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/*******************************************************************************
* Copyright (c) 2007, 2012 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
/*
* Implements auto-discovery and Locator service.
*/
#include <tcf/config.h>
#include <stddef.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <tcf/framework/protocol.h>
#include <tcf/framework/channel.h>
#include <tcf/framework/proxy.h>
#include <tcf/framework/myalloc.h>
#include <tcf/framework/events.h>
#include <tcf/framework/trace.h>
#include <tcf/framework/exceptions.h>
#include <tcf/framework/json.h>
#include <tcf/framework/peer.h>
#include <tcf/services/discovery.h>
#include <tcf/services/discovery_udp.h>
#if SERVICE_Locator
static const char * LOCATOR = "Locator";
static int peer_cnt = 0;
static int write_peer_properties(PeerServer * ps, void * arg) {
unsigned i;
OutputStream * out = (OutputStream *)arg;
if (peer_cnt > 0) write_stream(out, ',');
write_stream(out, '{');
json_write_string(out, "ID");
write_stream(out, ':');
json_write_string(out, ps->id);
for (i = 0; i < ps->ind; i++) {
write_stream(out, ',');
json_write_string(out, ps->list[i].name);
write_stream(out, ':');
json_write_string(out, ps->list[i].value);
}
write_stream(out, '}');
peer_cnt++;
return 0;
}
static void command_sync(char * token, Channel * c) {
json_test_char(&c->inp, MARKER_EOM);
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, 0);
write_stream(&c->out, MARKER_EOM);
}
typedef struct RedirectInfo {
Channel * channel;
char token[256];
} RedirectInfo;
static void connect_done(void * args, int error, Channel * c2) {
RedirectInfo * info = (RedirectInfo *)args;
Channel * c1 = info->channel;
if (!is_channel_closed(c1)) {
assert(c1->state == ChannelStateRedirectReceived);
if (!error) {
proxy_create(c1, c2);
}
else {
c1->state = ChannelStateConnected;
}
write_stringz(&c1->out, "R");
write_stringz(&c1->out, info->token);
write_errno(&c1->out, error);
write_stream(&c1->out, MARKER_EOM);
}
else if (!error) {
channel_close(c2);
}
channel_unlock(c1);
loc_free(info);
}
static void read_peer_attr(InputStream * inp, const char * name, void * x) {
peer_server_addprop((PeerServer *)x, loc_strdup(name), json_read_alloc_string(inp));
}
static void command_redirect(char * token, Channel * c) {
PeerServer * ps;
int free_ps = 0;
assert(c->state == ChannelStateConnected);
if (peek_stream(&c->inp) == '{') {
ps = peer_server_alloc();
json_read_struct(&c->inp, read_peer_attr, ps);
free_ps = 1;
}
else {
char id[256];
json_read_string(&c->inp, id, sizeof(id));
ps = peer_server_find(id);
}
json_test_char(&c->inp, MARKER_EOA);
json_test_char(&c->inp, MARKER_EOM);
if (ps != NULL) {
RedirectInfo * info = (RedirectInfo *)loc_alloc_zero(sizeof(RedirectInfo));
channel_lock(c);
c->state = ChannelStateRedirectReceived;
info->channel = c;
strlcpy(info->token, token, sizeof(info->token));
channel_connect(ps, connect_done, info);
}
else {
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, ERR_UNKNOWN_PEER);
write_stream(&c->out, MARKER_EOM);
}
if (free_ps) peer_server_free(ps);
}
static void command_get_peers(char * token, Channel * c) {
json_test_char(&c->inp, MARKER_EOM);
write_stringz(&c->out, "R");
write_stringz(&c->out, token);
write_errno(&c->out, 0);
write_stream(&c->out, '[');
peer_cnt = 0;
peer_server_iter(write_peer_properties, &c->out);
write_stream(&c->out, ']');
write_stream(&c->out, 0);
write_stream(&c->out, MARKER_EOM);
}
static void peer_change_event(PeerServer * ps, int type, void * arg) {
OutputStream * out = (OutputStream *)arg;
if ((ps->flags & PS_FLAG_DISCOVERABLE) == 0) return;
write_stringz(out, "E");
write_stringz(out, LOCATOR);
switch (type) {
case PS_EVENT_ADDED:
write_stringz(out, "peerAdded");
peer_cnt = 0;
write_peer_properties(ps, out);
break;
case PS_EVENT_CHANGED:
write_stringz(out, "peerChanged");
peer_cnt = 0;
write_peer_properties(ps, out);
break;
case PS_EVENT_HEART_BEAT:
write_stringz(out, "peerHeartBeat");
json_write_string(out, ps->id);
break;
case PS_EVENT_REMOVED:
write_stringz(out, "peerRemoved");
json_write_string(out, ps->id);
break;
}
write_stream(out, 0);
write_stream(out, MARKER_EOM);
}
void ini_locator_service(Protocol * p, TCFBroadcastGroup * bcg) {
assert(is_dispatch_thread());
peer_server_add_listener(peer_change_event, &bcg->out);
add_command_handler(p, LOCATOR, "sync", command_sync);
add_command_handler(p, LOCATOR, "redirect", command_redirect);
add_command_handler(p, LOCATOR, "getPeers", command_get_peers);
}
#endif /* SERVICE_Locator */
void discovery_start(void) {
#if ENABLE_Discovery
discovery_start_udp();
#endif
}
void discovery_stop(void) {
#if ENABLE_Discovery
discovery_stop_udp();
#endif
}
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