X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=src%2Fwrite_tsdb.c;h=5c43eda3d2eb9de2b69d2027a54cf01b94f55e8c;hp=b670f3ae583d3d401565c019ed5df900667f87b8;hb=7111bb6df7628edce3a8e538b386fbe27633a191;hpb=4979d8dcd6f097eb8fd4661086e28accd31ff905

diff --git a/src/write_tsdb.c b/src/write_tsdb.c
index b670f3ae..5c43eda3 100644
--- a/src/write_tsdb.c
+++ b/src/write_tsdb.c
@@ -45,606 +45,606 @@
 
 #include "common.h"
 #include "plugin.h"
-
 #include "utils_cache.h"
+#include "utils_random.h"
 
 #include <netdb.h>
 
 #ifndef WT_DEFAULT_NODE
-# define WT_DEFAULT_NODE "localhost"
+#define WT_DEFAULT_NODE "localhost"
 #endif
 
 #ifndef WT_DEFAULT_SERVICE
-# define WT_DEFAULT_SERVICE "4242"
+#define WT_DEFAULT_SERVICE "4242"
 #endif
 
 #ifndef WT_DEFAULT_ESCAPE
-# define WT_DEFAULT_ESCAPE '.'
+#define WT_DEFAULT_ESCAPE '.'
 #endif
 
 /* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
 #ifndef WT_SEND_BUF_SIZE
-# define WT_SEND_BUF_SIZE 1428
+#define WT_SEND_BUF_SIZE 1428
 #endif
 
 /*
  * Private variables
  */
-struct wt_callback
-{
-    int      sock_fd;
+struct wt_callback {
+  struct addrinfo *ai;
+  cdtime_t ai_last_update;
+  int sock_fd;
+
+  char *node;
+  char *service;
+  char *host_tags;
 
-    char     *node;
-    char     *service;
-    char     *host_tags;
+  _Bool store_rates;
+  _Bool always_append_ds;
 
-    _Bool    store_rates;
-    _Bool    always_append_ds;
+  char send_buf[WT_SEND_BUF_SIZE];
+  size_t send_buf_free;
+  size_t send_buf_fill;
+  cdtime_t send_buf_init_time;
 
-    char     send_buf[WT_SEND_BUF_SIZE];
-    size_t   send_buf_free;
-    size_t   send_buf_fill;
-    cdtime_t send_buf_init_time;
+  pthread_mutex_t send_lock;
 
-    pthread_mutex_t send_lock;
+  _Bool connect_failed_log_enabled;
+  int connect_dns_failed_attempts_remaining;
+  cdtime_t next_random_ttl;
 };
 
+static cdtime_t resolve_interval = 0;
+static cdtime_t resolve_jitter = 0;
 
 /*
  * Functions
  */
-static void wt_reset_buffer(struct wt_callback *cb)
-{
-    memset(cb->send_buf, 0, sizeof(cb->send_buf));
-    cb->send_buf_free = sizeof(cb->send_buf);
-    cb->send_buf_fill = 0;
-    cb->send_buf_init_time = cdtime();
+static void wt_reset_buffer(struct wt_callback *cb) {
+  memset(cb->send_buf, 0, sizeof(cb->send_buf));
+  cb->send_buf_free = sizeof(cb->send_buf);
+  cb->send_buf_fill = 0;
+  cb->send_buf_init_time = cdtime();
 }
 
-static int wt_send_buffer(struct wt_callback *cb)
-{
-    ssize_t status = 0;
+static int wt_send_buffer(struct wt_callback *cb) {
+  ssize_t status = 0;
 
-    status = swrite(cb->sock_fd, cb->send_buf, strlen(cb->send_buf));
-    if (status < 0)
-    {
-        char errbuf[1024];
-        ERROR("write_tsdb plugin: send failed with status %zi (%s)",
-              status, sstrerror (errno, errbuf, sizeof (errbuf)));
+  status = swrite(cb->sock_fd, cb->send_buf, strlen(cb->send_buf));
+  if (status != 0) {
+    char errbuf[1024];
+    ERROR("write_tsdb plugin: send failed with status %zi (%s)", status,
+          sstrerror(errno, errbuf, sizeof(errbuf)));
 
-        close (cb->sock_fd);
-        cb->sock_fd = -1;
+    close(cb->sock_fd);
+    cb->sock_fd = -1;
 
