Fix labels

.gitea/workflows/build.yml

@@ -23,11 +23,6 @@ jobs:
       with:
         go-version: '1.23'
 
-    # - name: Install dependencies
-    #   run: |
-    #     sudo apt-get update
-    #     sudo apt-get install -y task
-
     - name: Run tests
       run: task test
 
@@ -35,16 +30,6 @@ jobs:
       run: |
         task build VERSION=${{ github.event.inputs.version }}
 
-    # - name: Upload Release Asset
-    #   uses: actions/upload-release-asset@v1
-    #   env:
-    #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    #   with:
-    #     upload_url: ${{ github.event.release.upload_url }}
-    #     asset_path: ./lobby2-${{ github.ref_name }}-amd64
-    #     asset_name: lobby2-${{ github.ref_name }}-amd64
-    #     asset_content_type: application/octet-stream
-
     - uses: actions/forgejo-release@v2
       with:
         token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,3 +1,5 @@
 tmp/
 __debug*
 main
+bin/
+nodes.json

.vscode/launch.json

@@ -29,7 +29,7 @@
             "env": {
                 "DUMP_PATH": "../tmp/nodes.json",
                 "CONFIG_PATH": "../tmp/config.json",
-                "NODE_DIR_PATH": "../tmp/node"
+                "NODE_PATH": "../tmp/node.json"
             },
             "args": [
                 "node"

Taskfile.yml

@@ -19,4 +19,9 @@ tasks:
     cmds:
     - go mod tidy
     - mkdir -p bin
-    - go build -o bin/lobby2-{{ .VERSION }}-amd64 cli/*.go
+    - env CGO_ENABLED=0 go build -o bin/lobby2-{{ .VERSION }}-linux-amd64 cli/*.go
+  deploy:
+    cmds:
+    - task: build
+    - scp bin/lobby2-{{ .VERSION }}-linux-amd64 rosti-db:/usr/local/bin/lobby2.tmp
+    - ssh rosti-db mv /usr/local/bin/lobby2.tmp /usr/local/bin/lobby2

api/main.go

@@ -53,6 +53,7 @@ func (a *API) Run() error {
 	a.e.GET("/nodes", a.listHandler)
 	a.e.GET("/nodes/:hostname", a.getHandler)
 	a.e.POST("/nodes/:hostname", a.refreshHandler)
+	a.e.GET("/prometheus/:service", a.prometheusHandler)
 
 	// Start the server in a goroutine so that it doesn't block the signal listening
 	return a.e.Start(a.listen)
@@ -111,3 +112,18 @@ func (a *API) refreshHandler(c echo.Context) error {
 
 	return c.NoContent(http.StatusNoContent)
 }
+
+// @Summary Prometheus service discovery
+// @Description Return one nodes based on given hostname
+// @Produce  application/json
+// @Success 200 {array} []prometheusDiscovery "Node details"
+// @Failure 401 {object} Message "Forbidden access"
+// @Security Bearer
+// @Router /prometheus/{service} [get]
+func (a *API) prometheusHandler(c echo.Context) error {
+	ss := c.Param("service")
+
+	pds := nodes.GetPrometheusSD(a.np, ss)
+
+	return c.JSONPretty(http.StatusOK, pds, "  ")
+}

cli/actions.go

@@ -28,7 +28,7 @@ func masterAction(c *cli.Context) error {
 func nodeAction(c *cli.Context) error {
 	cfg := GetConfig()
 
-	r := refresher.NewRefresher(cfg.NodeDirPath, cfg.ConfigPath)
+	r := refresher.NewRefresher(cfg.NodePath, cfg.ConfigPath)
 	r.Loop()
 
 	return nil
@@ -52,3 +52,23 @@ func printAction(c *cli.Context) error {
 
 	return nil
 }
+
+func prometheusAction(c *cli.Context) error {
+	cfg := GetConfig()
+
+	np := nodes.NewNodesProcessor(cfg.DumpPath, cfg.DropAfterSeconds)
+
+	pds := nodes.GetPrometheusSD(np, "node")
+
+	for _, pd := range pds {
+		body, err := json.MarshalIndent(pd, "", "  ")
+		if err != nil {
+			fmt.Printf("failed to marshal prometheus discovery: %v\n", err)
+			os.Exit(1)
+		}
+
+		fmt.Println(string(body))
+	}
+
+	return nil
+}

cli/config.go

@@ -10,9 +10,9 @@ type Config struct {
 	APIListen string `envconfig:"LISTEN" default:"0.0.0.0:1352"`
 	APIToken  string `envconfig:"TOKEN" default:""`
 
