X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=src%2Ftarget_replace.c;h=54d41647cc08d6a01bbbd58ec28da514a86d6ae3;hp=382fc3575de6b0aca4c7b3926366dea0cbae832c;hb=7b8851b26928b609ce850e78c1eabb50ff319244;hpb=2079ee1517e34de372f58e7e2267ad5c71a8a41f

diff --git a/src/target_replace.c b/src/target_replace.c
index 382fc357..54d41647 100644
--- a/src/target_replace.c
+++ b/src/target_replace.c
@@ -37,17 +37,28 @@ typedef struct tr_action_s tr_action_t;
 struct tr_action_s {
   regex_t re;
   char *replacement;
-  int may_be_empty;
+  _Bool may_be_empty;
 
   tr_action_t *next;
 };
 
+struct tr_meta_data_action_s;
+typedef struct tr_meta_data_action_s tr_meta_data_action_t;
+struct tr_meta_data_action_s {
+  char *key;
+  regex_t re;
+  char *replacement;
+
+  tr_meta_data_action_t *next;
+};
+
 struct tr_data_s {
   tr_action_t *host;
   tr_action_t *plugin;
   tr_action_t *plugin_instance;
   /* tr_action_t *type; */
   tr_action_t *type_instance;
+  tr_meta_data_action_t *meta;
 };
 typedef struct tr_data_s tr_data_t;
 
@@ -57,16 +68,16 @@ static char *tr_strdup(const char *orig) /* {{{ */
   char *dest;
 
   if (orig == NULL)
-    return (NULL);
+    return NULL;
 
   sz = strlen(orig) + 1;
   dest = malloc(sz);
   if (dest == NULL)
-    return (NULL);
+    return NULL;
 
   memcpy(dest, orig, sz);
 
-  return (dest);
+  return dest;
 } /* }}} char *tr_strdup */
 
 static void tr_action_destroy(tr_action_t *act) /* {{{ */
@@ -83,26 +94,41 @@ static void tr_action_destroy(tr_action_t *act) /* {{{ */
   sfree(act);
 } /* }}} void tr_action_destroy */
 
+static void tr_meta_data_action_destroy(tr_meta_data_action_t *act) /* {{{ */
+{
+  if (act == NULL)
+    return;
+
+  sfree(act->key);
+  regfree(&act->re);
+  sfree(act->replacement);
+
+  if (act->next != NULL)
+    tr_meta_data_action_destroy(act->next);
+
+  sfree(act);
+} /* }}} void tr_meta_data_action_destroy */
+
 static int tr_config_add_action(tr_action_t **dest, /* {{{ */
-                                const oconfig_item_t *ci, int may_be_empty) {
+                                const oconfig_item_t *ci, _Bool may_be_empty) {
   tr_action_t *act;
   int status;
 
   if (dest == NULL)
-    return (-EINVAL);
+    return -EINVAL;
 
   if ((ci->values_num != 2) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
       (ci->values[1].type != OCONFIG_TYPE_STRING)) {
     ERROR("Target `replace': The `%s' option requires exactly two string "
           "arguments.",
           ci->key);
-    return (-1);
+    return -1;
   }
 
   act = calloc(1, sizeof(*act));
   if (act == NULL) {
     ERROR("tr_config_add_action: calloc failed.");
-    return (-ENOMEM);
+    return -ENOMEM;
   }
 
   act->replacement = NULL;
@@ -118,15 +144,14 @@ static int tr_config_add_action(tr_action_t **dest, /* {{{ */
           "failed: %s.",
           ci->values[0].value.string, errbuf);
     sfree(act);
-    return (-EINVAL);
+    return -EINVAL;
   }
 
   act->replacement = tr_strdup(ci->values[1].value.string);
   if (act->replacement == NULL) {
     ERROR("tr_config_add_action: tr_strdup failed.");
-    regfree(&act->re);
-    sfree(act);
-    return (-ENOMEM);
+    tr_action_destroy(act);
+    return -ENOMEM;
   }
 
   /* Insert action at end of list. */
@@ -142,18 +167,108 @@ static int tr_config_add_action(tr_action_t **dest, /* {{{ */
     prev->next = act;
   }
 