-        return -1;
-    }
+    return -1;
+  }
 
-    return 0;
+  return 0;
 }
 
 /* NOTE: You must hold cb->send_lock when calling this function! */
-static int wt_flush_nolock(cdtime_t timeout, struct wt_callback *cb)
-{
-    int status;
-
-    DEBUG("write_tsdb plugin: wt_flush_nolock: timeout = %.3f; "
-          "send_buf_fill = %zu;",
-          (double)timeout,
-          cb->send_buf_fill);
-
-    /* timeout == 0  => flush unconditionally */
-    if (timeout > 0)
-    {
-        cdtime_t now;
-
-        now = cdtime();
-        if ((cb->send_buf_init_time + timeout) > now)
-            return 0;
-    }
+static int wt_flush_nolock(cdtime_t timeout, struct wt_callback *cb) {
+  int status;
 
-    if (cb->send_buf_fill == 0)
-    {
-        cb->send_buf_init_time = cdtime();
-        return 0;
-    }
+  DEBUG("write_tsdb plugin: wt_flush_nolock: timeout = %.3f; "
+        "send_buf_fill = %zu;",
+        (double)timeout, cb->send_buf_fill);
+
+  /* timeout == 0  => flush unconditionally */
+  if (timeout > 0) {
+    cdtime_t now;
+
+    now = cdtime();
+    if ((cb->send_buf_init_time + timeout) > now)
+      return 0;
+  }
+
+  if (cb->send_buf_fill == 0) {
+    cb->send_buf_init_time = cdtime();
+    return 0;
+  }
 
-    status = wt_send_buffer(cb);
-    wt_reset_buffer(cb);
+  status = wt_send_buffer(cb);
+  wt_reset_buffer(cb);
 
-    return status;
+  return status;
 }
 
-static int wt_callback_init(struct wt_callback *cb)
-{
-    struct addrinfo *ai_list;
-    int status;
+static cdtime_t new_random_ttl() {
+  if (resolve_jitter == 0)
+    return 0;
 
-    const char *node = cb->node ? cb->node : WT_DEFAULT_NODE;
-    const char *service = cb->service ? cb->service : WT_DEFAULT_SERVICE;
+  return (cdtime_t)cdrand_range(0, (long)resolve_jitter);
+}
 
-    if (cb->sock_fd > 0)
-        return 0;
+static int wt_callback_init(struct wt_callback *cb) {
+  int status;
+  cdtime_t now;
+
+  const char *node = cb->node ? cb->node : WT_DEFAULT_NODE;
+  const char *service = cb->service ? cb->service : WT_DEFAULT_SERVICE;
+
+  if (cb->sock_fd > 0)
+    return 0;
+
+  now = cdtime();
+  if (cb->ai) {
+    /* When we are here, we still have the IP in cache.
+     * If we have remaining attempts without calling the DNS, we update the
+     * last_update date so we keep the info until next time.
+     * If there is no more attempts, we need to flush the cache.
+     */
+
+    if ((cb->ai_last_update + resolve_interval + cb->next_random_ttl) < now) {
+      cb->next_random_ttl = new_random_ttl();
+      if (cb->connect_dns_failed_attempts_remaining > 0) {
+        /* Warning : this is run under send_lock mutex.
+         * This is why we do not use another mutex here.
+         * */
+        cb->ai_last_update = now;
+        cb->connect_dns_failed_attempts_remaining--;
+      } else {
+        freeaddrinfo(cb->ai);
+        cb->ai = NULL;
+      }
+    }
+  }
+
+  if (cb->ai == NULL) {
+    if ((cb->ai_last_update + resolve_interval + cb->next_random_ttl) >= now) {
+      DEBUG("write_tsdb plugin: too many getaddrinfo(%s, %s) failures", node,
+            service);
+      return -1;
+    }
+    cb->ai_last_update = now;
+    cb->next_random_ttl = new_random_ttl();
 
     struct addrinfo ai_hints = {
         .ai_family = AF_UNSPEC,
         .ai_flags = AI_ADDRCONFIG,
-        .ai_socktype = SOCK_STREAM
+        .ai_socktype = SOCK_STREAM,
     };
 
-    status = getaddrinfo(node, service, &ai_hints, &ai_list);
-    if (status != 0)
-    {
-        ERROR("write_tsdb plugin: getaddrinfo (%s, %s) failed: %s",
-              node, service, gai_strerror (status));
-        return -1;
+    status = getaddrinfo(node, service, &ai_hints, &cb->ai);
+    if (status != 0) {
+      if (cb->ai) {
+        freeaddrinfo(cb->ai);
+        cb->ai = NULL;
+      }
+      if (cb->connect_failed_log_enabled) {
+        ERROR("write_tsdb plugin: getaddrinfo(%s, %s) failed: %s", node,
+              service, gai_strerror(status));
+        cb->connect_failed_log_enabled = 0;
+      }
+      return -1;
     }
+  }
 
