/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "istream.h"
#include "dsync-ibc.h"
#include "dsync-mail.h"
#include "dsync-mailbox-import.h"
#include "dsync-mailbox-export.h"
#include "dsync-brain-private.h"
const char *dsync_box_state_names[DSYNC_BOX_STATE_DONE+1] = {
"mailbox",
"changes",
"attributes",
"mail_requests",
"mails",
"recv_last_common",
"done"
};
static bool dsync_brain_master_sync_recv_mailbox(struct dsync_brain *brain)
{
const struct dsync_mailbox *dsync_box;
const char *resync_reason;
enum dsync_ibc_recv_ret ret;
bool resync;
i_assert(brain->master_brain);
if ((ret = dsync_ibc_recv_mailbox(brain->ibc, &dsync_box)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
i_error("Remote sent end-of-list instead of a mailbox");
brain->failed = TRUE;
return TRUE;
}
if (memcmp(dsync_box->mailbox_guid, brain->local_dsync_box.mailbox_guid,
sizeof(dsync_box->mailbox_guid)) != 0) {
i_error("Remote sent mailbox with a wrong GUID");
brain->failed = TRUE;
return TRUE;
}
if (dsync_box->mailbox_ignore) {
/* ignore this box */
if (brain->debug)
i_debug("brain %c: Ignoring missing remote box GUID %s",
brain->master_brain ? 'M' : 'S',
guid_128_to_string(dsync_box->mailbox_guid));
dsync_brain_sync_mailbox_deinit(brain);
return TRUE;
}
if (dsync_box->mailbox_lost) {
/* remote lost the mailbox. it's probably already deleted, but
verify it on next sync just to be sure */
dsync_brain_set_changes_during_sync(brain, t_strdup_printf(
"Remote lost mailbox GUID %s (maybe it was just deleted?)",
guid_128_to_string(dsync_box->mailbox_guid)));
brain->require_full_resync = TRUE;
dsync_brain_sync_mailbox_deinit(brain);
return TRUE;
}
resync = !dsync_brain_mailbox_update_pre(brain, brain->box,
&brain->local_dsync_box,
dsync_box, &resync_reason);
if (!dsync_boxes_need_sync(brain, &brain->local_dsync_box, dsync_box)) {
/* no fields appear to have changed, skip this mailbox */
dsync_brain_sync_mailbox_deinit(brain);
return TRUE;
}
if ((ret = dsync_brain_sync_mailbox_open(brain, dsync_box)) < 0)
return TRUE;
if (resync)
dsync_brain_set_changes_during_sync(brain, resync_reason);
if (ret == 0 || resync) {
brain->require_full_resync = TRUE;
brain->failed = TRUE;
dsync_brain_sync_mailbox_deinit(brain);
return TRUE;
}
dsync_brain_sync_init_box_states(brain);
return TRUE;
}
static bool dsync_brain_recv_mailbox_attribute(struct dsync_brain *brain)
{
const struct dsync_mailbox_attribute *attr;
struct istream *input;
enum dsync_ibc_recv_ret ret;
if ((ret = dsync_ibc_recv_mailbox_attribute(brain->ibc, &attr)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
brain->box_recv_state = DSYNC_BOX_STATE_CHANGES;
return TRUE;
}
if (dsync_mailbox_import_attribute(brain->box_importer, attr) < 0)
brain->failed = TRUE;
input = attr->value_stream;
i_stream_unref(&input);
return TRUE;
}
static void dsync_brain_send_end_of_list(struct dsync_brain *brain,
enum dsync_ibc_eol_type type)
{
i_assert(!brain->failed);
dsync_ibc_send_end_of_list(brain->ibc, type);
}
static int dsync_brain_export_deinit(struct dsync_brain *brain)
{
const char *errstr;
enum mail_error error;
if (dsync_mailbox_export_deinit(&brain->box_exporter,
&errstr, &error) < 0) {
i_error("Exporting mailbox %s failed: %s",
mailbox_get_vname(brain->box), errstr);
brain->mail_error = error;
brain->failed = TRUE;
return -1;
}
return 0;
}
static void dsync_brain_send_mailbox_attribute(struct dsync_brain *brain)
{
const struct dsync_mailbox_attribute *attr;
int ret;
while ((ret = dsync_mailbox_export_next_attr(brain->box_exporter, &attr)) > 0) {
if (dsync_ibc_send_mailbox_attribute(brain->ibc, attr) == 0)
return;
}
if (ret < 0) {
if (dsync_brain_export_deinit(brain) == 0)
i_unreached();
return;
}
