implemented spawning of new agents

split pipeline

.woodpecker.yml

@@ -1,65 +0,0 @@
-steps:
-  test:
-    image: golang:1.21
-    commands:
-      - go test ./...
-    when:
-      - event: pull_request
-      - event: push
-        branch: main
-      - event: tag
-  pr-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: pull_request
-  pre-release:
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      platforms: linux/arm64/v8
-      repo: lerentis/metallb-ip-floater
-      tags:
-        - latest
-        - ${CI_COMMIT_SHA}
-      password:
-        from_secret: docker_hub_password
-      username:
-        from_secret: docker_hub_username
-    when:
-      - event: push
-        branch: main
-  release:
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      platforms: linux/arm64/v8
-      repo: lerentis/metallb-ip-floater
-      tags:
-        - latest
-        - ${CI_COMMIT_TAG}
-      password:
-        from_secret: docker_hub_password
-      username:
-        from_secret: docker_hub_username
-    when:
-      - event: tag
-  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:
-      - event: pull_request
-      - event: push
-        branch: main
-      - event: tag
-      - status: success
-      - status: failure

.woodpecker/main.yml

@@ -0,0 +1,29 @@
+when:
+  - event: push
+    branch: main
+
+steps:
+  test:
+    image: golang:1.21
+    commands:
+      - go test ./...
+  pre-release:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/arm64/v8
+      repo: lerentis/metallb-ip-floater
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA}
+      password:
+        from_secret: docker_hub_password
+      username:
+        from_secret: docker_hub_username
+  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

.woodpecker/pr.yml

@@ -0,0 +1,25 @@
+when:
+  - event: pull_request
+
+steps:
+  test:
+    image: golang:1.21
+    commands:
+      - go test ./...
+  pr-build:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/arm64/v8
+      repo: lerentis/metallb-ip-floater
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA}
+      dry-run: true
+  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

.woodpecker/release.yml

@@ -0,0 +1,28 @@
+when:
+  - event: tag
+
+steps:
+  test:
+    image: golang:1.21
+    commands:
+      - go test ./...
+  release:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/arm64/v8
+      repo: lerentis/metallb-ip-floater
+      tags:
+        - latest
+        - ${CI_COMMIT_TAG}
+      password:
+        from_secret: docker_hub_password
+      username:
+        from_secret: docker_hub_username
+  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

cmd/woodpecker-autoscaler.go

@@ -6,8 +6,10 @@ import (
 
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/health"
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/hetzner"
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/logging"
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/woodpecker"
+	"github.com/hetznercloud/hcloud-go/hcloud"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -34,7 +36,52 @@ func main() {
 	}).Info("Entering main event loop")
 
 	for {
-		woodpecker.CheckPending(cfg)
+		pendingTasks, err := woodpecker.CheckPending(cfg)
+		if err != nil {
+			log.WithFields(log.Fields{
+				"Caller": "Main",
+			}).Fatal(fmt.Sprintf("Error checking woodpecker queue: %s", err.Error()))
+		}
+		if pendingTasks {
+			server, err := hetzner.CreateNewAgent(cfg)
+			if err != nil {
+				log.WithFields(log.Fields{
+					"Caller": "Main",
+				}).Fatal(fmt.Sprintf("Error spawning new agent: %s", err.Error()))
+			}
+			for {
+				if server.Status == hcloud.ServerStatusRunning {
+					log.WithFields(log.Fields{
+						"Caller": "Main",
+					}).Infof("%s started!", server.Name)
+					break
+				}
+				log.WithFields(log.Fields{
+					"Caller": "Main",
+				}).Infof("Waiting for agent %s to start", server.Name)
+			}
+		} else {
+			log.WithFields(log.Fields{
+				"Caller": "Main",
+			}).Info("Checking if agents can be removed")
+			runningTasks, err := woodpecker.CheckRunning(cfg)
+			if err != nil {
+				log.WithFields(log.Fields{
+					"Caller": "Main",
+				}).Fatal(fmt.Sprintf("Error checking woodpecker queue: %s", err.Error()))
+			}
+			if runningTasks {
+				log.WithFields(log.Fields{
+					"Caller": "Main",
+				}).Info("Still found running tasks. No agent to be removed")
+			} else {
+				log.WithFields(log.Fields{
+					"Caller": "Main",
+				}).Info("No tasks running. Will remove agents")
+				// TODO: iterate over agents and remove ours
+				// agent name should match hetzner name
+			}
+		}
 		time.Sleep(time.Duration(cfg.CheckInterval) * time.Minute)
 	}
 }

