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haproxy/src/peers.c
Joseph Herlant 82b2f54d4c CLEANUP: Fix typos in the peers subsystem 
Fix some typos in the code comments of the peers subsystem.
2018-11-18 22:26:42 +01:00

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/*
* Peer synchro management.
*
* Copyright 2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/time.h>
#include <common/standard.h>
#include <common/hathreads.h>
#include <types/global.h>
#include <types/listener.h>
#include <types/obj_type.h>
#include <types/peers.h>
#include <proto/acl.h>
#include <proto/applet.h>
#include <proto/channel.h>
#include <proto/fd.h>
#include <proto/frontend.h>
#include <proto/log.h>
#include <proto/hdr_idx.h>
#include <proto/mux_pt.h>
#include <proto/proxy.h>
#include <proto/session.h>
#include <proto/stream.h>
#include <proto/signal.h>
#include <proto/stick_table.h>
#include <proto/stream_interface.h>
#include <proto/task.h>
/*******************************/
/* Current peer learning state */
/*******************************/
/******************************/
/* Current peers section resync state */
/******************************/
#define PEERS_F_RESYNC_LOCAL 0x00000001 /* Learn from local finished or no more needed */
#define PEERS_F_RESYNC_REMOTE 0x00000002 /* Learn from remote finished or no more needed */
#define PEERS_F_RESYNC_ASSIGN 0x00000004 /* A peer was assigned to learn our lesson */
#define PEERS_F_RESYNC_PROCESS 0x00000008 /* The assigned peer was requested for resync */
#define PEERS_F_DONOTSTOP 0x00010000 /* Main table sync task block process during soft stop
to push data to new process */
#define PEERS_RESYNC_STATEMASK (PEERS_F_RESYNC_LOCAL|PEERS_F_RESYNC_REMOTE)
#define PEERS_RESYNC_FROMLOCAL 0x00000000
#define PEERS_RESYNC_FROMREMOTE PEERS_F_RESYNC_LOCAL
#define PEERS_RESYNC_FINISHED (PEERS_F_RESYNC_LOCAL|PEERS_F_RESYNC_REMOTE)
/***********************************/
/* Current shared table sync state */
/***********************************/
#define SHTABLE_F_TEACH_STAGE1 0x00000001 /* Teach state 1 complete */
#define SHTABLE_F_TEACH_STAGE2 0x00000002 /* Teach state 2 complete */
/******************************/
/* Remote peer teaching state */
/******************************/
#define PEER_F_TEACH_PROCESS 0x00000001 /* Teach a lesson to current peer */
#define PEER_F_TEACH_FINISHED 0x00000008 /* Teach conclude, (wait for confirm) */
#define PEER_F_TEACH_COMPLETE 0x00000010 /* All that we know already taught to current peer, used only for a local peer */
#define PEER_F_LEARN_ASSIGN 0x00000100 /* Current peer was assigned for a lesson */
#define PEER_F_LEARN_NOTUP2DATE 0x00000200 /* Learn from peer finished but peer is not up to date */
#define PEER_F_DWNGRD 0x80000000 /* When this flag is enabled, we must downgrade the supported version announced during peer sessions. */
#define PEER_TEACH_RESET ~(PEER_F_TEACH_PROCESS|PEER_F_TEACH_FINISHED) /* PEER_F_TEACH_COMPLETE should never be reset */
#define PEER_LEARN_RESET ~(PEER_F_LEARN_ASSIGN|PEER_F_LEARN_NOTUP2DATE)
/*****************************/
/* Sync message class */
/*****************************/
enum {
PEER_MSG_CLASS_CONTROL = 0,
PEER_MSG_CLASS_ERROR,
PEER_MSG_CLASS_STICKTABLE = 10,
PEER_MSG_CLASS_RESERVED = 255,
};
/*****************************/
/* control message types */
/*****************************/
enum {
PEER_MSG_CTRL_RESYNCREQ = 0,
PEER_MSG_CTRL_RESYNCFINISHED,
PEER_MSG_CTRL_RESYNCPARTIAL,
PEER_MSG_CTRL_RESYNCCONFIRM,
};
/*****************************/
/* error message types */
/*****************************/
enum {
PEER_MSG_ERR_PROTOCOL = 0,
PEER_MSG_ERR_SIZELIMIT,
};
/*******************************/
/* stick table sync mesg types */
/* Note: ids >= 128 contains */
/* id message cotains data */
/*******************************/
#define PEER_MSG_STKT_UPDATE 0x80
#define PEER_MSG_STKT_INCUPDATE 0x81
#define PEER_MSG_STKT_DEFINE 0x82
#define PEER_MSG_STKT_SWITCH 0x83
#define PEER_MSG_STKT_ACK 0x84
#define PEER_MSG_STKT_UPDATE_TIMED 0x85
#define PEER_MSG_STKT_INCUPDATE_TIMED 0x86
/**********************************/
/* Peer Session IO handler states */
/**********************************/
enum {
PEER_SESS_ST_ACCEPT = 0, /* Initial state for session create by an accept, must be zero! */
PEER_SESS_ST_GETVERSION, /* Validate supported protocol version */
PEER_SESS_ST_GETHOST, /* Validate host ID correspond to local host id */
PEER_SESS_ST_GETPEER, /* Validate peer ID correspond to a known remote peer id */
/* after this point, data were possibly exchanged */
PEER_SESS_ST_SENDSUCCESS, /* Send ret code 200 (success) and wait for message */
PEER_SESS_ST_CONNECT, /* Initial state for session create on a connect, push presentation into buffer */
PEER_SESS_ST_GETSTATUS, /* Wait for the welcome message */
PEER_SESS_ST_WAITMSG, /* Wait for data messages */
PEER_SESS_ST_EXIT, /* Exit with status code */
PEER_SESS_ST_ERRPROTO, /* Send error proto message before exit */
PEER_SESS_ST_ERRSIZE, /* Send error size message before exit */
PEER_SESS_ST_END, /* Killed session */
};
/***************************************************/
/* Peer Session status code - part of the protocol */
/***************************************************/
#define PEER_SESS_SC_CONNECTCODE 100 /* connect in progress */
#define PEER_SESS_SC_CONNECTEDCODE 110 /* tcp connect success */
#define PEER_SESS_SC_SUCCESSCODE 200 /* accept or connect successful */
#define PEER_SESS_SC_TRYAGAIN 300 /* try again later */
#define PEER_SESS_SC_ERRPROTO 501 /* error protocol */
#define PEER_SESS_SC_ERRVERSION 502 /* unknown protocol version */
#define PEER_SESS_SC_ERRHOST 503 /* bad host name */
#define PEER_SESS_SC_ERRPEER 504 /* unknown peer */
#define PEER_SESSION_PROTO_NAME "HAProxyS"
#define PEER_MAJOR_VER 2
#define PEER_MINOR_VER 1
#define PEER_DWNGRD_MINOR_VER 0
struct peers *cfg_peers = NULL;
static void peer_session_forceshutdown(struct appctx *appctx);
/* This function encode an uint64 to 'dynamic' length format.
The encoded value is written at address *str, and the
caller must assure that size after *str is large enought.
