diff options
Diffstat (limited to 'libnetdata/config')
| -rw-r--r-- | libnetdata/config/Makefile.am | 8 | ||||
| -rw-r--r-- | libnetdata/config/README.md | 54 | ||||
| -rw-r--r-- | libnetdata/config/appconfig.c | 883 | ||||
| -rw-r--r-- | libnetdata/config/appconfig.h | 209 |
4 files changed, 1154 insertions, 0 deletions
diff --git a/libnetdata/config/Makefile.am b/libnetdata/config/Makefile.am new file mode 100644 index 0000000..161784b --- /dev/null +++ b/libnetdata/config/Makefile.am @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-3.0-or-later + +AUTOMAKE_OPTIONS = subdir-objects +MAINTAINERCLEANFILES = $(srcdir)/Makefile.in + +dist_noinst_DATA = \ + README.md \ + $(NULL) diff --git a/libnetdata/config/README.md b/libnetdata/config/README.md new file mode 100644 index 0000000..a71f1ee --- /dev/null +++ b/libnetdata/config/README.md @@ -0,0 +1,54 @@ +<!-- +title: "Netdata ini config files" +custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/config/README.md +--> + +# Netdata ini config files + +Configuration files `netdata.conf` and `stream.conf` are Netdata ini files. + +## Motivation + +The whole idea came up when we were evaluating the documentation involved +in maintaining a complex configuration system. Our intention was to give +configuration options for everything imaginable. But then, documenting all +these options would require a tremendous amount of time, users would have +to search through endless pages for the option they need, etc. + +We concluded then that **configuring software like that is a waste of time +and effort**. Of course there must be plenty of configuration options, but +the implementation itself should require a lot less effort for both the +developers and the users. + +So, we did this: + +1. No configuration is required to run Netdata +2. There are plenty of options to tweak +3. There is minimal documentation (or no at all) + +## Why this works? + +The configuration file is a `name = value` dictionary with `[sections]`. +Write whatever you like there as long as it follows this simple format. + +Netdata loads this dictionary and then when the code needs a value from +it, it just looks up the `name` in the dictionary at the proper `section`. +In all places, in the code, there are both the `names` and their +`default values`, so if something is not found in the configuration +file, the default is used. The lookup is made using B-Trees and hashes +(no string comparisons), so they are super fast. Also the `names` of the +settings can be `my super duper setting that once set to yes, will turn the world upside down = no` + +- so goodbye to most of the documentation involved. + +Next, Netdata can generate a valid configuration for the user to edit. +No need to remember anything or copy and paste settings. Just get the +configuration from the server (`/netdata.conf` on your Netdata server), +edit it and save it. + +Last, what about options you believe you have set, but you misspelled? +When you get the configuration file from the server, there will be a +comment above all `name = value` pairs the server does not use. +So you know that whatever you wrote there, is not used. + +[](<>) diff --git a/libnetdata/config/appconfig.c b/libnetdata/config/appconfig.c new file mode 100644 index 0000000..d9dcde7 --- /dev/null +++ b/libnetdata/config/appconfig.c @@ -0,0 +1,883 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "../libnetdata.h" + +/* + * @Input: + * Connector / instance to add to an internal structure + * @Return + * The current head of the linked list of connector_instance + * + */ + +_CONNECTOR_INSTANCE *add_connector_instance(struct section *connector, struct section *instance) +{ + static struct _connector_instance *global_connector_instance = NULL; + struct _connector_instance *local_ci, *local_ci_tmp; + + if (unlikely(!connector)) { + if (unlikely(!instance)) + return global_connector_instance; + + local_ci = global_connector_instance; + while (local_ci) { + local_ci_tmp = local_ci->next; + freez(local_ci); + local_ci = local_ci_tmp; + } + global_connector_instance = NULL; + return NULL; + } + + local_ci = callocz(1, sizeof(struct _connector_instance)); + local_ci->instance = instance; + local_ci->connector = connector; + strncpy(local_ci->instance_name, instance->name, CONFIG_MAX_NAME); + strncpy(local_ci->connector_name, connector->name, CONFIG_MAX_NAME); + local_ci->next = global_connector_instance; + global_connector_instance = local_ci; + + return global_connector_instance; +} + +int is_valid_connector(char *type, int check_reserved) +{ + int rc = 1; + + if (unlikely(!type)) + return 0; + + if (!check_reserved) { + if (unlikely(is_valid_connector(type,1))) { + return 0; + } + //if (unlikely(*type == ':') + // return 0; + char *separator = strrchr(type, ':'); + if (likely(separator)) { + *separator = '\0'; + rc = separator - type; + } else + return 0; + } +// else { +// if (unlikely(is_valid_connector(type,1))) { +// error("Section %s invalid -- reserved name", type); +// return 0; +// } +// } + + if (!strcmp(type, "graphite") || !strcmp(type, "graphite:plaintext")) { + return rc; + } else if (!strcmp(type, "graphite:http") || !strcmp(type, "graphite:https")) { + return rc; + } else if (!strcmp(type, "json") || !strcmp(type, "json:plaintext")) { + return rc; + } else if (!strcmp(type, "json:http") || !strcmp(type, "json:https")) { + return rc; + } else if (!strcmp(type, "opentsdb") || !strcmp(type, "opentsdb:telnet")) { + return rc; + } else if (!strcmp(type, "opentsdb:http") || !strcmp(type, "opentsdb:https")) { + return rc; + } else if (!strcmp(type, "prometheus_remote_write")) { + return rc; + } else if (!strcmp(type, "prometheus_remote_write:http") || !strcmp(type, "prometheus_remote_write:https")) { + return rc; + } else if (!strcmp(type, "kinesis") || !strcmp(type, "kinesis:plaintext")) { + return rc; + } else if (!strcmp(type, "pubsub") || !strcmp(type, "pubsub:plaintext")) { + return rc; + } else if (!strcmp(type, "mongodb") || !strcmp(type, "mongodb:plaintext")) { + return rc; + } + + return 0; +} + +// ---------------------------------------------------------------------------- +// locking + +inline void appconfig_wrlock(struct config *root) { + netdata_mutex_lock(&root->mutex); +} + +inline void appconfig_unlock(struct config *root) { + netdata_mutex_unlock(&root->mutex); +} + +inline void config_section_wrlock(struct section *co) { + netdata_mutex_lock(&co->mutex); +} + +inline void config_section_unlock(struct section *co) { + netdata_mutex_unlock(&co->mutex); +} + + +// ---------------------------------------------------------------------------- +// config name-value index + +static int appconfig_option_compare(void *a, void *b) { + if(((struct config_option *)a)->hash < ((struct config_option *)b)->hash) return -1; + else if(((struct config_option *)a)->hash > ((struct config_option *)b)->hash) return 1; + else return strcmp(((struct config_option *)a)->name, ((struct config_option *)b)->name); +} + +#define appconfig_option_index_add(co, cv) (struct config_option *)avl_insert_lock(&((co)->values_index), (avl *)(cv)) +#define appconfig_option_index_del(co, cv) (struct config_option *)avl_remove_lock(&((co)->values_index), (avl *)(cv)) + +static struct config_option *appconfig_option_index_find(struct section *co, const char *name, uint32_t hash) { + struct config_option tmp; + tmp.hash = (hash)?hash:simple_hash(name); + tmp.name = (char *)name; + + return (struct config_option *)avl_search_lock(&(co->values_index), (avl *) &tmp); +} + + +// ---------------------------------------------------------------------------- +// config sections index + +int appconfig_section_compare(void *a, void *b) { + if(((struct section *)a)->hash < ((struct section *)b)->hash) return -1; + else if(((struct section *)a)->hash > ((struct section *)b)->hash) return 1; + else return strcmp(((struct section *)a)->name, ((struct section *)b)->name); +} + +#define appconfig_index_add(root, cfg) (struct section *)avl_insert_lock(&(root)->index, (avl *)(cfg)) +#define appconfig_index_del(root, cfg) (struct section *)avl_remove_lock(&(root)->index, (avl *)(cfg)) + +static struct section *appconfig_index_find(struct config *root, const char *name, uint32_t hash) { + struct section tmp; + tmp.hash = (hash)?hash:simple_hash(name); + tmp.name = (char *)name; + + return (struct section *)avl_search_lock(&root->index, (avl *) &tmp); +} + + +// ---------------------------------------------------------------------------- +// config section methods + +static inline struct section *appconfig_section_find(struct config *root, const char *section) { + return appconfig_index_find(root, section, 0); +} + +static inline struct section *appconfig_section_create(struct config *root, const char *section) { + debug(D_CONFIG, "Creating section '%s'.", section); + + struct section *co = callocz(1, sizeof(struct section)); + co->name = strdupz(section); + co->hash = simple_hash(co->name); + netdata_mutex_init(&co->mutex); + + avl_init_lock(&co->values_index, appconfig_option_compare); + + if(unlikely(appconfig_index_add(root, co) != co)) + error("INTERNAL ERROR: indexing of section '%s', already exists.", co->name); + + appconfig_wrlock(root); + struct section *co2 = root->last_section; + if(co2) { + co2->next = co; + } else { + root->first_section = co; + } + root->last_section = co; + appconfig_unlock(root); + + return co; +} + +void appconfig_section_destroy_non_loaded(struct config *root, const char *section) +{ + struct section *co; + struct config_option *cv, *cv_next; + + debug(D_CONFIG, "Destroying section '%s'.", section); + + co = appconfig_section_find(root, section); + if(!co) { + error("Could not destroy section '%s'. Not found.", section); + return; + } + + config_section_wrlock(co); + for(cv = co->values; cv ; cv = cv->next) { + if (cv->flags & CONFIG_VALUE_LOADED) { + /* Do not destroy values that were loaded from the configuration files. */ + config_section_unlock(co); + return; + } + } + for(cv = co->values ; cv ; cv = cv_next) { + cv_next = cv->next; + if(unlikely(!appconfig_option_index_del(co, cv))) + error("Cannot remove config option '%s' from section '%s'.", cv->name, co->name); + freez(cv->value); + freez(cv->name); + freez(cv); + } + co->values = NULL; + config_section_unlock(co); + + if (unlikely(!appconfig_index_del(root, co))) { + error("Cannot remove section '%s' from config.", section); + return; + } + + avl_destroy_lock(&co->values_index); + freez(co->name); + pthread_mutex_destroy(&co->mutex); + freez(co); +} + + +// ---------------------------------------------------------------------------- +// config name-value methods + +static inline struct config_option *appconfig_value_create(struct section *co, const char *name, const char *value) { + debug(D_CONFIG, "Creating config entry for name '%s', value '%s', in section '%s'.", name, value, co->name); + + struct config_option *cv = callocz(1, sizeof(struct config_option)); + cv->name = strdupz(name); + cv->hash = simple_hash(cv->name); + cv->value = strdupz(value); + + struct config_option *found = appconfig_option_index_add(co, cv); + if(found != cv) { + error("indexing of config '%s' in section '%s': already exists - using the existing one.", cv->name, co->name); + freez(cv->value); + freez(cv->name); + freez(cv); + return found; + } + + config_section_wrlock(co); + struct config_option *cv2 = co->values; + if(cv2) { + while (cv2->next) cv2 = cv2->next; + cv2->next = cv; + } + else co->values = cv; + config_section_unlock(co); + + return cv; +} + +int appconfig_exists(struct config *root, const char *section, const char *name) { + struct config_option *cv; + + debug(D_CONFIG, "request to get config in section '%s', name '%s'", section, name); + + struct section *co = appconfig_section_find(root, section); + if(!co) return 0; + + cv = appconfig_option_index_find(co, name, 0); + if(!cv) return 0; + + return 1; +} + +int appconfig_move(struct config *root, const char *section_old, const char *name_old, const char *section_new, const char *name_new) { + struct config_option *cv_old, *cv_new; + int ret = -1; + + debug(D_CONFIG, "request to rename config in section '%s', old name '%s', to section '%s', new name '%s'", section_old, name_old, section_new, name_new); + + struct section *co_old = appconfig_section_find(root, section_old); + if(!co_old) return ret; + + struct section *co_new = appconfig_section_find(root, section_new); + if(!co_new) co_new = appconfig_section_create(root, section_new); + + config_section_wrlock(co_old); + if(co_old != co_new) + config_section_wrlock(co_new); + + cv_old = appconfig_option_index_find(co_old, name_old, 0); + if(!cv_old) goto cleanup; + + cv_new = appconfig_option_index_find(co_new, name_new, 0); + if(cv_new) goto cleanup; + + if(unlikely(appconfig_option_index_del(co_old, cv_old) != cv_old)) + error("INTERNAL ERROR: deletion of config '%s' from section '%s', deleted tge wrong config entry.", cv_old->name, co_old->name); + + if(co_old->values == cv_old) { + co_old->values = cv_old->next; + } + else { + struct config_option *t; + for(t = co_old->values; t && t->next != cv_old ;t = t->next) ; + if(!t || t->next != cv_old) + error("INTERNAL ERROR: cannot find variable '%s' in section '%s' of the config - but it should be there.", cv_old->name, co_old->name); + else + t->next = cv_old->next; + } + + freez(cv_old->name); + cv_old->name = strdupz(name_new); + cv_old->hash = simple_hash(cv_old->name); + + cv_new = cv_old; + cv_new->next = co_new->values; + co_new->values = cv_new; + + if(unlikely(appconfig_option_index_add(co_new, cv_old) != cv_old)) + error("INTERNAL ERROR: re-indexing of config '%s' in section '%s', already exists.", cv_old->name, co_new->name); + + ret = 0; + +cleanup: + if(co_old != co_new) + config_section_unlock(co_new); + config_section_unlock(co_old); + return ret; +} + +char *appconfig_get_by_section(struct section *co, const char *name, const char *default_value) +{ + struct config_option *cv; + + // Only calls internal to this file check for a NULL result and they do not supply a NULL arg. + // External caller should treat NULL as an error case. + cv = appconfig_option_index_find(co, name, 0); + if (!cv) { + if (!default_value) return NULL; + cv = appconfig_value_create(co, name, default_value); + if (!cv) return NULL; + } + cv->flags |= CONFIG_VALUE_USED; + + if((cv->flags & CONFIG_VALUE_LOADED) || (cv->flags & CONFIG_VALUE_CHANGED)) { + // this is a loaded value from the config file + // if it is different than the default, mark it + if(!