#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/afb-req-itf.h>
-
-#include "afb-common.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-api-so.h"
-#include "afb-context.h"
-#include "afb-evt.h"
-#include "afb-xreq.h"
+#include "afb-common.h"
+#include "afb-stub-ws.h"
#include "verbose.h"
#include "sd-fds.h"
-struct api_ws_memo;
-struct api_ws_event;
-struct api_ws_client;
-
-#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'
-
-/*
- */
struct api_ws
{
char *path; /* path of the object for the API */
char *api; /* api name of the interface */
int fd; /* file descriptor */
- pthread_mutex_t mutex; /**< resource control */
- union {
- struct {
- struct afb_ws *ws;
- struct api_ws_event *events;
- struct api_ws_memo *memos;
- } client;
- struct {
- sd_event_source *listensrc; /**< systemd source for server socket */
- struct afb_apiset *apiset;
- } server;
- };
-};
-
-#define RETOK 1
-#define RETERR 2
-#define RETRAW 3
-
-/******************* common usefull 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);
-}
-
-/******************* 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
-};
-
-/******************* handling subcalls *****************************/
-
-/**
- * Structure on server side for recording pending
- * subcalls.
- */
-struct api_ws_subcall
-{
- struct api_ws_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 api_ws_reply
-{
- struct api_ws *apiws; /**< api descriptor */
- uint32_t subcallid; /**< subcallid for the reply */
-};
-
-/******************* client description part for server *****************************/
-
-struct api_ws_client
-{
- /* the server ws-api */
- const char *api;
-
- /* count of references */
- int refcount;
-
- /* file descriptor */
- int fd;
-
- /* resource control */
- pthread_mutex_t mutex;
-
- /* listener for events */
- struct afb_evt_listener *listener;
-
- /* websocket */
- struct afb_ws *ws;
-
- /* credentials */
- struct afb_cred *cred;
-
- /* pending subcalls */
- struct api_ws_subcall *subcalls;
-
- /* apiset */
+ sd_event_source *listensrc; /**< systemd source for server socket */
struct afb_apiset *apiset;
};
-/******************* 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_xreq xreq; /* the xreq */
- struct api_ws_client *client; /* the client of the request */
- uint32_t msgid; /* the incoming request msgid */
-};
-
-static void api_ws_server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info);
-static void api_ws_server_req_fail_cb(struct afb_xreq *xreq, const char *status, const char *info);
-static void api_ws_server_req_destroy_cb(struct afb_xreq *xreq);
-static int api_ws_server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event);
-static int api_ws_server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event);
-static void api_ws_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);
-
-const struct afb_xreq_query_itf afb_api_ws_xreq_itf = {
- .success = api_ws_server_req_success_cb,
- .fail = api_ws_server_req_fail_cb,
- .unref = api_ws_server_req_destroy_cb,
- .subcall = api_ws_server_req_subcall_cb,
- .subscribe = api_ws_server_req_subscribe_cb,
- .unsubscribe = api_ws_server_req_unsubscribe_cb
-};
-
-/******************* common part **********************************/
+/******************************************************************************/
/*
* create a structure api_ws not connected to the 'path'.