At return, the *str is set at the next Byte after then
encoded integer. The function returns then length of the
encoded integer in Bytes */
int intencode(uint64_t i, char **str) {
int idx = 0;
unsigned char *msg;
if (!*str)
return 0;
msg = (unsigned char *)*str;
if (i < 240) {
msg[0] = (unsigned char)i;
*str = (char *)&msg[idx+1];
return (idx+1);
}
msg[idx] =(unsigned char)i | 240;
i = (i - 240) >> 4;
while (i >= 128) {
msg[++idx] = (unsigned char)i | 128;
i = (i - 128) >> 7;
}
msg[++idx] = (unsigned char)i;
*str = (char *)&msg[idx+1];
return (idx+1);
}
/* This function returns the decoded integer or 0
if decode failed
*str point on the beginning of the integer to decode
at the end of decoding *str point on the end of the
encoded integer or to null if end is reached */
uint64_t intdecode(char **str, char *end)
{
unsigned char *msg;
uint64_t i;
int shift;
if (!*str)
return 0;
msg = (unsigned char *)*str;
if (msg >= (unsigned char *)end)
goto fail;
i = *(msg++);
if (i >= 240) {
shift = 4;
do {
if (msg >= (unsigned char *)end)
goto fail;
i += (uint64_t)*msg << shift;
shift += 7;
} while (*(msg++) >= 128);
}
*str = (char *)msg;
return i;
fail:
*str = NULL;
return 0;
}
/* Set the stick-table UPDATE message type byte at <msg_type> address,
* depending on <use_identifier> and <use_timed> boolean parameters.
* Always successful.
*/
static inline void peer_set_update_msg_type(char *msg_type, int use_identifier, int use_timed)
{
if (use_timed) {
if (use_identifier)
*msg_type = PEER_MSG_STKT_UPDATE_TIMED;
else
*msg_type = PEER_MSG_STKT_INCUPDATE_TIMED;
}
else {
if (use_identifier)
*msg_type = PEER_MSG_STKT_UPDATE;
else
*msg_type = PEER_MSG_STKT_INCUPDATE;
}
}
/*
* This prepare the data update message on the stick session <ts>, <st> is the considered
* stick table.
* <msg> is a buffer of <size> to receive data message content
* If function returns 0, the caller should consider we were unable to encode this message (TODO:
* check size)
*/
static int peer_prepare_updatemsg(struct stksess *ts, struct shared_table *st, unsigned int updateid, char *msg, size_t size, int use_identifier, int use_timed)
{
uint32_t netinteger;
unsigned short datalen;
char *cursor, *datamsg;
unsigned int data_type;
void *data_ptr;
cursor = datamsg = msg + 1 + 5;
/* construct message */
/* check if we need to send the update identifer */
if (!st->last_pushed || updateid < st->last_pushed || ((updateid - st->last_pushed) != 1)) {
use_identifier = 1;
}
/* encode update identifier if needed */
if (use_identifier) {
netinteger = htonl(updateid);
memcpy(cursor, &netinteger, sizeof(netinteger));
cursor += sizeof(netinteger);
}
if (use_timed) {
netinteger = htonl(tick_remain(now_ms, ts->expire));
memcpy(cursor, &netinteger, sizeof(netinteger));
cursor += sizeof(netinteger);
}
/* encode the key */
if (st->table->type == SMP_T_STR) {
int stlen = strlen((char *)ts->key.key);
intencode(stlen, &cursor);
memcpy(cursor, ts->key.key, stlen);
cursor += stlen;
}
else if (st->table->type == SMP_T_SINT) {
netinteger = htonl(*((uint32_t *)ts->key.key));
memcpy(cursor, &netinteger, sizeof(netinteger));
cursor += sizeof(netinteger);
}
else {
memcpy(cursor, ts->key.key, st->table->key_size);
cursor += st->table->key_size;
}
HA_RWLOCK_RDLOCK(STK_SESS_LOCK, &ts->lock);
/* encode values */
for (data_type = 0 ; data_type < STKTABLE_DATA_TYPES ; data_type++) {
data_ptr = stktable_data_ptr(st->table, ts, data_type);
if (data_ptr) {
switch (stktable_data_types[data_type].std_type) {
case STD_T_SINT: {
int data;
data = stktable_data_cast(data_ptr, std_t_sint);
intencode(data, &cursor);
break;
}
case STD_T_UINT: {
unsigned int data;
data = stktable_data_cast(data_ptr, std_t_uint);
intencode(data, &cursor);
break;
}
case STD_T_ULL: {
unsigned long long data;
data = stktable_data_cast(data_ptr, std_t_ull);
intencode(data, &cursor);
break;
}
case STD_T_FRQP: {
struct freq_ctr_period *frqp;
frqp = &stktable_data_cast(data_ptr, std_t_frqp);
intencode((unsigned int)(now_ms - frqp->curr_tick), &cursor);
intencode(frqp->curr_ctr, &cursor);
intencode(frqp->prev_ctr, &cursor);
break;
}
}
}
}
HA_RWLOCK_RDUNLOCK(STK_SESS_LOCK, &ts->lock);
/* Compute datalen */
datalen = (cursor - datamsg);
/* prepare message header */
msg[0] = PEER_MSG_CLASS_STICKTABLE;
peer_set_update_msg_type(&msg[1], use_identifier, use_timed);
cursor = &msg[2];
intencode(datalen, &cursor);
/* move data after header */
memmove(cursor, datamsg, datalen);
/* return header size + data_len */
return (cursor - msg) + datalen;
}
/*
* This prepare the switch table message to targeted share table <st>.
* <msg> is a buffer of <size> to receive data message content
* If function returns 0, the caller should consider we were unable to encode this message (TODO:
* check size)
*/
static int peer_prepare_switchmsg(struct shared_table *st, char *msg, size_t size)
{
int len;
unsigned short datalen;
struct buffer *chunk;
char *cursor, *datamsg, *chunkp, *chunkq;
uint64_t data = 0;
unsigned int data_type;
cursor = datamsg = msg + 2 + 5;
/* Encode data */
/* encode local id */
intencode(st->local_id, &cursor);
/* encode table name */
len = strlen(st->table->id);
intencode(len, &cursor);
memcpy(cursor, st->table->id, len);
cursor += len;
/* encode table type */
intencode(st->table->type, &cursor);
/* encode table key size */
intencode(st->table->key_size, &cursor);
chunk = get_trash_chunk();
chunkp = chunkq = chunk->area;
/* encode available known data types in table */
for (data_type = 0 ; data_type < STKTABLE_DATA_TYPES ; data_type++) {
if (st->table->data_ofs[data_type]) {
switch (stktable_data_types[data_type].std_type) {
case STD_T_SINT:
case STD_T_UINT:
case STD_T_ULL:
data |= 1 << data_type;
break;
case STD_T_FRQP:
data |= 1 << data_type;
intencode(data_type, &chunkq);
intencode(st->table->data_arg[data_type].u, &chunkq);
break;
}
}
}
intencode(data, &cursor);
/* Encode stick-table entries duration. */
intencode(st->table->expire, &cursor);
if (chunkq > chunkp) {
chunk->data = chunkq - chunkp;
memcpy(cursor, chunk->area, chunk->data);
cursor += chunk->data;
}
/* Compute datalen */
datalen = (cursor - datamsg);
/* prepare message header */
msg[0] = PEER_MSG_CLASS_STICKTABLE;
msg[1] = PEER_MSG_STKT_DEFINE;
cursor = &msg[2];
intencode(datalen, &cursor);
/* move data after header */
memmove(cursor, datamsg, datalen);
/* return header size + data_len */
return (cursor - msg) + datalen;
}
/*
* This prepare the acknowledge message on the stick session <ts>, <st> is the considered
* stick table.
