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alarm.c
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alarm.c
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#include "../uwsgi.h"
extern struct uwsgi_server uwsgi;
// generate a uwsgi signal on alarm
void uwsgi_alarm_init_signal(struct uwsgi_alarm_instance *uai) {
uai->data8 = atoi(uai->arg);
}
void uwsgi_alarm_func_signal(struct uwsgi_alarm_instance *uai, char *msg, size_t len) {
uwsgi_route_signal(uai->data8);
}
// run a command on alarm
void uwsgi_alarm_init_cmd(struct uwsgi_alarm_instance *uai) {
uai->data_ptr = uai->arg;
}
void uwsgi_alarm_func_cmd(struct uwsgi_alarm_instance *uai, char *msg, size_t len) {
int pipe[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe)) {
return;
}
uwsgi_socket_nb(pipe[0]);
uwsgi_socket_nb(pipe[1]);
if (write(pipe[1], msg, len) != (ssize_t) len) {
close(pipe[0]);
close(pipe[1]);
return;
}
uwsgi_run_command(uai->data_ptr, pipe, -1);
close(pipe[0]);
close(pipe[1]);
}
// pass the log line to a mule
void uwsgi_alarm_init_mule(struct uwsgi_alarm_instance *uai) {
uai->data32 = atoi(uai->arg);
if (uai->data32 > (uint32_t) uwsgi.mules_cnt) {
uwsgi_log_alarm("] invalid mule_id (%d mules available), fallback to 0\n", uwsgi.mules_cnt);
uai->data32 = 0;
}
}
void uwsgi_alarm_func_mule(struct uwsgi_alarm_instance *uai, char *msg, size_t len) {
// skip if mules are not available
if (uwsgi.mules_cnt == 0)
return;
int fd = uwsgi.shared->mule_queue_pipe[0];
if (uai->data32 > 0) {
int mule_id = uai->data32 - 1;
fd = uwsgi.mules[mule_id].queue_pipe[0];
}
mule_send_msg(fd, msg, len);
}
// register a new alarm
void uwsgi_register_alarm(char *name, void (*init) (struct uwsgi_alarm_instance *), void (*func) (struct uwsgi_alarm_instance *, char *, size_t)) {
struct uwsgi_alarm *old_ua = NULL, *ua = uwsgi.alarms;
while (ua) {
// skip already initialized alarms
if (!strcmp(ua->name, name)) {
return;
}
old_ua = ua;
ua = ua->next;
}
ua = uwsgi_calloc(sizeof(struct uwsgi_alarm));
ua->name = name;
ua->init = init;
ua->func = func;
if (old_ua) {
old_ua->next = ua;
}
else {
uwsgi.alarms = ua;
}
}
// register embedded alarms
void uwsgi_register_embedded_alarms() {
uwsgi_register_alarm("signal", uwsgi_alarm_init_signal, uwsgi_alarm_func_signal);
uwsgi_register_alarm("cmd", uwsgi_alarm_init_cmd, uwsgi_alarm_func_cmd);
uwsgi_register_alarm("mule", uwsgi_alarm_init_mule, uwsgi_alarm_func_mule);
}
static int uwsgi_alarm_add(char *name, char *plugin, char *arg) {
struct uwsgi_alarm *ua = uwsgi.alarms;
while (ua) {
if (!strcmp(ua->name, plugin)) {
break;
}
ua = ua->next;
}
if (!ua)
return -1;
struct uwsgi_alarm_instance *old_uai = NULL, *uai = uwsgi.alarm_instances;
while (uai) {
old_uai = uai;
uai = uai->next;
}
uai = uwsgi_calloc(sizeof(struct uwsgi_alarm_instance));
uai->name = name;
uai->alarm = ua;
uai->arg = arg;
uai->last_msg = uwsgi_malloc(uwsgi.log_master_bufsize);
if (old_uai) {
old_uai->next = uai;
}
else {
uwsgi.alarm_instances = uai;
}
ua->init(uai);
return 0;
}
// get an alarm instance by its name
static struct uwsgi_alarm_instance *uwsgi_alarm_get_instance(char *name) {
struct uwsgi_alarm_instance *uai = uwsgi.alarm_instances;