errno = EINVAL;
goto error2;
}
- pthread_mutex_init(&api->mutex, NULL);
api->fd = -1;
return api;
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_char(struct readbuf *rb, char *value)
-{
- if (rb->head >= rb->end)
- return 0;
- *value = *rb->head++;
- return 1;
-}
-
-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)
-{
- const char *string;
- struct json_object *o;
- int rc = api_ws_read_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 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_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_xreq *xreq; /* the request handle */
- 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_xreq *xreq)
-{
- struct api_ws_memo *memo;
-
- memo = malloc(sizeof *memo);
- if (memo != NULL) {
- afb_xreq_addref(xreq);
- memo->xreq = xreq;
- memo->msgid = ptr2id(memo);
- while(api_ws_client_memo_search(api, memo->msgid) != NULL)
- memo->msgid++;
- 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_xreq_unref(memo->xreq);
- 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_memo **memo, struct api_ws_event **ev)
-{
- 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, &memo, &ev)) {
- /* subscribe the request from the event */
- if (afb_xreq_subscribe(memo->xreq, 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, &memo, &ev)) {
- /* unsubscribe the request from the event */
- if (afb_xreq_unsubscribe(memo->xreq, 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->xreq->context.flags = (unsigned)flags;
- afb_xreq_success(memo->xreq, object, *info ? info : NULL);
- } else {
- /* failing to have the answer */
- afb_xreq_fail(memo->xreq, "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->xreq->context.flags = (unsigned)flags;
- afb_xreq_fail(memo->xreq, status, *info ? info : NULL);
- } else {
- /* failing to have the answer */
- afb_xreq_fail(memo->xreq, "error", "ws error");
- }
- api_ws_client_memo_destroy(memo);
-}
-
-/* send a subcall reply */
-static void api_ws_client_send_subcall_reply(struct api_ws_reply *reply, int iserror, json_object *object)
-{
- int rc;
- struct writebuf wb = { .count = 0 };
- char ie = (char)!!iserror;
-
- if (!api_ws_write_char(&wb, CHAR_FOR_SUBCALL_REPLY)
- || !api_ws_write_uint32(&wb, reply->subcallid)
- || !api_ws_write_char(&wb, ie)
- || !api_ws_write_object(&wb, object)) {
- /* write error ? */
- return;
- }
-
- rc = afb_ws_binary_v(reply->apiws->client.ws, wb.iovec, wb.count);
- if (rc >= 0)
- return;
- ERROR("error while sending subcall reply");
-}
-
-/* callback for subcall reply */
-static void api_ws_client_subcall_reply_cb(void *closure, int iserror, json_object *object)
-{
- api_ws_client_send_subcall_reply(closure, iserror, object);
- free(closure);
-}
-
-/* received a subcall request */
-static void api_ws_client_subcall(struct api_ws *apiws, struct readbuf *rb)
-{
- struct api_ws_reply *reply;
- struct api_ws_memo *memo;
- const char *api, *verb;
- uint32_t subcallid;
- struct json_object *object;
-
- reply = malloc(sizeof *reply);
- if (!reply)
- return;
-
- /* retrieve the message data */
- if (!api_ws_client_msg_memo_get(apiws, rb, &memo))
- return;
-
- if (api_ws_read_uint32(rb, &subcallid)
- && api_ws_read_string(rb, &api, NULL)
- && api_ws_read_string(rb, &verb, NULL)
- && api_ws_read_object(rb, &object)) {
- reply->apiws = apiws;
- reply->subcallid = subcallid;
- afb_xreq_subcall(memo->xreq, api, verb, object, api_ws_client_subcall_reply_cb, reply);
- }
-}
-
-/* callback when receiving binary data */
-static void api_ws_client_on_binary(void *closure, char *data, size_t size)
-{
- if (size > 0) {
- struct api_ws *apiws = closure;
- struct readbuf rb = { .head = data, .end = data + size };
-
- pthread_mutex_lock(&apiws->mutex);
- switch (*rb.head++) {
- case CHAR_FOR_ANSWER_SUCCESS: /* success */
- api_ws_client_reply_success(apiws, &rb);
- break;
- case CHAR_FOR_ANSWER_FAIL: /* fail */
- api_ws_client_reply_fail(apiws, &rb);
- break;
- case CHAR_FOR_EVT_BROADCAST: /* broadcast */
- api_ws_client_event_broadcast(apiws, &rb);
- break;
- case CHAR_FOR_EVT_ADD: /* creates the event */
