forked from steveyen/moxi
/
agent_config.c
1138 lines (942 loc) · 33.8 KB
/
agent_config.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sysexits.h>
#include <pthread.h>
#include <assert.h>
#include "memcached.h"
#include "cproxy.h"
#include "work.h"
#include "agent.h"
// Integration with libconflate.
//
static void update_ptd_config(void *data0, void *data1);
static bool update_str_config(char **curr, char *next, char *descrip);
static bool update_behaviors_config(proxy_behavior **curr,
int *curr_num,
proxy_behavior *next,
int next_num,
char *descrip);
char *parse_kvs_servers(char *prefix,
char *pool_name,
kvpair_t *kvs,
char **servers,
proxy_behavior_pool *behavior_pool);
char **parse_kvs_behavior(kvpair_t *kvs,
char *prefix,
char *name,
proxy_behavior *behavior);
static void agent_logger(void *userdata,
enum conflate_log_level lvl,
const char *msg, ...)
{
char *n = NULL;
bool v = false;
switch(lvl) {
case FATAL: n = "FATAL"; v = settings.verbose > 0; break;
case ERROR: n = "ERROR"; v = settings.verbose > 0; break;
case WARN: n = "WARN"; v = settings.verbose > 1; break;
case INFO: n = "INFO"; v = settings.verbose > 1; break;
case DEBUG: n = "DEBUG"; v = settings.verbose > 2; break;
}
if (!v) {
return;
}
char fmt[strlen(msg) + 16];
snprintf(fmt, sizeof(fmt), "%s: %s\n", n, msg);
va_list ap;
va_start(ap, msg);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
static void init_extensions(void)
{
conflate_register_mgmt_cb("client_stats", "Retrieve stats from moxi",
on_conflate_get_stats);
conflate_register_mgmt_cb("reset_stats", "Reset moxi stats",
on_conflate_reset_stats);
conflate_register_mgmt_cb("ping_test", "Perform a ping test",
on_conflate_ping_test);
}
/** The cfg_str looks like...
*
* apikey=jidname@jhostname%jpassword,config=config,host=host
* or...
* jidname@jhostname%jpassword,config=config,host=host
*
* Only the apikey is needed, so it can also look like...
*
* jidname@jhostname%jpassword
*/
int cproxy_init_agent(char *cfg_str,
proxy_behavior behavior,
int nthreads) {
init_extensions();
if (cfg_str == NULL) {
fprintf(stderr, "missing cfg\n");
exit(EXIT_FAILURE);
}
int cfg_len = strlen(cfg_str);
if (cfg_len <= 0) {
fprintf(stderr, "empty cfg\n");
exit(EXIT_FAILURE);
}
char *buff;
if (strncmp(cfg_str, "apikey=", 7) == 0 ||
strncmp(cfg_str, "auth=", 5) == 0 ||
strncmp(cfg_str, "url=", 4) == 0) {
buff = trimstrdup(cfg_str);
} else {
buff = calloc(cfg_len + 50, sizeof(char));
if (buff != NULL) {
snprintf(buff, cfg_len + 50, "apikey=%s", cfg_str);
}
buff = trimstr(buff);
}
char *next = buff;
int rv = 0;
while (next != NULL) {
char *jid = NULL;
char *jpw = NULL;
char *jpwmem = NULL;
char *dbpath = NULL;
char *host = NULL;
char *cur = trimstr(strsep(&next, ";"));
while (cur != NULL) {
char *key_val = trimstr(strsep(&cur, ",\r\n"));
if (key_val != NULL) {
char *key = trimstr(strsep(&key_val, "="));
char *val = trimstr(key_val);
bool handled = true;
if (key != NULL &&
val != NULL) {
if (wordeq(key, "apikey") ||
wordeq(key, "auth")) {
jid = strsep(&val, "%");
jpw = val;
} else if (wordeq(key, "config") ||
wordeq(key, "dbpath")) {
dbpath = val;
} else if (wordeq(key, "host") ||
wordeq(key, "url")) {
host = val;
} else {
handled = false;
}
} else {
handled = false;
}
if (handled == false &&
key != NULL &&
key[0] != '#' &&
key[0] != '\0') {
if (settings.verbose > 0) {
fprintf(stderr,
"unknown configuration key: %s\n", key);
}
}
}
}
if (jid == NULL) {
jid = "";
}
if (jpw == NULL) {
// Handle if jid/jpw is in user:password@fqdn format
// instead of user@fqdn%password format.
