--- /dev/null
+/*
+ * Copyright (C) 2015, 2016, 2017 "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 <pthread.h>
+
+#include <json-c/json.h>
+#include <systemd/sd-event.h>
+
+#include "afb-common.h"
+
+#include "afb-ws.h"
+#include "afb-msg-json.h"
+#include "afb-proto-ws.h"
+#include "verbose.h"
+
+struct afb_proto_ws;
+
+/******** implementation of internal binder protocol per api **************/
+/*
+
+This protocol is asymetric: there is a client and a server
+
+The client can require the following actions:
+
+ - call a verb
+
+ - ask for description
+
+The server must reply to the previous actions by
+
+ - answering success or failure of the call
+
+ - answering the required description
+
+The server can also within the context of a call
+
+ - make a subcall
+
+ - subscribe or unsubscribe an event
+
+For the purpose of handling events the server can:
+
+ - create/destroy an event
+
+ - push or brodcast data as an event
+
+*/
+/************** 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'
+#define CHAR_FOR_DESCRIBE 'D'
+#define CHAR_FOR_DESCRIPTION 'd'
+
+/******************* 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 afb_proto_ws_subcall
+{
+ struct afb_proto_ws *protows; /**< proto descriptor */
+ void *buffer;
+ 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_proto_ws *protows; /* the proto_ws */
+ void *request;
+ uint32_t callid; /* the message identifier */
+};
+
+/*
+ * structure for a ws request
+ */
+struct afb_proto_ws_call {
+ struct client_call *next; /* the next call */
+ struct afb_proto_ws *protows; /* the client of the request */
+ uint32_t refcount; /* reference count */
+ uint32_t callid; /* the incoming request callid */
+ char *buffer; /* the incoming buffer */
+};
+
+/*
+ * structure for recording describe requests
+ */
+struct client_describe
+{
+ struct client_describe *next;
+ struct afb_proto_ws *protows;
+ void (*callback)(void*, struct json_object*);
+ void *closure;
+ uint32_t descid;
+};
+
+/*
+ * structure for jobs of describing
+ */
+struct afb_proto_ws_describe
+{
+ struct afb_proto_ws *protows;
+ uint32_t descid;
+};
+
+/******************* proto description for client or servers ******************/
+
+struct afb_proto_ws
+{
+ /* count of references */
+ int refcount;
+
+ /* file descriptor */
+ int fd;
+
+ /* resource control */
+ pthread_mutex_t mutex;
+
+ /* websocket */
+ struct afb_ws *ws;
+
+ /* the client closure */
+ void *closure;
+
+ /* the client side interface */
+ const struct afb_proto_ws_client_itf *client_itf;
+
+ /* the server side interface */
+ const struct afb_proto_ws_server_itf *server_itf;
+
+ /* emitted calls (client side) */
+ struct client_call *calls;
+
+ /* pending subcalls (server side) */
+ struct server_subcall *subcalls;
+
+ /* pending description (client side) */
+ struct client_describe *describes;
+
+ /* on hangup callback */
+ void (*on_hangup)(void *closure);
+};
+
+/******************* common useful tools **********************************/
+
+/**
+ * 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);
+}
+
+/******************* serialisation part **********************************/
+
+struct readbuf
+{
+ char *base, *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 *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;
+}
+
+static int readbuf_char(struct readbuf *rb, char *value)
+{
+ if (rb->head >= rb->end)
+ return 0;
+ *value = *rb->head++;
+ return 1;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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));
+}
+
+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);
+}
+
+/******************* ws request part for server *****************/
+
+void afb_proto_ws_call_addref(struct afb_proto_ws_call *call)