- api_ws_client_event_create(apiws, &rb);
- break;
- case CHAR_FOR_EVT_DEL: /* drops the event */
- api_ws_client_event_drop(apiws, &rb);
- break;
- case CHAR_FOR_EVT_PUSH: /* pushs the event */
- api_ws_client_event_push(apiws, &rb);
- break;
- case CHAR_FOR_EVT_SUBSCRIBE: /* subscribe event for a request */
- api_ws_client_event_subscribe(apiws, &rb);
- break;
- case CHAR_FOR_EVT_UNSUBSCRIBE: /* unsubscribe event for a request */
- api_ws_client_event_unsubscribe(apiws, &rb);
- break;
- case CHAR_FOR_SUBCALL_CALL: /* subcall */
- api_ws_client_subcall(apiws, &rb);
- break;
- default: /* unexpected message */
- /* TODO: close the connection */
- break;
- }
- pthread_mutex_unlock(&apiws->mutex);
- }
- free(data);
-}
-
-/* on call, propagate it to the ws service */
-static void api_ws_client_call_cb(void * closure, struct afb_xreq *xreq)
-{
- int rc;
- struct api_ws_memo *memo;
- struct writebuf wb = { .count = 0 };
- const char *raw;
- size_t szraw;
- struct api_ws *apiws = closure;
-
- pthread_mutex_lock(&apiws->mutex);
-
- /* create the recording data */
- memo = api_ws_client_memo_make(apiws, xreq);
- if (memo == 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 (!api_ws_write_char(&wb, CHAR_FOR_CALL)
- || !api_ws_write_uint32(&wb, memo->msgid)
- || !api_ws_write_uint32(&wb, (uint32_t)xreq->context.flags)
- || !api_ws_write_string(&wb, xreq->verb)
- || !api_ws_write_string(&wb, afb_session_uuid(xreq->context.session))
- || !api_ws_write_string_length(&wb, raw, szraw))
- goto overflow;
-
- /* send */
- rc = afb_ws_binary_v(apiws->client.ws, wb.iovec, wb.count);
- if (rc >= 0)
- goto end;
+/**********************************************************************************/
- afb_xreq_fail(xreq, "error", "websocket sending error");
- goto clean_memo;
-
-internal_error:
- afb_xreq_fail(xreq, "error", "internal: raw is NULL!");
- goto clean_memo;
-
-overflow:
- afb_xreq_fail(xreq, "error", "overflow: size doesn't match 32 bits!");
-
-clean_memo:
- api_ws_client_memo_destroy(memo);
-end:
- pthread_mutex_unlock(&apiws->mutex);
-}
-
-/* */
-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;
-}
-
-static struct afb_api_itf ws_api_itf = {
- .call = api_ws_client_call_cb
-};
-
-/* adds a afb-ws-service client api */
int afb_api_ws_add_client(const char *path, struct afb_apiset *apiset)
{
- int rc;
- struct api_ws *api;
- struct afb_api afb_api;
+ struct api_ws *apiws;
+ struct afb_stub_ws *stubws;
/* create the ws client api */
- api = api_ws_make(path);
- if (api == NULL)
+ apiws = api_ws_make(path);
+ if (apiws == 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);
+ apiws->fd = api_ws_socket(apiws->path, 0);
+ if (apiws->fd < 0) {
+ ERROR("can't connect to ws service %s", apiws->path);
goto error2;
}
- /* record it as an API */
- afb_api.closure = api;
- afb_api.itf = &ws_api_itf;
- if (afb_apiset_add(apiset, api->api, afb_api) < 0)
+ stubws = afb_stub_ws_create_client(apiws->fd, apiws->api, apiset);
+ if (!stubws) {
+ ERROR("can't setup client ws service to %s", apiws->path);
goto error3;
-
+ }
+ free(apiws);
return 0;
error3:
- api_ws_client_disconnect(api);
+ close(apiws->fd);
error2:
- free(api);
+ free(apiws);
error:
return -1;
}
-/******************* client description part for server *****************************/
-
-static void api_ws_server_client_unref(struct api_ws_client *client)
-{
- struct api_ws_subcall *sc, *nsc;
-
- if (!__atomic_sub_fetch(&client->refcount, 1, __ATOMIC_RELAXED)) {
- afb_evt_listener_unref(client->listener);
- afb_ws_destroy(client->ws);
- nsc = client->subcalls;
- while (nsc) {
- sc= nsc;
- nsc = sc->next;
- sc->callback(sc->closure, 1, NULL);
- free(sc);
- }
- afb_cred_unref(client->cred);
- afb_apiset_unref(client->apiset);
- free(client);
- }
-}
-
-static void api_ws_server_client_addref(struct api_ws_client *client)
-{
- __atomic_add_fetch(&client->refcount, 1, __ATOMIC_RELAXED);
-}
-
-/* on call, propagate it to the ws service */
-static void api_ws_server_on_call(struct api_ws_client *client, struct readbuf *rb)
-{