//
char *colon = strchr(jid, ':');
char *asign = strchr(jid, '@');
if (colon != NULL &&
asign != NULL &&
asign > colon) {
*asign = '\0';
jpw = jpwmem = strdup(colon + 1);
*asign = '@';
do {
*colon = *asign;
colon++;
asign++;
} while (*asign != '\0');
*colon = '\0';
}
}
if (jpw == NULL) {
jpw = "";
}
int dbpath_alloc = 0;
if (dbpath == NULL) {
dbpath_alloc = strlen(jid) + strlen(CONFLATE_DB_PATH) + 100;
dbpath = calloc(dbpath_alloc, 1);
if (dbpath != NULL) {
snprintf(dbpath, dbpath_alloc,
CONFLATE_DB_PATH "/conflate-%s.cfg",
(jid != NULL && strlen(jid) > 0 ? jid : "default"));
} else {
fprintf(stderr, "conflate dbpath buf alloc\n");
exit(EXIT_FAILURE);
}
}
if (settings.verbose > 1) {
fprintf(stderr, "cproxy_init jid: %s host: %s dbpath: %s\n", jid, host, dbpath);
}
if (cproxy_init_agent_start(jid, jpw, dbpath, host,
behavior,
nthreads) != NULL) {
rv++;
}
if (dbpath_alloc > 0 &&
dbpath != NULL) {
free(dbpath);
}
if (jpwmem) {
free(jpwmem);
}
}
free(buff);
return rv;
}
proxy_main *cproxy_init_agent_start(char *jid,
char *jpw,
char *dbpath,
char *host,
proxy_behavior behavior,
int nthreads) {
assert(dbpath);
if (settings.verbose > 2) {
fprintf(stderr, "cproxy_init_agent_start\n");;
}
proxy_main *m = cproxy_gen_proxy_main(behavior, nthreads,
PROXY_CONF_TYPE_DYNAMIC);
if (m != NULL) {
conflate_config_t config;
memset(&config, 0, sizeof(config));
init_conflate(&config);
// Different jid's possible for production, staging, etc.
config.jid = jid; // "customer@stevenmb.local" or
// "Administrator"
config.pass = jpw; // "password"
config.host = host; // "localhost" or
// "http://x.com:8080"
// "http://x.com:8080/pools/default/buckets/default"
config.software = PACKAGE;
config.version = VERSION;
config.save_path = dbpath;
config.userdata = m;
config.new_config = on_conflate_new_config;
config.log = agent_logger;
if (start_conflate(config)) {
if (settings.verbose > 2) {
fprintf(stderr, "cproxy_init done\n");
}
return m;
}
free(m);
}
if (settings.verbose > 1) {
fprintf(stderr, "cproxy could not start conflate\n");
}
return NULL;
}
static
void cproxy_on_new_config(void *data0, void *data1);
void on_conflate_new_config(void *userdata, kvpair_t *config) {
assert(config != NULL);
proxy_main *m = userdata;
assert(m != NULL);
LIBEVENT_THREAD *mthread = thread_by_index(0);
assert(mthread != NULL);
if (settings.verbose > 2) {
fprintf(stderr, "agent_config ocnc on_conflate_new_config\n");
}
work_collect completion;
work_collect_init(&completion, 1, m);
kvpair_t *copy = dup_kvpair(config);
if (copy != NULL) {
if (!work_send(mthread->work_queue, cproxy_on_new_config, &completion, copy) &&
settings.verbose > 1) {
fprintf(stderr, "work_send failed\n");
}
} else {
if (settings.verbose > 1) {
fprintf(stderr, "agent_config ocnc failed dup_kvpair\n");
}
}
work_collect_wait(&completion);
}
static
void cproxy_on_new_config(void *data0, void *data1) {
work_collect *completion = data0;
proxy_main *m = completion->data;
assert(m);
kvpair_t *kvs = data1;
assert(kvs);
assert(is_listen_thread());
m->stat_configs++;
uint32_t max_config_ver = 0;
for (proxy *p = m->proxy_head; p != NULL; p = p->next) {
pthread_mutex_lock(&p->proxy_lock);
if (max_config_ver < p->config_ver) {
max_config_ver = p->config_ver;
}
pthread_mutex_unlock(&p->proxy_lock);
}
uint32_t new_config_ver = max_config_ver + 1;
if (settings.verbose > 2) {
fprintf(stderr, "conc new_config_ver %u\n", new_config_ver);
}
#ifdef MOXI_USE_VBUCKET
char **contents = get_key_values(kvs, "contents");
if (contents != NULL &&
contents[0] != NULL) {
char *config = trimstrdup(contents[0]);
if (settings.verbose > 2) {
fprintf(stderr, "conc contents config %s\n", config);
}
// The config should be JSON that should look like...
