Dynamic Configuration Refactoring
This commit is contained in:
Ludovic Fernandez
Traefiker Bot
parent
d3ae88f108
commit
a09dfa3ce1
452 changed files with 21023 additions and 9419 deletions
480
old/provider/docker/docker.go
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480
old/provider/docker/docker.go
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@ -0,0 +1,480 @@
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package docker
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import (
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"context"
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"io"
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"net"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/job"
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"github.com/containous/traefik/old/log"
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"github.com/containous/traefik/old/provider"
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"github.com/containous/traefik/old/types"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/version"
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dockertypes "github.com/docker/docker/api/types"
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dockercontainertypes "github.com/docker/docker/api/types/container"
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eventtypes "github.com/docker/docker/api/types/events"
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"github.com/docker/docker/api/types/filters"
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swarmtypes "github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/api/types/versions"
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"github.com/docker/docker/client"
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"github.com/docker/go-connections/nat"
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"github.com/docker/go-connections/sockets"
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)
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const (
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// SwarmAPIVersion is a constant holding the version of the Provider API traefik will use
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SwarmAPIVersion = "1.24"
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// SwarmDefaultWatchTime is the duration of the interval when polling docker
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SwarmDefaultWatchTime = 15 * time.Second
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)
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var _ provider.Provider = (*Provider)(nil)
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// Provider holds configurations of the provider.
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type Provider struct {
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provider.BaseProvider `mapstructure:",squash" export:"true"`
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Endpoint string `description:"Docker server endpoint. Can be a tcp or a unix socket endpoint"`
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Domain string `description:"Default domain used"`
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TLS *types.ClientTLS `description:"Enable Docker TLS support" export:"true"`
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ExposedByDefault bool `description:"Expose containers by default" export:"true"`
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UseBindPortIP bool `description:"Use the ip address from the bound port, rather than from the inner network" export:"true"`
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SwarmMode bool `description:"Use Docker on Swarm Mode" export:"true"`
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Network string `description:"Default Docker network used" export:"true"`
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}
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// Init the provider
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func (p *Provider) Init(constraints types.Constraints) error {
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return p.BaseProvider.Init(constraints)
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}
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// dockerData holds the need data to the Provider p
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type dockerData struct {
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ServiceName string
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Name string
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Labels map[string]string // List of labels set to container or service
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NetworkSettings networkSettings
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Health string
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Node *dockertypes.ContainerNode
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SegmentLabels map[string]string
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SegmentName string
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}
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// NetworkSettings holds the networks data to the Provider p
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type networkSettings struct {
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NetworkMode dockercontainertypes.NetworkMode
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Ports nat.PortMap
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Networks map[string]*networkData
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}
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// Network holds the network data to the Provider p
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type networkData struct {
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Name string
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Addr string
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Port int
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Protocol string
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ID string
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}
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func (p *Provider) createClient() (client.APIClient, error) {
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var httpClient *http.Client
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if p.TLS != nil {
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config, err := p.TLS.CreateTLSConfig()
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if err != nil {
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return nil, err
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}
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tr := &http.Transport{
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TLSClientConfig: config,
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}
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hostURL, err := client.ParseHostURL(p.Endpoint)
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if err != nil {
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return nil, err
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}
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if err := sockets.ConfigureTransport(tr, hostURL.Scheme, hostURL.Host); err != nil {
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return nil, err
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}
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httpClient = &http.Client{
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Transport: tr,
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}
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}
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httpHeaders := map[string]string{
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"User-Agent": "Traefik " + version.Version,
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}
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var apiVersion string
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if p.SwarmMode {
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apiVersion = SwarmAPIVersion
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} else {
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apiVersion = DockerAPIVersion
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}
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return client.NewClient(p.Endpoint, apiVersion, httpClient, httpHeaders)
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}
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// Provide allows the docker provider to provide configurations to traefik
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// using the given configuration channel.
