[Flow] Add discovery.uyuni component

CHANGELOG.md

@@ -21,6 +21,7 @@ Main (unreleased)
   - `prometheus.exporter.gcp` - scrape GCP metrics (@tburgessdev)
   - `otelcol.processor.span` - accepts traces telemetry data from other `otelcol`
   components and modifies the names and attributes of the spans. (@ptodev)
+  - `discovery.uyuni` discovers scrape targets from a Uyuni Server. (@sparta0x117)
 
 ### Bugfixes
 

component/all/all.go

@@ -14,6 +14,7 @@ import (
 	_ "github.com/grafana/agent/component/discovery/kubelet"                        // Import discovery.kubelet
 	_ "github.com/grafana/agent/component/discovery/kubernetes"                     // Import discovery.kubernetes
 	_ "github.com/grafana/agent/component/discovery/relabel"                        // Import discovery.relabel
+	_ "github.com/grafana/agent/component/discovery/uyuni"                          // Import discovery.uyuni
 	_ "github.com/grafana/agent/component/local/file"                               // Import local.file
 	_ "github.com/grafana/agent/component/local/file_match"                         // Import local.file_match
 	_ "github.com/grafana/agent/component/loki/echo"                                // Import loki.echo

component/discovery/uyuni/uyuni.go

@@ -0,0 +1,92 @@
+package uyuni
+
+import (
+	"fmt"
+	"net/url"
+	"time"
+
+	"github.com/grafana/agent/component"
+	"github.com/grafana/agent/component/common/config"
+	"github.com/grafana/agent/component/discovery"
+	"github.com/grafana/agent/pkg/river/rivertypes"
+	promcfg "github.com/prometheus/common/config"
+	"github.com/prometheus/common/model"
+	prom_discovery "github.com/prometheus/prometheus/discovery/uyuni"
+)
+
+func init() {
+	component.Register(component.Registration{
+		Name:    "discovery.uyuni",
+		Args:    Arguments{},
+		Exports: discovery.Exports{},
+
+		Build: func(opts component.Options, args component.Arguments) (component.Component, error) {
+			return New(opts, args.(Arguments))
+		},
+	})
+}
+
+type Arguments struct {
+	Server          string            `river:"server,attr"`
+	Username        string            `river:"username,attr"`
+	Password        rivertypes.Secret `river:"password,attr"`
+	Entitlement     string            `river:"entitlement,attr,optional"`
+	Separator       string            `river:"separator,attr,optional"`
+	RefreshInterval time.Duration     `river:"refresh_interval,attr,optional"`
+
+	ProxyURL        config.URL       `river:"proxy_url,attr,optional"`
+	TLSConfig       config.TLSConfig `river:"tls_config,block,optional"`
+	FollowRedirects bool             `river:"follow_redirects,attr,optional"`
+	EnableHTTP2     bool             `river:"enable_http2,attr,optional"`
+}
+
+var DefaultArguments = Arguments{
+	Entitlement:     "monitoring_entitled",
+	Separator:       ",",
+	RefreshInterval: 1 * time.Minute,
+
+	EnableHTTP2:     config.DefaultHTTPClientConfig.EnableHTTP2,
+	FollowRedirects: config.DefaultHTTPClientConfig.FollowRedirects,
+}
+
+// SetToDefault implements river.Defaulter.
+func (a *Arguments) SetToDefault() {
+	*a = DefaultArguments
+}
+
+// Validate implements river.Validator.
+func (a *Arguments) Validate() error {
+	_, err := url.Parse(a.Server)
+	if err != nil {
+		return fmt.Errorf("invalid server URL: %w", err)
+	}
+	return a.TLSConfig.Validate()
+}
+
+func (a *Arguments) Convert() *prom_discovery.SDConfig {
+	return &prom_discovery.SDConfig{
+		Server:          a.Server,
+		Username:        a.Username,
+		Password:        promcfg.Secret(a.Password),
+		Entitlement:     a.Entitlement,
+		Separator:       a.Separator,
+		RefreshInterval: model.Duration(a.RefreshInterval),
+
+		HTTPClientConfig: promcfg.HTTPClientConfig{
+			ProxyConfig: promcfg.ProxyConfig{
+				ProxyURL: a.ProxyURL.Convert(),
+			},
+			TLSConfig:       *a.TLSConfig.Convert(),
+			FollowRedirects: a.FollowRedirects,
+			EnableHTTP2:     a.EnableHTTP2,
+		},
+	}
+}
+
+// New returns a new instance of a discovery.uyuni component.
+func New(opts component.Options, args Arguments) (*discovery.Component, error) {
+	return discovery.New(opts, args, func(args component.Arguments) (discovery.Discoverer, error) {
+		newArgs := args.(Arguments)
+		return prom_discovery.NewDiscovery(newArgs.Convert(), opts.Logger)
+	})
+}

