Templates separation between binding API hat and Callbacks

Change-Id: I4c405c0ae02f50f03f9b4e71ebbdcd74f51e4ac8
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

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;
+}
+