-  return (0);
+  return 0;
 } /* }}} int tr_config_add_action */
 
+static int tr_config_add_meta_action(tr_meta_data_action_t **dest, /* {{{ */
+                                     const oconfig_item_t *ci,
+                                     _Bool should_delete) {
+  tr_meta_data_action_t *act;
+  int status;
+
+  if (dest == NULL)
+    return -EINVAL;
+
+  if (should_delete) {
+    if ((ci->values_num != 2) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
+        (ci->values[1].type != OCONFIG_TYPE_STRING)) {
+      ERROR("Target `replace': The `%s' option requires exactly two string "
+            "arguments.",
+            ci->key);
+      return -1;
+    }
+  } else {
+    if ((ci->values_num != 3) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
+        (ci->values[1].type != OCONFIG_TYPE_STRING) ||
+        (ci->values[2].type != OCONFIG_TYPE_STRING)) {
+      ERROR("Target `replace': The `%s' option requires exactly three string "
+            "arguments.",
+            ci->key);
+      return -1;
+    }
+  }
+
+  if (strlen(ci->values[0].value.string) == 0) {
+    ERROR("Target `replace': The `%s' option does not accept empty string as "
+          "first argument.",
+          ci->key);
+    return -1;
+  }
+
+  act = calloc(1, sizeof(*act));
+  if (act == NULL) {
+    ERROR("tr_config_add_meta_action: calloc failed.");
+    return -ENOMEM;
+  }
+
+  act->key = NULL;
+  act->replacement = NULL;
+
+  status = regcomp(&act->re, ci->values[1].value.string, REG_EXTENDED);
+  if (status != 0) {
+    char errbuf[1024] = "";
+
+    /* regerror assures null termination. */
+    regerror(status, &act->re, errbuf, sizeof(errbuf));
+    ERROR("Target `replace': Compiling the regular expression `%s' "
+          "failed: %s.",
+          ci->values[1].value.string, errbuf);
+    sfree(act->key);
+    sfree(act);
+    return -EINVAL;
+  }
+
+  act->key = tr_strdup(ci->values[0].value.string);
+  if (act->key == NULL) {
+    ERROR("tr_config_add_meta_action: tr_strdup failed.");
+    tr_meta_data_action_destroy(act);
+    return -ENOMEM;
+  }
+
+  if (!should_delete) {
+    act->replacement = tr_strdup(ci->values[2].value.string);
+    if (act->replacement == NULL) {
+      ERROR("tr_config_add_meta_action: tr_strdup failed.");
+      tr_meta_data_action_destroy(act);
+      return -ENOMEM;
+    }
+  }
+
+  /* Insert action at end of list. */
+  if (*dest == NULL)
+    *dest = act;
+  else {
+    tr_meta_data_action_t *prev;
+
+    prev = *dest;
+    while (prev->next != NULL)
+      prev = prev->next;
+
+    prev->next = act;
+  }
+
+  return 0;
+} /* }}} int tr_config_add_meta_action */
+
 static int tr_action_invoke(tr_action_t *act_head, /* {{{ */
                             char *buffer_in, size_t buffer_in_size,
-                            int may_be_empty) {
+                            _Bool may_be_empty) {
   int status;
   char buffer[DATA_MAX_NAME_LEN];
   regmatch_t matches[8] = {[0] = {0}};
 
   if (act_head == NULL)
-    return (-EINVAL);
+    return -EINVAL;
 
   sstrncpy(buffer, buffer_in, sizeof(buffer));
 
@@ -179,7 +294,8 @@ static int tr_action_invoke(tr_action_t *act_head, /* {{{ */
     subst_status = subst(temp, sizeof(temp), buffer, (size_t)matches[0].rm_so,
                          (size_t)matches[0].rm_eo, act->replacement);
     if (subst_status == NULL) {
-      ERROR("Target `replace': subst (buffer = %s, start = %zu, end = %zu, "
+      ERROR("Target `replace': subst (buffer = %s, start = %" PRIsz
+            ", end = %" PRIsz ", "
             "replacement = %s) failed.",
             buffer, (size_t)matches[0].rm_so, (size_t)matches[0].rm_eo,
             act->replacement);
@@ -193,34 +309,140 @@ static int tr_action_invoke(tr_action_t *act_head, /* {{{ */
   if ((may_be_empty == 0) && (buffer[0] == 0)) {
     WARNING("Target `replace': Replacement resulted in an empty string, "
             "which is not allowed for this buffer (`host' or `plugin').");
-    return (0);
+    return 0;
   }
 