component/discovery/uyuni/uyuni_test.go

@@ -0,0 +1,67 @@
+package uyuni
+
+import (
+	"testing"
+	"time"
+
+	"github.com/grafana/agent/component/common/config"
+	"github.com/grafana/agent/pkg/river"
+	promcfg "github.com/prometheus/common/config"
+	"github.com/prometheus/common/model"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUnmarshal(t *testing.T) {
+	cfg := `
+	server = "https://uyuni.com"
+	username = "exampleuser"
+	password = "examplepassword"
+	refresh_interval = "1m"
+	tls_config {
+		ca_file   = "/etc/ssl/certs/ca-certificates.crt"
+		cert_file = "/etc/ssl/certs/client.crt"
+		key_file  = "/etc/ssl/certs/client.key"
+	}	
+	`
+	var args Arguments
+	err := river.Unmarshal([]byte(cfg), &args)
+	require.NoError(t, err)
+}
+
+func TestValidate(t *testing.T) {
+	invalidServer := Arguments{
+		Server:   "http://uyuni.com",
+		Username: "exampleuser",
+		Password: "examplepassword",
+		TLSConfig: config.TLSConfig{
+			CAFile:   "/etc/ssl/certs/ca-certificates.crt",
+			CertFile: "/etc/ssl/certs/client.crt",
+
+			// Check that the TLSConfig is being validated
+			KeyFile: "/etc/ssl/certs/client.key",
+			Key:     "key",
+		},
+	}
+
+	err := invalidServer.Validate()
+	require.Error(t, err)
+}
+
+func TestConvert(t *testing.T) {
+	args := Arguments{
+		Server:          "https://uyuni.com",
+		Username:        "exampleuser",
+		Password:        "examplepassword",
+		RefreshInterval: 1 * time.Minute,
+		EnableHTTP2:     true,
+		FollowRedirects: true,
+	}
+	require.NoError(t, args.Validate())
+
+	converted := args.Convert()
+	require.Equal(t, "https://uyuni.com", converted.Server)
+	require.Equal(t, "exampleuser", converted.Username)
+	require.Equal(t, promcfg.Secret("examplepassword"), converted.Password)
+	require.Equal(t, model.Duration(1*time.Minute), converted.RefreshInterval)
+	require.Equal(t, promcfg.DefaultHTTPClientConfig, converted.HTTPClientConfig)
+}