(cv->flags & CONFIG_VALUE_CHECKED)) { + if(default_value && strcmp(cv->value, default_value) != 0) cv->flags |= CONFIG_VALUE_CHANGED; + cv->flags |= CONFIG_VALUE_CHECKED; + } + } + + return(cv->value); +} + + +char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value) +{ + if (default_value == NULL) + debug(D_CONFIG, "request to get config in section '%s', name '%s' or fail", section, name); + else + debug(D_CONFIG, "request to get config in section '%s', name '%s', default_value '%s'", section, name, default_value); + + struct section *co = appconfig_section_find(root, section); + if (!co && !default_value) + return NULL; + if(!co) co = appconfig_section_create(root, section); + + return appconfig_get_by_section(co, name, default_value); +} + +long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value) +{ + char buffer[100], *s; + sprintf(buffer, "%lld", value); + + s = appconfig_get(root, section, name, buffer); + if(!s) return value; + + return strtoll(s, NULL, 0); +} + +LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value) +{ + char buffer[100], *s; + sprintf(buffer, "%0.5" LONG_DOUBLE_MODIFIER, value); + + s = appconfig_get(root, section, name, buffer); + if(!s) return value; + + return str2ld(s, NULL); +} + +static inline int appconfig_test_boolean_value(char *s) { + if(!strcasecmp(s, "yes") || !strcasecmp(s, "true") || !strcasecmp(s, "on") + || !strcasecmp(s, "auto") || !strcasecmp(s, "on demand")) + return 1; + + return 0; +} + +int appconfig_get_boolean_by_section(struct section *co, const char *name, int value) { + char *s; + + s = appconfig_get_by_section(co, name, (!value)?"no":"yes"); + if(!s) return value; + + return appconfig_test_boolean_value(s); +} + +int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value) +{ + char *s; + if(value) s = "yes"; + else s = "no"; + + s = appconfig_get(root, section, name, s); + if(!s) return value; + + return appconfig_test_boolean_value(s); +} + +int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value) +{ + char *s; + + if(value == CONFIG_BOOLEAN_AUTO) + s = "auto"; + + else if(value == CONFIG_BOOLEAN_NO) + s = "no"; + + else + s = "yes"; + + s = appconfig_get(root, section, name, s); + if(!s) return value; + + if(!strcmp(s, "yes")) + return CONFIG_BOOLEAN_YES; + else if(!strcmp(s, "no")) + return CONFIG_BOOLEAN_NO; + else if(!strcmp(s, "auto") || !strcmp(s, "on demand")) + return CONFIG_BOOLEAN_AUTO; + + return value; +} + +const char *appconfig_set_default(struct config *root, const char *section, const char *name, const char *value) +{ + struct config_option *cv; + + debug(D_CONFIG, "request to set default config in section '%s', name '%s', value '%s'", section, name, value); + + struct section *co = appconfig_section_find(root, section); + if(!co) return appconfig_set(root, section, name, value); + + cv = appconfig_option_index_find(co, name, 0); + if(!cv) return appconfig_set(root, section, name, value); + + cv->flags |= CONFIG_VALUE_USED; + + if(cv->flags & CONFIG_VALUE_LOADED) + return cv->value; + + if(strcmp(cv->value, value) != 0) { + cv->flags |= CONFIG_VALUE_CHANGED; + + freez(cv->value); + cv->value = strdupz(value); + } + + return cv->value; +} + +const char *appconfig_set(struct config *root, const char *section, const char *name, const char *value) +{ + struct config_option *cv; + + debug(D_CONFIG, "request to set config in section '%s', name '%s', value '%s'", section, name, value); + + struct section *co = appconfig_section_find(root, section); + if(!co) co = appconfig_section_create(root, section); + + cv = appconfig_option_index_find(co, name, 0); + if(!cv) cv = appconfig_value_create(co, name, value); + cv->flags |= CONFIG_VALUE_USED; + + if(strcmp(cv->value, value) != 0) { + cv->flags |= CONFIG_VALUE_CHANGED; + + freez(cv->value); + cv->value = strdupz(value); + } + + return value; +} + +long long appconfig_set_number(struct config *root, const char *section, const char *name, long long value) +{ + char buffer[100]; + sprintf(buffer, "%lld", value); + + appconfig_set(root, section, name, buffer); + + return value; +} + +LONG_DOUBLE