// add a new peer to the session
struct corerouter_peer *uwsgi_cr_peer_add(struct corerouter_session *cs) {
struct corerouter_peer *old_peers = NULL, *peers = cs->peers;
while(peers) {
old_peers = peers;
peers = peers->next;
}
peers = uwsgi_calloc(sizeof(struct corerouter_peer));
peers->session = cs;
peers->fd = -1;
// create input buffer
size_t bufsize = cs->corerouter->buffer_size;
if (!bufsize) bufsize = uwsgi.page_size;
peers->in = uwsgi_buffer_new(bufsize);
// add timeout
peers->current_timeout = cs->corerouter->socket_timeout;
peers->timeout = cr_add_timeout(cs->corerouter, peers);
peers->prev = old_peers;
if (old_peers) {
old_peers->next = peers;
}
else {
cs->peers = peers;
}
return peers;
}
struct corerouter_session *corerouter_alloc_session(struct uwsgi_corerouter *ucr, struct uwsgi_gateway_socket *ugs, int new_connection, struct sockaddr *cr_addr, socklen_t cr_addr_len) {
ucr->cr_table[new_connection] = uwsgi_calloc(ucr->session_size);
ucr->cr_table[new_connection]->fd = new_connection;
ucr->cr_table[new_connection]->instance_fd = -1;
ucr->cr_table[new_connection]->status = COREROUTER_STATUS_RECV_HDR;
ucr->cr_table[new_connection]->timeout = cr_add_timeout(ucr, ucr->cr_table[new_connection]);
ucr->cr_table[new_connection]->ugs = ugs;
ucr->alloc_session(ucr, ugs, ucr->cr_table[new_connection], cr_addr, cr_addr_len);
event_queue_add_fd_read(ucr->queue, new_connection);
return ucr->cr_table[new_connection];
}
struct corerouter_session *corerouter_alloc_session(struct uwsgi_corerouter *ucr, struct uwsgi_gateway_socket *ugs, int new_connection, struct sockaddr *cr_addr, socklen_t cr_addr_len) {
ucr->cr_table[new_connection] = uwsgi_calloc(ucr->session_size);
ucr->cr_table[new_connection]->fd = new_connection;
ucr->cr_table[new_connection]->instance_fd = -1;
// map courerouter and socket
ucr->cr_table[new_connection]->corerouter = ucr;
ucr->cr_table[new_connection]->ugs = ugs;
// set initial timeout
ucr->cr_table[new_connection]->timeout = cr_add_timeout(ucr, ucr->cr_table[new_connection]);
// create dynamic buffer
ucr->cr_table[new_connection]->buffer = uwsgi_buffer_new(uwsgi.page_size);
// here we prepare the real session and set the hooks
ucr->alloc_session(ucr, ugs, ucr->cr_table[new_connection], cr_addr, cr_addr_len);
return ucr->cr_table[new_connection];
}
struct corerouter_session *corerouter_alloc_session(struct uwsgi_corerouter *ucr, struct uwsgi_gateway_socket *ugs, int new_connection, struct sockaddr *cr_addr, socklen_t cr_addr_len) {
struct corerouter_session *cs = uwsgi_calloc(ucr->session_size);
struct corerouter_peer *peer = uwsgi_calloc(sizeof(struct corerouter_peer));
// main_peer has only input buffer as output buffer is taken from backend peers
size_t bufsize = ucr->buffer_size;
if (!bufsize) bufsize = uwsgi.page_size;
peer->in = uwsgi_buffer_new(bufsize);
ucr->cr_table[new_connection] = peer;
cs->main_peer = peer;
peer->fd = new_connection;
peer->session = cs;
// map corerouter and socket
cs->corerouter = ucr;
cs->ugs = ugs;
// set initial timeout (could be overridden)
peer->current_timeout = ucr->socket_timeout;
ucr->active_sessions++;
// build the client address
memcpy(&cs->client_sockaddr, cr_addr, cr_addr_len);
switch(cr_addr->sa_family) {
case AF_INET:
if (inet_ntop(AF_INET, &cs->client_sockaddr.sa_in.sin_addr, cs->client_address, cr_addr_len) == NULL) {
uwsgi_error("corerouter_alloc_session/inet_ntop()");
memcpy(cs->client_address, "0.0.0.0", 7);
cs->client_port[0] = '0';
cs->client_port[1] = 0;
}
uwsgi_num2str2(cs->client_sockaddr.sa_in.sin_port, cs->client_port);
break;
#ifdef AF_INET6
case AF_INET6:
if (inet_ntop(AF_INET6, &cs->client_sockaddr.sa_in6.sin6_addr, cs->client_address, cr_addr_len) == NULL) {
uwsgi_error("corerouter_alloc_session/inet_ntop()");
memcpy(cs->client_address, "0.0.0.0", 7);
