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MINOR: srv: close all idle connections on shutdown

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Implement a function to close all server idle connections. This function
is called via a global deinit server handler.

The main objective is to prevents from leaving sockets in TIME_WAIT
state. To limit the set of operations on shutdown and prevents
tasks rescheduling, only the ctrl stack closing is done.
This commit is contained in:
Amaury Denoyelle 2021-04-29 17:30:05 +02:00
parent 04b57a7d1b
commit 3109ccfe70
1 changed files with 37 additions and 0 deletions
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37
src/server.c
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@ -5317,6 +5317,43 @@ remove:
return task;
}
/* Close remaining idle connections. This functions is designed to be run on
* process shutdown. This guarantees a proper socket shutdown to avoid
* TIME_WAIT state. For a quick operation, only ctrl is closed, xprt stack is
* bypassed.
*
* This function is not thread-safe so it must only be called via a global
* deinit function.
*/
static void srv_close_idle_conns(struct server *srv)
{
struct eb_root **cleaned_tree;
int i;
for (i = 0; i < global.nbthread; ++i) {
struct eb_root *conn_trees[] = {
&srv->per_thr[i].idle_conns,
&srv->per_thr[i].safe_conns,
&srv->per_thr[i].avail_conns,
NULL
};
for (cleaned_tree = conn_trees; *cleaned_tree; ++cleaned_tree) {
while (!eb_is_empty(*cleaned_tree)) {
struct ebmb_node *node = ebmb_first(*cleaned_tree);
struct conn_hash_node *conn_hash_node = ebmb_entry(node, struct conn_hash_node, node);
struct connection *conn = conn_hash_node->conn;
if (conn->ctrl->ctrl_close)
conn->ctrl->ctrl_close(conn);
ebmb_delete(node);
}
}
}
}
REGISTER_SERVER_DEINIT(srv_close_idle_conns);
/* config parser for global "tune.idle-pool.shared", accepts "on" or "off" */
static int cfg_parse_idle_pool_shared(char **args, int section_type, struct proxy *curpx,
const struct proxy *defpx, const char *file, int line,