appconfig_set_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value) +{ + char buffer[100]; + sprintf(buffer, "%0.5" LONG_DOUBLE_MODIFIER, value); + + appconfig_set(root, section, name, buffer); + + return value; +} + +int appconfig_set_boolean(struct config *root, const char *section, const char *name, int value) +{ + char *s; + if(value) s = "yes"; + else s = "no"; + + appconfig_set(root, section, name, s); + + return value; +} + +int appconfig_get_duration(struct config *root, const char *section, const char *name, const char *value) +{ + int result = 0; + const char *s; + + s = appconfig_get(root, section, name, value); + if(!s) goto fallback; + + if(!config_parse_duration(s, &result)) { + error("config option '[%s].%s = %s' is configured with an valid duration", section, name, s); + goto fallback; + } + + return result; + + fallback: + if(!config_parse_duration(value, &result)) + error("INTERNAL ERROR: default duration supplied for option '[%s].%s = %s' is not a valid duration", section, name, value); + + return result; +} + +// ---------------------------------------------------------------------------- +// config load/save + +int appconfig_load(struct config *root, char *filename, int overwrite_used, const char *section_name) +{ + int line = 0; + struct section *co = NULL; + int is_exporter_config = 0; + int _backends = 0; // number of backend sections we have + char working_instance[CONFIG_MAX_NAME + 1]; + char working_connector[CONFIG_MAX_NAME + 1]; + struct section *working_connector_section = NULL; + int global_exporting_section = 0; + + char buffer[CONFIG_FILE_LINE_MAX + 1], *s; + + if(!filename) filename = CONFIG_DIR "/" CONFIG_FILENAME; + + debug(D_CONFIG, "CONFIG: opening config file '%s'", filename); + + FILE *fp = fopen(filename, "r"); + if(!fp) { + // info("CONFIG: cannot open file '%s'. Using internal defaults.", filename); + return 0; + } + + uint32_t section_hash = 0; + if(section_name) { + section_hash = simple_hash(section_name); + } + is_exporter_config = (strstr(filename, EXPORTING_CONF) != NULL); + + while(fgets(buffer, CONFIG_FILE_LINE_MAX, fp) != NULL) { + buffer[CONFIG_FILE_LINE_MAX] = '\0'; + line++; + + s = trim(buffer); + if(!s || *s == '#') { + debug(D_CONFIG, "CONFIG: ignoring line %d of file '%s', it is empty.", line, filename); + continue; + } + + int len = (int) strlen(s); + if(*s == '[' && s[len - 1] == ']') { + // new section + s[len - 1] = '\0'; + s++; + + if (is_exporter_config) { + global_exporting_section = + !(strcmp(s, CONFIG_SECTION_EXPORTING)) || !(strcmp(s, CONFIG_SECTION_PROMETHEUS)); + if (unlikely(!global_exporting_section)) { + int rc; + rc = is_valid_connector(s, 0); + if (likely(rc)) { + strncpy(working_connector, s, CONFIG_MAX_NAME); + s = s + rc + 1; + if (unlikely(!(*s))) { + _backends++; + sprintf(buffer, "instance_%d", _backends); + s = buffer; + } + strncpy(working_instance, s, CONFIG_MAX_NAME); + working_connector_section = NULL; + if (unlikely(appconfig_section_find(root, working_instance))) { + error("Instance (%s) already exists", working_instance); + co = NULL; + continue; + } + } else { + co = NULL; + error("Section (%s) does not specify a valid connector", s); + continue; + } + } + } + + co = appconfig_section_find(root, s); + if(!co) co = appconfig_section_create(root, s); + + if(co && section_name && overwrite_used && section_hash == co->hash && !strcmp(section_name, co->name)) { + config_section_wrlock(co); + struct config_option *cv2 = co->values; + while (cv2) { + struct config_option *save = cv2->next; + struct config_option *found = appconfig_option_index_del(co, cv2); + if(found != cv2) + error("INTERNAL ERROR: Cannot remove '%s' from section '%s', it was not inserted before.", + cv2->name, co->name); + + freez(cv2->name); + freez(cv2->value); + freez(cv2); + cv2 = save; + } + co->values = NULL; + config_section_unlock(co); + } + + continue; + } + + if(!co) { + // line outside a section + error("CONFIG: ignoring line %d ('%s') of file '%s', it is outside all sections.", line, s, filename); + continue; + } + + if(section_name && overwrite_used && section_hash != co->hash && strcmp(section_name, co->name)) { + continue; + } + + char *name = s; + char *value = strchr(s, '='); + if(!value) { + error("CONFIG: ignoring line %d ('%s') of file '%s', there is no = in it.", line, s, filename); + continue; + } + *value = '\0'; + value++; + + name = trim(name); + value = trim(value); + + if(!name || *name == '#') { + error("CONFIG: ignoring line %d of file '%s', name is empty.", line, filename); + continue; + } + + if(!value) value = ""; + + struct config_option *cv = appconfig_option_index_find(co, name, 0); + + if (!cv) { + cv = appconfig_value_create(co, name, value); + if (likely(is_exporter_config) && unlikely(!global_exporting_section)) { + if (unlikely(!working_connector_section)) { + working_connector_section = appconfig_section_find(root, working_connector); + if (!working_connector_section) + working_connector_section = appconfig_section_create(root, working_connector); + if (likely(working_connector_section)) { + add_connector_instance(working_connector_section, co); + } + } + } + } else { + if (((cv->flags & CONFIG_VALUE_USED) && overwrite_used) || !