* <msg> is a buffer of <size> to receive data message content
* If function returns 0, the caller should consider we were unable to encode this message (TODO:
* check size)
*/
static int peer_prepare_ackmsg(struct shared_table *st, char *msg, size_t size)
{
unsigned short datalen;
char *cursor, *datamsg;
uint32_t netinteger;
cursor = datamsg = msg + 2 + 5;
intencode(st->remote_id, &cursor);
netinteger = htonl(st->last_get);
memcpy(cursor, &netinteger, sizeof(netinteger));
cursor += sizeof(netinteger);
/* Compute datalen */
datalen = (cursor - datamsg);
/* prepare message header */
msg[0] = PEER_MSG_CLASS_STICKTABLE;
msg[1] = PEER_MSG_STKT_ACK;
cursor = &msg[2];
intencode(datalen, &cursor);
/* move data after header */
memmove(cursor, datamsg, datalen);
/* return header size + data_len */
return (cursor - msg) + datalen;
}
/*
* Callback to release a session with a peer
*/
static void peer_session_release(struct appctx *appctx)
{
struct stream_interface *si = appctx->owner;
struct stream *s = si_strm(si);
struct peer *peer = appctx->ctx.peers.ptr;
struct peers *peers = strm_fe(s)->parent;
/* appctx->ctx.peers.ptr is not a peer session */
if (appctx->st0 < PEER_SESS_ST_SENDSUCCESS)
return;
/* peer session identified */
if (peer) {
if (appctx->st0 == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
HA_ATOMIC_SUB(&active_peers, 1);
HA_SPIN_LOCK(PEER_LOCK, &peer->lock);
if (peer->appctx == appctx) {
/* Re-init current table pointers to force announcement on re-connect */
peer->remote_table = peer->last_local_table = NULL;
peer->appctx = NULL;
if (peer->flags & PEER_F_LEARN_ASSIGN) {
/* unassign current peer for learning */
peer->flags &= ~(PEER_F_LEARN_ASSIGN);
peers->flags &= ~(PEERS_F_RESYNC_ASSIGN|PEERS_F_RESYNC_PROCESS);
/* reschedule a resync */
peers->resync_timeout = tick_add(now_ms, MS_TO_TICKS(5000));
}
/* reset teaching and learning flags to 0 */
peer->flags &= PEER_TEACH_RESET;
peer->flags &= PEER_LEARN_RESET;
}
HA_SPIN_UNLOCK(PEER_LOCK, &peer->lock);
task_wakeup(peers->sync_task, TASK_WOKEN_MSG);
}
}
/* Retrieve the major and minor versions of peers protocol
* announced by a remote peer. <str> is a null-terminated
* string with the following format: "<maj_ver>.<min_ver>".
*/
static int peer_get_version(const char *str,
unsigned int *maj_ver, unsigned int *min_ver)
{
unsigned int majv, minv;
const char *pos, *saved;
const char *end;
saved = pos = str;
end = str + strlen(str);
majv = read_uint(&pos, end);
if (saved == pos || *pos++ != '.')
return -1;
saved = pos;
minv = read_uint(&pos, end);
if (saved == pos || pos != end)
return -1;
*maj_ver = majv;
*min_ver = minv;
return 0;
}
/*
* IO Handler to handle message exchance with a peer
*/
static void peer_io_handler(struct appctx *appctx)
{
struct stream_interface *si = appctx->owner;
struct stream *s = si_strm(si);
struct peers *curpeers = strm_fe(s)->parent;
struct peer *curpeer = NULL;
int reql = 0;
int repl = 0;
size_t proto_len = strlen(PEER_SESSION_PROTO_NAME);
unsigned int maj_ver, min_ver;
int prev_state;
/* Check if the input buffer is available. */
if (si_ic(si)->buf.size == 0)
goto full;
while (1) {
prev_state = appctx->st0;
switchstate:
maj_ver = min_ver = (unsigned int)-1;
switch(appctx->st0) {
case PEER_SESS_ST_ACCEPT:
prev_state = appctx->st0;
appctx->ctx.peers.ptr = NULL;
appctx->st0 = PEER_SESS_ST_GETVERSION;
/* fall through */
case PEER_SESS_ST_GETVERSION:
prev_state = appctx->st0;
reql = co_getline(si_oc(si), trash.area,
trash.size);
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
goto out;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
if (trash.area[reql-1] != '\n') {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.area[reql-2] == '\r'))
trash.area[reql-2] = 0;
else
trash.area[reql-1] = 0;
co_skip(si_oc(si), reql);
/* test protocol */
if (strncmp(PEER_SESSION_PROTO_NAME " ", trash.area, proto_len + 1) != 0) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPROTO;
goto switchstate;
}
if (peer_get_version(trash.area + proto_len + 1, &maj_ver, &min_ver) == -1 ||
maj_ver != PEER_MAJOR_VER || min_ver > PEER_MINOR_VER) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRVERSION;
goto switchstate;
}
appctx->st0 = PEER_SESS_ST_GETHOST;
/* fall through */
case PEER_SESS_ST_GETHOST:
prev_state = appctx->st0;
reql = co_getline(si_oc(si), trash.area,
trash.size);
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
goto out;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
if (trash.area[reql-1] != '\n') {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.area[reql-2] == '\r'))
trash.area[reql-2] = 0;
else
trash.area[reql-1] = 0;
co_skip(si_oc(si), reql);
/* test hostname match */
if (strcmp(localpeer, trash.area) != 0) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRHOST;
goto switchstate;
}
appctx->st0 = PEER_SESS_ST_GETPEER;
/* fall through */
case PEER_SESS_ST_GETPEER: {
char *p;
prev_state = appctx->st0;
reql = co_getline(si_oc(si), trash.area,
trash.size);
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
goto out;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
if (trash.area[reql-1] != '\n') {
/* Incomplete line, we quit */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.area[reql-2] == '\r'))
trash.area[reql-2] = 0;
else
trash.area[reql-1] = 0;
co_skip(si_oc(si), reql);
/* parse line "<peer name> <pid> <relative_pid>" */
p = strchr(trash.area, ' ');
if (!p) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPROTO;
goto switchstate;
}
*p = 0;
/* lookup known peer */
for (curpeer = curpeers->remote; curpeer; curpeer = curpeer->next) {
if (strcmp(curpeer->id, trash.area) == 0)
break;
}
/* if unknown peer */
if (!curpeer) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPEER;
goto switchstate;
}
HA_SPIN_LOCK(PEER_LOCK, &curpeer->lock);
if (curpeer->appctx && curpeer->appctx != appctx) {
if (curpeer->local) {
/* Local connection, reply a retry */
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_TRYAGAIN;
goto switchstate;
}
/* we're killing a connection, we must apply a random delay before
* retrying otherwise the other end will do the same and we can loop
* for a while.
