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MEDIUM: sessions: Don't be responsible for connections anymore.

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Make it so sessions are not responsible for connection anymore, except for
connections that are private, and thus can't be shared, otherwise, as soon
as a request is done, the session will just add the connection to the
orphan connections pool.
This will break http-reuse safe, but it is expected to be fixed later.
This commit is contained in:
Olivier Houchard 2020-01-20 13:56:01 +01:00 committed by Olivier Houchard
parent 59c16fc2cb
commit 2444aa5b66
6 changed files with 57 additions and 149 deletions
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12
include/proto/session.h
View File

@ -121,17 +121,13 @@ static inline int session_add_conn(struct session *sess, struct connection *conn
/* Returns 0 if the session can keep the idle conn, -1 if it was destroyed, or 1 if it was added to the server list */
static inline int session_check_idle_conn(struct session *sess, struct connection *conn)
{
if (sess->idle_conns >= sess->fe->max_out_conns) {
/* We can't keep the connection, let's try to add it to the server idle list */
if (!(conn->flags & CO_FL_PRIVATE) ||
sess->idle_conns >= sess->fe->max_out_conns) {
session_unown_conn(sess, conn);
conn->owner = NULL;
conn->flags &= ~CO_FL_SESS_IDLE;
if (!srv_add_to_idle_list(objt_server(conn->target), conn)) {
/* The server doesn't want it, let's kill the connection right away */
conn->mux->destroy(conn->ctx);
return -1;
}
return 1;
conn->mux->destroy(conn);
return -1;
} else {
conn->flags |= CO_FL_SESS_IDLE;
sess->idle_conns++;

68
src/backend.c
View File

@ -1093,14 +1093,12 @@ int connect_server(struct stream *s)
{
struct connection *cli_conn = objt_conn(strm_orig(s));
struct connection *srv_conn = NULL;
struct connection *old_conn = NULL;
struct conn_stream *srv_cs = NULL;
struct sess_srv_list *srv_list;
struct server *srv;
int reuse = 0;
int reuse_orphan = 0;
int init_mux = 0;
int alloced_cs = 0;
int err;
@ -1123,26 +1121,8 @@ int connect_server(struct stream *s)
}
}
if (!reuse) {
/* no connection was found in our session's list. Pick any
* random one that we could trade against another one.
*/
if (!reuse)
srv_conn = NULL;
if (!LIST_ISEMPTY(&s->sess->srv_list)) {
srv_list = LIST_ELEM(s->sess->srv_list.n, struct sess_srv_list *, srv_list);
if (!LIST_ISEMPTY(&srv_list->conn_list))
srv_conn = LIST_ELEM(srv_list->conn_list.n, struct connection *, session_list);
}
}
/* OK at this point we have this :
* - srv_conn points to an existing connection or NULL
* - if reuse is set, srv_conn holds a valid connection, otherwise it
* points to any of our old connections we may want to trade against
* another one
*/
old_conn = srv_conn;
srv = objt_server(s->target);
@ -1283,29 +1263,6 @@ int connect_server(struct stream *s)
}
}
/* We're about to use another connection, let the mux know we're
* done with this one.
*/
if (old_conn != srv_conn && old_conn && reuse && !reuse_orphan) {
struct session *sess = srv_conn->owner;
if (sess) {
if (old_conn && !(old_conn->flags & CO_FL_PRIVATE) &&
old_conn->mux != NULL) {
if (old_conn->flags & CO_FL_SESS_IDLE)
s->sess->idle_conns--;
session_unown_conn(s->sess, old_conn);
old_conn->owner = sess;
if (!session_add_conn(sess, old_conn, old_conn->target)) {
old_conn->flags &= ~CO_FL_SESS_IDLE;
old_conn->owner = NULL;
old_conn->mux->destroy(old_conn->ctx);
} else
session_check_idle_conn(sess, old_conn);
}
}
}
if (reuse) {
if (srv_conn->mux) {
int avail = srv_conn->mux->avail_streams(srv_conn);
@ -1318,10 +1275,9 @@ int connect_server(struct stream *s)
if (avail >= 1) {
srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
if (srv_cs) {
alloced_cs = 1;
if (srv_cs)
si_attach_cs(&s->si[1], srv_cs);
} else
else
srv_conn = NULL;
}
else
@ -1340,24 +1296,6 @@ int connect_server(struct stream *s)
srv_cs = NULL;
}
if (srv_conn && old_conn != srv_conn) {
if (srv_conn->owner)
session_unown_conn(srv_conn->owner, srv_conn);
srv_conn->owner = s->sess;
if (!session_add_conn(s->sess, srv_conn, srv_conn->target)) {
/* If we failed to attach the connection, detach the
* conn_stream, possibly destroying the connection */
if (alloced_cs)
si_release_endpoint(&s->si[1]);
srv_conn->owner = NULL;
if (srv_conn->mux && !srv_add_to_idle_list(objt_server(srv_conn->target), srv_conn))
/* The server doesn't want it, let's kill the connection right away */
srv_conn->mux->destroy(srv_conn->ctx);
srv_conn = NULL;
}
}
if (!srv_conn || !sockaddr_alloc(&srv_conn->dst))
return SF_ERR_RESOURCE;

