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4c189ba6b0
glib/gio/fen/fen-data.c
Matthias Clasen 8907bfee86 Fix up GIO docs
2009-11-29 22:54:16 -05:00

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set expandtab ts=4 shiftwidth=4: */
/*
* Copyright (C) 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors: Lin Ma <lin.ma@sun.com>
*/
#include "config.h"
#include <port.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <errno.h>
#include <glib.h>
#include "fen-data.h"
#include "fen-kernel.h"
#include "fen-missing.h"
#include "fen-dump.h"
#define PROCESS_EVENTQ_TIME 10 /* in milliseconds */
#define PAIR_EVENTS_TIMEVAL 00000 /* in microseconds */
#define PAIR_EVENTS_INC_TIMEVAL 0000 /* in microseconds */
#define SCAN_CHANGINGS_TIME 50 /* in milliseconds */
#define SCAN_CHANGINGS_MAX_TIME (4*100) /* in milliseconds */
#define SCAN_CHANGINGS_MIN_TIME (4*100) /* in milliseconds */
#define INIT_CHANGES_NUM 2
#define BASE_NUM 2
#ifdef GIO_COMPILATION
#define FD_W if (fd_debug_enabled) g_warning
static gboolean fd_debug_enabled = FALSE;
#else
#include "gam_error.h"
#define FD_W(...) GAM_DEBUG(DEBUG_INFO, __VA_ARGS__)
#endif
G_LOCK_EXTERN (fen_lock);
static GList *deleting_data = NULL;
static guint deleting_data_id = 0;
static void (*emit_once_cb) (fdata *f, int events, gpointer sub);
static void (*emit_cb) (fdata *f, int events);
static int (*_event_converter) (int event);
static gboolean fdata_delete (fdata* f);
static gint fdata_sub_find (gpointer a, gpointer b);
static void scan_children (node_t *f);
static void scan_known_children (node_t* f);
node_t*
_add_missing_cb (node_t* parent, gpointer user_data)
{
g_assert (parent);
FD_W ("%s p:0x%p %s\n", __func__, parent, (gchar*)user_data);
return _add_node (parent, (gchar*)user_data);
}
gboolean
_pre_del_cb (node_t* node, gpointer user_data)
{
fdata* data;
g_assert (node);
data = _node_get_data (node);
FD_W ("%s node:0x%p %s\n", __func__, node, NODE_NAME(node));
if (data != NULL) {
if (!FN_IS_PASSIVE(data)) {
return FALSE;
}
fdata_delete (data);
}
return TRUE;
}
static guint
_pow (guint x, guint y)
{
guint z = 1;
g_assert (x >= 0 && y >= 0);
for (; y > 0; y--) {
z *= x;
}
return z;
}
static guint
get_scalable_scan_time (fdata* data)
{
guint sleep_time;
/* Caculate from num = 0 */
sleep_time = _pow (BASE_NUM, data->changed_event_num) * SCAN_CHANGINGS_TIME;
if (sleep_time < SCAN_CHANGINGS_MIN_TIME) {
sleep_time = SCAN_CHANGINGS_MIN_TIME;
} else if (sleep_time > SCAN_CHANGINGS_MAX_TIME) {
sleep_time = SCAN_CHANGINGS_MAX_TIME;
data->change_update_id = INIT_CHANGES_NUM;
}
FD_W ("SCALABE SCAN num:time [ %4u : %4u ] %s\n", data->changed_event_num, sleep_time, FN_NAME(data));
return sleep_time;
}
static gboolean
g_timeval_lt (GTimeVal *val1, GTimeVal *val2)
{
if (val1->tv_sec < val2->tv_sec)
return TRUE;
if (val1->tv_sec > val2->tv_sec)
return FALSE;
/* val1->tv_sec == val2->tv_sec */
if (val1->tv_usec < val2->tv_usec)
return TRUE;
return FALSE;
}
/*
* If all active children nodes are ported, then cancel monitor the parent node
*
* Unsafe, need lock.
*/
static void
scan_known_children (node_t* f)
{
GDir *dir;
GError *err = NULL;
fdata* pdata;
FD_W ("%s %s [0x%p]\n", __func__, NODE_NAME(f), f);
pdata = _node_get_data (f);
/*
* Currect fdata must is directly monitored. Be sure it is 1 level monitor.