+{
+ __atomic_add_fetch(&call->refcount, 1, __ATOMIC_RELAXED);
+}
+
+void afb_proto_ws_call_unref(struct afb_proto_ws_call *call)
+{
+ if (__atomic_sub_fetch(&call->refcount, 1, __ATOMIC_RELAXED))
+ return;
+
+ afb_proto_ws_unref(call->protows);
+ free(call->buffer);
+ free(call);
+}
+
+int afb_proto_ws_call_success(struct afb_proto_ws_call *call, struct json_object *obj, const char *info)
+{
+ int rc = -1;
+ struct writebuf wb = { .count = 0 };
+
+ if (writebuf_char(&wb, CHAR_FOR_ANSWER_SUCCESS)
+ && writebuf_uint32(&wb, call->callid)
+ && writebuf_string(&wb, info ?: "")
+ && writebuf_object(&wb, obj)) {
+ rc = afb_ws_binary_v(call->protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto success;
+ }
+ }
+ ERROR("error while sending success");
+success:
+ return rc;
+}
+
+int afb_proto_ws_call_fail(struct afb_proto_ws_call *call, const char *status, const char *info)
+{
+ int rc = -1;
+ struct writebuf wb = { .count = 0 };
+
+ if (writebuf_char(&wb, CHAR_FOR_ANSWER_FAIL)
+ && writebuf_uint32(&wb, call->callid)
+ && writebuf_string(&wb, status)
+ && writebuf_string(&wb, info ? : "")) {
+ rc = afb_ws_binary_v(call->protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto success;
+ }
+ }
+ ERROR("error while sending fail");
+success:
+ return rc;
+}
+
+int afb_proto_ws_call_subcall(struct afb_proto_ws_call *call, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
+{
+ int rc = -1;
+ struct writebuf wb = { .count = 0 };
+ struct server_subcall *sc, *osc;
+ struct afb_proto_ws *protows = call->protows;
+
+ sc = malloc(sizeof *sc);
+ if (!sc)
+ errno = ENOMEM;
+ else {
+ sc->callback = callback;
+ sc->closure = cb_closure;
+
+ pthread_mutex_unlock(&protows->mutex);
+ sc->subcallid = ptr2id(sc);
+ do {
+ sc->subcallid++;
+ osc = protows->subcalls;
+ while(osc && osc->subcallid != sc->subcallid)
+ osc = osc->next;
+ } while (osc);
+ sc->next = protows->subcalls;
+ protows->subcalls = sc;
+ pthread_mutex_unlock(&protows->mutex);
+
+ if (writebuf_char(&wb, CHAR_FOR_SUBCALL_CALL)
+ && writebuf_uint32(&wb, sc->subcallid)
+ && writebuf_uint32(&wb, call->callid)
+ && writebuf_string(&wb, api)
+ && writebuf_string(&wb, verb)
+ && writebuf_object(&wb, args)) {
+ rc = afb_ws_binary_v(protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto success;
+ }
+ }
+ }
+ ERROR("error while sending subcall");
+success:
+ return rc;
+}
+
+int afb_proto_ws_call_subscribe(struct afb_proto_ws_call *call, const char *event_name, int event_id)
+{
+ int rc = -1;
+ struct writebuf wb = { .count = 0 };
+
+ if (writebuf_char(&wb, CHAR_FOR_EVT_SUBSCRIBE)
+ && writebuf_uint32(&wb, call->callid)
+ && writebuf_uint32(&wb, (uint32_t)event_id)
+ && writebuf_string(&wb, event_name)) {
+ rc = afb_ws_binary_v(call->protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto success;
+ }
+ }
+ ERROR("error while subscribing event");
+success:
+ return rc;
+}
+
+int afb_proto_ws_call_unsubscribe(struct afb_proto_ws_call *call, const char *event_name, int event_id)
+{
+ int rc = -1;
+ struct writebuf wb = { .count = 0 };
+
+ if (writebuf_char(&wb, CHAR_FOR_EVT_UNSUBSCRIBE)
+ && writebuf_uint32(&wb, call->callid)
+ && writebuf_uint32(&wb, (uint32_t)event_id)
+ && writebuf_string(&wb, event_name)) {
+ rc = afb_ws_binary_v(call->protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto success;
+ }
+ }
+ ERROR("error while subscribing event");
+success:
+ return rc;
+}
+
+/******************* client part **********************************/
+
+/* search a memorized call */
+static struct client_call *client_call_search(struct afb_proto_ws *protows, uint32_t callid)
+{
+ struct client_call *call;
+
+ call = protows->calls;
+ while (call != NULL && call->callid != callid)
