (memo != NULL) {
+ afb_req_addref(req);
+ memo->req = req;
+ memo->context = context;
+ do { memo->msgid = ++api->client.id; } while(api_ws_client_memo_search(api, memo->msgid) != NULL);
+ memo->api = api;
+ memo->next = api->client.memos;
+ api->client.memos = memo;
+ }
+ return memo;
+}
+
+/* free and release the memorizing data */
+static void api_ws_client_memo_destroy(struct api_ws_memo *memo)
+{
+ struct api_ws_memo **prv;
+
+ prv = &memo->api->client.memos;
+ while (*prv != NULL) {
+ if (*prv == memo) {
+ *prv = memo->next;
+ break;
+ }
+ prv = &(*prv)->next;
+ }
+
+ afb_req_unref(memo->req);
+ free(memo);
+}
+
+/* get event data from the message */
+static int api_ws_client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name)
+{
+ return api_ws_read_uint32(rb, eventid) && api_ws_read_string(rb, name, NULL);
+}
+
+/* get event from the message */
+static int api_ws_client_msg_event_get(struct api_ws *api, struct readbuf *rb, struct api_ws_event **ev)
+{
+ const char *name;
+ uint32_t eventid;
+
+ /* get event data from the message */
+ if (!api_ws_client_msg_event_read(rb, &eventid, &name)) {
+ ERROR("Invalid message");
+ return 0;
+ }
+
+ /* check conflicts */
+ *ev = api_ws_client_event_search(api, eventid, name);
+ if (*ev == NULL) {
+ ERROR("event %s not found", name);
+ return 0;
+ }
+
+ return 1;
+}
+
+/* get event from the message */
+static int api_ws_client_msg_memo_get(struct api_ws *api, struct readbuf *rb, struct api_ws_memo **memo)
+{
+ uint32_t msgid;
+
+ /* get event data from the message */
+ if (!api_ws_read_uint32(rb, &msgid)) {
+ ERROR("Invalid message");
+ return 0;
+ }
+
+ /* get the memo */
+ *memo = api_ws_client_memo_search(api, msgid);
+ if (*memo == NULL) {
+ ERROR("message not found");
+ return 0;
+ }
+
+ return 1;
+}
+
+/* read a subscrition message */
+static int api_ws_client_msg_subscription_get(struct api_ws *api, struct readbuf *rb, struct api_ws_event **ev, struct api_ws_memo **memo)
+{
+ return api_ws_client_msg_memo_get(api, rb, memo) && api_ws_client_msg_event_get(api, rb, ev);
+}
+
+/* adds an event */
+static void api_ws_client_event_create(struct api_ws *api, struct readbuf *rb)
+{
+ size_t offset;
+ const char *name;
+ uint32_t eventid;
+ struct api_ws_event *ev;
+
+ /* get event data from the message */
+ offset = api_ws_client_msg_event_read(rb, &eventid, &name);
+ if (offset == 0) {
+ ERROR("Invalid message");
+ return;
+ }
+
+ /* check conflicts */
+ ev = api_ws_client_event_search(api, eventid, name);
+ if (ev != NULL) {
+ ev->refcount++;
+ return;
+ }
+
+ /* 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 = api->client.events;
+ api->client.events = ev;
+ return;
+ }
+ }
+ ERROR("can't create event %s, out of memory", name);
+}
+
+/* removes an event */
+static void api_ws_client_event_drop(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_event *ev, **prv;
+
+ /* retrieves the event */
+ if (!api_ws_client_msg_event_get(api, rb, &ev))
+ return;
+
+ /* decrease the reference count */
+ if (--ev->refcount)
+ return;
+
+ /* unlinks the event */
+ prv = &api->client.events;
+ while (*prv != ev)
+ prv = &(*prv)->next;
+ *prv = ev->next;
+
+ /* destroys the event */
+ afb_event_drop(ev->event);
+ free(ev);
+}
+
+/* subscribes an event */
+static void api_ws_client_event_subscribe(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_event *ev;
+ struct api_ws_memo *memo;
+