*/
curpeer->reconnect = tick_add(now_ms, MS_TO_TICKS(50 + random() % 2000));
peer_session_forceshutdown(curpeer->appctx);
}
if (maj_ver != (unsigned int)-1 && min_ver != (unsigned int)-1) {
if (min_ver == PEER_DWNGRD_MINOR_VER) {
curpeer->flags |= PEER_F_DWNGRD;
}
else {
curpeer->flags &= ~PEER_F_DWNGRD;
}
}
curpeer->appctx = appctx;
appctx->ctx.peers.ptr = curpeer;
appctx->st0 = PEER_SESS_ST_SENDSUCCESS;
HA_ATOMIC_ADD(&active_peers, 1);
/* fall through */
}
case PEER_SESS_ST_SENDSUCCESS: {
struct shared_table *st;
prev_state = appctx->st0;
if (!curpeer) {
curpeer = appctx->ctx.peers.ptr;
HA_SPIN_LOCK(PEER_LOCK, &curpeer->lock);
if (curpeer->appctx != appctx) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
}
repl = snprintf(trash.area, trash.size,
"%d\n",
PEER_SESS_SC_SUCCESSCODE);
repl = ci_putblk(si_ic(si), trash.area, repl);
if (repl <= 0) {
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* Register status code */
curpeer->statuscode = PEER_SESS_SC_SUCCESSCODE;
/* Awake main task */
task_wakeup(curpeers->sync_task, TASK_WOKEN_MSG);
/* Init confirm counter */
curpeer->confirm = 0;
/* Init cursors */
for (st = curpeer->tables; st ; st = st->next) {
st->last_get = st->last_acked = 0;
st->teaching_origin = st->last_pushed = st->update;
}
/* reset teaching and learning flags to 0 */
curpeer->flags &= PEER_TEACH_RESET;
curpeer->flags &= PEER_LEARN_RESET;
/* if current peer is local */
if (curpeer->local) {
/* if current host need resyncfrom local and no process assined */
if ((curpeers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMLOCAL &&
!(curpeers->flags & PEERS_F_RESYNC_ASSIGN)) {
/* assign local peer for a lesson, consider lesson already requested */
curpeer->flags |= PEER_F_LEARN_ASSIGN;
curpeers->flags |= (PEERS_F_RESYNC_ASSIGN|PEERS_F_RESYNC_PROCESS);
}
}
else if ((curpeers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMREMOTE &&
!(curpeers->flags & PEERS_F_RESYNC_ASSIGN)) {
/* assign peer for a lesson */
curpeer->flags |= PEER_F_LEARN_ASSIGN;
curpeers->flags |= PEERS_F_RESYNC_ASSIGN;
}
/* switch to waiting message state */
HA_ATOMIC_ADD(&connected_peers, 1);
appctx->st0 = PEER_SESS_ST_WAITMSG;
goto switchstate;
}
case PEER_SESS_ST_CONNECT: {
prev_state = appctx->st0;
if (!curpeer) {
curpeer = appctx->ctx.peers.ptr;
HA_SPIN_LOCK(PEER_LOCK, &curpeer->lock);
if (curpeer->appctx != appctx) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
}
/* Send headers */
repl = snprintf(trash.area, trash.size,
PEER_SESSION_PROTO_NAME " %u.%u\n%s\n%s %d %d\n",
PEER_MAJOR_VER,
(curpeer->flags & PEER_F_DWNGRD) ? PEER_DWNGRD_MINOR_VER : PEER_MINOR_VER,
curpeer->id,
localpeer,
(int)getpid(),
relative_pid);
if (repl >= trash.size) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
repl = ci_putblk(si_ic(si), trash.area, repl);
if (repl <= 0) {
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* switch to the waiting statuscode state */
appctx->st0 = PEER_SESS_ST_GETSTATUS;
/* fall through */
}
case PEER_SESS_ST_GETSTATUS: {
struct shared_table *st;
prev_state = appctx->st0;
if (!curpeer) {
curpeer = appctx->ctx.peers.ptr;
HA_SPIN_LOCK(PEER_LOCK, &curpeer->lock);
if (curpeer->appctx != appctx) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
}
if (si_ic(si)->flags & CF_WRITE_PARTIAL)
curpeer->statuscode = PEER_SESS_SC_CONNECTEDCODE;
reql = co_getline(si_oc(si), trash.area,
trash.size);
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
goto out;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
if (trash.area[reql-1] != '\n') {
/* Incomplete line, we quit */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.area[reql-2] == '\r'))
trash.area[reql-2] = 0;
else
trash.area[reql-1] = 0;
co_skip(si_oc(si), reql);
/* Register status code */
curpeer->statuscode = atoi(trash.area);
/* Awake main task */
task_wakeup(curpeers->sync_task, TASK_WOKEN_MSG);
/* If status code is success */
if (curpeer->statuscode == PEER_SESS_SC_SUCCESSCODE) {
/* Init cursors */
for (st = curpeer->tables; st ; st = st->next) {
st->last_get = st->last_acked = 0;
st->teaching_origin = st->last_pushed = st->update;
}
/* Init confirm counter */
curpeer->confirm = 0;
/* reset teaching and learning flags to 0 */
curpeer->flags &= PEER_TEACH_RESET;
curpeer->flags &= PEER_LEARN_RESET;
/* If current peer is local */
if (curpeer->local) {
/* flag to start to teach lesson */
curpeer->flags |= PEER_F_TEACH_PROCESS;
}
else if ((curpeers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMREMOTE &&
!(curpeers->flags & PEERS_F_RESYNC_ASSIGN)) {
/* If peer is remote and resync from remote is needed,
and no peer currently assigned */
/* assign peer for a lesson */
curpeer->flags |= PEER_F_LEARN_ASSIGN;
curpeers->flags |= PEERS_F_RESYNC_ASSIGN;
}
}
else {
if (curpeer->statuscode == PEER_SESS_SC_ERRVERSION)
curpeer->flags |= PEER_F_DWNGRD;
/* Status code is not success, abort */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
HA_ATOMIC_ADD(&connected_peers, 1);
appctx->st0 = PEER_SESS_ST_WAITMSG;
/* fall through */
}
case PEER_SESS_ST_WAITMSG: {
struct stksess *ts, *newts = NULL;
uint32_t msg_len = 0;
char *msg_cur = trash.area;
char *msg_end = trash.area;
unsigned char msg_head[7];
int totl = 0;
prev_state = appctx->st0;
if (!curpeer) {
curpeer = appctx->ctx.peers.ptr;
HA_SPIN_LOCK(PEER_LOCK, &curpeer->lock);
if (curpeer->appctx != appctx) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
}
reql = co_getblk(si_oc(si), (char *)msg_head, 2*sizeof(unsigned char), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
if (msg_head[1] >= 128) {
/* Read and Decode message length */
reql = co_getblk(si_oc(si), (char *)&msg_head[2], sizeof(unsigned char), totl);
if (reql <= 0) /* closed */
goto incomplete;
totl += reql;
if (msg_head[2] < 240) {
msg_len = msg_head[2];
}
else {
int i;
char *cur;
char *end;
for (i = 3 ; i < sizeof(msg_head) ; i++) {
reql = co_getblk(si_oc(si), (char *)&msg_head[i], sizeof(char), totl);
if (reql <= 0) /* closed */
goto incomplete;
totl += reql;
if (!(msg_head[i] & 0x80))
break;
}
if (i == sizeof(msg_head)) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
end = (char *)msg_head + sizeof(msg_head);
cur = (char *)&msg_head[2];
msg_len = intdecode(&cur, end);
if (!cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
}
/* Read message content */
if (msg_len) {
if (msg_len > trash.size) {
/* Status code is not success, abort */
appctx->st0 = PEER_SESS_ST_ERRSIZE;
goto switchstate;
}
reql = co_getblk(si_oc(si),
trash.area,
msg_len,
totl);
if (reql <= 0) /* closed */
goto incomplete;
totl += reql;
msg_end += msg_len;
}
}
if (msg_head[0] == PEER_MSG_CLASS_CONTROL) {
