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director.c
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director.c
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/* Copyright (c) 2010-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "ioloop.h"
#include "array.h"
#include "str.h"
#include "strescape.h"
#include "log-throttle.h"
#include "ipc-client.h"
#include "program-client.h"
#include "var-expand.h"
#include "istream.h"
#include "ostream.h"
#include "iostream-temp.h"
#include "mail-user-hash.h"
#include "user-directory.h"
#include "mail-host.h"
#include "director-host.h"
#include "director-connection.h"
#include "director.h"
#define DIRECTOR_IPC_PROXY_PATH "ipc"
#define DIRECTOR_DNS_SOCKET_PATH "dns-client"
#define DIRECTOR_RECONNECT_RETRY_SECS 60
#define DIRECTOR_RECONNECT_TIMEOUT_MSECS (30*1000)
#define DIRECTOR_USER_MOVE_TIMEOUT_MSECS (30*1000)
#define DIRECTOR_SYNC_TIMEOUT_MSECS (5*1000)
#define DIRECTOR_RING_MIN_WAIT_SECS 20
#define DIRECTOR_QUICK_RECONNECT_TIMEOUT_MSECS 1000
#define DIRECTOR_DELAYED_DIR_REMOVE_MSECS (1000*30)
bool director_debug;
const char *user_kill_state_names[USER_KILL_STATE_DELAY+1] = {
"none",
"killing",
"notify-received",
"waiting-for-notify",
"waiting-for-everyone",
"flushing",
"delay",
};
static struct log_throttle *user_move_throttle;
static struct log_throttle *user_kill_fail_throttle;
static const struct log_throttle_settings director_log_throttle_settings = {
.throttle_at_max_per_interval = 100,
.unthrottle_at_max_per_interval = 2,
};
static void
director_user_kill_finish_delayed(struct director *dir, struct user *user,
bool skip_delay);
static bool director_is_self_ip_set(struct director *dir)
{
if (net_ip_compare(&dir->self_ip, &net_ip4_any))
return FALSE;
if (net_ip_compare(&dir->self_ip, &net_ip6_any))
return FALSE;
return TRUE;
}
static void director_find_self_ip(struct director *dir)
{
struct director_host *const *hosts;
unsigned int i, count;
hosts = array_get(&dir->dir_hosts, &count);
for (i = 0; i < count; i++) {
if (net_try_bind(&hosts[i]->ip) == 0) {
dir->self_ip = hosts[i]->ip;
return;
}
}
i_fatal("director_servers doesn't list ourself");
}
void director_find_self(struct director *dir)
{
if (dir->self_host != NULL)
return;
if (!director_is_self_ip_set(dir))
director_find_self_ip(dir);
dir->self_host = director_host_lookup(dir, &dir->self_ip,
dir->self_port);
if (dir->self_host == NULL) {
i_fatal("director_servers doesn't list ourself (%s:%u)",
net_ip2addr(&dir->self_ip), dir->self_port);
}
dir->self_host->self = TRUE;
}
static unsigned int director_find_self_idx(struct director *dir)
{
struct director_host *const *hosts;
unsigned int i, count;
i_assert(dir->self_host != NULL);
hosts = array_get(&dir->dir_hosts, &count);
for (i = 0; i < count; i++) {
if (hosts[i] == dir->self_host)
return i;
}
i_unreached();
}
static bool
director_has_outgoing_connection(struct director *dir,
struct director_host *host)
{
struct director_connection *const *connp;
array_foreach(&dir->connections, connp) {
if (director_connection_get_host(*connp) == host &&
!director_connection_is_incoming(*connp))
return TRUE;
}
return FALSE;
}
int director_connect_host(struct director *dir, struct director_host *host)
{
in_port_t port;
int fd;
if (director_has_outgoing_connection(dir, host))
return 0;
if (director_debug) {
string_t *str = t_str_new(128);
str_printfa(str, "Connecting to %s:%u (as %s",
net_ip2addr(&host->ip), host->port,
net_ip2addr(&dir->self_ip));
if (host->last_network_failure > 0) {
str_printfa(str, ", last network failure %ds ago",
(int)(ioloop_time - host->last_network_failure));
}
if (host->last_protocol_failure > 0) {
str_printfa(str, ", last protocol failure %ds ago",
(int)(ioloop_time - host->last_protocol_failure));
}
dir_debug("%s", str_c(str));
}
port = dir->test_port != 0 ? dir->test_port : host->port;