41
src/mux_fcgi.c
View File

@ -3476,46 +3476,37 @@ static void fcgi_detach(struct conn_stream *cs)
if (!(fconn->conn->flags & (CO_FL_ERROR|CO_FL_SOCK_RD_SH|CO_FL_SOCK_WR_SH)) &&
!(fconn->flags & FCGI_CF_KEEP_CONN)) {
if (!fconn->conn->owner) {
/* Never ever allow to reuse a connection from a non-reuse backend */
if ((fconn->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
fconn->conn->flags |= CO_FL_PRIVATE;
if (!fconn->conn->owner && (fconn->conn->flags & CO_FL_PRIVATE)) {
fconn->conn->owner = sess;
if (!session_add_conn(sess, fconn->conn, fconn->conn->target)) {
fconn->conn->owner = NULL;
if (eb_is_empty(&fconn->streams_by_id)) {
if (!srv_add_to_idle_list(objt_server(fconn->conn->target), fconn->conn)) {
/* The server doesn't want it, let's kill the connection right away */
fconn->conn->mux->destroy(fconn);
TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
}
TRACE_DEVEL("reusable idle connection", FCGI_EV_STRM_END, fconn->conn);
return;
/* let's kill the connection right away */
fconn->conn->mux->destroy(fconn);
TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
}
}
}
if (eb_is_empty(&fconn->streams_by_id)) {
int ret = session_check_idle_conn(fconn->conn->owner, fconn->conn);
if (ret == -1) {
if (sess && fconn->conn->owner == sess &&
session_check_idle_conn(fconn->conn->owner, fconn->conn) != 0) {
/* The connection is destroyed, let's leave */
TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
return;
}
else if (ret == 1) {
/* The connection was added to the server idle list, just stop */
if (!(fconn->conn->flags & CO_FL_PRIVATE)) {
if (!srv_add_to_idle_list(objt_server(fconn->conn->target), fconn->conn)) {
/* The server doesn't want it, let's kill the connection right away */
fconn->conn->mux->destroy(fconn);
TRACE_DEVEL("outgoing connection killed", FCGI_EV_STRM_END|FCGI_EV_FCONN_ERR);
return;
}
TRACE_DEVEL("reusable idle connection", FCGI_EV_STRM_END, fconn->conn);
return;
}
TRACE_DEVEL("connection in idle session list", FCGI_EV_STRM_END, fconn->conn);
}
/* Never ever allow to reuse a connection from a non-reuse backend */
if ((fconn->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
fconn->conn->flags |= CO_FL_PRIVATE;
if (!LIST_ADDED(&fconn->conn->list) && fconn->nb_streams < fconn->streams_limit) {
struct server *srv = objt_server(fconn->conn->target);
if (srv) {
if (!(fconn->conn->flags & CO_FL_PRIVATE))
LIST_ADD(&srv->idle_conns[tid], &fconn->conn->list);
}
TRACE_DEVEL("connection in idle server list", FCGI_EV_STRM_END, fconn->conn);
}
}

