wyebadblock/wyebrun.c

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/*
Copyright 2018 jun7@hush.mail
This file is part of wyebrun.
wyebrun is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
wyebrun 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with wyebrun. If not, see <http://www.gnu.org/licenses/>.
*/
//getpid
#include <sys/types.h>
#include <unistd.h>
//flock
#include <sys/file.h>
//monitor
#include <gio/gio.h>
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#include "wyebrun.h"
#define ROOTNAME "wyebrun"
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#define CLIDIR "clients"
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#define PREFIX WYEBPREFIX
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#define KEEPS WYEBKEEPSEC
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#define INPUT "wyebinput"
#define PING "wyebping"
#define DPINGTIME 1000
#define P(f, ...) g_print(#f"\n", __VA_ARGS__);
#if DEBUG
static gint64 start;
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# define D(f, ...) g_print("#"#f"\n", __VA_ARGS__);
# define DD(a) g_print("#"#a"\n");
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#else
# define D(...) ;
# define DD(a) ;
#endif
typedef enum {
//to svr
CSuntil = 'u',
CSdata = 'd',
CSping = 'p',
//to client
CCwoke = 'w',
CCret = 'r', //retrun data
CClost = 'l', //we lost the req
} Com;
//shared
static void fatal(int i)
{
P(\n!!! fatal %d !!!\n, i)
exit(1);
}
static void mkdirif(char *path)
{
char *dir = g_path_get_dirname(path);
if (!g_file_test(dir, G_FILE_TEST_EXISTS))
g_mkdir_with_parents(dir, 0700);
g_free(dir);
}
static char *ipcpath(char *exe, char *name)
{
return g_build_filename(g_get_user_runtime_dir(),
ROOTNAME,exe, name, NULL);
}
static char *preparepp(char *exe, char *name)
{
char *path = ipcpath(exe, name);
if (!g_file_test(path, G_FILE_TEST_EXISTS))
{
mkdirif(path);
mkfifo(path, 0600);
}
return path;
}
static bool ipcsend(char *exe, char *name,
Com type, char *caller, char *data)
{
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static GMutex m;
g_mutex_lock(&m);
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//D(ipcsend exe:%s name:%s, exe, name)
char *path = preparepp(exe, name);
char *esc = g_strescape(data ?: "", "");
char *line = g_strdup_printf("%c%s:%s\n", type, caller ?: "", esc);
g_free(esc);
int pp = open(path, O_WRONLY | O_NONBLOCK);
bool ret = write(pp, line, strlen(line)) != -1;
g_free(line);
close(pp);
g_free(path);
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g_mutex_unlock(&m);
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return ret;
}
static gboolean ipccb(GIOChannel *ch, GIOCondition c, gpointer p);
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static GSource *ipcwatch(char *exe, char *name, GMainContext *ctx, gpointer p)
{
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char *path = preparepp(exe, name);
GIOChannel *io = g_io_channel_new_file(path, "r+", NULL);
GSource *watch = g_io_create_watch(io, G_IO_IN);
g_io_channel_unref(io);
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g_source_set_callback(watch, (GSourceFunc)ipccb, p, NULL);
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g_source_attach(watch, ctx);
g_free(path);
return watch;
}
//@server
static char *svrexe = NULL;
static GMainLoop *sloop = NULL;
static wyebdataf dataf = NULL;
static GHashTable *orders = NULL;
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static GMutex ordersm;
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static gboolean quitif(gpointer p)
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{
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g_mutex_lock(&ordersm);
if (!g_hash_table_size(orders))
{
DD(SVR QUITS\n)
g_main_loop_quit(sloop);
}
g_mutex_unlock(&ordersm);
return true;
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}
static void until(int sec)
{
if (!sloop) return;
static guint last = 0;
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static GMutex m;
g_mutex_lock(&m);
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if (last)
g_source_remove(last);
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last = g_timeout_add_full(G_PRIORITY_LOW * 2, sec * 1000, quitif, NULL, NULL);
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g_mutex_unlock(&m);
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}
static gpointer pingt(gpointer p)
{
GMainContext *ctx = g_main_context_new();
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ipcwatch(svrexe, PING, ctx, NULL);
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g_main_loop_run(g_main_loop_new(ctx, true));
return NULL;
}
void wyebwatch(char *exe, char *caller, wyebdataf func)
{
svrexe = exe;
dataf = func;
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orders = g_hash_table_new(g_str_hash, g_str_equal);
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until(KEEPS);
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g_thread_unref(g_thread_new("ping", pingt, NULL));
ipcwatch(exe, INPUT, g_main_context_default(), NULL);
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if (!ipcsend(CLIDIR, caller, CCwoke, "", NULL))
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fatal(1);
}
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static void monitorcb(GFileMonitor *m, GFile *f, GFile *o, GFileMonitorEvent e,
gpointer p)
{
if (e == G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT)
g_timeout_add(100, quitif, NULL);
}
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static gboolean svrinit(char *caller)
{
wyebwatch(svrexe, caller, dataf);
char path[PATH_MAX];
readlink("/proc/self/exe", path, PATH_MAX);
D(exepath %s, path)
