Allow replacing within and deleting metadata keys.

diff --git a/src/target_replace.c b/src/target_replace.c
index 40a6fec..975acbc 100644 (file)
--- a/src/target_replace.c
+++ b/src/target_replace.c
@@ -43,6 +43,17 @@ struct tr_action_s
   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;
@@ -50,6 +61,7 @@ struct tr_data_s
   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;
 
@@ -85,6 +97,21 @@ 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)
 {
@@ -153,6 +180,108 @@ static int tr_config_add_action (tr_action_t **dest, /* {{{ */
   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, int 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;
+
+  act->key = tr_strdup (ci->values[0].value.string);
+  if (act->key == NULL)
+  {
+    ERROR ("tr_config_add_meta_action: tr_strdup failed.");
+    sfree (act);
+    return (-ENOMEM);
+  }
+
+  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);
+  }
+
+  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.");
+      sfree (act->key);
+      regfree (&act->re);
+      sfree (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)
 {
@@ -215,6 +344,112 @@ static int tr_action_invoke (tr_action_t *act_head, /* {{{ */
   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;
+
+    value_type = meta_data_type (*dest, act->key);
+    if (value_type == 0)  /* not found */
+      continue;
+    if (value_type != MD_TYPE_STRING)
+    {
+      ERROR ("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)
+      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);
+      continue;
+    }
+
+    if (act->replacement != NULL)
+    {
+      meta_data_t *result;
+
+      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 = %zu, end = %zu, "
+            "replacement = %s) failed.",
+            value, (size_t) matches[0].rm_so, (size_t) matches[0].rm_eo,
+            act->replacement);
+        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);
+        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);
+        return (meta_data_status);
+      }
+
+      meta_data_clone_merge (dest, result);
+      meta_data_destroy (result);
+    }
+    else  /* no replacement; delete the key */
+    {
+      DEBUG ("target_replace plugin: tr_meta_data_action_invoke: "
+          "deleting `%s'", act->key);
+      meta_data_delete (*dest, act->key);
+    }
+  } /* 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;
@@ -231,6 +466,7 @@ static int tr_destroy (void **user_data) /* {{{ */
   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);
@@ -253,6 +489,7 @@ 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++)
@@ -277,6 +514,12 @@ 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 "
@@ -295,7 +538,8 @@ static int tr_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
         && (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'.");
@@ -330,13 +574,18 @@ static int tr_invoke (const data_set_t *ds, value_list_t *vl, /* {{{ */
     return (-EINVAL);
   }
 
+  if (data->meta != NULL)
+  {
+    tr_meta_data_action_invoke (data->meta, &(vl->meta));
+  }
+
 #define HANDLE_FIELD(f,e) \
   if (data->f != NULL) \
     tr_action_invoke (data->f, vl->f, sizeof (vl->f), e)
   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);