   DEBUG("target_replace plugin: tr_action_invoke: -> buffer = %s;", buffer);
   sstrncpy(buffer_in, buffer, buffer_in_size);
 
-  return (0);
+  return 0;
 } /* }}} int tr_action_invoke */
 
+static int tr_meta_data_action_invoke(/* {{{ */
+                                      tr_meta_data_action_t *act_head,
+                                      meta_data_t **dest) {
+  int status;
+  regmatch_t matches[8] = {[0] = {0}};
+
+  if (act_head == NULL)
+    return -EINVAL;
+
+  if ((*dest) == NULL) /* nothing to do */
+    return 0;
+
+  for (tr_meta_data_action_t *act = act_head; act != NULL; act = act->next) {
+    char temp[DATA_MAX_NAME_LEN];
+    char *subst_status;
+    int value_type;
+    int meta_data_status;
+    char *value;
+    meta_data_t *result;
+
+    value_type = meta_data_type(*dest, act->key);
+    if (value_type == 0) /* not found */
+      continue;
+    if (value_type != MD_TYPE_STRING) {
+      WARNING("Target `replace': Attempting replace on metadata key `%s', "
+              "which isn't a string.",
+              act->key);
+      continue;
+    }
+
+    meta_data_status = meta_data_get_string(*dest, act->key, &value);
+    if (meta_data_status != 0) {
+      ERROR("Target `replace': Unable to retrieve metadata value for `%s'.",
+            act->key);
+      return meta_data_status;
+    }
+
+    DEBUG("target_replace plugin: tr_meta_data_action_invoke: `%s' "
+          "old value = `%s'",
+          act->key, value);
+
+    status = regexec(&act->re, value, STATIC_ARRAY_SIZE(matches), matches,
+                     /* flags = */ 0);
+    if (status == REG_NOMATCH) {
+      sfree(value);
+      continue;
+    } else if (status != 0) {
+      char errbuf[1024] = "";
+
+      regerror(status, &act->re, errbuf, sizeof(errbuf));
+      ERROR("Target `replace': Executing a regular expression failed: %s.",
+            errbuf);
+      sfree(value);
+      continue;
+    }
+
+    if (act->replacement == NULL) {
+      /* no replacement; delete the key */
+      DEBUG("target_replace plugin: tr_meta_data_action_invoke: "
+            "deleting `%s'",
+            act->key);
+      meta_data_delete(*dest, act->key);
+      sfree(value);
+      continue;
+    }
+
+    subst_status = subst(temp, sizeof(temp), value, (size_t)matches[0].rm_so,
+                         (size_t)matches[0].rm_eo, act->replacement);
+    if (subst_status == NULL) {
+      ERROR("Target `replace': subst (value = %s, start = %" PRIsz
+            ", end = %" PRIsz ", "
+            "replacement = %s) failed.",
+            value, (size_t)matches[0].rm_so, (size_t)matches[0].rm_eo,
+            act->replacement);
+      sfree(value);
+      continue;
+    }
+
+    DEBUG("target_replace plugin: tr_meta_data_action_invoke: `%s' "
+          "value `%s' -> `%s'",
+          act->key, value, temp);
+
+    if ((result = meta_data_create()) == NULL) {
+      ERROR("Target `replace': failed to create metadata for `%s'.", act->key);
+      sfree(value);
+      return -ENOMEM;
+    }
+
+    meta_data_status = meta_data_add_string(result, act->key, temp);
+    if (meta_data_status != 0) {
+      ERROR("Target `replace': Unable to set metadata value for `%s'.",
+            act->key);
+      meta_data_destroy(result);
+      sfree(value);
+      return meta_data_status;
+    }
+
+    meta_data_clone_merge(dest, result);
+    meta_data_destroy(result);
+    sfree(value);
+  } /* for (act = act_head; act != NULL; act = act->next) */
+
+  return 0;
+} /* }}} int tr_meta_data_action_invoke */
+
 static int tr_destroy(void **user_data) /* {{{ */
 {
   tr_data_t *data;
 
   if (user_data == NULL)
-    return (-EINVAL);
+    return -EINVAL;
 
   data = *user_data;
   if (data == NULL)
-    return (0);
+    return 0;
 
   tr_action_destroy(data->host);
   tr_action_destroy(data->plugin);
   tr_action_destroy(data->plugin_instance);
   /* tr_action_destroy (data->type); */
   tr_action_destroy(data->type_instance);
+  tr_meta_data_action_destroy(data->meta);
   sfree(data);
 