//
// {"name":"default",
// "nodes":[{"hostname":"10.17.1.46","status":"healthy",
// "version":"0.3.0_114_g31859fe","os":"i386-apple-darwin9.8.0",
// "ports":{"proxy":11213,"direct":11212}}],
// "buckets":{"uri":"/pools/default/buckets"},
// "controllers":{"ejectNode":{"uri":"/controller/ejectNode"},
// "testWorkload":{"uri":"/pools/default/controller/testWorkload"}},
// "stats":{"uri":"/pools/default/stats"},
// "vBucketServerMap":{...more json here...}}
//
VBUCKET_CONFIG_HANDLE vch = vbucket_config_parse_string(config);
if (vch) {
if (settings.verbose > 2) {
fprintf(stderr, "conc vbucket_config_parse_string: %d\n", (vch != NULL));
}
proxy_behavior proxyb = m->behavior;
int pool_port = proxyb.port_listen;
int nodes_num = vbucket_config_get_num_servers(vch);
if (settings.verbose > 2) {
fprintf(stderr, "conc pool_port: %d nodes_num: %d\n",
pool_port, nodes_num);
}
if (pool_port > 0 &&
nodes_num > 0) {
proxy_behavior_pool behavior_pool = {
.base = proxyb,
.num = nodes_num,
.arr = calloc(nodes_num, sizeof(proxy_behavior))
};
if (behavior_pool.arr != NULL) {
int j = 0;
for (; j < nodes_num; j++) {
// Inherit default behavior.
//
behavior_pool.arr[j] = behavior_pool.base;
const char *hostport = vbucket_config_get_server(vch, j);
if (hostport != NULL &&
strlen(hostport) > 0 &&
strlen(hostport) < sizeof(behavior_pool.arr[j].host) - 1) {
strncpy(behavior_pool.arr[j].host,
hostport,
sizeof(behavior_pool.arr[j].host) - 1);
char *colon = strchr(behavior_pool.arr[j].host, ':');
if (colon != NULL) {
*colon = '\0';
behavior_pool.arr[j].port = atoi(colon + 1);
if (behavior_pool.arr[j].port <= 0) {
break;
}
} else {
break;
}
} else {
break;
}
}
if (j >= nodes_num) {
cproxy_on_new_pool(m, "default", pool_port,
config, new_config_ver,
&behavior_pool);
} else {
if (settings.verbose > 1) {
fprintf(stderr,
"ERROR: error receiving host:port for server config %d in %s\n",
j, config);
}
}
free(behavior_pool.arr);
}
}
vbucket_config_destroy(vch);
}
free(config);
} else {
goto fail;
}
#else // !MOXI_USE_VBUCKET
// The kvs key-multivalues look roughly like...
//
// pool-customer1-a
// svrname3
// pool-customer1-b
// svrname1
// svrname2
// svr-svrname1
// host=mc1.foo.net
// port=11211
// weight=1
// bucket=buck1
// usr=test1
// pwd=password
// svr-svrnameX
// host=mc2.foo.net
// port=11211
// behavior-customer1-a
// wait_queue_timeout=1000
// downstream_max=10
// behavior-customer1-b
// wait_queue_timeout=1000
// downstream_max=10
// pool_drain-customer1-b
// svrname1
// svrname3
// pools
// customer1-a
// customer1-b
// bindings
// 11221
// 11331
//
char **pools = get_key_values(kvs, "pools");
char **bindings = get_key_values(kvs, "bindings");
if (pools == NULL) {
goto fail;
}
int npools = 0;
int nbindings = 0;
while (pools && pools[npools])
npools++;
while (bindings && bindings[nbindings])
nbindings++;
if (nbindings > 0 &&
nbindings != npools) {
if (settings.verbose > 1) {
fprintf(stderr, "npools does not match nbindings\n");
}
goto fail;
}
char **behavior_kvs = get_key_values(kvs, "behavior");
if (behavior_kvs != NULL) {
// Update the default behavior.