-    assert (ai_list != NULL);
-    for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
-    {
-        cb->sock_fd = socket(ai_ptr->ai_family, ai_ptr->ai_socktype,
-                             ai_ptr->ai_protocol);
-        if (cb->sock_fd < 0)
-            continue;
-
-        set_sock_opts(cb->sock_fd);
-
-        status = connect(cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
-        if (status != 0)
-        {
-            close(cb->sock_fd);
-            cb->sock_fd = -1;
-            continue;
-        }
-
-        break;
-    }
+  assert(cb->ai != NULL);
+  for (struct addrinfo *ai = cb->ai; ai != NULL; ai = ai->ai_next) {
+    cb->sock_fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+    if (cb->sock_fd < 0)
+      continue;
 
-    freeaddrinfo(ai_list);
+    set_sock_opts(cb->sock_fd);
 
-    if (cb->sock_fd < 0)
-    {
-        char errbuf[1024];
-        ERROR("write_tsdb plugin: Connecting to %s:%s failed. "
-              "The last error was: %s", node, service,
-              sstrerror (errno, errbuf, sizeof(errbuf)));
-        return -1;
+    status = connect(cb->sock_fd, ai->ai_addr, ai->ai_addrlen);
+    if (status != 0) {
+      close(cb->sock_fd);
+      cb->sock_fd = -1;
+      continue;
     }
 
-    wt_reset_buffer(cb);
+    break;
+  }
 
-    return 0;
+  if (cb->sock_fd < 0) {
+    char errbuf[1024];
+    ERROR("write_tsdb plugin: Connecting to %s:%s failed. "
+          "The last error was: %s",
+          node, service, sstrerror(errno, errbuf, sizeof(errbuf)));
+    return -1;
+  }
+
+  if (0 == cb->connect_failed_log_enabled) {
+    WARNING("write_tsdb plugin: Connecting to %s:%s succeeded.", node, service);
+    cb->connect_failed_log_enabled = 1;
+  }
+  cb->connect_dns_failed_attempts_remaining = 1;
+
+  wt_reset_buffer(cb);
+
+  return 0;
 }
 
-static void wt_callback_free(void *data)
-{
-    struct wt_callback *cb;
+static void wt_callback_free(void *data) {
+  struct wt_callback *cb;
 
-    if (data == NULL)
-        return;
+  if (data == NULL)
+    return;
 
-    cb = data;
+  cb = data;
 
-    pthread_mutex_lock(&cb->send_lock);
+  pthread_mutex_lock(&cb->send_lock);
 
-    wt_flush_nolock(0, cb);
+  wt_flush_nolock(0, cb);
 
-    close(cb->sock_fd);
-    cb->sock_fd = -1;
+  close(cb->sock_fd);
+  cb->sock_fd = -1;
 
-    sfree(cb->node);
-    sfree(cb->service);
-    sfree(cb->host_tags);
+  sfree(cb->node);
+  sfree(cb->service);
+  sfree(cb->host_tags);
 
-    pthread_mutex_destroy(&cb->send_lock);
+  pthread_mutex_unlock(&cb->send_lock);
+  pthread_mutex_destroy(&cb->send_lock);
 
-    sfree(cb);
+  sfree(cb);
 }
 
 static int wt_flush(cdtime_t timeout,
                     const char *identifier __attribute__((unused)),
-                    user_data_t *user_data)
-{
-    struct wt_callback *cb;
-    int status;
+                    user_data_t *user_data) {
+  struct wt_callback *cb;
+  int status;
 
-    if (user_data == NULL)
-        return -EINVAL;
+  if (user_data == NULL)
+    return -EINVAL;
 
-    cb = user_data->data;
+  cb = user_data->data;
 
-    pthread_mutex_lock(&cb->send_lock);
+  pthread_mutex_lock(&cb->send_lock);
 
-    if (cb->sock_fd < 0)
-    {
-        status = wt_callback_init(cb);
-        if (status != 0)
-        {
-            ERROR("write_tsdb plugin: wt_callback_init failed.");
-            pthread_mutex_unlock(&cb->send_lock);
-            return -1;
-        }
+  if (cb->sock_fd < 0) {
+    status = wt_callback_init(cb);
+    if (status != 0) {
+      ERROR("write_tsdb plugin: wt_callback_init failed.");
+      pthread_mutex_unlock(&cb->send_lock);
+      return -1;
     }
+  }
 
-    status = wt_flush_nolock(timeout, cb);
-    pthread_mutex_unlock(&cb->send_lock);
+  status = wt_flush_nolock(timeout, cb);
+  pthread_mutex_unlock(&cb->send_lock);
 
