/*
* 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_session *ps = (struct peer_session *)appctx->ctx.peers.ptr;
/* appctx->ctx.peers.ptr is not a peer session */
if (appctx->st0 < PEER_SESS_ST_SENDSUCCESS)
return;
/* peer session identified */
if (ps) {
if (ps->stream == s) {
ps->stream = NULL;
ps->appctx = NULL;
if (ps->flags & PEER_F_LEARN_ASSIGN) {
/* unassign current peer for learning */
ps->flags &= ~(PEER_F_LEARN_ASSIGN);
ps->table->flags &= ~(SHTABLE_F_RESYNC_ASSIGN|SHTABLE_F_RESYNC_PROCESS);
/* reschedule a resync */
ps->table->resync_timeout = tick_add(now_ms, MS_TO_TICKS(5000));
}
/* reset teaching and learning flags to 0 */
ps->flags &= PEER_TEACH_RESET;
ps->flags &= PEER_LEARN_RESET;
}
task_wakeup(ps->table->sync_task, TASK_WOKEN_MSG);
}
}
/*
* 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 = (struct peers *)strm_fe(s)->parent;
int reql = 0;
int repl = 0;
while (1) {
switchstate:
switch(appctx->st0) {
case PEER_SESS_ST_ACCEPT:
appctx->ctx.peers.ptr = NULL;
appctx->st0 = PEER_SESS_ST_GETVERSION;
/* fall through */
case PEER_SESS_ST_GETVERSION:
reql = bo_getline(si_oc(si), trash.str, 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.str[reql-1] != '\n') {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.str[reql-2] == '\r'))
trash.str[reql-2] = 0;
else
trash.str[reql-1] = 0;
bo_skip(si_oc(si), reql);
/* test version */
if (strcmp(PEER_SESSION_PROTO_NAME " 1.0", trash.str) != 0) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRVERSION;
/* test protocol */
if (strncmp(PEER_SESSION_PROTO_NAME " ", trash.str, strlen(PEER_SESSION_PROTO_NAME)+1) != 0)
appctx->st1 = PEER_SESS_SC_ERRPROTO;
goto switchstate;
}
appctx->st0 = PEER_SESS_ST_GETHOST;
/* fall through */
case PEER_SESS_ST_GETHOST:
reql = bo_getline(si_oc(si), trash.str, 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.str[reql-1] != '\n') {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.str[reql-2] == '\r'))
trash.str[reql-2] = 0;
else
trash.str[reql-1] = 0;
bo_skip(si_oc(si), reql);
/* test hostname match */
if (strcmp(localpeer, trash.str) != 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: {
struct peer *curpeer;
char *p;
reql = bo_getline(si_oc(si), trash.str, 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.str[reql-1] != '\n') {
/* Incomplete line, we quit */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.str[reql-2] == '\r'))
trash.str[reql-2] = 0;
else
trash.str[reql-1] = 0;
bo_skip(si_oc(si), reql);
/* parse line "<peer name> <pid>" */
p = strchr(trash.str, ' ');
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.str) == 0)
break;
}
/* if unknown peer */
if (!curpeer) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPEER;
goto switchstate;
}
appctx->ctx.peers.ptr = curpeer;
appctx->st0 = PEER_SESS_ST_GETTABLE;
/* fall through */
}
case PEER_SESS_ST_GETTABLE: {
struct peer *curpeer = (struct peer *)appctx->ctx.peers.ptr;
struct shared_table *st;
struct peer_session *ps = NULL;
unsigned long key_type;
size_t key_size;
char *p;
reql = bo_getline(si_oc(si), trash.str, trash.size);
if (reql <= 0) { /* closed or EOL not found */
if (reql == 0)
goto out;
appctx->ctx.peers.ptr = NULL;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* Re init appctx->ctx.peers.ptr to null, to handle correctly a release case */
appctx->ctx.peers.ptr = NULL;
if (trash.str[reql-1] != '\n') {
/* Incomplete line, we quit */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.str[reql-2] == '\r'))
trash.str[reql-2] = 0;
else
trash.str[reql-1] = 0;
bo_skip(si_oc(si), reql);
/* Parse line "<table name> <type> <size>" */
p = strchr(trash.str, ' ');
if (!p) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPROTO;
goto switchstate;
}
*p = 0;
key_type = (unsigned long)atol(p+1);
p = strchr(p+1, ' ');
if (!p) {
appctx->ctx.peers.ptr = NULL;
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPROTO;
goto switchstate;
}
key_size = (size_t)atoi(p);
for (st = curpeers->tables; st; st = st->next) {
/* If table name matches */
if (strcmp(st->table->id, trash.str) == 0) {
/* Check key size mismatches, except for strings
* which may be truncated as long as they fit in
* a buffer.