fd = net_connect_ip(&host->ip, port, &dir->self_ip);
if (fd == -1) {
host->last_network_failure = ioloop_time;
i_error("connect(%s) failed: %m", host->name);
return -1;
}
/* Reset timestamp so that director_connect() won't skip this host
while we're still trying to connect to it */
host->last_network_failure = 0;
(void)director_connection_init_out(dir, fd, host);
return 0;
}
static struct director_host *
director_get_preferred_right_host(struct director *dir)
{
struct director_host *const *hosts, *host;
unsigned int i, count, self_idx;
hosts = array_get(&dir->dir_hosts, &count);
if (count == 1) {
/* self */
return NULL;
}
self_idx = director_find_self_idx(dir);
for (i = 0; i < count; i++) {
host = hosts[(self_idx + i + 1) % count];
if (!host->removed)
return host;
}
/* self, with some removed hosts */
return NULL;
}
static bool director_wait_for_others(struct director *dir)
{
struct director_host *const *hostp;
/* don't assume we're alone until we've attempted to connect
to others for a while */
if (dir->ring_first_alone != 0 &&
ioloop_time - dir->ring_first_alone > DIRECTOR_RING_MIN_WAIT_SECS)
return FALSE;
if (dir->ring_first_alone == 0)
dir->ring_first_alone = ioloop_time;
/* reset all failures and try again */
array_foreach(&dir->dir_hosts, hostp) {
(*hostp)->last_network_failure = 0;
(*hostp)->last_protocol_failure = 0;
}
if (dir->to_reconnect != NULL)
timeout_remove(&dir->to_reconnect);
dir->to_reconnect = timeout_add(DIRECTOR_QUICK_RECONNECT_TIMEOUT_MSECS,
director_connect, dir);
return TRUE;
}
void director_connect(struct director *dir)
{
struct director_host *const *hosts;
unsigned int i, count, self_idx;
self_idx = director_find_self_idx(dir);
/* try to connect to first working server on our right side.
the left side is supposed to connect to us. */
hosts = array_get(&dir->dir_hosts, &count);
for (i = 1; i < count; i++) {
unsigned int idx = (self_idx + i) % count;
if (hosts[idx]->removed)
continue;
if (hosts[idx]->last_network_failure +
DIRECTOR_RECONNECT_RETRY_SECS > ioloop_time) {
/* connection failed recently, don't try retrying here */
continue;
}
if (hosts[idx]->last_protocol_failure +
DIRECTOR_PROTOCOL_FAILURE_RETRY_SECS > ioloop_time) {
/* the director recently sent invalid protocol data,
don't try retrying yet */
continue;
}
if (director_connect_host(dir, hosts[idx]) == 0) {
/* success */
return;
}
}
if (count > 1 && director_wait_for_others(dir))
return;
/* we're the only one */
if (count > 1) {
i_warning("director: Couldn't connect to right side, "
"we must be the only director left");
}
if (dir->left != NULL) {
/* since we couldn't connect to it,
it must have failed recently */
i_warning("director: Assuming %s is dead, disconnecting",
director_connection_get_name(dir->left));
director_connection_deinit(&dir->left,
"This connection is dead?");
}
dir->ring_min_version = DIRECTOR_VERSION_MINOR;
if (!dir->ring_handshaked)
director_set_ring_handshaked(dir);
else
director_set_ring_synced(dir);
}
void director_set_ring_handshaked(struct director *dir)
{
i_assert(!dir->ring_handshaked);
if (dir->to_handshake_warning != NULL)
timeout_remove(&dir->to_handshake_warning);
if (dir->ring_handshake_warning_sent) {
i_warning("Directors have been connected, "
"continuing delayed requests");
dir->ring_handshake_warning_sent = FALSE;
}
dir_debug("Director ring handshaked");
dir->ring_handshaked = TRUE;
director_set_ring_synced(dir);
}
static void director_reconnect_timeout(struct director *dir)
{
struct director_host *cur_host, *preferred_host =
director_get_preferred_right_host(dir);
cur_host = dir->right == NULL ? NULL :
director_connection_get_host(dir->right);
if (preferred_host == NULL) {
/* all directors have been removed, try again later */
} else if (cur_host != preferred_host)
(void)director_connect_host(dir, preferred_host);
else {
/* the connection hasn't finished sync yet.
