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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);
2008-11-03 05:26:53 +00:00
/*
[MINOR] http: remove the last call to stream_int_return And remove the now unused function itself too.
2009-10-18 21:56:35 +00:00
* include/proto/stream_interface.h
* This file contains stream_interface function prototypes
*
CLEANUP: stream_interface: stop exporting socket layer functions Similarly to the previous patch, we don't need the socket-layer functions outside of stream_interface. They could even move to a file dedicated to applets, though that does not seem particularly useful at the moment.
2012-05-11 15:47:17 +00:00
* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
[MINOR] http: remove the last call to stream_int_return And remove the now unused function itself too.
2009-10-18 21:56:35 +00:00
*
* 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);
2008-11-03 05:26:53 +00:00
#ifndef _PROTO_STREAM_INTERFACE_H
#define _PROTO_STREAM_INTERFACE_H
#include <stdlib.h>
#include <common/config.h>
#include <types/stream_interface.h>
/* main event functions used to move data between sockets and buffers */
[BUILD] stream_interface: fix conflicting declaration stream_int_check_timeouts was declared void while it's an int.
2009-09-20 18:14:49 +00:00
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);
2008-11-03 05:26:53 +00:00
void stream_int_report_error(struct stream_interface *si);
[MINOR] replace client_retnclose() with stream_int_retnclose() This makes more sense to return a message to a stream interface than to a session. senddata.{c,h} have been removed.
2008-11-30 18:48:07 +00:00
void stream_int_retnclose(struct stream_interface *si, const struct chunk *msg);
[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);
2008-11-03 05:26:53 +00:00
REORG/MEDIUM: stream_interface: initialize socket ops from descriptors
2012-05-07 15:15:39 +00:00
extern struct sock_ops stream_int_embedded;
extern struct sock_ops stream_int_task;
[MINOR] stream_interface: add functions to support running as internal/external tasks It will soon be necessary to have stream interfaces running as part of the current task, or as independant tasks. For instance when we want to implement compression or SSL. It will also be used for applets running as stream interfaces. These new functions are used to perform exactly that. Note that it's still not easy to write a simple echo applet and more functions will likely be needed.
2009-09-05 18:57:35 +00:00
struct task *stream_int_register_handler(struct stream_interface *si,
[MINOR] stream_interface: make use of an applet descriptor for IO handlers I/O handlers are still delicate to manipulate. They have no type, they're just raw functions which have no knowledge of themselves. Let's have them declared as applets once for all. That way we can have multiple applets share the same handler functions and we can store their names there. When we later need to add more parameters (eg: usage stats), we'll be able to do so in the applets themselves. The CLI functions has been prefixed with "cli" instead of "stats" as it's clearly what is going on there. The applet descriptor in the stream interface should get all the applet specific data (st0, ...) but this will be done in the next patch so that we don't pollute this one too much.
2011-02-13 12:16:36 +00:00
struct si_applet *app);
[MINOR] stream_interface: add functions to support running as internal/external tasks It will soon be necessary to have stream interfaces running as part of the current task, or as independant tasks. For instance when we want to implement compression or SSL. It will also be used for applets running as stream interfaces. These new functions are used to perform exactly that. Note that it's still not easy to write a simple echo applet and more functions will likely be needed.
2009-09-05 18:57:35 +00:00
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);
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
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;
}
[CLEANUP] stream_interface: use inline functions to manipulate targets The connection target involves a type and a union of pointers, let's make the code cleaner using simple wrappers.
2011-03-10 13:03:36 +00:00
static inline void clear_target(struct target *dest)
{
dest->type = TARG_TYPE_NONE;
dest->ptr.v = NULL;
}
MINOR: stream_interface: add a client target : TARG_TYPE_CLIENT This one will be used to identify the direction the SI is being used. All incoming connections have a target of type TARG_TYPE_CLIENT.
2012-05-11 12:47:34 +00:00
static inline void set_target_client(struct target *dest)
{
dest->type = TARG_TYPE_CLIENT;
dest->ptr.v = NULL;
}
[CLEANUP] stream_interface: use inline functions to manipulate targets The connection target involves a type and a union of pointers, let's make the code cleaner using simple wrappers.
2011-03-10 13:03:36 +00:00
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;
}
[MAJOR] session: remove the ->srv pointer from struct session This one has been removed and is now totally superseded by ->target. To get the server, one must use target_srv(&s->target) instead of s->srv now. The function ensures that non-server targets still return NULL.
2011-03-10 15:55:02 +00:00
static inline struct server *target_srv(struct target *t)
{
if (!t || t->type != TARG_TYPE_SERVER)
return NULL;
return t->ptr.s;
}
REORG/MEDIUM: stream_interface: initialize socket ops from descriptors
2012-05-07 15:15:39 +00:00
static inline void stream_interface_prepare(struct stream_interface *si, const struct sock_ops *ops)
{
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
si->conn.data = ops;
REORG/MEDIUM: stream_interface: initialize socket ops from descriptors
2012-05-07 15:15:39 +00:00
}
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
/* 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;
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
if (!si_ctrl(si) || !si_ctrl(si)->get_src)
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
return;
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
if (si_ctrl(si)->get_src(si->fd, (struct sockaddr *)&si->addr.from,
sizeof(si->addr.from),
si->target.type != TARG_TYPE_CLIENT) == -1)
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
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;
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
if (!si_ctrl(si) || !si_ctrl(si)->get_dst)
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
return;
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
if (si_ctrl(si)->get_dst(si->fd, (struct sockaddr *)&si->addr.to,
sizeof(si->addr.to),
si->target.type != TARG_TYPE_CLIENT) == -1)
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
return;
si->flags |= SI_FL_TO_SET;
}
MINOR: stream_interface: introduce a new "struct connection" type We start to move everything needed to manage a connection to a special entity "struct connection". We have the data layer operations and the control operations there. We'll also have more info in the future such as file descriptors and applet contexts, so that in the end it becomes detachable from the stream interface, which will allow connections to be reused between sessions. For now on, we start with minimal changes.
2012-05-21 14:31:45 +00:00
/* Sends a shutr to the connection using the data layer */
static inline void si_shutr(struct stream_interface *si)
{
si_data(si)->shutr(si);
}
/* Sends a shutw to the connection using the data layer */
static inline void si_shutw(struct stream_interface *si)
{
si_data(si)->shutw(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);
}
BUG/MEDIUM: stream_interface: restore get_src/get_dst Commit e164e7a removed get_src/get_dst setting in the stream interfaces but forgot to set it in proto_tcp. Get the feature back because we need it for logging, transparent mode, ACLs etc... We now rely on the stream interface direction to know what syscall to use. One benefit of doing it this way is that we don't use getsockopt() anymore on outgoing stream interfaces nor on UNIX sockets.
2012-05-11 14:16:40 +00:00
[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);
2008-11-03 05:26:53 +00:00
#endif /* _PROTO_STREAM_INTERFACE_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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