*/
if (key_size != st->table->key_size &&
(key_type != STKTABLE_TYPE_STRING ||
1 + 4 + 4 + key_size - 1 >= trash.size)) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRSIZE;
goto switchstate;
}
/* If key type mismatches */
if (key_type != st->table->type) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRTYPE;
goto switchstate;
}
/* lookup peer stream of current peer */
for (ps = st->sessions; ps; ps = ps->next) {
if (ps->peer == curpeer) {
/* If stream already active, replaced by new one */
if (ps->stream && ps->stream != s) {
if (ps->peer->local) {
/* Local connection, reply a retry */
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_TRYAGAIN;
goto switchstate;
}
peer_session_forceshutdown(ps->stream);
}
ps->stream = s;
ps->appctx = appctx;
break;
}
}
break;
}
}
/* If table not found */
if (!st){
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRTABLE;
goto switchstate;
}
/* If no peer session for current peer */
if (!ps) {
appctx->st0 = PEER_SESS_ST_EXIT;
appctx->st1 = PEER_SESS_SC_ERRPEER;
goto switchstate;
}
appctx->ctx.peers.ptr = ps;
appctx->st0 = PEER_SESS_ST_SENDSUCCESS;
/* fall through */
}
case PEER_SESS_ST_SENDSUCCESS: {
struct peer_session *ps = (struct peer_session *)appctx->ctx.peers.ptr;
repl = snprintf(trash.str, trash.size, "%d\n", PEER_SESS_SC_SUCCESSCODE);
repl = bi_putblk(si_ic(si), trash.str, repl);
if (repl <= 0) {
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* Register status code */
ps->statuscode = PEER_SESS_SC_SUCCESSCODE;
/* Awake main task */
task_wakeup(ps->table->sync_task, TASK_WOKEN_MSG);
/* Init cursors */
ps->teaching_origin =ps->lastpush = ps->lastack = ps->pushack = 0;
ps->pushed = ps->update;
/* Init confirm counter */
ps->confirm = 0;
/* reset teaching and learning flags to 0 */
ps->flags &= PEER_TEACH_RESET;
ps->flags &= PEER_LEARN_RESET;
/* if current peer is local */
if (ps->peer->local) {
/* if table need resyncfrom local and no process assined */
if ((ps->table->flags & SHTABLE_RESYNC_STATEMASK) == SHTABLE_RESYNC_FROMLOCAL &&
!(ps->table->flags & SHTABLE_F_RESYNC_ASSIGN)) {
/* assign local peer for a lesson, consider lesson already requested */
ps->flags |= PEER_F_LEARN_ASSIGN;
ps->table->flags |= (SHTABLE_F_RESYNC_ASSIGN|SHTABLE_F_RESYNC_PROCESS);
}
}
else if ((ps->table->flags & SHTABLE_RESYNC_STATEMASK) == SHTABLE_RESYNC_FROMREMOTE &&
!(ps->table->flags & SHTABLE_F_RESYNC_ASSIGN)) {
/* assign peer for a lesson */
ps->flags |= PEER_F_LEARN_ASSIGN;
ps->table->flags |= SHTABLE_F_RESYNC_ASSIGN;
}
/* switch to waiting message state */
appctx->st0 = PEER_SESS_ST_WAITMSG;
goto switchstate;
}
case PEER_SESS_ST_CONNECT: {
struct peer_session *ps = (struct peer_session *)appctx->ctx.peers.ptr;
/* Send headers */
repl = snprintf(trash.str, trash.size,
PEER_SESSION_PROTO_NAME " 1.0\n%s\n%s %d\n%s %lu %d\n",
ps->peer->id,
localpeer,
(int)getpid(),
ps->table->table->id,
ps->table->table->type,
(int)ps->table->table->key_size);
if (repl >= trash.size) {
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
repl = bi_putblk(si_ic(si), trash.str, 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 peer_session *ps = (struct peer_session *)appctx->ctx.peers.ptr;
if (si_ic(si)->flags & CF_WRITE_PARTIAL)
ps->statuscode = PEER_SESS_SC_CONNECTEDCODE;
