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made inotify (currently pseudo) optimal

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This commit is contained in:
Axel Kittenberger 2010-11-26 16:17:36 +00:00
parent 82f80b5d7d
commit c051e15750
6 changed files with 187 additions and 241 deletions
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6
Makefile.am
View File

@ -1,7 +1,11 @@
AUTOMAKE_OPTIONS = foreign
CFLAGS = -Wall $(LIBLUA_CFLAGS)
bin_PROGRAMS = lsyncd
lsyncd_SOURCES = lsyncd.h lsyncd.c lsyncd.lua inotify.c
lsyncd_SOURCES = lsyncd.h lsyncd.c lsyncd.lua
if INOTIFY
lsyncd_SOURCES += inotify.c
endif
lsyncd_LDADD = $(LIBLUA_LIBS)
exampledir = $(datarootdir)/doc/@PACKAGE@
dist_example_DATA = \

27
configure.ac
View File

@ -1,9 +1,10 @@
# -*- Autoconf -*-
echo XXXXXXXXX
# Process this file with autoconf to produce a configure script.
#AC_PREREQ(2.60)
AC_INIT(lsyncd, 2.0beta3, axkibe@gmail.com)
AC_CONFIG_SRCDIR([lsyncd.c],[lsyncd.lua],[inotify.c])
AC_CONFIG_HEADER([config.h],[lsyncd.h])
AC_CONFIG_SRCDIR([lsyncd.c])
AC_CONFIG_HEADER([config.h])
AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
# Checks for programs.
AC_PROG_CC
@ -14,14 +15,28 @@ PKG_CHECK_MODULES(LIBLUA, lua5.1)
# Checks for header files.
AC_CHECK_HEADERS([sys/inotify.h])
###
# --with-runner option
AC_ARG_WITH([runner],
[ --with-runner=<dir> Specify directory where lsyncds part written in Lua will be placed.
If missing it will be compiled into the binary)])
If missing it will be compiled into the binary])
if test "x${with_runner}" != x; then
AC_DEFINE_UNQUOTED(LSYNCD_DEFAULT_RUNNER_FILE, "${with_runner}/lsyncd.lua", "descr")
AC_SUBST(RUNNER_DIR, "${with_runner}")
AC_DEFINE_UNQUOTED(LSYNCD_DEFAULT_RUNNER_FILE, "${with_runner}/lsyncd.lua", "descr")
AC_SUBST(RUNNER_DIR, "${with_runner}")
fi
AM_CONDITIONAL([RUNNER], [test x${with_runner} != x])
AM_CONDITIONAL([RUNNER], [test x${with_runner} != x])
###
# --without-inotify option
AC_ARG_WITH([inotify],
[ --without-inotify Do not compile Linux inotify event interface (on by default)])
if test "x${with_inotify}" == xno; then
echo "compiling without inotify"
else
echo "compiling with inotify"
AC_DEFINE(LSYNCD_WITH_INOTIFY,,"descr")
fi
AM_CONDITIONAL([INOTIFY], [test x${with_inotify} != xno])
# Checks for typedefs, structures, and compiler characteristics.
# Checks for library functions.

