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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
#include "common.h"
#include <sys/select.h>
#include <sys/inotify.h>
#include <sys/ioctl.h>
#include <dirent.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include "job-mgr.h"
#include "seafile-session.h"
#include "utils.h"
#include "wt-monitor.h"
#define DEBUG_FLAG SEAFILE_DEBUG_WATCH
#include "log.h"
typedef struct WatchPathMapping {
GHashTable *wd_to_path; /* watch descriptor -> path */
} WatchPathMapping;
typedef struct RenameInfo {
uint32_t last_cookie;
char *old_path;
gboolean processing; /* Are we processing a rename event? */
} RenameInfo;
typedef struct EventInfo {
int wd;
uint32_t mask;
uint32_t cookie;
char name[NAME_MAX];
} EventInfo;
typedef struct RepoWatchInfo {
WTStatus *status;
WatchPathMapping *mapping;
RenameInfo *rename_info;
EventInfo last_event;
char *worktree;
} RepoWatchInfo;
#define WATCH_MASK IN_MODIFY | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO | IN_CLOSE_WRITE | IN_ATTRIB
struct SeafWTMonitorPriv {
pthread_mutex_t hash_lock;
GHashTable *handle_hash; /* repo_id -> inotify_fd */
GHashTable *info_hash; /* inotify_fd -> RepoWatchInfo */
fd_set read_fds;
int maxfd;
};
static void *wt_monitor_job_linux (void *vmonitor);
static void handle_watch_command (SeafWTMonitor *monitor, WatchCommand *cmd);
static int
add_watch_recursive (RepoWatchInfo *info, int in_fd,
const char *worktree, const char *path,
gboolean add_events);
/* WatchPathMapping */
static WatchPathMapping *create_mapping ()
{
WatchPathMapping *mapping;
mapping = g_new0 (WatchPathMapping, 1);
mapping->wd_to_path = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, g_free);
return mapping;
}
static void free_mapping (WatchPathMapping *mapping)
{
g_hash_table_destroy (mapping->wd_to_path);
g_free (mapping);
}
static void add_mapping (WatchPathMapping *mapping,
const char *path,
int wd)
{
g_hash_table_insert (mapping->wd_to_path, (gpointer)(long)wd, g_strdup(path));
}
/* RenameInfo */
static RenameInfo *create_rename_info ()
{
RenameInfo *info = g_new0 (RenameInfo, 1);
return info;
}
static void free_rename_info (RenameInfo *info)
{
g_free (info->old_path);
g_free (info);
}
inline static void
set_rename_processing_state (RenameInfo *info, uint32_t cookie, const char *path)
{
info->last_cookie = cookie;
info->old_path = g_strdup(path);
info->processing = TRUE;
}
inline static void
unset_rename_processing_state (RenameInfo *info)
{
info->last_cookie = 0;
g_free (info->old_path);
info->old_path = NULL;
info->processing = FALSE;
}
/* RepoWatchInfo */
static RepoWatchInfo *
create_repo_watch_info (const char *repo_id, const char *worktree)
{
WTStatus *status = create_wt_status (repo_id);
WatchPathMapping *mapping = create_mapping ();
RenameInfo *rename_info = create_rename_info ();
RepoWatchInfo *info = g_new0 (RepoWatchInfo, 1);
info->status = status;
info->mapping = mapping;
info->rename_info = rename_info;
info->worktree = g_strdup(worktree);
return info;
}
static void
free_repo_watch_info (RepoWatchInfo *info)
{
wt_status_unref (info->status);
free_mapping (info->mapping);
free_rename_info (info->rename_info);
g_free (info->worktree);
g_free (info);
}
static void
add_event_to_queue (WTStatus *status,
int type, const char *path, const char *new_path)
{
WTEvent *event = wt_event_new (type, path, new_path);
char *name;
switch (type) {
case WT_EVENT_CREATE_OR_UPDATE:
name = "create/update";
break;
case WT_EVENT_SCAN_DIR:
name = "scan dir";
break;
