akeleton config and launch template

.woodpecker.yml

@@ -0,0 +1,37 @@
+steps:
+  test:
+    image: golang:1.21
+    commands:
+      - go test ./...
+    when:
+      event:
+        - push
+        - pull_request
+  build:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/arm64/v8
+      repo: lerentis/metallb-ip-floater
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA}
+      dry-run: true
+    when:
+      event:
+        - push
+        - pull_request
+  notify:
+    image: appleboy/drone-telegram
+    settings:
+      message: "Commit {{ commit.message }} ({{ commit.link }}) ran with build {{ build.number }} and finished with status {{ build.status }}."
+      to: 
+        from_secret: telegram_userid
+      token:
+        from_secret: telegram_secret
+    when:
+      status:
+      - failure
+      - success
+      event:
+      - push
+      - pull_request

Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.21 as build
+
+WORKDIR /app
+
+COPY . .
+
+RUN go mod tidy && CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w -extldflags "-static"' -o woodpecker-autoscaler ./cmd/
+
+FROM scratch
+
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=build /etc/passwd /etc/passwd
+COPY --from=build /etc/group /etc/group
+COPY --from=build --chown=65534:65534 /app/woodpecker-autoscaler /usr/local/bin/woodpecker-autoscaler
+
+USER nobody
+
+ENTRYPOINT ["/usr/local/bin/woodpecker-autoscaler"]

cmd/woodpecker-autoscaler.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/health"
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/logging"
+	log "github.com/sirupsen/logrus"
+)
+
+func main() {
+
+	cfg, err := config.GenConfig()
+	logging.ConfigureLogger(cfg)
+
+	if err != nil {
+		log.WithFields(log.Fields{
+			"Caller": "Main",
+		}).Fatal(fmt.Sprintf("Error generating Config: %s", err.Error()))
+	}
+
+	go func() {
+		log.WithFields(log.Fields{
+			"Caller": "Main",
+		}).Info("Starting Health Endpoint")
+		health.StartHealthEndpoint()
+	}()
+
+	log.WithFields(log.Fields{
+		"Caller": "Main",
+	}).Info("Entering main event loop")
+
+	for {
+		time.Sleep(time.Duration(cfg.CheckInterval) * time.Minute)
+	}
+}

go.mod

@@ -0,0 +1,15 @@
+module git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler
+
+go 1.21.1
+
+require (
+	github.com/gorilla/mux v1.8.0
+	github.com/jinzhu/configor v1.2.1
+	github.com/sirupsen/logrus v1.9.3
+)
+
+require (
+	github.com/BurntSushi/toml v0.3.1 // indirect
+	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+	gopkg.in/yaml.v2 v2.2.2 // indirect
+)

go.sum

@@ -0,0 +1,24 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
+github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
+github.com/jinzhu/configor v1.2.1 h1:OKk9dsR8i6HPOCZR8BcMtcEImAFjIhbJFZNyn5GCZko=
+github.com/jinzhu/configor v1.2.1/go.mod h1:nX89/MOmDba7ZX7GCyU/VIaQ2Ar2aizBl2d3JLF/rDc=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/config/config.go

@@ -0,0 +1,38 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/jinzhu/configor"
+)
+
+type Config = struct {
+	LogLevel              string `default:"Info" env:"WOODPECKER_AUTOSCALER_LOGLEVEL"`
+	CheckInterval         int    `default:"15" env:"WOODPECKER_AUTOSCALER_CHECK_INTERVAL"`
+	LabelSelector         string `default:"uploadfilter24.eu/instance-role=Woodpecker" env:"WOODPECKER_AUTOSCALER_LABELSELECTOR"`
+	WoodpeckerInstance    string `default:"" env:"WOODPECKER_AUTOSCALER_WOODPECKER_INSTANCE"`
+	WoodpeckerAgentSecret string `default:"" env:"WOODPECKER_AUTOSCALER_WOODPECKER_AGENT_SECRET"`
+	Protocol              string `default:"http" env:"WOODPECKER_AUTOSCALER_PROTOCOL"`
+	HcloudToken           string `default:"" env:"WOODPECKER_AUTOSCALER_HCLOUD_TOKEN"`
+	InstanceType          string `default:"" env:"WOODPECKER_AUTOSCALER_INSTANCE_TYPE"`
+	Zone                  string `default:"" env:"WOODPECKER_AUTOSCALER_ZONE"`
+	DryRun                bool   `default:"false" env:"WOODPECKER_AUTOSCALER_DRY_RUN"`
+	SSHKey                string `default:"" env:"WOODPECKER_AUTOSCALER_SSH_KEY"`
+}
+
+func GenConfig() (cfg *Config, err error) {
+
+	cfg = &Config{}
+
+	err = configor.New(&configor.Config{
+		ENVPrefix:          "WOODPECKER_AUTOSCALER",
+		AutoReload:         true,
+		Silent:             true,
+		AutoReloadInterval: time.Minute}).Load(cfg, "config.json")
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Error generating Config: %s", err.Error()))
+	}
+	return cfg, nil
+}