+ call = call->next;
+
+ return call;
+}
+
+/* free and release the memorizing call */
+static void client_call_destroy(struct client_call *call)
+{
+ struct client_call **prv;
+
+ prv = &call->protows->calls;
+ while (*prv != NULL) {
+ if (*prv == call) {
+ *prv = call->next;
+ break;
+ }
+ prv = &(*prv)->next;
+ }
+ free(call);
+}
+
+/* get event data from the message */
+static int client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name)
+{
+ return readbuf_uint32(rb, eventid) && readbuf_string(rb, name, NULL);
+}
+
+/* get event from the message */
+static int client_msg_call_get(struct afb_proto_ws *protows, struct readbuf *rb, struct client_call **call)
+{
+ uint32_t callid;
+
+ /* get event data from the message */
+ if (!readbuf_uint32(rb, &callid)) {
+ ERROR("Invalid message");
+ return 0;
+ }
+
+ /* get the call */
+ *call = client_call_search(protows, callid);
+ if (*call == NULL) {
+ ERROR("message not found");
+ return 0;
+ }
+
+ return 1;
+}
+
+/* adds an event */
+static void client_on_event_create(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ uint32_t event_id;
+
+ if (protows->client_itf->on_event_create && client_msg_event_read(rb, &event_id, &event_name))
+ protows->client_itf->on_event_create(protows->closure, event_name, (int)event_id);
+}
+
+/* removes an event */
+static void client_on_event_remove(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ uint32_t event_id;
+
+ if (protows->client_itf->on_event_remove && client_msg_event_read(rb, &event_id, &event_name))
+ protows->client_itf->on_event_remove(protows->closure, event_name, (int)event_id);
+}
+
+/* subscribes an event */
+static void client_on_event_subscribe(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ uint32_t event_id;
+ struct client_call *call;
+
+ if (protows->client_itf->on_event_subscribe && client_msg_call_get(protows, rb, &call) && client_msg_event_read(rb, &event_id, &event_name))
+ protows->client_itf->on_event_subscribe(protows->closure, call->request, event_name, (int)event_id);
+}
+
+/* unsubscribes an event */
+static void client_on_event_unsubscribe(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ uint32_t event_id;
+ struct client_call *call;
+
+ if (protows->client_itf->on_event_unsubscribe && client_msg_call_get(protows, rb, &call) && client_msg_event_read(rb, &event_id, &event_name))
+ protows->client_itf->on_event_unsubscribe(protows->closure, call->request, event_name, (int)event_id);
+}
+
+/* receives broadcasted events */
+static void client_on_event_broadcast(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ struct json_object *object;
+
+ if (protows->client_itf->on_event_broadcast && readbuf_string(rb, &event_name, NULL) && readbuf_object(rb, &object))
+ protows->client_itf->on_event_broadcast(protows->closure, event_name, object);
+}
+
+/* pushs an event */
+static void client_on_event_push(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ const char *event_name;
+ uint32_t event_id;
+ struct json_object *object;
+
+ if (protows->client_itf->on_event_push && client_msg_event_read(rb, &event_id, &event_name) && readbuf_object(rb, &object))
+ protows->client_itf->on_event_push(protows->closure, event_name, (int)event_id, object);
+}
+
+static void client_on_reply_success(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ struct client_call *call;
+ struct json_object *object;
+ const char *info;
+
+ if (!client_msg_call_get(protows, rb, &call))
+ return;
+
+ if (readbuf_string(rb, &info, NULL) && readbuf_object(rb, &object)) {
+ protows->client_itf->on_reply_success(protows->closure, call->request, object, info);
+ } else {
+ protows->client_itf->on_reply_fail(protows->closure, call->request, "proto-error", "can't process success");