case WT_EVENT_DELETE:
name = "delete";
break;
case WT_EVENT_RENAME:
name = "rename";
break;
case WT_EVENT_OVERFLOW:
name = "overflow";
break;
case WT_EVENT_ATTRIB:
name = "attribute change";
break;
default:
name = "unknown";
}
seaf_debug ("Adding event: %s, %s %s\n", name, path, new_path?new_path:"");
pthread_mutex_lock (&status->q_lock);
g_queue_push_tail (status->event_q, event);
pthread_mutex_unlock (&status->q_lock);
if (type == WT_EVENT_CREATE_OR_UPDATE) {
pthread_mutex_lock (&status->ap_q_lock);
char *last = g_queue_peek_tail (status->active_paths);
if (!last || strcmp(last, path) != 0)
g_queue_push_tail (status->active_paths, g_strdup(path));
pthread_mutex_unlock (&status->ap_q_lock);
}
}
/*
* We only recognize two consecutive "moved" events with the same cookie as
* a rename pair. The processing logic is:
* 1. Receive a MOVED_FROM event, set last_cookie and old_path, set processing to TRUE
* 2. If the next event is MOVED_TO, and with the same cookie, then add an
* WT_EVENT_RENAME event to the queue.
* 3. Otherwise, recognize them as one delete event followed by one
* create event
*
* This is a two-state state machine. The states are 'not processing rename' and
* 'processing rename'.
*/
static void
handle_rename (int in_fd,
RepoWatchInfo *info,
struct inotify_event *event,
const char *worktree,
const char *filename,
gboolean last_event)
{
WTStatus *status = info->status;
RenameInfo *rename_info = info->rename_info;
if (event->mask & IN_MOVED_FROM)
seaf_debug ("(%d) Move %s ->\n", event->cookie, event->name);
else if (event->mask & IN_MOVED_TO)
seaf_debug ("(%d) Move -> %s.\n", event->cookie, event->name);
if (!rename_info->processing) {
if (event->mask & IN_MOVED_FROM) {
if (!last_event) {
set_rename_processing_state (rename_info, event->cookie, filename);
} else {
/* Rename event pair should be in one batch of events.
* If a MOVED_FROM event is the last event in a batch,
* the path should be moved out of the repo.
*/
add_event_to_queue (status, WT_EVENT_DELETE, filename, NULL);
}
} else if (event->mask & IN_MOVED_TO) {
/* A file/dir was moved into this repo. */
/* Add watch and produce events. */
add_event_to_queue (status, WT_EVENT_CREATE_OR_UPDATE, filename, NULL);
add_watch_recursive (info, in_fd, worktree, filename, FALSE);
}
} else {
if (event->mask & IN_MOVED_FROM) {
/* A file/dir was moved out of this repo.
* Output the last MOVED_FROM event as DELETE event
*/
add_event_to_queue (status, WT_EVENT_DELETE, rename_info->old_path, NULL);
if (!last_event) {
/* Stay in processing state. */
rename_info->last_cookie = event->cookie;
g_free (rename_info->old_path);
rename_info->old_path = g_strdup(filename);
} else {
/* Another file/dir was moved out of this repo. */
add_event_to_queue (status, WT_EVENT_DELETE, filename, NULL);
unset_rename_processing_state (rename_info);
}
} else if (event->mask & IN_MOVED_TO) {
if (event->cookie == rename_info->last_cookie) {
/* Rename pair detected. */
add_event_to_queue (status, WT_EVENT_RENAME,
rename_info->old_path, filename);
} else {
/* A file/dir was moved out of the repo, followed by
* aother file/dir was moved into this repo.
*/
add_event_to_queue (status, WT_EVENT_DELETE,
rename_info->old_path, NULL);
add_event_to_queue (status, WT_EVENT_CREATE_OR_UPDATE,
filename, NULL);
}
/* Need to update wd -> path mapping. */
add_watch_recursive (info, in_fd, worktree, filename, FALSE);
unset_rename_processing_state (rename_info);
} else {
/* A file/dir was moved out of this repo, followed by another
* file operations.