- struct api_ws_server_req *wreq;
- char *cverb;
- const char *uuid, *verb;
- uint32_t flags, msgid;
- size_t lenverb;
- struct json_object *object;
-
- api_ws_server_client_addref(client);
-
- /* reads the call message data */
- if (!api_ws_read_uint32(rb, &msgid)
- || !api_ws_read_uint32(rb, &flags)
- || !api_ws_read_string(rb, &verb, &lenverb)
- || !api_ws_read_string(rb, &uuid, NULL)
- || !api_ws_read_object(rb, &object))
- goto overflow;
-
- /* create the request */
- wreq = malloc(++lenverb + sizeof *wreq);
- if (wreq == NULL)
- goto out_of_memory;
-
- afb_xreq_init(&wreq->xreq, &afb_api_ws_xreq_itf);
- wreq->client = client;
- wreq->msgid = msgid;
- cverb = (char*)&wreq[1];
- memcpy(cverb, verb, lenverb);
-
- /* init the context */
- if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0)
- goto unconnected;
- wreq->xreq.context.flags = flags;
-
- /* makes the call */
- wreq->xreq.cred = afb_cred_addref(client->cred);
- wreq->xreq.api = client->api;
- wreq->xreq.verb = cverb;
- wreq->xreq.json = object;
- afb_xreq_process(&wreq->xreq, client->apiset);
- return;
-
-unconnected:
- free(wreq);
-out_of_memory:
- json_object_put(object);
-overflow:
- api_ws_server_client_unref(client);
-}
-
-/* on subcall reply */
-static void api_ws_server_on_subcall_reply(struct api_ws_client *client, struct readbuf *rb)
-{
- char iserror;
- uint32_t subcallid;
- struct json_object *object;
- struct api_ws_subcall *sc, **psc;
-
- /* reads the call message data */
- if (!api_ws_read_uint32(rb, &subcallid)
- || !api_ws_read_char(rb, &iserror)
- || !api_ws_read_object(rb, &object)) {
- /* TODO bad protocol */
- return;
- }
-
- /* search the subcall and unlink it */
- pthread_mutex_lock(&client->mutex);
- psc = &client->subcalls;
- while ((sc = *psc) && sc->subcallid != subcallid)
- psc = &sc->next;
- if (!sc) {
- pthread_mutex_unlock(&client->mutex);
- /* TODO subcall not found */
- } else {
- *psc = sc->next;
- pthread_mutex_unlock(&client->mutex);
- sc->callback(sc->closure, (int)iserror, object);
- free(sc);
- }
- json_object_put(object);
-}
-
-/* callback when receiving binary data */
-static void api_ws_server_on_binary(void *closure, char *data, size_t size)
-{
- if (size > 0) {
- struct readbuf rb = { .head = data, .end = data + size };
- switch (*rb.head++) {
- case CHAR_FOR_CALL:
- api_ws_server_on_call(closure, &rb);
- break;
- case CHAR_FOR_SUBCALL_REPLY:
- api_ws_server_on_subcall_reply(closure, &rb);
- break;
- default: /* unexpected message */
- /* TODO: close the connection */
- break;
- }
- }
- free(data);
-}
-
-/* callback when receiving a hangup */
-static void api_ws_server_on_hangup(void *closure)
+static int api_ws_server_accept_client(struct api_ws *apiws, int fd)
{
- 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);
+ return -!afb_stub_ws_create_server(fd, apiws->api, apiws->apiset);
}
-static void api_ws_server_accept(struct api_ws *api)
+static void api_ws_server_accept(struct api_ws *apiws)
{
- struct api_ws_client *client;
+ int rc, fd;
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->cred = afb_cred_create_for_socket(client->fd);
- fcntl(client->fd, F_SETFD, FD_CLOEXEC);
- fcntl(client->fd, F_SETFL, O_NONBLOCK);
- 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->apiset = afb_apiset_addref(api->server.apiset);
- client->refcount = 1;
- client->subcalls = NULL;
- return;
- }
- afb_cred_unref(client->cred);
- 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, CHAR_FOR_EVT_ADD, event, eventid, NULL);
-}
-
-static void api_ws_server_event_remove(void *closure, const char *event, int eventid)
-{
- api_ws_server_event_send(closure, CHAR_FOR_EVT_DEL, 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, CHAR_FOR_EVT_PUSH, 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, CHAR_FOR_EVT_BROADCAST) && 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 *****************/
-
-/* decrement the reference count of the request and free/release it on falling to null */
-static void api_ws_server_req_destroy_cb(struct afb_xreq *xreq)
-{
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