*/
dir = g_dir_open (NODE_NAME(f), 0, &err);
if (dir) {
const char *basename;
while ((basename = g_dir_read_name (dir)))
{
node_t* childf = NULL;
fdata* data;
GList *idx;
/*
* If the node is existed, and isn't ported, then emit created
* event. Ignore others.
*/
childf = _children_find (f, basename);
if (childf &&
(data = _node_get_data (childf)) != NULL &&
!FN_IS_PASSIVE (data)) {
if (!is_monitoring (data) &&
_port_add (&data->fobj, &data->len, data)) {
_fdata_emit_events (data, FN_EVENT_CREATED);
}
}
}
g_dir_close (dir);
} else {
FD_W (err->message);
g_error_free (err);
}
}
static void
scan_children (node_t *f)
{
GDir *dir;
GError *err = NULL;
fdata* pdata;
FD_W ("%s %s [0x%p]\n", __func__, NODE_NAME(f), f);
pdata = _node_get_data (f);
/*
* Currect fdata must is directly monitored. Be sure it is 1 level monitor.
*/
dir = g_dir_open (NODE_NAME(f), 0, &err);
if (dir) {
const char *basename;
while ((basename = g_dir_read_name (dir)))
{
node_t* childf = NULL;
fdata* data;
GList *idx;
childf = _children_find (f, basename);
if (childf == NULL) {
gchar *filename;
filename = g_build_filename (NODE_NAME(f), basename, NULL);
childf = _add_node (f, filename);
g_assert (childf);
data = _fdata_new (childf, FALSE);
g_free (filename);
}
if ((data = _node_get_data (childf)) == NULL) {
data = _fdata_new (childf, FALSE);
}
/* Be sure data isn't ported and add to port successfully */
/* Don't need delete it, it will be deleted by the parent */
if (is_monitoring (data)) {
/* Ignored */
} else if (/* !_is_ported (data) && */
_port_add (&data->fobj, &data->len, data)) {
_fdata_emit_events (data, FN_EVENT_CREATED);
}
}
g_dir_close (dir);
} else {
FD_W (err->message);
g_error_free (err);
}
}
static gboolean
scan_deleting_data (gpointer data)
{
fdata *f;
GList* i;
GList* deleted_list = NULL;
gboolean ret = TRUE;
if (G_TRYLOCK (fen_lock)) {
for (i = deleting_data; i; i = i->next) {
f = (fdata*)i->data;
if (fdata_delete (f)) {
deleted_list = g_list_prepend (deleted_list, i);
}
}
for (i = deleted_list; i; i = i->next) {
deleting_data = g_list_remove_link (deleting_data,
(GList *)i->data);
g_list_free_1 ((GList *)i->data);
}
g_list_free (deleted_list);
if (deleting_data == NULL) {
deleting_data_id = 0;
ret = FALSE;
}
G_UNLOCK (fen_lock);
}
return ret;
}
gboolean
is_monitoring (fdata* data)
{
return _is_ported (data) || data->change_update_id > 0;
}
fdata*
_get_parent_data (fdata* data)
{
if (FN_NODE(data) && !IS_TOPNODE(FN_NODE(data))) {
return _node_get_data (FN_NODE(data)->parent);
}
return NULL;
}
node_t*
_get_parent_node (fdata* data)
{
if (FN_NODE(data)) {
return (FN_NODE(data)->parent);
}
return NULL;
}
fdata *
_fdata_new (node_t* node, gboolean is_mondir)
{
fdata *f = NULL;
g_assert (node);
if ((f = g_new0 (fdata, 1)) != NULL) {
FN_NODE(f) = node;
FN_NAME(f) = g_strdup (NODE_NAME(node));
f->is_dir = is_mondir;
f->eventq = g_queue_new ();
FD_W ("[ %s ] 0x%p %s\n", __func__, f, FN_NAME(f));
_node_set_data (node, f);
}
return f;
}
static gboolean
fdata_delete (fdata *f)
{
fnode_event_t *ev;