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func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool) error {
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pool.GoCtx(func(routineCtx context.Context) {
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operation := func() error {
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var err error
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ctx, cancel := context.WithCancel(routineCtx)
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defer cancel()
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dockerClient, err := p.createClient()
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if err != nil {
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log.Errorf("Failed to create a client for docker, error: %s", err)
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return err
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}
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serverVersion, err := dockerClient.ServerVersion(ctx)
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if err != nil {
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log.Errorf("Failed to retrieve information of the docker client and server host: %s", err)
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return err
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}
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log.Debugf("Provider connection established with docker %s (API %s)", serverVersion.Version, serverVersion.APIVersion)
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var dockerDataList []dockerData
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if p.SwarmMode {
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dockerDataList, err = listServices(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list services for docker swarm mode, error %s", err)
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return err
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}
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} else {
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dockerDataList, err = listContainers(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list containers for docker, error %s", err)
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return err
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}
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}
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configuration := p.buildConfiguration(dockerDataList)
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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if p.Watch {
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if p.SwarmMode {
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errChan := make(chan error)
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// TODO: This need to be change. Linked to Swarm events docker/docker#23827
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ticker := time.NewTicker(SwarmDefaultWatchTime)
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pool.GoCtx(func(ctx context.Context) {
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defer close(errChan)
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for {
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select {
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case <-ticker.C:
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services, err := listServices(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list services for docker, error %s", err)
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errChan <- err
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return
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}
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configuration := p.buildConfiguration(services)
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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}
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case <-ctx.Done():
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ticker.Stop()
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return
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}
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}
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})
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if err, ok := <-errChan; ok {
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return err
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}
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// channel closed
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} else {
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f := filters.NewArgs()
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f.Add("type", "container")
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options := dockertypes.EventsOptions{
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Filters: f,
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}
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startStopHandle := func(m eventtypes.Message) {
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log.Debugf("Provider event received %+v", m)
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containers, err := listContainers(ctx, dockerClient)
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if err != nil {
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log.Errorf("Failed to list containers for docker, error %s", err)
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// Call cancel to get out of the monitor
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return
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}
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configuration := p.buildConfiguration(containers)
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: "docker",
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Configuration: configuration,
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}
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}
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}
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eventsc, errc := dockerClient.Events(ctx, options)
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for {
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select {
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case event := <-eventsc:
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if event.Action == "start" ||
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event.Action == "die" ||
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strings.HasPrefix(event.Action, "health_status") {
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startStopHandle(event)
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}
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case err := <-errc:
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if err == io.EOF {
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log.Debug("Provider event stream closed")
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}
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return err
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case <-ctx.Done():
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return nil
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}
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}
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}
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}
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return nil
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}
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notify := func(err error, time time.Duration) {
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log.Errorf("Provider connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), routineCtx), notify)
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if err != nil {
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log.Errorf("Cannot connect to docker server %+v", err)
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}
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})
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return nil
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}
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func listContainers(ctx context.Context, dockerClient client.ContainerAPIClient) ([]dockerData, error) {
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containerList, err := dockerClient.ContainerList(ctx, dockertypes.ContainerListOptions{})
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if err != nil {
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return nil, err
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}
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var containersInspected []dockerData
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// get inspect containers
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for _, container := range containerList {
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dData := inspectContainers(ctx, dockerClient, container.ID)
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if len(dData.Name) > 0 {
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containersInspected = append(containersInspected, dData)
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}
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}
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return containersInspected, nil
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}
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func inspectContainers(ctx context.Context, dockerClient client.ContainerAPIClient, containerID string) dockerData {
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dData := dockerData{}
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containerInspected, err := dockerClient.ContainerInspect(ctx, containerID)
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if err != nil {
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log.Warnf("Failed to inspect container %s, error: %s", containerID, err)
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} else {
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// This condition is here to avoid to have empty IP https://github.com/containous/traefik/issues/2459
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// We register only container which are running
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if containerInspected.ContainerJSONBase != nil && containerInspected.ContainerJSONBase.State != nil && containerInspected.ContainerJSONBase.State.Running {
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dData = parseContainer(containerInspected)
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}
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}
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return dData
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}
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func parseContainer(container dockertypes.ContainerJSON) dockerData {
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dData := dockerData{
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NetworkSettings: networkSettings{},
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}
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if container.ContainerJSONBase != nil {
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dData.Name = container.ContainerJSONBase.Name
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dData.ServiceName = dData.Name // Default ServiceName to be the container's Name.
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dData.Node = container.ContainerJSONBase.Node
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if container.ContainerJSONBase.HostConfig != nil {
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dData.NetworkSettings.NetworkMode = container.ContainerJSONBase.HostConfig.NetworkMode
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}
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if container.State != nil && container.State.Health != nil {
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dData.Health = container.State.Health.Status
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}
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}
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if container.Config != nil && container.Config.Labels != nil {
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dData.Labels = container.Config.Labels
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}
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if container.NetworkSettings != nil {
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if container.NetworkSettings.Ports != nil {
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dData.NetworkSettings.Ports = container.NetworkSettings.Ports
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}
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if container.NetworkSettings.Networks != nil {
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dData.NetworkSettings.Networks = make(map[string]*networkData)
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for name, containerNetwork := range container.NetworkSettings.Networks {
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dData.NetworkSettings.Networks[name] = &networkData{
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ID: containerNetwork.NetworkID,
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Name: name,
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Addr: containerNetwork.IPAddress,
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}
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}
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}
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}
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return dData
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}
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func listServices(ctx context.Context, dockerClient client.APIClient) ([]dockerData, error) {
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serviceList, err := dockerClient.ServiceList(ctx, dockertypes.ServiceListOptions{})
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if err != nil {
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return nil, err
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}
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serverVersion, err := dockerClient.ServerVersion(ctx)
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if err != nil {
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return nil, err
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}
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networkListArgs := filters.NewArgs()
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// https://docs.docker.com/engine/api/v1.29/#tag/Network (Docker 17.06)
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if versions.GreaterThanOrEqualTo(serverVersion.APIVersion, "1.29") {
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networkListArgs.Add("scope", "swarm")
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} else {
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networkListArgs.Add("driver", "overlay")
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}
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networkList, err := dockerClient.NetworkList(ctx, dockertypes.NetworkListOptions{Filters: networkListArgs})
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if err != nil {
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log.Debugf("Failed to network inspect on client for docker, error: %s", err)
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return nil, err
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}
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networkMap := make(map[string]*dockertypes.NetworkResource)
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for _, network := range networkList {
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networkToAdd := network
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networkMap[network.ID] = &networkToAdd
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}
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var dockerDataList []dockerData
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var dockerDataListTasks []dockerData
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for _, service := range serviceList {
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dData := parseService(service, networkMap)
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if isBackendLBSwarm(dData) {
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if len(dData.NetworkSettings.Networks) > 0 {
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dockerDataList = append(dockerDataList, dData)
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}
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} else {
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isGlobalSvc := service.Spec.Mode.Global != nil
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dockerDataListTasks, err = listTasks(ctx, dockerClient, service.ID, dData, networkMap, isGlobalSvc)
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if err != nil {
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log.Warn(err)
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} else {
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dockerDataList = append(dockerDataList, dockerDataListTasks...)
