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|
/*
* 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) {
callback(cb_closure, 1, afb_msg_json_internal_error());
} else {
sc->callback = callback;
sc->closure = cb_closure;
pthread_mutex_unlock(&stubws->mutex);
sc->subcallid = ptr2id(sc);
do {
sc->subcallid++;
osc = stubws->subcalls;
while(osc && osc->subcallid != sc->subcallid)
osc = osc->next;
} while (osc);
sc->next = stubws->subcalls;
stubws->subcalls = sc;
pthread_mutex_unlock(&stubws->mutex);
if (writebuf_char(&wb, CHAR_FOR_SUBCALL_CALL)
&& writebuf_uint32(&wb, wreq->msgid)
&& writebuf_uint32(&wb, sc->subcallid)
&& writebuf_string(&wb, api)
&& writebuf_string(&wb, verb)
&& writebuf_object(&wb, args)) {
rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count);
if (rc >= 0)
return;
}
ERROR("error while sending fail");
}
}
static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event)
{
int rc, rc2;
struct writebuf wb = { .count = 0 };
struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
rc = afb_evt_add_watch(wreq->stubws->listener, event);
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);
}
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