reql = bo_getline(si_oc(si), trash.str, 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.str[reql-1] != '\n') {
/* Incomplete line, we quit */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
else if (reql > 1 && (trash.str[reql-2] == '\r'))
trash.str[reql-2] = 0;
else
trash.str[reql-1] = 0;
bo_skip(si_oc(si), reql);
/* Register status code */
ps->statuscode = atoi(trash.str);
/* Awake main task */
task_wakeup(ps->table->sync_task, TASK_WOKEN_MSG);
/* If status code is success */
if (ps->statuscode == PEER_SESS_SC_SUCCESSCODE) {
/* Init cursors */
ps->teaching_origin = ps->lastpush = ps->lastack = ps->pushack = 0;
ps->pushed = ps->update;
/* Init confirm counter */
ps->confirm = 0;
/* reset teaching and learning flags to 0 */
ps->flags &= PEER_TEACH_RESET;
ps->flags &= PEER_LEARN_RESET;
/* If current peer is local */
if (ps->peer->local) {
/* Init cursors to push a resync */
ps->teaching_origin = ps->pushed = ps->table->table->update;
/* flag to start to teach lesson */
ps->flags |= PEER_F_TEACH_PROCESS;
}
else if ((ps->table->flags & SHTABLE_RESYNC_STATEMASK) == SHTABLE_RESYNC_FROMREMOTE &&
!(ps->table->flags & SHTABLE_F_RESYNC_ASSIGN)) {
/* If peer is remote and resync from remote is needed,
and no peer currently assigned */
/* assign peer for a lesson */
ps->flags |= PEER_F_LEARN_ASSIGN;
ps->table->flags |= SHTABLE_F_RESYNC_ASSIGN;
}
}
else {
/* Status code is not success, abort */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
appctx->st0 = PEER_SESS_ST_WAITMSG;
/* fall through */
}
case PEER_SESS_ST_WAITMSG: {
struct peer_session *ps = (struct peer_session *)appctx->ctx.peers.ptr;
struct stksess *ts, *newts = NULL;
char c;
int totl = 0;
reql = bo_getblk(si_oc(si), (char *)&c, sizeof(c), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
if ((c & 0x80) || (c == 'D')) {
/* Here we have data message */
unsigned int pushack;
int srvid;
uint32_t netinteger;
/* Compute update remote version */
if (c & 0x80) {
pushack = ps->pushack + (unsigned int)(c & 0x7F);
}
else {
reql = bo_getblk(si_oc(si), (char *)&netinteger, sizeof(netinteger), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
pushack = ntohl(netinteger);
}
/* Read key. The string keys are read in two steps, the first step
* consists in reading whatever fits into the table directly into
* the pre-allocated key. The second step consists in simply
* draining all exceeding data. This can happen for example after a
* config reload with a smaller key size for the stick table than
* what was previously set, or when facing the impossibility to
* allocate a new stksess (for example when the table is full with
* "nopurge").
*/
if (ps->table->table->type == STKTABLE_TYPE_STRING) {
unsigned int to_read, to_store;
/* read size first */
reql = bo_getblk(si_oc(si), (char *)&netinteger, sizeof(netinteger), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
to_store = 0;
to_read = ntohl(netinteger);
if (to_read + totl > si_ob(si)->size) {
/* impossible to read a key this large, abort */
reql = -1;
goto incomplete;
}
newts = stksess_new(ps->table->table, NULL);
if (newts)
to_store = MIN(to_read, ps->table->table->key_size - 1);
/* we read up to two blocks, the first one goes into the key,
* the rest is drained into the trash.