FD_W ("[ TRY %s ] 0x%p id[%4d:%4d] %s\n", __func__, f, f->eventq_id, f->change_update_id, FN_NAME(f));
g_assert (FN_IS_PASSIVE(f));
_port_remove (f);
/* _missing_remove (f); */
if (f->node != NULL) {
_node_set_data (f->node, NULL);
f->node = NULL;
}
if (f->change_update_id > 0 || f->eventq_id > 0) {
if (FN_IS_LIVING(f)) {
f->is_cancelled = TRUE;
deleting_data = g_list_prepend (deleting_data, f);
if (deleting_data_id == 0) {
deleting_data_id = g_idle_add (scan_deleting_data, NULL);
g_assert (deleting_data_id > 0);
}
}
return FALSE;
}
FD_W ("[ %s ] 0x%p %s\n", __func__, f, FN_NAME(f));
while ((ev = g_queue_pop_head (f->eventq)) != NULL) {
_fnode_event_delete (ev);
}
g_queue_free (f->eventq);
g_free (FN_NAME(f));
g_free (f);
return TRUE;
}
void
_fdata_reset (fdata* data)
{
fnode_event_t *ev;
g_assert (data);
while ((ev = g_queue_pop_head (data->eventq)) != NULL) {
_fnode_event_delete (ev);
}
}
static gint
fdata_sub_find (gpointer a, gpointer b)
{
if (a != b) {
return 1;
} else {
return 0;
}
}
void
_fdata_sub_add (fdata *f, gpointer sub)
{
FD_W ("[%s] [data: 0x%p ] [s: 0x%p ] %s\n", __func__, f, sub, FN_NAME(f));
g_assert (g_list_find_custom (f->subs, sub, (GCompareFunc)fdata_sub_find) == NULL);
f->subs = g_list_prepend (f->subs, sub);
}
void
_fdata_sub_remove (fdata *f, gpointer sub)
{
GList *l;
FD_W ("[%s] [data: 0x%p ] [s: 0x%p ] %s\n", __func__, f, sub, FN_NAME(f));
g_assert (g_list_find_custom (f->subs, sub, (GCompareFunc)fdata_sub_find) != NULL);
l = g_list_find_custom (f->subs, sub, (GCompareFunc)fdata_sub_find);
g_assert (l);
g_assert (sub == l->data);
f->subs = g_list_delete_link (f->subs, l);
}
/*
* Adjust self on failing to Port
*/
void
_fdata_adjust_deleted (fdata* f)
{
node_t* parent;
fdata* pdata;
node_op_t op = {NULL, NULL, _pre_del_cb, NULL};
/*
* It's a top node. We move it to missing list.
*/
parent = _get_parent_node (f);
pdata = _get_parent_data (f);
if (!FN_IS_PASSIVE(f) ||
_children_num (FN_NODE(f)) > 0 ||
(pdata && !FN_IS_PASSIVE(pdata))) {
if (parent) {
if (pdata == NULL) {
pdata = _fdata_new (parent, FALSE);
}
g_assert (pdata);
if (!_port_add (&pdata->fobj, &pdata->len, pdata)) {
_fdata_adjust_deleted (pdata);
}
} else {
/* f is root */
g_assert (IS_TOPNODE(FN_NODE(f)));
_missing_add (f);
}
} else {
#ifdef GIO_COMPILATION
_pending_remove_node (FN_NODE(f), &op);
#else
_remove_node (FN_NODE(f), &op);
#endif
}
}
static gboolean
fdata_adjust_changed (fdata *f)
{
fnode_event_t *ev;
struct stat buf;
node_t* parent;
fdata* pdata;
G_LOCK (fen_lock);
parent = _get_parent_node (f);
pdata = _get_parent_data (f);
if (!FN_IS_LIVING(f) ||
(_children_num (FN_NODE(f)) == 0 &&
FN_IS_PASSIVE(f) &&
pdata && FN_IS_PASSIVE(pdata))) {
f->change_update_id = 0;
G_UNLOCK (fen_lock);
return FALSE;
}
FD_W ("[ %s ] %s\n", __func__, FN_NAME(f));
if (FN_STAT (FN_NAME(f), &buf) != 0) {
FD_W ("LSTAT [%-20s] %s\n", FN_NAME(f), g_strerror (errno));
goto L_delete;
}
f->is_dir = S_ISDIR (buf.st_mode) ? TRUE : FALSE;
if (f->len != buf.st_size) {
/* FD_W ("LEN [%lld:%lld] %s\n", f->len, buf.st_size, FN_NAME(f)); */
f->len = buf.st_size;
ev = _fnode_event_new (FILE_MODIFIED, TRUE, f);
