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logger.c
1123 lines (991 loc) · 38 KB
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logger.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <poll.h>
#include <ctype.h>
#include <stdarg.h>
#if defined(__sun)
#include <atomic.h>
#endif
#include "memcached.h"
#include "bipbuffer.h"
#ifdef LOGGER_DEBUG
#define L_DEBUG(...) \
do { \
fprintf(stderr, __VA_ARGS__); \
} while (0)
#else
#define L_DEBUG(...)
#endif
/* TODO: put this in a struct and ditch the global vars. */
static logger *logger_stack_head = NULL;
static logger *logger_stack_tail = NULL;
static unsigned int logger_count = 0;
static volatile int do_run_logger_thread = 1;
static pthread_t logger_tid;
pthread_mutex_t logger_stack_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t logger_stack_cond = PTHREAD_COND_INITIALIZER;
pthread_key_t logger_key;
#if !defined(HAVE_GCC_64ATOMICS) && !defined(__sun)
pthread_mutex_t logger_atomics_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#define WATCHER_LIMIT 20
logger_watcher *watchers[20];
struct pollfd watchers_pollfds[20];
int watcher_count = 0;
#define WATCHER_ALL -1
static int logger_thread_poll_watchers(int force_poll, int watcher);
/* helpers for logger_log */
static void _logger_log_text(logentry *e, const entry_details *d, const void *entry, va_list ap) {
int reqlen = d->reqlen;
int total = vsnprintf((char *) e->data, reqlen, d->format, ap);
if (total <= 0) {
fprintf(stderr, "LOGGER: Failed to vsnprintf a text entry: (total) %d\n", total);
}
e->size = total + 1; // null byte
}
static void _logger_log_evictions(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
struct logentry_eviction *le = (struct logentry_eviction *) e->data;
le->exptime = (it->exptime > 0) ? (long long int)(it->exptime - current_time) : (long long int) -1;
le->latime = current_time - it->time;
le->it_flags = it->it_flags;
le->nkey = it->nkey;
le->nbytes = it->nbytes;
le->clsid = ITEM_clsid(it);
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_eviction) + le->nkey;
}
#ifdef EXTSTORE
static void _logger_log_ext_write(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
int ew_bucket = va_arg(ap, int);
struct logentry_ext_write *le = (struct logentry_ext_write *) e->data;
le->exptime = (it->exptime > 0) ? (long long int)(it->exptime - current_time) : (long long int) -1;
le->latime = current_time - it->time;
le->it_flags = it->it_flags;
le->nkey = it->nkey;
le->clsid = ITEM_clsid(it);
le->bucket = (uint8_t)ew_bucket;
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_ext_write) + le->nkey;
}
#endif
// 0 == nf, 1 == found. 2 == flushed. 3 == expired.
// might be useful to store/print the flags an item has?
// could also collapse this and above code into an "item status" struct. wait
// for more endpoints to be written before making it generic, though.
static void _logger_log_item_get(logentry *e, const entry_details *d, const void *entry, va_list ap) {
int was_found = va_arg(ap, int);
char *key = va_arg(ap, char *);
int nkey = va_arg(ap, int);
int nbytes = va_arg(ap, int);
uint8_t clsid = va_arg(ap, int);
int sfd = va_arg(ap, int);
struct logentry_item_get *le = (struct logentry_item_get *) e->data;
le->was_found = was_found;
le->nkey = nkey;
le->nbytes = nbytes;
le->clsid = clsid;
memcpy(le->key, key, nkey);
le->sfd = sfd;
e->size = sizeof(struct logentry_item_get) + nkey;
}
static void _logger_log_item_store(logentry *e, const entry_details *d, const void *entry, va_list ap) {
enum store_item_type status = va_arg(ap, enum store_item_type);
int comm = va_arg(ap, int);
char *key = va_arg(ap, char *);
int nkey = va_arg(ap, int);
int nbytes = va_arg(ap, int);
rel_time_t ttl = va_arg(ap, rel_time_t);
uint8_t clsid = va_arg(ap, int);
int sfd = va_arg(ap, int);
struct logentry_item_store *le = (struct logentry_item_store *) e->data;
le->status = status;
le->cmd = comm;
le->nkey = nkey;
le->nbytes = nbytes;
le->clsid = clsid;
if (ttl != 0) {
le->ttl = ttl - current_time;
} else {
le->ttl = 0;
}
memcpy(le->key, key, nkey);
le->sfd = sfd;
e->size = sizeof(struct logentry_item_store) + nkey;
}