keep this timeout for now. */
}
}
void director_set_ring_synced(struct director *dir)
{
struct director_host *host;
i_assert(!dir->ring_synced);
i_assert((dir->left != NULL && dir->right != NULL) ||
(dir->left == NULL && dir->right == NULL));
if (dir->to_handshake_warning != NULL)
timeout_remove(&dir->to_handshake_warning);
if (dir->ring_handshake_warning_sent) {
i_warning("Ring is synced, continuing delayed requests "
"(syncing took %d secs, hosts_hash=%u)",
(int)(ioloop_time - dir->ring_last_sync_time),
mail_hosts_hash(dir->mail_hosts));
dir->ring_handshake_warning_sent = FALSE;
}
host = dir->right == NULL ? NULL :
director_connection_get_host(dir->right);
if (dir->to_reconnect != NULL)
timeout_remove(&dir->to_reconnect);
if (host != director_get_preferred_right_host(dir)) {
/* try to reconnect to preferred host later */
dir->to_reconnect =
timeout_add(DIRECTOR_RECONNECT_TIMEOUT_MSECS,
director_reconnect_timeout, dir);
}
if (dir->left != NULL)
director_connection_set_synced(dir->left, TRUE);
if (dir->right != NULL)
director_connection_set_synced(dir->right, TRUE);
if (dir->to_sync != NULL)
timeout_remove(&dir->to_sync);
dir->ring_synced = TRUE;
dir->ring_last_sync_time = ioloop_time;
mail_hosts_set_synced(dir->mail_hosts);
director_set_state_changed(dir);
}
void director_sync_send(struct director *dir, struct director_host *host,
uint32_t seq, unsigned int minor_version,
unsigned int timestamp, unsigned int hosts_hash)
{
string_t *str;
if (host == dir->self_host)
dir->last_sync_sent_ring_change_counter = dir->ring_change_counter;
str = t_str_new(128);
str_printfa(str, "SYNC\t%s\t%u\t%u",
net_ip2addr(&host->ip), host->port, seq);
if (minor_version > 0 &&
director_connection_get_minor_version(dir->right) > 0) {
/* only minor_version>0 supports extra parameters */
str_printfa(str, "\t%u\t%u\t%u", minor_version,
timestamp, hosts_hash);
}
str_append_c(str, '\n');
director_connection_send(dir->right, str_c(str));
/* ping our connections in case either of them are hanging.
