K8s list deployments (#921)

* Outline of ListDeployments method

* Added implementation of DeploymentList

runtime/kubernetes/client/api/request.go

@@ -103,7 +103,7 @@ func (r *Request) Body(in interface{}) *Request {
 // Params isused to set paramters on a request
 func (r *Request) Params(p *Params) *Request {
 	for k, v := range p.LabelSelector {
-		r.params.Add("labelSelectors", k+"="+v)
+		r.params.Add("labelSelector", k+"="+v)
 	}
 
 	return r

runtime/kubernetes/client/client.go

@@ -90,7 +90,7 @@ func detectNamespace() (string, error) {
 	}
 }
 
-// UpdateDeployment
+// UpdateDeployment patches kubernetes deployment with metadata provided in body
 func (c *client) UpdateDeployment(name string, body interface{}) error {
 	return api.NewRequest(c.opts).
 		Patch().
@@ -100,3 +100,16 @@ func (c *client) UpdateDeployment(name string, body interface{}) error {
 		Do().
 		Error()
 }
+
+// ListDeployments lists all kubernetes deployments with given labels
+func (c *client) ListDeployments(labels map[string]string) (*DeploymentList, error) {
+	var deployments DeploymentList
+	err := api.NewRequest(c.opts).
+		Get().
+		Resource("deployments").
+		Params(&api.Params{LabelSelector: labels}).
+		Do().
+		Into(&deployments)
+
+	return &deployments, err
+}

runtime/kubernetes/client/kubernetes.go

@@ -4,9 +4,30 @@ package client
 type Kubernetes interface {
 	// UpdateDeployment patches deployment annotations with new metadata
 	UpdateDeployment(string, interface{}) error
+	// ListDeployments lists all micro deployments
+	ListDeployments(labels map[string]string) (*DeploymentList, error)
 }
 
 // Metadata defines api request metadata
 type Metadata struct {
+	Name        string            `json:"name,omitempty"`
+	Labels      map[string]string `json:"labels,omitempty"`
 	Annotations map[string]string `json:"annotations,omitempty"`
 }
+
+// DeploymentList
+type DeploymentList struct {
+	Items []Deployment `json:"items"`
+}
+
+// Deployment is Kubernetes deployment
+type Deployment struct {
+	Metadata *Metadata `json:"metadata"`
+	Status   *Status   `json:"status"`
+}
+
+// Status is Kubernetes deployment status
+type Status struct {
+	Replicas          int `json:"replicas"`
+	AvailableReplicas int `json:"availablereplicas"`
+}