138 lines
3.4 KiB
Go
138 lines
3.4 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dockerswarm
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import (
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"context"
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"fmt"
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"net/http"
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"net/url"
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"time"
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"github.com/docker/docker/client"
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"github.com/go-kit/kit/log"
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config_util "github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/discovery/refresh"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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)
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const (
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swarmLabel = model.MetaLabelPrefix + "dockerswarm_"
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)
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// DefaultSDConfig is the default Docker Swarm SD configuration.
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var DefaultSDConfig = SDConfig{
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RefreshInterval: model.Duration(60 * time.Second),
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Port: 80,
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}
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// SDConfig is the configuration for Docker Swarm based service discovery.
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type SDConfig struct {
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HTTPClientConfig config_util.HTTPClientConfig `yaml:",inline"`
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Host string `yaml:"host"`
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url *url.URL
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Role string `yaml:"role"`
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Port int `yaml:"port"`
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RefreshInterval model.Duration `yaml:"refresh_interval"`
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
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*c = DefaultSDConfig
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type plain SDConfig
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err := unmarshal((*plain)(c))
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if err != nil {
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return err
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}
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if c.Host == "" {
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return fmt.Errorf("host missing")
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}
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url, err := url.Parse(c.Host)
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if err != nil {
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return err
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}
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c.url = url
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switch c.Role {
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case "services", "nodes", "tasks":
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case "":
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return fmt.Errorf("role missing (one of: tasks, services, nodes)")
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default:
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return fmt.Errorf("invalid role %s, expected tasks, services, or nodes", c.Role)
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}
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return nil
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}
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// Discovery periodically performs Docker Swarm requests. It implements
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// the Discoverer interface.
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type Discovery struct {
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*refresh.Discovery
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client *client.Client
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port int
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}
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// NewDiscovery returns a new Discovery which periodically refreshes its targets.
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func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
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d := &Discovery{
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port: conf.Port,
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}
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rt, err := config_util.NewRoundTripperFromConfig(conf.HTTPClientConfig, "dockerswarm_sd", false)
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if err != nil {
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return nil, err
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}
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// This is used in tests. In normal situations, it is set when Unmarshaling.
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if conf.url == nil {
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conf.url, err = url.Parse(conf.Host)
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if err != nil {
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return nil, err
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}
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}
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d.client, err = client.NewClientWithOpts(
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client.WithHost(conf.Host),
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client.WithHTTPClient(&http.Client{
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Transport: rt,
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Timeout: time.Duration(conf.RefreshInterval),
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}),
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client.WithScheme(conf.url.Scheme),
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client.WithAPIVersionNegotiation(),
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)
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if err != nil {
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return nil, fmt.Errorf("error setting up docker swarm client: %w", err)
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}
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var r func(context.Context) ([]*targetgroup.Group, error)
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switch conf.Role {
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case "services":
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r = d.refreshServices
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case "nodes":
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r = d.refreshNodes
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case "tasks":
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r = d.refreshTasks
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}
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d.Discovery = refresh.NewDiscovery(
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logger,
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"dockerswarm",
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time.Duration(conf.RefreshInterval),
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r,
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)
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return d, nil
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}
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