static void _logger_log_item_deleted(logentry *e, const entry_details *d, const void *entry, va_list ap) {
item *it = (item *)entry;
int comm = va_arg(ap, int);
struct logentry_deletion *le = (struct logentry_deletion *) e->data;
le->nkey = it->nkey;
le->cmd = comm;
le->nbytes = it->nbytes;
le->clsid = ITEM_clsid(it);
memcpy(le->key, ITEM_key(it), it->nkey);
e->size = sizeof(struct logentry_deletion) + le->nkey;
}
static void _logger_log_conn_event(logentry *e, const entry_details *d, const void *entry, va_list ap) {
struct sockaddr_in6 *addr = va_arg(ap, struct sockaddr_in6 *);
socklen_t addrlen = va_arg(ap, socklen_t);
enum network_transport transport = va_arg(ap, enum network_transport);
enum close_reasons reason = va_arg(ap, enum close_reasons);
int sfd = va_arg(ap, int);
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
memcpy(&le->addr, addr, addrlen);
le->sfd = sfd;
le->transport = transport;
le->reason = reason;
e->size = sizeof(struct logentry_conn_event);
}
/*************************
* Util functions used by the logger background thread
*************************/
static int _logger_util_addr_endpoint(struct sockaddr_in6 *addr, char *rip,
size_t riplen, unsigned short *rport) {
memset(rip, 0, riplen);
*rport = 0;
switch (addr->sin6_family) {
case AF_INET:
inet_ntop(AF_INET, &((struct sockaddr_in *) addr)->sin_addr,
rip, riplen - 1);
*rport = ntohs(((struct sockaddr_in *) addr)->sin_port);
break;
case AF_INET6:
inet_ntop(AF_INET6, &((struct sockaddr_in6 *) addr)->sin6_addr,
rip, riplen - 1);
*rport = ntohs(((struct sockaddr_in6 *) addr)->sin6_port);
break;
#ifndef DISABLE_UNIX_SOCKET
// Connections on Unix socket transports have c->request_addr zeroed out.
case AF_UNSPEC:
case AF_UNIX:
strncpy(rip, "unix", strlen("unix") + 1);
break;
#endif // #ifndef DISABLE_UNIX_SOCKET
}
return 0;
}
/*************************
* Logger background thread functions. Aggregates per-worker buffers and
* writes to any watchers.
*************************/
#define LOGGER_PARSE_SCRATCH 4096
static int _logger_parse_text(logentry *e, char *scratch) {
return snprintf(scratch, LOGGER_PARSE_SCRATCH, "ts=%lld.%d gid=%llu %s\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec,
(unsigned long long) e->gid, (char *) e->data);
}
static int _logger_parse_ise(logentry *e, char *scratch) {
int total;
const char *cmd = "na";
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_item_store *le = (struct logentry_item_store *) e->data;
const char * const status_map[] = {
"not_stored", "stored", "exists", "not_found", "too_large", "no_memory" };
const char * const cmd_map[] = {
"null", "add", "set", "replace", "append", "prepend", "cas", "append", "prepend" };
if (le->cmd <= 8)
cmd = cmd_map[le->cmd];
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=item_store key=%s status=%s cmd=%s ttl=%u clsid=%u cfd=%d size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, status_map[le->status], cmd, le->ttl, le->clsid, le->sfd,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ige(logentry *e, char *scratch) {
int total;
struct logentry_item_get *le = (struct logentry_item_get *) e->data;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
const char * const was_found_map[] = {
"not_found", "found", "flushed", "expired" };
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=item_get key=%s status=%s clsid=%u cfd=%d size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, was_found_map[le->was_found], le->clsid, le->sfd,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ee(logentry *e, char *scratch) {
int total;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_eviction *le = (struct logentry_eviction *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=eviction key=%s fetch=%s ttl=%lld la=%d clsid=%u size=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, (le->it_flags & ITEM_FETCHED) ? "yes" : "no",
(long long int)le->exptime, le->latime, le->clsid,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
static int _logger_parse_ide(logentry *e, char *scratch) {
int total;
const char *cmd = "na";
const char * const cmd_map[] = {
"null", "delete", "md" };