+ if (api_ws_client_msg_subscription_get(api, rb, &ev, &memo)) {
+ /* subscribe the request from the event */
+ if (afb_req_subscribe(memo->req, ev->event) < 0)
+ ERROR("can't subscribe: %m");
+ }
+}
+
+/* unsubscribes an event */
+static void api_ws_client_event_unsubscribe(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_event *ev;
+ struct api_ws_memo *memo;
+
+ if (api_ws_client_msg_subscription_get(api, rb, &ev, &memo)) {
+ /* unsubscribe the request from the event */
+ if (afb_req_unsubscribe(memo->req, ev->event) < 0)
+ ERROR("can't unsubscribe: %m");
+ }
+}
+
+/* receives broadcasted events */
+static void api_ws_client_event_broadcast(struct api_ws *api, struct readbuf *rb)
+{
+ struct json_object *object;
+ const char *event;
+
+ if (api_ws_read_string(rb, &event, NULL) && api_ws_read_object(rb, &object))
+ afb_evt_broadcast(event, object);
+ else
+ ERROR("unreadable broadcasted event");
+}
+
+/* pushs an event */
+static void api_ws_client_event_push(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_event *ev;
+ struct json_object *object;
+
+ if (api_ws_client_msg_event_get(api, rb, &ev) && api_ws_read_object(rb, &object))
+ afb_event_push(ev->event, object);
+ else
+ ERROR("unreadable push event");
+}
+
+static void api_ws_client_reply_success(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_memo *memo;
+ struct json_object *object;
+ const char *info;
+ uint32_t flags;
+
+ /* retrieve the message data */
+ if (!api_ws_client_msg_memo_get(api, rb, &memo))
+ return;
+
+ if (api_ws_read_uint32(rb, &flags)
+ && api_ws_read_string(rb, &info, NULL)
+ && api_ws_read_object(rb, &object)) {
+ memo->context->flags = (unsigned)flags;
+ afb_req_success(memo->req, object, *info ? info : NULL);
+ } else {
+ /* failing to have the answer */
+ afb_req_fail(memo->req, "error", "ws error");
+ }
+ api_ws_client_memo_destroy(memo);
+}
+
+static void api_ws_client_reply_fail(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_memo *memo;
+ const char *info, *status;
+ uint32_t flags;
+
+ /* retrieve the message data */
+ if (!api_ws_client_msg_memo_get(api, rb, &memo))
+ return;
+
+ if (api_ws_read_uint32(rb, &flags)
+ && api_ws_read_string(rb, &status, NULL)
+ && api_ws_read_string(rb, &info, NULL)) {
+ memo->context->flags = (unsigned)flags;
+ afb_req_fail(memo->req, status, *info ? info : NULL);
+ } else {
+ /* failing to have the answer */
+ afb_req_fail(memo->req, "error", "ws error");
+ }
+ api_ws_client_memo_destroy(memo);
+}
+
+static void api_ws_client_reply_send(struct api_ws *api, struct readbuf *rb)
+{
+ struct api_ws_memo *memo;
+ const char *data;
+ size_t length;
+ uint32_t flags;
+
+ /* retrieve the message data */
+ if (!api_ws_client_msg_memo_get(api, rb, &memo))
+ return;
+
+ if (api_ws_read_uint32(rb, &flags)
+ && api_ws_read_string(rb, &data, &length)) {
+ memo->context->flags = (unsigned)flags;
+ afb_req_send(memo->req, data, length);
+ } else {
+ /* failing to have the answer */
+ afb_req_fail(memo->req, "error", "ws error");
+ }
+ api_ws_client_memo_destroy(memo);
+}
+
+/* callback when receiving binary data */
+static void api_ws_client_on_binary(void *closure, char *data, size_t size)
+{
+ if (size > 0) {
+ struct readbuf rb = { .head = data, .end = data + size };
+ switch (*rb.head++) {
+ case 'T': /* success */
+ api_ws_client_reply_success(closure, &rb);
+ break;
+ case 'F': /* fail */
+ api_ws_client_reply_fail(closure, &rb);
+ break;
+ case 'X': /* send */