GFile *gf = g_file_new_for_path(path);
GFileMonitor *gm = g_file_monitor_file(
gf, G_FILE_MONITOR_NONE, NULL, NULL);
g_signal_connect(gm, "changed", G_CALLBACK(monitorcb), NULL);
g_object_unref(gf);
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return false;
}
bool wyebsvr(int argc, char **argv, wyebdataf func)
{
if (argc < 2 || !g_str_has_prefix(argv[1], PREFIX)) return false;
svrexe = argv[0];
dataf = func;
sloop = g_main_loop_new(NULL, false);
g_idle_add((GSourceFunc)svrinit, argv[1]);
g_main_loop_run(sloop);
return true;
}
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typedef struct {
char *caller;
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char *data;
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} Dataargs;
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static void getdata(gpointer p, gpointer ap)
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{
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Dataargs *args = p;
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g_mutex_lock(&ordersm);
g_hash_table_add(orders, args->caller);
g_mutex_unlock(&ordersm);
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char *data = dataf(args->data);
if (*args->caller && !ipcsend(CLIDIR, args->caller, CCret, "", data)) fatal(2);
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g_free(data);
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g_mutex_lock(&ordersm);
g_hash_table_remove(orders, args->caller);
g_mutex_unlock(&ordersm);
g_free(args->caller);
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g_free(args->data);
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g_free(args);
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}
//@client
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typedef struct {
GMutex retm;
GMainContext *wctx;
GMainLoop *loop;
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GSource *watch;
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char *pid;
char *retdata;
char *pppath;
char *exe; //do not free. this is tmp
} Client;
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static GSList *rmpath = NULL;
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static GMutex rmm;
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static void __attribute__((destructor)) removepp()
{
for (; rmpath; rmpath = rmpath->next)
remove(rmpath->data);
}
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static Client *makecli()
{
Client *cli = g_new0(Client, 1);
g_mutex_init(&cli->retm);
cli->pid = g_strdup_printf(PREFIX"%d-%d",
getpid(), GPOINTER_TO_INT(g_thread_self()));
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cli->wctx = g_main_context_new();
cli->loop = g_main_loop_new(cli->wctx, true);
cli->watch = ipcwatch(CLIDIR, cli->pid, cli->wctx, cli);
cli->pppath = ipcpath( CLIDIR, cli->pid);
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g_mutex_lock(&rmm);
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rmpath = g_slist_prepend(rmpath, cli->pppath);
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g_mutex_unlock(&rmm);
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g_thread_unref(g_thread_new("wait", (GThreadFunc)g_main_loop_run, cli->loop));
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return cli;
}
static void freecli(Client *cli)
{
g_main_loop_quit(cli->loop);
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g_source_unref(cli->watch);
g_main_loop_unref(cli->loop);
g_main_context_unref(cli->wctx);
g_mutex_clear(&cli->retm);
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g_free(cli->pid);
g_free(cli->retdata);
remove(cli->pppath);
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g_mutex_lock(&rmm);
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rmpath = g_slist_remove(rmpath, cli->pppath);
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g_mutex_unlock(&rmm);
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g_free(cli->pppath);
}
static Client *getcli()
{
static GMutex m;
g_mutex_lock(&m);
static GPrivate pc = G_PRIVATE_INIT((GDestroyNotify)freecli);
Client *cli = g_private_get(&pc);
if (!cli)
{
cli = makecli();
g_private_set(&pc, cli);
}
g_mutex_unlock(&m);
return cli;
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}
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static GHashTable *lastsec = NULL;
static GMutex lastm;
static void setsec(char *exe, int sec)
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{
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g_mutex_lock(&lastm);
if (!lastsec) lastsec = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
g_hash_table_replace(lastsec, g_strdup(exe), g_strdup_printf("%d", sec));
g_mutex_unlock(&lastm);
}
static char *keepstr(char *exe)
{
g_mutex_lock(&lastm);
char *ret = g_hash_table_lookup(lastsec, exe);
g_mutex_unlock(&lastm);
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#define Z(v) #v
return ret ?: Z(KEEPS);
#undef Z
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}
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static gboolean pingloop(Client *cli)
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{
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if (!ipcsend(cli->exe, PING, CSping, cli->pid, keepstr(cli->exe)))
g_mutex_unlock(&cli->retm);
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return true;
}
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static gboolean timeoutcb(Client *cli)
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{
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g_mutex_unlock(&cli->retm);
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return false;
}
//don't free
