From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 21 Oct 2012 21:01:12 +0000 (+0200)
Subject: ustream: add example code
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=commitdiff_plain;h=d3b328005573de83646bd3bc156ec82859c0441c

ustream: add example code
---

diff --git a/examples/ustream-example.c b/examples/ustream-example.c
new file mode 100644
index 0000000..00c7122
--- /dev/null
+++ b/examples/ustream-example.c
@@ -0,0 +1,147 @@
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ustream.h"
+#include "uloop.h"
+#include "usock.h"
+
+static struct uloop_fd server;
+static const char *port = "10000";
+struct client *next_client = NULL;
+
+struct client {
+	struct sockaddr_in sin;
+
+	struct ustream_fd s;
+	int ctr;
+};
+
+static void client_read_cb(struct ustream *s, int bytes)
+{
+	struct client *cl = container_of(s, struct client, s);
+	struct ustream_buf *buf = s->r.head;
+	char *newline, *str;
+
+	do {
+		str = ustream_get_read_buf(s, NULL);
+		if (!str)
+			break;
+
+		newline = strchr(buf->data, '\n');
+		if (!newline)
+			break;
+
+		*newline = 0;
+		ustream_printf(s, "%s\n", str);
+		ustream_consume(s, newline + 1 - str);
+		cl->ctr += newline + 1 - str;
+	} while(1);
+
+	if (s->w.data_bytes > 256 && ustream_read_blocked(s)) {
+		fprintf(stderr, "Block read, bytes: %d\n", s->w.data_bytes);
+		ustream_set_read_blocked(s, true);
+	}
+}
+
+static void client_close(struct ustream *s)
+{
+	struct client *cl = container_of(s, struct client, s);
+
+	fprintf(stderr, "Connection closed\n");
+	ustream_free(s);
+	close(cl->s.fd.fd);
+	free(cl);
+}
+
+static void client_notify_write(struct ustream *s, int bytes)
+{
+	fprintf(stderr, "Wrote %d bytes, pending: %d\n", bytes, s->w.data_bytes);
+
+	if (s->w.data_bytes < 128 && ustream_read_blocked(s)) {
+		fprintf(stderr, "Unblock read\n");
+		ustream_set_read_blocked(s, false);
+	}
+}
+
+static void client_notify_state(struct ustream *s)
+{
+	struct client *cl = container_of(s, struct client, s);
+
+	if (!s->eof)
+		return;
+
+	fprintf(stderr, "eof!, pending: %d, total: %d\n", s->w.data_bytes, cl->ctr);
+	if (!s->w.data_bytes)
+		return client_close(s);
+
+}
+
+static void server_cb(struct uloop_fd *fd, unsigned int events)
+{
+	struct client *cl;
+	unsigned int sl = sizeof(struct sockaddr_in);
+	int sfd;
+
+	if (!next_client)
+		next_client = calloc(1, sizeof(*next_client));
+
+	cl = next_client;
+	sfd = accept(server.fd, (struct sockaddr *) &cl->sin, &sl);
+	if (sfd < 0) {
+		fprintf(stderr, "Accept failed\n");
+		return;
+	}
+
+	cl->s.stream.string_data = true;
+	cl->s.stream.notify_read = client_read_cb;
+	cl->s.stream.notify_state = client_notify_state;
+	cl->s.stream.notify_write = client_notify_write;
+	ustream_fd_init(&cl->s, sfd);
+	next_client = NULL;
+	fprintf(stderr, "New connection\n");
+}
+
+static int run_server(void)
+{
+
+	server.cb = server_cb;
+	server.fd = usock(USOCK_TCP | USOCK_SERVER | USOCK_IPV4ONLY | USOCK_NUMERIC, "127.0.0.1", port);
+	if (server.fd < 0) {
+		perror("usock");
+		return 1;
+	}
+
+	uloop_init();
+	uloop_fd_add(&server, ULOOP_READ);
+	uloop_run();
+
+	return 0;
+}
+
+static int usage(const char *name)
+{
+	fprintf(stderr, "Usage: %s -p <port>\n", name);
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	int ch;
+
+	while ((ch = getopt(argc, argv, "p:")) != -1) {
+		switch(ch) {
+		case 'p':
+			port = optarg;
+			break;
+		default:
+			return usage(argv[0]);
+		}
+	}
+
+	return run_server();
+}