(cv->flags & CONFIG_VALUE_USED)) { + debug( + D_CONFIG, "CONFIG: line %d of file '%s', overwriting '%s/%s'.", line, filename, co->name, cv->name); + freez(cv->value); + cv->value = strdupz(value); + } else + debug( + D_CONFIG, + "CONFIG: ignoring line %d of file '%s', '%s/%s' is already present and used.", + line, + filename, + co->name, + cv->name); + } + cv->flags |= CONFIG_VALUE_LOADED; + } + + fclose(fp); + + return 1; +} + +void appconfig_generate(struct config *root, BUFFER *wb, int only_changed) +{ + int i, pri; + struct section *co; + struct config_option *cv; + + for(i = 0; i < 3 ;i++) { + switch(i) { + case 0: + buffer_strcat(wb, + "# netdata configuration\n" + "#\n" + "# You can download the latest version of this file, using:\n" + "#\n" + "# wget -O /etc/netdata/netdata.conf http://localhost:19999/netdata.conf\n" + "# or\n" + "# curl -o /etc/netdata/netdata.conf http://localhost:19999/netdata.conf\n" + "#\n" + "# You can uncomment and change any of the options below.\n" + "# The value shown in the commented settings, is the default value.\n" + "#\n" + "\n# global netdata configuration\n"); + break; + + case 1: + buffer_strcat(wb, "\n\n# per plugin configuration\n"); + break; + + case 2: + buffer_strcat(wb, "\n\n# per chart configuration\n"); + break; + } + + appconfig_wrlock(root); + for(co = root->first_section; co ; co = co->next) { + if(!strcmp(co->name, CONFIG_SECTION_GLOBAL) + || !strcmp(co->name, CONFIG_SECTION_WEB) + || !strcmp(co->name, CONFIG_SECTION_STATSD) + || !strcmp(co->name, CONFIG_SECTION_PLUGINS) + || !strcmp(co->name, CONFIG_SECTION_CLOUD) + || !strcmp(co->name, CONFIG_SECTION_REGISTRY) + || !strcmp(co->name, CONFIG_SECTION_HEALTH) + || !strcmp(co->name, CONFIG_SECTION_BACKEND) + || !strcmp(co->name, CONFIG_SECTION_STREAM) + || !strcmp(co->name, CONFIG_SECTION_HOST_LABEL) + ) + pri = 0; + else if(!strncmp(co->name, "plugin:", 7)) pri = 1; + else pri = 2; + + if(i == pri) { + int loaded = 0; + int used = 0; + int changed = 0; + int count = 0; + + config_section_wrlock(co); + for(cv = co->values; cv ; cv = cv->next) { + used += (cv->flags & CONFIG_VALUE_USED)?1:0; + loaded += (cv->flags & CONFIG_VALUE_LOADED)?1:0; + changed += (cv->flags & CONFIG_VALUE_CHANGED)?1:0; + count++; + } + config_section_unlock(co); + + if(!count) continue; + if(only_changed && !changed && !loaded) continue; + + if(!used) { + buffer_sprintf(wb, "\n# section '%s' is not used.", co->name); + } + + buffer_sprintf(wb, "\n[%s]\n", co->name); + + config_section_wrlock(co); + for(cv = co->values; cv ; cv = cv->next) { + + if(used && !(cv->flags & CONFIG_VALUE_USED)) { + buffer_sprintf(wb, "\n\t# option '%s' is not used.\n", cv->name); + } + buffer_sprintf(wb, "\t%s%s = %s\n", ((!(cv->flags & CONFIG_VALUE_LOADED)) && (!(cv->flags & CONFIG_VALUE_CHANGED)) && (cv->flags & CONFIG_VALUE_USED))?"# ":"", cv->name, cv->value); + } + config_section_unlock(co); + } + } + appconfig_unlock(root); + } +} + +/** + * Parse Duration + * + * Parse the string setting the result + * + * @param string the timestamp string + * @param result the output variable + * + * @return It returns 1 on success and 0 otherwise + */ +int config_parse_duration(const char* string, int* result) { + while(*string && isspace(*string)) string++; + + if(unlikely(!*string)) goto fallback; + + if(*string == 'n' && !strcmp(string, "never")) { + // this is a valid option + *result = 0; + return 1; + } + + // make sure it is a number + if(!