go.mod

@@ -4,12 +4,26 @@ go 1.21.1
 
 require (
 	github.com/gorilla/mux v1.8.0
+	github.com/hetznercloud/hcloud-go v1.52.0
 	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
+	github.com/beorn7/perks v1.0.1 // indirect
-	gopkg.in/yaml.v2 v2.2.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/prometheus/client_golang v1.16.0 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.10.1 // indirect
+	github.com/rogpeppe/go-internal v1.11.0 // indirect
+	golang.org/x/net v0.12.0 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+	golang.org/x/text v0.11.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -1,24 +1,70 @@
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 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/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
+github.com/hetznercloud/hcloud-go v1.52.0 h1:3r9pEulTOBB9BoArSgpQYUQVTy+Xjkg0k/QAU4c6dQ8=
+github.com/hetznercloud/hcloud-go v1.52.0/go.mod h1:VzDWThl47lOnZXY0q5/LPFD+M62pfe/52TV+mOrpp9Q=
 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/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
+github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
 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/prometheus/client_golang v1.16.0 h1:yk/hx9hDbrGHovbci4BY+pRMfSuuat626eFsHb7tmT8=
+github.com/prometheus/client_golang v1.16.0/go.mod h1:Zsulrv/L9oM40tJ7T815tM89lFEugiJ9HzIqaAx4LKc=
+github.com/prometheus/client_model v0.3.0 h1:UBgGFHqYdG/TPFD1B1ogZywDqEkwp3fBMvqdiQ7Xew4=
+github.com/prometheus/client_model v0.3.0/go.mod h1:LDGWKZIo7rky3hgvBe+caln+Dr3dPggB5dvjtD7w9+w=
+github.com/prometheus/common v0.42.0 h1:EKsfXEYo4JpWMHH5cg+KOUWeuJSov1Id8zGR8eeI1YM=
+github.com/prometheus/common v0.42.0/go.mod h1:xBwqVerjNdUDjgODMpudtOMwlOwf2SaTr1yjz4b7Zbc=
+github.com/prometheus/procfs v0.10.1 h1:kYK1Va/YMlutzCGazswoHKo//tZVlFpKYh+PymziUAg=
+github.com/prometheus/procfs v0.10.1/go.mod h1:nwNm2aOCAYw8uTR/9bWRREkZFxAUcWzPHWJq+XBB/FM=
+github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
+github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
 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=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/net v0.12.0 h1:cfawfvKITfUsFCeJIHJrbSxpeu/E81khclypR0GVT50=
+golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 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=
+golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
+golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 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/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 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.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/config/config.go

@@ -18,7 +18,8 @@ type Config = struct {
 	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"`
+	Region                string `default:"" env:"WOODPECKER_AUTOSCALER_REGION"`
+	Datacenter            string `default:"" env:"WOODPECKER_AUTOSCALER_DATACENTER"`
 	DryRun                bool   `default:"false" env:"WOODPECKER_AUTOSCALER_DRY_RUN"`
 	SSHKey                string `default:"" env:"WOODPECKER_AUTOSCALER_SSH_KEY"`
 }

internal/hetzner/hetzneragent.go

@@ -2,11 +2,16 @@ package hetzner
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"text/template"
 
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/utils"
+	"github.com/hetznercloud/hcloud-go/hcloud"
+
+	log "github.com/sirupsen/logrus"
 )
 
 var USER_DATA_TEMPLATE = `
@@ -37,11 +42,12 @@ type UserDataConfig struct {
 	EnvConfig map[string]string
 }
 
