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tasks.go
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tasks.go
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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dockerswarm
import (
"context"
"fmt"
"net"
"strconv"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/swarm"
"github.com/prometheus/common/model"
"github.com/adolli/prometheus/discovery/targetgroup"
"github.com/adolli/prometheus/util/strutil"
)
const (
swarmLabelTaskPrefix = swarmLabel + "task_"
swarmLabelTaskID = swarmLabelTaskPrefix + "id"
swarmLabelTaskLabelPrefix = swarmLabelTaskPrefix + "label_"
swarmLabelTaskDesiredState = swarmLabelTaskPrefix + "desired_state"
swarmLabelTaskStatus = swarmLabelTaskPrefix + "state"
swarmLabelTaskContainerID = swarmLabelTaskPrefix + "container_id"
swarmLabelTaskSlot = swarmLabelTaskPrefix + "slot"
swarmLabelTaskPortMode = swarmLabelTaskPrefix + "port_publish_mode"
)
func (d *Discovery) refreshTasks(ctx context.Context) ([]*targetgroup.Group, error) {
tg := &targetgroup.Group{
Source: "DockerSwarm",
}
tasks, err := d.client.TaskList(ctx, types.TaskListOptions{Filters: d.filters})
if err != nil {
return nil, fmt.Errorf("error while listing swarm services: %w", err)
}
serviceLabels, servicePorts, err := d.getServicesLabelsAndPorts(ctx)
if err != nil {
return nil, fmt.Errorf("error while computing services labels and ports: %w", err)
}
nodeLabels, err := d.getNodesLabels(ctx)
if err != nil {
return nil, fmt.Errorf("error while computing nodes labels and ports: %w", err)
}
networkLabels, err := d.getNetworksLabels(ctx)
if err != nil {
return nil, fmt.Errorf("error while computing swarm network labels: %w", err)
}
for _, s := range tasks {
commonLabels := map[string]string{
swarmLabelTaskID: s.ID,
swarmLabelTaskDesiredState: string(s.DesiredState),
swarmLabelTaskStatus: string(s.Status.State),
swarmLabelTaskSlot: strconv.FormatInt(int64(s.Slot), 10),
}
if s.Status.ContainerStatus != nil {
commonLabels[swarmLabelTaskContainerID] = s.Status.ContainerStatus.ContainerID
}
for k, v := range s.Labels {
ln := strutil.SanitizeLabelName(k)
commonLabels[swarmLabelTaskLabelPrefix+ln] = v
}
for k, v := range serviceLabels[s.ServiceID] {
commonLabels[k] = v
}
for k, v := range nodeLabels[s.NodeID] {
commonLabels[k] = v
}
for _, p := range s.Status.PortStatus.Ports {
if p.Protocol != swarm.PortConfigProtocolTCP {
continue
}
labels := model.LabelSet{
swarmLabelTaskPortMode: model.LabelValue(p.PublishMode),
}
for k, v := range commonLabels {
labels[model.LabelName(k)] = model.LabelValue(v)
}
addr := net.JoinHostPort(string(labels[swarmLabelNodeAddress]), strconv.FormatUint(uint64(p.PublishedPort), 10))
labels[model.AddressLabel] = model.LabelValue(addr)
tg.Targets = append(tg.Targets, labels)
}
for _, network := range s.NetworksAttachments {
for _, address := range network.Addresses {
var added bool
ip, _, err := net.ParseCIDR(address)
if err != nil {
return nil, fmt.Errorf("error while parsing address %s: %w", address, err)
}
for _, p := range servicePorts[s.ServiceID] {
if p.Protocol != swarm.PortConfigProtocolTCP {
continue
}
labels := model.LabelSet{
swarmLabelTaskPortMode: model.LabelValue(p.PublishMode),
}
for k, v := range commonLabels {
labels[model.LabelName(k)] = model.LabelValue(v)
}
for k, v := range networkLabels[network.Network.ID] {
labels[model.LabelName(k)] = model.LabelValue(v)
}
addr := net.JoinHostPort(ip.String(), strconv.FormatUint(uint64(p.PublishedPort), 10))
labels[model.AddressLabel] = model.LabelValue(addr)
tg.Targets = append(tg.Targets, labels)
added = true
}
if !added {
labels := model.LabelSet{}
for k, v := range commonLabels {
labels[model.LabelName(k)] = model.LabelValue(v)
}
for k, v := range networkLabels[network.Network.ID] {
labels[model.LabelName(k)] = model.LabelValue(v)
}
addr := net.JoinHostPort(ip.String(), fmt.Sprintf("%d", d.port))
labels[model.AddressLabel] = model.LabelValue(addr)
tg.Targets = append(tg.Targets, labels)
}
}
}
}
return []*targetgroup.Group{tg}, nil
}