haproxy/include/proto/stream_interface.h

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[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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/*
* include/proto/stream_interface.h
* This file contains stream_interface function prototypes
*
* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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#ifndef _PROTO_STREAM_INTERFACE_H
#define _PROTO_STREAM_INTERFACE_H
#include <stdlib.h>
#include <common/config.h>
#include <types/session.h>
[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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#include <types/stream_interface.h>
/* main event functions used to move data between sockets and buffers */
int stream_int_check_timeouts(struct stream_interface *si);
[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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void stream_int_report_error(struct stream_interface *si);
void stream_int_retnclose(struct stream_interface *si, const struct chunk *msg);
int conn_si_send_proxy(struct connection *conn, unsigned int flag);
void stream_sock_update_conn(struct connection *conn);
int stream_int_shutr(struct stream_interface *si);
int stream_int_shutw(struct stream_interface *si);
[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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extern struct sock_ops stream_int_embedded;
extern struct sock_ops stream_int_task;
struct task *stream_int_register_handler(struct stream_interface *si,
struct si_applet *app);
struct task *stream_int_register_handler_task(struct stream_interface *si,
struct task *(*fct)(struct task *));
void stream_int_unregister_handler(struct stream_interface *si);
static inline const struct protocol *si_ctrl(struct stream_interface *si)
{
return si->conn.ctrl;
}
static inline const struct sock_ops *si_data(struct stream_interface *si)
{
return si->conn.data;
}
static inline int si_fd(struct stream_interface *si)
{
return si->conn.t.sock.fd;
}
static inline void clear_target(struct target *dest)
{
dest->type = TARG_TYPE_NONE;
dest->ptr.v = NULL;
}
static inline void set_target_client(struct target *dest, struct listener *l)
{
dest->type = TARG_TYPE_CLIENT;
dest->ptr.l = l;
}
static inline void set_target_server(struct target *dest, struct server *s)
{
dest->type = TARG_TYPE_SERVER;
dest->ptr.s = s;
}
static inline void set_target_proxy(struct target *dest, struct proxy *p)
{
dest->type = TARG_TYPE_PROXY;
dest->ptr.p = p;
}
static inline void set_target_applet(struct target *dest, struct si_applet *a)
{
dest->type = TARG_TYPE_APPLET;
dest->ptr.a = a;
}
static inline void set_target_task(struct target *dest, struct task *t)
{
dest->type = TARG_TYPE_TASK;
dest->ptr.t = t;
}
static inline struct target *copy_target(struct target *dest, struct target *src)
{
*dest = *src;
return dest;
}
static inline int target_match(struct target *a, struct target *b)
{
return a->type == b->type && a->ptr.v == b->ptr.v;
}
static inline struct server *target_srv(struct target *t)
{
if (!t || t->type != TARG_TYPE_SERVER)
return NULL;
return t->ptr.s;
}
static inline struct listener *target_client(struct target *t)
{
if (!t || t->type != TARG_TYPE_CLIENT)
return NULL;
return t->ptr.l;
}
static inline void stream_interface_prepare(struct stream_interface *si, const struct sock_ops *ops)
{
si->conn.data = ops;
si->conn.data_st = 0;
si->conn.data_ctx = NULL;
}
/* Retrieves the source address for the stream interface. */
static inline void si_get_from_addr(struct stream_interface *si)
{
if (si->flags & SI_FL_FROM_SET)
return;
if (!si_ctrl(si) || !si_ctrl(si)->get_src)
return;
if (si_ctrl(si)->get_src(si_fd(si), (struct sockaddr *)&si->addr.from,
sizeof(si->addr.from),
si->target.type != TARG_TYPE_CLIENT) == -1)
return;
si->flags |= SI_FL_FROM_SET;
}
/* Retrieves the original destination address for the stream interface. */
static inline void si_get_to_addr(struct stream_interface *si)
{
if (si->flags & SI_FL_TO_SET)
return;
if (!si_ctrl(si) || !si_ctrl(si)->get_dst)
return;
if (si_ctrl(si)->get_dst(si_fd(si), (struct sockaddr *)&si->addr.to,
sizeof(si->addr.to),
si->target.type != TARG_TYPE_CLIENT) == -1)
return;
si->flags |= SI_FL_TO_SET;
}
/* Sends a shutr to the connection using the data layer */
static inline void si_shutr(struct stream_interface *si)
{
if (stream_int_shutr(si))
fd_stop_recv(si_fd(si));
}
/* Sends a shutw to the connection using the data layer */
static inline void si_shutw(struct stream_interface *si)
{
if (stream_int_shutw(si))
fd_stop_send(si_fd(si));
}
/* Calls the data state update on the stream interfaace */
static inline void si_update(struct stream_interface *si)
{
si_data(si)->update(si);
}
/* Calls chk_rcv on the connection using the data layer */
static inline void si_chk_rcv(struct stream_interface *si)
{
si_data(si)->chk_rcv(si);
}
/* Calls chk_snd on the connection using the data layer */
static inline void si_chk_snd(struct stream_interface *si)
{
si_data(si)->chk_snd(si);
}
/* Calls chk_snd on the connection using the ctrl layer */
static inline int si_connect(struct stream_interface *si)
{
if (unlikely(!si_ctrl(si) || !si_ctrl(si)->connect))
return SN_ERR_INTERNAL;
return si_ctrl(si)->connect(si);
}
[MAJOR] add a connection error state to the stream_interface Tracking connection status changes was hard, and some code was redundant. A new SI_ST_CER state was added to the stream interface to indicate a past connection error, and an SI_FL_ERR flag was added to report past I/O error. The stream_sock code does not set the connection to SI_ST_CLO anymore in case of I/O error, it's the upper layer which does it. This makes it possible to know exactly when the file descriptors are allocated. The new SI_ST_CER state permitted to split tcp_connection_status() in two parts, one processing SI_ST_CON and the other one SI_ST_CER. Synchronous connection errors now make use of this last state, hence eliminating duplicate code. Some ib<->ob copy paste errors were found and fixed, and all entities setting SI_ST_CLO also shut the buffers down. Some of these stream_interface specific functions and structures have migrated to a new stream_interface.c file. Some types of errors are still not detected by the buffers. For instance, let's assume the following scenario in one single pass of process_session: a connection sits in SI_ST_TAR state during a retry. At TAR expiration, a new connection attempt is made, the connection is obtained and srv->cur_sess is increased. Then the buffer timeout is fires and everything is cleared, the new state becomes SI_ST_CLO. The cleaning code checks that previous state was either SI_ST_CON or SI_ST_EST to release the connection. But that's wrong because last state is still SI_ST_TAR. So the server's connection count does not get decreased. This means that prev_state must not be used, and must be replaced by some transition detection instead of level detection. The following debugging line was useful to track state changes : fprintf(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__, s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s-> rep->flags);
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#endif /* _PROTO_STREAM_INTERFACE_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/