if (ev != NULL) {
ev->is_pending = TRUE;
_fdata_add_event (f, ev);
}
/* Fdata is still changing, so scalable scan */
f->change_update_id = g_timeout_add (get_scalable_scan_time (f),
(GSourceFunc)fdata_adjust_changed,
(gpointer)f);
G_UNLOCK (fen_lock);
return FALSE;
} else {
f->changed_event_num = 0;
f->fobj.fo_atime = buf.st_atim;
f->fobj.fo_mtime = buf.st_mtim;
f->fobj.fo_ctime = buf.st_ctim;
if (FN_IS_DIR(f)) {
if (FN_IS_MONDIR(f)) {
scan_children (FN_NODE(f));
} else {
scan_known_children (FN_NODE(f));
if ((_children_num (FN_NODE(f)) == 0 &&
FN_IS_PASSIVE(f) &&
pdata && FN_IS_PASSIVE(pdata))) {
_port_remove (f);
goto L_exit;
}
}
}
if (!_port_add_simple (&f->fobj, f)) {
L_delete:
ev = _fnode_event_new (FILE_DELETE, FALSE, f);
if (ev != NULL) {
_fdata_add_event (f, ev);
}
}
}
L_exit:
f->change_update_id = 0;
G_UNLOCK (fen_lock);
return FALSE;
}
void
_fdata_emit_events_once (fdata *f, int event, gpointer sub)
{
emit_once_cb (f, _event_converter (event), sub);
}
void
_fdata_emit_events (fdata *f, int event)
{
emit_cb (f, _event_converter (event));
}
static gboolean
process_events (gpointer udata)
{
node_op_t op = {NULL, NULL, _pre_del_cb, NULL};
fdata* f;
fnode_event_t* ev;
int e;
/* FD_W ("IN <======== %s\n", __func__); */
f = (fdata*)udata;
FD_W ("%s 0x%p id:%-4d %s\n", __func__, f, f->eventq_id, FN_NAME(f));
G_LOCK (fen_lock);
if (!FN_IS_LIVING(f)) {
f->eventq_id = 0;
G_UNLOCK (fen_lock);
return FALSE;
}
if ((ev = (fnode_event_t*)g_queue_pop_head (f->eventq)) != NULL) {
/* Send events to clients. */
e = ev->e;
if (!ev->is_pending) {
#ifdef GIO_COMPILATION
if (ev->has_twin) {
_fdata_emit_events (f, FILE_ATTRIB);
}
#endif
_fdata_emit_events (f, ev->e);
}
_fnode_event_delete (ev);
ev = NULL;
/* Adjust node state. */
/*
* Node the node has been created, so we can delete create event in
* optimizing. To reduce the statings, we add it to Port on discoving
* it then emit CREATED event. So we don't need to do anything here.
*/
switch (e) {
case FILE_MODIFIED:
case MOUNTEDOVER:
case UNMOUNTED:
/* If the event is a changed event, then pending process it */
if (f->change_update_id == 0) {
f->change_update_id = g_timeout_add (get_scalable_scan_time(f),
(GSourceFunc)fdata_adjust_changed,
(gpointer)f);
g_assert (f->change_update_id > 0);
}
break;
case FILE_ATTRIB:
g_assert (f->change_update_id == 0);
if (!_port_add (&f->fobj, &f->len, f)) {
ev = _fnode_event_new (FILE_DELETE, FALSE, f);
if (ev != NULL) {
_fdata_add_event (f, ev);
}
}
break;
case FILE_DELETE: /* Ignored */
break;
default:
g_assert_not_reached ();
break;
}
/* Process one event a time */
G_UNLOCK (fen_lock);
return TRUE;
}
f->eventq_id = 0;
G_UNLOCK (fen_lock);
/* FD_W ("OUT ========> %s\n", __func__); */
return FALSE;
}
void
_fdata_add_event (fdata *f, fnode_event_t *ev)
{
node_op_t op = {NULL, NULL, _pre_del_cb, NULL};
fnode_event_t *tail;
if (!FN_IS_LIVING(f)) {
_fnode_event_delete (ev);
return;
}
FD_W ("%s %d\n", __func__, ev->e);
g_get_current_time (&ev->t);
/*
* If created/deleted events of child node happened, then we use parent
* event queue to handle.