-
- afb_context_disconnect(&wreq->xreq.context);
- afb_cred_unref(wreq->xreq.cred);
- json_object_put(wreq->xreq.json);
- api_ws_server_client_unref(wreq->client);
- free(wreq);
-}
-
-static void api_ws_server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info)
-{
- int rc;
- struct writebuf wb = { .count = 0 };
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
-
- if (api_ws_write_char(&wb, CHAR_FOR_ANSWER_SUCCESS)
- && api_ws_write_uint32(&wb, wreq->msgid)
- && api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.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_cb(struct afb_xreq *xreq, const char *status, const char *info)
-{
- int rc;
- struct writebuf wb = { .count = 0 };
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
-
- if (api_ws_write_char(&wb, CHAR_FOR_ANSWER_FAIL)
- && api_ws_write_uint32(&wb, wreq->msgid)
- && api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.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);
+ lenaddr = (socklen_t)sizeof addr;
+ fd = accept(apiws->fd, &addr, &lenaddr);
+ if (fd >= 0) {
+ rc = api_ws_server_accept_client(apiws, fd);
if (rc >= 0)
return;
+ close(fd);
}
- ERROR("error while sending fail");
-}
-
-static void api_ws_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)
-{
- int rc;
- struct writebuf wb = { .count = 0 };
- struct api_ws_subcall *sc, *osc;
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
- struct api_ws_client *client = wreq->client;
-
- sc = malloc(sizeof *sc);
- if (!sc) {
-
- } else {
- sc->callback = callback;
- sc->closure = cb_closure;
-
- pthread_mutex_unlock(&client->mutex);
- sc->subcallid = ptr2id(sc);
- do {
- sc->subcallid++;
- osc = client->subcalls;
- while(osc && osc->subcallid != sc->subcallid)
- osc = osc->next;
- } while (osc);
- sc->next = client->subcalls;
- client->subcalls = sc;
- pthread_mutex_unlock(&client->mutex);
-
- if (api_ws_write_char(&wb, CHAR_FOR_SUBCALL_CALL)
- && api_ws_write_uint32(&wb, wreq->msgid)
- && api_ws_write_uint32(&wb, sc->subcallid)
- && api_ws_write_string(&wb, api)
- && api_ws_write_string(&wb, verb)
- && api_ws_write_object(&wb, args)) {
- rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
- if (rc >= 0)
- return;
- }
- ERROR("error while sending fail");
- }
-}
-
-static int api_ws_server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event)
-{
- int rc, rc2;
- struct writebuf wb = { .count = 0 };
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
-
- rc = afb_evt_add_watch(wreq->client->listener, event);
- if (rc < 0)
- return rc;
-
- if (api_ws_write_char(&wb, CHAR_FOR_EVT_SUBSCRIBE)
- && 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_cb(struct afb_xreq *xreq, struct afb_event event)
-{
- int rc, rc2;
- struct writebuf wb = { .count = 0 };
- struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
-
- if (api_ws_write_char(&wb, CHAR_FOR_EVT_UNSUBSCRIBE)
- && 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;
}
-/******************* server part **********************************/
-
-static int api_ws_server_connect(struct api_ws *api);
+static int api_ws_server_connect(struct api_ws *apiws);
static int api_ws_server_listen_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
{
+ struct api_ws *apiws = closure;
+
if ((revents & EPOLLIN) != 0)
- api_ws_server_accept(closure);
+ api_ws_server_accept(apiws);
if ((revents & EPOLLHUP) != 0)
- api_ws_server_connect(closure);
+ api_ws_server_connect(apiws);
return 0;
}
-static void api_ws_server_disconnect(struct api_ws *api)
+static void api_ws_server_disconnect(struct api_ws *apiws)
{
- if (api->server.listensrc != NULL) {
- sd_event_source_unref(api->server.listensrc);
- api->server.listensrc = NULL;
+ if (apiws->listensrc != NULL) {
+ sd_event_source_unref(apiws->listensrc);
+ apiws->listensrc = NULL;
}
- if (api->fd >= 0) {
- close(api->fd);
- api->fd = -1;
+ if (apiws->fd >= 0) {
+ close(apiws->fd);
+ apiws->fd = -1;
}
}
-static int api_ws_server_connect(struct api_ws *api)
+static int api_ws_server_connect(struct api_ws *apiws)
{
int rc;