-    return status;
+  return status;
 }
 
-static int wt_format_values(char *ret, size_t ret_len,
-                            int ds_num, const data_set_t *ds,
-                            const value_list_t *vl,
-                            _Bool store_rates)
-{
-    size_t offset = 0;
-    int status;
-    gauge_t *rates = NULL;
-
-    assert(0 == strcmp (ds->type, vl->type));
-
-    memset(ret, 0, ret_len);
-
-#define BUFFER_ADD(...) do { \
-        status = ssnprintf (ret + offset, ret_len - offset, \
-                            __VA_ARGS__); \
-        if (status < 1) \
-        { \
-            sfree(rates); \
-            return -1; \
-        } \
-        else if (((size_t) status) >= (ret_len - offset)) \
-        { \
-            sfree(rates); \
-            return -1; \
-        } \
-        else \
-            offset += ((size_t) status); \
-} while (0)
-
-    if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
-        BUFFER_ADD(GAUGE_FORMAT, vl->values[ds_num].gauge);
-    else if (store_rates)
-    {
-        if (rates == NULL)
-            rates = uc_get_rate (ds, vl);
-        if (rates == NULL)
-        {
-            WARNING("format_values: "
-                    "uc_get_rate failed.");
-            return -1;
-        }
-        BUFFER_ADD(GAUGE_FORMAT, rates[ds_num]);
-    }
-    else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
-        BUFFER_ADD("%llu", vl->values[ds_num].counter);
-    else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
-        BUFFER_ADD("%" PRIi64, vl->values[ds_num].derive);
-    else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
-        BUFFER_ADD("%" PRIu64, vl->values[ds_num].absolute);
-    else
-    {
-        ERROR("format_values plugin: Unknown data source type: %i",
-              ds->ds[ds_num].type);
-        sfree(rates);
-        return -1;
+static int wt_format_values(char *ret, size_t ret_len, int ds_num,
+                            const data_set_t *ds, const value_list_t *vl,
+                            _Bool store_rates) {
+  size_t offset = 0;
+  int status;
+  gauge_t *rates = NULL;
+
+  assert(0 == strcmp(ds->type, vl->type));
+
+  memset(ret, 0, ret_len);
+
+#define BUFFER_ADD(...)                                                        \
+  do {                                                                         \
+    status = snprintf(ret + offset, ret_len - offset, __VA_ARGS__);            \
+    if (status < 1) {                                                          \
+      sfree(rates);                                                            \
+      return -1;                                                               \
+    } else if (((size_t)status) >= (ret_len - offset)) {                       \
+      sfree(rates);                                                            \
+      return -1;                                                               \
+    } else                                                                     \
+      offset += ((size_t)status);                                              \
+  } while (0)
+
+  if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
+    BUFFER_ADD(GAUGE_FORMAT, vl->values[ds_num].gauge);
+  else if (store_rates) {
+    if (rates == NULL)
+      rates = uc_get_rate(ds, vl);
+    if (rates == NULL) {
+      WARNING("format_values: "
+              "uc_get_rate failed.");
+      return -1;
     }
+    BUFFER_ADD(GAUGE_FORMAT, rates[ds_num]);
+  } else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
+    BUFFER_ADD("%llu", vl->values[ds_num].counter);
+  else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
+    BUFFER_ADD("%" PRIi64, vl->values[ds_num].derive);
+  else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
+    BUFFER_ADD("%" PRIu64, vl->values[ds_num].absolute);
+  else {
+    ERROR("format_values plugin: Unknown data source type: %i",
+          ds->ds[ds_num].type);
+    sfree(rates);
+    return -1;
+  }
 