+ api_ws_client_reply_send(closure, &rb);
+ break;
+ case '*': /* broadcast */
+ api_ws_client_event_broadcast(closure, &rb);
+ break;
+ case '+': /* creates the event */
+ api_ws_client_event_create(closure, &rb);
+ break;
+ case '-': /* drops the event */
+ api_ws_client_event_drop(closure, &rb);
+ break;
+ case '!': /* pushs the event */
+ api_ws_client_event_push(closure, &rb);
+ break;
+ case 'S': /* subscribe event for a request */
+ api_ws_client_event_subscribe(closure, &rb);
+ break;
+ case 'U': /* unsubscribe event for a request */
+ api_ws_client_event_unsubscribe(closure, &rb);
+ break;
+ default: /* unexpected message */
+ break;
+ }
+ }
+}
+
+/* on call, propagate it to the ws service */
+static void api_ws_client_call(struct api_ws *api, struct afb_req req, struct afb_context *context, const char *verb, size_t lenverb)
+{
+ int rc;
+ struct api_ws_memo *memo;
+ struct writebuf wb = { .count = 0 };
+ const char *raw;
+ size_t szraw;
+
+ /* create the recording data */
+ memo = api_ws_client_memo_make(api, req, context);
+ if (memo == NULL) {
+ afb_req_fail(req, "error", "out of memory");
+ return;
+ }
+
+ /* creates the call message */
+ raw = afb_req_raw(req, &szraw);
+ if (raw == NULL)
+ goto internal_error;
+ if (!api_ws_write_uint32(&wb, memo->msgid)
+ || !api_ws_write_uint32(&wb, (uint32_t)context->flags)
+ || !api_ws_write_string_nz(&wb, verb, lenverb)
+ || !api_ws_write_string(&wb, ctxClientGetUuid(context->session))
+ || !api_ws_write_string_length(&wb, raw, szraw))
+ goto overflow;
+
+ /* send */
+ rc = afb_ws_binary_v(api->client.ws, wb.iovec, wb.count);
+ if (rc < 0)
+ goto ws_send_error;
+ return;
+
+ws_send_error:
+ afb_req_fail(req, "error", "websocket sending error");
+ goto clean_memo;
+
+internal_error:
+ afb_req_fail(req, "error", "internal: raw is NULL!");
+ goto clean_memo;
+
+overflow:
+ afb_req_fail(req, "error", "overflow: size doesn't match 32 bits!");
+
+clean_memo:
+ api_ws_client_memo_destroy(memo);
+}
+
+static int api_ws_service_start(struct api_ws *api, int share_session, int onneed)
+{
+ /* not an error when onneed */
+ if (onneed != 0)
+ return 0;
+
+ /* already started: it is an error */
+ ERROR("The WS binding %s is not a startable service", api->path);
+ return -1;
+}
+
+/* */
+static void api_ws_client_disconnect(struct api_ws *api)
+{
+ if (api->fd >= 0) {
+ afb_ws_destroy(api->client.ws);
+ api->client.ws = NULL;
+ close(api->fd);
+ api->fd = -1;
+ }
+}
+
+/* */
+static int api_ws_client_connect(struct api_ws *api)
+{
+ struct afb_ws *ws;
+ int fd;
+
+ fd = api_ws_socket(api->path, 0);
+ if (fd >= 0) {
+ ws = afb_ws_create(afb_common_get_event_loop(), fd, &api_ws_client_ws_itf, api);
+ if (ws != NULL) {
+ api->client.ws = ws;
+ api->fd = fd;
+ return 0;
+ }
+ close(fd);
+ }
+ return -1;
+}
+
+/* adds a afb-ws-service client api */
+int afb_api_ws_add_client(const char *path)
+{
+ int rc;
+ struct api_ws *api;
+ struct afb_api afb_api;
+
+ /* create the ws client api */
+ api = api_ws_make(path);
+ if (api == NULL)
+ goto error;
+
+ /* connect to the service */
+ rc = api_ws_client_connect(api);
+ if (rc < 0) {
+ ERROR("can't connect to ws service %s", api->path);
+ goto error2;
+ }
+
+ /* record it as an API */
+ afb_api.closure = api;
+ afb_api.call = (void*)api_ws_client_call;
+ afb_api.service_start = (void*)api_ws_service_start;
+ if (afb_apis_add(api->api, afb_api) < 0)
+ goto error3;
+
+ return 0;
+
+error3:
+ api_ws_client_disconnect(api);
+error2:
+ free(api);
+error:
+ return -1;
+}
+
+/******************* client description part for server *****************************/
+
+static void api_ws_server_client_unref(struct api_ws_client *client)
+{
+ if (!--client->refcount) {
+ afb_evt_listener_unref(client->listener);
+ afb_ws_destroy(client->ws);
+ free(client);
+ }
+}
+
+/* on call, propagate it to the ws service */
+static void api_ws_server_called(struct api_ws_client *client, struct readbuf *rb, char *data, size_t size)
+{
+ struct api_ws_server_req *wreq;
+ struct afb_req areq;
+ const char *uuid, *verb;
+ uint32_t flags;
+
+ client->refcount++;
+
+ /* create the request */
+ wreq = calloc(1 , sizeof *wreq);
+ if (wreq == NULL)
+ goto out_of_memory;
+
+ wreq->client = client;
+ wreq->rcvdata = data;
+ wreq->refcount = 1;
+
+ /* reads the call message data */
+ if (!api_ws_read_uint32(rb, &wreq->msgid)
+ || !api_ws_read_uint32(rb, &flags)
+ || !api_ws_read_string(rb, &verb, NULL)
+ || !api_ws_read_string(rb, &uuid, NULL)
+ || !api_ws_read_string(rb, &wreq->request, &wreq->lenreq))
+ goto overflow;
+
+ /* init the context */
+ if (afb_context_connect(&wreq->context, uuid, NULL) < 0)
+ goto out_of_memory;
+ wreq->context.flags = flags;
+
+ /* makes the call */
+ areq.itf = &afb_api_ws_req_itf;
+ areq.closure = wreq;
+ afb_apis_call_(areq, &wreq->context, client->api, verb);
+ api_ws_server_req_unref(wreq);
+ return;
+
+out_of_memory:
+overflow:
+ free(wreq);
+ free(data);
+ api_ws_server_client_unref(client);
+}
+
+/* callback when receiving binary data */
+static void api_ws_server_on_binary(void *closure, char *data, size_t size)
+{
+ struct readbuf rb = { .head = data, .end = data + size };
+ api_ws_server_called(closure, &rb, data, size);
+}
+
+/* callback when receiving a hangup */
+static void api_ws_server_on_hangup(void *closure)
+{
+ struct api_ws_client *client = closure;
+
+ /* close the socket */
+ if (client->fd >= 0) {
+ close(client->fd);
+ client->fd = -1;
+ }
+
+ /* release the client */
+ api_ws_server_client_unref(client);
+}
+
+static void api_ws_server_accept(struct api_ws *api)
+{
+ struct api_ws_client *client;
+ struct sockaddr addr;
+ socklen_t lenaddr;
+
+ client = calloc(1, sizeof *client);
+ if (client != NULL) {
+ client->listener = afb_evt_listener_create(&api_ws_server_evt_itf, client);
+ if (client->listener != NULL) {
+ lenaddr = (socklen_t)sizeof addr;
+ client->fd = accept(api->fd, &addr, &lenaddr);
+ if (client->fd >= 0) {
+ client->ws = afb_ws_create(afb_common_get_event_loop(), client->fd, &api_ws_server_ws_itf, client);
+ if (client->ws != NULL) {
+ client->api = api->api;
+ client->refcount = 1;
+ return;
+ }
+ close(client->fd);
+ }
+ afb_evt_listener_unref(client->listener);
+ }
+ free(client);
+ }
+}
+
+/******************* server part: manage events **********************************/
+
+static void api_ws_server_event_send(struct api_ws_client *client, char order, const char *event, int eventid, const char *data)
+{
+ int rc;
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, order)
+ && api_ws_write_uint32(&wb, eventid)
+ && api_ws_write_string(&wb, event)
+ && (data == NULL || api_ws_write_string(&wb, data))) {
+ rc = afb_ws_binary_v(client->ws, wb.iovec, wb.count);
+ if (rc >= 0)
+ return;
+ }
+ ERROR("error while sending %c for event %s", order, event);
+}
+
+static void api_ws_server_event_add(void *closure, const char *event, int eventid)
