Collect Docker Swarm service metrics in docker input plugin (#3141)

plugins/inputs/docker/docker_testdata.go

@@ -8,6 +8,7 @@ import (
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/registry"
+	"github.com/docker/docker/api/types/swarm"
 )
 
 var info = types.Info{
@@ -133,6 +134,79 @@ var containerList = []types.Container{
 	},
 }
 
+var two = uint64(2)
+var ServiceList = []swarm.Service{
+	swarm.Service{
+		ID: "qolkls9g5iasdiuihcyz9rnx2",
+		Spec: swarm.ServiceSpec{
+			Annotations: swarm.Annotations{
+				Name: "test1",
+			},
+			Mode: swarm.ServiceMode{
+				Replicated: &swarm.ReplicatedService{
+					Replicas: &two,
+				},
+			},
+		},
+	},
+	swarm.Service{
+		ID: "qolkls9g5iasdiuihcyz9rn3",
+		Spec: swarm.ServiceSpec{
+			Annotations: swarm.Annotations{
+				Name: "test2",
+			},
+			Mode: swarm.ServiceMode{
+				Global: &swarm.GlobalService{},
+			},
+		},
+	},
+}
+
+var TaskList = []swarm.Task{
+	swarm.Task{
+		ID:        "kwh0lv7hwwbh",
+		ServiceID: "qolkls9g5iasdiuihcyz9rnx2",
+		NodeID:    "0cl4jturcyd1ks3fwpd010kor",
+		Status: swarm.TaskStatus{
+			State: "running",
+		},
+		DesiredState: "running",
+	},
+	swarm.Task{
+		ID:        "u78m5ojbivc3",
+		ServiceID: "qolkls9g5iasdiuihcyz9rnx2",
+		NodeID:    "0cl4jturcyd1ks3fwpd010kor",
+		Status: swarm.TaskStatus{
+			State: "running",
+		},
+		DesiredState: "running",
+	},
+	swarm.Task{
+		ID:        "1n1uilkhr98l",
+		ServiceID: "qolkls9g5iasdiuihcyz9rn3",
+		NodeID:    "0cl4jturcyd1ks3fwpd010kor",
+		Status: swarm.TaskStatus{
+			State: "running",
+		},
+		DesiredState: "running",
+	},
+}
+
+var NodeList = []swarm.Node{
+	swarm.Node{
+		ID: "0cl4jturcyd1ks3fwpd010kor",
+		Status: swarm.NodeStatus{
+			State: "ready",
+		},
+	},
+	swarm.Node{
+		ID: "0cl4jturcyd1ks3fwpd010kor",
+		Status: swarm.NodeStatus{
+			State: "ready",
+		},
+	},
+}
+
 func containerStats() types.ContainerStats {
 	var stat types.ContainerStats
 	jsonStat := `