//
proxy_behavior m_behavior = m->behavior;
for (int k = 0; behavior_kvs[k]; k++) {
char *bstr = trimstrdup(behavior_kvs[k]);
if (bstr != NULL) {
cproxy_parse_behavior_key_val_str(bstr, &m_behavior);
free(bstr);
}
}
m->behavior = m_behavior;
}
for (int i = 0; i < npools; i++) {
char *pool_name = skipspace(pools[i]);
if (pool_name != NULL &&
pool_name[0] != '\0') {
char buf[200];
snprintf(buf, sizeof(buf), "pool-%s", pool_name);
char **servers = get_key_values(kvs, trimstr(buf));
if (servers != NULL) {
// Parse proxy-level behavior.
//
proxy_behavior proxyb = m->behavior;
if (parse_kvs_behavior(kvs, "behavior", pool_name, &proxyb)) {
if (settings.verbose > 1) {
cproxy_dump_behavior(&proxyb,
"conc proxy_behavior", 1);
}
}
// The legacy way to get a port is through the bindings,
// but they're also available as an inheritable
// proxy_behavior field of port_listen.
//
int pool_port = proxyb.port_listen;
if (i < nbindings &&
bindings != NULL &&
bindings[i]) {
pool_port = atoi(skipspace(bindings[i]));
}
if (pool_port > 0) {
// Number of servers in this pool.
//
int s = 0;
while (servers[s])
s++;
if (s > 0) {
// Parse server-level behaviors, so we'll have an
// array of behaviors, one entry for each server.
//
proxy_behavior_pool behavior_pool = {
.base = proxyb,
.num = s,
.arr = calloc(s, sizeof(proxy_behavior))
};
if (behavior_pool.arr != NULL) {
char *config_str =
parse_kvs_servers("svr", pool_name, kvs,
servers, &behavior_pool);
if (config_str != NULL &&
config_str[0] != '\0') {
if (settings.verbose > 2) {
fprintf(stderr, "conc config: %s\n",
config_str);
}
cproxy_on_new_pool(m, pool_name, pool_port,
config_str, new_config_ver,
&behavior_pool);
free(config_str);
}
free(behavior_pool.arr);
} else {
if (settings.verbose > 1) {
fprintf(stderr, "ERROR: oom on re-config malloc\n");;
}
goto fail;
}
} else {
// Note: ignore when no servers for an existing pool.
// Because the config_ver won't be updated, we'll
// fall into the empty_pool code path below.
}
} else {
if (settings.verbose > 1) {
fprintf(stderr, "ERROR: conc missing pool port\n");
}
goto fail;
}
} else {
// Note: ignore when no servers for an existing pool.
// Because the config_ver won't be updated, we'll
// fall into the empty_pool code path below.
}
} else {
if (settings.verbose > 1) {
fprintf(stderr, "ERROR: conc missing pool name\n");
}
goto fail;
}
}
#endif // !MOXI_USE_VBUCKET
// If there were any proxies that weren't updated in the
// previous loop, we need to shut them down. We mark the
// proxy->config as NULL, and cproxy_check_downstream_config()
// will catch it.
//
// TODO: Close any listening conns for the proxy?
// TODO: Close any upstream conns for the proxy?
// TODO: We still need to free proxy memory, after all its
// proxy_td's and downstreams are closed, and no more
// upstreams are pointed at the proxy.