+ }
+ client_call_destroy(call);
+}
+
+static void client_on_reply_fail(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ struct client_call *call;
+ const char *info, *status;
+
+ if (!client_msg_call_get(protows, rb, &call))
+ return;
+
+ if (readbuf_string(rb, &status, NULL) && readbuf_string(rb, &info, NULL)) {
+ protows->client_itf->on_reply_fail(protows->closure, call->request, status, info);
+ } else {
+ protows->client_itf->on_reply_fail(protows->closure, call->request, "proto-error", "can't process fail");
+ }
+ client_call_destroy(call);
+}
+
+/* send a subcall reply */
+static int client_send_subcall_reply(struct afb_proto_ws *protows, uint32_t subcallid, int status, json_object *object)
+{
+ struct writebuf wb = { .count = 0 };
+ char ie = status < 0;
+
+ return -!(writebuf_char(&wb, CHAR_FOR_SUBCALL_REPLY)
+ && writebuf_uint32(&wb, subcallid)
+ && writebuf_char(&wb, ie)
+ && writebuf_object(&wb, object)
+ && afb_ws_binary_v(protows->ws, wb.iovec, wb.count) >= 0);
+}
+
+/* callback for subcall reply */
+int afb_proto_ws_subcall_reply(struct afb_proto_ws_subcall *subcall, int status, struct json_object *result)
+{
+ int rc = client_send_subcall_reply(subcall->protows, subcall->subcallid, status, result);
+ afb_proto_ws_unref(subcall->protows);
+ free(subcall->buffer);
+ free(subcall);
+ return rc;
+}
+
+/* received a subcall request */
+static void client_on_subcall(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ struct afb_proto_ws_subcall *subcall;
+ struct client_call *call;
+ const char *api, *verb;
+ uint32_t subcallid;
+ struct json_object *object;
+
+ /* get the subcallid */
+ if (!readbuf_uint32(rb, &subcallid))
+ return;
+
+ /* if not expected drop it */
+ if (!protows->client_itf->on_subcall)
+ goto error;
+
+ /* retrieve the message data */
+ if (!client_msg_call_get(protows, rb, &call))
+ goto error;
+
+ /* allocation of the subcall */
+ subcall = malloc(sizeof *subcall);
+ if (!subcall)
+ goto error;
+
+ /* make the call */
+ if (readbuf_string(rb, &api, NULL)
+ && readbuf_string(rb, &verb, NULL)
+ && readbuf_object(rb, &object)) {
+ afb_proto_ws_addref(protows);
+ subcall->protows = protows;
+ subcall->subcallid = subcallid;
+ subcall->buffer = rb->base;
+ rb->base = NULL;
+ protows->client_itf->on_subcall(protows->closure, subcall, call->request, api, verb, object);
+ return;
+ }
+ free(subcall);
+error:
+ client_send_subcall_reply(protows, subcallid, 1, NULL);
+}
+
+static void client_on_description(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ uint32_t descid;
+ struct client_describe *desc, **prv;
+ struct json_object *object;
+
+ if (readbuf_uint32(rb, &descid)) {
+ prv = &protows->describes;
+ while ((desc = *prv) && desc->descid != descid)
+ prv = &desc->next;
+ if (desc) {
+ *prv = desc->next;
+ if (!readbuf_object(rb, &object))
+ object = NULL;
+ desc->callback(desc->closure, object);
+ free(desc);
+ }
+ }
+}
+
+/* callback when receiving binary data */
+static void client_on_binary(void *closure, char *data, size_t size)
+{
+ struct afb_proto_ws *protows;
+ struct readbuf rb;
+
+ rb.base = data;
+ if (size > 0) {
+ rb.head = data;
+ rb.end = data + size;
+ protows = closure;
+
+ pthread_mutex_lock(&protows->mutex);
+ switch (*rb.head++) {
+ case CHAR_FOR_ANSWER_SUCCESS: /* success */
+ client_on_reply_success(protows, &rb);
+ break;
+ case CHAR_FOR_ANSWER_FAIL: /* fail */
+ client_on_reply_fail(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_BROADCAST: /* broadcast */
+ client_on_event_broadcast(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_ADD: /* creates the event */
+ client_on_event_create(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_DEL: /* removes the event */