 #undef BUFFER_ADD
 
-    sfree(rates);
-    return 0;
+  sfree(rates);
+  return 0;
 }
 
-static int wt_format_name(char *ret, int ret_len,
-                          const value_list_t *vl,
-                          const struct wt_callback *cb,
-                          const char *ds_name)
-{
-    int status;
-    char *temp = NULL;
-    const char *prefix = "";
-    const char *meta_prefix = "tsdb_prefix";
-
-    if (vl->meta) {
-        status = meta_data_get_string(vl->meta, meta_prefix, &temp);
-        if (status == -ENOENT) {
-            /* defaults to empty string */
-        } else if (status < 0) {
-            sfree(temp);
-            return status;
-        } else {
-            prefix = temp;
-        }
+static int wt_format_name(char *ret, int ret_len, const value_list_t *vl,
+                          const struct wt_callback *cb, const char *ds_name) {
+  int status;
+  char *temp = NULL;
+  const char *prefix = "";
+  const char *meta_prefix = "tsdb_prefix";
+
+  if (vl->meta) {
+    status = meta_data_get_string(vl->meta, meta_prefix, &temp);
+    if (status == -ENOENT) {
+      /* defaults to empty string */
+    } else if (status < 0) {
+      sfree(temp);
+      return status;
+    } else {
+      prefix = temp;
     }
-
-    if (ds_name != NULL) {
-        if (vl->plugin_instance[0] == '\0') {
-            if (vl->type_instance[0] == '\0') {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
-                        vl->type, ds_name);
-            } else {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
-                        vl->type, vl->type_instance, ds_name);
-            }
-        } else { /* vl->plugin_instance != "" */
-            if (vl->type_instance[0] == '\0') {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
-                        vl->plugin_instance, vl->type, ds_name);
-            } else {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s.%s.%s", prefix,
-                        vl->plugin, vl->plugin_instance, vl->type,
-                        vl->type_instance, ds_name);
-            }
-        }
-    } else { /* ds_name == NULL */
-        if (vl->plugin_instance[0] == '\0') {
-            if (vl->type_instance[0] == '\0') {
-                ssnprintf(ret, ret_len, "%s%s.%s", prefix, vl->plugin,
-                        vl->type);
-            } else {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
-                        vl->type_instance, vl->type);
-            }
-        } else { /* vl->plugin_instance != "" */
-            if (vl->type_instance[0] == '\0') {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
-                        vl->plugin_instance, vl->type);
-            } else {
-                ssnprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
-                        vl->plugin_instance, vl->type, vl->type_instance);
-            }
-        }
+  }
+
+  if (ds_name != NULL) {
+    if (vl->plugin_instance[0] == '\0') {
+      if (vl->type_instance[0] == '\0') {
+        snprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin, vl->type,
+                 ds_name);
+      } else {
+        snprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin, vl->type,
+                 vl->type_instance, ds_name);
+      }
+    } else { /* vl->plugin_instance != "" */
+      if (vl->type_instance[0] == '\0') {
+        snprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
+                 vl->plugin_instance, vl->type, ds_name);
+      } else {
+        snprintf(ret, ret_len, "%s%s.%s.%s.%s.%s", prefix, vl->plugin,
+                 vl->plugin_instance, vl->type, vl->type_instance, ds_name);
+      }
+    }
+  } else { /* ds_name == NULL */
+    if (vl->plugin_instance[0] == '\0') {
+      if (vl->type_instance[0] == '\0') {
+        snprintf(ret, ret_len, "%s%s.%s", prefix, vl->plugin, vl->type);
+      } else {
+        snprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
+                 vl->type_instance, vl->type);
+      }
+    } else { /* vl->plugin_instance != "" */
+      if (vl->type_instance[0] == '\0') {
+        snprintf(ret, ret_len, "%s%s.%s.%s", prefix, vl->plugin,
+                 vl->plugin_instance, vl->type);
+      } else {
+        snprintf(ret, ret_len, "%s%s.%s.%s.%s", prefix, vl->plugin,
+                 vl->plugin_instance, vl->type, vl->type_instance);
+      }
     }
+  }
 
-    sfree(temp);
-    return 0;
+  sfree(temp);
+  return 0;
 }
 
-static int wt_send_message (const char* key, const char* value,
-                            cdtime_t time, struct wt_callback *cb,
-                            const char* host, meta_data_t *md)
-{
-    int status;
-    size_t message_len;
-    char *temp = NULL;
-    const char *tags = "";
-    char message[1024];
-    const char *host_tags = cb->host_tags ? cb->host_tags : "";
-    const char *meta_tsdb = "tsdb_tags";
-
-    /* skip if value is NaN */
-    if (value[0] == 'n')
-        return 0;
-
-    if (md) {
-        status = meta_data_get_string(md, meta_tsdb, &temp);
-        if (status == -ENOENT) {
-            /* defaults to empty string */
-        } else if (status < 0) {
-            ERROR("write_tsdb plugin: tags metadata get failure");
-            sfree(temp);
-            pthread_mutex_unlock(&cb->send_lock);
-            return status;
-        } else {
-            tags = temp;
-        }
-    }
+static int wt_send_message(const char *key, const char *value, cdtime_t time,
+                           struct wt_callback *cb, const char *host,
+                           meta_data_t *md) {
+  int status;
+  size_t message_len;
+  char *temp = NULL;
+  const char *tags = "";
+  char message[1024];
+  const char *host_tags = cb->host_tags ? cb->host_tags : "";
+  const char *meta_tsdb = "tsdb_tags";
+
+  /* skip if value is NaN */
+  if (value[0] == 'n')
+    return 0;
 