51
src/mux_h1.c
View File

@ -2360,7 +2360,9 @@ static void h1_detach(struct conn_stream *cs)
struct h1s *h1s = cs->ctx;
struct h1c *h1c;
struct session *sess;
#if 0
int is_not_first;
#endif
TRACE_ENTER(H1_EV_STRM_END, h1s ? h1s->h1c->conn : NULL, h1s);
@ -2374,7 +2376,9 @@ static void h1_detach(struct conn_stream *cs)
h1c = h1s->h1c;
h1s->cs = NULL;
#if 0
is_not_first = h1s->flags & H1S_F_NOT_FIRST;
#endif
h1s_destroy(h1s);
if (conn_is_back(h1c->conn) && (h1c->flags & H1C_F_CS_IDLE)) {
@ -2395,51 +2399,30 @@ static void h1_detach(struct conn_stream *cs)
if ((h1c->px->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
h1c->conn->flags |= CO_FL_PRIVATE;
if (!(h1c->conn->owner)) {
if (!(h1c->conn->owner) && (h1c->conn->flags & CO_FL_PRIVATE)) {
h1c->conn->owner = sess;
if (!session_add_conn(sess, h1c->conn, h1c->conn->target)) {
h1c->conn->owner = NULL;
if (!srv_add_to_idle_list(objt_server(h1c->conn->target), h1c->conn)) {
/* The server doesn't want it, let's kill the connection right away */
h1c->conn->mux->destroy(h1c);
TRACE_DEVEL("outgoing connection killed", H1_EV_STRM_END|H1_EV_H1C_END);
goto end;
}
h1c->conn->xprt->subscribe(h1c->conn, h1c->conn->xprt_ctx, SUB_RETRY_RECV, &h1c->wait_event);
TRACE_DEVEL("reusable idle connection", H1_EV_STRM_END, h1c->conn);
h1c->conn->mux->destroy(h1c);
goto end;
}
}
if (h1c->conn->owner == sess) {
int ret = session_check_idle_conn(sess, h1c->conn);
if (ret == -1) {
if (session_check_idle_conn(sess, h1c->conn)) {
/* The connection got destroyed, let's leave */
TRACE_DEVEL("outgoing connection killed", H1_EV_STRM_END|H1_EV_H1C_END);
goto end;
}
else if (ret == 1) {
/* The connection was added to the server list,
* wake the task so we can subscribe to events
*/
h1c->conn->xprt->subscribe(h1c->conn, h1c->conn->xprt_ctx, SUB_RETRY_RECV, &h1c->wait_event);
TRACE_DEVEL("reusable idle connection", H1_EV_STRM_END, h1c->conn);
}
if (!(h1c->conn->flags & CO_FL_PRIVATE)) {
if (h1c->conn->owner == sess)
h1c->conn->owner = NULL;
if (!srv_add_to_idle_list(objt_server(h1c->conn->target), h1c->conn)) {
/* The server doesn't want it, let's kill the connection right away */
h1c->conn->mux->destroy(h1c);
TRACE_DEVEL("outgoing connection killed", H1_EV_STRM_END|H1_EV_H1C_END);
goto end;
}
TRACE_DEVEL("connection in idle session list", H1_EV_STRM_END, h1c->conn);
}
/* we're in keep-alive with an idle connection, monitor it if not already done */
if (LIST_ISEMPTY(&h1c->conn->list)) {
struct server *srv = objt_server(h1c->conn->target);
if (srv) {
if (!(h1c->conn->flags & CO_FL_PRIVATE)) {
if (is_not_first)
LIST_ADD(&srv->safe_conns[tid], &h1c->conn->list);
else
LIST_ADD(&srv->idle_conns[tid], &h1c->conn->list);
}
TRACE_DEVEL("connection in idle server list", H1_EV_STRM_END, h1c->conn);
}
h1c->conn->xprt->subscribe(h1c->conn, h1c->conn->xprt_ctx, SUB_RETRY_RECV, &h1c->wait_event);
return;
}
}

31
src/mux_h2.c
View File

@ -3874,37 +3874,38 @@ static void h2_detach(struct conn_stream *cs)
if (h2c->flags & H2_CF_IS_BACK) {
if (!(h2c->conn->flags &
(CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
if (!h2c->conn->owner) {
/* Never ever allow to reuse a connection from a non-reuse backend */
if ((h2c->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
h2c->conn->flags |= CO_FL_PRIVATE;
if (!h2c->conn->owner && (h2c->conn->flags & CO_FL_PRIVATE)) {
h2c->conn->owner = sess;
if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
h2c->conn->owner = NULL;
if (eb_is_empty(&h2c->streams_by_id)) {
if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn))
/* The server doesn't want it, let's kill the connection right away */
h2c->conn->mux->destroy(h2c);
h2c->conn->mux->destroy(h2c);
TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
return;
}
}
}
if (eb_is_empty(&h2c->streams_by_id)) {
if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
if (sess && h2c->conn->owner == sess &&
session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
/* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
return;
}
}
/* Never ever allow to reuse a connection from a non-reuse backend */
if ((h2c->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
h2c->conn->flags |= CO_FL_PRIVATE;
if (!LIST_ADDED(&h2c->conn->list) && h2c->nb_streams < h2c->streams_limit) {
struct server *srv = objt_server(h2c->conn->target);
if (!(h2c->conn->flags & CO_FL_PRIVATE)) {
if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn)) {
/* The server doesn't want it, let's kill the connection right away */
h2c->conn->mux->destroy(h2c);
TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
return;
}
TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
return;
if (srv) {
if (!(h2c->conn->flags & CO_FL_PRIVATE))
LIST_ADD(&srv->idle_conns[tid], &h2c->conn->list);
}
}
}
}

3
src/session.c
View File

@ -82,8 +82,7 @@ void session_free(struct session *sess)
if (conn->mux) {
conn->owner = NULL;
conn->flags &= ~CO_FL_SESS_IDLE;
if (!srv_add_to_idle_list(objt_server(conn->target), conn))
conn->mux->destroy(conn->ctx);
conn->mux->destroy(conn->ctx);
} else {
/* We have a connection, but not yet an associated mux.
* So destroy it now.