if (msg_head[1] == PEER_MSG_CTRL_RESYNCREQ) {
struct shared_table *st;
/* Reset message: remote need resync */
/* prepare tables fot a global push */
for (st = curpeer->tables; st; st = st->next) {
st->teaching_origin = st->last_pushed = st->table->update;
st->flags = 0;
}
/* reset teaching flags to 0 */
curpeer->flags &= PEER_TEACH_RESET;
/* flag to start to teach lesson */
curpeer->flags |= PEER_F_TEACH_PROCESS;
}
else if (msg_head[1] == PEER_MSG_CTRL_RESYNCFINISHED) {
if (curpeer->flags & PEER_F_LEARN_ASSIGN) {
curpeer->flags &= ~PEER_F_LEARN_ASSIGN;
curpeers->flags &= ~(PEERS_F_RESYNC_ASSIGN|PEERS_F_RESYNC_PROCESS);
curpeers->flags |= (PEERS_F_RESYNC_LOCAL|PEERS_F_RESYNC_REMOTE);
}
curpeer->confirm++;
}
else if (msg_head[1] == PEER_MSG_CTRL_RESYNCPARTIAL) {
if (curpeer->flags & PEER_F_LEARN_ASSIGN) {
curpeer->flags &= ~PEER_F_LEARN_ASSIGN;
curpeers->flags &= ~(PEERS_F_RESYNC_ASSIGN|PEERS_F_RESYNC_PROCESS);
curpeer->flags |= PEER_F_LEARN_NOTUP2DATE;
curpeers->resync_timeout = tick_add(now_ms, MS_TO_TICKS(5000));
task_wakeup(curpeers->sync_task, TASK_WOKEN_MSG);
}
curpeer->confirm++;
}
else if (msg_head[1] == PEER_MSG_CTRL_RESYNCCONFIRM) {
struct shared_table *st;
/* If stopping state */
if (stopping) {
/* Close session, push resync no more needed */
curpeer->flags |= PEER_F_TEACH_COMPLETE;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
for (st = curpeer->tables; st; st = st->next) {
st->update = st->last_pushed = st->teaching_origin;
st->flags = 0;
}
/* reset teaching flags to 0 */
curpeer->flags &= PEER_TEACH_RESET;
}
}
else if (msg_head[0] == PEER_MSG_CLASS_STICKTABLE) {
if (msg_head[1] == PEER_MSG_STKT_DEFINE) {
int table_id_len;
struct shared_table *st;
int table_type;
int table_keylen;
int table_id;
uint64_t table_data;
table_id = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
table_id_len = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
curpeer->remote_table = NULL;
if (!table_id_len || (msg_cur + table_id_len) >= msg_end) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
for (st = curpeer->tables; st; st = st->next) {
/* Reset IDs */
if (st->remote_id == table_id)
st->remote_id = 0;
if (!curpeer->remote_table
&& (table_id_len == strlen(st->table->id))
&& (memcmp(st->table->id, msg_cur, table_id_len) == 0)) {
curpeer->remote_table = st;
}
}
if (!curpeer->remote_table) {
goto ignore_msg;
}
msg_cur += table_id_len;
if (msg_cur >= msg_end) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
table_type = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
table_keylen = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
table_data = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
if (curpeer->remote_table->table->type != table_type
|| curpeer->remote_table->table->key_size != table_keylen) {
curpeer->remote_table = NULL;
goto ignore_msg;
}
curpeer->remote_table->remote_data = table_data;
curpeer->remote_table->remote_id = table_id;
}
else if (msg_head[1] == PEER_MSG_STKT_SWITCH) {
struct shared_table *st;
int table_id;
table_id = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
curpeer->remote_table = NULL;
for (st = curpeer->tables; st; st = st->next) {
if (st->remote_id == table_id) {
curpeer->remote_table = st;
break;
}
}
}
else if (msg_head[1] == PEER_MSG_STKT_UPDATE
|| msg_head[1] == PEER_MSG_STKT_INCUPDATE
|| msg_head[1] == PEER_MSG_STKT_UPDATE_TIMED
|| msg_head[1] == PEER_MSG_STKT_INCUPDATE_TIMED) {
struct shared_table *st = curpeer->remote_table;
uint32_t update;
int expire;
unsigned int data_type;
void *data_ptr;
/* Here we have data message */
if (!st)
goto ignore_msg;
expire = MS_TO_TICKS(st->table->expire);
if (msg_head[1] == PEER_MSG_STKT_UPDATE ||
msg_head[1] == PEER_MSG_STKT_UPDATE_TIMED) {
if (msg_len < sizeof(update)) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(&update, msg_cur, sizeof(update));
msg_cur += sizeof(update);
st->last_get = htonl(update);
}
else {
st->last_get++;
}
if (msg_head[1] == PEER_MSG_STKT_UPDATE_TIMED ||
msg_head[1] == PEER_MSG_STKT_INCUPDATE_TIMED) {
size_t expire_sz = sizeof expire;
if (msg_cur + expire_sz > msg_end) {
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(&expire, msg_cur, expire_sz);
msg_cur += expire_sz;
expire = ntohl(expire);
}
newts = stksess_new(st->table, NULL);
if (!newts)
goto ignore_msg;
if (st->table->type == SMP_T_STR) {
unsigned int to_read, to_store;
to_read = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
stksess_free(st->table, newts);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
to_store = MIN(to_read, st->table->key_size - 1);
if (msg_cur + to_store > msg_end) {
/* malformed message */
stksess_free(st->table, newts);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(newts->key.key, msg_cur, to_store);
newts->key.key[to_store] = 0;
msg_cur += to_read;
}
else if (st->table->type == SMP_T_SINT) {
unsigned int netinteger;
if (msg_cur + sizeof(netinteger) > msg_end) {
/* malformed message */
stksess_free(st->table, newts);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(&netinteger, msg_cur, sizeof(netinteger));
netinteger = ntohl(netinteger);
memcpy(newts->key.key, &netinteger, sizeof(netinteger));
msg_cur += sizeof(netinteger);
}
else {
if (msg_cur + st->table->key_size > msg_end) {
/* malformed message */
stksess_free(st->table, newts);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(newts->key.key, msg_cur, st->table->key_size);
msg_cur += st->table->key_size;
}
/* lookup for existing entry */
ts = stktable_set_entry(st->table, newts);
if (ts != newts) {
stksess_free(st->table, newts);
newts = NULL;
}
HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
for (data_type = 0 ; data_type < STKTABLE_DATA_TYPES ; data_type++) {
if ((1 << data_type) & st->remote_data) {
switch (stktable_data_types[data_type].std_type) {
case STD_T_SINT: {
int data;
data = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data_ptr = stktable_data_ptr(st->table, ts, data_type);
if (data_ptr)
stktable_data_cast(data_ptr, std_t_sint) = data;
break;
}
case STD_T_UINT: {
unsigned int data;
data = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data_ptr = stktable_data_ptr(st->table, ts, data_type);
if (data_ptr)
stktable_data_cast(data_ptr, std_t_uint) = data;
break;
}
case STD_T_ULL: {
unsigned long long data;
data = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data_ptr = stktable_data_ptr(st->table, ts, data_type);
if (data_ptr)
stktable_data_cast(data_ptr, std_t_ull) = data;
break;
}
case STD_T_FRQP: {
struct freq_ctr_period data;
/* First bit is reserved for the freq_ctr_period lock
Note: here we're still protected by the stksess lock
so we don't need to update the update the freq_ctr_period