-    status = ssnprintf (message,
-                             sizeof(message),
-                             "put %s %.0f %s fqdn=%s %s %s\r\n",
-                             key,
-                             CDTIME_T_TO_DOUBLE(time),
-                             value,
-                             host,
-                             tags,
-                             host_tags);
-    sfree(temp);
-    if (status < 0)
-        return -1;
-    message_len = (size_t) status;
-
-    if (message_len >= sizeof(message)) {
-        ERROR("write_tsdb plugin: message buffer too small: "
-              "Need %zu bytes.", message_len + 1);
-        return -1;
+  if (md) {
+    status = meta_data_get_string(md, meta_tsdb, &temp);
+    if (status == -ENOENT) {
+      /* defaults to empty string */
+    } else if (status < 0) {
+      ERROR("write_tsdb plugin: tags metadata get failure");
+      sfree(temp);
+      pthread_mutex_unlock(&cb->send_lock);
+      return status;
+    } else {
+      tags = temp;
     }
-
-    pthread_mutex_lock(&cb->send_lock);
-
-    if (cb->sock_fd < 0)
-    {
-        status = wt_callback_init(cb);
-        if (status != 0)
-        {
-            ERROR("write_tsdb plugin: wt_callback_init failed.");
-            pthread_mutex_unlock(&cb->send_lock);
-            return -1;
-        }
+  }
+
+  status =
+      snprintf(message, sizeof(message), "put %s %.0f %s fqdn=%s %s %s\r\n",
+               key, CDTIME_T_TO_DOUBLE(time), value, host, tags, host_tags);
+  sfree(temp);
+  if (status < 0)
+    return -1;
+  message_len = (size_t)status;
+
+  if (message_len >= sizeof(message)) {
+    ERROR("write_tsdb plugin: message buffer too small: "
+          "Need %zu bytes.",
+          message_len + 1);
+    return -1;
+  }
+
+  pthread_mutex_lock(&cb->send_lock);
+
+  if (cb->sock_fd < 0) {
+    status = wt_callback_init(cb);
+    if (status != 0) {
+      ERROR("write_tsdb plugin: wt_callback_init failed.");
+      pthread_mutex_unlock(&cb->send_lock);
+      return -1;
     }
+  }
 
-    if (message_len >= cb->send_buf_free)
-    {
-        status = wt_flush_nolock(0, cb);
-        if (status != 0)
-        {
-            pthread_mutex_unlock(&cb->send_lock);
-            return status;
-        }
+  if (message_len >= cb->send_buf_free) {
+    status = wt_flush_nolock(0, cb);
+    if (status != 0) {
+      pthread_mutex_unlock(&cb->send_lock);
+      return status;
     }
+  }
 
-    /* Assert that we have enough space for this message. */
-    assert(message_len < cb->send_buf_free);
+  /* Assert that we have enough space for this message. */
+  assert(message_len < cb->send_buf_free);
 
-    /* `message_len + 1' because `message_len' does not include the
-     * trailing null byte. Neither does `send_buffer_fill'. */
-    memcpy(cb->send_buf + cb->send_buf_fill,
-            message, message_len + 1);
-    cb->send_buf_fill += message_len;
-    cb->send_buf_free -= message_len;
+  /* `message_len + 1' because `message_len' does not include the
+   * trailing null byte. Neither does `send_buffer_fill'. */
+  memcpy(cb->send_buf + cb->send_buf_fill, message, message_len + 1);
+  cb->send_buf_fill += message_len;
+  cb->send_buf_free -= message_len;
 
-    DEBUG("write_tsdb plugin: [%s]:%s buf %zu/%zu (%.1f %%) \"%s\"",
-          cb->node,
-          cb->service,
-          cb->send_buf_fill, sizeof(cb->send_buf),
-          100.0 * ((double) cb->send_buf_fill) /
-          ((double) sizeof(cb->send_buf)),
-          message);
+  DEBUG("write_tsdb plugin: [%s]:%s buf %zu/%zu (%.1f %%) \"%s\"", cb->node,
+        cb->service, cb->send_buf_fill, sizeof(cb->send_buf),
+        100.0 * ((double)cb->send_buf_fill) / ((double)sizeof(cb->send_buf)),
+        message);
 
-    pthread_mutex_unlock(&cb->send_lock);
+  pthread_mutex_unlock(&cb->send_lock);
 
