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authorRomain Forlot <romain.forlot@iot.bzh>2017-05-05 10:58:01 +0200
committerRomain Forlot <romain.forlot@iot.bzh>2017-05-05 10:58:01 +0200
commita02d416c7e199a58dd75b7ec2a9ca45643ec393b (patch)
tree355a2ef1ea30c1f79eddbbdf17f3dc54cc93691e /templates/native/app/xxx-native-app.c
parent9600b8e24fdfa99d44a7c9ebd00ff88b1a34df53 (diff)
Templates separation between binding API hat and Callbacks
Change-Id: I4c405c0ae02f50f03f9b4e71ebbdcd74f51e4ac8 Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Diffstat (limited to 'templates/native/app/xxx-native-app.c')
-rw-r--r--templates/native/app/xxx-native-app.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/templates/native/app/xxx-native-app.c b/templates/native/app/xxx-native-app.c
new file mode 100644
index 0000000..312fd1a
--- /dev/null
+++ b/templates/native/app/xxx-native-app.c
@@ -0,0 +1,242 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Fulup Ar Foll" <fulup@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
+
+#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/afb-wsj1.h>
+#include <afb/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;
+}
+