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static char *request(char *exe, Com type, bool caller, char *data)
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{
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Client *cli = getcli();
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if (caller)
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{
g_mutex_lock(&cli->retm);
g_free(cli->retdata);
cli->retdata = NULL;
}
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if (!ipcsend(exe, INPUT, type, caller ? cli->pid : NULL, data))
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{ //svr is not running
char *path = ipcpath(exe, "lock");
if (!g_file_test(path, G_FILE_TEST_EXISTS))
mkdirif(path);
int lock = open(path, O_RDONLY | O_CREAT, S_IRUSR);
g_free(path);
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flock(lock, LOCK_EX);
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//retry in single proc
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if (!ipcsend(exe, INPUT, type, caller ? cli->pid : NULL, data))
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{
if (!caller)
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g_mutex_lock(&cli->retm);
GSource *tout = g_timeout_source_new(KEEPS * 1000);
g_source_set_callback(tout, (GSourceFunc)timeoutcb, cli, NULL);
g_source_attach(tout, cli->wctx);
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char **argv = g_new0(char*, 3);
argv[0] = exe;
argv[1] = cli->pid;
GError *err = NULL;
if (!g_spawn_async(NULL, argv, NULL, G_SPAWN_SEARCH_PATH,
NULL, NULL, NULL, &err))
{
g_print("err %s", err->message);
g_error_free(err);
}
g_free(argv);
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g_mutex_lock(&cli->retm);
g_mutex_unlock(&cli->retm);
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g_source_destroy(tout);
g_source_unref(tout);
//wyebloop doesn't know svr quits
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wyebkeep(exe, 0);
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if (caller)
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g_mutex_lock(&cli->retm);
if (!ipcsend(exe, INPUT, type, caller ? cli->pid : NULL, data))
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P(Spawning %s failed !!, exe)
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}
close(lock);
}
if (caller)
{
GSource *ping = g_timeout_source_new(DPINGTIME);
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cli->exe = exe;
g_source_set_callback(ping, (GSourceFunc)pingloop, cli, NULL);
g_source_attach(ping, cli->wctx); //attach to ping thread
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g_mutex_lock(&cli->retm);
g_mutex_unlock(&cli->retm);
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g_source_destroy(ping);
g_source_unref(ping);
}
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return cli->retdata;
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}
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char *wyebget(char *exe, char *data)
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{
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return request(exe, CSdata, true, data);
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}
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void wyebsend(char *exe, char *data)
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{
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request(exe, CSdata, false, data);
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}
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static gboolean keepcb(char *exe)
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{
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request(exe, CSuntil, false, keepstr(exe));
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return false;
}
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void wyebkeep(char *exe, int sec)
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{
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if (sec) setsec(exe, sec);
g_idle_add_full(G_PRIORITY_DEFAULT, (GSourceFunc)keepcb,
g_strdup(exe), g_free);
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}
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static gboolean loopcb(char *exe)
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{
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keepcb(exe);
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return true;
}
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guint wyebloop(char *exe, int sec)
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{
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if (sec) setsec(exe, sec);
loopcb(exe);
return g_timeout_add_full(G_PRIORITY_DEFAULT, sec * 300,
(GSourceFunc)loopcb, g_strdup(exe), g_free);
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}
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#if DEBUG
static void testget(gpointer p, gpointer ap)
{
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D(ret %s - %s, wyebget(ap, p), (char *)p)
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g_free(p);
}
#endif
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static gboolean tcinputcb(GIOChannel *ch, GIOCondition c, char *exe)
{
char *line;
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if (c == G_IO_HUP || G_IO_STATUS_EOF ==
g_io_channel_read_line(ch, &line, NULL, NULL, NULL))
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exit(0);
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if (!line) return true;
g_strstrip(line);
if (!strlen(line))
exit(0);
#if DEBUG
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if (g_str_has_prefix(line, "l"))
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{