-func generateConfig(cfg *config.Config) (string, error) {
+func generateConfig(cfg *config.Config, name string) (string, error) {
 	envConfig := map[string]string{}
 	envConfig["WOODPECKER_SERVER"] = cfg.WoodpeckerInstance
 	envConfig["WOODPECKER_AGENT_SECRET"] = cfg.WoodpeckerAgentSecret
 	envConfig["WOODPECKER_FILTER_LABELS"] = cfg.LabelSelector
+	envConfig["WOODPECKER_HOSTNAME"] = name
 	config := UserDataConfig{
 		Image:     "woodpeckerci/woodpecker-agent:latest",
 		EnvConfig: envConfig,
@@ -55,6 +61,66 @@ func generateConfig(cfg *config.Config) (string, error) {
 	if err != nil {
 		return "", errors.New(fmt.Sprintf("Could not render userdata template: %s", err.Error()))
 	}
-
 	return buf.String(), nil
 }
+
+func CreateNewAgent(cfg *config.Config) (*hcloud.Server, error) {
+	client := hcloud.NewClient(hcloud.WithToken(cfg.HcloudToken))
+	name := fmt.Sprintf("woodpecker-autoscaler-agent-%s", utils.RandStringBytes(5))
+	userdata, err := generateConfig(cfg, name)
+	img, _, err := client.Image.GetByNameAndArchitecture(context.Background(), "docker", "amd64")
+	loc, _, err := client.Location.GetByName(context.Background(), cfg.Region)
+	pln, _, err := client.ServerType.GetByName(context.Background(), cfg.InstanceType)
+	key, _, err := client.SSHKey.GetByName(context.Background(), cfg.SSHKey)
+	dc, _, err := client.Datacenter.GetByName(context.Background(), cfg.Datacenter)
+	labels := map[string]string{}
+	labels["Role"] = "WoodpeckerAgent"
+	labels["ControledBy"] = "WoodpeckerAutoscaler"
+
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Could not create new Agent: %s", err.Error()))
+	}
+
+	res, _, err := client.Server.Create(context.Background(), hcloud.ServerCreateOpts{
+		Name:             name,
+		ServerType:       pln,
+		Image:            img,
+		SSHKeys:          []*hcloud.SSHKey{key},
+		Location:         loc,
+		Datacenter:       dc,
+		UserData:         userdata,
+		StartAfterCreate: utils.BoolPointer(true),
+		Labels:           labels,
+	})
+
+	log.WithFields(log.Fields{
+		"Caller": "CreateNewAgent",
+	}).Infof("Created new Build Agent %s", res.Server.Name)
+
+	return res.Server, nil
+}
+
+func ListAgents(cfg *config.Config) ([]hcloud.Server, error) {
+	client := hcloud.NewClient(hcloud.WithToken(cfg.HcloudToken))
+	allServers, err := client.Server.All(context.Background())
+	if err != nil {
+		return nil, errors.New(fmt.Sprintf("Could not query Server list: %s", err.Error()))
+	}
+	myServers := []hcloud.Server{}
+	for _, server := range allServers {
+		val, exists := server.Labels["ControledBy"]
+		if exists && val == "WoodpeckerAutoscaler" {
+			myServers = append(myServers, *server)
+		}
+	}
+	return myServers, nil
+}
+
+func DecomAgent(cfg *config.Config, server *hcloud.Server) error {
+	client := hcloud.NewClient(hcloud.WithToken(cfg.HcloudToken))
+	_, _, err := client.Server.DeleteWithResult(context.Background(), server)
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not delete Agent: %s", err.Error()))
+	}
+	return nil
+}

internal/models/structs.go

@@ -54,3 +54,39 @@ type QueueInfo struct {
 	Stats         Stats                `json:"stats"`
 	Paused        bool                 `json:"paused"`
 }
+
+/*[
+  {
+    "id": 2,
+    "created": 1693567407,
+    "updated": 1694013270,
+    "name": "",
+    "owner_id": -1,
+    "token": "redacted",
+    "last_contact": 1694013270,
+    "platform": "linux/arm64",
+    "backend": "kubernetes",
+    "capacity": 4,
+    "version": "next-971534929c",
+    "no_schedule": false
+  }
+]*/
+
+type Agent struct {
+	ID          int64  `json:"id"`
+	Created     int64  `json:"created"`
+	Updated     int64  `json:"updated"`
+	Name        string `json:"name"`
+	OwnerID     int64  `json:"owner_id"`
+	Token       string `json:"token"`
+	LastContact int64  `json:"last_contact"`
+	Platform    string `json:"platform"`
+	Backend     string `json:"backend"`
+	Capacity    int32  `json:"capacity"`
+	Version     string `json:"version"`
+	NoSchedule  bool   `json:"no_schedule"`
+}
+
+type AgentList struct {
+	Agents []Agent
+}