* If child node emits deleted event, it seems no changes for the parent
* node, but the attr is changed. So we may try to cancel processing the
* coming changed events of the parent node.
*/
tail = (fnode_event_t*)g_queue_peek_tail (f->eventq);
switch (ev->e) {
case FILE_RENAME_FROM:
case FILE_RENAME_TO:
case FILE_ACCESS:
_fnode_event_delete (ev);
g_assert_not_reached ();
return;
case FILE_DELETE:
/* clear changed event number */
f->changed_event_num = 0;
/*
* We will cancel all previous events.
*/
if (tail) {
g_queue_pop_tail (f->eventq);
do {
_fnode_event_delete (tail);
} while ((tail = (fnode_event_t*)g_queue_pop_tail (f->eventq)) != NULL);
}
/*
* Given a node "f" is deleted, process it ASAP.
*/
_fdata_emit_events (f, ev->e);
_fnode_event_delete (ev);
_fdata_adjust_deleted (f);
return;
case FILE_MODIFIED:
case UNMOUNTED:
case MOUNTEDOVER:
/* clear changed event number */
f->changed_event_num ++;
case FILE_ATTRIB:
default:
/*
* If in the time range, we will try optimizing
* (changed+) to (changed)
* (attrchanged changed) to ([changed, attrchanged])
* (event attrchanged) to ([event, attrchanged])
*/
if (tail) {
do {
if (tail->e == ev->e) {
if (g_timeval_lt (&ev->t, &tail->t)) {
g_queue_peek_tail (f->eventq);
/* Add the increment */
g_time_val_add (&ev->t, PAIR_EVENTS_INC_TIMEVAL);
/* skip the previous event */
FD_W ("SKIPPED -- %s\n", _event_string (tail->e));
_fnode_event_delete (tail);
} else {
break;
}
} else if (ev->e == FILE_MODIFIED && tail->e == FILE_ATTRIB) {
ev->has_twin = TRUE;
_fnode_event_delete (tail);
} else if (ev->e == FILE_ATTRIB && f->change_update_id > 0) {
tail->has_twin = TRUE;
/* skip the current event */
_fnode_event_delete (ev);
return;
} else {
break;
}
} while ((tail = (fnode_event_t*)g_queue_peek_tail (f->eventq)) != NULL);
}
}
/* must add the threshold time */
g_time_val_add (&ev->t, PAIR_EVENTS_TIMEVAL);
g_queue_push_tail (f->eventq, ev);
/* starting process_events */
if (f->eventq_id == 0) {
f->eventq_id = g_timeout_add (PROCESS_EVENTQ_TIME,
process_events,
(gpointer)f);
g_assert (f->eventq_id > 0);
}
FD_W ("%s 0x%p id:%-4d %s\n", __func__, f, f->eventq_id, FN_NAME(f));
}
gboolean
_fdata_class_init (void (*user_emit_cb) (fdata*, int),
void (*user_emit_once_cb) (fdata*, int, gpointer),
int (*user_event_converter) (int event))
{
FD_W ("%s\n", __func__);
if (user_emit_cb == NULL) {
return FALSE;
}
if (user_emit_once_cb == NULL) {
return FALSE;
}
if (user_event_converter == NULL) {
return FALSE;
}
emit_cb = user_emit_cb;
emit_once_cb = user_emit_once_cb;
_event_converter = user_event_converter;
if (!_port_class_init (_fdata_add_event)) {
FD_W ("_port_class_init failed.");
return FALSE;
}
return TRUE;
}
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