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GThreadPool *pool = g_thread_pool_new(testget, exe, 44, false, NULL);
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start = g_get_monotonic_time();
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for (int i = 0; i < 100000; i++)
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{
char *is = g_strdup_printf("l%d", i);
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//g_print("loop %d ret %s\n", i, wyebget(exe, is));
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if (*(line + 1) == 's')
wyebsend(exe, is);
else if (*(line + 1) == 'p')
D(pint %s, is)
else
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g_thread_pool_push(pool, g_strdup(is), NULL);
// wyebget(exe, is);
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g_free(is);
}
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g_thread_pool_free(pool, false, true);
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gint64 now = g_get_monotonic_time();
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D(time %f, (now - start) / 1000000.0)
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}
else
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g_print("RET is %s\n", wyebget(exe, line));
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#else
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g_print("%s\n", wyebget(exe, line)); //don't free
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#endif
g_free(line);
return true;
}
static gboolean tcinit(char *exe)
{
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#if DEBUG
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wyebloop(exe, 300);
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#else
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wyebloop(exe, 2);
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#endif
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GIOChannel *io = g_io_channel_unix_new(fileno(stdin));
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g_io_add_watch(io, G_IO_IN | G_IO_HUP, (GIOFunc)tcinputcb, exe);
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return false;
}
void wyebclient(char *exe)
{
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GMainLoop *loop = g_main_loop_new(NULL, false);
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g_idle_add((GSourceFunc)tcinit, exe);
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g_main_loop_run(loop);
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}
//@ipccb
gboolean ipccb(GIOChannel *ch, GIOCondition c, gpointer p)
{
char *line;
g_io_channel_read_line(ch, &line, NULL, NULL, NULL);
if (!line) return true;
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Com type = *line;
char *id = line + 1;
char *data = strchr(line, ':');
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*data++ = '\0';
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g_strchomp(data);
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#if DEBUG
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// static int i = 0;
// D(%c ipccb%d %c/%s/%s;, svrexe ? 'S':'C', i++, type ,id ,data)
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#endif
switch (type) {
//server
case CSdata:
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{
Dataargs *args = g_new(Dataargs, 1);
args->caller = g_strdup(id);
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args->data = g_strcompress(data);
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static GThreadPool *pool = NULL;
if (!pool) pool = g_thread_pool_new(getdata, NULL, -1, false, NULL);
g_thread_pool_push(pool, args, NULL);
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break;
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}
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case CSping:
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g_mutex_lock(&ordersm);
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if (!g_hash_table_lookup(orders, id))
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ipcsend(CLIDIR, id, CClost, NULL, NULL);
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g_mutex_unlock(&ordersm);
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case CSuntil:
until(atoi(data));
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break;
//client
case CCret:
case CClost:
case CCwoke:
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{
Client *cli = p;
if (type == CCret)
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cli->retdata = g_strcompress(data);
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//for the case pinging at same time of ret
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g_mutex_trylock(&cli->retm);
g_mutex_unlock(&cli->retm);
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break;
}
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}
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g_free(line);
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return true;
}
//test
#if DEBUG
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static char *testdata(char *data)
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{
//sleep(9);
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//g_free(data); //makes crash
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static int i = 0;
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return g_strdup_printf("%d th test data. req is %s", ++i, data);
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}
int main(int argc, char **argv)
{
start = g_get_monotonic_time();
// gint64 now = g_get_monotonic_time();
// D(time %ld %ld, now - start, now)
if (!wyebsvr(argc, argv, testdata))
wyebclient(argv[0]);
exit(0);
}
#endif