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}
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}
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}
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return dockerDataList, err
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}
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func parseService(service swarmtypes.Service, networkMap map[string]*dockertypes.NetworkResource) dockerData {
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dData := dockerData{
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ServiceName: service.Spec.Annotations.Name,
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Name: service.Spec.Annotations.Name,
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Labels: service.Spec.Annotations.Labels,
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NetworkSettings: networkSettings{},
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}
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if service.Spec.EndpointSpec != nil {
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if service.Spec.EndpointSpec.Mode == swarmtypes.ResolutionModeDNSRR {
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if isBackendLBSwarm(dData) {
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log.Warnf("Ignored %s endpoint-mode not supported, service name: %s. Fallback to Traefik load balancing", swarmtypes.ResolutionModeDNSRR, service.Spec.Annotations.Name)
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}
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} else if service.Spec.EndpointSpec.Mode == swarmtypes.ResolutionModeVIP {
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dData.NetworkSettings.Networks = make(map[string]*networkData)
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for _, virtualIP := range service.Endpoint.VirtualIPs {
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networkService := networkMap[virtualIP.NetworkID]
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if networkService != nil {
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if len(virtualIP.Addr) > 0 {
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ip, _, _ := net.ParseCIDR(virtualIP.Addr)
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network := &networkData{
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Name: networkService.Name,
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ID: virtualIP.NetworkID,
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Addr: ip.String(),
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}
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dData.NetworkSettings.Networks[network.Name] = network
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} else {
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log.Debugf("No virtual IPs found in network %s", virtualIP.NetworkID)
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}
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} else {
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log.Debugf("Network not found, id: %s", virtualIP.NetworkID)
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}
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}
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}
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}
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return dData
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}
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func listTasks(ctx context.Context, dockerClient client.APIClient, serviceID string,
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serviceDockerData dockerData, networkMap map[string]*dockertypes.NetworkResource, isGlobalSvc bool) ([]dockerData, error) {
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serviceIDFilter := filters.NewArgs()
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serviceIDFilter.Add("service", serviceID)
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serviceIDFilter.Add("desired-state", "running")
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taskList, err := dockerClient.TaskList(ctx, dockertypes.TaskListOptions{Filters: serviceIDFilter})
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if err != nil {
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return nil, err
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}
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var dockerDataList []dockerData
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for _, task := range taskList {
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if task.Status.State != swarmtypes.TaskStateRunning {
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continue
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}
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dData := parseTasks(task, serviceDockerData, networkMap, isGlobalSvc)
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if len(dData.NetworkSettings.Networks) > 0 {
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dockerDataList = append(dockerDataList, dData)
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}
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}
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return dockerDataList, err
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}
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func parseTasks(task swarmtypes.Task, serviceDockerData dockerData,
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networkMap map[string]*dockertypes.NetworkResource, isGlobalSvc bool) dockerData {
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dData := dockerData{
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ServiceName: serviceDockerData.Name,
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Name: serviceDockerData.Name + "." + strconv.Itoa(task.Slot),
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Labels: serviceDockerData.Labels,
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NetworkSettings: networkSettings{},
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}
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if isGlobalSvc {
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dData.Name = serviceDockerData.Name + "." + task.ID
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}
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if task.NetworksAttachments != nil {
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dData.NetworkSettings.Networks = make(map[string]*networkData)
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for _, virtualIP := range task.NetworksAttachments {
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if networkService, present := networkMap[virtualIP.Network.ID]; present {
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if len(virtualIP.Addresses) > 0 {
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// Not sure about this next loop - when would a task have multiple IP's for the same network?
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for _, addr := range virtualIP.Addresses {
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ip, _, _ := net.ParseCIDR(addr)
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network := &networkData{
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ID: virtualIP.Network.ID,
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Name: networkService.Name,
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Addr: ip.String(),
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}
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dData.NetworkSettings.Networks[network.Name] = network
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}
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} else {
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log.Debugf("No IP addresses found for network %s", virtualIP.Network.ID)
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}
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}
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}
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}
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return dData
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}
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