41
inotify.c
View File

@ -71,7 +71,7 @@ static int
l_addwatch(lua_State *L)
{
const char *path = luaL_checkstring(L, 1);
int wd = inotify_add_watch(inotify_fd, path, standard_event_mask);
lua_Integer wd = inotify_add_watch(inotify_fd, path, standard_event_mask);
printlogf(L, "Inotify", "addwatch(%s)->%d", path, wd);
lua_pushinteger(L, wd);
return 1;
@ -86,7 +86,7 @@ l_addwatch(lua_State *L)
static int
l_rmwatch(lua_State *L)
{
int wd = luaL_checkinteger(L, 1);
lua_Integer wd = luaL_checkinteger(L, 1);
inotify_rm_watch(inotify_fd, wd);
printlogf(L, "Inotify", "rmwatch()<-%d", wd);
return 0;
@ -252,13 +252,8 @@ static char * readbuf = NULL;
* to the runner.
*/
static void
inotify_ready(lua_State *L, struct observance *observance)
inotify_ready(lua_State *L, int fd, void *extra)
{
if (observance->fd != inotify_fd) {
logstring("Error",
"internal fail, inotify_ready on non-inotify file descriptor.");
exit(-1); // ERRNO
}
while(true) {
ptrdiff_t len;
int err;
@ -312,24 +307,6 @@ inotify_ready(lua_State *L, struct observance *observance)
}
}
/**
* Called by function pointer when the core doesnt want the
* inotify fd anymore (term, hup or overflow)
*/
static void
inotify_tidy(struct observance *observance)
{
if (observance->fd != inotify_fd) {
logstring("Error",
"internal fail, inotify_ready on non-inotify file descriptor.");
exit(-1); // ERRNO
}
close(inotify_fd);
inotify_fd = -1;
free(readbuf);
readbuf = NULL;
}
/**
* registers inotify functions.
*/
@ -361,6 +338,16 @@ open_inotify(lua_State *L) {
close_exec_fd(inotify_fd);
non_block_fd(inotify_fd);
observe_fd(inotify_fd, inotify_ready, NULL, inotify_tidy, NULL);
observe_fd(inotify_fd, inotify_ready, NULL, NULL);
}
/**
* closes inotify
*/
extern void
close_inotify() {
close(inotify_fd);
free(readbuf);
readbuf = NULL;
}

