diff options
author | Costa Tsaousis <costa@tsaousis.gr> | 2018-10-15 23:16:42 +0300 |
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committer | GitHub <noreply@github.com> | 2018-10-15 23:16:42 +0300 |
commit | 8fbf817ef83b3524b15f908251909d9d6feb5532 (patch) | |
tree | 4c2d417b7392c907bbdbe355b8db361bd3741a02 /libnetdata/config/appconfig.h | |
parent | 1ad4f1bcfc691120102b57dbd426de0870abd76f (diff) |
modularized all source code (#4391)
* modularized all external plugins
* added README.md in plugins
* fixed title
* fixed typo
* relative link to external plugins
* external plugins configuration README
* added plugins link
* remove plugins link
* plugin names are links
* added links to external plugins
* removed unecessary spacing
* list to table
* added language
* fixed typo
* list to table on internal plugins
* added more documentation to internal plugins
* moved python, node, and bash code and configs into the external plugins
* added statsd README
* fix bug with corrupting config.h every 2nd compilation
* moved all config files together with their code
* more documentation
* diskspace info
* fixed broken links in apps.plugin
* added backends docs
* updated plugins readme
* move nc-backend.sh to backends
* created daemon directory
* moved all code outside src/
* fixed readme identation
* renamed plugins.d.plugin to plugins.d
* updated readme
* removed linux- from linux plugins
* updated readme
* updated readme
* updated readme
* updated readme
* updated readme
* updated readme
* fixed README.md links
* fixed netdata tree links
* updated codacy, codeclimate and lgtm excluded paths
* update CMakeLists.txt
* updated automake options at top directory
* libnetdata slit into directories
* updated READMEs
* updated READMEs
* updated ARL docs
* updated ARL docs
* moved /plugins to /collectors
* moved all external plugins outside plugins.d
* updated codacy, codeclimate, lgtm
* updated README
* updated url
* updated readme
* updated readme
* updated readme
* updated readme
* moved api and web into webserver
* web/api web/gui web/server
* modularized webserver
* removed web/gui/version.txt
Diffstat (limited to 'libnetdata/config/appconfig.h')
-rw-r--r-- | libnetdata/config/appconfig.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h new file mode 100644 index 0000000000..bd37171e6c --- /dev/null +++ b/libnetdata/config/appconfig.h @@ -0,0 +1,156 @@ +// 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_REGISTRY "registry" +#define CONFIG_SECTION_HEALTH "health" +#define CONFIG_SECTION_BACKEND "backend" +#define CONFIG_SECTION_STREAM "stream" + +// 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 + +struct config { + struct section *sections; + netdata_mutex_t mutex; + avl_tree_lock index; +}; + +extern struct config + netdata_config, + stream_config; + +#define CONFIG_BOOLEAN_NO 0 +#define CONFIG_BOOLEAN_YES 1 + +#ifndef CONFIG_BOOLEAN_AUTO +#define CONFIG_BOOLEAN_AUTO 2 +#endif + +extern int appconfig_load(struct config *root, char *filename, int overwrite_used); + +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(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 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); + +// ---------------------------------------------------------------------------- +// shortcuts for the default netdata configuration + +#define config_load(filename, overwrite_used) appconfig_load(&netdata_config, filename, overwrite_used) +#define config_get(section, name, default_value) appconfig_get(&netdata_config, section, name, default_value) +#define config_get_number(section, name, value) appconfig_get_number(&netdata_config, section, name, value) +#define config_get_float(section, name, value) appconfig_get_float(&netdata_config, section, name, value) +#define config_get_boolean(section, name, value) appconfig_get_boolean(&netdata_config, section, name, value) +#define config_get_boolean_ondemand(section, name, value) appconfig_get_boolean_ondemand(&netdata_config, section, name, value) + +#define config_set(section, name, default_value) appconfig_set(&netdata_config, section, name, default_value) +#define config_set_default(section, name, value) appconfig_set_default(&netdata_config, section, name, value) +#define config_set_number(section, name, value) appconfig_set_number(&netdata_config, section, name, value) +#define config_set_float(section, name, value) appconfig_set_float(&netdata_config, section, name, value) +#define config_set_boolean(section, name, value) appconfig_set_boolean(&netdata_config, section, name, value) + +#define config_exists(section, name) appconfig_exists(&netdata_config, section, name) +#define config_move(section_old, name_old, section_new, name_new) appconfig_move(&netdata_config, section_old, name_old, section_new, name_new) + +#define config_generate(buffer, only_changed) appconfig_generate(&netdata_config, buffer, only_changed) + +#endif /* NETDATA_CONFIG_H */ |