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_deletion *le = (struct logentry_deletion *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
if (le->cmd <= 2)
cmd = cmd_map[le->cmd];
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%d.%d gid=%llu type=deleted key=%s cmd=%s clsid=%u size=%d\n",
(int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, cmd, le->clsid,
le->nbytes > 0 ? le->nbytes - 2 : 0); // CLRF
return total;
}
#ifdef EXTSTORE
static int _logger_parse_extw(logentry *e, char *scratch) {
int total;
char keybuf[KEY_MAX_URI_ENCODED_LENGTH];
struct logentry_ext_write *le = (struct logentry_ext_write *) e->data;
uriencode(le->key, keybuf, le->nkey, KEY_MAX_URI_ENCODED_LENGTH);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=extwrite key=%s fetch=%s ttl=%lld la=%d clsid=%u bucket=%u\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
keybuf, (le->it_flags & ITEM_FETCHED) ? "yes" : "no",
(long long int)le->exptime, le->latime, le->clsid, le->bucket);
return total;
}
#endif
static int _logger_parse_cne(logentry *e, char *scratch) {
int total;
unsigned short rport = 0;
char rip[64];
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
const char * const transport_map[] = { "local", "tcp", "udp" };
_logger_util_addr_endpoint(&le->addr, rip, sizeof(rip), &rport);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=conn_new rip=%s rport=%hu transport=%s cfd=%d\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
rip, rport, transport_map[le->transport], le->sfd);
return total;
}
static int _logger_parse_cce(logentry *e, char *scratch) {
int total;
unsigned short rport = 0;
char rip[64];
struct logentry_conn_event *le = (struct logentry_conn_event *) e->data;
const char * const transport_map[] = { "local", "tcp", "udp" };
const char * const reason_map[] = { "error", "normal", "idle_timeout", "shutdown" };
_logger_util_addr_endpoint(&le->addr, rip, sizeof(rip), &rport);
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=conn_close rip=%s rport=%hu transport=%s reason=%s cfd=%d\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
rip, rport, transport_map[le->transport],
reason_map[le->reason], le->sfd);
return total;
}
#ifdef PROXY
// TODO (v2): the length caps here are all magic numbers. Haven't thought of
// something yet that I like better.
// Should at least make a define to the max log len (1024) and do some math
// here.
static void _logger_log_proxy_req(logentry *e, const entry_details *d, const void *entry, va_list ap) {
char *req = va_arg(ap, char *);
int reqlen = va_arg(ap, uint32_t);
long elapsed = va_arg(ap, long);
unsigned short type = va_arg(ap, int);
unsigned short code = va_arg(ap, int);
int status = va_arg(ap, int);
int conn_fd = va_arg(ap, int);
char *detail = va_arg(ap, char *);
int dlen = va_arg(ap, int);
char *be_name = va_arg(ap, char *);
char *be_port = va_arg(ap, char *);
struct logentry_proxy_req *le = (void *)e->data;
le->type = type;
le->code = code;
le->status = status;
le->conn_fd = conn_fd;
le->dlen = dlen;
le->elapsed = elapsed;
if (be_name && be_port) {
le->be_namelen = strlen(be_name);
le->be_portlen = strlen(be_port);
} else {
le->be_namelen = 0;
le->be_portlen = 0;
}
char *data = le->data;
if (req[reqlen-2] == '\r') {
reqlen -= 2;
} else {
reqlen--;
}
if (reqlen > 300) {
reqlen = 300;
}
if (dlen > 150) {
dlen = 150;
}
// be_namelen and be_portlen can't be longer than 255+6
le->reqlen = reqlen;
memcpy(data, req, reqlen);
data += reqlen;
memcpy(data, detail, dlen);
data += dlen;
memcpy(data, be_name, le->be_namelen);
data += le->be_namelen;
memcpy(data, be_port, le->be_portlen);
e->size = sizeof(struct logentry_proxy_req) + reqlen + dlen + le->be_namelen + le->be_portlen;
}
static int _logger_parse_prx_req(logentry *e, char *scratch) {
int total;
struct logentry_proxy_req *le = (void *)e->data;
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_req elapsed=%lu type=%d code=%d status=%d cfd=%d be=%.*s:%.*s detail=%.*s req=%.*s\n",
(long long int) e->tv.tv_sec, (int) e->tv.tv_usec, (unsigned long long) e->gid,
le->elapsed, le->type, le->code, le->status, le->conn_fd,
(int)le->be_namelen, le->data+le->reqlen+le->dlen,
(int)le->be_portlen, le->data+le->reqlen+le->dlen+le->be_namelen, // fml.