cs->client_port[0] = '0';
cs->client_port[1] = 0;
}
uwsgi_num2str2(cs->client_sockaddr.sa_in6.sin6_port, cs->client_port);
break;
#endif
default:
memcpy(cs->client_address, "0.0.0.0", 7);
cs->client_port[0] = '0';
cs->client_port[1] = 0;
break;
}
// here we prepare the real session and set the hooks
if (ucr->alloc_session(ucr, ugs, cs, cr_addr, cr_addr_len)) {
corerouter_close_session(ucr, cs);
cs = NULL;
}
else {
// truly set the timeout
peer->timeout = cr_add_timeout(ucr, ucr->cr_table[new_connection]);
}
return cs;
}
struct uwsgi_rb_timer *corerouter_reset_timeout(struct uwsgi_corerouter *ucr, struct corerouter_peer *peer) {
cr_del_timeout(ucr, peer);
return cr_add_timeout(ucr, peer);
}
void corerouter_close_peer(struct uwsgi_corerouter *ucr, struct corerouter_peer *peer) {
struct corerouter_session *cs = peer->session;
// manage subscription reference count
if (ucr->subscriptions && peer->un && peer->un->len > 0) {
// decrease reference count
#ifdef UWSGI_DEBUG
uwsgi_log("[1] node %.*s refcnt: %llu\n", peer->un->len, peer->un->name, peer->un->reference);
#endif
peer->un->reference--;
#ifdef UWSGI_DEBUG
uwsgi_log("[2] node %.*s refcnt: %llu\n", peer->un->len, peer->un->name, peer->un->reference);
#endif
}
if (peer->failed) {
if (peer->soopt) {
if (!ucr->quiet)
uwsgi_log("[uwsgi-%s] unable to connect() to node \"%.*s\" (%d retries): %s\n", ucr->short_name, (int) peer->instance_address_len, peer->instance_address, peer->retries, strerror(peer->soopt));
}
else if (peer->timed_out) {
if (peer->instance_address_len > 0) {
if (peer->connecting) {
if (!ucr->quiet)
uwsgi_log("[uwsgi-%s] unable to connect() to node \"%.*s\" (%d retries): timeout\n", ucr->short_name, (int) peer->instance_address_len, peer->instance_address, peer->retries);
}
}
}
// now check for dead nodes
if (ucr->subscriptions && peer->un && peer->un->len > 0) {
if (peer->un->death_mark == 0)
uwsgi_log("[uwsgi-%s] %.*s => marking %.*s as failed\n", ucr->short_name, (int) peer->key_len, peer->key, (int) peer->instance_address_len, peer->instance_address);
peer->un->failcnt++;
peer->un->death_mark = 1;
// check if i can remove the node
if (peer->un->reference == 0) {
uwsgi_remove_subscribe_node(ucr->subscriptions, peer->un);
}
if (ucr->cheap && !ucr->i_am_cheap && !ucr->fallback && uwsgi_no_subscriptions(ucr->subscriptions)) {
uwsgi_gateway_go_cheap(ucr->name, ucr->queue, &ucr->i_am_cheap);
}
}
else if (peer->static_node) {
peer->static_node->custom = uwsgi_now();
uwsgi_log("[uwsgi-%s] %.*s => marking %.*s as failed\n", ucr->short_name, (int) peer->key_len, peer->key, (int) peer->instance_address_len, peer->instance_address);
}
// check if the router supports the retry hook
if (!peer->can_retry) goto end;
if (peer->retries >= (size_t) ucr->max_retries) goto end;
peer->retries++;
// reset the peer
uwsgi_cr_peer_reset(peer);
// set new timeout
peer->timeout = cr_add_timeout(ucr, peer);
if (ucr->fallback) {
// ok let's try with the fallback nodes
if (!cs->fallback) {
cs->fallback = ucr->fallback;
}
else {
cs->fallback = cs->fallback->next;
if (!cs->fallback) goto end;
}
peer->instance_address = cs->fallback->value;
peer->instance_address_len = cs->fallback->len;
if (cs->retry(peer)) {
if (!peer->failed) goto end;
}
return;
}
peer->instance_address = NULL;
peer->instance_address_len = 0;
if (cs->retry(peer)) {
if (!peer->failed) goto end;
}
return;
}
end:
uwsgi_cr_peer_del(peer);
if (peer == cs->main_peer) {
cs->main_peer = NULL;
corerouter_close_session(ucr, cs);
}
else {
if (cs->can_keepalive == 0 && cs->wait_full_write == 0) {
corerouter_close_session(ucr, cs);
}
}
}
static struct uwsgi_rb_timer *corerouter_reset_timeout(struct uwsgi_corerouter *ucr, struct corerouter_session *cr_session) {
cr_del_timeout(ucr, cr_session);
return cr_add_timeout(ucr, cr_session);
}