+ client_on_event_remove(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_PUSH: /* pushs the event */
+ client_on_event_push(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_SUBSCRIBE: /* subscribe event for a request */
+ client_on_event_subscribe(protows, &rb);
+ break;
+ case CHAR_FOR_EVT_UNSUBSCRIBE: /* unsubscribe event for a request */
+ client_on_event_unsubscribe(protows, &rb);
+ break;
+ case CHAR_FOR_SUBCALL_CALL: /* subcall */
+ client_on_subcall(protows, &rb);
+ break;
+ case CHAR_FOR_DESCRIPTION: /* description */
+ client_on_description(protows, &rb);
+ break;
+ default: /* unexpected message */
+ /* TODO: close the connection */
+ break;
+ }
+ pthread_mutex_unlock(&protows->mutex);
+ }
+ free(rb.base);
+}
+
+int afb_proto_ws_client_call(
+ struct afb_proto_ws *protows,
+ const char *verb,
+ struct json_object *args,
+ const char *sessionid,
+ void *request
+)
+{
+ int rc = -1;
+ struct client_call *call;
+ struct writebuf wb = { .count = 0 };
+
+ /* allocate call data */
+ call = malloc(sizeof *call);
+ if (call == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+ call->request = request;
+
+ /* init call data */
+ pthread_mutex_lock(&protows->mutex);
+ call->callid = ptr2id(call);
+ while(client_call_search(protows, call->callid) != NULL)
+ call->callid++;
+ call->protows = protows;
+ call->next = protows->calls;
+ protows->calls = call;
+
+ /* creates the call message */
+ if (!writebuf_char(&wb, CHAR_FOR_CALL)
+ || !writebuf_uint32(&wb, call->callid)
+ || !writebuf_string(&wb, verb)
+ || !writebuf_string(&wb, sessionid)
+ || !writebuf_object(&wb, args)) {
+ errno = EINVAL;
+ goto clean;
+ }
+
+ /* send */
+ rc = afb_ws_binary_v(protows->ws, wb.iovec, wb.count);
+ if (rc >= 0) {
+ rc = 0;
+ goto end;
+ }
+
+clean:
+ client_call_destroy(call);
+end:
+ pthread_mutex_unlock(&protows->mutex);
+ return rc;
+}
+
+/* get the description */
+int afb_proto_ws_client_describe(struct afb_proto_ws *protows, void (*callback)(void*, struct json_object*), void *closure)
+{
+ struct client_describe *desc, *d;
+ struct writebuf wb = { .count = 0 };
+
+ desc = malloc(sizeof *desc);
+ if (!desc) {
+ errno = ENOMEM;
+ goto error;
+ }
+
+ /* fill in stack the description of the task */
+ pthread_mutex_lock(&protows->mutex);
+ desc->descid = ptr2id(desc);
+ d = protows->describes;
+ while (d) {
+ if (d->descid != desc->descid)
+ d = d->next;
+ else {
+ desc->descid++;
+ d = protows->describes;
+ }
+ }
+ desc->callback = callback;
+ desc->closure = closure;
+ desc->protows = protows;
+ desc->next = protows->describes;
+ protows->describes = desc;
+ pthread_mutex_unlock(&protows->mutex);
+
+ /* send */
+ if (writebuf_char(&wb, CHAR_FOR_DESCRIBE)
+ && writebuf_uint32(&wb, desc->descid)
+ && afb_ws_binary_v(protows->ws, wb.iovec, wb.count) >= 0)
+ return 0;
+
+ pthread_mutex_lock(&protows->mutex);
+ d = protows->describes;
+ if (d == desc)
+ protows->describes = desc->next;
+ else {
+ while(d && d->next != desc)
+ d = d->next;
+ if (d)
+ d->next = desc->next;
+ }
+ free(desc);
+ pthread_mutex_unlock(&protows->mutex);
+error:
+ /* TODO? callback(closure, NULL); */
+ return -1;
+}
+
+/******************* client description part for server *****************************/
+
+/* on call, propagate it to the ws service */
+static void server_on_call(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ struct afb_proto_ws_call *call;
+ const char *uuid, *verb;
+ uint32_t callid;
+ size_t lenverb;
+ struct json_object *object;
+
+ afb_proto_ws_addref(protows);
+
+ /* reads the call message data */
+ if (!readbuf_uint32(rb, &callid)
+ || !readbuf_string(rb, &verb, &lenverb)
+ || !readbuf_string(rb, &uuid, NULL)