if they are, we want to know it fast. */
if (dir->left != NULL)
director_connection_ping(dir->left);
director_connection_ping(dir->right);
}
bool director_resend_sync(struct director *dir)
{
if (!dir->ring_synced && dir->left != NULL && dir->right != NULL) {
/* send a new SYNC in case the previous one got dropped */
dir->self_host->last_sync_timestamp = ioloop_time;
director_sync_send(dir, dir->self_host, dir->sync_seq,
DIRECTOR_VERSION_MINOR, ioloop_time,
mail_hosts_hash(dir->mail_hosts));
if (dir->to_sync != NULL)
timeout_reset(dir->to_sync);
return TRUE;
}
return FALSE;
}
static void director_sync_timeout(struct director *dir)
{
i_assert(!dir->ring_synced);
if (director_resend_sync(dir))
i_error("Ring SYNC appears to have got lost, resending");
}
void director_set_ring_unsynced(struct director *dir)
{
if (dir->ring_synced) {
dir->ring_synced = FALSE;
dir->ring_last_sync_time = ioloop_time;
}
if (dir->to_sync == NULL) {
dir->to_sync = timeout_add(DIRECTOR_SYNC_TIMEOUT_MSECS,
director_sync_timeout, dir);
} else {
timeout_reset(dir->to_sync);
}
}
static void director_sync(struct director *dir)
{
/* we're synced again when we receive this SYNC back */
dir->sync_seq++;
if (dir->right == NULL && dir->left == NULL) {
/* we're alone. if we're already synced,
don't become unsynced. */
return;
}
director_set_ring_unsynced(dir);
if (dir->sync_frozen) {
dir->sync_pending = TRUE;
return;
}
if (dir->right == NULL) {
i_assert(!dir->ring_synced ||
(dir->left == NULL && dir->right == NULL));
return;
}
dir_debug("Ring is desynced (seq=%u, sending SYNC to %s)",
dir->sync_seq, dir->right == NULL ? "(nowhere)" :
director_connection_get_name(dir->right));
/* send PINGs to our connections more rapidly until we've synced again.
if the connection has actually died, we don't need to wait (and
delay requests) for as long to detect it */
if (dir->left != NULL)
director_connection_set_synced(dir->left, FALSE);
director_connection_set_synced(dir->right, FALSE);
director_sync_send(dir, dir->self_host, dir->sync_seq,
DIRECTOR_VERSION_MINOR, ioloop_time,
mail_hosts_hash(dir->mail_hosts));
}
void director_sync_freeze(struct director *dir)
{
struct director_connection *const *connp;
i_assert(!dir->sync_frozen);
i_assert(!dir->sync_pending);
array_foreach(&dir->connections, connp)
director_connection_cork(*connp);
dir->sync_frozen = TRUE;
}
void director_sync_thaw(struct director *dir)
{
struct director_connection *const *connp;
i_assert(dir->sync_frozen);
dir->sync_frozen = FALSE;
if (dir->sync_pending) {
dir->sync_pending = FALSE;
director_sync(dir);
}
array_foreach(&dir->connections, connp)
director_connection_uncork(*connp);
}
void director_notify_ring_added(struct director_host *added_host,
struct director_host *src)
{
const char *cmd;
added_host->dir->ring_change_counter++;
cmd = t_strdup_printf("DIRECTOR\t%s\t%u\n",
net_ip2addr(&added_host->ip), added_host->port);
director_update_send(added_host->dir, src, cmd);
}
static void director_delayed_dir_remove_timeout(struct director *dir)
{
struct director_host *const *hosts, *host;
unsigned int i, count;
timeout_remove(&dir->to_remove_dirs);
hosts = array_get(&dir->dir_hosts, &count);
for (i = 0; i < count; ) {
if (hosts[i]->removed) {
host = hosts[i];
director_host_free(&host);
hosts = array_get(&dir->dir_hosts, &count);
} else {
i++;
}
}
}
void director_ring_remove(struct director_host *removed_host,
struct director_host *src)
{
struct director *dir = removed_host->dir;
struct director_connection *const *conns, *conn;
unsigned int i, count;
const char *cmd;
if (removed_host->self) {
/* others will just disconnect us */
return;
}
/* mark the host as removed and fully remove it later. this delay is
