Move api querier to own file

nomad/api_querier.go

@@ -0,0 +1,74 @@
+package nomad
+
+import (
+	nomadApi "github.com/hashicorp/nomad/api"
+	"net/url"
+)
+
+// nomadApiQuerier provides access to the Nomad functionality.
+type nomadApiQuerier interface {
+	// init prepares an apiClient to be able to communicate to a provided Nomad API.
+	init(nomadURL *url.URL) (err error)
+
+	// LoadJobList loads the list of jobs from the Nomad API.
+	LoadJobList() (list []*nomadApi.JobListStub, err error)
+
+	// GetJobScale returns the scale of the passed job.
+	GetJobScale(jobId string) (jobScale int, err error)
+
+	// SetJobScaling sets the scaling count of the passed job to Nomad.
+	SetJobScaling(jobId string, count int, reason string) (err error)
+
+	// DeleteRunner deletes the runner with the given Id.
+	DeleteRunner(runnerId string) (err error)
+
+	// loadRunners loads all allocations of the specified job.
+	loadRunners(jobId string) (allocationListStub []*nomadApi.AllocationListStub, err error)
+}
+
+// nomadApiClient implements the nomadApiQuerier interface and provides access to a real Nomad API.
+type nomadApiClient struct {
+	client *nomadApi.Client
+}
+
+func (nc *nomadApiClient) init(nomadURL *url.URL) (err error) {
+	nc.client, err = nomadApi.NewClient(&nomadApi.Config{
+		Address:   nomadURL.String(),
+		TLSConfig: &nomadApi.TLSConfig{},
+	})
+	return err
+}
+
+func (nc *nomadApiClient) LoadJobList() (list []*nomadApi.JobListStub, err error) {
+	list, _, err = nc.client.Jobs().List(nil)
+	return
+}
+
+func (nc *nomadApiClient) GetJobScale(jobId string) (jobScale int, err error) {
+	status, _, err := nc.client.Jobs().ScaleStatus(jobId, nil)
+	if err != nil {
+		return
+	}
+	// ToDo: Consider counting also the placed and desired allocations
+	jobScale = status.TaskGroups[jobId].Running
+	return
+}
+
+func (nc *nomadApiClient) SetJobScaling(jobId string, count int, reason string) (err error) {
+	_, _, err = nc.client.Jobs().Scale(jobId, jobId, &count, reason, false, nil, nil)
+	return
+}
+
+func (nc *nomadApiClient) DeleteRunner(runnerId string) (err error) {
+	allocation, _, err := nc.client.Allocations().Info(runnerId, nil)
+	if err != nil {
+		return
+	}
+	_, err = nc.client.Allocations().Stop(allocation, nil)
+	return err
+}
+
+func (nc *nomadApiClient) loadRunners(jobId string) (allocationListStub []*nomadApi.AllocationListStub, err error) {
+	allocationListStub, _, err = nc.client.Jobs().Allocations(jobId, true, nil)
+	return
+}