+ || !readbuf_object(rb, &object))
+ goto overflow;
+
+ /* create the request */
+ call = malloc(sizeof *call);
+ if (call == NULL)
+ goto out_of_memory;
+
+ call->protows = protows;
+ call->callid = callid;
+ call->refcount = 1;
+ call->buffer = rb->base;
+ rb->base = NULL; /* don't free the buffer */
+
+ protows->server_itf->on_call(protows->closure, call, verb, object, uuid);
+ return;
+
+out_of_memory:
+ json_object_put(object);
+
+overflow:
+ afb_proto_ws_unref(protows);
+}
+
+/* on subcall reply */
+static void server_on_subcall_reply(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ char ie;
+ 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, &ie)
+ || !readbuf_object(rb, &object)) {
+ /* TODO bad protocol */
+ return;
+ }
+
+ /* search the subcall and unlink it */
+ pthread_mutex_lock(&protows->mutex);
+ psc = &protows->subcalls;
+ while ((sc = *psc) && sc->subcallid != subcallid)
+ psc = &sc->next;
+ if (!sc) {
+ pthread_mutex_unlock(&protows->mutex);
+ json_object_put(object);
+ /* TODO subcall not found */
+ } else {
+ *psc = sc->next;
+ pthread_mutex_unlock(&protows->mutex);
+ sc->callback(sc->closure, -(int)ie, object);
+ free(sc);
+ }
+}
+
+static int server_send_description(struct afb_proto_ws *protows, uint32_t descid, struct json_object *descobj)
+{
+ struct writebuf wb = { .count = 0 };
+
+ return -!(writebuf_char(&wb, CHAR_FOR_DESCRIPTION)
+ && writebuf_uint32(&wb, descid)
+ && writebuf_object(&wb, descobj)
+ && afb_ws_binary_v(protows->ws, wb.iovec, wb.count) >= 0);
+}
+
+int afb_proto_ws_describe_put(struct afb_proto_ws_describe *describe, struct json_object *description)
+{
+ int rc = server_send_description(describe->protows, describe->descid, description);
+ afb_proto_ws_addref(describe->protows);
+ free(describe);
+ return rc;
+}
+
+/* on describe, propagate it to the ws service */
+static void server_on_describe(struct afb_proto_ws *protows, struct readbuf *rb)
+{
+ uint32_t descid;
+ struct afb_proto_ws_describe *desc;
+
+ /* reads the descid */
+ if (readbuf_uint32(rb, &descid)) {
+ if (protows->server_itf->on_describe) {
+ /* create asynchronous job */
+ desc = malloc(sizeof *desc);
+ if (desc) {
+ desc->descid = descid;
+ desc->protows = protows;
+ afb_proto_ws_addref(protows);
+ protows->server_itf->on_describe(protows->closure, desc);
+ return;
+ }
+ }
+ server_send_description(protows, descid, NULL);
+ }
+}
+
+/* callback when receiving binary data */
+static void server_on_binary(void *closure, char *data, size_t size)
+{
+ struct afb_proto_ws *protows;
+ struct readbuf rb;
+
+ rb.base = data;
+ if (size > 0) {
+ rb.head = data;
+ rb.end = data + size;
+ protows = closure;
+
+ switch (*rb.head++) {
+ case CHAR_FOR_CALL:
+ server_on_call(protows, &rb);
+ break;
+ case CHAR_FOR_SUBCALL_REPLY:
+ server_on_subcall_reply(protows, &rb);
+ break;
+ case CHAR_FOR_DESCRIBE:
+ server_on_describe(protows, &rb);
+ break;
+ default: /* unexpected message */
+ /* TODO: close the connection */
+ break;
+ }
+ }
+ free(rb.base);
+}
+
+/******************* server part: manage events **********************************/
+
+static int server_event_send(struct afb_proto_ws *protows, char order, const char *event_name, int event_id, struct json_object *data)
+{
+ struct writebuf wb = { .count = 0 };
+
+ return -!(writebuf_char(&wb, order)
+ && (order == CHAR_FOR_EVT_BROADCAST || writebuf_uint32(&wb, event_id))
+ && writebuf_string(&wb, event_name)
+ && (order == CHAR_FOR_EVT_ADD || order == CHAR_FOR_EVT_DEL || writebuf_object(&wb, data))
+ && afb_ws_binary_v(protows->ws, wb.iovec, wb.count) >= 0);
+}
+
+int afb_proto_ws_server_event_create(struct afb_proto_ws *protows, const char *event_name, int event_id)
+{