/* ensure disconnected */
- api_ws_server_disconnect(api);
+ api_ws_server_disconnect(apiws);
/* 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);
+ apiws->fd = api_ws_socket(apiws->path, 1);
+ if (apiws->fd < 0)
+ ERROR("can't create socket %s", apiws->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);
+ rc = sd_event_add_io(afb_common_get_event_loop(),
+ &apiws->listensrc, apiws->fd, EPOLLIN,
+ api_ws_server_listen_callback, apiws);
if (rc >= 0)
return 0;
- close(api->fd);
+ close(apiws->fd);
errno = -rc;
- ERROR("can't add ws object %s", api->path);
+ ERROR("can't add ws object %s", apiws->path);
}
return -1;
}
int afb_api_ws_add_server(const char *path, struct afb_apiset *apiset)
{
int rc;
- struct api_ws *api;
+ struct api_ws *apiws;
/* creates the ws api object */
- api = api_ws_make(path);
- if (api == NULL)
+ apiws = api_ws_make(path);
+ if (apiws == NULL)
goto error;
/* connect for serving */
- rc = api_ws_server_connect(api);
+ rc = api_ws_server_connect(apiws);
if (rc < 0)
goto error2;
- api->server.apiset = afb_apiset_addref(apiset);
+ apiws->apiset = afb_apiset_addref(apiset);
return 0;
error2:
- free(api);
+ free(apiws);
error:
return -1;
}
--- /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/afb-req-itf.h>
+
+#include "afb-common.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-stub-ws.h"
+#include "afb-context.h"
+#include "afb-evt.h"
+#include "afb-xreq.h"
+#include "verbose.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
+ */
+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 */
+};
+
+/*
+ * structure for recording events on client side
+ */
+struct client_event
+{
+ struct client_event *next;
+ struct afb_event event;
+ int eventid;
+ int refcount;
+};
+
+/******************* client description part for server *****************************/
+
+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;
+
+ /* apiset */
+ struct afb_apiset *apiset;
+
+ /* the api name */
+ char apiname[1];
+};
+
+/******************* 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 *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 *****************/
+
+/* decrement the reference count of the request and free/release it on falling to null */
+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_stub_ws_unref(wreq->stubws);
+ free(wreq);
+}
+
+static void server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, 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:
+ 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)
+{
+ 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) {
+
+ } 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);
+ 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:
+ return rc;
+}
+
+static int server_req_unsubscribe_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);
+
+ 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);
+ return rc;
+}
+
+static const struct afb_xreq_query_itf server_req_xreq_itf = {
+ .success = server_req_success_cb,
+ .fail = server_req_fail_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)
+{
+ struct client_call *call;
+
+ call = stubws->calls;
+ while (call != NULL && call->msgid != msgid)
+ call = call->next;
+
+ return call;
+}
+
+/* search the event */
+static struct client_event *client_event_search(struct afb_stub_ws *stubws, uint32_t eventid, const char *name)
+{
+ 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;
+
+ return ev;
+}
+
+
+/* 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;
+ }
+ return call;
+}
+
+/* free and release the memorizing call */
+static void client_call_destroy(struct client_call *call)
+{
+ struct client_call **prv;
+
+ prv = &call->stubws->calls;
+ while (*prv != NULL) {
+ if (*prv == call) {
+ *prv = call->next;
+ break;
+ }
+ prv = &(*prv)->next;
+ }
+
+ afb_xreq_unref(call->xreq);
+ 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_event_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_event **ev)
+{
+ const char *name;
+ uint32_t eventid;
+
+ /* get event data from the message */
+ if (!client_msg_event_read(rb, &eventid, &name)) {