needed, because the removal may trigger director reconnections,
which may send the director back and we don't want to re-add it */
removed_host->removed = TRUE;
if (dir->to_remove_dirs == NULL) {
dir->to_remove_dirs =
timeout_add(DIRECTOR_DELAYED_DIR_REMOVE_MSECS,
director_delayed_dir_remove_timeout, dir);
}
/* disconnect any connections to the host */
conns = array_get(&dir->connections, &count);
for (i = 0; i < count; ) {
conn = conns[i];
if (director_connection_get_host(conn) != removed_host)
i++;
else {
director_connection_deinit(&conn, "Removing from ring");
conns = array_get(&dir->connections, &count);
}
}
if (dir->right == NULL)
director_connect(dir);
cmd = t_strdup_printf("DIRECTOR-REMOVE\t%s\t%u\n",
net_ip2addr(&removed_host->ip),
removed_host->port);
director_update_send_version(dir, src,
DIRECTOR_VERSION_RING_REMOVE, cmd);
}
static void
director_send_host(struct director *dir, struct director_host *src,
struct director_host *orig_src,
struct mail_host *host)
{
const char *host_tag = mail_host_get_tag(host);
string_t *str;
if (orig_src == NULL) {
orig_src = dir->self_host;
orig_src->last_seq++;
}
str = t_str_new(128);
str_printfa(str, "HOST\t%s\t%u\t%u\t%s\t%u",
net_ip2addr(&orig_src->ip), orig_src->port,
orig_src->last_seq,
net_ip2addr(&host->ip), host->vhost_count);
if (dir->ring_min_version >= DIRECTOR_VERSION_TAGS_V2) {
str_append_c(str, '\t');
str_append_tabescaped(str, host_tag);
} else if (host_tag[0] != '\0' &&
dir->ring_min_version < DIRECTOR_VERSION_TAGS_V2) {
if (dir->ring_min_version < DIRECTOR_VERSION_TAGS) {
i_error("Ring has directors that don't support tags - removing host %s with tag '%s'",
net_ip2addr(&host->ip), host_tag);
} else {
i_error("Ring has directors that support mixed versions of tags - removing host %s with tag '%s'",
net_ip2addr(&host->ip), host_tag);
}
director_remove_host(dir, NULL, NULL, host);
return;
}
if (dir->ring_min_version >= DIRECTOR_VERSION_UPDOWN) {
str_printfa(str, "\t%c%ld\t", host->down ? 'D' : 'U',
(long)host->last_updown_change);
/* add any further version checks here - these directors ignore
any extra unknown arguments */
if (host->hostname != NULL)
str_append_tabescaped(str, host->hostname);
}
str_append_c(str, '\n');
director_update_send(dir, src, str_c(str));
}
void director_resend_hosts(struct director *dir)
{
struct mail_host *const *hostp;
array_foreach(mail_hosts_get(dir->mail_hosts), hostp)
director_send_host(dir, dir->self_host, NULL, *hostp);
}
void director_update_host(struct director *dir, struct director_host *src,
struct director_host *orig_src,
struct mail_host *host)
{
/* update state in case this is the first mail host being added */
director_set_state_changed(dir);
dir_debug("Updating host %s vhost_count=%u "
"down=%d last_updown_change=%ld (hosts_hash=%u)",
net_ip2addr(&host->ip), host->vhost_count, host->down ? 1 : 0,
(long)host->last_updown_change,
mail_hosts_hash(dir->mail_hosts));
director_send_host(dir, src, orig_src, host);
/* mark the host desynced until ring is synced again. except if we're
alone in the ring that never happens. */
if (dir->right != NULL || dir->left != NULL)
host->desynced = TRUE;
director_sync(dir);
}
void director_remove_host(struct director *dir, struct director_host *src,
struct director_host *orig_src,
struct mail_host *host)
{
struct user_directory *users = host->tag->users;
if (src != NULL) {
if (orig_src == NULL) {
orig_src = dir->self_host;
orig_src->last_seq++;
}
director_update_send(dir, src, t_strdup_printf(
"HOST-REMOVE\t%s\t%u\t%u\t%s\n",
net_ip2addr(&orig_src->ip), orig_src->port,
orig_src->last_seq, net_ip2addr(&host->ip)));
}
user_directory_remove_host(users, host);
mail_host_remove(host);