+ return server_event_send(protows, CHAR_FOR_EVT_ADD, event_name, event_id, NULL);
+}
+
+int afb_proto_ws_server_event_remove(struct afb_proto_ws *protows, const char *event_name, int event_id)
+{
+ return server_event_send(protows, CHAR_FOR_EVT_DEL, event_name, event_id, NULL);
+}
+
+int afb_proto_ws_server_event_push(struct afb_proto_ws *protows, const char *event_name, int event_id, struct json_object *data)
+{
+ return server_event_send(protows, CHAR_FOR_EVT_PUSH, event_name, event_id, data);
+}
+
+int afb_proto_ws_server_event_broadcast(struct afb_proto_ws *protows, const char *event_name, struct json_object *data)
+{
+ return server_event_send(protows, CHAR_FOR_EVT_BROADCAST, event_name, 0, data);
+}
+
+/*****************************************************/
+
+/* callback when receiving a hangup */
+static void on_hangup(void *closure)
+{
+ struct afb_proto_ws *protows = closure;
+ struct server_subcall *sc, *nsc;
+ struct client_describe *cd, *ncd;
+
+ nsc = protows->subcalls;
+ while (nsc) {
+ sc= nsc;
+ nsc = sc->next;
+ sc->callback(sc->closure, 1, NULL);
+ free(sc);
+ }
+
+ ncd = protows->describes;
+ while (ncd) {
+ cd= ncd;
+ ncd = cd->next;
+ cd->callback(cd->closure, NULL);
+ free(cd);
+ }
+
+ if (protows->fd >= 0) {
+ protows->fd = -1;
+ if (protows->on_hangup)
+ protows->on_hangup(protows->closure);
+ }
+}
+
+/*****************************************************/
+
+static const struct afb_ws_itf proto_ws_client_ws_itf =
+{
+ .on_close = NULL,
+ .on_text = NULL,
+ .on_binary = client_on_binary,
+ .on_error = NULL,
+ .on_hangup = on_hangup
+};
+
+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 = on_hangup
+};
+
+/*****************************************************/
+
+static struct afb_proto_ws *afb_proto_ws_create(int fd, const struct afb_proto_ws_server_itf *itfs, const struct afb_proto_ws_client_itf *itfc, void *closure, const struct afb_ws_itf *itf)
+{
+ struct afb_proto_ws *protows;
+
+ protows = calloc(1, sizeof *protows);
+ if (protows == NULL)
+ errno = ENOMEM;
+ else {
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+ protows->ws = afb_ws_create(afb_common_get_event_loop(), fd, itf, protows);
+ if (protows->ws != NULL) {
+ protows->fd = fd;
+ protows->refcount = 1;
+ protows->subcalls = NULL;
+ protows->closure = closure;
+ protows->server_itf = itfs;
+ protows->client_itf = itfc;
+ pthread_mutex_init(&protows->mutex, NULL);
+ return protows;
+ }
+ free(protows);
+ }
+ return NULL;
+}
+
+struct afb_proto_ws *afb_proto_ws_create_client(int fd, const struct afb_proto_ws_client_itf *itf, void *closure)
+{
+ return afb_proto_ws_create(fd, NULL, itf, closure, &proto_ws_client_ws_itf);
+}
+
+struct afb_proto_ws *afb_proto_ws_create_server(int fd, const struct afb_proto_ws_server_itf *itf, void *closure)
+{
+ return afb_proto_ws_create(fd, itf, NULL, closure, &server_ws_itf);
+}
+
+void afb_proto_ws_unref(struct afb_proto_ws *protows)
+{
+ if (!__atomic_sub_fetch(&protows->refcount, 1, __ATOMIC_RELAXED)) {
+ afb_proto_ws_hangup(protows);
+ afb_ws_destroy(protows->ws);
+ pthread_mutex_destroy(&protows->mutex);
+ free(protows);
+ }
+}
+
+void afb_proto_ws_addref(struct afb_proto_ws *protows)
+{
+ __atomic_add_fetch(&protows->refcount, 1, __ATOMIC_RELAXED);
+}
+
+int afb_proto_ws_is_client(struct afb_proto_ws *protows)
+{
+ return !!protows->client_itf;
+}
+
+int afb_proto_ws_is_server(struct afb_proto_ws *protows)
+{
+ return !!protows->server_itf;
+}
+
+void afb_proto_ws_hangup(struct afb_proto_ws *protows)
+{
+ afb_ws_hangup(protows->ws);
+}
+
+void afb_proto_ws_on_hangup(struct afb_proto_ws *protows, void (*on_hangup)(void *closure))
+{
+ protows->on_hangup = on_hangup;
+}
+
Code Review / src / app-framework-binder.git / blobdiff