dsync_brain_send_end_of_list(brain, DSYNC_IBC_EOL_MAILBOX_ATTRIBUTE);
brain->box_send_state = DSYNC_BOX_STATE_CHANGES;
}
static bool dsync_brain_recv_mail_change(struct dsync_brain *brain)
{
const struct dsync_mail_change *change;
enum dsync_ibc_recv_ret ret;
if ((ret = dsync_ibc_recv_change(brain->ibc, &change)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
if (dsync_mailbox_import_changes_finish(brain->box_importer) < 0)
brain->failed = TRUE;
if (brain->mail_requests && brain->box_exporter != NULL)
brain->box_recv_state = DSYNC_BOX_STATE_MAIL_REQUESTS;
else
brain->box_recv_state = DSYNC_BOX_STATE_MAILS;
return TRUE;
}
if (dsync_mailbox_import_change(brain->box_importer, change) < 0)
brain->failed = TRUE;
return TRUE;
}
static void dsync_brain_send_mail_change(struct dsync_brain *brain)
{
const struct dsync_mail_change *change;
int ret;
while ((ret = dsync_mailbox_export_next(brain->box_exporter, &change)) > 0) {
if (dsync_ibc_send_change(brain->ibc, change) == 0)
return;
}
if (ret < 0) {
if (dsync_brain_export_deinit(brain) == 0)
i_unreached();
return;
}
dsync_brain_send_end_of_list(brain, DSYNC_IBC_EOL_MAIL_CHANGES);
if (brain->mail_requests && brain->box_importer != NULL)
brain->box_send_state = DSYNC_BOX_STATE_MAIL_REQUESTS;
else
brain->box_send_state = DSYNC_BOX_STATE_MAILS;
}
static bool dsync_brain_recv_mail_request(struct dsync_brain *brain)
{
const struct dsync_mail_request *request;
enum dsync_ibc_recv_ret ret;
i_assert(brain->mail_requests);
i_assert(brain->box_exporter != NULL);
if ((ret = dsync_ibc_recv_mail_request(brain->ibc, &request)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
brain->box_recv_state = brain->box_importer != NULL ?
DSYNC_BOX_STATE_MAILS :
DSYNC_BOX_STATE_RECV_LAST_COMMON;
return TRUE;
}
dsync_mailbox_export_want_mail(brain->box_exporter, request);
return TRUE;
}
static bool dsync_brain_send_mail_request(struct dsync_brain *brain)
{
const struct dsync_mail_request *request;
i_assert(brain->mail_requests);
while ((request = dsync_mailbox_import_next_request(brain->box_importer)) != NULL) {
if (dsync_ibc_send_mail_request(brain->ibc, request) == 0)
return TRUE;
}
if (brain->box_recv_state < DSYNC_BOX_STATE_MAIL_REQUESTS)
return FALSE;
dsync_brain_send_end_of_list(brain, DSYNC_IBC_EOL_MAIL_REQUESTS);
if (brain->box_exporter != NULL)
brain->box_send_state = DSYNC_BOX_STATE_MAILS;
else {
i_assert(brain->box_recv_state != DSYNC_BOX_STATE_DONE);
brain->box_send_state = DSYNC_BOX_STATE_DONE;
}
return TRUE;
}
static void dsync_brain_sync_half_finished(struct dsync_brain *brain)
{
struct dsync_mailbox_state state;
const char *changes_during_sync;
bool require_full_resync;
if (brain->box_recv_state < DSYNC_BOX_STATE_RECV_LAST_COMMON ||
brain->box_send_state < DSYNC_BOX_STATE_RECV_LAST_COMMON)
return;
/* finished with this mailbox */
i_zero(&state);
memcpy(state.mailbox_guid, brain->local_dsync_box.mailbox_guid,
sizeof(state.mailbox_guid));
state.last_uidvalidity = brain->local_dsync_box.uid_validity;
if (brain->box_importer == NULL) {
/* this mailbox didn't exist on remote */
state.last_common_uid = brain->local_dsync_box.uid_next-1;
state.last_common_modseq =
brain->local_dsync_box.highest_modseq;
state.last_common_pvt_modseq =
brain->local_dsync_box.highest_pvt_modseq;
state.last_messages_count =
brain->local_dsync_box.messages_count;
} else {
if (dsync_mailbox_import_deinit(&brain->box_importer,
!brain->failed,
&state.last_common_uid,
&state.last_common_modseq,
&state.last_common_pvt_modseq,
&state.last_messages_count,
&changes_during_sync,
&require_full_resync,
&brain->mail_error) < 0) {
if (require_full_resync) {
/* don't treat this as brain failure or the
state won't be sent to the other brain.