(int)le->dlen, le->data+le->reqlen, (int)le->reqlen, le->data
);
return total;
}
#define MAX_RBUF_READ 100
static void _logger_log_proxy_errbe(logentry *e, const entry_details *d, const void *entry, va_list ap) {
char *errmsg = va_arg(ap, char *);
char *be_name = va_arg(ap, char *);
char *be_port = va_arg(ap, char *);
char *be_label = va_arg(ap, char *);
int be_depth = va_arg(ap, int);
char *be_rbuf = va_arg(ap, char *);
int be_rbuflen = va_arg(ap, int);
int be_retry = va_arg(ap, int);
struct logentry_proxy_errbe *le = (void *)e->data;
le->be_depth = be_depth;
le->retry = be_retry;
le->errlen = strlen(errmsg);
if (be_name && be_port) {
le->be_namelen = strlen(be_name);
le->be_portlen = strlen(be_port);
}
if (be_label) {
le->be_labellen = strlen(be_label);
}
le->be_rbuflen = be_rbuflen;
if (be_rbuflen > MAX_RBUF_READ) {
le->be_rbuflen = MAX_RBUF_READ;
}
char *data = le->data;
memcpy(data, errmsg, le->errlen);
data += le->errlen;
memcpy(data, be_name, le->be_namelen);
data += le->be_namelen;
memcpy(data, be_port, le->be_portlen);
data += le->be_portlen;
memcpy(data, be_label, le->be_labellen);
data += le->be_labellen;
memcpy(data, be_rbuf, le->be_rbuflen);
data += le->be_rbuflen;
e->size = sizeof(struct logentry_proxy_errbe) + (data - le->data);
}
static int _logger_parse_prx_errbe(logentry *e, char *scratch) {
int total;
char rbuf[MAX_RBUF_READ * 3]; // x 3 for worst case URI encoding.
struct logentry_proxy_errbe *le = (void *)e->data;
char *data = le->data;
char *errmsg = data;
data += le->errlen;
char *be_name = data;
data += le->be_namelen;
char *be_port = data;
data += le->be_portlen;
char *be_label = data;
data += le->be_labellen;
char *be_rbuf = data;
uriencode(be_rbuf, rbuf, le->be_rbuflen, MAX_RBUF_READ * 3);
if (le->retry) {
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_backend error=%.*s name=%.*s port=%.*s label=%.*s retry=%d\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
(int)le->errlen, errmsg, (int)le->be_namelen, be_name,
(int)le->be_portlen, be_port, (int)le->be_labellen, be_label, le->retry);
} else {
total = snprintf(scratch, LOGGER_PARSE_SCRATCH,
"ts=%lld.%d gid=%llu type=proxy_backend error=%.*s name=%.*s port=%.*s label=%.*s depth=%d rbuf=%s\n",
(long long int)e->tv.tv_sec, (int)e->tv.tv_usec, (unsigned long long) e->gid,
(int)le->errlen, errmsg, (int)le->be_namelen, be_name,
(int)le->be_portlen, be_port, (int)le->be_labellen, be_label, le->be_depth, rbuf);
}
return total;
}
#endif
/* Should this go somewhere else? */
static const entry_details default_entries[] = {
[LOGGER_ASCII_CMD] = {512, LOG_RAWCMDS, _logger_log_text, _logger_parse_text, "<%d %s"},
[LOGGER_EVICTION] = {512, LOG_EVICTIONS, _logger_log_evictions, _logger_parse_ee, NULL},
[LOGGER_ITEM_GET] = {512, LOG_FETCHERS, _logger_log_item_get, _logger_parse_ige, NULL},
[LOGGER_ITEM_STORE] = {512, LOG_MUTATIONS, _logger_log_item_store, _logger_parse_ise, NULL},
[LOGGER_CRAWLER_STATUS] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=lru_crawler crawler=%d lru=%s low_mark=%llu next_reclaims=%llu since_run=%u next_run=%d elapsed=%u examined=%llu reclaimed=%llu"
},
[LOGGER_SLAB_MOVE] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=slab_move src=%d dst=%d"
},
[LOGGER_CONNECTION_NEW] = {512, LOG_CONNEVENTS, _logger_log_conn_event, _logger_parse_cne, NULL},