director_sync(dir);
}
void director_flush_host(struct director *dir, struct director_host *src,
struct director_host *orig_src,
struct mail_host *host)
{
struct user_directory *users = host->tag->users;
if (orig_src == NULL) {
orig_src = dir->self_host;
orig_src->last_seq++;
}
director_update_send(dir, src, t_strdup_printf(
"HOST-FLUSH\t%s\t%u\t%u\t%s\n",
net_ip2addr(&orig_src->ip), orig_src->port, orig_src->last_seq,
net_ip2addr(&host->ip)));
user_directory_remove_host(users, host);
director_sync(dir);
}
void director_update_user(struct director *dir, struct director_host *src,
struct user *user)
{
i_assert(src != NULL);
i_assert(!user->weak);
director_update_send(dir, src, t_strdup_printf("USER\t%u\t%s\n",
user->username_hash, net_ip2addr(&user->host->ip)));
}
void director_update_user_weak(struct director *dir, struct director_host *src,
struct director_connection *src_conn,
struct director_host *orig_src,
struct user *user)
{
const char *cmd;
i_assert(src != NULL);
i_assert(user->weak);
if (orig_src == NULL) {
orig_src = dir->self_host;
orig_src->last_seq++;
}
cmd = t_strdup_printf("USER-WEAK\t%s\t%u\t%u\t%u\t%s\n",
net_ip2addr(&orig_src->ip), orig_src->port, orig_src->last_seq,
user->username_hash, net_ip2addr(&user->host->ip));
if (src != dir->self_host && dir->left != NULL && dir->right != NULL &&
director_connection_get_host(dir->left) ==
director_connection_get_host(dir->right)) {
/* only two directors in this ring and we're forwarding
USER-WEAK from one director back to itself via another
so it sees we've received it. we can't use
director_update_send() for this, because it doesn't send
data back to the source. */
if (dir->right == src_conn)
director_connection_send(dir->left, cmd);
else if (dir->left == src_conn)
director_connection_send(dir->right, cmd);
else
i_unreached();
} else {
director_update_send(dir, src, cmd);
}
}
static void
director_flush_user_continue(int result, struct director_kill_context *ctx)
{
struct director *dir = ctx->dir;
ctx->callback_pending = FALSE;
struct user *user = user_directory_lookup(ctx->tag->users,
ctx->username_hash);
if (result == 0) {
struct istream *is = iostream_temp_finish(&ctx->reply, (size_t)-1);
char *data;
i_stream_set_return_partial_line(is, TRUE);
data = i_stream_read_next_line(is);
i_error("%s: Failed to flush user hash %u in host %s: %s",
ctx->socket_path,
ctx->username_hash,
net_ip2addr(&ctx->host_ip),
data == NULL ? "(no output to stdout)" : data);
while((data = i_stream_read_next_line(is)) != NULL) {
i_error("%s: Failed to flush user hash %u in host %s: %s",
ctx->socket_path,
ctx->username_hash,
net_ip2addr(&ctx->host_ip),
data);
}
i_stream_unref(&is);
} else {
o_stream_unref(&ctx->reply);
}
program_client_destroy(&ctx->pclient);
if (!DIRECTOR_KILL_CONTEXT_IS_VALID(user, ctx)) {
/* user was already freed - ignore */
dir_debug("User %u freed while flushing, result=%d",
ctx->username_hash, result);
i_assert(ctx->to_move == NULL);
i_free(ctx);
} else {
/* ctx is freed later via user->kill_ctx */
dir_debug("Flushing user %u finished, result=%d",
ctx->username_hash, result);
director_user_kill_finish_delayed(dir, user, result == 1);
}
}
static void
director_flush_user(struct director *dir, struct user *user)
{
struct director_kill_context *ctx = user->kill_ctx;
struct var_expand_table tab[] = {
{ 'i', net_ip2addr(&user->host->ip), "ip" },
{ 'h', user->host->hostname, "host" },
{ '\0', NULL, NULL }
};
const char *error;
/* Execute flush script, if set. Only the director that started the
user moving will call the flush script. Having each director do it
would be redundant since they're all supposed to be performing the
same flush task to the same backend.