while (uai) {
if (!strcmp(name, uai->name)) {
return uai;
}
uai = uai->next;
}
return NULL;
}
static int uwsgi_alarm_log_add(char *alarms, char *regexp, int negate) {
struct uwsgi_alarm_log *old_ual = NULL, *ual = uwsgi.alarm_logs;
while (ual) {
old_ual = ual;
ual = ual->next;
}
ual = uwsgi_calloc(sizeof(struct uwsgi_alarm_log));
if (uwsgi_regexp_build(regexp, &ual->pattern, &ual->pattern_extra)) {
return -1;
}
ual->negate = negate;
if (old_ual) {
old_ual->next = ual;
}
else {
uwsgi.alarm_logs = ual;
}
// map instances to the log
char *list = uwsgi_str(alarms);
char *p = strtok(list, ",");
while (p) {
struct uwsgi_alarm_instance *uai = uwsgi_alarm_get_instance(p);
if (!uai)
return -1;
struct uwsgi_alarm_ll *old_uall = NULL, *uall = ual->alarms;
while (uall) {
old_uall = uall;
uall = uall->next;
}
uall = uwsgi_calloc(sizeof(struct uwsgi_alarm_ll));
uall->alarm = uai;
if (old_uall) {
old_uall->next = uall;
}
else {
ual->alarms = uall;
}
p = strtok(NULL, ",");
}
return 0;
}
// initialize alarms, instances and log regexps
void uwsgi_alarms_init() {
// first of all, create instance of alarms
struct uwsgi_string_list *usl = uwsgi.alarm_list;
while (usl) {
char *line = uwsgi_str(usl->value);
char *space = strchr(line, ' ');
if (!space) {
uwsgi_log("invalid alarm syntax: %s\n", usl->value);
exit(1);
}
*space = 0;
char *plugin = space + 1;
char *colon = strchr(plugin, ':');
if (!colon) {
uwsgi_log("invalid alarm syntax: %s\n", usl->value);
exit(1);
}
*colon = 0;
char *arg = colon + 1;
// here the alarm is mapped to a name and initialized
if (uwsgi_alarm_add(line, plugin, arg)) {
uwsgi_log("invalid alarm: %s\n", usl->value);
exit(1);
}
usl = usl->next;
}
// then map log-alarm
usl = uwsgi.alarm_logs_list;
while (usl) {
char *line = uwsgi_str(usl->value);
char *space = strchr(line, ' ');
if (!space) {
uwsgi_log("invalid log-alarm syntax: %s\n", usl->value);
exit(1);
}
*space = 0;
char *regexp = space + 1;
// here the log-alarm is created
if (uwsgi_alarm_log_add(line, regexp, usl->custom)) {
uwsgi_log("invalid log-alarm: %s\n", usl->value);
exit(1);
}
usl = usl->next;
}
}
// check if a log should raise an alarm
void uwsgi_alarm_log_check(char *msg, size_t len) {
if (!uwsgi_strncmp(msg, len, "[uwsgi-alarm", 12))
return;
struct uwsgi_alarm_log *ual = uwsgi.alarm_logs;
while (ual) {
if (uwsgi_regexp_match(ual->pattern, ual->pattern_extra, msg, len) >= 0) {
if (!ual->negate) {
uwsgi_alarm_log_run(ual, msg, len);
}
else {
break;
}
}
ual = ual->next;
}
}
// call the alarm func
void uwsgi_alarm_run(struct uwsgi_alarm_instance *uai, char *msg, size_t len) {
time_t now = uwsgi_now();
// avoid alarm storming/loop if last message is the same
if (!uwsgi_strncmp(msg, len, uai->last_msg, uai->last_msg_size)) {
if (now - uai->last_run < uwsgi.alarm_freq)
return;
}
uai->alarm->func(uai, msg, len);
uai->last_run = uwsgi_now();
memcpy(uai->last_msg, msg, len);
uai->last_msg_size = len;
}
// call the alarms mapped to a log line
void uwsgi_alarm_log_run(struct uwsgi_alarm_log *ual, char *msg, size_t len) {
struct uwsgi_alarm_ll *uall = ual->alarms;
while (uall) {
uwsgi_alarm_run(uall->alarm, msg, len);
uall = uall->next;
}
}