[LOGGER_CONNECTION_CLOSE] = {512, LOG_CONNEVENTS, _logger_log_conn_event, _logger_parse_cce, NULL},
[LOGGER_DELETIONS] = {512, LOG_DELETIONS, _logger_log_item_deleted, _logger_parse_ide, NULL},
#ifdef EXTSTORE
[LOGGER_EXTSTORE_WRITE] = {512, LOG_EVICTIONS, _logger_log_ext_write, _logger_parse_extw, NULL},
[LOGGER_COMPACT_START] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_start id=%lu version=%llu"
},
[LOGGER_COMPACT_ABORT] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_abort id=%lu"
},
[LOGGER_COMPACT_READ_START] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_read_start id=%lu offset=%llu"
},
[LOGGER_COMPACT_READ_END] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_read_end id=%lu offset=%llu rescues=%lu lost=%lu skipped=%lu"
},
[LOGGER_COMPACT_END] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_end id=%lu"
},
[LOGGER_COMPACT_FRAGINFO] = {512, LOG_SYSEVENTS, _logger_log_text, _logger_parse_text,
"type=compact_fraginfo ratio=%.2f bytes=%lu"
},
#endif
#ifdef PROXY
[LOGGER_PROXY_CONFIG] = {512, LOG_PROXYEVENTS, _logger_log_text, _logger_parse_text,
"type=proxy_conf status=%s"
},
[LOGGER_PROXY_REQ] = {1024, LOG_PROXYREQS, _logger_log_proxy_req, _logger_parse_prx_req, NULL},
[LOGGER_PROXY_ERROR] = {512, LOG_PROXYEVENTS, _logger_log_text, _logger_parse_text,
"type=proxy_error msg=%s"
},
[LOGGER_PROXY_USER] = {512, LOG_PROXYUSER, _logger_log_text, _logger_parse_text,
"type=proxy_user msg=%s"
},
[LOGGER_PROXY_BE_ERROR] = {512, LOG_PROXYEVENTS, _logger_log_proxy_errbe, _logger_parse_prx_errbe,
NULL
},
#endif
};
/*************************
* Util functions shared between bg thread and workers
*************************/
/* Logger GID's can be used by watchers to put logs back into strict order
*/
static uint64_t logger_gid = 0;
uint64_t logger_get_gid(void) {
#ifdef HAVE_GCC_64ATOMICS
return __sync_add_and_fetch(&logger_gid, 1);
#elif defined(__sun)
return atomic_inc_64_nv(&logger_gid);
#else
mutex_lock(&logger_atomics_mutex);
uint64_t res = ++logger_gid;
mutex_unlock(&logger_atomics_mutex);
return res;
#endif
}
void logger_set_gid(uint64_t gid) {
#ifdef HAVE_GCC_64ATOMICS
__sync_add_and_fetch(&logger_gid, gid);
#elif defined(__sun)
atomic_add_64(&logger_gid);
#else
mutex_lock(&logger_atomics_mutex);
logger_gid = gid;
mutex_unlock(&logger_atomics_mutex);
#endif
}
/* TODO: genericize lists. would be nice to import queue.h if the impact is
* studied... otherwise can just write a local one.
*/
/* Add to the list of threads with a logger object */
static void logger_link_q(logger *l) {
pthread_mutex_lock(&logger_stack_lock);
assert(l != logger_stack_head);
l->prev = 0;
l->next = logger_stack_head;
if (l->next) l->next->prev = l;
logger_stack_head = l;
if (logger_stack_tail == 0) logger_stack_tail = l;
logger_count++;
pthread_mutex_unlock(&logger_stack_lock);
return;
}
/* Remove from the list of threads with a logger object */
/*static void logger_unlink_q(logger *l) {
pthread_mutex_lock(&logger_stack_lock);
if (logger_stack_head == l) {
assert(l->prev == 0);
logger_stack_head = l->next;
}
if (logger_stack_tail == l) {
assert(l->next == 0);
logger_stack_tail = l->prev;
}
assert(l->next != l);
assert(l->prev != l);
if (l->next) l->next->prev = l->prev;
if (l->prev) l->prev->next = l->next;
logger_count--;
pthread_mutex_unlock(&logger_stack_lock);
return;
}*/
/* Called with logger stack locked.