(isdigit(*string) || *string == '+' || *string == '-')) goto fallback; + + char *e = NULL; + calculated_number n = str2ld(string, &e); + if(e && *e) { + switch (*e) { + case 'Y': + *result = (int) (n * 31536000); + break; + case 'M': + *result = (int) (n * 2592000); + break; + case 'w': + *result = (int) (n * 604800); + break; + case 'd': + *result = (int) (n * 86400); + break; + case 'h': + *result = (int) (n * 3600); + break; + case 'm': + *result = (int) (n * 60); + break; + case 's': + default: + *result = (int) (n); + break; + } + } + else + *result = (int)(n); + + return 1; + + fallback: + *result = 0; + return 0; +} + +struct section *appconfig_get_section(struct config *root, const char *name) +{ + return appconfig_section_find(root, name); +} diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h new file mode 100644 index 0000000..9d02e4a --- /dev/null +++ b/libnetdata/config/appconfig.h @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +/* + * This section manages ini config files, like netdata.conf and stream.conf + * + * It is organized like this: + * + * struct config (i.e. netdata.conf or stream.conf) + * .sections = a linked list of struct section + * .mutex = a mutex to protect the above linked list due to multi-threading + * .index = an AVL tree of struct section + * + * struct section (i.e. [global] or [health] of netdata.conf) + * .value = a linked list of struct config_option + * .mutex = a mutex to protect the above linked list due to multi-threading + * .value_index = an AVL tree of struct config_option + * + * struct config_option (ie. a name-value pair for each ini file option) + * + * The following operations on name-value options are supported: + * SET to set the value of an option + * SET DEFAULT to set the value and the default value of an option + * GET to get the value of an option + * EXISTS to check if an option exists + * MOVE to move an option from a section to another section, and/or rename it + * + * GET and SET operations are provided for the following data types: + * STRING + * NUMBER (long long) + * FLOAT (long double) + * BOOLEAN (false, true) + * BOOLEAN ONDEMAND (false, true, auto) + * + * GET and SET operations create struct config_option, if it is not already present. + * This allows netdata to run even without netdata.conf and stream.conf. The internal + * defaults are used to create the structure that should exist in the ini file and the config + * file can be downloaded from the server. + * + * Also 2 operations are supported for the whole config file: + * + * LOAD To load the ini file from disk + * GENERATE To generate the ini file (this is used to download the ini file from the server) + * + * For each option (name-value pair), the system maintains 4 flags: + * LOADED to indicate that the value has been loaded from the file + * USED to indicate that netdata used the value + * CHANGED to indicate that the value has been changed from the loaded value or the internal default value + * CHECKED is used internally for optimization (to avoid an strcmp() every time GET is called). + * + * TODO: + * 1. The linked lists and the mutexes can be removed and the AVL trees can become DICTIONARY. + * This part of the code was written before we add traversal to AVL. + * + * 2. High level data types could be supported, to simplify the rest of the code: + * MULTIPLE CHOICE to let the user select one of the supported keywords + * this would allow users see in comments the available options + * + * SIMPLE PATTERN to let the user define netdata SIMPLE PATTERNS + * + * 3. Sorting of options should be supported. + * Today, when the ini file is downloaded from the server, the options are shown in the order + * they appear in the linked list (the order they were added, listing changed options first). + * If we remove the linked list, the order they appear in the AVL tree will be used (which is + * random due to simple_hash()). + * Ideally, we support sorting of options when generating the ini file. + * + * 4. There is no free() operation. So, memory is freed on netdata exit. + * + * 5. Avoid memory fragmentation + * Since entries are created from multiple threads and a lot of allocations are required + * for each config_option, fragmentation can be a problem for IoT. + * + * 6. Although this way of managing options is quite flexible and dynamic, it wastes memory + * for the names of the options. Since most of the option names are static, we could provide + * a method to allocate only the dynamic option names. + */ + +#ifndef NETDATA_CONFIG_H +#define NETDATA_CONFIG_H 1 + +#include "../libnetdata.h" + +#define CONFIG_FILENAME "netdata.conf" + +#define CONFIG_SECTION_GLOBAL "global" +#define CONFIG_SECTION_WEB "web" +#define CONFIG_SECTION_STATSD "statsd" +#define CONFIG_SECTION_PLUGINS "plugins" +#define CONFIG_SECTION_CLOUD "cloud" +#define CONFIG_SECTION_REGISTRY "registry" +#define CONFIG_SECTION_HEALTH "health" +#define CONFIG_SECTION_BACKEND "backend" +#define CONFIG_SECTION_STREAM "stream" +#define CONFIG_SECTION_EXPORTING "exporting:global" +#define CONFIG_SECTION_PROMETHEUS "prometheus:exporter" +#define CONFIG_SECTION_HOST_LABEL "host labels" +#define EXPORTING_CONF "exporting.conf" + +// these are used to limit the configuration names and values lengths +// they are not enforced by config.c functions (they will strdup() all strings, no