using its internal lock */
data.curr_tick = tick_add(now_ms, -intdecode(&msg_cur, msg_end)) & ~0x1;
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data.curr_ctr = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data.prev_ctr = intdecode(&msg_cur, msg_end);
if (!msg_cur) {
/* malformed message */
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
data_ptr = stktable_data_ptr(st->table, ts, data_type);
if (data_ptr)
stktable_data_cast(data_ptr, std_t_frqp) = data;
break;
}
}
}
}
/* Force new expiration */
ts->expire = tick_add(now_ms, expire);
HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);
stktable_touch_remote(st->table, ts, 1);
}
else if (msg_head[1] == PEER_MSG_STKT_ACK) {
/* ack message */
uint32_t table_id ;
uint32_t update;
struct shared_table *st;
table_id = intdecode(&msg_cur, msg_end);
if (!msg_cur || (msg_cur + sizeof(update) > msg_end)) {
/* malformed message */
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
memcpy(&update, msg_cur, sizeof(update));
update = ntohl(update);
for (st = curpeer->tables; st; st = st->next) {
if (st->local_id == table_id) {
st->update = update;
break;
}
}
}
}
else if (msg_head[0] == PEER_MSG_CLASS_RESERVED) {
appctx->st0 = PEER_SESS_ST_ERRPROTO;
goto switchstate;
}
ignore_msg:
/* skip consumed message */
co_skip(si_oc(si), totl);
/* loop on that state to peek next message */
goto switchstate;
incomplete:
/* we get here when a co_getblk() returns <= 0 in reql */
if (reql < 0) {
/* there was an error */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* Need to request a resync */
if ((curpeer->flags & PEER_F_LEARN_ASSIGN) &&
(curpeers->flags & PEERS_F_RESYNC_ASSIGN) &&
!(curpeers->flags & PEERS_F_RESYNC_PROCESS)) {
unsigned char msg[2];
/* Current peer was elected to request a resync */
msg[0] = PEER_MSG_CLASS_CONTROL;
msg[1] = PEER_MSG_CTRL_RESYNCREQ;
/* message to buffer */
repl = ci_putblk(si_ic(si), (char *)msg, sizeof(msg));
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
curpeers->flags |= PEERS_F_RESYNC_PROCESS;
}
/* Nothing to read, now we start to write */
if (curpeer->tables) {
struct shared_table *st;
struct shared_table *last_local_table;
last_local_table = curpeer->last_local_table;
if (!last_local_table)
last_local_table = curpeer->tables;
st = last_local_table->next;
while (1) {
if (!st)
st = curpeer->tables;
/* It remains some updates to ack */
if (st->last_get != st->last_acked) {
int msglen;
msglen = peer_prepare_ackmsg(st,
trash.area,
trash.size);
if (!msglen) {
/* internal error: message does not fit in trash */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
st->last_acked = st->last_get;
}
if (!(curpeer->flags & PEER_F_TEACH_PROCESS)) {
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
if (!(curpeer->flags & PEER_F_LEARN_ASSIGN) &&
((int)(st->last_pushed - st->table->localupdate) < 0)) {
struct eb32_node *eb;
int new_pushed;
if (st != curpeer->last_local_table) {
int msglen;
msglen = peer_prepare_switchmsg(st,
trash.area,
trash.size);
if (!msglen) {
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
/* internal error: message does not fit in trash */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
/* no more write possible */
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
curpeer->last_local_table = st;
}
/* We force new pushed to 1 to force identifier in update message */
new_pushed = 1;
while (1) {
uint32_t msglen;
struct stksess *ts;
unsigned updateid;
/* push local updates */
eb = eb32_lookup_ge(&st->table->updates, st->last_pushed+1);
if (!eb) {
eb = eb32_first(&st->table->updates);
if (!eb || ((int)(eb->key - st->last_pushed) <= 0)) {
st->table->commitupdate = st->last_pushed = st->table->localupdate;
break;
}
}
if ((int)(eb->key - st->table->localupdate) > 0) {
st->table->commitupdate = st->last_pushed = st->table->localupdate;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
updateid = ts->upd.key;
ts->ref_cnt++;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
msglen = peer_prepare_updatemsg(ts, st, updateid,
trash.area,
trash.size,
new_pushed,
0);
if (!msglen) {
/* internal error: message does not fit in trash */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
st->last_pushed = updateid;
if ((int)(st->last_pushed - st->table->commitupdate) > 0)
st->table->commitupdate = st->last_pushed;
/* identifier may not needed in next update message */
new_pushed = 0;
}
}
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
}
else {
if (!(st->flags & SHTABLE_F_TEACH_STAGE1)) {
struct eb32_node *eb;
int new_pushed;
if (st != curpeer->last_local_table) {
int msglen;
msglen = peer_prepare_switchmsg(st,
trash.area,
trash.size);
if (!msglen) {
/* internal error: message does not fit in trash */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
curpeer->last_local_table = st;
}
/* We force new pushed to 1 to force identifier in update message */
new_pushed = 1;
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
while (1) {
uint32_t msglen;
struct stksess *ts;
int use_timed;
unsigned updateid;
/* push local updates */
eb = eb32_lookup_ge(&st->table->updates, st->last_pushed+1);
if (!eb) {
st->flags |= SHTABLE_F_TEACH_STAGE1;
eb = eb32_first(&st->table->updates);
if (eb)
st->last_pushed = eb->key - 1;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
updateid = ts->upd.key;
ts->ref_cnt++;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
use_timed = !(curpeer->flags & PEER_F_DWNGRD);
msglen = peer_prepare_updatemsg(ts, st, updateid,
trash.area,
trash.size,
new_pushed,
use_timed);
if (!msglen) {
/* internal error: message does not fit in trash */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
st->last_pushed = updateid;
/* identifier may not needed in next update message */
new_pushed = 0;
}
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
}
if (!(st->flags & SHTABLE_F_TEACH_STAGE2)) {
struct eb32_node *eb;
int new_pushed;
if (st != curpeer->last_local_table) {
int msglen;
msglen = peer_prepare_switchmsg(st,
trash.area,
trash.size);
if (!msglen) {
/* internal error: message does not fit in trash */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
curpeer->last_local_table = st;
}
/* We force new pushed to 1 to force identifier in update message */
new_pushed = 1;
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
while (1) {
uint32_t msglen;
struct stksess *ts;
int use_timed;
unsigned updateid;
/* push local updates */
eb = eb32_lookup_ge(&st->table->updates, st->last_pushed+1);
/* push local updates */
if (!eb || eb->key > st->teaching_origin) {
st->flags |= SHTABLE_F_TEACH_STAGE2;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