internal/utils/utils.go

@@ -0,0 +1,17 @@
+package utils
+
+import "math/rand"
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+func RandStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}
+
+func BoolPointer(b bool) *bool {
+	return &b
+}

internal/woodpecker/agent.go

@@ -0,0 +1,60 @@
+package woodpecker
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
+	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/models"
+)
+
+func DecomAgent(cfg *config.Config, agentId int) error {
+	apiRoute := fmt.Sprintf("%s/api/agents/%d", cfg.WoodpeckerInstance, agentId)
+	req, err := http.NewRequest("DELETE", apiRoute, nil)
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not create delete request: %s", err.Error()))
+	}
+	req.Header.Set("Accept", "text/plain")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", cfg.WoodpeckerApiToken))
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not delete agent: %s", err.Error()))
+	}
+	defer resp.Body.Close()
+	return nil
+}
+
+func GetAgentIdByName(cfg *config.Config, name string) (int, error) {
+	apiRoute := fmt.Sprintf("%s/api/agents?page=1&perPage=100", cfg.WoodpeckerInstance)
+	req, err := http.NewRequest("GET", apiRoute, nil)
+	if err != nil {
+		return 0, errors.New(fmt.Sprintf("Could not create agent query request: %s", err.Error()))
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", cfg.WoodpeckerApiToken))
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return 0, errors.New(fmt.Sprintf("Could not query agent list: %s", err.Error()))
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return 0, errors.New(fmt.Sprintf("Invalid status code from API: %d", resp.StatusCode))
+	}
+	agentList := new(models.AgentList)
+	err = json.NewDecoder(resp.Body).Decode(agentList)
+	if err != nil {
+		return 0, errors.New(fmt.Sprintf("Could not unmarshal api response: %s", err.Error()))
+	}
+
+	for _, agent := range agentList.Agents {
+		if agent.Name == name {
+			return int(agent.ID), nil
+		}
+	}
+	return 0, errors.New(fmt.Sprintf("Agent with name %s is not in server", name))
+}

internal/woodpecker/metrics.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"strings"
 
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/config"
 	"git.uploadfilter24.eu/covidnetes/woodpecker-autoscaler/internal/models"
@@ -34,27 +35,43 @@ func QueueInfo(cfg *config.Config, target interface{}) error {
 	return json.NewDecoder(resp.Body).Decode(target)
 }
 
-func CheckPending(cfg *config.Config) error {
+func CheckPending(cfg *config.Config) (bool, error) {
+	expectedKV := strings.Split(cfg.LabelSelector, "=")
 	queueInfo := new(models.QueueInfo)
 	err := QueueInfo(cfg, queueInfo)
 	if err != nil {
-		return errors.New(fmt.Sprintf("Error from QueueInfo: %s", err.Error()))
+		return false, errors.New(fmt.Sprintf("Error from QueueInfo: %s", err.Error()))
 	}
 	if queueInfo.Stats.PendingCount > 0 {
-		// TODO: queueInfo.Pending may be empty
+		if queueInfo.Pending != nil {
 			for _, pendingJobs := range queueInfo.Pending {
-			// TODO: separate key and value from LabelSelector and compare them deeply
+				val, exists := pendingJobs.Labels[expectedKV[0]]
-			_, exists := pendingJobs.Labels[cfg.LabelSelector]
+				if exists && val == expectedKV[1] {
-			if exists {
 					log.WithFields(log.Fields{
 						"Caller": "CheckPending",
-				}).Info("Found pending job for us. Requesting new Agent")
+					}).Info("Found pending job for us")
+					return true, nil
 				} else {
 					log.WithFields(log.Fields{
 						"Caller": "CheckPending",
 					}).Info("No Jobs for us in Queue")
+					return false, nil
 				}
 			}
 		}
-	return nil
+	}
+	return false, nil
+}
+
+func CheckRunning(cfg *config.Config) (bool, error) {
+	queueInfo := new(models.QueueInfo)
+	err := QueueInfo(cfg, queueInfo)
+	if err != nil {
+		return false, errors.New(fmt.Sprintf("Error from QueueInfo: %s", err.Error()))
+	}
+	// TODO: create and parse running object. there may be jobs that are not for us
+	if queueInfo.Stats.RunningCount > 0 {
+		return true, nil
+	}
+	return false, nil
 }