Flushing is also not triggered if we're moving a user that we just
created due to the user move. This means that the user doesn't have
an old host, so we couldn't really even perform any flushing on the
backend. */
if (*dir->set->director_flush_socket == '\0' ||
ctx->old_host_ip.family == 0 ||
!ctx->kill_is_self_initiated) {
director_user_kill_finish_delayed(dir, user, FALSE);
return;
}
ctx->host_ip = user->host->ip;
string_t *s_sock = str_new(default_pool, 32);
if (var_expand(s_sock, dir->set->director_flush_socket, tab, &error) <= 0) {
i_error("Failed to expand director_flush_socket=%s: %s",
dir->set->director_flush_socket, error);
director_user_kill_finish_delayed(dir, user, FALSE);
return;
}
ctx->socket_path = str_free_without_data(&s_sock);
struct program_client_settings set = {
.client_connect_timeout_msecs = 10000,
.dns_client_socket_path = DIRECTOR_DNS_SOCKET_PATH,
};
restrict_access_init(&set.restrict_set);
const char *const args[] = {
"FLUSH",
t_strdup_printf("%u", user->username_hash),
net_ip2addr(&ctx->old_host_ip),
net_ip2addr(&user->host->ip),
NULL
};
ctx->kill_state = USER_KILL_STATE_FLUSHING;
dir_debug("Flushing user %u via %s", user->username_hash,
ctx->socket_path);
if ((program_client_create(ctx->socket_path, args, &set, FALSE,
&ctx->pclient, &error)) != 0) {
i_error("%s: Failed to flush user hash %u in host %s: %s",
ctx->socket_path,
user->username_hash,
net_ip2addr(&user->host->ip),
error);
director_flush_user_continue(0, ctx);
return;
}
ctx->reply =
iostream_temp_create_named("/tmp", 0,
t_strdup_printf("flush response from %s",
net_ip2addr(&user->host->ip)));
o_stream_set_no_error_handling(ctx->reply, TRUE);
program_client_set_output(ctx->pclient, ctx->reply);
ctx->callback_pending = TRUE;
program_client_run_async(ctx->pclient, director_flush_user_continue, ctx);
}
static void director_user_move_free(struct user *user)
{
struct director *dir = user->kill_ctx->dir;
struct director_kill_context *kill_ctx = user->kill_ctx;
i_assert(kill_ctx != NULL);
dir_debug("User %u move finished at state=%s", user->username_hash,
user_kill_state_names[kill_ctx->kill_state]);
if (kill_ctx->to_move != NULL)
timeout_remove(&kill_ctx->to_move);
i_free(kill_ctx->socket_path);
i_free(kill_ctx);
user->kill_ctx = NULL;
i_assert(dir->users_moving_count > 0);
dir->users_moving_count--;
dir->state_change_callback(dir);
}
static void
director_user_kill_finish_delayed_to(struct user *user)
{
i_assert(user->kill_ctx != NULL);
i_assert(user->kill_ctx->kill_state == USER_KILL_STATE_DELAY);
director_user_move_free(user);
}
static void
director_user_kill_finish_delayed(struct director *dir, struct user *user,
bool skip_delay)
{
if (skip_delay) {
user->kill_ctx->kill_state = USER_KILL_STATE_NONE;
director_user_move_free(user);
return;
}
user->kill_ctx->kill_state = USER_KILL_STATE_DELAY;
/* wait for a while for the kills to finish in the backend server,
so there are no longer any processes running for the user before we
start letting new in connections to the new server. */
timeout_remove(&user->kill_ctx->to_move);
user->kill_ctx->to_move =
timeout_add(dir->set->director_user_kick_delay * 1000,
director_user_kill_finish_delayed_to, user);
}
static void
director_finish_user_kill(struct director *dir, struct user *user, bool self)
{