*/
if (to_store) {
reql = bo_getblk(si_oc(si), (char *)newts->key.key, to_store, totl);
if (reql <= 0) /* closed or incomplete */
goto incomplete;
newts->key.key[reql] = 0;
totl += reql;
to_read -= reql;
}
if (to_read) {
reql = bo_getblk(si_oc(si), trash.str, to_read, totl);
if (reql <= 0) /* closed or incomplete */
goto incomplete;
totl += reql;
}
}
else if (ps->table->table->type == STKTABLE_TYPE_INTEGER) {
reql = bo_getblk(si_oc(si), (char *)&netinteger, sizeof(netinteger), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
newts = stksess_new(ps->table->table, NULL);
if (newts) {
netinteger = ntohl(netinteger);
memcpy(newts->key.key, &netinteger, sizeof(netinteger));
}
totl += reql;
}
else {
/* type ip or binary */
newts = stksess_new(ps->table->table, NULL);
reql = bo_getblk(si_oc(si), newts ? (char *)newts->key.key : trash.str, ps->table->table->key_size, totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
}
/* read server id */
reql = bo_getblk(si_oc(si), (char *)&netinteger, sizeof(netinteger), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
srvid = ntohl(netinteger);
/* update entry */
if (newts) {
/* lookup for existing entry */
ts = stktable_lookup(ps->table->table, newts);
if (ts) {
/* the entry already exist, we can free ours */
stktable_touch(ps->table->table, ts, 0);
stksess_free(ps->table->table, newts);
newts = NULL;
}
else {
struct eb32_node *eb;
/* create new entry */
ts = stktable_store(ps->table->table, newts, 0);
newts = NULL; /* don't reuse it */
ts->upd.key= (++ps->table->table->update)+(2^31);
eb = eb32_insert(&ps->table->table->updates, &ts->upd);
if (eb != &ts->upd) {
eb32_delete(eb);
eb32_insert(&ps->table->table->updates, &ts->upd);
}
}
/* update entry */
if (srvid && stktable_data_ptr(ps->table->table, ts, STKTABLE_DT_SERVER_ID))
stktable_data_cast(stktable_data_ptr(ps->table->table, ts, STKTABLE_DT_SERVER_ID), server_id) = srvid;
ps->pushack = pushack;
}
}
else if (c == 'R') {
/* Reset message: remote need resync */
/* reinit counters for a resync */
ps->lastpush = 0;
ps->teaching_origin = ps->pushed = ps->table->table->update;
/* reset teaching flags to 0 */
ps->flags &= PEER_TEACH_RESET;
/* flag to start to teach lesson */
ps->flags |= PEER_F_TEACH_PROCESS;
}
else if (c == 'F') {
/* Finish message, all known updates have been pushed by remote */
/* and remote is up to date */
/* If resync is in progress with remote peer */
if (ps->flags & PEER_F_LEARN_ASSIGN) {
/* unassign current peer for learning */
ps->flags &= ~PEER_F_LEARN_ASSIGN;
ps->table->flags &= ~(SHTABLE_F_RESYNC_ASSIGN|SHTABLE_F_RESYNC_PROCESS);
/* Consider table is now up2date, resync resync no more needed from local neither remote */
ps->table->flags |= (SHTABLE_F_RESYNC_LOCAL|SHTABLE_F_RESYNC_REMOTE);
}
/* Increase confirm counter to launch a confirm message */
ps->confirm++;
}
else if (c == 'c') {
/* confirm message, remote peer is now up to date with us */
/* If stopping state */
if (stopping) {
/* Close session, push resync no more needed */
ps->flags |= PEER_F_TEACH_COMPLETE;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* reset teaching flags to 0 */
ps->flags &= PEER_TEACH_RESET;
}
else if (c == 'C') {
/* Continue message, all known updates have been pushed by remote */
/* but remote is not up to date */
/* If resync is in progress with current peer */
if (ps->flags & PEER_F_LEARN_ASSIGN) {
/* unassign current peer */
ps->flags &= ~PEER_F_LEARN_ASSIGN;
ps->table->flags &= ~(SHTABLE_F_RESYNC_ASSIGN|SHTABLE_F_RESYNC_PROCESS);
/* flag current peer is not up 2 date to try from an other */
ps->flags |= PEER_F_LEARN_NOTUP2DATE;
/* reschedule a resync */
ps->table->resync_timeout = tick_add(now_ms, MS_TO_TICKS(5000));
task_wakeup(ps->table->sync_task, TASK_WOKEN_MSG);
}
ps->confirm++;
}
else if (c == 'A') {
/* ack message */
uint32_t netinteger;
reql = bo_getblk(si_oc(si), (char *)&netinteger, sizeof(netinteger), totl);
if (reql <= 0) /* closed or EOL not found */
goto incomplete;
totl += reql;
/* Consider remote is up to date with "acked" version */
ps->update = ntohl(netinteger);
}
else {
/* Unknown message */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* skip consumed message */
bo_skip(si_oc(si), totl);
/* loop on that state to peek next message */
goto switchstate;
incomplete:
/* we get here when a bo_getblk() returns <= 0 in reql */
/* first, we may have to release newts */
if (newts) {
stksess_free(ps->table->table, newts);
newts = NULL;
}
if (reql < 0) {
/* there was an error */
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* Nothing to read, now we start to write */