-    return 0;
+  return 0;
 }
 
 static int wt_write_messages(const data_set_t *ds, const value_list_t *vl,
-                             struct wt_callback *cb)
-{
-    char key[10*DATA_MAX_NAME_LEN];
-    char values[512];
-
-    int status;
-
-    if (0 != strcmp(ds->type, vl->type))
-    {
-        ERROR("write_tsdb plugin: DS type does not match "
-              "value list type");
-        return -1;
+                             struct wt_callback *cb) {
+  char key[10 * DATA_MAX_NAME_LEN];
+  char values[512];
+
+  int status;
+
+  if (0 != strcmp(ds->type, vl->type)) {
+    ERROR("write_tsdb plugin: DS type does not match "
+          "value list type");
+    return -1;
+  }
+
+  for (size_t i = 0; i < ds->ds_num; i++) {
+    const char *ds_name = NULL;
+
+    if (cb->always_append_ds || (ds->ds_num > 1))
+      ds_name = ds->ds[i].name;
+
+    /* Copy the identifier to 'key' and escape it. */
+    status = wt_format_name(key, sizeof(key), vl, cb, ds_name);
+    if (status != 0) {
+      ERROR("write_tsdb plugin: error with format_name");
+      return status;
     }
 
-    for (size_t i = 0; i < ds->ds_num; i++)
-    {
-        const char *ds_name = NULL;
-
-        if (cb->always_append_ds || (ds->ds_num > 1))
-            ds_name = ds->ds[i].name;
-
-        /* Copy the identifier to 'key' and escape it. */
-        status = wt_format_name(key, sizeof(key), vl, cb, ds_name);
-        if (status != 0)
-        {
-            ERROR("write_tsdb plugin: error with format_name");
-            return status;
-        }
-
-        escape_string(key, sizeof(key));
-        /* Convert the values to an ASCII representation and put that into
-         * 'values'. */
-        status = wt_format_values(values, sizeof(values), i, ds, vl,
-                                  cb->store_rates);
-        if (status != 0)
-        {
-            ERROR("write_tsdb plugin: error with "
-                  "wt_format_values");
-            return status;
-        }
-
-        /* Send the message to tsdb */
-        status = wt_send_message(key, values, vl->time, cb, vl->host, vl->meta);
-        if (status != 0)
-        {
-            ERROR("write_tsdb plugin: error with "
-                  "wt_send_message");
-            return status;
-        }
+    escape_string(key, sizeof(key));
+    /* Convert the values to an ASCII representation and put that into
+     * 'values'. */
+    status =
+        wt_format_values(values, sizeof(values), i, ds, vl, cb->store_rates);
+    if (status != 0) {
+      ERROR("write_tsdb plugin: error with "
+            "wt_format_values");
+      return status;
     }
 
-    return 0;
+    /* Send the message to tsdb */
+    status = wt_send_message(key, values, vl->time, cb, vl->host, vl->meta);
+    if (status != 0) {
+      ERROR("write_tsdb plugin: error with "
+            "wt_send_message");
+      return status;
+    }
+  }
+
+  return 0;
 }
 
 static int wt_write(const data_set_t *ds, const value_list_t *vl,
-                    user_data_t *user_data)
-{
-    struct wt_callback *cb;
-    int status;
+                    user_data_t *user_data) {
+  struct wt_callback *cb;
+  int status;
 
-    if (user_data == NULL)
-        return EINVAL;
+  if (user_data == NULL)
+    return EINVAL;
 
-    cb = user_data->data;
+  cb = user_data->data;
 
-    status = wt_write_messages(ds, vl, cb);
+  status = wt_write_messages(ds, vl, cb);
 