*/
add_event_to_queue (status, WT_EVENT_DELETE, rename_info->old_path, NULL);
unset_rename_processing_state (rename_info);
}
}
}
inline static gboolean
is_modify_close_write (EventInfo *e1, struct inotify_event *e2)
{
return ((e1->mask & IN_MODIFY) && (e2->mask & IN_CLOSE_WRITE));
}
#if 0
static gboolean
handle_consecutive_duplicate_event (RepoWatchInfo *info, struct inotify_event *event)
{
gboolean duplicate;
/* Initially last_event is zero so it's not duplicate with any real events. */
duplicate = (info->last_event.wd == event->wd &&
(info->last_event.mask == event->mask ||
is_modify_close_write(&info->last_event, event)) &&
info->last_event.cookie == event->cookie &&
strcmp (info->last_event.name, event->name) == 0);
info->last_event.wd = event->wd;
info->last_event.mask = event->mask;
info->last_event.cookie = event->cookie;
memcpy (info->last_event.name, event->name, event->len);
info->last_event.name[event->len] = 0;
return duplicate;
}
#endif
static void
process_one_event (int in_fd,
RepoWatchInfo *info,
const char *worktree,
const char *parent,
struct inotify_event *event,
gboolean last_event)
{
WTStatus *status = info->status;
char *filename;
gboolean update_last_changed = TRUE;
gboolean add_to_queue = TRUE;
/* An inotfy watch has been removed, we don't care about this for now. */
if ((event->mask & IN_IGNORED) || (event->mask & IN_UNMOUNT))
return;
/* Kernel event queue was overflowed, some events may lost. */
if (event->mask & IN_Q_OVERFLOW) {
add_event_to_queue (status, WT_EVENT_OVERFLOW, NULL, NULL);
return;
}
/* if (handle_consecutive_duplicate_event (info, event)) */
/* add_to_queue = FALSE; */
filename = g_build_filename (parent, event->name, NULL);
handle_rename (in_fd, info, event, worktree, filename, last_event);
if (event->mask & IN_MODIFY) {
seaf_debug ("Modified %s.\n", filename);
if (add_to_queue)
add_event_to_queue (status, WT_EVENT_CREATE_OR_UPDATE, filename, NULL);
} else if (event->mask & IN_CREATE) {
seaf_debug ("Created %s.\n", filename);
/* Nautilus's file copy operation doesn't trigger write events.
* If the user copy a large file into the repo, only a create
* event and a close_write event will be received. If we process
* the create event, we'll certainly try to index a file when it's
* still being copied. So we'll ignore create event for files.
* Since write and close_write events will always be triggered,
* we don't need to worry about missing this file.
*/
char *fullpath = g_build_filename (worktree, filename, NULL);
struct stat st;
if (lstat (fullpath, &st) < 0 ||
(!S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode))) {
g_free (fullpath);
update_last_changed = FALSE;
goto out;
}
g_free (fullpath);
/* We now know it's a directory or a symlink. */
/* Files or dirs could have been added under this dir before we
* watch it. So it's safer to scan this dir. At most time we don't
* have to scan recursively and very few new files will be found.