/* Confirm finished or partial messages */
while (ps->confirm) {
/* There is a confirm messages to send */
repl = bi_putchr(si_ic(si), 'c');
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->confirm--;
}
/* Need to request a resync */
if ((ps->flags & PEER_F_LEARN_ASSIGN) &&
(ps->table->flags & SHTABLE_F_RESYNC_ASSIGN) &&
!(ps->table->flags & SHTABLE_F_RESYNC_PROCESS)) {
/* Current peer was elected to request a resync */
repl = bi_putchr(si_ic(si), 'R');
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->table->flags |= SHTABLE_F_RESYNC_PROCESS;
}
/* It remains some updates to ack */
if (ps->pushack != ps->lastack) {
uint32_t netinteger;
trash.str[0] = 'A';
netinteger = htonl(ps->pushack);
memcpy(&trash.str[1], &netinteger, sizeof(netinteger));
repl = bi_putblk(si_ic(si), trash.str, 1+sizeof(netinteger));
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->lastack = ps->pushack;
}
if (ps->flags & PEER_F_TEACH_PROCESS) {
/* current peer was requested for a lesson */
if (!(ps->flags & PEER_F_TEACH_STAGE1)) {
/* lesson stage 1 not complete */
struct eb32_node *eb;
eb = eb32_lookup_ge(&ps->table->table->updates, ps->pushed+1);
while (1) {
int msglen;
struct stksess *ts;
if (!eb) {
/* flag lesson stage1 complete */
ps->flags |= PEER_F_TEACH_STAGE1;
eb = eb32_first(&ps->table->table->updates);
if (eb)
ps->pushed = eb->key - 1;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
msglen = peer_prepare_datamsg(ts, ps, trash.str, trash.size);
if (msglen) {
/* message to buffer */
repl = bi_putblk(si_ic(si), trash.str, msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->lastpush = ps->pushed = ts->upd.key;
}
eb = eb32_next(eb);
}
} /* !TEACH_STAGE1 */
if (!(ps->flags & PEER_F_TEACH_STAGE2)) {
/* lesson stage 2 not complete */
struct eb32_node *eb;
eb = eb32_lookup_ge(&ps->table->table->updates, ps->pushed+1);
while (1) {
int msglen;
struct stksess *ts;
if (!eb || eb->key > ps->teaching_origin) {
/* flag lesson stage1 complete */
ps->flags |= PEER_F_TEACH_STAGE2;
ps->pushed = ps->teaching_origin;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
msglen = peer_prepare_datamsg(ts, ps, trash.str, trash.size);
if (msglen) {
/* message to buffer */
repl = bi_putblk(si_ic(si), trash.str, msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->lastpush = ps->pushed = ts->upd.key;
}
eb = eb32_next(eb);
}
} /* !TEACH_STAGE2 */
if (!(ps->flags & PEER_F_TEACH_FINISHED)) {
/* process final lesson message */
repl = bi_putchr(si_ic(si), ((ps->table->flags & SHTABLE_RESYNC_STATEMASK) == SHTABLE_RESYNC_FINISHED) ? 'F' : 'C');
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
/* flag finished message sent */
ps->flags |= PEER_F_TEACH_FINISHED;
} /* !TEACH_FINISHED */
} /* TEACH_PROCESS */
if (!(ps->flags & PEER_F_LEARN_ASSIGN) &&
(int)(ps->pushed - ps->table->table->localupdate) < 0) {
/* Push local updates, only if no learning in progress (to avoid ping-pong effects) */
struct eb32_node *eb;
eb = eb32_lookup_ge(&ps->table->table->updates, ps->pushed+1);
while (1) {
int msglen;
struct stksess *ts;
/* push local updates */
if (!eb) {
eb = eb32_first(&ps->table->table->updates);
if (!eb || ((int)(eb->key - ps->pushed) <= 0)) {
ps->pushed = ps->table->table->localupdate;
break;
}
}
if ((int)(eb->key - ps->table->table->localupdate) > 0) {
ps->pushed = ps->table->table->localupdate;
break;
}
ts = eb32_entry(eb, struct stksess, upd);
msglen = peer_prepare_datamsg(ts, ps, trash.str, trash.size);
if (msglen) {
/* message to buffer */
repl = bi_putblk(si_ic(si), trash.str, msglen);
if (repl <= 0) {
/* no more write possible */
if (repl == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
goto switchstate;
}
ps->lastpush = ps->pushed = ts->upd.key;
}
eb = eb32_next(eb);
}
} /* ! LEARN_ASSIGN */
/* noting more to do */
goto out;
}
case PEER_SESS_ST_EXIT:
repl = snprintf(trash.str, trash.size, "%d\n", appctx->st1);
if (bi_putblk(si_ic(si), trash.str, repl) == -1)
goto full;
appctx->st0 = PEER_SESS_ST_END;
/* fall through */
case PEER_SESS_ST_END: {
si_shutw(si);
si_shutr(si);
si_ic(si)->flags |= CF_READ_NULL;
goto out;
}
}
}
out:
si_oc(si)->flags |= CF_READ_DONTWAIT;
return;
full:
si_applet_cant_put(si);
goto out;
}
/* This function is the equivalent to stream_int_update() except that it's
* designed to be called from outside the stream handlers, typically the lower
* layers (applets, connections) after I/O completion. After updating the stream
* interface and timeouts, it will try to forward what can be forwarded, then to
* wake the associated task up if an important event requires special handling.