//
proxy_behavior_pool empty_pool;
memset(&empty_pool, 0, sizeof(proxy_behavior_pool));
empty_pool.base = m->behavior;
empty_pool.num = 0;
empty_pool.arr = NULL;
for (proxy *p = m->proxy_head; p != NULL; p = p->next) {
bool down = false;
int port = 0;
char *name = NULL;
pthread_mutex_lock(&p->proxy_lock);
if (p->config_ver != new_config_ver) {
down = true;
assert(p->port > 0);
assert(p->name != NULL);
port = p->port;
name = strdup(p->name);
}
pthread_mutex_unlock(&p->proxy_lock);
if (down) {
cproxy_on_new_pool(m, name, port, NULL, new_config_ver,
&empty_pool);
}
if (name != NULL) {
free(name);
}
}
free_kvpair(kvs);
out:
work_collect_one(completion);
return;
fail:
m->stat_config_fails++;
free_kvpair(kvs);
if (settings.verbose > 1) {
fprintf(stderr, "ERROR: conc failed config %llu\n",
(long long unsigned int) m->stat_config_fails);
}
goto out;
}
/**
* A name and port uniquely identify a proxy.
*/
void cproxy_on_new_pool(proxy_main *m,
char *name, int port,
char *config,
uint32_t config_ver,
proxy_behavior_pool *behavior_pool) {
assert(m);
assert(name != NULL);
assert(port >= 0);
assert(is_listen_thread());
// See if we've already got a proxy running with that name and port,
// and create one if needed.
//
bool found = false;
proxy *p = m->proxy_head;
while (p != NULL && !found) {
pthread_mutex_lock(&p->proxy_lock);
assert(p->port > 0);
assert(p->name != NULL);
found = ((p->port == port) &&
(strcmp(p->name, name) == 0));
pthread_mutex_unlock(&p->proxy_lock);
if (found) {
break;
}
p = p->next;
}
if (p == NULL) {
p = cproxy_create(name, port,
config,
config_ver,
behavior_pool,
m->nthreads);
if (p != NULL) {
pthread_mutex_lock(&m->proxy_main_lock);
p->next = m->proxy_head;
m->proxy_head = p;
pthread_mutex_unlock(&m->proxy_main_lock);
int n = cproxy_listen(p);
if (n > 0) {
if (settings.verbose > 2) {
fprintf(stderr,
"cproxy_listen success %u to %s with %d conns\n",
p->port, p->config, n);
}
m->stat_proxy_starts++;
} else {
if (settings.verbose > 1) {
fprintf(stderr,
"ERROR: cproxy_listen failed on %u to %s\n",
p->port, p->config);
}
m->stat_proxy_start_fails++;
}
}
} else {
if (settings.verbose > 2) {
fprintf(stderr, "conp existing config change %u\n",
p->port);
}
bool changed = false;
bool shutdown = false;
pthread_mutex_lock(&m->proxy_main_lock);
// Turn off the front_cache while we're reconfiguring.
//
mcache_stop(&p->front_cache);
matcher_stop(&p->front_cache_matcher);
matcher_stop(&p->front_cache_unmatcher);
matcher_stop(&p->optimize_set_matcher);
pthread_mutex_lock(&p->proxy_lock);
if (settings.verbose > 2) {
if (p->config && config &&
strcmp(p->config, config) != 0) {
fprintf(stderr,
"conp config changed from %s to %s\n",
p->config, config);
}
}
changed =
update_str_config(&p->config, config,
"conp config changed") ||
changed;
changed =
(cproxy_equal_behavior(&p->behavior_pool.base,
&behavior_pool->base) == false) ||
changed;
p->behavior_pool.base = behavior_pool->base;
changed =
update_behaviors_config(&p->behavior_pool.arr,
&p->behavior_pool.num,
behavior_pool->arr,
behavior_pool->num,
"conp behaviors changed") ||
changed;
if (p->config != NULL &&
p->behavior_pool.arr != NULL) {
m->stat_proxy_existings++;
} else {
m->stat_proxy_shutdowns++;
shutdown = true;
}
assert(config_ver != p->config_ver);
p->config_ver = config_ver;
pthread_mutex_unlock(&p->proxy_lock);
if (settings.verbose > 2) {
fprintf(stderr, "conp changed %s, shutdown %s\n",
changed ? "true" : "false",
shutdown ? "true" : "false");
}
// Restart the front_cache, if necessary.