matter of their length) +#define CONFIG_MAX_NAME 1024 +#define CONFIG_MAX_VALUE 2048 + +// ---------------------------------------------------------------------------- +// Config definitions +#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2) + +#define CONFIG_VALUE_LOADED 0x01 // has been loaded from the config +#define CONFIG_VALUE_USED 0x02 // has been accessed from the program +#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value +#define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default + +struct config_option { + avl avl_node; // the index entry of this entry - this has to be first! + + uint8_t flags; + uint32_t hash; // a simple hash to speed up searching + // we first compare hashes, and only if the hashes are equal we do string comparisons + + char *name; + char *value; + + struct config_option *next; // config->mutex protects just this +}; + +struct section { + avl avl_node; // the index entry of this section - this has to be first! + + uint32_t hash; // a simple hash to speed up searching + // we first compare hashes, and only if the hashes are equal we do string comparisons + + char *name; + + struct section *next; // gloabl config_mutex protects just this + + struct config_option *values; + avl_tree_lock values_index; + + netdata_mutex_t mutex; // this locks only the writers, to ensure atomic updates + // readers are protected using the rwlock in avl_tree_lock +}; + +struct config { + struct section *first_section; + struct section *last_section; // optimize inserting at the end + netdata_mutex_t mutex; + avl_tree_lock index; +}; + +#define CONFIG_BOOLEAN_INVALID 100 // an invalid value to check for validity (used as default initialization when needed) + +#define CONFIG_BOOLEAN_NO 0 // disabled +#define CONFIG_BOOLEAN_YES 1 // enabled + +#ifndef CONFIG_BOOLEAN_AUTO +#define CONFIG_BOOLEAN_AUTO 2 // enabled if it has useful info when enabled +#endif + +extern int appconfig_load(struct config *root, char *filename, int overwrite_used, const char *section_name); +extern void config_section_wrlock(struct section *co); +extern void config_section_unlock(struct section *co); + +extern char *appconfig_get_by_section(struct section *co, const char *name, const char *default_value); +extern char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value); +extern long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value); +extern LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value); +extern int appconfig_get_boolean_by_section(struct section *co, const char *name, int value); +extern int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value); +extern int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value); +extern int appconfig_get_duration(struct config *root, const char *section, const char *name, const char *value); + +extern const char *appconfig_set(struct config *root, const char *section, const char *name, const char *value); +extern const char *appconfig_set_default(struct config *root, const char *section, const char *name, const char *value); +extern long long appconfig_set_number(struct config *root, const char *section, const char *name, long long value); +extern LONG_DOUBLE appconfig_set_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value); +extern int appconfig_set_boolean(struct config *root, const char *section, const char *name, int value); + +extern int appconfig_exists(struct config *root, const char *section, const char *name); +extern int appconfig_move(struct config *root, const char *section_old, const char *name_old, const char *section_new, const char *name_new); + +extern void appconfig_generate(struct config *root, BUFFER *wb, int only_changed); + +extern int appconfig_section_compare(void *a, void *b); + +extern void appconfig_section_destroy_non_loaded(struct config *root, const char *section); + +extern int config_parse_duration(const char* string, int* result); + +extern struct section *appconfig_get_section(struct config *root, const char *name); + +extern void appconfig_wrlock(struct config *root); +extern void appconfig_unlock(struct config *root); + +struct connector_instance { + char instance_name[CONFIG_MAX_NAME + 1]; + char connector_name[CONFIG_MAX_NAME + 1]; +}; + +typedef struct _connector_instance { + struct section *connector; // actual connector + struct section *instance; // This instance + char instance_name[CONFIG_MAX_NAME + 1]; + char connector_name[CONFIG_MAX_NAME + 1]; + struct _connector_instance *next; // Next instance +} _CONNECTOR_INSTANCE; + +extern _CONNECTOR_INSTANCE *add_connector_instance(struct section *connector, struct section *instance); + +#endif /* NETDATA_CONFIG_H */ |