* It should not be called from within the stream itself, stream_int_update()
* is designed for this.
*/
void stream_int_notify(struct stream_interface *si)
{
struct channel *ic = si_ic(si);
struct channel *oc = si_oc(si);
/* process consumer side */
if (channel_is_empty(oc)) {
if (((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) &&
(si->state == SI_ST_EST))
si_shutw(si);
oc->wex = TICK_ETERNITY;
}
/* indicate that we may be waiting for data from the output channel */
if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && channel_may_recv(oc))
si->flags |= SI_FL_WAIT_DATA;
/* update OC timeouts and wake the other side up if it's waiting for room */
if (oc->flags & CF_WRITE_ACTIVITY) {
if ((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
!channel_is_empty(oc))
if (tick_isset(oc->wex))
oc->wex = tick_add_ifset(now_ms, oc->wto);
if (!(si->flags & SI_FL_INDEP_STR))
if (tick_isset(ic->rex))
ic->rex = tick_add_ifset(now_ms, ic->rto);
if (likely((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
channel_may_recv(oc) &&
(si_opposite(si)->flags & SI_FL_WAIT_ROOM)))
si_chk_rcv(si_opposite(si));
}
/* Notify the other side when we've injected data into the IC that
* needs to be forwarded. We can do fast-forwarding as soon as there
* are output data, but we avoid doing this if some of the data are
* not yet scheduled for being forwarded, because it is very likely
* that it will be done again immediately afterwards once the following
* data are parsed (eg: HTTP chunking). We only SI_FL_WAIT_ROOM once
* we've emptied *some* of the output buffer, and not just when there
* is available room, because applets are often forced to stop before
* the buffer is full. We must not stop based on input data alone because
* an HTTP parser might need more data to complete the parsing.
*/
if (!channel_is_empty(ic) &&
(si_opposite(si)->flags & SI_FL_WAIT_DATA) &&
(ic->buf->i == 0 || ic->pipe)) {
int new_len, last_len;
last_len = ic->buf->o;
if (ic->pipe)
last_len += ic->pipe->data;
si_chk_snd(si_opposite(si));
new_len = ic->buf->o;
if (ic->pipe)
new_len += ic->pipe->data;
/* check if the consumer has freed some space either in the
* buffer or in the pipe.
*/
if (channel_may_recv(ic) && new_len < last_len)
si->flags &= ~SI_FL_WAIT_ROOM;
}
if (si->flags & SI_FL_WAIT_ROOM) {
ic->rex = TICK_ETERNITY;
}
else if ((ic->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ)) == CF_READ_PARTIAL &&
channel_may_recv(ic)) {
/* we must re-enable reading if si_chk_snd() has freed some space */
if (!(ic->flags & CF_READ_NOEXP) && tick_isset(ic->rex))
ic->rex = tick_add_ifset(now_ms, ic->rto);
}
/* wake the task up only when needed */
if (/* changes on the production side */
(ic->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
si->state != SI_ST_EST ||
(si->flags & SI_FL_ERR) ||
((ic->flags & CF_READ_PARTIAL) &&
(!ic->to_forward || si_opposite(si)->state != SI_ST_EST)) ||
/* changes on the consumption side */
(oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
((oc->flags & CF_WRITE_ACTIVITY) &&
((oc->flags & CF_SHUTW) ||
((oc->flags & CF_WAKE_WRITE) &&
(si_opposite(si)->state != SI_ST_EST ||
(channel_is_empty(oc) && !oc->to_forward)))))) {
task_wakeup(si_task(si), TASK_WOKEN_IO);
}
if (ic->flags & CF_READ_ACTIVITY)
ic->flags &= ~CF_READ_DONTWAIT;
stream_release_buffers(si_strm(si));
}