struct director_kill_context *kill_ctx = user->kill_ctx;
i_assert(kill_ctx != NULL);
i_assert(kill_ctx->kill_state != USER_KILL_STATE_FLUSHING);
i_assert(kill_ctx->kill_state != USER_KILL_STATE_DELAY);
if (dir->right == NULL) {
/* we're alone */
director_flush_user(dir, user);
} else if (self ||
kill_ctx->kill_state == USER_KILL_STATE_KILLING_NOTIFY_RECEIVED) {
director_connection_send(dir->right, t_strdup_printf(
"USER-KILLED\t%u\n", user->username_hash));
kill_ctx->kill_state = USER_KILL_STATE_KILLED_WAITING_FOR_EVERYONE;
} else {
i_assert(kill_ctx->kill_state == USER_KILL_STATE_KILLING);
kill_ctx->kill_state = USER_KILL_STATE_KILLED_WAITING_FOR_NOTIFY;
}
}
static void director_user_kill_fail_throttled(unsigned int new_events_count,
void *context ATTR_UNUSED)
{
i_error("Failed to kill %u users' connections", new_events_count);
}
static void director_kill_user_callback(enum ipc_client_cmd_state state,
const char *data, void *context)
{
struct director_kill_context *ctx = context;
struct user *user;
/* this is an asynchronous notification about user being killed.
there are no guarantees about what might have happened to the user
in the mean time. */
switch (state) {
case IPC_CLIENT_CMD_STATE_REPLY:
/* shouldn't get here. the command reply isn't finished yet. */
return;
case IPC_CLIENT_CMD_STATE_OK:
break;
case IPC_CLIENT_CMD_STATE_ERROR:
if (log_throttle_accept(user_kill_fail_throttle)) {
i_error("Failed to kill user %u connections: %s",
ctx->username_hash, data);
}
/* we can't really do anything but continue anyway */
break;
}
ctx->callback_pending = FALSE;
user = user_directory_lookup(ctx->tag->users, ctx->username_hash);
if (!DIRECTOR_KILL_CONTEXT_IS_VALID(user, ctx)) {
/* user was already freed - ignore */
i_assert(ctx->to_move == NULL);
i_free(ctx);
} else {
i_assert(ctx->kill_state == USER_KILL_STATE_KILLING ||
ctx->kill_state == USER_KILL_STATE_KILLING_NOTIFY_RECEIVED);
/* we were still waiting for the kill notification */
director_finish_user_kill(ctx->dir, user, ctx->kill_is_self_initiated);
}
}
static void director_user_move_throttled(unsigned int new_events_count,
void *context ATTR_UNUSED)
{
i_error("%u users' move timed out, their state may now be inconsistent",
new_events_count);
}
static void director_user_move_timeout(struct user *user)
{
i_assert(user->kill_ctx != NULL);
i_assert(user->kill_ctx->kill_state != USER_KILL_STATE_DELAY);
if (log_throttle_accept(user_move_throttle)) {
i_error("Finishing user %u move timed out, "
"its state may now be inconsistent (state=%s)",
user->username_hash,
user_kill_state_names[user->kill_ctx->kill_state]);
}
if (user->kill_ctx->kill_state == USER_KILL_STATE_FLUSHING) {
o_stream_unref(&user->kill_ctx->reply);
program_client_destroy(&user->kill_ctx->pclient);
}
director_user_move_free(user);
}
static void
director_kill_user(struct director *dir, struct director_host *src,
struct user *user, struct mail_tag *tag,
struct mail_host *old_host)
{
struct director_kill_context *ctx;
const char *cmd;
if (USER_IS_BEING_KILLED(user)) {
/* User is being moved again before the previous move
finished. We'll just continue wherever we left off
earlier. */
dir_debug("User %u move restarted - previous kill_state=%s",
user->username_hash,
user_kill_state_names[user->kill_ctx->kill_state]);
return;
}