docs/sources/flow/reference/components/discovery.uyuni.md

@@ -0,0 +1,120 @@
+---
+canonical: https://grafana.com/docs/agent/latest/flow/reference/components/discovery.uyuni/
+title: discovery.uyuni
+---
+
+# discovery.uyuni
+
+`discovery.uyuni` discovers [Uyuni][] Monitoring Endpoints and exposes them as targets.
+
+[Uyuni]: https://www.uyuni-project.org/
+
+## Usage
+
+```river
+discovery.uyuni "LABEL" {
+    server   = SERVER
+    username = USERNAME
+    password = PASSWORD
+}
+```
+
+## Arguments
+
+The following arguments are supported:
+
+Name                  | Type       | Description                                                            | Default                  | Required
+--------------------- | ---------- | ---------------------------------------------------------------------- | ------------------------ | --------
+`server`              | `string`   | The primary Uyuni Server.                                              |                          | yes
+`username`            | `string`   | The username to use for authentication to the Uyuni API.               |                          | yes
+`password`            | `Secret`   | The password to use for authentication to the Uyuni API.               |                          | yes
+`entitlement`         | `string`   | The entitlement to filter on when listing targets.                     | `"monitoring_entitled"`  | no
+`separator`           | `string`   | The separator to use when building the `__meta_uyuni_groups` label.    | `","`                    | no
+`refresh_interval`    | `duration` | Interval at which to refresh the list of targets.                      | `1m`                     | no
+`proxy_url`           | `string`   | HTTP proxy to proxy requests through.                                  |                          | no
+`follow_redirects`    | `bool`     | Whether redirects returned by the server should be followed.           | `true`                   | no
+`enable_http2`        | `bool`     | Whether HTTP2 is supported for requests.                               | `true`                   | no
+
+
+## Blocks
+The following blocks are supported inside the definition of
+`discovery.uyuni`:
+
+Hierarchy | Block | Description | Required
+--------- | ----- | ----------- | --------
+tls_config | [tls_config][] | TLS configuration for requests to the Uyuni API. | no
+
+[tls_config]: #tls_config-block
+
+### tls_config block
+
+{{< docs/shared lookup="flow/reference/components/tls-config-block.md" source="agent" >}}
+
+## Exported fields
+
+The following fields are exported and can be referenced by other components:
+
+Name      | Type                | Description
+--------- | ------------------- | -----------
+`targets` | `list(map(string))` | The set of targets discovered from the Uyuni API.
+
+Each target includes the following labels:
+
+* `__meta_uyuni_minion_hostname`: The hostname of the Uyuni Minion.
+* `__meta_uyuni_primary_fqdn`: The FQDN of the Uyuni primary.
+* `__meta_uyuni_system_id`: The system ID of the Uyuni Minion.
+* `__meta_uyuni_groups`: The groups the Uyuni Minion belongs to.
+* `__meta_uyuni_endpoint_name`: The name of the endpoint.
+* `__meta_uyuni_exporter`: The name of the exporter.
+* `__meta_uyuni_proxy_module`: The name of the Uyuni module.
+* `__meta_uyuni_metrics_path`: The path to the metrics endpoint.
+* `__meta_uyuni_scheme`: `https` if TLS is enabled on the endpoint, `http` otherwise.
+
+These labels are largely derived from a [listEndpoints](https://www.uyuni-project.org/uyuni-docs-api/uyuni/api/system.monitoring.html)
+API call to the Uyuni Server.
+
+## Component health
+
+`discovery.uyuni` is only reported as unhealthy when given an invalid
+configuration. In those cases, exported fields retain their last healthy
+values.
+
+## Debug information
+
+`discovery.uyuni` does not expose any component-specific debug information.
+
+### Debug metrics
+
+`discovery.uyuni` does not expose any component-specific debug metrics.
+
+## Example
+
+```river
+discovery.uyuni "example" {
+  server    = "https://127.0.0.1/rpc/api"
+  username  = UYUNI_USERNAME
+  password  = UYUNI_PASSWORD
+}
+
+prometheus.scrape "demo" {
+  targets    = discovery.uyuni.example.targets
+  forward_to = [prometheus.remote_write.demo.receiver]
+}
+
+prometheus.remote_write "demo" {
+  endpoint {
+    url = PROMETHEUS_REMOTE_WRITE_URL
+
+    basic_auth {
+      username = USERNAME
+      password = PASSWORD
+    }
+  }
+}
+```
+Replace the following:
+  - `UYUNI_USERNAME`: The username to use for authentication to the Uyuni server.
+  - `UYUNI_PASSWORD`: The password to use for authentication to the Uyuni server.
+  - `PROMETHEUS_REMOTE_WRITE_URL`: The URL of the Prometheus remote_write-compatible server to send metrics to.
+  - `USERNAME`: The username to use for authentication to the remote_write API.
+  - `PASSWORD`: The password to use for authentication to the remote_write API.