this also means we'll continue syncing the
following mailboxes. */
brain->require_full_resync = TRUE;
} else {
brain->failed = TRUE;
}
}
if (changes_during_sync != NULL) {
state.changes_during_sync = TRUE;
dsync_brain_set_changes_during_sync(brain, changes_during_sync);
}
}
if (brain->require_full_resync) {
state.last_uidvalidity = 0;
state.changes_during_sync = TRUE;
}
brain->mailbox_state = state;
dsync_ibc_send_mailbox_state(brain->ibc, &state);
}
static bool dsync_brain_recv_mail(struct dsync_brain *brain)
{
struct dsync_mail *mail;
enum dsync_ibc_recv_ret ret;
if ((ret = dsync_ibc_recv_mail(brain->ibc, &mail)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
brain->box_recv_state = DSYNC_BOX_STATE_RECV_LAST_COMMON;
if (brain->box_exporter != NULL &&
brain->box_send_state >= DSYNC_BOX_STATE_RECV_LAST_COMMON) {
if (dsync_brain_export_deinit(brain) < 0)
return TRUE;
}
dsync_brain_sync_half_finished(brain);
return TRUE;
}
if (brain->debug) {
i_debug("brain %c: import mail uid %u guid %s",
brain->master_brain ? 'M' : 'S', mail->uid, mail->guid);
}
if (dsync_mailbox_import_mail(brain->box_importer, mail) < 0)
brain->failed = TRUE;
i_stream_unref(&mail->input);
return TRUE;
}
static bool dsync_brain_send_mail(struct dsync_brain *brain)
{
const struct dsync_mail *mail;
if (brain->mail_requests &&
brain->box_recv_state < DSYNC_BOX_STATE_MAILS) {
/* wait for mail requests to finish. we could already start
exporting, but then we're going to do quite a lot of
separate searches. especially with pipe backend we'd do
a separate search for each mail. */
return FALSE;
}
while (dsync_mailbox_export_next_mail(brain->box_exporter, &mail) > 0) {
if (dsync_ibc_send_mail(brain->ibc, mail) == 0)
return TRUE;
}
if (dsync_brain_export_deinit(brain) < 0)
return TRUE;
brain->box_send_state = DSYNC_BOX_STATE_DONE;
dsync_brain_send_end_of_list(brain, DSYNC_IBC_EOL_MAILS);
dsync_brain_sync_half_finished(brain);
return TRUE;
}
static bool dsync_brain_recv_last_common(struct dsync_brain *brain)
{
enum dsync_ibc_recv_ret ret;
struct dsync_mailbox_state state;
if ((ret = dsync_ibc_recv_mailbox_state(brain->ibc, &state)) == 0)
return FALSE;
if (ret == DSYNC_IBC_RECV_RET_FINISHED) {
i_error("Remote sent end-of-list instead of a mailbox state");
brain->failed = TRUE;
return TRUE;
}
i_assert(brain->box_send_state == DSYNC_BOX_STATE_DONE);
i_assert(memcmp(state.mailbox_guid, brain->local_dsync_box.mailbox_guid,
sizeof(state.mailbox_guid)) == 0);
/* normally the last_common_* values should be the same in local and
remote, but during unexpected changes they may differ. use the
values that are lower as the final state. */
if (brain->mailbox_state.last_common_uid > state.last_common_uid)
brain->mailbox_state.last_common_uid = state.last_common_uid;
if (brain->mailbox_state.last_common_modseq > state.last_common_modseq)
brain->mailbox_state.last_common_modseq = state.last_common_modseq;
if (brain->mailbox_state.last_common_pvt_modseq > state.last_common_pvt_modseq)
brain->mailbox_state.last_common_pvt_modseq = state.last_common_pvt_modseq;
if (state.changes_during_sync)
brain->changes_during_remote_sync = TRUE;
dsync_brain_sync_mailbox_deinit(brain);
return TRUE;
}
bool dsync_brain_sync_mails(struct dsync_brain *brain)
{
bool changed = FALSE;
i_assert(brain->box != NULL);
switch (brain->box_recv_state) {
case DSYNC_BOX_STATE_MAILBOX:
changed = dsync_brain_master_sync_recv_mailbox(brain);
break;
case DSYNC_BOX_STATE_ATTRIBUTES:
changed = dsync_brain_recv_mailbox_attribute(brain);
break;
case DSYNC_BOX_STATE_CHANGES:
changed = dsync_brain_recv_mail_change(brain);
break;
case DSYNC_BOX_STATE_MAIL_REQUESTS:
changed = dsync_brain_recv_mail_request(brain);
break;
case DSYNC_BOX_STATE_MAILS:
changed = dsync_brain_recv_mail(brain);
break;
case DSYNC_BOX_STATE_RECV_LAST_COMMON:
changed = dsync_brain_recv_last_common(brain);
break;
case DSYNC_BOX_STATE_DONE:
break;
}
if (!dsync_ibc_is_send_queue_full(brain->ibc) && !brain->failed) {
switch (brain->box_send_state) {
case DSYNC_BOX_STATE_MAILBOX:
/* wait for mailbox to be received first */
break;
case DSYNC_BOX_STATE_ATTRIBUTES:
dsync_brain_send_mailbox_attribute(brain);
changed = TRUE;
break;
case DSYNC_BOX_STATE_CHANGES:
dsync_brain_send_mail_change(brain);
changed = TRUE;
break;
case DSYNC_BOX_STATE_MAIL_REQUESTS:
if (dsync_brain_send_mail_request(brain))
changed = TRUE;
break;
case DSYNC_BOX_STATE_MAILS:
if (dsync_brain_send_mail(brain))
changed = TRUE;
break;
case DSYNC_BOX_STATE_RECV_LAST_COMMON:
i_unreached();
case DSYNC_BOX_STATE_DONE:
break;
}
}
return changed;
}