* Iterates over every watcher collecting enabled flags.
*/
static void logger_set_flags(void) {
logger *l = NULL;
int x = 0;
uint16_t f = 0; /* logger eflags */
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL)
continue;
f |= w->eflags;
}
for (l = logger_stack_head; l != NULL; l=l->next) {
pthread_mutex_lock(&l->mutex);
l->eflags = f;
pthread_mutex_unlock(&l->mutex);
}
return;
}
/* Completes rendering of log line. */
static enum logger_parse_entry_ret logger_thread_parse_entry(logentry *e, struct logger_stats *ls,
char *scratch, int *scratch_len) {
int total = 0;
const entry_details *d = &default_entries[e->event];
assert(d->parse_cb != NULL);
total = d->parse_cb(e, scratch);
if (total >= LOGGER_PARSE_SCRATCH || total <= 0) {
L_DEBUG("LOGGER: Failed to flatten log entry!\n");
return LOGGER_PARSE_ENTRY_FAILED;
} else {
*scratch_len = total;
}
return LOGGER_PARSE_ENTRY_OK;
}
/* Writes flattened entry to available watchers */
static void logger_thread_write_entry(logentry *e, struct logger_stats *ls,
char *scratch, int scratch_len) {
int x, total;
/* Write the line into available watchers with matching flags */
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
char *skip_scr = NULL;
if (w == NULL || (e->eflags & w->eflags) == 0 || (e->gid < w->min_gid))
continue;
/* Avoid poll()'ing constantly when buffer is full by resetting a
* flag periodically.
*/
while (!w->failed_flush &&
(skip_scr = (char *) bipbuf_request(w->buf, scratch_len + 128)) == NULL) {
if (logger_thread_poll_watchers(0, x) <= 0) {
L_DEBUG("LOGGER: Watcher had no free space for line of size (%d)\n", scratch_len + 128);
w->failed_flush = true;
}
}
if (w->failed_flush) {
L_DEBUG("LOGGER: Fast skipped for watcher [%d] due to failed_flush\n", w->sfd);
w->skipped++;
ls->watcher_skipped++;
continue;
}
if (w->skipped > 0) {
total = snprintf(skip_scr, 128, "skipped=%llu\n", (unsigned long long) w->skipped);
if (total >= 128 || total <= 0) {
L_DEBUG("LOGGER: Failed to flatten skipped message into watcher [%d]\n", w->sfd);
w->skipped++;
ls->watcher_skipped++;
continue;
}
bipbuf_push(w->buf, total);
w->skipped = 0;
}
/* Can't fail because bipbuf_request succeeded. */
bipbuf_offer(w->buf, (unsigned char *) scratch, scratch_len);
ls->watcher_sent++;
}
}
/* Called with logger stack locked.
* Releases every chunk associated with a watcher and closes the connection.
* We can't presently send a connection back to the worker for further
* processing.
*/
static void logger_thread_close_watcher(logger_watcher *w) {
L_DEBUG("LOGGER: Closing dead watcher\n");
watchers[w->id] = NULL;
sidethread_conn_close(w->c);
watcher_count--;
bipbuf_free(w->buf);
free(w);
logger_set_flags();
}
/* Reads a particular worker thread's available bipbuf bytes. Parses each log
* entry into the watcher buffers.