*/
add_event_to_queue (status, WT_EVENT_CREATE_OR_UPDATE, filename, NULL);
add_watch_recursive (info, in_fd, worktree, filename, FALSE);
} else if (event->mask & IN_DELETE) {
seaf_debug ("Deleted %s.\n", filename);
add_event_to_queue (status, WT_EVENT_DELETE, filename, NULL);
} else if (event->mask & IN_CLOSE_WRITE) {
seaf_debug ("Close write %s.\n", filename);
if (add_to_queue)
add_event_to_queue (status, WT_EVENT_CREATE_OR_UPDATE, filename, NULL);
} else if (event->mask & IN_ATTRIB) {
seaf_debug ("Attribute changed %s.\n", filename);
add_event_to_queue (status, WT_EVENT_ATTRIB, filename, NULL);
}
out:
g_free (filename);
if (update_last_changed)
g_atomic_int_set (&info->status->last_changed, (gint)time(NULL));
}
static gboolean
process_events (SeafWTMonitorPriv *priv, const char *repo_id, int in_fd)
{
char *event_buf = NULL;
unsigned int buf_size;
struct inotify_event *event;
RepoWatchInfo *info;
int rc, n;
char *dir;
gboolean ret = FALSE;
rc = ioctl (in_fd, FIONREAD, &buf_size);
if (rc < 0) {
seaf_warning ("Cannot get inotify event buf size: %s.\n", strerror(errno));
return FALSE;
}
event_buf = g_new (char, buf_size);
n = readn (in_fd, event_buf, buf_size);
if (n < 0) {
seaf_warning ("Failed to read inotify fd: %s.\n", strerror(errno));
goto out;
} else if (n != buf_size) {
seaf_warning ("Read incomplete inotify event struct.\n");
goto out;
}
info = g_hash_table_lookup (priv->info_hash, (gpointer)(long)in_fd);
if (!info) {
seaf_warning ("Repo watch info not found.\n");
goto out;
}
int offset = 0;
while (offset < buf_size) {
event = (struct inotify_event *)&event_buf[offset];
offset += sizeof(struct inotify_event) + event->len;
dir = g_hash_table_lookup (info->mapping->wd_to_path,
(gpointer)(long)event->wd);
if (!dir) {
seaf_warning ("Cannot find path from wd.\n");
goto out;
}
process_one_event (in_fd, info, info->worktree, dir,
event, (offset >= buf_size));
}
ret = TRUE;
out:
g_free (event_buf);
return ret;
}
static void *
wt_monitor_job_linux (void *vmonitor)
{
SeafWTMonitor *monitor = vmonitor;
SeafWTMonitorPriv *priv = monitor->priv;
WatchCommand cmd;
int n;
int rc;
fd_set fds;
int inotify_fd;
char *repo_id;
gpointer key, value;
GHashTableIter iter;
FD_SET (monitor->cmd_pipe[0], &priv->read_fds);
priv->maxfd = monitor->cmd_pipe[0];
while (1) {
fds = priv->read_fds;
rc = select (priv->maxfd + 1, &fds, NULL, NULL, NULL);
if (rc < 0 && errno == EINTR) {
continue;
} else if (rc < 0) {
seaf_warning ("[wt mon] select error: %s.\n", strerror(errno));
break;
}
if (FD_ISSET (monitor->cmd_pipe[0], &fds)) {
n = seaf_pipe_readn (monitor->cmd_pipe[0], &cmd, sizeof(cmd));
if (n != sizeof(cmd)) {
seaf_warning ("[wt mon] failed to read command.\n");
continue;
}
handle_watch_command (monitor, &cmd);
}
g_hash_table_iter_init (&iter, priv->handle_hash);
while (g_hash_table_iter_next (&iter, &key, &value)) {
repo_id = key;
inotify_fd = (int)(long)value;
if (FD_ISSET (inotify_fd, &fds))
process_events (priv, repo_id, inotify_fd);
}
}
return NULL;
}
/* Ignore errors so that we can still monitor other dirs
* when one dir is bad.
*
* If @add_events is TRUE, add events for each dir and entries under that dir.
* Note that only adding events for files is not enough, because repo-mgr will
* need to add empty dirs to index.