+ ERROR("Invalid message");
+ return 0;
+ }
+
+ /* check conflicts */
+ *ev = client_event_search(stubws, eventid, name);
+ if (*ev == NULL) {
+ ERROR("event %s not found", name);
+ return 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)
+{
+ uint32_t msgid;
+
+ /* get event data from the message */
+ if (!readbuf_uint32(rb, &msgid)) {
+ ERROR("Invalid message");
+ return 0;
+ }
+
+ /* get the call */
+ *call = client_call_search(stubws, msgid);
+ if (*call == NULL) {
+ ERROR("message not found");
+ return 0;
+ }
+
+ 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)
+{
+ return client_msg_call_get(stubws, rb, call) && client_msg_event_get(stubws, rb, ev);
+}
+
+/* adds an event */
+static void client_event_create(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ 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;
+ }
+
+ /* 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);
+}
+
+/* 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;
+
+ /* unlinks the event */
+ prv = &stubws->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 client_event_subscribe(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ struct client_event *ev;
+ struct client_call *call;
+
+ 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");
+ }
+}
+
+/* unsubscribes an event */
+static void client_event_unsubscribe(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ struct client_event *ev;
+ struct client_call *call;
+
+ 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");
+ }
+}
+
+/* receives broadcasted events */
+static void client_event_broadcast(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ struct json_object *object;
+ const char *event;
+
+ if (readbuf_string(rb, &event, NULL) && readbuf_object(rb, &object))
+ afb_evt_broadcast(event, object);
+ else
+ ERROR("unreadable broadcasted event");
+}
+
+/* pushs an event */
+static void client_event_push(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ struct client_event *ev;
+ struct json_object *object;
+
+ if (client_msg_event_get(stubws, rb, &ev) && readbuf_object(rb, &object))
+ afb_event_push(ev->event, object);
+ else
+ ERROR("unreadable push event");
+}
+
+static void client_reply_success(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ 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);
+}
+
+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;
+
+ 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");
+ }
+ client_call_destroy(call);
+}
+
+/* send a subcall reply */
+static void client_send_subcall_reply(struct client_subcall *subcall, int iserror, json_object *object)
+{
+ 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;
+ }
+
+ rc = afb_ws_binary_v(subcall->stubws->ws, wb.iovec, wb.count);
+ if (rc >= 0)
+ return;
+ ERROR("error while sending subcall reply");
+}
+
+/* callback for subcall reply */
+static void client_subcall_reply_cb(void *closure, int iserror, json_object *object)
+{
+ client_send_subcall_reply(closure, iserror, object);
+ free(closure);
+}
+
+/* received a subcall request */
+static void client_subcall(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ 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;
+
+ 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);
+ }
+}
+
+/* callback when receiving binary data */
+static void client_on_binary(void *closure, char *data, size_t size)
+{
+ 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);
+}
+
+/* on call, propagate it to the ws service */
+static void client_call_cb(void * closure, struct afb_xreq *xreq)
+{
+ 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);
+}
+
+/******************* 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)
+{
+ struct server_req *wreq;
+ char *cverb;
+ const char *uuid, *verb;
+ uint32_t flags, msgid;
+ size_t lenverb;
+ struct json_object *object;
+
+ 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;
+
+ /* create the request */
+ wreq = malloc(++lenverb + 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);
+
+ /* init the context */