internal/health/healthcheck.go

@@ -0,0 +1,31 @@
+package health
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	log "github.com/sirupsen/logrus"
+)
+
+func StartHealthEndpoint() {
+	r := mux.NewRouter()
+	r.Use(mux.CORSMethodMiddleware(r))
+	r.HandleFunc("/health", send200).Methods(http.MethodGet)
+	err := http.ListenAndServe("0.0.0.0:8080", r)
+	if err != nil {
+		log.WithFields(log.Fields{
+			"Caller": "StartHealthEndpoint",
+		}).Error(fmt.Sprintf("Error creating health endpoint: %s", err.Error()))
+	}
+}
+
+func send200(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	_, err := w.Write([]byte{})
+	if err != nil {
+		log.WithFields(log.Fields{
+			"Caller": "send200",
+		}).Error(fmt.Sprintf("Error answering health endpoint: %s", err.Error()))
+	}
+}

internal/hetzner/hetzneragent.go

@@ -0,0 +1,55 @@
+package hetzner
+
+import (
+	"os"
+	"text/template"
+
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+)
+
+var USER_DATA_TEMPLATE = `
+write_files:
+- content: |
+    # docker-compose.yml
+    version: '3'
+
+    services:
+
+      woodpecker-agent:
+        image: {{ .Image }}
+        command: agent
+        restart: always
+        volumes:
+          - /var/run/docker.sock:/var/run/docker.sock
+        environment:
+		{{- range $key, $val := .EnvConfig }}
+			- {{ $key }}: {{ $val }}
+	  	{{- end }}
+  path: /root/docker-compose.yml
+runcmd:
+- [ sh, -xc, "cd /root; docker run --rm --privileged multiarch/qemu-user-static --reset -p yes; docker compose up -d" ]
+`
+
+type UserDataConfig struct {
+	Image     string
+	EnvConfig map[string]string
+}
+
+func generateConfig(cfg *config.Config) {
+	envConfig := map[string]string{}
+	envConfig["WOODPECKER_SERVER"] = cfg.WoodpeckerInstance
+	envConfig["WOODPECKER_AGENT_SECRET"] = cfg.WoodpeckerAgentSecret
+	envConfig["WOODPECKER_FILTER_LABELS"] = cfg.LabelSelector
+	config := UserDataConfig{
+		Image:     "woodpeckerci/woodpecker-agent:latest",
+		EnvConfig: envConfig,
+	}
+	tmpl, err := template.New("test").Parse(USER_DATA_TEMPLATE)
+	if err != nil {
+		panic(err)
+	}
+	err = tmpl.Execute(os.Stdout, config)
+	if err != nil {
+		panic(err)
+	}
+}

internal/logging/logging.go

@@ -0,0 +1,28 @@
+package logging
+
+import (
+	"os"
+
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+	log "github.com/sirupsen/logrus"
+)
+
+func ConfigureLogger(cfg *config.Config) {
+
+	switch cfg.LogLevel {
+	case "Debug":
+		log.SetLevel(log.DebugLevel)
+	case "Info":
+		log.SetLevel(log.InfoLevel)
+	case "Warn":
+		log.SetLevel(log.WarnLevel)
+	case "Error":
+		log.SetLevel(log.ErrorLevel)
+	default:
+		log.SetLevel(log.InfoLevel)
+		log.Warnf("Home: invalid log level supplied: '%s'", cfg.LogLevel)
+	}
+
+	log.SetFormatter(&log.JSONFormatter{})
+	log.SetOutput(os.Stdout)
+}

internal/woodpecker/metrics.go

@@ -0,0 +1,7 @@
+package woodpecker
+
+import "git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+
+func GetPendingJobs(cfg *config.Config) {
+
+}