*/
static int
add_watch_recursive (RepoWatchInfo *info,
int in_fd,
const char *worktree,
const char *path,
gboolean add_events)
{
char *full_path;
SeafStat st;
DIR *dir;
struct dirent *dent;
int wd;
full_path = g_build_filename (worktree, path, NULL);
if (stat (full_path, &st) < 0) {
seaf_warning ("[wt mon] fail to stat %s: %s\n", full_path, strerror(errno));
goto out;
}
if (add_events && path[0] != 0)
add_event_to_queue (info->status, WT_EVENT_CREATE_OR_UPDATE,
path, NULL);
if (S_ISDIR (st.st_mode)) {
seaf_debug ("Watching %s.\n", full_path);
wd = inotify_add_watch (in_fd, full_path, (uint32_t)WATCH_MASK);
if (wd < 0) {
seaf_warning ("[wt mon] fail to add watch to %s: %s.\n",
full_path, strerror(errno));
goto out;
}
add_mapping (info->mapping, path, wd);
dir = opendir (full_path);
if (!dir) {
seaf_warning ("[wt mon] fail to open dir %s: %s.\n",
full_path, strerror(errno));
goto out;
}
while (1) {
dent = readdir (dir);
if (!dent)
break;
if (strcmp (dent->d_name, ".") == 0 ||
strcmp (dent->d_name, "..") == 0)
continue;
char *sub_path = g_build_filename (path, dent->d_name, NULL);
/* Check d_type to avoid stating every files under this dir.
* Note that d_type may not be supported in some file systems,
* in this case DT_UNKNOWN is returned.
*/
if (dent->d_type == DT_DIR || dent->d_type == DT_LNK ||
dent->d_type == DT_UNKNOWN)
add_watch_recursive (info, in_fd, worktree, sub_path, add_events);
if (dent->d_type == DT_REG && add_events)
add_event_to_queue (info->status, WT_EVENT_CREATE_OR_UPDATE,
sub_path, NULL);
g_free (sub_path);
}
closedir (dir);
}
out:
g_free (full_path);
return 0;
}
static int
add_watch (SeafWTMonitorPriv *priv, const char *repo_id, const char *worktree)
{
int inotify_fd;
RepoWatchInfo *info;
inotify_fd = inotify_init ();
if (inotify_fd < 0) {
seaf_warning ("[wt mon] inotify_init failed: %s.\n", strerror(errno));
return -1;
}
pthread_mutex_lock (&priv->hash_lock);
g_hash_table_insert (priv->handle_hash,
g_strdup(repo_id), (gpointer)(long)inotify_fd);
info = create_repo_watch_info (repo_id, worktree);
g_hash_table_insert (priv->info_hash, (gpointer)(long)inotify_fd, info);
pthread_mutex_unlock (&priv->hash_lock);
if (add_watch_recursive (info, inotify_fd, worktree, "", FALSE) < 0) {
close (inotify_fd);
pthread_mutex_lock (&priv->hash_lock);
g_hash_table_remove (priv->handle_hash, repo_id);
g_hash_table_remove (priv->info_hash, (gpointer)(long)inotify_fd);
pthread_mutex_unlock (&priv->hash_lock);
return -1;
}
/* A special event indicates repo-mgr to scan the whole worktree. */
add_event_to_queue (info->status, WT_EVENT_SCAN_DIR, "", NULL);
return inotify_fd;
}
static int handle_add_repo (SeafWTMonitorPriv *priv,
const char *repo_id,
const char *worktree)
{
int inotify_fd;
inotify_fd = add_watch (priv, repo_id, worktree);
if (inotify_fd < 0) {
return -1;
}
FD_SET (inotify_fd, &priv->read_fds);
priv->maxfd = MAX (inotify_fd, priv->maxfd);
return 0;
}
static void
update_maxfd (SeafWTMonitor *monitor)
{
SeafWTMonitorPriv *priv = monitor->priv;
GHashTableIter iter;
gpointer key, value;
int fd, maxfd = monitor->cmd_pipe[0];
g_hash_table_iter_init (&iter, priv->info_hash);