-  return (0);
+  return 0;
 } /* }}} int tr_destroy */
 
 static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
@@ -231,7 +453,7 @@ static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
   data = calloc(1, sizeof(*data));
   if (data == NULL) {
     ERROR("tr_create: calloc failed.");
-    return (-ENOMEM);
+    return -ENOMEM;
   }
 
   data->host = NULL;
@@ -239,6 +461,7 @@ static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
   data->plugin_instance = NULL;
   /* data->type = NULL; */
   data->type_instance = NULL;
+  data->meta = NULL;
 
   status = 0;
   for (int i = 0; i < ci->children_num; i++) {
@@ -262,6 +485,12 @@ static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
     else if (strcasecmp("TypeInstance", child->key) == 0)
       status = tr_config_add_action(&data->type_instance, child,
                                     /* may be empty = */ 1);
+    else if (strcasecmp("MetaData", child->key) == 0)
+      status = tr_config_add_meta_action(&data->meta, child,
+                                         /* should delete = */ 0);
+    else if (strcasecmp("DeleteMetaData", child->key) == 0)
+      status = tr_config_add_meta_action(&data->meta, child,
+                                         /* should delete = */ 1);
     else {
       ERROR("Target `replace': The `%s' configuration option is not understood "
             "and will be ignored.",
@@ -278,7 +507,7 @@ static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
     if ((data->host == NULL) && (data->plugin == NULL) &&
         (data->plugin_instance == NULL)
         /* && (data->type == NULL) */
-        && (data->type_instance == NULL)) {
+        && (data->type_instance == NULL) && (data->meta == NULL)) {
       ERROR("Target `replace': You need to set at least one of `Host', "
             "`Plugin', `PluginInstance' or `TypeInstance'.");
       status = -1;
@@ -289,11 +518,11 @@ static int tr_create(const oconfig_item_t *ci, void **user_data) /* {{{ */
 
   if (status != 0) {
     tr_destroy((void *)&data);
-    return (status);
+    return status;
   }
 
   *user_data = data;
-  return (0);
+  return 0;
 } /* }}} int tr_create */
 
 static int tr_invoke(const data_set_t *ds, value_list_t *vl, /* {{{ */
@@ -302,12 +531,16 @@ static int tr_invoke(const data_set_t *ds, value_list_t *vl, /* {{{ */
   tr_data_t *data;
 
   if ((ds == NULL) || (vl == NULL) || (user_data == NULL))
-    return (-EINVAL);
+    return -EINVAL;
 
   data = *user_data;
   if (data == NULL) {
     ERROR("Target `replace': Invoke: `data' is NULL.");
-    return (-EINVAL);
+    return -EINVAL;
+  }
+
+  if (data->meta != NULL) {
+    tr_meta_data_action_invoke(data->meta, &(vl->meta));
   }
 
 #define HANDLE_FIELD(f, e)                                                     \
@@ -316,10 +549,10 @@ static int tr_invoke(const data_set_t *ds, value_list_t *vl, /* {{{ */
   HANDLE_FIELD(host, 0);
   HANDLE_FIELD(plugin, 0);
   HANDLE_FIELD(plugin_instance, 1);
-  /* HANDLE_FIELD (type); */
+  /* HANDLE_FIELD (type, 0); */
   HANDLE_FIELD(type_instance, 1);
 
-  return (FC_TARGET_CONTINUE);
+  return FC_TARGET_CONTINUE;
 } /* }}} int tr_invoke */
 
 void module_register(void) {
@@ -330,5 +563,3 @@ void module_register(void) {
   tproc.invoke = tr_invoke;
   fc_register_target("replace", tproc);
 } /* module_register */
-
-/* vim: set sw=2 sts=2 tw=78 et fdm=marker : */