updateid = ts->upd.key;
ts->ref_cnt++;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
use_timed = !(curpeer->flags & PEER_F_DWNGRD);
msglen = peer_prepare_updatemsg(ts, st, updateid,
trash.area,
trash.size,
new_pushed,
use_timed);
if (!msglen) {
/* internal error: message does not fit in trash */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* message to buffer */
repl = ci_putblk(si_ic(si),
trash.area,
msglen);
if (repl <= 0) {
/* no more write possible */
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
if (repl == -1) {
goto full;
}
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
HA_SPIN_LOCK(STK_TABLE_LOCK, &st->table->lock);
ts->ref_cnt--;
st->last_pushed = updateid;
/* identifier may not needed in next update message */
new_pushed = 0;
}
HA_SPIN_UNLOCK(STK_TABLE_LOCK, &st->table->lock);
}
}
if (st == last_local_table)
break;
st = st->next;
}
}
if ((curpeer->flags & PEER_F_TEACH_PROCESS) && !(curpeer->flags & PEER_F_TEACH_FINISHED)) {
unsigned char msg[2];
/* Current peer was elected to request a resync */
msg[0] = PEER_MSG_CLASS_CONTROL;
msg[1] = ((curpeers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FINISHED) ? PEER_MSG_CTRL_RESYNCFINISHED : PEER_MSG_CTRL_RESYNCPARTIAL;
/* process final lesson message */
repl = ci_putblk(si_ic(si), (char *)msg, sizeof(msg));
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* flag finished message sent */
curpeer->flags |= PEER_F_TEACH_FINISHED;
}
/* Confirm finished or partial messages */
while (curpeer->confirm) {
unsigned char msg[2];
/* There is a confirm messages to send */
msg[0] = PEER_MSG_CLASS_CONTROL;
msg[1] = PEER_MSG_CTRL_RESYNCCONFIRM;
/* message to buffer */
repl = ci_putblk(si_ic(si), (char *)msg, sizeof(msg));
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
curpeer->confirm--;
}
/* noting more to do */
goto out;
}
case PEER_SESS_ST_EXIT:
if (prev_state == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
prev_state = appctx->st0;
repl = snprintf(trash.area, trash.size,
"%d\n", appctx->st1);
if (ci_putblk(si_ic(si), trash.area, repl) == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
case PEER_SESS_ST_ERRSIZE: {
unsigned char msg[2];
if (prev_state == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
prev_state = appctx->st0;
msg[0] = PEER_MSG_CLASS_ERROR;
msg[1] = PEER_MSG_ERR_SIZELIMIT;
if (ci_putblk(si_ic(si), (char *)msg, sizeof(msg)) == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
case PEER_SESS_ST_ERRPROTO: {
unsigned char msg[2];
if (prev_state == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
prev_state = appctx->st0;
msg[0] = PEER_MSG_CLASS_ERROR;
msg[1] = PEER_MSG_ERR_PROTOCOL;
if (ci_putblk(si_ic(si), (char *)msg, sizeof(msg)) == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
prev_state = appctx->st0;
/* fall through */
}
case PEER_SESS_ST_END: {
if (prev_state == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
prev_state = appctx->st0;
if (curpeer) {
HA_SPIN_UNLOCK(PEER_LOCK, &curpeer->lock);
curpeer = NULL;
}
si_shutw(si);
si_shutr(si);
si_ic(si)->flags |= CF_READ_NULL;
goto out;
}
}
}
out:
si_oc(si)->flags |= CF_READ_DONTWAIT;
if (curpeer)
HA_SPIN_UNLOCK(PEER_LOCK, &curpeer->lock);
return;
full:
si_rx_room_blk(si);
goto out;
}
static struct applet peer_applet = {
.obj_type = OBJ_TYPE_APPLET,
.name = "<PEER>", /* used for logging */
.fct = peer_io_handler,
.release = peer_session_release,
};
/*
* Use this function to force a close of a peer session
*/
static void peer_session_forceshutdown(struct appctx *appctx)
{
/* Note that the peer sessions which have just been created
* (->st0 == PEER_SESS_ST_CONNECT) must not
* be shutdown, if not, the TCP session will never be closed
* and stay in CLOSE_WAIT state after having been closed by
* the remote side.
*/
if (!appctx || appctx->st0 == PEER_SESS_ST_CONNECT)
return;
if (appctx->applet != &peer_applet)
return;
if (appctx->st0 == PEER_SESS_ST_WAITMSG)
HA_ATOMIC_SUB(&connected_peers, 1);
appctx->st0 = PEER_SESS_ST_END;
appctx_wakeup(appctx);
}
/* Pre-configures a peers frontend to accept incoming connections */
void peers_setup_frontend(struct proxy *fe)
{
fe->last_change = now.tv_sec;
fe->cap = PR_CAP_FE;
fe->maxconn = 0;
fe->conn_retries = CONN_RETRIES;
fe->timeout.client = MS_TO_TICKS(5000);
fe->accept = frontend_accept;
fe->default_target = &peer_applet.obj_type;
fe->options2 |= PR_O2_INDEPSTR | PR_O2_SMARTCON | PR_O2_SMARTACC;
fe->bind_proc = 0; /* will be filled by users */
}
/*
* Create a new peer session in assigned state (connect will start automatically)
*/
static struct appctx *peer_session_create(struct peers *peers, struct peer *peer)
{
struct proxy *p = peers->peers_fe; /* attached frontend */
struct appctx *appctx;
struct session *sess;
struct stream *s;
struct connection *conn;
struct conn_stream *cs;
peer->reconnect = tick_add(now_ms, MS_TO_TICKS(5000));
peer->statuscode = PEER_SESS_SC_CONNECTCODE;
s = NULL;
appctx = appctx_new(&peer_applet, tid_bit);
if (!appctx)
goto out_close;
appctx->st0 = PEER_SESS_ST_CONNECT;
appctx->ctx.peers.ptr = (void *)peer;
sess = session_new(p, NULL, &appctx->obj_type);
if (!sess) {
ha_alert("out of memory in peer_session_create().\n");
goto out_free_appctx;
}
if ((s = stream_new(sess, &appctx->obj_type)) == NULL) {
ha_alert("Failed to initialize stream in peer_session_create().\n");
goto out_free_sess;
}
/* The tasks below are normally what is supposed to be done by
* fe->accept().
*/
s->flags = SF_ASSIGNED|SF_ADDR_SET;
/* applet is waiting for data */
si_cant_get(&s->si[0]);
appctx_wakeup(appctx);
/* initiate an outgoing connection */
s->si[1].flags |= SI_FL_NOLINGER;
si_set_state(&s->si[1], SI_ST_ASS);
/* automatically prepare the stream interface to connect to the
* pre-initialized connection in si->conn.
*/
if (unlikely((conn = conn_new()) == NULL))
goto out_free_strm;
if (unlikely((cs = cs_new(conn)) == NULL))
goto out_free_conn;
conn->target = s->target = &s->be->obj_type;
memcpy(&conn->addr.to, &peer->addr, sizeof(conn->addr.to));
conn_prepare(conn, peer->proto, peer->xprt);
conn_install_mux(conn, &mux_pt_ops, cs, s->be);
si_attach_cs(&s->si[1], cs);
s->do_log = NULL;
s->uniq_id = 0;
s->res.flags |= CF_READ_DONTWAIT;
peer->appctx = appctx;
task_wakeup(s->task, TASK_WOKEN_INIT);
HA_ATOMIC_ADD(&active_peers, 1);
return appctx;
/* Error unrolling */
out_free_conn:
conn_free(conn);
out_free_strm:
LIST_DEL(&s->list);
pool_free(pool_head_stream, s);
out_free_sess:
session_free(sess);
out_free_appctx:
appctx_free(appctx);
out_close:
return NULL;
}
/*
* Task processing function to manage re-connect and peer session
* tasks wakeup on local update.