+ if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0)
+ goto unconnected;
+ wreq->xreq.context.flags = flags;
+
+ /* makes the call */
+ wreq->xreq.cred = afb_cred_addref(stubws->cred);
+ wreq->xreq.api = stubws->apiname;
+ wreq->xreq.verb = cverb;
+ wreq->xreq.json = object;
+ afb_xreq_process(&wreq->xreq, stubws->apiset);
+ return;
+
+unconnected:
+ free(wreq);
+out_of_memory:
+ json_object_put(object);
+overflow:
+ afb_stub_ws_unref(stubws);
+}
+
+/* on subcall reply */
+static void server_on_subcall_reply(struct afb_stub_ws *stubws, struct readbuf *rb)
+{
+ 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);
+}
+
+/* callback when receiving binary data */
+static void server_on_binary(void *closure, char *data, size_t size)
+{
+ 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);
+}
+
+/******************* server part: manage events **********************************/
+
+static void server_event_send(struct afb_stub_ws *stubws, char order, const char *event, int eventid, const char *data)
+{
+ 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);
+}
+
+static void server_event_add(void *closure, const char *event, int eventid)
+{
+ server_event_send(closure, CHAR_FOR_EVT_ADD, event, eventid, NULL);
+}
+
+static void server_event_remove(void *closure, const char *event, int eventid)
+{
+ server_event_send(closure, CHAR_FOR_EVT_DEL, event, eventid, NULL);
+}
+
+static void 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);
+ server_event_send(closure, CHAR_FOR_EVT_PUSH, event, eventid, data ? : "null");
+ json_object_put(object);
+}
+
+static void server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object)
+{
+ int rc;
+ struct afb_stub_ws *stubws = closure;
+
+ struct writebuf wb = { .count = 0 };
+
+ 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);
+}
+
+/*****************************************************/
+
+/* callback when receiving a hangup */
+static void server_on_hangup(void *closure)
+{
+ struct afb_stub_ws *stubws = closure;
+
+ /* close the socket */
+ if (stubws->fd >= 0) {
+ close(stubws->fd);
+ stubws->fd = -1;
+ }
+
+ /* release the client */
+ afb_stub_ws_unref(stubws);
+}
+
+/*****************************************************/
+
+/* 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 =
+{
+ .on_close = NULL,
+ .on_text = NULL,
+ .on_binary = client_on_binary,
+ .on_error = NULL,
+ .on_hangup = NULL
+};
+
+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
+};
+
+/*****************************************************/
+
+static struct afb_stub_ws *afb_stub_ws_create(int fd, const char *apiname, struct afb_apiset *apiset, const struct afb_ws_itf *itf)
+{
+ struct afb_stub_ws *stubws;
+
+ stubws = calloc(1, sizeof *stubws + 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;
+ strcpy(stubws->apiname, apiname);
+ stubws->apiset = afb_apiset_addref(apiset);
+ stubws->refcount = 1;
+ stubws->subcalls = NULL;
+ return stubws;
+ }
+ free(stubws);
+ }
+ return NULL;
+}
+
+struct afb_stub_ws *afb_stub_ws_create_client(int fd, 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;
+
+}
+
+struct afb_stub_ws *afb_stub_ws_create_server(int fd, const char *apiname, struct afb_apiset *apiset)
+{
+ struct afb_stub_ws *stubws;
+
+ stubws = afb_stub_ws_create(fd, apiname, apiset, &server_ws_itf);
+ if (stubws) {
+ stubws->cred = afb_cred_create_for_socket(fd);
+ stubws->listener = afb_evt_listener_create(&server_evt_itf, stubws);
+ if (stubws->listener != NULL)
+ return stubws;
+ afb_stub_ws_unref(stubws);
+ }
+ return NULL;
+}
+
+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);
+ }
+ afb_cred_unref(stubws->cred);
+ afb_apiset_unref(stubws->apiset);
+ free(stubws);
+ }
+}
+
+void afb_stub_ws_addref(struct afb_stub_ws *stubws)
+{
+ __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
+}
+
+/*
+static void client_disconnect(struct afb_stub_ws *stubws)
+{
+ if (stubws->fd >= 0) {
+ afb_ws_destroy(stubws->ws);
+ stubws->ws = NULL;
+ close(stubws->fd);
+ stubws->fd = -1;
+ }
+}
+*/
+
Code Review / src / app-framework-binder.git / commitdiff