*/
static int logger_thread_read(logger *l, struct logger_stats *ls) {
unsigned int size;
unsigned int pos = 0;
unsigned char *data;
char scratch[LOGGER_PARSE_SCRATCH];
logentry *e;
pthread_mutex_lock(&l->mutex);
data = bipbuf_peek_all(l->buf, &size);
pthread_mutex_unlock(&l->mutex);
if (data == NULL) {
return 0;
}
L_DEBUG("LOGGER: Got %d bytes from bipbuffer\n", size);
/* parse buffer */
while (pos < size && watcher_count > 0) {
enum logger_parse_entry_ret ret;
int scratch_len = 0;
e = (logentry *) (data + pos);
ret = logger_thread_parse_entry(e, ls, scratch, &scratch_len);
if (ret != LOGGER_PARSE_ENTRY_OK) {
/* TODO: stats counter */
fprintf(stderr, "LOGGER: Failed to parse log entry\n");
} else {
logger_thread_write_entry(e, ls, scratch, scratch_len);
}
pos += sizeof(logentry) + e->size + e->pad;
}
assert(pos <= size);
pthread_mutex_lock(&l->mutex);
data = bipbuf_poll(l->buf, size);
ls->worker_written += l->written;
ls->worker_dropped += l->dropped;
l->written = 0;
l->dropped = 0;
pthread_mutex_unlock(&l->mutex);
if (data == NULL) {
fprintf(stderr, "LOGGER: unexpectedly couldn't advance buf pointer\n");
assert(0);
}
return size; /* maybe the count of objects iterated? */
}
/* Since the event loop code isn't reusable without a refactor, and we have a
* limited number of potential watchers, we run our own poll loop.
* This calls poll() unnecessarily during write flushes, should be possible to
* micro-optimize later.
*
* This flushes buffers attached to watchers, iterating through the bytes set
* to each worker. Also checks for readability in case client connection was
* closed.
*
* Allows a specific watcher to be flushed (if buf full)
*/
static int logger_thread_poll_watchers(int force_poll, int watcher) {
int x;
int nfd = 0;
unsigned char *data;
unsigned int data_size = 0;
int flushed = 0;
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL || (watcher != WATCHER_ALL && x != watcher))
continue;
data = bipbuf_peek_all(w->buf, &data_size);
if (data != NULL) {
watchers_pollfds[nfd].fd = w->sfd;
watchers_pollfds[nfd].events = POLLOUT;
nfd++;
} else if (force_poll) {
watchers_pollfds[nfd].fd = w->sfd;
watchers_pollfds[nfd].events = POLLIN;
nfd++;
}
/* This gets set after a call to poll, and should be used to gate on
* calling poll again.
*/
w->failed_flush = false;
}
if (nfd == 0)
return 0;
//L_DEBUG("LOGGER: calling poll() [data_size: %d]\n", data_size);
int ret = poll(watchers_pollfds, nfd, 0);
if (ret < 0) {
perror("something failed with logger thread watcher fd polling");
return -1;
}
nfd = 0;
for (x = 0; x < WATCHER_LIMIT; x++) {
logger_watcher *w = watchers[x];
if (w == NULL || (watcher != WATCHER_ALL && x != watcher))
continue;
data_size = 0;
/* Early detection of a disconnect. Otherwise we have to wait until
* the next write
*/
if (watchers_pollfds[nfd].revents & POLLIN) {
char buf[1];
int res = ((conn*)w->c)->read(w->c, buf, 1);
if (res == 0 || (res == -1 && (errno != EAGAIN && errno != EWOULDBLOCK))) {
L_DEBUG("LOGGER: watcher closed remotely\n");
logger_thread_close_watcher(w);
nfd++;
continue;
}
}
if ((data = bipbuf_peek_all(w->buf, &data_size)) != NULL) {
if (watchers_pollfds[nfd].revents & (POLLHUP|POLLERR)) {
L_DEBUG("LOGGER: watcher closed during poll() call\n");
logger_thread_close_watcher(w);
} else if (watchers_pollfds[nfd].revents & POLLOUT) {
int total = 0;
/* We can write a bit. */
switch (w->t) {
case LOGGER_WATCHER_STDERR:
total = fwrite(data, 1, data_size, stderr);
break;
case LOGGER_WATCHER_CLIENT:
total = ((conn*)w->c)->write(w->c, data, data_size);
break;
}
L_DEBUG("LOGGER: poll() wrote %d to %d (data_size: %d) (bipbuf_used: %d)\n", total, w->sfd,
data_size, bipbuf_used(w->buf));
if (total == -1) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
logger_thread_close_watcher(w);
}
L_DEBUG("LOGGER: watcher hit EAGAIN\n");
} else if (total == 0) {
logger_thread_close_watcher(w);
} else {
bipbuf_poll(w->buf, total);
flushed += total;
}
}
}
nfd++;
}
return flushed;
}
static void logger_thread_flush_stats(struct logger_stats *ls) {
STATS_LOCK();
stats.log_worker_dropped += ls->worker_dropped;
stats.log_worker_written += ls->worker_written;
stats.log_watcher_skipped += ls->watcher_skipped;
stats.log_watcher_sent += ls->watcher_sent;
stats_state.log_watchers = ls->watcher_count;
STATS_UNLOCK();
}
#define MAX_LOGGER_SLEEP 1000000
#define MIN_LOGGER_SLEEP 1000
/* Primary logger thread routine */
static void *logger_thread(void *arg) {
useconds_t to_sleep = MIN_LOGGER_SLEEP;
L_DEBUG("LOGGER: Starting logger thread\n");
// TODO: If we ever have item references in the logger code, will need to
// ensure everything is dequeued before stopping the thread.
