add remove agent API

kubernetes.go

@@ -10,7 +10,7 @@ import (
 	"k8s.io/client-go/rest"
 )
 
-func CreatePod(podname string) PodResponse {
+func CreatePod(podname, agentId string) PodResponse {
 	cs, err := getInClusterClientSet()
 	var response PodResponse
 	if err != nil {
@@ -28,6 +28,11 @@ func CreatePod(podname string) PodResponse {
 		return response
 	}
 
+	// Set the agentId as label if specified
+	if(agentId != "") {
+		p1.Labels["AgentId"] = agentId
+	}
+
 	podClient := cs.CoreV1().Pods("azuredevops")
 	pod, err2 := podClient.Create(&p1)
 	if err2 != nil {
@@ -43,7 +48,7 @@ func CreatePod(podname string) PodResponse {
 
 func DeletePod(podname string) PodResponse {
 	cs, err := getInClusterClientSet()
-	response := PodResponse {  "failure", "" }
+	response := PodResponse { "failure", "" }
 	if err != nil {
 		response.Message = err.Error()
 		return response
@@ -62,6 +67,34 @@ func DeletePod(podname string) PodResponse {
 	return response
 }
 
+func DeletePodWithAgentId(agentId string) PodResponse {
+	cs, err := getInClusterClientSet()
+	response := PodResponse { "failure", "" }
+	if err != nil {
+		response.Message = err.Error()
+		return response
+	}
+
+	podClient := cs.CoreV1().Pods("azuredevops")
+
+	// Get the pod with this agentId
+	pods, _ := podClient.List(metav1.ListOptions{LabelSelector: agentId})
+	if(pods == nil || len(pods.Items) == 0) {
+		response.Message = "Could not find running pod with AgentId" + agentId
+		return response
+	}
+
+	err2 := podClient.Delete(pods.Items[0].GetName(), &metav1.DeleteOptions{})
+	if err2 != nil {
+		response.Message = "podclient delete error: " + err2.Error()
+		return response
+	}
+
+	response.Status = "success"
+	response.Message = "Deleted " + pods.Items[0].GetName()
+	return response
+}
+
 func getInClusterClientSet() (*kubernetes.Clientset, error) {
 	config, err := rest.InClusterConfig()
 	if err != nil {

main.go

@@ -26,6 +26,7 @@ func main() {
 	s.HandleFunc("/delete", func(w http.ResponseWriter, r *http.Request) { KubernetesDeleteHandler(w, r) })
 	s.HandleFunc("/definitions", func(w http.ResponseWriter, r *http.Request) { EmptyResponeHandler(w, r) })
 	s.HandleFunc("/acquire", func(w http.ResponseWriter, r *http.Request) { AcquireAgentHandler(w, r) })
+	s.HandleFunc("/release", func(w http.ResponseWriter, r *http.Request) { ReleaseAgentHandler(w, r) })
 
 	// Test redis
 	s.HandleFunc("/testredisdata", StorageSetHandler(storage))
@@ -44,7 +45,9 @@ func KubernetesCreateHandler(resp http.ResponseWriter, req *http.Request) {
 		agentSpec = userSpec[0]
 	}
 
-	var pods = CreatePod(agentSpec)
+	// Create a new pod without an AgentId label
+	var pods = CreatePod(agentSpec, "")
+
 	WriteJsonResponse(resp, pods)
 }
 
@@ -54,8 +57,29 @@ func AcquireAgentHandler(resp http.ResponseWriter, req *http.Request) {
 		requestBody, _ := ioutil.ReadAll(req.Body)
 		json.Unmarshal(requestBody, &agentRequest)
 
-		var pods = CreatePod("")
+		if(agentRequest.AgentId == "") {
-	    WriteJsonResponse(resp, pods)
+			http.Error(resp, "No AgentId sent in request body.", http.StatusCreated)
+		}
+
+		var pods = CreatePod("", "")
+		WriteJsonResponse(resp, pods)
+	} else {
+		http.Error(resp, "Invalid request Method.", http.StatusMethodNotAllowed)
+	}
+}
+
+func ReleaseAgentHandler(resp http.ResponseWriter, req *http.Request) {
+	if(req.Method == "POST") {
+		var agentRequest ReleaseAgentRequest
+		requestBody, _ := ioutil.ReadAll(req.Body)
+		json.Unmarshal(requestBody, &agentRequest)
+
+		if(agentRequest.AgentId == "") {
+			http.Error(resp, "No AgentId sent in request body.", http.StatusCreated)
+		}
+
+		var pods = DeletePod(agentRequest.AgentId)
+		WriteJsonResponse(resp, pods)
 	} else {
 		http.Error(resp, "Invalid request Method.", http.StatusMethodNotAllowed)
 	}