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/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Fulup Ar Foll"
* 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
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <systemd/sd-event.h>
#include "afb-wsj1.h"
#include "afb-ws-client.h"
/* declaration of functions */
static void on_hangup(void *closure, struct afb_wsj1 *wsj1);
static void on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg);
static void on_event(void *closure, const char *event, struct afb_wsj1_msg *msg);
static int io_event_callback(sd_event_source *src, int fd, uint32_t revents, void *closure);
static void emit(const char *api, const char *verb, const char *object);
/* the callback interface for wsj1 */
static struct afb_wsj1_itf itf = {
.on_hangup = on_hangup,
.on_call = on_call,
.on_event = on_event
};
/* global variables */
static struct afb_wsj1 *wsj1;
static int exonrep;
static int callcount;
static sd_event_source *evsrc;
/* print usage of the program */
static void usage(int status, char *arg0)
{
char *name = strrchr(arg0, '/');
name = name ? name + 1 : arg0;
fprintf(status ? stderr : stdout, "usage: %s uri [api verb [data]]\n", name);
exit(status);
}
/* entry function */
int main(int ac, char **av, char **env)
{
int rc;
sd_event *loop;
/* check the argument count */
if (ac != 2 && ac != 4 && ac != 5)
usage(1, av[0]);
/* emit error and exit if requested */
if (!strcmp(av[1], "-h") || !strcmp(av[1], "--help"))
usage(0, av[0]);
/* get the default event loop */
rc = sd_event_default(&loop);
if (rc < 0) {
fprintf(stderr, "connection to default event loop failed: %s\n", strerror(-rc));
return 1;
}
/* connect the websocket wsj1 to the uri given by the first argument */
wsj1 = afb_ws_client_connect_wsj1(loop, av[1], &itf, NULL);
if (wsj1 == NULL) {
fprintf(stderr, "connection to %s failed: %m\n", av[1]);
return 1;
}
/* test the behaviour */
if (ac == 2) {
/* get requests from stdin */
fcntl(0, F_SETFL, O_NONBLOCK);
sd_event_add_io(loop, &evsrc, 0, EPOLLIN, io_event_callback, NULL);
} else {
/* the request is defined by the arguments */
exonrep = 1;
emit(av[2], av[3], av[4]);
}
/* loop until end */
for(;;)
sd_event_run(loop, 30000000);
return 0;
}
/* called when wsj1 hangsup */
static void on_hangup(void *closure, struct afb_wsj1 *wsj1)
{
printf("ON-HANGUP\n");
exit(0);
}
/* called when wsj1 receives a method invocation */
static void on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
int rc;
printf("ON-CALL %s/%s(%s)\n", api, verb, afb_wsj1_msg_object_s(msg));
rc = afb_wsj1_reply_error_s(msg, "\"unimplemented\"", NULL);
if (rc < 0)
fprintf(stderr, "replying failed: %m\n");
}
/* called when wsj1 receives an event */
static void on_event(void *closure, const char *event, struct afb_wsj1_msg *msg)
{
printf("ON-EVENT %s(%s)\n", event, afb_wsj1_msg_object_s(msg));
}
/* called when wsj1 receives a reply */
static void on_reply(void *closure, struct afb_wsj1_msg *msg)
{
printf("ON-REPLY %s: %s\n", (char*)closure, afb_wsj1_msg_object_s(msg));
free(closure);
callcount--;
if (exonrep && !callcount)
//afb_wsj1_hangup(afb_wsj1_msg_wsj1(msg));
exit(0);
}
/* makes a call */
static void call(const char *api, const char *verb, const char *object)
{
static int num = 0;
char *key;
int rc;
/* allocates an id for the request */
rc = asprintf(&key, "%d:%s/%s", ++num, api, verb);
/* send the request */
callcount++;
rc = afb_wsj1_call_s(wsj1, api, verb, object, on_reply, key);
if (rc < 0) {
fprintf(stderr, "calling %s/%s(%s) failed: %m\n", api, verb, object);
callcount--;
}
}
/* sends an event */
static void event(const char *event, const char *object)
{
int rc;
rc = afb_wsj1_send_event_s(wsj1, event, object);
if (rc < 0)
fprintf(stderr, "sending !%s(%s) failed: %m\n", event, object);
}
/* emits either a call (when api!='!') or an event */
static void emit(const char *api, const char *verb, const char *object)
{
if (object == NULL || object[0] == 0)
object = "null";
if (api[0] == '!' && api[1] == 0)
event(verb, object);
else
call(api, verb, object);
}
/* called when something happens on stdin */
static int io_event_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
{
static size_t count = 0;
static char line[16384];
static char sep[] = " \t";
static char sepnl[] = " \t\n";
ssize_t rc;
size_t pos;
/* read the buffer */
do { rc = read(0, line + count, sizeof line - count); } while (rc < 0 && errno == EINTR);
if (rc < 0) {
fprintf(stderr, "read error: %m\n");
exit(1);
}
if (rc == 0) {
if (!callcount)
exit(0);
exonrep = 1;
sd_event_source_unref(evsrc);
}
count += (size_t)rc;
/* normalise the buffer content */
/* TODO: handle backspace \x7f ? */
/* process the lines */
pos = 0;
for(;;) {
size_t i, api[2], verb[2], rest[2];
i = pos;
while(i < count && strchr(sep, line[i])) i++;
api[0] = i; while(i < count && !strchr(sepnl, line[i])) i++; api[1] = i;
while(i < count && strchr(sep, line[i])) i++;
verb[0] = i; while(i < count && !strchr(sepnl, line[i])) i++; verb[1] = i;
while(i < count && strchr(sep, line[i])) i++;
rest[0] = i; while(i < count && line[i] != '\n') i++; rest[1] = i;
if (i == count) break;
line[i++] = 0;
if (api[0] == api[1] || verb[0] == verb[1])
fprintf(stderr, "bad line: %s\n", line+pos);
else {
line[api[1]] = line[verb[1]] = 0;
emit(line + api[0], line + verb[0], line + rest[0]);
}
pos = i;
}
count -= pos;
if (count == sizeof line) {
fprintf(stderr, "overflow\n");
exit(1);
}
if (count)
memmove(line, line + pos, count);
return 1;
}
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