227
lsyncd.c
View File

@ -44,6 +44,16 @@ extern char _binary_luac_out_start;
extern char _binary_luac_out_end;
#endif
/**
* The default notification system to use.
*/
#ifdef LSYNCD_WITH_INOTIFY
extern char *default_notify = "Inotify";
#else
# error "need at least one notifcation system. please rerun ./configure"
#endif
/**
* configuration parameters
*/
@ -158,7 +168,7 @@ add_logcat(const char *name, int priority)
return true;
}
if (!strcmp("scarce", name)) {
settings.log_level = LOG_WARNING;
settings.log_level = LOG_ERR;
return true;
}
@ -364,29 +374,24 @@ struct pipemsg {
* writeable again
*/
static void
pipe_writey(lua_State *L, struct observance *observance) {
struct pipemsg *pm = (struct pipemsg *) observance->extra;
int len = write(observance->fd, pm->text + pm->pos, pm->tlen - pm->pos);
pipe_writey(lua_State *L, int fd, void *extra) {
struct pipemsg *pm = (struct pipemsg *) extra;
int len = write(fd, pm->text + pm->pos, pm->tlen - pm->pos);
bool do_close = false;
pm->pos += len;
if (len < 0) {
logstring("Normal", "broken pipe.");
nonobserve_fd(observance->fd);
do_close = true;
} else if (pm->pos >= pm->tlen) {
logstring("Debug", "finished pipe.");
nonobserve_fd(observance->fd);
do_close = true;
}
if (do_close) {
close(fd);
free(pm->text);
free(extra);
unobserve_fd(fd);
}
}
/**
* TODO
*/
static void
pipe_tidy(struct observance *observance)
{
struct pipemsg *pm = (struct pipemsg *) observance->extra;
close(observance->fd);
free(pm->text);
free(pm);
}
@ -696,6 +701,7 @@ l_exec(lua_State *L)
len = write(pipefd[1], pipe_text, tlen);
if (len < 0) {
logstring("Normal", "immediatly broken pipe.");
close(pipefd[0]);
}
if (len == tlen) {
/* usual and best case, the pipe accepted all input -> close */
@ -703,13 +709,14 @@ l_exec(lua_State *L)
logstring("Exec", "one-sweeped pipe");
} else {
struct pipemsg *pm;
logstring("Exec", "adding pipe observance");
logstring("Exec", "adding pipe observer");
pm = s_calloc(1, sizeof(struct pipemsg));
pm->text = s_strdup(pipe_text);
pm->tlen = tlen;
pm->pos = len;
observe_fd(pipefd[1], NULL, pipe_writey, pipe_tidy, pm);
observe_fd(pipefd[1], NULL, pipe_writey, pm);
}
close(pipefd[0]);
}
free(argv);
lua_pushnumber(L, pid);
@ -890,7 +897,6 @@ l_configure(lua_State *L)
if (!settings.log_file) {
settings.log_syslog = true;
}
// XXX
logstring("Debug", "daemonizing now.");
if (daemon(0, 0)) {
logstring("Error", "Failed to daemonize");
@ -921,6 +927,7 @@ l_configure(lua_State *L)
return 0;
}
static const luaL_reg lsyncdlib[] = {
{"addtoclock", l_addtoclock },
{"clockbefore", l_clockbefore },
@ -945,13 +952,13 @@ static const luaL_reg lsyncdlib[] = {
* Dummy variable whos address is used as the cores index in the lua registry
* to the lua runners function table in the lua registry.
*/
static int runner = 0;
static int runner;
/**
* Dummy variable whos address is used as the cores index n the lua registry
* to the lua runners error handler.
*/
static int callError = 0;
static int callError;
/**
* Pushes a function from the runner on the stack.
@ -976,12 +983,38 @@ load_runner_func(lua_State *L,
}
/**
* An observer to be called when a file descritor becomes
* read-ready or write-ready.
*/
struct observer {
/**
* The file descriptor to observe.
*/
int fd;
/**
* Function to call when read becomes ready.
*/
void (*ready)(lua_State *L, int fd, void *extra);
/**
* Function to call when write becomes ready.
*/
void (*writey)(lua_State *L, int fd, void *extra);
/**
* Extra tokens to pass to the functions-
*/
void *extra;
};
/**
* List of file descriptor watches.
*/
static struct observance * observances = NULL;
static int observances_len = 0;
static int observances_size = 0;
static struct observer * observers = NULL;
static int observers_len = 0;
static int observers_size = 0;
/**
* List of file descriptors to unobserve.
@ -989,14 +1022,14 @@ static int observances_size = 0;
* not be altered, thus unobserve stores here the
* actions that will be delayed.
*/
static int *nonobservances = NULL;
static int nonobservances_len = 0;
static int nonobservances_size = 0;
static int *unobservers = NULL;
static int unobservers_len = 0;
static int unobservers_size = 0;
/**
* true while the observances list is being handled.
* true while the observers list is being handled.
*/
static bool observance_action = false;
static bool observer_action = false;
/**
* Core watches a filedescriptor to become ready,
@ -1004,88 +1037,83 @@ static bool observance_action = false;
*/
extern void
observe_fd(int fd,
void (*ready) (lua_State *L, struct observance *observance),
void (*writey)(lua_State *L, struct observance *observance),
void (*tidy) (struct observance *observance),
void *extra)
void (*ready)(lua_State *L, int fd, void *extra),
void (*writey)(lua_State *L, int fd, void *extra),
void *extra)
{
int pos;
if (observance_action) {
if (observer_action) {
// TODO
logstring("Error",
"Adding observance in ready/writey handlers not yet supported");
"Adding observers in ready/writey handlers not yet supported");
exit(-1); // ERRNO
}
if (observances_len + 1 > observances_size) {
observances_size = observances_len + 1;
observances = s_realloc(observances,
observances_size * sizeof(struct observance));