-    return status;
+  return status;
 }
 
-static int wt_config_tsd(oconfig_item_t *ci)
-{
-    struct wt_callback *cb;
-    char callback_name[DATA_MAX_NAME_LEN];
-
-    cb = calloc(1, sizeof(*cb));
-    if (cb == NULL)
-    {
-        ERROR("write_tsdb plugin: calloc failed.");
-        return -1;
-    }
-    cb->sock_fd = -1;
-    cb->node = NULL;
-    cb->service = NULL;
-    cb->host_tags = NULL;
-    cb->store_rates = 0;
-
-    pthread_mutex_init (&cb->send_lock, NULL);
-
-    for (int i = 0; i < ci->children_num; i++)
-    {
-        oconfig_item_t *child = ci->children + i;
-
-        if (strcasecmp("Host", child->key) == 0)
-            cf_util_get_string(child, &cb->node);
-        else if (strcasecmp("Port", child->key) == 0)
-            cf_util_get_service(child, &cb->service);
-        else if (strcasecmp("HostTags", child->key) == 0)
-            cf_util_get_string(child, &cb->host_tags);
-        else if (strcasecmp("StoreRates", child->key) == 0)
-            cf_util_get_boolean(child, &cb->store_rates);
-        else if (strcasecmp("AlwaysAppendDS", child->key) == 0)
-            cf_util_get_boolean(child, &cb->always_append_ds);
-        else
-        {
-            ERROR("write_tsdb plugin: Invalid configuration "
-                  "option: %s.", child->key);
-        }
+static int wt_config_tsd(oconfig_item_t *ci) {
+  struct wt_callback *cb;
+  char callback_name[DATA_MAX_NAME_LEN];
+
+  cb = calloc(1, sizeof(*cb));
+  if (cb == NULL) {
+    ERROR("write_tsdb plugin: calloc failed.");
+    return -1;
+  }
+  cb->sock_fd = -1;
+  cb->connect_failed_log_enabled = 1;
+  cb->next_random_ttl = new_random_ttl();
+
+  pthread_mutex_init(&cb->send_lock, NULL);
+
+  for (int i = 0; i < ci->children_num; i++) {
+    oconfig_item_t *child = ci->children + i;
+
+    if (strcasecmp("Host", child->key) == 0)
+      cf_util_get_string(child, &cb->node);
+    else if (strcasecmp("Port", child->key) == 0)
+      cf_util_get_service(child, &cb->service);
+    else if (strcasecmp("HostTags", child->key) == 0)
+      cf_util_get_string(child, &cb->host_tags);
+    else if (strcasecmp("StoreRates", child->key) == 0)
+      cf_util_get_boolean(child, &cb->store_rates);
+    else if (strcasecmp("AlwaysAppendDS", child->key) == 0)
+      cf_util_get_boolean(child, &cb->always_append_ds);
+    else {
+      ERROR("write_tsdb plugin: Invalid configuration "
+            "option: %s.",
+            child->key);
     }
+  }
 
-    ssnprintf(callback_name, sizeof(callback_name), "write_tsdb/%s/%s",
-              cb->node != NULL ? cb->node : WT_DEFAULT_NODE,
-              cb->service != NULL ? cb->service : WT_DEFAULT_SERVICE);
+  snprintf(callback_name, sizeof(callback_name), "write_tsdb/%s/%s",
+           cb->node != NULL ? cb->node : WT_DEFAULT_NODE,
+           cb->service != NULL ? cb->service : WT_DEFAULT_SERVICE);
 
-    user_data_t user_data = {
-        .data = cb,
-        .free_func = wt_callback_free
-    };
+  user_data_t user_data = {.data = cb, .free_func = wt_callback_free};
 
-    plugin_register_write(callback_name, wt_write, &user_data);
+  plugin_register_write(callback_name, wt_write, &user_data);
 
-    user_data.free_func = NULL;
-    plugin_register_flush(callback_name, wt_flush, &user_data);
+  user_data.free_func = NULL;
+  plugin_register_flush(callback_name, wt_flush, &user_data);
 
-    return 0;
+  return 0;
 }
 
-static int wt_config(oconfig_item_t *ci)
-{
-    for (int i = 0; i < ci->children_num; i++)
-    {
-        oconfig_item_t *child = ci->children + i;
-
-        if (strcasecmp("Node", child->key) == 0)
-            wt_config_tsd(child);
-        else
-        {
-            ERROR("write_tsdb plugin: Invalid configuration "
-                  "option: %s.", child->key);
-        }
+static int wt_config(oconfig_item_t *ci) {
+  if ((resolve_interval == 0) && (resolve_jitter == 0))
+    resolve_interval = resolve_jitter = plugin_get_interval();
+
+  for (int i = 0; i < ci->children_num; i++) {
+    oconfig_item_t *child = ci->children + i;
+
+    if (strcasecmp("Node", child->key) == 0)
+      wt_config_tsd(child);
+    else if (strcasecmp("ResolveInterval", child->key) == 0)
+      cf_util_get_cdtime(child, &resolve_interval);
+    else if (strcasecmp("ResolveJitter", child->key) == 0)
+      cf_util_get_cdtime(child, &resolve_jitter);
+    else {
+      ERROR("write_tsdb plugin: Invalid configuration "
+            "option: %s.",
+            child->key);
     }
+  }
 
-    return 0;
+  return 0;
 }
 
-void module_register(void)
-{
-    plugin_register_complex_config("write_tsdb", wt_config);
+void module_register(void) {
+  plugin_register_complex_config("write_tsdb", wt_config);
 }
-
-/* vim: set sw=4 ts=4 sts=4 tw=78 et : */