while (g_hash_table_iter_next (&iter, &key, &value)) {
fd = (int) (long)key;
if (fd > maxfd)
maxfd = fd;
}
priv->maxfd = maxfd;
}
static int handle_rm_repo (SeafWTMonitor *monitor,
const char *repo_id,
gpointer handle)
{
SeafWTMonitorPriv *priv = monitor->priv;
int inotify_fd = (int)(long)handle;
close (inotify_fd);
FD_CLR (inotify_fd, &priv->read_fds);
update_maxfd (monitor);
pthread_mutex_lock (&priv->hash_lock);
g_hash_table_remove (priv->handle_hash, repo_id);
g_hash_table_remove (priv->info_hash, (gpointer)(long)inotify_fd);
pthread_mutex_unlock (&priv->hash_lock);
return 0;
}
static int handle_refresh_repo (SeafWTMonitorPriv *priv, const char *repo_id)
{
return 0;
}
static void
reply_watch_command (SeafWTMonitor *monitor, int result)
{
int n;
n = seaf_pipe_writen (monitor->res_pipe[1], &result, sizeof(int));
if (n != sizeof(int))
seaf_warning ("[wt mon] fail to write command result.\n");
}
static void
handle_watch_command (SeafWTMonitor *monitor, WatchCommand *cmd)
{
SeafWTMonitorPriv *priv = monitor->priv;
if (cmd->type == CMD_ADD_WATCH) {
if (g_hash_table_lookup_extended (priv->handle_hash, cmd->repo_id,
NULL, NULL)) {
reply_watch_command (monitor, 0);
return;
}
if (handle_add_repo(priv, cmd->repo_id, cmd->worktree) < 0) {
seaf_warning ("[wt mon] failed to watch worktree of repo %s.\n",
cmd->repo_id);
reply_watch_command (monitor, -1);
return;
}
seaf_debug ("[wt mon] add watch for repo %s\n", cmd->repo_id);
reply_watch_command (monitor, 0);
} else if (cmd->type == CMD_DELETE_WATCH) {
gpointer key, value;
if (!g_hash_table_lookup_extended (priv->handle_hash, cmd->repo_id,
&key, &value)) {
reply_watch_command (monitor, 0);
return;
}
handle_rm_repo (monitor, cmd->repo_id, value);
reply_watch_command (monitor, 0);
} else if (cmd->type == CMD_REFRESH_WATCH) {
if (handle_refresh_repo (priv, cmd->repo_id) < 0) {
seaf_warning ("[wt mon] failed to refresh watch of repo %s.\n",
cmd->repo_id);
reply_watch_command (monitor, -1);
return;
}
reply_watch_command (monitor, 0);
}
}
/* Public interface functions. */
SeafWTMonitor *
seaf_wt_monitor_new (SeafileSession *seaf)
{
SeafWTMonitor *monitor = g_new0 (SeafWTMonitor, 1);
SeafWTMonitorPriv *priv = g_new0 (SeafWTMonitorPriv, 1);
pthread_mutex_init (&priv->hash_lock, NULL);
priv->handle_hash = g_hash_table_new_full
(g_str_hash, g_str_equal, g_free, NULL);
priv->info_hash = g_hash_table_new_full
(g_direct_hash, g_direct_equal, NULL, (GDestroyNotify)free_repo_watch_info);
monitor->priv = priv;
monitor->seaf = seaf;
monitor->job_func = wt_monitor_job_linux;
return monitor;
}
WTStatus *
seaf_wt_monitor_get_worktree_status (SeafWTMonitor *monitor,
const char *repo_id)
{
SeafWTMonitorPriv *priv = monitor->priv;
gpointer key, value;
RepoWatchInfo *info;
pthread_mutex_lock (&priv->hash_lock);
if (!g_hash_table_lookup_extended (priv->handle_hash, repo_id,
&key, &value)) {
pthread_mutex_unlock (&priv->hash_lock);
return NULL;
}
info = g_hash_table_lookup(priv->info_hash, value);
wt_status_ref (info->status);
pthread_mutex_unlock (&priv->hash_lock);
return info->status;
}
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