*/
static struct task *process_peer_sync(struct task * task, void *context, unsigned short state)
{
struct peers *peers = context;
struct peer *ps;
struct shared_table *st;
task->expire = TICK_ETERNITY;
if (!peers->peers_fe) {
/* this one was never started, kill it */
signal_unregister_handler(peers->sighandler);
task_delete(peers->sync_task);
task_free(peers->sync_task);
peers->sync_task = NULL;
return NULL;
}
/* Acquire lock for all peers of the section */
for (ps = peers->remote; ps; ps = ps->next)
HA_SPIN_LOCK(PEER_LOCK, &ps->lock);
if (!stopping) {
/* Normal case (not soft stop)*/
if (((peers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMLOCAL) &&
(!nb_oldpids || tick_is_expired(peers->resync_timeout, now_ms)) &&
!(peers->flags & PEERS_F_RESYNC_ASSIGN)) {
/* Resync from local peer needed
no peer was assigned for the lesson
and no old local peer found
or resync timeout expire */
/* flag no more resync from local, to try resync from remotes */
peers->flags |= PEERS_F_RESYNC_LOCAL;
/* reschedule a resync */
peers->resync_timeout = tick_add(now_ms, MS_TO_TICKS(5000));
}
/* For each session */
for (ps = peers->remote; ps; ps = ps->next) {
/* For each remote peers */
if (!ps->local) {
if (!ps->appctx) {
/* no active peer connection */
if (ps->statuscode == 0 ||
((ps->statuscode == PEER_SESS_SC_CONNECTCODE ||
ps->statuscode == PEER_SESS_SC_SUCCESSCODE ||
ps->statuscode == PEER_SESS_SC_CONNECTEDCODE) &&
tick_is_expired(ps->reconnect, now_ms))) {
/* connection never tried
* or previous peer connection established with success
* or previous peer connection failed while connecting
* and reconnection timer is expired */
/* retry a connect */
ps->appctx = peer_session_create(peers, ps);
}
else if (!tick_is_expired(ps->reconnect, now_ms)) {
/* If previous session failed during connection
* but reconnection timer is not expired */
/* reschedule task for reconnect */
task->expire = tick_first(task->expire, ps->reconnect);
}
/* else do nothing */
} /* !ps->appctx */
else if (ps->statuscode == PEER_SESS_SC_SUCCESSCODE) {
/* current peer connection is active and established */
if (((peers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMREMOTE) &&
!(peers->flags & PEERS_F_RESYNC_ASSIGN) &&
!(ps->flags & PEER_F_LEARN_NOTUP2DATE)) {
/* Resync from a remote is needed
* and no peer was assigned for lesson
* and current peer may be up2date */
/* assign peer for the lesson */
ps->flags |= PEER_F_LEARN_ASSIGN;
peers->flags |= PEERS_F_RESYNC_ASSIGN;
/* wake up peer handler to handle a request of resync */
appctx_wakeup(ps->appctx);
}
else {
/* Awake session if there is data to push */
for (st = ps->tables; st ; st = st->next) {
if ((int)(st->last_pushed - st->table->localupdate) < 0) {
/* wake up the peer handler to push local updates */
appctx_wakeup(ps->appctx);
break;
}
}
}
/* else do nothing */
} /* SUCCESSCODE */
} /* !ps->peer->local */
} /* for */
/* Resync from remotes expired: consider resync is finished */
if (((peers->flags & PEERS_RESYNC_STATEMASK) == PEERS_RESYNC_FROMREMOTE) &&
!(peers->flags & PEERS_F_RESYNC_ASSIGN) &&
tick_is_expired(peers->resync_timeout, now_ms)) {
/* Resync from remote peer needed
* no peer was assigned for the lesson
* and resync timeout expire */
/* flag no more resync from remote, consider resync is finished */
peers->flags |= PEERS_F_RESYNC_REMOTE;
}
if ((peers->flags & PEERS_RESYNC_STATEMASK) != PEERS_RESYNC_FINISHED) {
/* Resync not finished*/
/* reschedule task to resync timeout if not expired, to ended resync if needed */
if (!tick_is_expired(peers->resync_timeout, now_ms))
task->expire = tick_first(task->expire, peers->resync_timeout);
}
} /* !stopping */
else {
/* soft stop case */
if (state & TASK_WOKEN_SIGNAL) {
/* We've just received the signal */
if (!(peers->flags & PEERS_F_DONOTSTOP)) {
/* add DO NOT STOP flag if not present */
HA_ATOMIC_ADD(&jobs, 1);
peers->flags |= PEERS_F_DONOTSTOP;
ps = peers->local;
for (st = ps->tables; st ; st = st->next)
st->table->syncing++;
}
/* disconnect all connected peers */
for (ps = peers->remote; ps; ps = ps->next) {
/* we're killing a connection, we must apply a random delay before
* retrying otherwise the other end will do the same and we can loop
* for a while.
*/
ps->reconnect = tick_add(now_ms, MS_TO_TICKS(50 + random() % 2000));
if (ps->appctx) {
peer_session_forceshutdown(ps->appctx);
ps->appctx = NULL;
}
}
}
ps = peers->local;
if (ps->flags & PEER_F_TEACH_COMPLETE) {
if (peers->flags & PEERS_F_DONOTSTOP) {
/* resync of new process was complete, current process can die now */
HA_ATOMIC_SUB(&jobs, 1);
peers->flags &= ~PEERS_F_DONOTSTOP;
for (st = ps->tables; st ; st = st->next)
st->table->syncing--;
}
}
else if (!ps->appctx) {
/* If there's no active peer connection */
if (ps->statuscode == 0 ||
ps->statuscode == PEER_SESS_SC_SUCCESSCODE ||
ps->statuscode == PEER_SESS_SC_CONNECTEDCODE ||
ps->statuscode == PEER_SESS_SC_TRYAGAIN) {
/* connection never tried
* or previous peer connection was successfully established
* or previous tcp connect succeeded but init state incomplete
* or during previous connect, peer replies a try again statuscode */
/* connect to the peer */
peer_session_create(peers, ps);
}
else {
/* Other error cases */
if (peers->flags & PEERS_F_DONOTSTOP) {
/* unable to resync new process, current process can die now */
HA_ATOMIC_SUB(&jobs, 1);
peers->flags &= ~PEERS_F_DONOTSTOP;
for (st = ps->tables; st ; st = st->next)
st->table->syncing--;
}
}
}
else if (ps->statuscode == PEER_SESS_SC_SUCCESSCODE ) {
/* current peer connection is active and established
* wake up all peer handlers to push remaining local updates */
for (st = ps->tables; st ; st = st->next) {
if ((int)(st->last_pushed - st->table->localupdate) < 0) {
appctx_wakeup(ps->appctx);
break;
}
}
}
} /* stopping */
/* Release lock for all peers of the section */
for (ps = peers->remote; ps; ps = ps->next)
HA_SPIN_UNLOCK(PEER_LOCK, &ps->lock);
/* Wakeup for re-connect */
return task;
}
/*
* returns 0 in case of error.
*/
int peers_init_sync(struct peers *peers)
{
struct peer * curpeer;
struct listener *listener;
for (curpeer = peers->remote; curpeer; curpeer = curpeer->next) {
peers->peers_fe->maxconn += 3;
}
list_for_each_entry(listener, &peers->peers_fe->conf.listeners, by_fe)
listener->maxconn = peers->peers_fe->maxconn;
peers->sync_task = task_new(MAX_THREADS_MASK);
if (!peers->sync_task)
return 0;
peers->sync_task->process = process_peer_sync;
peers->sync_task->context = (void *)peers;
peers->sighandler = signal_register_task(0, peers->sync_task, 0);
task_wakeup(peers->sync_task, TASK_WOKEN_INIT);
return 1;
}
/*
* Function used to register a table for sync on a group of peers
*
*/
void peers_register_table(struct peers *peers, struct stktable *table)
{
struct shared_table *st;
struct peer * curpeer;
int id = 0;
for (curpeer = peers->remote; curpeer; curpeer = curpeer->next) {
st = calloc(1,sizeof(*st));
st->table = table;
st->next = curpeer->tables;
if (curpeer->tables)
id = curpeer->tables->local_id;
st->local_id = id + 1;
curpeer->tables = st;
}
table->sync_task = peers->sync_task;
}
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