150 lines
6.5 KiB
Markdown
150 lines
6.5 KiB
Markdown
# OpenCHAMI Configurator
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The `configurator` (portmanteau of config + generator) is an extensible tool that fetchs data from an instance of [SMD](https://github.com/OpenCHAMI/smd) to generate commonly used config files based on Jinja 2 template files. The tool and generator plugins are written in Go and plugins can be written by following the ["Creating Generator Plugins"](#creating-generator-plugins) section of this README.
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## Building and Usage
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The `configurator` is built using standard `go` build tools. The project separates the client and server with build tags. To get started, clone the project, download the dependencies, and build the project:
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```bash
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git clone https://github.com/OpenCHAMI/configurator.git
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go mod tidy
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go build --tags all # equivalent to `go build --tags client,server``
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## ...or just run `make` in project directory
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```
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This will build the main driver program, but also requires generator plugins to define how new config files are generated. The default plugins can be built using the following build command:
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```bash
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go build -buildmode=plugin -o lib/conman.so internal/generator/plugins/conman/conman.go
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go build -buildmode=plugin -o lib/coredhcp.so internal/generator/plugins/coredhcp/coredhcp.go
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go build -buildmode=plugin -o lib/dnsmasq.so internal/generator/plugins/dnsmasq/dnsmasq.go
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go build -buildmode=plugin -o lib/powerman.so internal/generator/plugins/powerman/powerman.go
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go build -buildmode=plugin -o lib/syslog.so internal/generator/plugins/syslog/syslog.go
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```
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These commands will build the default plugins and store them in the "lib" directory by default. Alternatively, the plugins can be built using `make plugins` if GNU make is installed and available. After you build the plugins, run the following to use the tool:
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```bash
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./configurator generate --config config.yaml --target dnsmasq -o dnsmasq.conf
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```
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This will generate a new `dnsmasq` config file based on the Jinja 2 template specified in the config file for "dnsmasq". The `--target` flag specifies the type of config file to generate by its name (see the [`Creating Generator Plugins`](#creating-generator-plugins) section for details). The `configurator` tool requires a valid access token when making requests to an instance of SMD that has protected routes.
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The tool can also run as a service to generate files for clients:
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```bash
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./configurator serve --config config.yaml
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```
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Once the server is up and listening for HTTP requests, you can try making a request to it with `curl` or `configurator fetch`. Both commands below are essentially equivalent:
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```bash
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curl http://127.0.0.1:3334/generate?target=dnsmasq
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# ...or...
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./configurator fetch --target dnsmasq --host http://127.0.0.1 --port 3334
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```
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This will do the same thing as the `generate` subcommand, but remotely.
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### Creating Generator Plugins
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The `configurator` uses generator plugins to define how config files are generated using a `Generator` interface. The interface is defined like so:
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```go
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type Generator interface {
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GetName() string
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GetGroups() []string
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Generate(config *configurator.Config, opts ...util.Option) ([]byte, error)
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}
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```
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A new plugin can be created by implementing the methods from interface and exporting a symbol with `Generator` as the name and the plugin struct as the type. The `GetName()` function returns the name that is used for looking up the corresponding template set in your config file. The `GetGroups()` function is used to look all of the groups that the plugin is included. The `Generate` function is where the magic happens to build the config file from a template.
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```go
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package main
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type MyGenerator struct {}
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func (g *MyGenerator) GetName() string {
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return "my-generator"
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}
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func (g *MyGenerator) GetGroups() []string {
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return []string{ "my-generator" }
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}
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func (g *MyGenerator) Generate(config *configurator.Config, opts ...util.Option) ([]byte, error) {
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// do config generation stuff here...
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var (
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params = generator.GetParams(opts...)
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client = generator.GetClient(params)
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output = ""
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)
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if client {
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eths, err := client.FetchEthernetInterfaces(opts...)
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// ... blah, blah, blah, format output, and so on...
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}
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// apply the template and get substituted output as byte array
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return generator.ApplyTemplate(path, generator.Mappings{
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"hosts": output,
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})
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}
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// this MUST be named "Generator" for symbol lookup
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var Generator MyGenerator
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```
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Finally, build the plugin and put it somewhere specified by `plugins` in your config. Make sure that the package is `main` before building.
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```bash
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go build -buildmode=plugin -o lib/mygenerator.so path/to/mygenerator.go
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```
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Now your plugin should be available to use with the `configurator` main driver.
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## Configuration
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Here is an example config file to start using configurator:
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```yaml
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server: # server settings when using as service
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host: 127.0.0.1
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port: 3334
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jwks: # set URL for JWKS to enable auth
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uri: ""
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retries: 5
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smd: # settings for SMD service
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host: http://127.0.0.1
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port: 27779
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templates: # template mappings to generator plugins (by name)
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dnsmasq: templates/dnsmasq.jinja
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coredhcp: templates/coredhcp.jinja
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syslog: templates/syslog.jinja
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ansible: templates/ansible.jinja
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powerman: templates/powerman.jinja
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conman: templates/conman.jinja
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groups: # (WIP) setting to allow creating configs by groups
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warewulf:
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- dnsmasq
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- syslog
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- ansible
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- powerman
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- conman
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plugins: # path to plugin directories (may change to include files as well)
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- "lib/"
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```
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The `server` section sets the properties for running the `configurator` tool as a service and is not required if you're only using the CLI. Also note that the `jwks-uri` parameter is only needs for protecting endpoints. If it is not set, then the API is entirely public. The `smd` section tells the `configurator` tool where to find SMD to pull state management data used by the internal client. The `templates` section is where the paths are mapped to each generator plugin by its name (see the [`Creating Generator Plugins`](#creating-generator-plugins) section for details). The `plugins` is a list of paths to load generator plugins.
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## Known Issues
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- Adds a new `OAuthClient` with every token request
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## TODO
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- Add group functionality to create by files by groups
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- Extend SMD client functionality (or make extensible?)
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- Handle authentication with `OAuthClient`'s correctly
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