+{
+ api_ws_server_event_send(closure, '+', event, eventid, NULL);
+}
+
+static void api_ws_server_event_remove(void *closure, const char *event, int eventid)
+{
+ api_ws_server_event_send(closure, '-', event, eventid, NULL);
+}
+
+static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object)
+{
+ const char *data = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
+ api_ws_server_event_send(closure, '!', event, eventid, data ? : "null");
+ json_object_put(object);
+}
+
+static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object)
+{
+ int rc;
+ struct api_ws_client *client = closure;
+
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, '*') && api_ws_write_string(&wb, event) && api_ws_write_object(&wb, object)) {
+ rc = afb_ws_binary_v(client->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);
+}
+
+/******************* ws request part for server *****************/
+
+/* increment the reference count of the request */
+static void api_ws_server_req_addref(struct api_ws_server_req *wreq)
+{
+ wreq->refcount++;
+}
+
+/* decrement the reference count of the request and free/release it on falling to null */
+static void api_ws_server_req_unref(struct api_ws_server_req *wreq)
+{
+ if (wreq == NULL || --wreq->refcount)
+ return;
+
+ afb_context_disconnect(&wreq->context);
+ json_object_put(wreq->json);
+ free(wreq->rcvdata);
+ api_ws_server_client_unref(wreq->client);
+ free(wreq);
+}
+
+/* get the object of the request */
+static struct json_object *api_ws_server_req_json(struct api_ws_server_req *wreq)
+{
+ if (wreq->json == NULL) {
+ wreq->json = json_tokener_parse(wreq->request);
+ if (wreq->json == NULL && strcmp(wreq->request, "null")) {
+ /* lazy error detection of json request. Is it to improve? */
+ wreq->json = json_object_new_string(wreq->request);
+ }
+ }
+ return wreq->json;
+}
+
+/* get the argument of the request of 'name' */
+static struct afb_arg api_ws_server_req_get(struct api_ws_server_req *wreq, const char *name)
+{
+ return afb_msg_json_get_arg(api_ws_server_req_json(wreq), name);
+}
+
+static void api_ws_server_req_success(struct api_ws_server_req *wreq, struct json_object *obj, const char *info)
+{
+ int rc;
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, 'T')
+ && api_ws_write_uint32(&wb, wreq->msgid)
+ && api_ws_write_uint32(&wb, (uint32_t)wreq->context.flags)
+ && api_ws_write_string(&wb, info ? : "")
+ && api_ws_write_object(&wb, obj)) {
+ rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
+ if (rc >= 0)
+ goto success;
+ }
+ ERROR("error while sending success");
+success:
+ json_object_put(obj);
+}
+
+static void api_ws_server_req_fail(struct api_ws_server_req *wreq, const char *status, const char *info)
+{
+ int rc;
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, 'F')
+ && api_ws_write_uint32(&wb, wreq->msgid)
+ && api_ws_write_uint32(&wb, (uint32_t)wreq->context.flags)
+ && api_ws_write_string(&wb, status)
+ && api_ws_write_string(&wb, info ? : "")) {
+ rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
+ if (rc >= 0)
+ return;
+ }
+ ERROR("error while sending fail");
+}
+
+static const char *api_ws_server_req_raw(struct api_ws_server_req *wreq, size_t *size)
+{
+ if (size != NULL)
+ *size = wreq->lenreq;
+ return wreq->request;
+}
+
+static void api_ws_server_req_send(struct api_ws_server_req *wreq, const char *buffer, size_t size)
+{