//
if (shutdown == false) {
if (behavior_pool->base.front_cache_max > 0 &&
behavior_pool->base.front_cache_lifespan > 0) {
mcache_start(&p->front_cache,
behavior_pool->base.front_cache_max);
if (strlen(behavior_pool->base.front_cache_spec) > 0) {
matcher_start(&p->front_cache_matcher,
behavior_pool->base.front_cache_spec);
}
if (strlen(behavior_pool->base.front_cache_unspec) > 0) {
matcher_start(&p->front_cache_unmatcher,
behavior_pool->base.front_cache_unspec);
}
}
if (strlen(behavior_pool->base.optimize_set) > 0) {
matcher_start(&p->optimize_set_matcher,
behavior_pool->base.optimize_set);
}
}
// Send update across worker threads, avoiding locks.
//
work_collect wc = {0};
work_collect_init(&wc, m->nthreads - 1, NULL);
for (int i = 1; i < m->nthreads; i++) {
LIBEVENT_THREAD *t = thread_by_index(i);
assert(t);
assert(t->work_queue);
proxy_td *ptd = &p->thread_data[i];
if (t &&
t->work_queue) {
work_send(t->work_queue, update_ptd_config, ptd, &wc);
}
}
pthread_mutex_unlock(&m->proxy_main_lock);
work_collect_wait(&wc);
}
}
// ----------------------------------------------------------
static void update_ptd_config(void *data0, void *data1) {
proxy_td *ptd = data0;
assert(ptd);
proxy *p = ptd->proxy;
assert(p);
work_collect *c = data1;
assert(c);
assert(is_listen_thread() == false); // Expecting a worker thread.
pthread_mutex_lock(&p->proxy_lock);
bool changed = false;
int port = p->port;
int prev = ptd->config_ver;
if (ptd->config_ver != p->config_ver) {
ptd->config_ver = p->config_ver;
changed =
update_str_config(&ptd->config, p->config, NULL) ||
changed;
ptd->behavior_pool.base = p->behavior_pool.base;
changed =
update_behaviors_config(&ptd->behavior_pool.arr,
&ptd->behavior_pool.num,
p->behavior_pool.arr,
p->behavior_pool.num,
NULL) ||
changed;
}
pthread_mutex_unlock(&p->proxy_lock);
// Restart the key_stats, if necessary.
//
if (changed) {
mcache_stop(&ptd->key_stats);
matcher_stop(&ptd->key_stats_matcher);
matcher_stop(&ptd->key_stats_unmatcher);
if (ptd->config != NULL) {
if (ptd->behavior_pool.base.key_stats_max > 0 &&
ptd->behavior_pool.base.key_stats_lifespan > 0) {
mcache_start(&ptd->key_stats,
ptd->behavior_pool.base.key_stats_max);
if (strlen(ptd->behavior_pool.base.key_stats_spec) > 0) {
matcher_start(&ptd->key_stats_matcher,
ptd->behavior_pool.base.key_stats_spec);
}
if (strlen(ptd->behavior_pool.base.key_stats_unspec) > 0) {
matcher_start(&ptd->key_stats_unmatcher,
ptd->behavior_pool.base.key_stats_unspec);
}
}
}
if (settings.verbose > 2) {
fprintf(stderr, "update_ptd_config %u, %u to %u\n",
port, prev, ptd->config_ver);
}
} else {
if (settings.verbose > 2) {
fprintf(stderr, "update_ptd_config %u, %u = %u no change\n",
port, prev, ptd->config_ver);
}
}
work_collect_one(c);
}
// ----------------------------------------------------------
static bool update_str_config(char **curr, char *next, char *descrip) {
bool rv = false;
if ((*curr != NULL) &&
(next == NULL ||
strcmp(*curr, next) != 0)) {
free(*curr);
*curr = NULL;
rv = true;
if (descrip != NULL &&
settings.verbose > 2) {
fprintf(stderr, "%s\n", descrip);
}
}
if (*curr == NULL && next != NULL) {
*curr = trimstrdup(next);
}
return rv;
}
static bool update_behaviors_config(proxy_behavior **curr,
int *curr_num,
proxy_behavior *next,
int next_num,
char *descrip) {
bool rv = false;
if ((*curr != NULL) &&
(next == NULL ||
cproxy_equal_behaviors(*curr_num,
*curr,
next_num,
next) == false)) {
free(*curr);
*curr = NULL;
*curr_num = 0;
rv = true;
if (descrip != NULL &&
settings.verbose > 2) {
fprintf(stderr, "%s\n", descrip);