-	DumpPath    string `envconfig:"DUMP_PATH" default:"/var/lib/lobby2/nodes.json"`
-	ConfigPath  string `envconfig:"CONFIG_PATH" default:"/var/lib/lobby2/config.json"`
-	NodeDirPath string `envconfig:"NODE_DIR_PATH" default:"/var/lib/lobby2/node"`
+	DumpPath   string `envconfig:"DUMP_PATH" default:"/var/lib/lobby2/nodes.json"`
+	ConfigPath string `envconfig:"CONFIG_PATH" default:"/etc/lobby2/config.json"`
+	NodePath   string `envconfig:"NODE_PATH" default:"/etc/lobby2/node.json"`
 
 	DropAfterSeconds int64 `envconfig:"DROP_AFTER_SECONDS" default:"60"`
 }

cli/main.go

@@ -27,6 +27,11 @@ func main() {
 				Usage:  "Prints all discovered nodes",
 				Action: printAction,
 			},
+			{
+				Name:   "prometheus",
+				Usage:  "Prints Prometheus Service Discovery",
+				Action: prometheusAction,
+			},
 		},
 	}
 

nodes/prometheus.go

@@ -0,0 +1,45 @@
+package nodes
+
+import (
+	"fmt"
+	"strings"
+)
+
+type prometheusDiscovery struct {
+	Labels  map[string]string `json:"Labels"`
+	Targets []string          `json:"Targets"`
+}
+
+func GetPrometheusSD(p *NodesProcessor, ss string) []prometheusDiscovery {
+	ns := p.List()
+
+	pds := []prometheusDiscovery{
+		{
+			Labels:  make(map[string]string),
+			Targets: []string{},
+		},
+	}
+
+	for _, node := range ns {
+		port, ok := node.KV["prometheus_port"]
+		if !ok {
+			port = "9999"
+		}
+		host, ok := node.KV["prometheus_host"]
+		if !ok {
+			host = node.HostName
+		}
+
+		v, ok := node.KV["prometheus_exporters"]
+		if ok {
+			services := strings.Split(v, ",")
+			for _, service := range services {
+				if ss == service {
+					pds[0].Targets = append(pds[0].Targets, fmt.Sprintf("%s:%s", host, port))
+				}
+			}
+		}
+	}
+
+	return pds
+}

refresher/main.go

@@ -7,25 +7,24 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"path"
+	"path/filepath"
 	"time"
 
 	"gitea.ceperka.net/rosti/lobby2/nodes"
 )
 
 const refreshIntervalSeconds = 15
-const nodeFileName = "node.json"
 
 // Refresher loads local node info and sends them to the master node.
 type Refresher struct {
-	configPath  string
-	nodeDirPath string
+	configPath string
+	nodePath   string
 }
 
-func NewRefresher(nodeDirPath string, configPath string) *Refresher {
+func NewRefresher(nodePath string, configPath string) *Refresher {
 	return &Refresher{
-		nodeDirPath: nodeDirPath,
-		configPath:  configPath,
+		nodePath:   nodePath,
+		configPath: configPath,
 	}
 }
 
@@ -113,7 +112,7 @@ func (r *Refresher) getConfig() (NodeConfig, error) {
 
 // TODO: rewrite this to load Node structure
 func (r *Refresher) loadNode() (*nodes.Node, error) {
-	filePath := path.Join(r.nodeDirPath, nodeFileName)
+	filePath := r.nodePath
 	_, err := os.Stat(filePath)
 	if os.IsNotExist(err) {
 		err = r.initNodeFile()
@@ -122,7 +121,7 @@ func (r *Refresher) loadNode() (*nodes.Node, error) {
 		}
 	}
 
-	content, err := os.ReadFile(path.Join(r.nodeDirPath, nodeFileName))
+	content, err := os.ReadFile(r.nodePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read file: %w", err)
 	}
@@ -156,7 +155,7 @@ func (r *Refresher) initNodeFile() error {
 		return fmt.Errorf("failed to marshal node: %w", err)
 	}
 
-	err = os.WriteFile(path.Join(r.nodeDirPath, nodeFileName), nodeBytes, 0640)
+	err = os.WriteFile(r.nodePath, nodeBytes, 0640)
 	if err != nil {
 		return fmt.Errorf("failed to write node file: %w", err)
 	}
@@ -165,9 +164,11 @@ func (r *Refresher) initNodeFile() error {
 }
 
 func (r *Refresher) createNodePath() error {
-	_, err := os.Stat(r.nodeDirPath)
+	d := filepath.Dir(r.nodePath)
+
+	_, err := os.Stat(d)
 	if os.IsNotExist(err) {
-		err = os.MkdirAll(r.nodeDirPath, 0755)
+		err = os.MkdirAll(d, 0755)
 		if err != nil {
 			return fmt.Errorf("failed to create node dir: %w", err)
 		}