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tasks.go
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tasks.go
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package dockerswarm
import (
"encoding/json"
"fmt"
"net"
"strconv"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
)
// See https://docs.docker.com/engine/api/v1.40/#tag/Task
type task struct {
ID string
ServiceID string
NodeID string
DesiredState string
NetworksAttachments []struct {
Addresses []string
Network struct {
ID string
}
}
Status struct {
State string
ContainerStatus struct {
ContainerID string
}
PortStatus struct {
Ports []portConfig
}
}
Spec struct {
ContainerSpec struct {
Labels map[string]string
}
}
Slot int
}
func getTasksLabels(cfg *apiConfig) ([]*promutils.Labels, error) {
tasks, err := getTasks(cfg)
if err != nil {
return nil, err
}
services, err := getServices(cfg)
if err != nil {
return nil, err
}
networkLabels, err := getNetworksLabelsByNetworkID(cfg)
if err != nil {
return nil, err
}
svcLabels := addServicesLabels(services, networkLabels, cfg.port)
nodeLabels, err := getNodesLabels(cfg)
if err != nil {
return nil, err
}
return addTasksLabels(tasks, nodeLabels, svcLabels, networkLabels, services, cfg.port), nil
}
func getTasks(cfg *apiConfig) ([]task, error) {
filtersQueryArg := ""
if cfg.role == "tasks" {
filtersQueryArg = cfg.filtersQueryArg
}
resp, err := cfg.getAPIResponse("/tasks", filtersQueryArg)
if err != nil {
return nil, fmt.Errorf("cannot query dockerswarm api for tasks: %w", err)
}
return parseTasks(resp)
}
func parseTasks(data []byte) ([]task, error) {
var tasks []task
if err := json.Unmarshal(data, &tasks); err != nil {
return nil, fmt.Errorf("cannot parse tasks: %w", err)
}
return tasks, nil
}
func addTasksLabels(tasks []task, nodesLabels, servicesLabels []*promutils.Labels, networksLabels map[string]*promutils.Labels, services []service, port int) []*promutils.Labels {
var ms []*promutils.Labels
for _, task := range tasks {
commonLabels := promutils.NewLabels(8)
commonLabels.Add("__meta_dockerswarm_task_id", task.ID)
commonLabels.Add("__meta_dockerswarm_task_container_id", task.Status.ContainerStatus.ContainerID)
commonLabels.Add("__meta_dockerswarm_task_desired_state", task.DesiredState)
commonLabels.Add("__meta_dockerswarm_task_slot", strconv.Itoa(task.Slot))
commonLabels.Add("__meta_dockerswarm_task_state", task.Status.State)
for k, v := range task.Spec.ContainerSpec.Labels {
commonLabels.Add(discoveryutils.SanitizeLabelName("__meta_dockerswarm_container_label_"+k), v)
}
var svcPorts []portConfig
for i, v := range services {
if v.ID == task.ServiceID {
svcPorts = services[i].Endpoint.Ports
break
}
}
addLabels(commonLabels, servicesLabels, "__meta_dockerswarm_service_id", task.ServiceID)
addLabels(commonLabels, nodesLabels, "__meta_dockerswarm_node_id", task.NodeID)
for _, port := range task.Status.PortStatus.Ports {
if port.Protocol != "tcp" {
continue
}
m := promutils.NewLabels(10)
m.AddFrom(commonLabels)
m.Add("__address__", discoveryutils.JoinHostPort(commonLabels.Get("__meta_dockerswarm_node_address"), port.PublishedPort))
m.Add("__meta_dockerswarm_task_port_publish_mode", port.PublishMode)
// Remove possible duplicate labels, which can appear after AddFrom() call
m.RemoveDuplicates()
ms = append(ms, m)
}
for _, na := range task.NetworksAttachments {
networkLabels := networksLabels[na.Network.ID]
for _, address := range na.Addresses {
ip, _, err := net.ParseCIDR(address)
if err != nil {
logger.Errorf("cannot parse task network attachments address: %s as net CIDR: %v", address, err)
continue
}
added := false
for _, ep := range svcPorts {
if ep.Protocol != "tcp" {
continue
}
m := promutils.NewLabels(20)
m.AddFrom(commonLabels)
m.AddFrom(networkLabels)
m.Add("__address__", discoveryutils.JoinHostPort(ip.String(), ep.PublishedPort))
m.Add("__meta_dockerswarm_task_port_publish_mode", ep.PublishMode)
// Remove possible duplicate labels, which can appear after AddFrom() calls
m.RemoveDuplicates()
ms = append(ms, m)
added = true
}
if !added {
m := promutils.NewLabels(20)
m.AddFrom(commonLabels)
m.AddFrom(networkLabels)
m.Add("__address__", discoveryutils.JoinHostPort(ip.String(), port))
// Remove possible duplicate labels, which can appear after AddFrom() calls
m.RemoveDuplicates()
ms = append(ms, m)
}
}
}
}
return ms
}
// addLabels adds labels from src to dst if they contain the given `key: value` pair.
func addLabels(dst *promutils.Labels, src []*promutils.Labels, key, value string) {
for _, m := range src {
if m.Get(key) != value {
continue
}
for _, label := range m.GetLabels() {
dst.Add(label.Name, label.Value)
}
return
}
}