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diff --git a/libnetdata/dyn_conf/README.md b/libnetdata/dyn_conf/README.md new file mode 100644 index 00000000..6c812740 --- /dev/null +++ b/libnetdata/dyn_conf/README.md @@ -0,0 +1,167 @@ +# Netdata Dynamic Configuration + +Purpose of Netdata Dynamic Configuration is to allow configuration of select Netdata plugins and options through the +Netdata API and by extension by UI. + +## HTTP API documentation + +### Summary API + +For summary of all jobs and their statuses (for all children that stream to parent) use the following URL: + +| Method | Endpoint | Description | +|:-------:|-------------------------------|------------------------------------------------------------| +| **GET** | `api/v2/job_statuses` | list of Jobs | +| **GET** | `api/v2/job_statuses?grouped` | list of Jobs (hierarchical, grouped by host/plugin/module) | + +### Dyncfg API + +### Top level + +| Method | Endpoint | Description | +|:-------:|------------------|-----------------------------------------| +| **GET** | `/api/v2/config` | registered Plugins (sent DYNCFG_ENABLE) | + +### Plugin level + +| Method | Endpoint | Description | +|:-------:|-----------------------------------|------------------------------| +| **GET** | `/api/v2/config/[plugin]` | Plugin config | +| **PUT** | `/api/v2/config/[plugin]` | update Plugin config | +| **GET** | `/api/v2/config/[plugin]/modules` | Modules registered by Plugin | +| **GET** | `/api/v2/config/[plugin]/schema` | Plugin config schema | + +### Module level + +| Method | Endpoint | Description | +|:-------:|-----------------------------------------------|---------------------------| +| **GET** | `/api/v2/config/<plugin>/[module]` | Module config | +| **PUT** | `/api/v2/config/[plugin]/[module]` | update Module config | +| **GET** | `/api/v2/config/[plugin]/[module]/jobs` | Jobs registered by Module | +| **GET** | `/api/v2/config/[plugin]/[module]/job_schema` | Job config schema | +| **GET** | `/api/v2/config/[plugin]/[module]/schema` | Module config schema | + +### Job level - only for modules where `module_type == job_array` + +| Method | Endpoint | Description | +|:----------:|------------------------------------------|--------------------------------| +| **GET** | `/api/v2/config/[plugin]/[module]/[job]` | Job config | +| **PUT** | `/api/v2/config/[plugin]/[module]/[job]` | update Job config | +| **POST** | `/api/v2/config/[plugin]/[module]/[job]` | create Job | +| **DELETE** | `/api/v2/config/[plugin]/[module]/[job]` | delete Job (created by Dyncfg) | + +## AGENT<->PLUGIN interface documentation + +### 1. DYNCFG_ENABLE + +Plugin signifies to agent its ability to use new dynamic config and the name it wishes to use by sending + +``` +plugin->agent: +============= +DYNCFG_ENABLE [plugin_url_name] +``` + +This can be sent only once per lifetime of the plugin (at startup or later) sending it multiple times is considered a +protocol violation and plugin might get terminated. +After this command is sent the plugin has to be ready to accept all the new commands/keywords related to dynamic +configuration (this command lets agent know this plugin is dyncfg capable and wishes to use dyncfg functionality). + +After this command agent can call + +``` +agent->plugin: +============= +FUNCTION_PAYLOAD [UUID] 1 "set_plugin_config" +the new configuration +blah blah blah +FUNCTION_PAYLOAD_END + +plugin->agent: +============= +FUNCTION_RESULT_BEGIN [UUID] [(1/0)(accept/reject)] [text/plain] 5 +FUNCTION_RESULT_END +``` + +to set the new config which can be accepted/rejected by plugin by sending answer for this FUNCTION as it would with any +other regular function. + +The new `FUNCTION_PAYLOAD` command differs from regular `FUNCTION` command exclusively in its ability to send bigger +payloads (configuration file contents) to the plugin (not just parameters list). + +Agent can also call (after `DYNCFG_ENABLE`) + +``` +Agent->plugin: +============= +FUNCTION [UID] 1 "get_plugin_config" + +Plugin->agent: +============= +FUNCTION_RESULT_BEGIN [UID] 1 text/plain 5 +{ + "the currently used config from plugin" : "nice" +} +FUNCTION_RESULT_END +``` + +and + +``` +Agent->plugin: +============= +FUNCTION [UID] 1 "get_plugin_config_schema" + +Plugin->agent: +============= +FUNCTION_RESULT_BEGIN [UID] 1 text/plain 5 +{ + "the schema of plugin configuration" : "splendid" +} +FUNCTION_RESULT_END +``` + +Plugin can also register zero, one or more configurable modules using: + +``` +plugin->agent: +============= +DYNCFG_REGISTER_MODULE [module_url_name] (job_array|single) +``` + +modules can be added any time during plugins lifetime (you are not required to add them all at startup). + +### 2. DYNCFG_REGISTER_MODULE + +Module has to choose one of following types at registration: + +- `single` - module itself has configuration but does not accept any jobs *(this is useful mainly for internal netdata + configurable things like webserver etc.)* +- `job_array` - module itself **can** *(not must)* have configuration and it has an array of jobs which can be added, + modified and deleted. **this is what plugin developer needs in most cases** + +After module has been registered agent can call + +- `set_module_config [module]` FUNCTION_PAYLOAD +- `get_module_config [module]` FUNCTION +- `get_module_config_schema [module]` FUNCTION + +with same syntax as `set_plugin_config` and `get_plugin_config`. In case of `set` command the plugin has ability to +reject the new configuration pushed to it. + +In a case the module was registered as `job_array` type following commands can be used to manage jobs: + +### 3. Job interface for job_array modules + +- `get_job_config_schema [module]` - FUNCTION +- `get_job_config [module] [job]` - FUNCTION +- `set_job_config [module] [job]` - FUNCTION_PAYLOAD +- `delete_job_name [module] [job]` - FUNCTION + +### 4. Streaming + +When above commands are transferred trough streaming additionally `plugin_name` is prefixed as first parameter. This is +done to allow routing to appropriate plugin @child. + +As a plugin developer you don't need to concern yourself with this detail as that parameter is stripped when sent to the +plugin *(and added when sent trough streaming)* automagically. |