while (do_run_logger_thread) {
int found_logs = 0;
logger *l;
struct logger_stats ls;
memset(&ls, 0, sizeof(struct logger_stats));
/* only sleep if we're *above* the minimum */
if (to_sleep > MIN_LOGGER_SLEEP)
usleep(to_sleep);
/* Call function to iterate each logger. */
pthread_mutex_lock(&logger_stack_lock);
if (watcher_count == 0) {
// Not bothering to loop on the condition here since it's fine to
// walk through with zero watchers.
pthread_cond_wait(&logger_stack_cond, &logger_stack_lock);
}
for (l = logger_stack_head; l != NULL; l=l->next) {
/* lock logger, call function to manipulate it */
found_logs += logger_thread_read(l, &ls);
}
logger_thread_poll_watchers(1, WATCHER_ALL);
/* capture the current count within mutual exclusion of the lock */
ls.watcher_count = watcher_count;
pthread_mutex_unlock(&logger_stack_lock);
/* TODO: abstract into a function and share with lru_crawler */
if (!found_logs) {
if (to_sleep < MAX_LOGGER_SLEEP)
to_sleep += to_sleep / 8;
if (to_sleep > MAX_LOGGER_SLEEP)
to_sleep = MAX_LOGGER_SLEEP;
} else {
to_sleep /= 2;
if (to_sleep < MIN_LOGGER_SLEEP)
to_sleep = MIN_LOGGER_SLEEP;
}
logger_thread_flush_stats(&ls);
}
return NULL;
}
static int start_logger_thread(void) {
int ret;
do_run_logger_thread = 1;
if ((ret = pthread_create(&logger_tid, NULL,
logger_thread, NULL)) != 0) {
fprintf(stderr, "Can't start logger thread: %s\n", strerror(ret));
return -1;
}
thread_setname(logger_tid, "mc-log");
return 0;
}
static int stop_logger_thread(void) {
// Guarantees that the logger thread is waiting on 'logger_stack_cond'
// before we signal it.
pthread_mutex_lock(&logger_stack_lock);
do_run_logger_thread = 0;
pthread_cond_signal(&logger_stack_cond);
pthread_mutex_unlock(&logger_stack_lock);
pthread_join(logger_tid, NULL);
return 0;
}
/*************************
* Public functions for submitting logs and starting loggers from workers.
*************************/
/* Global logger thread start/init */
void logger_init(void) {
/* TODO: auto destructor when threads exit */
/* TODO: error handling */
/* init stack for iterating loggers */
logger_stack_head = 0;
logger_stack_tail = 0;
pthread_key_create(&logger_key, NULL);
if (start_logger_thread() != 0) {
abort();
}
/* This is what adding a STDERR watcher looks like. should replace old
* "verbose" settings. */
//logger_add_watcher(NULL, 0);
return;
}
void logger_stop(void) {
stop_logger_thread();
}
/* called *from* the thread using a logger.
* initializes the per-thread bipbuf, links it into the list of loggers
*/
logger *logger_create(void) {
L_DEBUG("LOGGER: Creating and linking new logger instance\n");
logger *l = calloc(1, sizeof(logger));
if (l == NULL) {
return NULL;
}
l->buf = bipbuf_new(settings.logger_buf_size);
if (l->buf == NULL) {
free(l);
return NULL;
}