if (observers_len + 1 > observers_size) {
observers_size = observers_len + 1;
observers = s_realloc(observers,
observers_size * sizeof(struct observer));
}
for(pos = 0; pos < observances_len; pos++) {
if (observances[pos].fd <= fd) {
for(pos = 0; pos < observers_len; pos++) {
if (observers[pos].fd <= fd) {
break;
}
}
if (observances[pos].fd == fd) {
if (observers[pos].fd == fd) {
logstring("Error",
"Observing already an observed file descriptor.");
exit(-1); // ERRNO
}
memmove(observances + pos + 1, observances + pos,
(observances_len - pos) * (sizeof(struct observance)));
memmove(observers + pos + 1, observers + pos,
(observers_len - pos) * (sizeof(struct observer)));
observances_len++;
observances[pos].fd = fd;
observances[pos].ready = ready;
observances[pos].writey = writey;
observances[pos].tidy = tidy;
observances[pos].extra = extra;
observers_len++;
observers[pos].fd = fd;
observers[pos].ready = ready;
observers[pos].writey = writey;
observers[pos].extra = extra;
}
/**
* Makes core no longer watch fd.
*/
extern void
nonobserve_fd(int fd)
unobserve_fd(int fd)
{
int pos;
if (observance_action) {
if (observer_action) {
/* this function is called through a ready/writey handler
* while the core works through the observances list, thus
* while the core works through the observer list, thus
* it does not alter the list, but stores this actions
* on a stack
*/
nonobservances_len++;
if (nonobservances_len > nonobservances_size) {
nonobservances_size = nonobservances_len;
nonobservances = s_realloc(nonobservances,
nonobservances_size * sizeof(int));
unobservers_len++;
if (unobservers_len > unobservers_size) {
unobservers_size = unobservers_len;
unobservers = s_realloc(unobservers,
unobservers_size * sizeof(int));
}
nonobservances[nonobservances_len - 1] = fd;
unobservers[unobservers_len - 1] = fd;
return;
}
/* looks for the fd */
for(pos = 0; pos < observances_len; pos++) {
if (observances[pos].fd == fd) {
for(pos = 0; pos < observers_len; pos++) {
if (observers[pos].fd == fd) {
break;
}
}
if (pos >= observances_len) {
if (pos >= observers_len) {
logstring("Error",
"internal fail, not observed file descriptor in nonobserve_fd()");
"internal fail, not observer file descriptor in unobserve");
exit(-1); //ERRNO
}
if (observances[pos].tidy) {
observances[pos].tidy(observances + pos);
}
/* and moves the list down */
memmove(observances + pos, observances + pos + 1,
(observances_len - pos) * (sizeof(struct observance)));
observances_len--;
memmove(observers + pos, observers + pos + 1,
(observers_len - pos) * (sizeof(struct observer)));
observers_len--;
}
/**
@ -1146,52 +1174,52 @@ masterloop(lua_State *L)
FD_ZERO(&rfds);
FD_ZERO(&wfds);
for(pi = 0; pi < observances_len; pi++) {
int fd = observances[pi].fd;
if (observances[pi].ready) {
for(pi = 0; pi < observers_len; pi++) {
int fd = observers[pi].fd;
if (observers[pi].ready) {
FD_SET(fd, &rfds);
}
if (observances[pi].writey) {
if (observers[pi].writey) {
FD_SET(fd, &wfds);
}
}
/* the great select */
pr = pselect(
observances[observances_len - 1].fd + 1,
observers[observers_len - 1].fd + 1,
&rfds, &wfds, NULL,
have_alarm ? &tv : NULL, &sigset);
if (pr >= 0) {
/* walks through the observances calling ready/writey fds */
observance_action = true;
for(pi = 0; pi < observances_len; pi++) {
struct observance *obs = observances + pi;
int fd = obs->fd;
/* walks through the observers calling ready/writey fds */
observer_action = true;
for(pi = 0; pi < observers_len; pi++) {
int fd = observers[pi].fd;
void *extra = observers[pi].extra;
if (hup || term) {
break;
}
if (obs->ready && FD_ISSET(fd, &rfds)) {
obs->ready(L, obs);
if (observers[pi].ready && FD_ISSET(fd, &rfds)) {
observers[pi].ready(L, fd, extra);
}
if (hup || term) {
break;
}
if (nonobservances_len > 0 &&
nonobservances[nonobservances_len - 1] == fd) {
/* ready() nonobserved itself */
if (unobservers_len > 0 &&
unobservers[unobservers_len - 1] == fd) {
/* ready() unobserved itself */
continue;
}
if (obs->writey && FD_ISSET(fd, &wfds)) {
obs->writey(L, obs);
if (observers[pi].writey && FD_ISSET(fd, &wfds)) {
observers[pi].writey(L, fd, extra);
}
}
observance_action = false;
observer_action = false;
/* work through delayed unobserve_fd() calls */
for (pi = 0; pi < nonobservances_len; pi++) {
nonobserve_fd(nonobservances[pi]);
for (pi = 0; pi < unobservers_len; pi++) {
unobserve_fd(unobservers[pi]);
}
nonobservances_len = 0;
unobservers_len = 0;
}
}
}
@ -1287,7 +1315,6 @@ main1(int argc, char *argv[])
/* prepares logging early */
int i = 1;
add_logcat("Normal", LOG_NOTICE);
add_logcat("Warn", LOG_WARNING);
add_logcat("Error", LOG_ERR);
while (i < argc) {
if (strcmp(argv[i], "-log") && strcmp(argv[i], "--log")) {
@ -1511,19 +1538,6 @@ main1(int argc, char *argv[])
masterloop(L);
/* cleanup */
{
/* close/frees observances */
int i;
for(i = 0; i < observances_len; i++) {
struct observance *obs = observances + i;
if (obs->tidy) {
obs->tidy(obs);
}
}
observances_len = 0;
nonobservances_len = 0;
observance_action = false;
}
{
/* frees logging categories */
int ci;
@ -1552,6 +1566,7 @@ main1(int argc, char *argv[])
settings.log_level = 0,
settings.nodaemon = false,
close_inotify();
lua_close(L);
return 0;
}