+ /* TODO: how to put sized buffer as strings? things aren't clear here!!! */
+ int rc;
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, 'X')
+ && api_ws_write_uint32(&wb, wreq->msgid)
+ && api_ws_write_uint32(&wb, (uint32_t)wreq->context.flags)
+ && api_ws_write_string_length(&wb, buffer, size)) {
+ rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
+ if (rc >= 0)
+ return;
+ }
+ ERROR("error while sending raw");
+}
+
+static int api_ws_server_req_subscribe(struct api_ws_server_req *wreq, struct afb_event event)
+{
+ int rc, rc2;
+ struct writebuf wb = { .count = 0 };
+
+ rc = afb_evt_add_watch(wreq->client->listener, event);
+ if (rc < 0)
+ return rc;
+
+ if (api_ws_write_char(&wb, 'S')
+ && api_ws_write_uint32(&wb, wreq->msgid)
+ && api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
+ && api_ws_write_string(&wb, afb_evt_event_name(event))) {
+ rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
+ if (rc2 >= 0)
+ goto success;
+ }
+ ERROR("error while subscribing event");
+success:
+ return rc;
+}
+
+static int api_ws_server_req_unsubscribe(struct api_ws_server_req *wreq, struct afb_event event)
+{
+ int rc, rc2;
+ struct writebuf wb = { .count = 0 };
+
+ if (api_ws_write_char(&wb, 'U')
+ && api_ws_write_uint32(&wb, wreq->msgid)
+ && api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
+ && api_ws_write_string(&wb, afb_evt_event_name(event))) {
+ rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
+ if (rc2 >= 0)
+ goto success;
+ }
+ ERROR("error while subscribing event");
+success:
+ rc = afb_evt_remove_watch(wreq->client->listener, event);
+ return rc;
+}
+
+static void api_ws_server_req_subcall(struct api_ws_server_req *wreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
+{
+ afb_subcall(&wreq->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_api_ws_req_itf, .closure = wreq });
+}
+
+/******************* server part **********************************/
+
+static int api_ws_server_connect(struct api_ws *api);
+
+static int api_ws_server_listen_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
+{
+ if ((revents & EPOLLIN) != 0)
+ api_ws_server_accept(closure);
+ if ((revents & EPOLLHUP) != 0)
+ api_ws_server_connect(closure);
+ return 0;
+}
+
+static void api_ws_server_disconnect(struct api_ws *api)
+{
+ if (api->server.listensrc != NULL) {
+ sd_event_source_unref(api->server.listensrc);
+ api->server.listensrc = NULL;
+ }
+ if (api->fd >= 0) {
+ close(api->fd);
+ api->fd = -1;
+ }
+}
+
+static int api_ws_server_connect(struct api_ws *api)
+{
+ int rc;
+
+ /* ensure disconnected */
+ api_ws_server_disconnect(api);
+
+ /* request the service object name */
+ api->fd = api_ws_socket(api->path, 1);
+ if (api->fd < 0)
+ ERROR("can't create socket %s", api->path);
+ else {
+ /* listen for service */
+ rc = sd_event_add_io(afb_common_get_event_loop(), &api->server.listensrc, api->fd, EPOLLIN, api_ws_server_listen_callback, api);
+ if (rc >= 0)
+ return 0;
+ close(api->fd);
+ errno = -rc;
+ ERROR("can't add ws object %s", api->path);
+ }
+ return -1;
+}
+
+/* create the service */
+int afb_api_ws_add_server(const char *path)
+{
+ int rc;
+ struct api_ws *api;
+
+ /* creates the ws api object */
+ api = api_ws_make(path);
+ if (api == NULL)
+ goto error;
+
+ /* connect for serving */
+ rc = api_ws_server_connect(api);
+ if (rc < 0)
+ goto error2;
+
+ return 0;
+
+error2:
+ free(api);
+error:
+ return -1;
+}
+
+
Code Review / src / app-framework-binder.git / commitdiff