38
lsyncd.h
View File

@ -103,43 +103,23 @@ extern void non_block_fd(int fd);
/* Sets the close-on-exit flag for a file descriptor. */
extern void close_exec_fd(int fd);
/**
* An observance calls functions when a file descritor becomes
* read-ready or write-ready.
*/
struct observance {
/* The file descriptor observed. */
int fd;
/* Function to call when read becomes ready. */
void (*ready)(lua_State *L, struct observance *observance);
/* Function to call when write becomes ready. */
void (*writey)(lua_State *L, struct observance *observance);
/* Function that tidies up, closes fd, frees extra data. etc. */
void (*tidy)(struct observance *observance);
/* Extra tokens to pass to the functions */
void *extra;
};
/* makes the core to observe a file descriptor */
extern void
observe_fd(int fd,
void (*ready) (lua_State *L, struct observance *observance),
void (*writey)(lua_State *L, struct observance *observance),
void (*tidy) (struct observance *observance),
void *extra);
extern void observe_fd(
int fd,
void (*ready)(lua_State *L, int fd, void *extra),
void (*writey)(lua_State *L, int fd, void *extra),
void *extra);
/* stops the core to observe a file descriptor */
extern void nonobserve_fd(int fd);
extern void unobserve_fd(int fd);
/*-----------------------------------------------------------------------------
* inotify
*/
extern void register_inotify(lua_State *L);
extern void open_inotify(lua_State *L);
extern void close_inotify();
#endif

85
lsyncd.lua
View File

@ -1402,6 +1402,9 @@ local Syncs = (function()
end
-- loads a default value for an option if not existent
if not settings then
settings = {}
end
local defaultValues = {
'action',
'collapse',
@ -1464,7 +1467,7 @@ end
-- So lsyncd can work with other notifications mechanisms just
-- by changing this.
--
local Inotifies = (function()
local Inotify = (function()
-----
-- A list indexed by inotifies watch descriptor yielding the
@ -1514,7 +1517,7 @@ local Inotifies = (function()
--
local function addWatch(path, recurse, raiseSync, raiseTime)
log("Function",
"Inotifies.addWatch(",path,", ",recurse,", ",
"Inotify.addWatch(",path,", ",recurse,", ",
raiseSync,", ",raiseTime,")")
-- lets the core registers watch with the kernel
@ -1574,7 +1577,7 @@ local Inotifies = (function()
--
local function addSync(sync, root)
if syncRoots[sync] then
error("internal fail, duplicate sync in Inotifies()")
error("internal fail, duplicate sync in Inotify.addSync()")
end
syncRoots[sync] = root
addWatch(root, true)
@ -1957,7 +1960,7 @@ local StatusFile = (function()
f:write("\n")
end
Inotifies.statusReport(f)
Inotify.statusReport(f)
f:close()
end
@ -2072,7 +2075,6 @@ USAGE:
lsyncd [OPTIONS] -rsyncssh [SOURCE] [HOST] [TARGETDIR]
OPTIONS:
-dryrun Subprocesses are not actually invoked.
-help Shows this
-log all Logs everything (debug)
-log scarce Logs errors only
@ -2109,10 +2111,6 @@ function runner.configure(args)
-- a list of all valid --options
local options = {
-- log is handled by core already.
dryrun =
{0, function()
clSettings.dryrun=true
end},
log =
{1, nil},
logfile =
@ -2283,7 +2281,7 @@ function runner.initialize()
-- runs through the Syncs created by users
for _, s in Syncs.iwalk() do
Inotifies.addSync(s, s.source)
Inotify.addSync(s, s.source)
if s.config.init then
InletControl.setSync(s)
s.config.init(Inlet)
@ -2409,42 +2407,13 @@ function spawn(agent, binary, ...)
if lsyncdStatus == "fade" then
log("Normal", "ignored spawn processs since status fading")
end
if not settings.dryrun then
local pid = lsyncd.exec(binary, ...)
if pid and pid > 0 then
local sync = InletControl.getSync()
local delay = InletControl.getDelay(agent)
if delay then
delay.status = "active"
sync.processes[pid] = delay
else
local dlist = InletControl.getDelayList(agent)
if not dlist then
error("spawning with an unknown agent", 2)
end
for k, d in pairs(dlist) do
if type(k) == "number" then
d.status = "active"
end
end
sync.processes[pid] = dlist
end
end
else
local a1, a2 = ...
if a1 ~= "<" then
log("Normal", "would call ", binary, " ", table.concat({...}, " "))
else
local aa = {...}
table.remove(aa, 1)
table.remove(aa, 1)
log("Normal", "would call ", binary, " ", table.concat(aa, " "),
"\ninput pipe <\n", a2)
end
local pid = lsyncd.exec(binary, ...)
if pid and pid > 0 then
local sync = InletControl.getSync()
local delay = InletControl.getDelay(agent)
if delay then
sync:removeDelay(delay)
delay.status = "active"
sync.processes[pid] = delay
else
local dlist = InletControl.getDelayList(agent)
if not dlist then
@ -2452,9 +2421,10 @@ function spawn(agent, binary, ...)
end
for k, d in pairs(dlist) do
if type(k) == "number" then
sync:removeDelay(d)
d.status = "active"
end
end
sync.processes[pid] = dlist
end
end
end
@ -2466,6 +2436,7 @@ function spawnShell(agent, command, ...)
return spawn(agent, "/bin/sh", "-c", command, "/bin/sh", ...)
end
-----
-- Comfort routine also for user.
-- Returns true if 'String' starts with 'Start'
@ -2483,27 +2454,6 @@ function string.ends(String,End)
end
------
-- Replaces default os.execute with a warning message,
-- doing the execute nevertheless, if not in dryrun.
--
local os_execute = os.execute
os.execute = function(...)
log("Warn", "using os.execute makes Lsyncd splutter, use spawn() instead.")
if not settings.dryrun then
os_execute(...)
else
log("Normal", "would os.execute ", table.concat({...}, " "))
end
end
-----
-- An empty settings table optionally for the config to
-- expand instead of replace.
--
settings = {}
--============================================================================
-- Lsyncd default settings
--============================================================================
@ -2927,11 +2877,6 @@ default = {
return rc
end,
-----
-- default Delay
--
delay = 5,
-----
-- called on (re)initalizing of Lsyncd.
--